drm/i915/fbc: Enable fbc on i865

[linux-2.6-microblaze.git] / drivers / gpu / drm / i915 / display / intel_display.c

/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 */

#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/intel-iommu.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-resv.h>
#include <linux/slab.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_rect.h>

#include "display/intel_crt.h"
#include "display/intel_ddi.h"
#include "display/intel_dp.h"
#include "display/intel_dp_mst.h"
#include "display/intel_dsi.h"
#include "display/intel_dvo.h"
#include "display/intel_gmbus.h"
#include "display/intel_hdmi.h"
#include "display/intel_lvds.h"
#include "display/intel_sdvo.h"
#include "display/intel_tv.h"
#include "display/intel_vdsc.h"

#include "gt/intel_rps.h"

#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_acpi.h"
#include "intel_atomic.h"
#include "intel_atomic_plane.h"
#include "intel_bw.h"
#include "intel_cdclk.h"
#include "intel_color.h"
#include "intel_display_types.h"
#include "intel_dp_link_training.h"
#include "intel_fbc.h"
#include "intel_fbdev.h"
#include "intel_fifo_underrun.h"
#include "intel_frontbuffer.h"
#include "intel_hdcp.h"
#include "intel_hotplug.h"
#include "intel_overlay.h"
#include "intel_pipe_crc.h"
#include "intel_pm.h"
#include "intel_psr.h"
#include "intel_quirks.h"
#include "intel_sideband.h"
#include "intel_sprite.h"
#include "intel_tc.h"
#include "intel_vga.h"

/* Primary plane formats for gen <= 3 */
static const u32 i8xx_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
};

/* Primary plane formats for ivb (no fp16 due to hw issue) */
static const u32 ivb_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB2101010,
        DRM_FORMAT_XBGR2101010,
};

/* Primary plane formats for gen >= 4, except ivb */
static const u32 i965_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB2101010,
        DRM_FORMAT_XBGR2101010,
        DRM_FORMAT_XBGR16161616F,
};

/* Primary plane formats for vlv/chv */
static const u32 vlv_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_XRGB2101010,
        DRM_FORMAT_XBGR2101010,
        DRM_FORMAT_ARGB2101010,
        DRM_FORMAT_ABGR2101010,
        DRM_FORMAT_XBGR16161616F,
};

static const u64 i9xx_format_modifiers[] = {
        I915_FORMAT_MOD_X_TILED,
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID
};

/* Cursor formats */
static const u32 intel_cursor_formats[] = {
        DRM_FORMAT_ARGB8888,
};

static const u64 cursor_format_modifiers[] = {
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID
};

static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config);
static void ilk_pch_clock_get(struct intel_crtc *crtc,
                              struct intel_crtc_state *pipe_config);

static int intel_framebuffer_init(struct intel_framebuffer *ifb,
                                  struct drm_i915_gem_object *obj,
                                  struct drm_mode_fb_cmd2 *mode_cmd);
static void intel_set_pipe_timings(const struct intel_crtc_state *crtc_state);
static void intel_set_pipe_src_size(const struct intel_crtc_state *crtc_state);
static void intel_cpu_transcoder_set_m_n(const struct intel_crtc_state *crtc_state,
                                         const struct intel_link_m_n *m_n,
                                         const struct intel_link_m_n *m2_n2);
static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state);
static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state);
static void hsw_set_pipeconf(const struct intel_crtc_state *crtc_state);
static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state);
static void vlv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config);
static void chv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config);
static void skl_pfit_enable(const struct intel_crtc_state *crtc_state);
static void ilk_pfit_enable(const struct intel_crtc_state *crtc_state);
static void intel_modeset_setup_hw_state(struct drm_device *dev,
                                         struct drm_modeset_acquire_ctx *ctx);
static struct intel_crtc_state *intel_crtc_state_alloc(struct intel_crtc *crtc);

struct intel_limit {
        struct {
                int min, max;
        } dot, vco, n, m, m1, m2, p, p1;

        struct {
                int dot_limit;
                int p2_slow, p2_fast;
        } p2;
};

/* returns HPLL frequency in kHz */
int vlv_get_hpll_vco(struct drm_i915_private *dev_priv)
{
        int hpll_freq, vco_freq[] = { 800, 1600, 2000, 2400 };

        /* Obtain SKU information */
        hpll_freq = vlv_cck_read(dev_priv, CCK_FUSE_REG) &
                CCK_FUSE_HPLL_FREQ_MASK;

        return vco_freq[hpll_freq] * 1000;
}

int vlv_get_cck_clock(struct drm_i915_private *dev_priv,
                      const char *name, u32 reg, int ref_freq)
{
        u32 val;
        int divider;

        val = vlv_cck_read(dev_priv, reg);
        divider = val & CCK_FREQUENCY_VALUES;

        drm_WARN(&dev_priv->drm, (val & CCK_FREQUENCY_STATUS) !=
                 (divider << CCK_FREQUENCY_STATUS_SHIFT),
                 "%s change in progress\n", name);

        return DIV_ROUND_CLOSEST(ref_freq << 1, divider + 1);
}

int vlv_get_cck_clock_hpll(struct drm_i915_private *dev_priv,
                           const char *name, u32 reg)
{
        int hpll;

        vlv_cck_get(dev_priv);

        if (dev_priv->hpll_freq == 0)
                dev_priv->hpll_freq = vlv_get_hpll_vco(dev_priv);

        hpll = vlv_get_cck_clock(dev_priv, name, reg, dev_priv->hpll_freq);

        vlv_cck_put(dev_priv);

        return hpll;
}

static void intel_update_czclk(struct drm_i915_private *dev_priv)
{
        if (!(IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)))
                return;

        dev_priv->czclk_freq = vlv_get_cck_clock_hpll(dev_priv, "czclk",
                                                      CCK_CZ_CLOCK_CONTROL);

        drm_dbg(&dev_priv->drm, "CZ clock rate: %d kHz\n",
                dev_priv->czclk_freq);
}

/* units of 100MHz */
static u32 intel_fdi_link_freq(struct drm_i915_private *dev_priv,
                               const struct intel_crtc_state *pipe_config)
{
        if (HAS_DDI(dev_priv))
                return pipe_config->port_clock; /* SPLL */
        else
                return dev_priv->fdi_pll_freq;
}

static const struct intel_limit intel_limits_i8xx_dac = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 2, .max = 33 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 4, .p2_fast = 2 },
};

static const struct intel_limit intel_limits_i8xx_dvo = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 2, .max = 33 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 4, .p2_fast = 4 },
};

static const struct intel_limit intel_limits_i8xx_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 1, .max = 6 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 14, .p2_fast = 7 },
};

static const struct intel_limit intel_limits_i9xx_sdvo = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1400000, .max = 2800000 },
        .n = { .min = 1, .max = 6 },
        .m = { .min = 70, .max = 120 },
        .m1 = { .min = 8, .max = 18 },
        .m2 = { .min = 3, .max = 7 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 200000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit intel_limits_i9xx_lvds = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1400000, .max = 2800000 },
        .n = { .min = 1, .max = 6 },
        .m = { .min = 70, .max = 120 },
        .m1 = { .min = 8, .max = 18 },
        .m2 = { .min = 3, .max = 7 },
        .p = { .min = 7, .max = 98 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 112000,
                .p2_slow = 14, .p2_fast = 7 },
};


static const struct intel_limit intel_limits_g4x_sdvo = {
        .dot = { .min = 25000, .max = 270000 },
        .vco = { .min = 1750000, .max = 3500000},
        .n = { .min = 1, .max = 4 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 10, .max = 30 },
        .p1 = { .min = 1, .max = 3},
        .p2 = { .dot_limit = 270000,
                .p2_slow = 10,
                .p2_fast = 10
        },
};

static const struct intel_limit intel_limits_g4x_hdmi = {
        .dot = { .min = 22000, .max = 400000 },
        .vco = { .min = 1750000, .max = 3500000},
        .n = { .min = 1, .max = 4 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 16, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8},
        .p2 = { .dot_limit = 165000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit intel_limits_g4x_single_channel_lvds = {
        .dot = { .min = 20000, .max = 115000 },
        .vco = { .min = 1750000, .max = 3500000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 0,
                .p2_slow = 14, .p2_fast = 14
        },
};

static const struct intel_limit intel_limits_g4x_dual_channel_lvds = {
        .dot = { .min = 80000, .max = 224000 },
        .vco = { .min = 1750000, .max = 3500000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 14, .max = 42 },
        .p1 = { .min = 2, .max = 6 },
        .p2 = { .dot_limit = 0,
                .p2_slow = 7, .p2_fast = 7
        },
};

static const struct intel_limit pnv_limits_sdvo = {
        .dot = { .min = 20000, .max = 400000},
        .vco = { .min = 1700000, .max = 3500000 },
        /* Pineview's Ncounter is a ring counter */
        .n = { .min = 3, .max = 6 },
        .m = { .min = 2, .max = 256 },
        /* Pineview only has one combined m divider, which we treat as m2. */
        .m1 = { .min = 0, .max = 0 },
        .m2 = { .min = 0, .max = 254 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 200000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit pnv_limits_lvds = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1700000, .max = 3500000 },
        .n = { .min = 3, .max = 6 },
        .m = { .min = 2, .max = 256 },
        .m1 = { .min = 0, .max = 0 },
        .m2 = { .min = 0, .max = 254 },
        .p = { .min = 7, .max = 112 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 112000,
                .p2_slow = 14, .p2_fast = 14 },
};

/* Ironlake / Sandybridge
 *
 * We calculate clock using (register_value + 2) for N/M1/M2, so here
 * the range value for them is (actual_value - 2).
 */
static const struct intel_limit ilk_limits_dac = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 5 },
        .m = { .min = 79, .max = 127 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit ilk_limits_single_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 118 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 14, .p2_fast = 14 },
};

static const struct intel_limit ilk_limits_dual_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 127 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 14, .max = 56 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 7, .p2_fast = 7 },
};

/* LVDS 100mhz refclk limits. */
static const struct intel_limit ilk_limits_single_lvds_100m = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 2 },
        .m = { .min = 79, .max = 126 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 14, .p2_fast = 14 },
};

static const struct intel_limit ilk_limits_dual_lvds_100m = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 126 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 14, .max = 42 },
        .p1 = { .min = 2, .max = 6 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 7, .p2_fast = 7 },
};

static const struct intel_limit intel_limits_vlv = {
         /*
          * These are the data rate limits (measured in fast clocks)
          * since those are the strictest limits we have. The fast
          * clock and actual rate limits are more relaxed, so checking
          * them would make no difference.
          */
        .dot = { .min = 25000 * 5, .max = 270000 * 5 },
        .vco = { .min = 4000000, .max = 6000000 },
        .n = { .min = 1, .max = 7 },
        .m1 = { .min = 2, .max = 3 },
        .m2 = { .min = 11, .max = 156 },
        .p1 = { .min = 2, .max = 3 },
        .p2 = { .p2_slow = 2, .p2_fast = 20 }, /* slow=min, fast=max */
};

static const struct intel_limit intel_limits_chv = {
        /*
         * These are the data rate limits (measured in fast clocks)
         * since those are the strictest limits we have.  The fast
         * clock and actual rate limits are more relaxed, so checking
         * them would make no difference.
         */
        .dot = { .min = 25000 * 5, .max = 540000 * 5},
        .vco = { .min = 4800000, .max = 6480000 },
        .n = { .min = 1, .max = 1 },
        .m1 = { .min = 2, .max = 2 },
        .m2 = { .min = 24 << 22, .max = 175 << 22 },
        .p1 = { .min = 2, .max = 4 },
        .p2 = { .p2_slow = 1, .p2_fast = 14 },
};

static const struct intel_limit intel_limits_bxt = {
        /* FIXME: find real dot limits */
        .dot = { .min = 0, .max = INT_MAX },
        .vco = { .min = 4800000, .max = 6700000 },
        .n = { .min = 1, .max = 1 },
        .m1 = { .min = 2, .max = 2 },
        /* FIXME: find real m2 limits */
        .m2 = { .min = 2 << 22, .max = 255 << 22 },
        .p1 = { .min = 2, .max = 4 },
        .p2 = { .p2_slow = 1, .p2_fast = 20 },
};

/* WA Display #0827: Gen9:all */
static void
skl_wa_827(struct drm_i915_private *dev_priv, enum pipe pipe, bool enable)
{
        if (enable)
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) | DUPS1_GATING_DIS | DUPS2_GATING_DIS);
        else
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) & ~(DUPS1_GATING_DIS | DUPS2_GATING_DIS));
}

/* Wa_2006604312:icl,ehl */
static void
icl_wa_scalerclkgating(struct drm_i915_private *dev_priv, enum pipe pipe,
                       bool enable)
{
        if (enable)
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) | DPFR_GATING_DIS);
        else
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) & ~DPFR_GATING_DIS);
}

static bool
needs_modeset(const struct intel_crtc_state *state)
{
        return drm_atomic_crtc_needs_modeset(&state->uapi);
}

static bool
is_trans_port_sync_slave(const struct intel_crtc_state *crtc_state)
{
        return crtc_state->master_transcoder != INVALID_TRANSCODER;
}

static bool
is_trans_port_sync_master(const struct intel_crtc_state *crtc_state)
{
        return crtc_state->sync_mode_slaves_mask != 0;
}

bool
is_trans_port_sync_mode(const struct intel_crtc_state *crtc_state)
{
        return is_trans_port_sync_master(crtc_state) ||
                is_trans_port_sync_slave(crtc_state);
}

/*
 * Platform specific helpers to calculate the port PLL loopback- (clock.m),
 * and post-divider (clock.p) values, pre- (clock.vco) and post-divided fast
 * (clock.dot) clock rates. This fast dot clock is fed to the port's IO logic.
 * The helpers' return value is the rate of the clock that is fed to the
 * display engine's pipe which can be the above fast dot clock rate or a
 * divided-down version of it.
 */
/* m1 is reserved as 0 in Pineview, n is a ring counter */
static int pnv_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = clock->m2 + 2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot;
}

static u32 i9xx_dpll_compute_m(struct dpll *dpll)
{
        return 5 * (dpll->m1 + 2) + (dpll->m2 + 2);
}

static int i9xx_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = i9xx_dpll_compute_m(clock);
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n + 2 == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n + 2);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot;
}

static int vlv_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = clock->m1 * clock->m2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot / 5;
}

int chv_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = clock->m1 * clock->m2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST_ULL(mul_u32_u32(refclk, clock->m),
                                           clock->n << 22);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot / 5;
}

/*
 * Returns whether the given set of divisors are valid for a given refclk with
 * the given connectors.
 */
static bool intel_pll_is_valid(struct drm_i915_private *dev_priv,
                               const struct intel_limit *limit,
                               const struct dpll *clock)
{
        if (clock->n < limit->n.min || limit->n.max < clock->n)
                return false;
        if (clock->p1 < limit->p1.min || limit->p1.max < clock->p1)
                return false;
        if (clock->m2 < limit->m2.min || limit->m2.max < clock->m2)
                return false;
        if (clock->m1 < limit->m1.min || limit->m1.max < clock->m1)
                return false;

        if (!IS_PINEVIEW(dev_priv) && !IS_VALLEYVIEW(dev_priv) &&
            !IS_CHERRYVIEW(dev_priv) && !IS_GEN9_LP(dev_priv))
                if (clock->m1 <= clock->m2)
                        return false;

        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv) &&
            !IS_GEN9_LP(dev_priv)) {
                if (clock->p < limit->p.min || limit->p.max < clock->p)
                        return false;
                if (clock->m < limit->m.min || limit->m.max < clock->m)
                        return false;
        }

        if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
                return false;
        /* XXX: We may need to be checking "Dot clock" depending on the multiplier,
         * connector, etc., rather than just a single range.
         */
        if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
                return false;

        return true;
}

static int
i9xx_select_p2_div(const struct intel_limit *limit,
                   const struct intel_crtc_state *crtc_state,
                   int target)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                /*
                 * For LVDS just rely on its current settings for dual-channel.
                 * We haven't figured out how to reliably set up different
                 * single/dual channel state, if we even can.
                 */
                if (intel_is_dual_link_lvds(dev_priv))
                        return limit->p2.p2_fast;
                else
                        return limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        return limit->p2.p2_slow;
                else
                        return limit->p2.p2_fast;
        }
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 *
 * Target and reference clocks are specified in kHz.
 *
 * If match_clock is provided, then best_clock P divider must match the P
 * divider from @match_clock used for LVDS downclocking.
 */
static bool
i9xx_find_best_dpll(const struct intel_limit *limit,
                    struct intel_crtc_state *crtc_state,
                    int target, int refclk, struct dpll *match_clock,
                    struct dpll *best_clock)
{
        struct drm_device *dev = crtc_state->uapi.crtc->dev;
        struct dpll clock;
        int err = target;

        memset(best_clock, 0, sizeof(*best_clock));

        clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
             clock.m1++) {
                for (clock.m2 = limit->m2.min;
                     clock.m2 <= limit->m2.max; clock.m2++) {
                        if (clock.m2 >= clock.m1)
                                break;
                        for (clock.n = limit->n.min;
                             clock.n <= limit->n.max; clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                        clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        i9xx_calc_dpll_params(refclk, &clock);
                                        if (!intel_pll_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;
                                        if (match_clock &&
                                            clock.p != match_clock->p)
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 *
 * Target and reference clocks are specified in kHz.
 *
 * If match_clock is provided, then best_clock P divider must match the P
 * divider from @match_clock used for LVDS downclocking.
 */
static bool
pnv_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct drm_device *dev = crtc_state->uapi.crtc->dev;
        struct dpll clock;
        int err = target;

        memset(best_clock, 0, sizeof(*best_clock));

        clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
             clock.m1++) {
                for (clock.m2 = limit->m2.min;
                     clock.m2 <= limit->m2.max; clock.m2++) {
                        for (clock.n = limit->n.min;
                             clock.n <= limit->n.max; clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                        clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        pnv_calc_dpll_params(refclk, &clock);
                                        if (!intel_pll_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;
                                        if (match_clock &&
                                            clock.p != match_clock->p)
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 *
 * Target and reference clocks are specified in kHz.
 *
 * If match_clock is provided, then best_clock P divider must match the P
 * divider from @match_clock used for LVDS downclocking.
 */
static bool
g4x_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct drm_device *dev = crtc_state->uapi.crtc->dev;
        struct dpll clock;
        int max_n;
        bool found = false;
        /* approximately equals target * 0.00585 */
        int err_most = (target >> 8) + (target >> 9);

        memset(best_clock, 0, sizeof(*best_clock));

        clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);

        max_n = limit->n.max;
        /* based on hardware requirement, prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                /* based on hardware requirement, prefere larger m1,m2 */
                for (clock.m1 = limit->m1.max;
                     clock.m1 >= limit->m1.min; clock.m1--) {
                        for (clock.m2 = limit->m2.max;
                             clock.m2 >= limit->m2.min; clock.m2--) {
                                for (clock.p1 = limit->p1.max;
                                     clock.p1 >= limit->p1.min; clock.p1--) {
                                        int this_err;

                                        i9xx_calc_dpll_params(refclk, &clock);
                                        if (!intel_pll_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err_most) {
                                                *best_clock = clock;
                                                err_most = this_err;
                                                max_n = clock.n;
                                                found = true;
                                        }
                                }
                        }
                }
        }
        return found;
}

/*
 * Check if the calculated PLL configuration is more optimal compared to the
 * best configuration and error found so far. Return the calculated error.
 */
static bool vlv_PLL_is_optimal(struct drm_device *dev, int target_freq,
                               const struct dpll *calculated_clock,
                               const struct dpll *best_clock,
                               unsigned int best_error_ppm,
                               unsigned int *error_ppm)
{
        /*
         * For CHV ignore the error and consider only the P value.
         * Prefer a bigger P value based on HW requirements.
         */
        if (IS_CHERRYVIEW(to_i915(dev))) {
                *error_ppm = 0;

                return calculated_clock->p > best_clock->p;
        }

        if (drm_WARN_ON_ONCE(dev, !target_freq))
                return false;

        *error_ppm = div_u64(1000000ULL *
                                abs(target_freq - calculated_clock->dot),
                             target_freq);
        /*
         * Prefer a better P value over a better (smaller) error if the error
         * is small. Ensure this preference for future configurations too by
         * setting the error to 0.
         */
        if (*error_ppm < 100 && calculated_clock->p > best_clock->p) {
                *error_ppm = 0;

                return true;
        }

        return *error_ppm + 10 < best_error_ppm;
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 */
static bool
vlv_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct dpll clock;
        unsigned int bestppm = 1000000;
        /* min update 19.2 MHz */
        int max_n = min(limit->n.max, refclk / 19200);
        bool found = false;

        target *= 5; /* fast clock */

        memset(best_clock, 0, sizeof(*best_clock));

        /* based on hardware requirement, prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
                        for (clock.p2 = limit->p2.p2_fast; clock.p2 >= limit->p2.p2_slow;
                             clock.p2 -= clock.p2 > 10 ? 2 : 1) {
                                clock.p = clock.p1 * clock.p2;
                                /* based on hardware requirement, prefer bigger m1,m2 values */
                                for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
                                        unsigned int ppm;

                                        clock.m2 = DIV_ROUND_CLOSEST(target * clock.p * clock.n,
                                                                     refclk * clock.m1);

                                        vlv_calc_dpll_params(refclk, &clock);

                                        if (!intel_pll_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;

                                        if (!vlv_PLL_is_optimal(dev, target,
                                                                &clock,
                                                                best_clock,
                                                                bestppm, &ppm))
                                                continue;

                                        *best_clock = clock;
                                        bestppm = ppm;
                                        found = true;
                                }
                        }
                }
        }

        return found;
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 */
static bool
chv_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        unsigned int best_error_ppm;
        struct dpll clock;
        u64 m2;
        int found = false;

        memset(best_clock, 0, sizeof(*best_clock));
        best_error_ppm = 1000000;

        /*
         * Based on hardware doc, the n always set to 1, and m1 always
         * set to 2.  If requires to support 200Mhz refclk, we need to
         * revisit this because n may not 1 anymore.
         */
        clock.n = 1, clock.m1 = 2;
        target *= 5;    /* fast clock */

        for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
                for (clock.p2 = limit->p2.p2_fast;
                                clock.p2 >= limit->p2.p2_slow;
                                clock.p2 -= clock.p2 > 10 ? 2 : 1) {
                        unsigned int error_ppm;

                        clock.p = clock.p1 * clock.p2;

                        m2 = DIV_ROUND_CLOSEST_ULL(mul_u32_u32(target, clock.p * clock.n) << 22,
                                                   refclk * clock.m1);

                        if (m2 > INT_MAX/clock.m1)
                                continue;

                        clock.m2 = m2;

                        chv_calc_dpll_params(refclk, &clock);

                        if (!intel_pll_is_valid(to_i915(dev), limit, &clock))
                                continue;

                        if (!vlv_PLL_is_optimal(dev, target, &clock, best_clock,
                                                best_error_ppm, &error_ppm))
                                continue;

                        *best_clock = clock;
                        best_error_ppm = error_ppm;
                        found = true;
                }
        }

        return found;
}

bool bxt_find_best_dpll(struct intel_crtc_state *crtc_state,
                        struct dpll *best_clock)
{
        int refclk = 100000;
        const struct intel_limit *limit = &intel_limits_bxt;

        return chv_find_best_dpll(limit, crtc_state,
                                  crtc_state->port_clock, refclk,
                                  NULL, best_clock);
}

static bool pipe_scanline_is_moving(struct drm_i915_private *dev_priv,
                                    enum pipe pipe)
{
        i915_reg_t reg = PIPEDSL(pipe);
        u32 line1, line2;
        u32 line_mask;

        if (IS_GEN(dev_priv, 2))
                line_mask = DSL_LINEMASK_GEN2;
        else
                line_mask = DSL_LINEMASK_GEN3;

        line1 = intel_de_read(dev_priv, reg) & line_mask;
        msleep(5);
        line2 = intel_de_read(dev_priv, reg) & line_mask;

        return line1 != line2;
}

static void wait_for_pipe_scanline_moving(struct intel_crtc *crtc, bool state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* Wait for the display line to settle/start moving */
        if (wait_for(pipe_scanline_is_moving(dev_priv, pipe) == state, 100))
                drm_err(&dev_priv->drm,
                        "pipe %c scanline %s wait timed out\n",
                        pipe_name(pipe), onoff(state));
}

static void intel_wait_for_pipe_scanline_stopped(struct intel_crtc *crtc)
{
        wait_for_pipe_scanline_moving(crtc, false);
}

static void intel_wait_for_pipe_scanline_moving(struct intel_crtc *crtc)
{
        wait_for_pipe_scanline_moving(crtc, true);
}

static void
intel_wait_for_pipe_off(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (INTEL_GEN(dev_priv) >= 4) {
                enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
                i915_reg_t reg = PIPECONF(cpu_transcoder);

                /* Wait for the Pipe State to go off */
                if (intel_de_wait_for_clear(dev_priv, reg,
                                            I965_PIPECONF_ACTIVE, 100))
                        drm_WARN(&dev_priv->drm, 1,
                                 "pipe_off wait timed out\n");
        } else {
                intel_wait_for_pipe_scanline_stopped(crtc);
        }
}

/* Only for pre-ILK configs */
void assert_pll(struct drm_i915_private *dev_priv,
                enum pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = intel_de_read(dev_priv, DPLL(pipe));
        cur_state = !!(val & DPLL_VCO_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "PLL state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

/* XXX: the dsi pll is shared between MIPI DSI ports */
void assert_dsi_pll(struct drm_i915_private *dev_priv, bool state)
{
        u32 val;
        bool cur_state;

        vlv_cck_get(dev_priv);
        val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
        vlv_cck_put(dev_priv);

        cur_state = val & DSI_PLL_VCO_EN;
        I915_STATE_WARN(cur_state != state,
             "DSI PLL state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

static void assert_fdi_tx(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        bool cur_state;

        if (HAS_DDI(dev_priv)) {
                /*
                 * DDI does not have a specific FDI_TX register.
                 *
                 * FDI is never fed from EDP transcoder
                 * so pipe->transcoder cast is fine here.
                 */
                enum transcoder cpu_transcoder = (enum transcoder)pipe;
                u32 val = intel_de_read(dev_priv,
                                        TRANS_DDI_FUNC_CTL(cpu_transcoder));
                cur_state = !!(val & TRANS_DDI_FUNC_ENABLE);
        } else {
                u32 val = intel_de_read(dev_priv, FDI_TX_CTL(pipe));
                cur_state = !!(val & FDI_TX_ENABLE);
        }
        I915_STATE_WARN(cur_state != state,
             "FDI TX state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}
#define assert_fdi_tx_enabled(d, p) assert_fdi_tx(d, p, true)
#define assert_fdi_tx_disabled(d, p) assert_fdi_tx(d, p, false)

static void assert_fdi_rx(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = intel_de_read(dev_priv, FDI_RX_CTL(pipe));
        cur_state = !!(val & FDI_RX_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "FDI RX state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}
#define assert_fdi_rx_enabled(d, p) assert_fdi_rx(d, p, true)
#define assert_fdi_rx_disabled(d, p) assert_fdi_rx(d, p, false)

static void assert_fdi_tx_pll_enabled(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        u32 val;

        /* ILK FDI PLL is always enabled */
        if (IS_GEN(dev_priv, 5))
                return;

        /* On Haswell, DDI ports are responsible for the FDI PLL setup */
        if (HAS_DDI(dev_priv))
                return;

        val = intel_de_read(dev_priv, FDI_TX_CTL(pipe));
        I915_STATE_WARN(!(val & FDI_TX_PLL_ENABLE), "FDI TX PLL assertion failure, should be active but is disabled\n");
}

void assert_fdi_rx_pll(struct drm_i915_private *dev_priv,
                       enum pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = intel_de_read(dev_priv, FDI_RX_CTL(pipe));
        cur_state = !!(val & FDI_RX_PLL_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "FDI RX PLL assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

void assert_panel_unlocked(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        i915_reg_t pp_reg;
        u32 val;
        enum pipe panel_pipe = INVALID_PIPE;
        bool locked = true;

        if (drm_WARN_ON(&dev_priv->drm, HAS_DDI(dev_priv)))
                return;

        if (HAS_PCH_SPLIT(dev_priv)) {
                u32 port_sel;

                pp_reg = PP_CONTROL(0);
                port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;

                switch (port_sel) {
                case PANEL_PORT_SELECT_LVDS:
                        intel_lvds_port_enabled(dev_priv, PCH_LVDS, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPA:
                        intel_dp_port_enabled(dev_priv, DP_A, PORT_A, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPC:
                        intel_dp_port_enabled(dev_priv, PCH_DP_C, PORT_C, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPD:
                        intel_dp_port_enabled(dev_priv, PCH_DP_D, PORT_D, &panel_pipe);
                        break;
                default:
                        MISSING_CASE(port_sel);
                        break;
                }
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                /* presumably write lock depends on pipe, not port select */
                pp_reg = PP_CONTROL(pipe);
                panel_pipe = pipe;
        } else {
                u32 port_sel;

                pp_reg = PP_CONTROL(0);
                port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;

                drm_WARN_ON(&dev_priv->drm,
                            port_sel != PANEL_PORT_SELECT_LVDS);
                intel_lvds_port_enabled(dev_priv, LVDS, &panel_pipe);
        }

        val = intel_de_read(dev_priv, pp_reg);
        if (!(val & PANEL_POWER_ON) ||
            ((val & PANEL_UNLOCK_MASK) == PANEL_UNLOCK_REGS))
                locked = false;

        I915_STATE_WARN(panel_pipe == pipe && locked,
             "panel assertion failure, pipe %c regs locked\n",
             pipe_name(pipe));
}

void assert_pipe(struct drm_i915_private *dev_priv,
                 enum transcoder cpu_transcoder, bool state)
{
        bool cur_state;
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                state = true;

        power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (wakeref) {
                u32 val = intel_de_read(dev_priv, PIPECONF(cpu_transcoder));
                cur_state = !!(val & PIPECONF_ENABLE);

                intel_display_power_put(dev_priv, power_domain, wakeref);
        } else {
                cur_state = false;
        }

        I915_STATE_WARN(cur_state != state,
                        "transcoder %s assertion failure (expected %s, current %s)\n",
                        transcoder_name(cpu_transcoder),
                        onoff(state), onoff(cur_state));
}

static void assert_plane(struct intel_plane *plane, bool state)
{
        enum pipe pipe;
        bool cur_state;

        cur_state = plane->get_hw_state(plane, &pipe);

        I915_STATE_WARN(cur_state != state,
                        "%s assertion failure (expected %s, current %s)\n",
                        plane->base.name, onoff(state), onoff(cur_state));
}

#define assert_plane_enabled(p) assert_plane(p, true)
#define assert_plane_disabled(p) assert_plane(p, false)

static void assert_planes_disabled(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_plane *plane;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane)
                assert_plane_disabled(plane);
}

static void assert_vblank_disabled(struct drm_crtc *crtc)
{
        if (I915_STATE_WARN_ON(drm_crtc_vblank_get(crtc) == 0))
                drm_crtc_vblank_put(crtc);
}

void assert_pch_transcoder_disabled(struct drm_i915_private *dev_priv,
                                    enum pipe pipe)
{
        u32 val;
        bool enabled;

        val = intel_de_read(dev_priv, PCH_TRANSCONF(pipe));
        enabled = !!(val & TRANS_ENABLE);
        I915_STATE_WARN(enabled,
             "transcoder assertion failed, should be off on pipe %c but is still active\n",
             pipe_name(pipe));
}

static void assert_pch_dp_disabled(struct drm_i915_private *dev_priv,
                                   enum pipe pipe, enum port port,
                                   i915_reg_t dp_reg)
{
        enum pipe port_pipe;
        bool state;

        state = intel_dp_port_enabled(dev_priv, dp_reg, port, &port_pipe);

        I915_STATE_WARN(state && port_pipe == pipe,
                        "PCH DP %c enabled on transcoder %c, should be disabled\n",
                        port_name(port), pipe_name(pipe));

        I915_STATE_WARN(HAS_PCH_IBX(dev_priv) && !state && port_pipe == PIPE_B,
                        "IBX PCH DP %c still using transcoder B\n",
                        port_name(port));
}

static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
                                     enum pipe pipe, enum port port,
                                     i915_reg_t hdmi_reg)
{
        enum pipe port_pipe;
        bool state;

        state = intel_sdvo_port_enabled(dev_priv, hdmi_reg, &port_pipe);

        I915_STATE_WARN(state && port_pipe == pipe,
                        "PCH HDMI %c enabled on transcoder %c, should be disabled\n",
                        port_name(port), pipe_name(pipe));

        I915_STATE_WARN(HAS_PCH_IBX(dev_priv) && !state && port_pipe == PIPE_B,
                        "IBX PCH HDMI %c still using transcoder B\n",
                        port_name(port));
}

static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        enum pipe port_pipe;

        assert_pch_dp_disabled(dev_priv, pipe, PORT_B, PCH_DP_B);
        assert_pch_dp_disabled(dev_priv, pipe, PORT_C, PCH_DP_C);
        assert_pch_dp_disabled(dev_priv, pipe, PORT_D, PCH_DP_D);

        I915_STATE_WARN(intel_crt_port_enabled(dev_priv, PCH_ADPA, &port_pipe) &&
                        port_pipe == pipe,
                        "PCH VGA enabled on transcoder %c, should be disabled\n",
                        pipe_name(pipe));

        I915_STATE_WARN(intel_lvds_port_enabled(dev_priv, PCH_LVDS, &port_pipe) &&
                        port_pipe == pipe,
                        "PCH LVDS enabled on transcoder %c, should be disabled\n",
                        pipe_name(pipe));

        /* PCH SDVOB multiplex with HDMIB */
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_B, PCH_HDMIB);
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_C, PCH_HDMIC);
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_D, PCH_HDMID);
}

static void _vlv_enable_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        intel_de_write(dev_priv, DPLL(pipe), pipe_config->dpll_hw_state.dpll);
        intel_de_posting_read(dev_priv, DPLL(pipe));
        udelay(150);

        if (intel_de_wait_for_set(dev_priv, DPLL(pipe), DPLL_LOCK_VLV, 1))
                drm_err(&dev_priv->drm, "DPLL %d failed to lock\n", pipe);
}

static void vlv_enable_pll(struct intel_crtc *crtc,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        assert_pipe_disabled(dev_priv, pipe_config->cpu_transcoder);

        /* PLL is protected by panel, make sure we can write it */
        assert_panel_unlocked(dev_priv, pipe);

        if (pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE)
                _vlv_enable_pll(crtc, pipe_config);

        intel_de_write(dev_priv, DPLL_MD(pipe),
                       pipe_config->dpll_hw_state.dpll_md);
        intel_de_posting_read(dev_priv, DPLL_MD(pipe));
}


static void _chv_enable_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 tmp;

        vlv_dpio_get(dev_priv);

        /* Enable back the 10bit clock to display controller */
        tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
        tmp |= DPIO_DCLKP_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), tmp);

        vlv_dpio_put(dev_priv);

        /*
         * Need to wait > 100ns between dclkp clock enable bit and PLL enable.
         */
        udelay(1);

        /* Enable PLL */
        intel_de_write(dev_priv, DPLL(pipe), pipe_config->dpll_hw_state.dpll);

        /* Check PLL is locked */
        if (intel_de_wait_for_set(dev_priv, DPLL(pipe), DPLL_LOCK_VLV, 1))
                drm_err(&dev_priv->drm, "PLL %d failed to lock\n", pipe);
}

static void chv_enable_pll(struct intel_crtc *crtc,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        assert_pipe_disabled(dev_priv, pipe_config->cpu_transcoder);

        /* PLL is protected by panel, make sure we can write it */
        assert_panel_unlocked(dev_priv, pipe);

        if (pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE)
                _chv_enable_pll(crtc, pipe_config);

        if (pipe != PIPE_A) {
                /*
                 * WaPixelRepeatModeFixForC0:chv
                 *
                 * DPLLCMD is AWOL. Use chicken bits to propagate
                 * the value from DPLLBMD to either pipe B or C.
                 */
                intel_de_write(dev_priv, CBR4_VLV, CBR_DPLLBMD_PIPE(pipe));
                intel_de_write(dev_priv, DPLL_MD(PIPE_B),
                               pipe_config->dpll_hw_state.dpll_md);
                intel_de_write(dev_priv, CBR4_VLV, 0);
                dev_priv->chv_dpll_md[pipe] = pipe_config->dpll_hw_state.dpll_md;

                /*
                 * DPLLB VGA mode also seems to cause problems.
                 * We should always have it disabled.
                 */
                drm_WARN_ON(&dev_priv->drm,
                            (intel_de_read(dev_priv, DPLL(PIPE_B)) &
                             DPLL_VGA_MODE_DIS) == 0);
        } else {
                intel_de_write(dev_priv, DPLL_MD(pipe),
                               pipe_config->dpll_hw_state.dpll_md);
                intel_de_posting_read(dev_priv, DPLL_MD(pipe));
        }
}

static bool i9xx_has_pps(struct drm_i915_private *dev_priv)
{
        if (IS_I830(dev_priv))
                return false;

        return IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv);
}

static void i9xx_enable_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        i915_reg_t reg = DPLL(crtc->pipe);
        u32 dpll = crtc_state->dpll_hw_state.dpll;
        int i;

        assert_pipe_disabled(dev_priv, crtc_state->cpu_transcoder);

        /* PLL is protected by panel, make sure we can write it */
        if (i9xx_has_pps(dev_priv))
                assert_panel_unlocked(dev_priv, crtc->pipe);

        /*
         * Apparently we need to have VGA mode enabled prior to changing
         * the P1/P2 dividers. Otherwise the DPLL will keep using the old
         * dividers, even though the register value does change.
         */
        intel_de_write(dev_priv, reg, dpll & ~DPLL_VGA_MODE_DIS);
        intel_de_write(dev_priv, reg, dpll);

        /* Wait for the clocks to stabilize. */
        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        if (INTEL_GEN(dev_priv) >= 4) {
                intel_de_write(dev_priv, DPLL_MD(crtc->pipe),
                               crtc_state->dpll_hw_state.dpll_md);
        } else {
                /* The pixel multiplier can only be updated once the
                 * DPLL is enabled and the clocks are stable.
                 *
                 * So write it again.
                 */
                intel_de_write(dev_priv, reg, dpll);
        }

        /* We do this three times for luck */
        for (i = 0; i < 3; i++) {
                intel_de_write(dev_priv, reg, dpll);
                intel_de_posting_read(dev_priv, reg);
                udelay(150); /* wait for warmup */
        }
}

static void i9xx_disable_pll(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* Don't disable pipe or pipe PLLs if needed */
        if (IS_I830(dev_priv))
                return;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, crtc_state->cpu_transcoder);

        intel_de_write(dev_priv, DPLL(pipe), DPLL_VGA_MODE_DIS);
        intel_de_posting_read(dev_priv, DPLL(pipe));
}

static void vlv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        u32 val;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, (enum transcoder)pipe);

        val = DPLL_INTEGRATED_REF_CLK_VLV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (pipe != PIPE_A)
                val |= DPLL_INTEGRATED_CRI_CLK_VLV;

        intel_de_write(dev_priv, DPLL(pipe), val);
        intel_de_posting_read(dev_priv, DPLL(pipe));
}

static void chv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 val;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, (enum transcoder)pipe);

        val = DPLL_SSC_REF_CLK_CHV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (pipe != PIPE_A)
                val |= DPLL_INTEGRATED_CRI_CLK_VLV;

        intel_de_write(dev_priv, DPLL(pipe), val);
        intel_de_posting_read(dev_priv, DPLL(pipe));

        vlv_dpio_get(dev_priv);

        /* Disable 10bit clock to display controller */
        val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
        val &= ~DPIO_DCLKP_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), val);

        vlv_dpio_put(dev_priv);
}

void vlv_wait_port_ready(struct drm_i915_private *dev_priv,
                         struct intel_digital_port *dig_port,
                         unsigned int expected_mask)
{
        u32 port_mask;
        i915_reg_t dpll_reg;

        switch (dig_port->base.port) {
        case PORT_B:
                port_mask = DPLL_PORTB_READY_MASK;
                dpll_reg = DPLL(0);
                break;
        case PORT_C:
                port_mask = DPLL_PORTC_READY_MASK;
                dpll_reg = DPLL(0);
                expected_mask <<= 4;
                break;
        case PORT_D:
                port_mask = DPLL_PORTD_READY_MASK;
                dpll_reg = DPIO_PHY_STATUS;
                break;
        default:
                BUG();
        }

        if (intel_de_wait_for_register(dev_priv, dpll_reg,
                                       port_mask, expected_mask, 1000))
                drm_WARN(&dev_priv->drm, 1,
                         "timed out waiting for [ENCODER:%d:%s] port ready: got 0x%x, expected 0x%x\n",
                         dig_port->base.base.base.id, dig_port->base.base.name,
                         intel_de_read(dev_priv, dpll_reg) & port_mask,
                         expected_mask);
}

static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val, pipeconf_val;

        /* Make sure PCH DPLL is enabled */
        assert_shared_dpll_enabled(dev_priv, crtc_state->shared_dpll);

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, pipe);
        assert_fdi_rx_enabled(dev_priv, pipe);

        if (HAS_PCH_CPT(dev_priv)) {
                reg = TRANS_CHICKEN2(pipe);
                val = intel_de_read(dev_priv, reg);
                /*
                 * Workaround: Set the timing override bit
                 * before enabling the pch transcoder.
                 */
                val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
                /* Configure frame start delay to match the CPU */
                val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
                val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
                intel_de_write(dev_priv, reg, val);
        }

        reg = PCH_TRANSCONF(pipe);
        val = intel_de_read(dev_priv, reg);
        pipeconf_val = intel_de_read(dev_priv, PIPECONF(pipe));

        if (HAS_PCH_IBX(dev_priv)) {
                /* Configure frame start delay to match the CPU */
                val &= ~TRANS_FRAME_START_DELAY_MASK;
                val |= TRANS_FRAME_START_DELAY(0);

                /*
                 * Make the BPC in transcoder be consistent with
                 * that in pipeconf reg. For HDMI we must use 8bpc
                 * here for both 8bpc and 12bpc.
                 */
                val &= ~PIPECONF_BPC_MASK;
                if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
                        val |= PIPECONF_8BPC;
                else
                        val |= pipeconf_val & PIPECONF_BPC_MASK;
        }

        val &= ~TRANS_INTERLACE_MASK;
        if ((pipeconf_val & PIPECONF_INTERLACE_MASK) == PIPECONF_INTERLACED_ILK) {
                if (HAS_PCH_IBX(dev_priv) &&
                    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                        val |= TRANS_LEGACY_INTERLACED_ILK;
                else
                        val |= TRANS_INTERLACED;
        } else {
                val |= TRANS_PROGRESSIVE;
        }

        intel_de_write(dev_priv, reg, val | TRANS_ENABLE);
        if (intel_de_wait_for_set(dev_priv, reg, TRANS_STATE_ENABLE, 100))
                drm_err(&dev_priv->drm, "failed to enable transcoder %c\n",
                        pipe_name(pipe));
}

static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
                                      enum transcoder cpu_transcoder)
{
        u32 val, pipeconf_val;

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, (enum pipe) cpu_transcoder);
        assert_fdi_rx_enabled(dev_priv, PIPE_A);

        val = intel_de_read(dev_priv, TRANS_CHICKEN2(PIPE_A));
        /* Workaround: set timing override bit. */
        val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
        /* Configure frame start delay to match the CPU */
        val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
        val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
        intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);

        val = TRANS_ENABLE;
        pipeconf_val = intel_de_read(dev_priv, PIPECONF(cpu_transcoder));

        if ((pipeconf_val & PIPECONF_INTERLACE_MASK_HSW) ==
            PIPECONF_INTERLACED_ILK)
                val |= TRANS_INTERLACED;
        else
                val |= TRANS_PROGRESSIVE;

        intel_de_write(dev_priv, LPT_TRANSCONF, val);
        if (intel_de_wait_for_set(dev_priv, LPT_TRANSCONF,
                                  TRANS_STATE_ENABLE, 100))
                drm_err(&dev_priv->drm, "Failed to enable PCH transcoder\n");
}

static void ilk_disable_pch_transcoder(struct drm_i915_private *dev_priv,
                                       enum pipe pipe)
{
        i915_reg_t reg;
        u32 val;

        /* FDI relies on the transcoder */
        assert_fdi_tx_disabled(dev_priv, pipe);
        assert_fdi_rx_disabled(dev_priv, pipe);

        /* Ports must be off as well */
        assert_pch_ports_disabled(dev_priv, pipe);

        reg = PCH_TRANSCONF(pipe);
        val = intel_de_read(dev_priv, reg);
        val &= ~TRANS_ENABLE;
        intel_de_write(dev_priv, reg, val);
        /* wait for PCH transcoder off, transcoder state */
        if (intel_de_wait_for_clear(dev_priv, reg, TRANS_STATE_ENABLE, 50))
                drm_err(&dev_priv->drm, "failed to disable transcoder %c\n",
                        pipe_name(pipe));

        if (HAS_PCH_CPT(dev_priv)) {
                /* Workaround: Clear the timing override chicken bit again. */
                reg = TRANS_CHICKEN2(pipe);
                val = intel_de_read(dev_priv, reg);
                val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
                intel_de_write(dev_priv, reg, val);
        }
}

void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = intel_de_read(dev_priv, LPT_TRANSCONF);
        val &= ~TRANS_ENABLE;
        intel_de_write(dev_priv, LPT_TRANSCONF, val);
        /* wait for PCH transcoder off, transcoder state */
        if (intel_de_wait_for_clear(dev_priv, LPT_TRANSCONF,
                                    TRANS_STATE_ENABLE, 50))
                drm_err(&dev_priv->drm, "Failed to disable PCH transcoder\n");

        /* Workaround: clear timing override bit. */
        val = intel_de_read(dev_priv, TRANS_CHICKEN2(PIPE_A));
        val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
        intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
}

enum pipe intel_crtc_pch_transcoder(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (HAS_PCH_LPT(dev_priv))
                return PIPE_A;
        else
                return crtc->pipe;
}

static u32 intel_crtc_max_vblank_count(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        /*
         * On i965gm the hardware frame counter reads
         * zero when the TV encoder is enabled :(
         */
        if (IS_I965GM(dev_priv) &&
            (crtc_state->output_types & BIT(INTEL_OUTPUT_TVOUT)))
                return 0;

        if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                return 0xffffffff; /* full 32 bit counter */
        else if (INTEL_GEN(dev_priv) >= 3)
                return 0xffffff; /* only 24 bits of frame count */
        else
                return 0; /* Gen2 doesn't have a hardware frame counter */
}

void intel_crtc_vblank_on(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);

        assert_vblank_disabled(&crtc->base);
        drm_crtc_set_max_vblank_count(&crtc->base,
                                      intel_crtc_max_vblank_count(crtc_state));
        drm_crtc_vblank_on(&crtc->base);
}

void intel_crtc_vblank_off(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);

        drm_crtc_vblank_off(&crtc->base);
        assert_vblank_disabled(&crtc->base);
}

void intel_enable_pipe(const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val;

        drm_dbg_kms(&dev_priv->drm, "enabling pipe %c\n", pipe_name(pipe));

        assert_planes_disabled(crtc);

        /*
         * A pipe without a PLL won't actually be able to drive bits from
         * a plane.  On ILK+ the pipe PLLs are integrated, so we don't
         * need the check.
         */
        if (HAS_GMCH(dev_priv)) {
                if (intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI))
                        assert_dsi_pll_enabled(dev_priv);
                else
                        assert_pll_enabled(dev_priv, pipe);
        } else {
                if (new_crtc_state->has_pch_encoder) {
                        /* if driving the PCH, we need FDI enabled */
                        assert_fdi_rx_pll_enabled(dev_priv,
                                                  intel_crtc_pch_transcoder(crtc));
                        assert_fdi_tx_pll_enabled(dev_priv,
                                                  (enum pipe) cpu_transcoder);
                }
                /* FIXME: assert CPU port conditions for SNB+ */
        }

        trace_intel_pipe_enable(crtc);

        reg = PIPECONF(cpu_transcoder);
        val = intel_de_read(dev_priv, reg);
        if (val & PIPECONF_ENABLE) {
                /* we keep both pipes enabled on 830 */
                drm_WARN_ON(&dev_priv->drm, !IS_I830(dev_priv));
                return;
        }

        intel_de_write(dev_priv, reg, val | PIPECONF_ENABLE);
        intel_de_posting_read(dev_priv, reg);

        /*
         * Until the pipe starts PIPEDSL reads will return a stale value,
         * which causes an apparent vblank timestamp jump when PIPEDSL
         * resets to its proper value. That also messes up the frame count
         * when it's derived from the timestamps. So let's wait for the
         * pipe to start properly before we call drm_crtc_vblank_on()
         */
        if (intel_crtc_max_vblank_count(new_crtc_state) == 0)
                intel_wait_for_pipe_scanline_moving(crtc);
}

void intel_disable_pipe(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val;

        drm_dbg_kms(&dev_priv->drm, "disabling pipe %c\n", pipe_name(pipe));

        /*
         * Make sure planes won't keep trying to pump pixels to us,
         * or we might hang the display.
         */
        assert_planes_disabled(crtc);

        trace_intel_pipe_disable(crtc);

        reg = PIPECONF(cpu_transcoder);
        val = intel_de_read(dev_priv, reg);
        if ((val & PIPECONF_ENABLE) == 0)
                return;

        /*
         * Double wide has implications for planes
         * so best keep it disabled when not needed.
         */
        if (old_crtc_state->double_wide)
                val &= ~PIPECONF_DOUBLE_WIDE;

        /* Don't disable pipe or pipe PLLs if needed */
        if (!IS_I830(dev_priv))
                val &= ~PIPECONF_ENABLE;

        intel_de_write(dev_priv, reg, val);
        if ((val & PIPECONF_ENABLE) == 0)
                intel_wait_for_pipe_off(old_crtc_state);
}

static unsigned int intel_tile_size(const struct drm_i915_private *dev_priv)
{
        return IS_GEN(dev_priv, 2) ? 2048 : 4096;
}

static bool is_ccs_plane(const struct drm_framebuffer *fb, int plane)
{
        if (!is_ccs_modifier(fb->modifier))
                return false;

        return plane >= fb->format->num_planes / 2;
}

static bool is_gen12_ccs_modifier(u64 modifier)
{
        return modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS ||
               modifier == I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS;

}

static bool is_gen12_ccs_plane(const struct drm_framebuffer *fb, int plane)
{
        return is_gen12_ccs_modifier(fb->modifier) && is_ccs_plane(fb, plane);
}

static bool is_aux_plane(const struct drm_framebuffer *fb, int plane)
{
        if (is_ccs_modifier(fb->modifier))
                return is_ccs_plane(fb, plane);

        return plane == 1;
}

static int main_to_ccs_plane(const struct drm_framebuffer *fb, int main_plane)
{
        drm_WARN_ON(fb->dev, !is_ccs_modifier(fb->modifier) ||
                    (main_plane && main_plane >= fb->format->num_planes / 2));

        return fb->format->num_planes / 2 + main_plane;
}

static int ccs_to_main_plane(const struct drm_framebuffer *fb, int ccs_plane)
{
        drm_WARN_ON(fb->dev, !is_ccs_modifier(fb->modifier) ||
                    ccs_plane < fb->format->num_planes / 2);

        return ccs_plane - fb->format->num_planes / 2;
}

/* Return either the main plane's CCS or - if not a CCS FB - UV plane */
int intel_main_to_aux_plane(const struct drm_framebuffer *fb, int main_plane)
{
        if (is_ccs_modifier(fb->modifier))
                return main_to_ccs_plane(fb, main_plane);

        return 1;
}

bool
intel_format_info_is_yuv_semiplanar(const struct drm_format_info *info,
                                    uint64_t modifier)
{
        return info->is_yuv &&
               info->num_planes == (is_ccs_modifier(modifier) ? 4 : 2);
}

static bool is_semiplanar_uv_plane(const struct drm_framebuffer *fb,
                                   int color_plane)
{
        return intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier) &&
               color_plane == 1;
}

static unsigned int
intel_tile_width_bytes(const struct drm_framebuffer *fb, int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);
        unsigned int cpp = fb->format->cpp[color_plane];

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
                return intel_tile_size(dev_priv);
        case I915_FORMAT_MOD_X_TILED:
                if (IS_GEN(dev_priv, 2))
                        return 128;
                else
                        return 512;
        case I915_FORMAT_MOD_Y_TILED_CCS:
                if (is_ccs_plane(fb, color_plane))
                        return 128;
                /* fall through */
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                if (is_ccs_plane(fb, color_plane))
                        return 64;
                /* fall through */
        case I915_FORMAT_MOD_Y_TILED:
                if (IS_GEN(dev_priv, 2) || HAS_128_BYTE_Y_TILING(dev_priv))
                        return 128;
                else
                        return 512;
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                if (is_ccs_plane(fb, color_plane))
                        return 128;
                /* fall through */
        case I915_FORMAT_MOD_Yf_TILED:
                switch (cpp) {
                case 1:
                        return 64;
                case 2:
                case 4:
                        return 128;
                case 8:
                case 16:
                        return 256;
                default:
                        MISSING_CASE(cpp);
                        return cpp;
                }
                break;
        default:
                MISSING_CASE(fb->modifier);
                return cpp;
        }
}

static unsigned int
intel_tile_height(const struct drm_framebuffer *fb, int color_plane)
{
        if (is_gen12_ccs_plane(fb, color_plane))
                return 1;

        return intel_tile_size(to_i915(fb->dev)) /
                intel_tile_width_bytes(fb, color_plane);
}

/* Return the tile dimensions in pixel units */
static void intel_tile_dims(const struct drm_framebuffer *fb, int color_plane,
                            unsigned int *tile_width,
                            unsigned int *tile_height)
{
        unsigned int tile_width_bytes = intel_tile_width_bytes(fb, color_plane);
        unsigned int cpp = fb->format->cpp[color_plane];

        *tile_width = tile_width_bytes / cpp;
        *tile_height = intel_tile_height(fb, color_plane);
}

static unsigned int intel_tile_row_size(const struct drm_framebuffer *fb,
                                        int color_plane)
{
        unsigned int tile_width, tile_height;

        intel_tile_dims(fb, color_plane, &tile_width, &tile_height);

        return fb->pitches[color_plane] * tile_height;
}

unsigned int
intel_fb_align_height(const struct drm_framebuffer *fb,
                      int color_plane, unsigned int height)
{
        unsigned int tile_height = intel_tile_height(fb, color_plane);

        return ALIGN(height, tile_height);
}

unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info)
{
        unsigned int size = 0;
        int i;

        for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
                size += rot_info->plane[i].width * rot_info->plane[i].height;

        return size;
}

unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info)
{
        unsigned int size = 0;
        int i;

        for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++)
                size += rem_info->plane[i].width * rem_info->plane[i].height;

        return size;
}

static void
intel_fill_fb_ggtt_view(struct i915_ggtt_view *view,
                        const struct drm_framebuffer *fb,
                        unsigned int rotation)
{
        view->type = I915_GGTT_VIEW_NORMAL;
        if (drm_rotation_90_or_270(rotation)) {
                view->type = I915_GGTT_VIEW_ROTATED;
                view->rotated = to_intel_framebuffer(fb)->rot_info;
        }
}

static unsigned int intel_cursor_alignment(const struct drm_i915_private *dev_priv)
{
        if (IS_I830(dev_priv))
                return 16 * 1024;
        else if (IS_I85X(dev_priv))
                return 256;
        else if (IS_I845G(dev_priv) || IS_I865G(dev_priv))
                return 32;
        else
                return 4 * 1024;
}

static unsigned int intel_linear_alignment(const struct drm_i915_private *dev_priv)
{
        if (INTEL_GEN(dev_priv) >= 9)
                return 256 * 1024;
        else if (IS_I965G(dev_priv) || IS_I965GM(dev_priv) ||
                 IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                return 128 * 1024;
        else if (INTEL_GEN(dev_priv) >= 4)
                return 4 * 1024;
        else
                return 0;
}

static unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
                                         int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);

        /* AUX_DIST needs only 4K alignment */
        if ((INTEL_GEN(dev_priv) < 12 && is_aux_plane(fb, color_plane)) ||
            is_ccs_plane(fb, color_plane))
                return 4096;

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
                return intel_linear_alignment(dev_priv);
        case I915_FORMAT_MOD_X_TILED:
                if (INTEL_GEN(dev_priv) >= 9)
                        return 256 * 1024;
                return 0;
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                if (is_semiplanar_uv_plane(fb, color_plane))
                        return intel_tile_row_size(fb, color_plane);
                /* Fall-through */
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
                return 16 * 1024;
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
        case I915_FORMAT_MOD_Y_TILED:
                if (INTEL_GEN(dev_priv) >= 12 &&
                    is_semiplanar_uv_plane(fb, color_plane))
                        return intel_tile_row_size(fb, color_plane);
                /* Fall-through */
        case I915_FORMAT_MOD_Yf_TILED:
                return 1 * 1024 * 1024;
        default:
                MISSING_CASE(fb->modifier);
                return 0;
        }
}

static bool intel_plane_uses_fence(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);

        return INTEL_GEN(dev_priv) < 4 ||
                (plane->has_fbc &&
                 plane_state->view.type == I915_GGTT_VIEW_NORMAL);
}

struct i915_vma *
intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
                           const struct i915_ggtt_view *view,
                           bool uses_fence,
                           unsigned long *out_flags)
{
        struct drm_device *dev = fb->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        intel_wakeref_t wakeref;
        struct i915_vma *vma;
        unsigned int pinctl;
        u32 alignment;

        if (drm_WARN_ON(dev, !i915_gem_object_is_framebuffer(obj)))
                return ERR_PTR(-EINVAL);

        alignment = intel_surf_alignment(fb, 0);
        if (drm_WARN_ON(dev, alignment && !is_power_of_2(alignment)))
                return ERR_PTR(-EINVAL);

        /* Note that the w/a also requires 64 PTE of padding following the
         * bo. We currently fill all unused PTE with the shadow page and so
         * we should always have valid PTE following the scanout preventing
         * the VT-d warning.
         */
        if (intel_scanout_needs_vtd_wa(dev_priv) && alignment < 256 * 1024)
                alignment = 256 * 1024;

        /*
         * Global gtt pte registers are special registers which actually forward
         * writes to a chunk of system memory. Which means that there is no risk
         * that the register values disappear as soon as we call
         * intel_runtime_pm_put(), so it is correct to wrap only the
         * pin/unpin/fence and not more.
         */
        wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

        atomic_inc(&dev_priv->gpu_error.pending_fb_pin);

        /*
         * Valleyview is definitely limited to scanning out the first
         * 512MiB. Lets presume this behaviour was inherited from the
         * g4x display engine and that all earlier gen are similarly
         * limited. Testing suggests that it is a little more
         * complicated than this. For example, Cherryview appears quite
         * happy to scanout from anywhere within its global aperture.
         */
        pinctl = 0;
        if (HAS_GMCH(dev_priv))
                pinctl |= PIN_MAPPABLE;

        vma = i915_gem_object_pin_to_display_plane(obj,
                                                   alignment, view, pinctl);
        if (IS_ERR(vma))
                goto err;

        if (uses_fence && i915_vma_is_map_and_fenceable(vma)) {
                int ret;

                /*
                 * Install a fence for tiled scan-out. Pre-i965 always needs a
                 * fence, whereas 965+ only requires a fence if using
                 * framebuffer compression.  For simplicity, we always, when
                 * possible, install a fence as the cost is not that onerous.
                 *
                 * If we fail to fence the tiled scanout, then either the
                 * modeset will reject the change (which is highly unlikely as
                 * the affected systems, all but one, do not have unmappable
                 * space) or we will not be able to enable full powersaving
                 * techniques (also likely not to apply due to various limits
                 * FBC and the like impose on the size of the buffer, which
                 * presumably we violated anyway with this unmappable buffer).
                 * Anyway, it is presumably better to stumble onwards with
                 * something and try to run the system in a "less than optimal"
                 * mode that matches the user configuration.
                 */
                ret = i915_vma_pin_fence(vma);
                if (ret != 0 && INTEL_GEN(dev_priv) < 4) {
                        i915_gem_object_unpin_from_display_plane(vma);
                        vma = ERR_PTR(ret);
                        goto err;
                }

                if (ret == 0 && vma->fence)
                        *out_flags |= PLANE_HAS_FENCE;
        }

        i915_vma_get(vma);
err:
        atomic_dec(&dev_priv->gpu_error.pending_fb_pin);
        intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
        return vma;
}

void intel_unpin_fb_vma(struct i915_vma *vma, unsigned long flags)
{
        i915_gem_object_lock(vma->obj);
        if (flags & PLANE_HAS_FENCE)
                i915_vma_unpin_fence(vma);
        i915_gem_object_unpin_from_display_plane(vma);
        i915_gem_object_unlock(vma->obj);

        i915_vma_put(vma);
}

static int intel_fb_pitch(const struct drm_framebuffer *fb, int color_plane,
                          unsigned int rotation)
{
        if (drm_rotation_90_or_270(rotation))
                return to_intel_framebuffer(fb)->rotated[color_plane].pitch;
        else
                return fb->pitches[color_plane];
}

/*
 * Convert the x/y offsets into a linear offset.
 * Only valid with 0/180 degree rotation, which is fine since linear
 * offset is only used with linear buffers on pre-hsw and tiled buffers
 * with gen2/3, and 90/270 degree rotations isn't supported on any of them.
 */
u32 intel_fb_xy_to_linear(int x, int y,
                          const struct intel_plane_state *state,
                          int color_plane)
{
        const struct drm_framebuffer *fb = state->hw.fb;
        unsigned int cpp = fb->format->cpp[color_plane];
        unsigned int pitch = state->color_plane[color_plane].stride;

        return y * pitch + x * cpp;
}

/*
 * Add the x/y offsets derived from fb->offsets[] to the user
 * specified plane src x/y offsets. The resulting x/y offsets
 * specify the start of scanout from the beginning of the gtt mapping.
 */
void intel_add_fb_offsets(int *x, int *y,
                          const struct intel_plane_state *state,
                          int color_plane)

{
        *x += state->color_plane[color_plane].x;
        *y += state->color_plane[color_plane].y;
}

static u32 intel_adjust_tile_offset(int *x, int *y,
                                    unsigned int tile_width,
                                    unsigned int tile_height,
                                    unsigned int tile_size,
                                    unsigned int pitch_tiles,
                                    u32 old_offset,
                                    u32 new_offset)
{
        unsigned int pitch_pixels = pitch_tiles * tile_width;
        unsigned int tiles;

        WARN_ON(old_offset & (tile_size - 1));
        WARN_ON(new_offset & (tile_size - 1));
        WARN_ON(new_offset > old_offset);

        tiles = (old_offset - new_offset) / tile_size;

        *y += tiles / pitch_tiles * tile_height;
        *x += tiles % pitch_tiles * tile_width;

        /* minimize x in case it got needlessly big */
        *y += *x / pitch_pixels * tile_height;
        *x %= pitch_pixels;

        return new_offset;
}

static bool is_surface_linear(const struct drm_framebuffer *fb, int color_plane)
{
        return fb->modifier == DRM_FORMAT_MOD_LINEAR ||
               is_gen12_ccs_plane(fb, color_plane);
}

static u32 intel_adjust_aligned_offset(int *x, int *y,
                                       const struct drm_framebuffer *fb,
                                       int color_plane,
                                       unsigned int rotation,
                                       unsigned int pitch,
                                       u32 old_offset, u32 new_offset)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);
        unsigned int cpp = fb->format->cpp[color_plane];

        drm_WARN_ON(&dev_priv->drm, new_offset > old_offset);

        if (!is_surface_linear(fb, color_plane)) {
                unsigned int tile_size, tile_width, tile_height;
                unsigned int pitch_tiles;

                tile_size = intel_tile_size(dev_priv);
                intel_tile_dims(fb, color_plane, &tile_width, &tile_height);

                if (drm_rotation_90_or_270(rotation)) {
                        pitch_tiles = pitch / tile_height;
                        swap(tile_width, tile_height);
                } else {
                        pitch_tiles = pitch / (tile_width * cpp);
                }

                intel_adjust_tile_offset(x, y, tile_width, tile_height,
                                         tile_size, pitch_tiles,
                                         old_offset, new_offset);
        } else {
                old_offset += *y * pitch + *x * cpp;

                *y = (old_offset - new_offset) / pitch;
                *x = ((old_offset - new_offset) - *y * pitch) / cpp;
        }

        return new_offset;
}

/*
 * Adjust the tile offset by moving the difference into
 * the x/y offsets.
 */
static u32 intel_plane_adjust_aligned_offset(int *x, int *y,
                                             const struct intel_plane_state *state,
                                             int color_plane,
                                             u32 old_offset, u32 new_offset)
{
        return intel_adjust_aligned_offset(x, y, state->hw.fb, color_plane,
                                           state->hw.rotation,
                                           state->color_plane[color_plane].stride,
                                           old_offset, new_offset);
}

/*
 * Computes the aligned offset to the base tile and adjusts
 * x, y. bytes per pixel is assumed to be a power-of-two.
 *
 * In the 90/270 rotated case, x and y are assumed
 * to be already rotated to match the rotated GTT view, and
 * pitch is the tile_height aligned framebuffer height.
 *
 * This function is used when computing the derived information
 * under intel_framebuffer, so using any of that information
 * here is not allowed. Anything under drm_framebuffer can be
 * used. This is why the user has to pass in the pitch since it
 * is specified in the rotated orientation.
 */
static u32 intel_compute_aligned_offset(struct drm_i915_private *dev_priv,
                                        int *x, int *y,
                                        const struct drm_framebuffer *fb,
                                        int color_plane,
                                        unsigned int pitch,
                                        unsigned int rotation,
                                        u32 alignment)
{
        unsigned int cpp = fb->format->cpp[color_plane];
        u32 offset, offset_aligned;

        if (!is_surface_linear(fb, color_plane)) {
                unsigned int tile_size, tile_width, tile_height;
                unsigned int tile_rows, tiles, pitch_tiles;

                tile_size = intel_tile_size(dev_priv);
                intel_tile_dims(fb, color_plane, &tile_width, &tile_height);

                if (drm_rotation_90_or_270(rotation)) {
                        pitch_tiles = pitch / tile_height;
                        swap(tile_width, tile_height);
                } else {
                        pitch_tiles = pitch / (tile_width * cpp);
                }

                tile_rows = *y / tile_height;
                *y %= tile_height;

                tiles = *x / tile_width;
                *x %= tile_width;

                offset = (tile_rows * pitch_tiles + tiles) * tile_size;

                offset_aligned = offset;
                if (alignment)
                        offset_aligned = rounddown(offset_aligned, alignment);

                intel_adjust_tile_offset(x, y, tile_width, tile_height,
                                         tile_size, pitch_tiles,
                                         offset, offset_aligned);
        } else {
                offset = *y * pitch + *x * cpp;
                offset_aligned = offset;
                if (alignment) {
                        offset_aligned = rounddown(offset_aligned, alignment);
                        *y = (offset % alignment) / pitch;
                        *x = ((offset % alignment) - *y * pitch) / cpp;
                } else {
                        *y = *x = 0;
                }
        }

        return offset_aligned;
}

static u32 intel_plane_compute_aligned_offset(int *x, int *y,
                                              const struct intel_plane_state *state,
                                              int color_plane)
{
        struct intel_plane *intel_plane = to_intel_plane(state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(intel_plane->base.dev);
        const struct drm_framebuffer *fb = state->hw.fb;
        unsigned int rotation = state->hw.rotation;
        int pitch = state->color_plane[color_plane].stride;
        u32 alignment;

        if (intel_plane->id == PLANE_CURSOR)
                alignment = intel_cursor_alignment(dev_priv);
        else
                alignment = intel_surf_alignment(fb, color_plane);

        return intel_compute_aligned_offset(dev_priv, x, y, fb, color_plane,
                                            pitch, rotation, alignment);
}

/* Convert the fb->offset[] into x/y offsets */
static int intel_fb_offset_to_xy(int *x, int *y,
                                 const struct drm_framebuffer *fb,
                                 int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);
        unsigned int height;
        u32 alignment;

        if (INTEL_GEN(dev_priv) >= 12 &&
            is_semiplanar_uv_plane(fb, color_plane))
                alignment = intel_tile_row_size(fb, color_plane);
        else if (fb->modifier != DRM_FORMAT_MOD_LINEAR)
                alignment = intel_tile_size(dev_priv);
        else
                alignment = 0;

        if (alignment != 0 && fb->offsets[color_plane] % alignment) {
                drm_dbg_kms(&dev_priv->drm,
                            "Misaligned offset 0x%08x for color plane %d\n",
                            fb->offsets[color_plane], color_plane);
                return -EINVAL;
        }

        height = drm_framebuffer_plane_height(fb->height, fb, color_plane);
        height = ALIGN(height, intel_tile_height(fb, color_plane));

        /* Catch potential overflows early */
        if (add_overflows_t(u32, mul_u32_u32(height, fb->pitches[color_plane]),
                            fb->offsets[color_plane])) {
                drm_dbg_kms(&dev_priv->drm,
                            "Bad offset 0x%08x or pitch %d for color plane %d\n",
                            fb->offsets[color_plane], fb->pitches[color_plane],
                            color_plane);
                return -ERANGE;
        }

        *x = 0;
        *y = 0;

        intel_adjust_aligned_offset(x, y,
                                    fb, color_plane, DRM_MODE_ROTATE_0,
                                    fb->pitches[color_plane],
                                    fb->offsets[color_plane], 0);

        return 0;
}

static unsigned int intel_fb_modifier_to_tiling(u64 fb_modifier)
{
        switch (fb_modifier) {
        case I915_FORMAT_MOD_X_TILED:
                return I915_TILING_X;
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                return I915_TILING_Y;
        default:
                return I915_TILING_NONE;
        }
}

/*
 * From the Sky Lake PRM:
 * "The Color Control Surface (CCS) contains the compression status of
 *  the cache-line pairs. The compression state of the cache-line pair
 *  is specified by 2 bits in the CCS. Each CCS cache-line represents
 *  an area on the main surface of 16 x16 sets of 128 byte Y-tiled
 *  cache-line-pairs. CCS is always Y tiled."
 *
 * Since cache line pairs refers to horizontally adjacent cache lines,
 * each cache line in the CCS corresponds to an area of 32x16 cache
 * lines on the main surface. Since each pixel is 4 bytes, this gives
 * us a ratio of one byte in the CCS for each 8x16 pixels in the
 * main surface.
 */
static const struct drm_format_info skl_ccs_formats[] = {
        { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true, },
        { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true, },
};

/*
 * Gen-12 compression uses 4 bits of CCS data for each cache line pair in the
 * main surface. And each 64B CCS cache line represents an area of 4x1 Y-tiles
 * in the main surface. With 4 byte pixels and each Y-tile having dimensions of
 * 32x32 pixels, the ratio turns out to 1B in the CCS for every 2x32 pixels in
 * the main surface.
 */
static const struct drm_format_info gen12_ccs_formats[] = {
        { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, },
        { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, },
        { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, .has_alpha = true },
        { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, .has_alpha = true },
        { .format = DRM_FORMAT_YUYV, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_YVYU, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_UYVY, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_VYUY, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_NV12, .num_planes = 4,
          .char_per_block = { 1, 2, 1, 1 }, .block_w = { 1, 1, 4, 4 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
        { .format = DRM_FORMAT_P010, .num_planes = 4,
          .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
        { .format = DRM_FORMAT_P012, .num_planes = 4,
          .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
        { .format = DRM_FORMAT_P016, .num_planes = 4,
          .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
};

static const struct drm_format_info *
lookup_format_info(const struct drm_format_info formats[],
                   int num_formats, u32 format)
{
        int i;

        for (i = 0; i < num_formats; i++) {
                if (formats[i].format == format)
                        return &formats[i];
        }

        return NULL;
}

static const struct drm_format_info *
intel_get_format_info(const struct drm_mode_fb_cmd2 *cmd)
{
        switch (cmd->modifier[0]) {
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                return lookup_format_info(skl_ccs_formats,
                                          ARRAY_SIZE(skl_ccs_formats),
                                          cmd->pixel_format);
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                return lookup_format_info(gen12_ccs_formats,
                                          ARRAY_SIZE(gen12_ccs_formats),
                                          cmd->pixel_format);
        default:
                return NULL;
        }
}

bool is_ccs_modifier(u64 modifier)
{
        return modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS ||
               modifier == I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS ||
               modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
               modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
}

static int gen12_ccs_aux_stride(struct drm_framebuffer *fb, int ccs_plane)
{
        return DIV_ROUND_UP(fb->pitches[ccs_to_main_plane(fb, ccs_plane)],
                            512) * 64;
}

u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv,
                              u32 pixel_format, u64 modifier)
{
        struct intel_crtc *crtc;
        struct intel_plane *plane;

        /*
         * We assume the primary plane for pipe A has
         * the highest stride limits of them all,
         * if in case pipe A is disabled, use the first pipe from pipe_mask.
         */
        crtc = intel_get_first_crtc(dev_priv);
        if (!crtc)
                return 0;

        plane = to_intel_plane(crtc->base.primary);

        return plane->max_stride(plane, pixel_format, modifier,
                                 DRM_MODE_ROTATE_0);
}

static
u32 intel_fb_max_stride(struct drm_i915_private *dev_priv,
                        u32 pixel_format, u64 modifier)
{
        /*
         * Arbitrary limit for gen4+ chosen to match the
         * render engine max stride.
         *
         * The new CCS hash mode makes remapping impossible
         */
        if (!is_ccs_modifier(modifier)) {
                if (INTEL_GEN(dev_priv) >= 7)
                        return 256*1024;
                else if (INTEL_GEN(dev_priv) >= 4)
                        return 128*1024;
        }

        return intel_plane_fb_max_stride(dev_priv, pixel_format, modifier);
}

static u32
intel_fb_stride_alignment(const struct drm_framebuffer *fb, int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);
        u32 tile_width;

        if (is_surface_linear(fb, color_plane)) {
                u32 max_stride = intel_plane_fb_max_stride(dev_priv,
                                                           fb->format->format,
                                                           fb->modifier);

                /*
                 * To make remapping with linear generally feasible
                 * we need the stride to be page aligned.
                 */
                if (fb->pitches[color_plane] > max_stride &&
                    !is_ccs_modifier(fb->modifier))
                        return intel_tile_size(dev_priv);
                else
                        return 64;
        }

        tile_width = intel_tile_width_bytes(fb, color_plane);
        if (is_ccs_modifier(fb->modifier)) {
                /*
                 * Display WA #0531: skl,bxt,kbl,glk
                 *
                 * Render decompression and plane width > 3840
                 * combined with horizontal panning requires the
                 * plane stride to be a multiple of 4. We'll just
                 * require the entire fb to accommodate that to avoid
                 * potential runtime errors at plane configuration time.
                 */
                if (IS_GEN(dev_priv, 9) && color_plane == 0 && fb->width > 3840)
                        tile_width *= 4;
                /*
                 * The main surface pitch must be padded to a multiple of four
                 * tile widths.
                 */
                else if (INTEL_GEN(dev_priv) >= 12)
                        tile_width *= 4;
        }
        return tile_width;
}

bool intel_plane_can_remap(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        int i;

        /* We don't want to deal with remapping with cursors */
        if (plane->id == PLANE_CURSOR)
                return false;

        /*
         * The display engine limits already match/exceed the
         * render engine limits, so not much point in remapping.
         * Would also need to deal with the fence POT alignment
         * and gen2 2KiB GTT tile size.
         */
        if (INTEL_GEN(dev_priv) < 4)
                return false;

        /*
         * The new CCS hash mode isn't compatible with remapping as
         * the virtual address of the pages affects the compressed data.
         */
        if (is_ccs_modifier(fb->modifier))
                return false;

        /* Linear needs a page aligned stride for remapping */
        if (fb->modifier == DRM_FORMAT_MOD_LINEAR) {
                unsigned int alignment = intel_tile_size(dev_priv) - 1;

                for (i = 0; i < fb->format->num_planes; i++) {
                        if (fb->pitches[i] & alignment)
                                return false;
                }
        }

        return true;
}

static bool intel_plane_needs_remap(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int rotation = plane_state->hw.rotation;
        u32 stride, max_stride;

        /*
         * No remapping for invisible planes since we don't have
         * an actual source viewport to remap.
         */
        if (!plane_state->uapi.visible)
                return false;

        if (!intel_plane_can_remap(plane_state))
                return false;

        /*
         * FIXME: aux plane limits on gen9+ are
         * unclear in Bspec, for now no checking.
         */
        stride = intel_fb_pitch(fb, 0, rotation);
        max_stride = plane->max_stride(plane, fb->format->format,
                                       fb->modifier, rotation);

        return stride > max_stride;
}

static void
intel_fb_plane_get_subsampling(int *hsub, int *vsub,
                               const struct drm_framebuffer *fb,
                               int color_plane)
{
        int main_plane;

        if (color_plane == 0) {
                *hsub = 1;
                *vsub = 1;

                return;
        }

        /*
         * TODO: Deduct the subsampling from the char block for all CCS
         * formats and planes.
         */
        if (!is_gen12_ccs_plane(fb, color_plane)) {
                *hsub = fb->format->hsub;
                *vsub = fb->format->vsub;

                return;
        }

        main_plane = ccs_to_main_plane(fb, color_plane);
        *hsub = drm_format_info_block_width(fb->format, color_plane) /
                drm_format_info_block_width(fb->format, main_plane);

        /*
         * The min stride check in the core framebuffer_check() function
         * assumes that format->hsub applies to every plane except for the
         * first plane. That's incorrect for the CCS AUX plane of the first
         * plane, but for the above check to pass we must define the block
         * width with that subsampling applied to it. Adjust the width here
         * accordingly, so we can calculate the actual subsampling factor.
         */
        if (main_plane == 0)
                *hsub *= fb->format->hsub;

        *vsub = 32;
}
static int
intel_fb_check_ccs_xy(struct drm_framebuffer *fb, int ccs_plane, int x, int y)
{
        struct drm_i915_private *i915 = to_i915(fb->dev);
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        int main_plane;
        int hsub, vsub;
        int tile_width, tile_height;
        int ccs_x, ccs_y;
        int main_x, main_y;

        if (!is_ccs_plane(fb, ccs_plane))
                return 0;

        intel_tile_dims(fb, ccs_plane, &tile_width, &tile_height);
        intel_fb_plane_get_subsampling(&hsub, &vsub, fb, ccs_plane);

        tile_width *= hsub;
        tile_height *= vsub;

        ccs_x = (x * hsub) % tile_width;
        ccs_y = (y * vsub) % tile_height;

        main_plane = ccs_to_main_plane(fb, ccs_plane);
        main_x = intel_fb->normal[main_plane].x % tile_width;
        main_y = intel_fb->normal[main_plane].y % tile_height;

        /*
         * CCS doesn't have its own x/y offset register, so the intra CCS tile
         * x/y offsets must match between CCS and the main surface.
         */
        if (main_x != ccs_x || main_y != ccs_y) {
                drm_dbg_kms(&i915->drm,
                              "Bad CCS x/y (main %d,%d ccs %d,%d) full (main %d,%d ccs %d,%d)\n",
                              main_x, main_y,
                              ccs_x, ccs_y,
                              intel_fb->normal[main_plane].x,
                              intel_fb->normal[main_plane].y,
                              x, y);
                return -EINVAL;
        }

        return 0;
}

static void
intel_fb_plane_dims(int *w, int *h, struct drm_framebuffer *fb, int color_plane)
{
        int main_plane = is_ccs_plane(fb, color_plane) ?
                         ccs_to_main_plane(fb, color_plane) : 0;
        int main_hsub, main_vsub;
        int hsub, vsub;

        intel_fb_plane_get_subsampling(&main_hsub, &main_vsub, fb, main_plane);
        intel_fb_plane_get_subsampling(&hsub, &vsub, fb, color_plane);
        *w = fb->width / main_hsub / hsub;
        *h = fb->height / main_vsub / vsub;
}

/*
 * Setup the rotated view for an FB plane and return the size the GTT mapping
 * requires for this view.
 */
static u32
setup_fb_rotation(int plane, const struct intel_remapped_plane_info *plane_info,
                  u32 gtt_offset_rotated, int x, int y,
                  unsigned int width, unsigned int height,
                  unsigned int tile_size,
                  unsigned int tile_width, unsigned int tile_height,
                  struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct intel_rotation_info *rot_info = &intel_fb->rot_info;
        unsigned int pitch_tiles;
        struct drm_rect r;

        /* Y or Yf modifiers required for 90/270 rotation */
        if (fb->modifier != I915_FORMAT_MOD_Y_TILED &&
            fb->modifier != I915_FORMAT_MOD_Yf_TILED)
                return 0;

        if (drm_WARN_ON(fb->dev, plane >= ARRAY_SIZE(rot_info->plane)))
                return 0;

        rot_info->plane[plane] = *plane_info;

        intel_fb->rotated[plane].pitch = plane_info->height * tile_height;

        /* rotate the x/y offsets to match the GTT view */
        drm_rect_init(&r, x, y, width, height);
        drm_rect_rotate(&r,
                        plane_info->width * tile_width,
                        plane_info->height * tile_height,
                        DRM_MODE_ROTATE_270);
        x = r.x1;
        y = r.y1;

        /* rotate the tile dimensions to match the GTT view */
        pitch_tiles = intel_fb->rotated[plane].pitch / tile_height;
        swap(tile_width, tile_height);

        /*
         * We only keep the x/y offsets, so push all of the
         * gtt offset into the x/y offsets.
         */
        intel_adjust_tile_offset(&x, &y,
                                 tile_width, tile_height,
                                 tile_size, pitch_tiles,
                                 gtt_offset_rotated * tile_size, 0);

        /*
         * First pixel of the framebuffer from
         * the start of the rotated gtt mapping.
         */
        intel_fb->rotated[plane].x = x;
        intel_fb->rotated[plane].y = y;

        return plane_info->width * plane_info->height;
}

static int
intel_fill_fb_info(struct drm_i915_private *dev_priv,
                   struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        u32 gtt_offset_rotated = 0;
        unsigned int max_size = 0;
        int i, num_planes = fb->format->num_planes;
        unsigned int tile_size = intel_tile_size(dev_priv);

        for (i = 0; i < num_planes; i++) {
                unsigned int width, height;
                unsigned int cpp, size;
                u32 offset;
                int x, y;
                int ret;

                cpp = fb->format->cpp[i];
                intel_fb_plane_dims(&width, &height, fb, i);

                ret = intel_fb_offset_to_xy(&x, &y, fb, i);
                if (ret) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "bad fb plane %d offset: 0x%x\n",
                                    i, fb->offsets[i]);
                        return ret;
                }

                ret = intel_fb_check_ccs_xy(fb, i, x, y);
                if (ret)
                        return ret;

                /*
                 * The fence (if used) is aligned to the start of the object
                 * so having the framebuffer wrap around across the edge of the
                 * fenced region doesn't really work. We have no API to configure
                 * the fence start offset within the object (nor could we probably
                 * on gen2/3). So it's just easier if we just require that the
                 * fb layout agrees with the fence layout. We already check that the
                 * fb stride matches the fence stride elsewhere.
                 */
                if (i == 0 && i915_gem_object_is_tiled(obj) &&
                    (x + width) * cpp > fb->pitches[i]) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "bad fb plane %d offset: 0x%x\n",
                                     i, fb->offsets[i]);
                        return -EINVAL;
                }

                /*
                 * First pixel of the framebuffer from
                 * the start of the normal gtt mapping.
                 */
                intel_fb->normal[i].x = x;
                intel_fb->normal[i].y = y;

                offset = intel_compute_aligned_offset(dev_priv, &x, &y, fb, i,
                                                      fb->pitches[i],
                                                      DRM_MODE_ROTATE_0,
                                                      tile_size);
                offset /= tile_size;

                if (!is_surface_linear(fb, i)) {
                        struct intel_remapped_plane_info plane_info;
                        unsigned int tile_width, tile_height;

                        intel_tile_dims(fb, i, &tile_width, &tile_height);

                        plane_info.offset = offset;
                        plane_info.stride = DIV_ROUND_UP(fb->pitches[i],
                                                         tile_width * cpp);
                        plane_info.width = DIV_ROUND_UP(x + width, tile_width);
                        plane_info.height = DIV_ROUND_UP(y + height,
                                                         tile_height);

                        /* how many tiles does this plane need */
                        size = plane_info.stride * plane_info.height;
                        /*
                         * If the plane isn't horizontally tile aligned,
                         * we need one more tile.
                         */
                        if (x != 0)
                                size++;

                        gtt_offset_rotated +=
                                setup_fb_rotation(i, &plane_info,
                                                  gtt_offset_rotated,
                                                  x, y, width, height,
                                                  tile_size,
                                                  tile_width, tile_height,
                                                  fb);
                } else {
                        size = DIV_ROUND_UP((y + height) * fb->pitches[i] +
                                            x * cpp, tile_size);
                }

                /* how many tiles in total needed in the bo */
                max_size = max(max_size, offset + size);
        }

        if (mul_u32_u32(max_size, tile_size) > obj->base.size) {
                drm_dbg_kms(&dev_priv->drm,
                            "fb too big for bo (need %llu bytes, have %zu bytes)\n",
                            mul_u32_u32(max_size, tile_size), obj->base.size);
                return -EINVAL;
        }

        return 0;
}

static void
intel_plane_remap_gtt(struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        struct drm_framebuffer *fb = plane_state->hw.fb;
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct intel_rotation_info *info = &plane_state->view.rotated;
        unsigned int rotation = plane_state->hw.rotation;
        int i, num_planes = fb->format->num_planes;
        unsigned int tile_size = intel_tile_size(dev_priv);
        unsigned int src_x, src_y;
        unsigned int src_w, src_h;
        u32 gtt_offset = 0;

        memset(&plane_state->view, 0, sizeof(plane_state->view));
        plane_state->view.type = drm_rotation_90_or_270(rotation) ?
                I915_GGTT_VIEW_ROTATED : I915_GGTT_VIEW_REMAPPED;

        src_x = plane_state->uapi.src.x1 >> 16;
        src_y = plane_state->uapi.src.y1 >> 16;
        src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
        src_h = drm_rect_height(&plane_state->uapi.src) >> 16;

        drm_WARN_ON(&dev_priv->drm, is_ccs_modifier(fb->modifier));

        /* Make src coordinates relative to the viewport */
        drm_rect_translate(&plane_state->uapi.src,
                           -(src_x << 16), -(src_y << 16));

        /* Rotate src coordinates to match rotated GTT view */
        if (drm_rotation_90_or_270(rotation))
                drm_rect_rotate(&plane_state->uapi.src,
                                src_w << 16, src_h << 16,
                                DRM_MODE_ROTATE_270);

        for (i = 0; i < num_planes; i++) {
                unsigned int hsub = i ? fb->format->hsub : 1;
                unsigned int vsub = i ? fb->format->vsub : 1;
                unsigned int cpp = fb->format->cpp[i];
                unsigned int tile_width, tile_height;
                unsigned int width, height;
                unsigned int pitch_tiles;
                unsigned int x, y;
                u32 offset;

                intel_tile_dims(fb, i, &tile_width, &tile_height);

                x = src_x / hsub;
                y = src_y / vsub;
                width = src_w / hsub;
                height = src_h / vsub;

                /*
                 * First pixel of the src viewport from the
                 * start of the normal gtt mapping.
                 */
                x += intel_fb->normal[i].x;
                y += intel_fb->normal[i].y;

                offset = intel_compute_aligned_offset(dev_priv, &x, &y,
                                                      fb, i, fb->pitches[i],
                                                      DRM_MODE_ROTATE_0, tile_size);
                offset /= tile_size;

                drm_WARN_ON(&dev_priv->drm, i >= ARRAY_SIZE(info->plane));
                info->plane[i].offset = offset;
                info->plane[i].stride = DIV_ROUND_UP(fb->pitches[i],
                                                     tile_width * cpp);
                info->plane[i].width = DIV_ROUND_UP(x + width, tile_width);
                info->plane[i].height = DIV_ROUND_UP(y + height, tile_height);

                if (drm_rotation_90_or_270(rotation)) {
                        struct drm_rect r;

                        /* rotate the x/y offsets to match the GTT view */
                        drm_rect_init(&r, x, y, width, height);
                        drm_rect_rotate(&r,
                                        info->plane[i].width * tile_width,
                                        info->plane[i].height * tile_height,
                                        DRM_MODE_ROTATE_270);
                        x = r.x1;
                        y = r.y1;

                        pitch_tiles = info->plane[i].height;
                        plane_state->color_plane[i].stride = pitch_tiles * tile_height;

                        /* rotate the tile dimensions to match the GTT view */
                        swap(tile_width, tile_height);
                } else {
                        pitch_tiles = info->plane[i].width;
                        plane_state->color_plane[i].stride = pitch_tiles * tile_width * cpp;
                }

                /*
                 * We only keep the x/y offsets, so push all of the
                 * gtt offset into the x/y offsets.
                 */
                intel_adjust_tile_offset(&x, &y,
                                         tile_width, tile_height,
                                         tile_size, pitch_tiles,
                                         gtt_offset * tile_size, 0);

                gtt_offset += info->plane[i].width * info->plane[i].height;

                plane_state->color_plane[i].offset = 0;
                plane_state->color_plane[i].x = x;
                plane_state->color_plane[i].y = y;
        }
}

static int
intel_plane_compute_gtt(struct intel_plane_state *plane_state)
{
        const struct intel_framebuffer *fb =
                to_intel_framebuffer(plane_state->hw.fb);
        unsigned int rotation = plane_state->hw.rotation;
        int i, num_planes;

        if (!fb)
                return 0;

        num_planes = fb->base.format->num_planes;

        if (intel_plane_needs_remap(plane_state)) {
                intel_plane_remap_gtt(plane_state);

                /*
                 * Sometimes even remapping can't overcome
                 * the stride limitations :( Can happen with
                 * big plane sizes and suitably misaligned
                 * offsets.
                 */
                return intel_plane_check_stride(plane_state);
        }

        intel_fill_fb_ggtt_view(&plane_state->view, &fb->base, rotation);

        for (i = 0; i < num_planes; i++) {
                plane_state->color_plane[i].stride = intel_fb_pitch(&fb->base, i, rotation);
                plane_state->color_plane[i].offset = 0;

                if (drm_rotation_90_or_270(rotation)) {
                        plane_state->color_plane[i].x = fb->rotated[i].x;
                        plane_state->color_plane[i].y = fb->rotated[i].y;
                } else {
                        plane_state->color_plane[i].x = fb->normal[i].x;
                        plane_state->color_plane[i].y = fb->normal[i].y;
                }
        }

        /* Rotate src coordinates to match rotated GTT view */
        if (drm_rotation_90_or_270(rotation))
                drm_rect_rotate(&plane_state->uapi.src,
                                fb->base.width << 16, fb->base.height << 16,
                                DRM_MODE_ROTATE_270);

        return intel_plane_check_stride(plane_state);
}

static int i9xx_format_to_fourcc(int format)
{
        switch (format) {
        case DISPPLANE_8BPP:
                return DRM_FORMAT_C8;
        case DISPPLANE_BGRA555:
                return DRM_FORMAT_ARGB1555;
        case DISPPLANE_BGRX555:
                return DRM_FORMAT_XRGB1555;
        case DISPPLANE_BGRX565:
                return DRM_FORMAT_RGB565;
        default:
        case DISPPLANE_BGRX888:
                return DRM_FORMAT_XRGB8888;
        case DISPPLANE_RGBX888:
                return DRM_FORMAT_XBGR8888;
        case DISPPLANE_BGRA888:
                return DRM_FORMAT_ARGB8888;
        case DISPPLANE_RGBA888:
                return DRM_FORMAT_ABGR8888;
        case DISPPLANE_BGRX101010:
                return DRM_FORMAT_XRGB2101010;
        case DISPPLANE_RGBX101010:
                return DRM_FORMAT_XBGR2101010;
        case DISPPLANE_BGRA101010:
                return DRM_FORMAT_ARGB2101010;
        case DISPPLANE_RGBA101010:
                return DRM_FORMAT_ABGR2101010;
        case DISPPLANE_RGBX161616:
                return DRM_FORMAT_XBGR16161616F;
        }
}

int skl_format_to_fourcc(int format, bool rgb_order, bool alpha)
{
        switch (format) {
        case PLANE_CTL_FORMAT_RGB_565:
                return DRM_FORMAT_RGB565;
        case PLANE_CTL_FORMAT_NV12:
                return DRM_FORMAT_NV12;
        case PLANE_CTL_FORMAT_XYUV:
                return DRM_FORMAT_XYUV8888;
        case PLANE_CTL_FORMAT_P010:
                return DRM_FORMAT_P010;
        case PLANE_CTL_FORMAT_P012:
                return DRM_FORMAT_P012;
        case PLANE_CTL_FORMAT_P016:
                return DRM_FORMAT_P016;
        case PLANE_CTL_FORMAT_Y210:
                return DRM_FORMAT_Y210;
        case PLANE_CTL_FORMAT_Y212:
                return DRM_FORMAT_Y212;
        case PLANE_CTL_FORMAT_Y216:
                return DRM_FORMAT_Y216;
        case PLANE_CTL_FORMAT_Y410:
                return DRM_FORMAT_XVYU2101010;
        case PLANE_CTL_FORMAT_Y412:
                return DRM_FORMAT_XVYU12_16161616;
        case PLANE_CTL_FORMAT_Y416:
                return DRM_FORMAT_XVYU16161616;
        default:
        case PLANE_CTL_FORMAT_XRGB_8888:
                if (rgb_order) {
                        if (alpha)
                                return DRM_FORMAT_ABGR8888;
                        else
                                return DRM_FORMAT_XBGR8888;
                } else {
                        if (alpha)
                                return DRM_FORMAT_ARGB8888;
                        else
                                return DRM_FORMAT_XRGB8888;
                }
        case PLANE_CTL_FORMAT_XRGB_2101010:
                if (rgb_order) {
                        if (alpha)
                                return DRM_FORMAT_ABGR2101010;
                        else
                                return DRM_FORMAT_XBGR2101010;
                } else {
                        if (alpha)
                                return DRM_FORMAT_ARGB2101010;
                        else
                                return DRM_FORMAT_XRGB2101010;
                }
        case PLANE_CTL_FORMAT_XRGB_16161616F:
                if (rgb_order) {
                        if (alpha)
                                return DRM_FORMAT_ABGR16161616F;
                        else
                                return DRM_FORMAT_XBGR16161616F;
                } else {
                        if (alpha)
                                return DRM_FORMAT_ARGB16161616F;
                        else
                                return DRM_FORMAT_XRGB16161616F;
                }
        }
}

static struct i915_vma *
initial_plane_vma(struct drm_i915_private *i915,
                  struct intel_initial_plane_config *plane_config)
{
        struct drm_i915_gem_object *obj;
        struct i915_vma *vma;
        u32 base, size;

        if (plane_config->size == 0)
                return NULL;

        base = round_down(plane_config->base,
                          I915_GTT_MIN_ALIGNMENT);
        size = round_up(plane_config->base + plane_config->size,
                        I915_GTT_MIN_ALIGNMENT);
        size -= base;

        /*
         * If the FB is too big, just don't use it since fbdev is not very
         * important and we should probably use that space with FBC or other
         * features.
         */
        if (size * 2 > i915->stolen_usable_size)
                return NULL;

        obj = i915_gem_object_create_stolen_for_preallocated(i915, base, size);
        if (IS_ERR(obj))
                return NULL;

        switch (plane_config->tiling) {
        case I915_TILING_NONE:
                break;
        case I915_TILING_X:
        case I915_TILING_Y:
                obj->tiling_and_stride =
                        plane_config->fb->base.pitches[0] |
                        plane_config->tiling;
                break;
        default:
                MISSING_CASE(plane_config->tiling);
                goto err_obj;
        }

        vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
        if (IS_ERR(vma))
                goto err_obj;

        if (i915_ggtt_pin(vma, 0, PIN_MAPPABLE | PIN_OFFSET_FIXED | base))
                goto err_obj;

        if (i915_gem_object_is_tiled(obj) &&
            !i915_vma_is_map_and_fenceable(vma))
                goto err_obj;

        return vma;

err_obj:
        i915_gem_object_put(obj);
        return NULL;
}

static bool
intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
                              struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_mode_fb_cmd2 mode_cmd = { 0 };
        struct drm_framebuffer *fb = &plane_config->fb->base;
        struct i915_vma *vma;

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
        case I915_FORMAT_MOD_Y_TILED:
                break;
        default:
                drm_dbg(&dev_priv->drm,
                        "Unsupported modifier for initial FB: 0x%llx\n",
                        fb->modifier);
                return false;
        }

        vma = initial_plane_vma(dev_priv, plane_config);
        if (!vma)
                return false;

        mode_cmd.pixel_format = fb->format->format;
        mode_cmd.width = fb->width;
        mode_cmd.height = fb->height;
        mode_cmd.pitches[0] = fb->pitches[0];
        mode_cmd.modifier[0] = fb->modifier;
        mode_cmd.flags = DRM_MODE_FB_MODIFIERS;

        if (intel_framebuffer_init(to_intel_framebuffer(fb),
                                   vma->obj, &mode_cmd)) {
                drm_dbg_kms(&dev_priv->drm, "intel fb init failed\n");
                goto err_vma;
        }

        plane_config->vma = vma;
        return true;

err_vma:
        i915_vma_put(vma);
        return false;
}

static void
intel_set_plane_visible(struct intel_crtc_state *crtc_state,
                        struct intel_plane_state *plane_state,
                        bool visible)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);

        plane_state->uapi.visible = visible;

        if (visible)
                crtc_state->uapi.plane_mask |= drm_plane_mask(&plane->base);
        else
                crtc_state->uapi.plane_mask &= ~drm_plane_mask(&plane->base);
}

static void fixup_active_planes(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
        struct drm_plane *plane;

        /*
         * Active_planes aliases if multiple "primary" or cursor planes
         * have been used on the same (or wrong) pipe. plane_mask uses
         * unique ids, hence we can use that to reconstruct active_planes.
         */
        crtc_state->active_planes = 0;

        drm_for_each_plane_mask(plane, &dev_priv->drm,
                                crtc_state->uapi.plane_mask)
                crtc_state->active_planes |= BIT(to_intel_plane(plane)->id);
}

static void intel_plane_disable_noatomic(struct intel_crtc *crtc,
                                         struct intel_plane *plane)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        struct intel_plane_state *plane_state =
                to_intel_plane_state(plane->base.state);

        drm_dbg_kms(&dev_priv->drm,
                    "Disabling [PLANE:%d:%s] on [CRTC:%d:%s]\n",
                    plane->base.base.id, plane->base.name,
                    crtc->base.base.id, crtc->base.name);

        intel_set_plane_visible(crtc_state, plane_state, false);
        fixup_active_planes(crtc_state);
        crtc_state->data_rate[plane->id] = 0;
        crtc_state->min_cdclk[plane->id] = 0;

        if (plane->id == PLANE_PRIMARY)
                hsw_disable_ips(crtc_state);

        /*
         * Vblank time updates from the shadow to live plane control register
         * are blocked if the memory self-refresh mode is active at that
         * moment. So to make sure the plane gets truly disabled, disable
         * first the self-refresh mode. The self-refresh enable bit in turn
         * will be checked/applied by the HW only at the next frame start
         * event which is after the vblank start event, so we need to have a
         * wait-for-vblank between disabling the plane and the pipe.
         */
        if (HAS_GMCH(dev_priv) &&
            intel_set_memory_cxsr(dev_priv, false))
                intel_wait_for_vblank(dev_priv, crtc->pipe);

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So disable underrun reporting before all the planes get disabled.
         */
        if (IS_GEN(dev_priv, 2) && !crtc_state->active_planes)
                intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, false);

        intel_disable_plane(plane, crtc_state);
}

static struct intel_frontbuffer *
to_intel_frontbuffer(struct drm_framebuffer *fb)
{
        return fb ? to_intel_framebuffer(fb)->frontbuffer : NULL;
}

static void
intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
                             struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_crtc *c;
        struct drm_plane *primary = intel_crtc->base.primary;
        struct drm_plane_state *plane_state = primary->state;
        struct intel_plane *intel_plane = to_intel_plane(primary);
        struct intel_plane_state *intel_state =
                to_intel_plane_state(plane_state);
        struct drm_framebuffer *fb;
        struct i915_vma *vma;

        if (!plane_config->fb)
                return;

        if (intel_alloc_initial_plane_obj(intel_crtc, plane_config)) {
                fb = &plane_config->fb->base;
                vma = plane_config->vma;
                goto valid_fb;
        }

        /*
         * Failed to alloc the obj, check to see if we should share
         * an fb with another CRTC instead
         */
        for_each_crtc(dev, c) {
                struct intel_plane_state *state;

                if (c == &intel_crtc->base)
                        continue;

                if (!to_intel_crtc(c)->active)
                        continue;

                state = to_intel_plane_state(c->primary->state);
                if (!state->vma)
                        continue;

                if (intel_plane_ggtt_offset(state) == plane_config->base) {
                        fb = state->hw.fb;
                        vma = state->vma;
                        goto valid_fb;
                }
        }

        /*
         * We've failed to reconstruct the BIOS FB.  Current display state
         * indicates that the primary plane is visible, but has a NULL FB,
         * which will lead to problems later if we don't fix it up.  The
         * simplest solution is to just disable the primary plane now and
         * pretend the BIOS never had it enabled.
         */
        intel_plane_disable_noatomic(intel_crtc, intel_plane);

        return;

valid_fb:
        intel_state->hw.rotation = plane_config->rotation;
        intel_fill_fb_ggtt_view(&intel_state->view, fb,
                                intel_state->hw.rotation);
        intel_state->color_plane[0].stride =
                intel_fb_pitch(fb, 0, intel_state->hw.rotation);

        __i915_vma_pin(vma);
        intel_state->vma = i915_vma_get(vma);
        if (intel_plane_uses_fence(intel_state) && i915_vma_pin_fence(vma) == 0)
                if (vma->fence)
                        intel_state->flags |= PLANE_HAS_FENCE;

        plane_state->src_x = 0;
        plane_state->src_y = 0;
        plane_state->src_w = fb->width << 16;
        plane_state->src_h = fb->height << 16;

        plane_state->crtc_x = 0;
        plane_state->crtc_y = 0;
        plane_state->crtc_w = fb->width;
        plane_state->crtc_h = fb->height;

        intel_state->uapi.src = drm_plane_state_src(plane_state);
        intel_state->uapi.dst = drm_plane_state_dest(plane_state);

        if (plane_config->tiling)
                dev_priv->preserve_bios_swizzle = true;

        plane_state->fb = fb;
        drm_framebuffer_get(fb);

        plane_state->crtc = &intel_crtc->base;
        intel_plane_copy_uapi_to_hw_state(intel_state, intel_state);

        intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);

        atomic_or(to_intel_plane(primary)->frontbuffer_bit,
                  &to_intel_frontbuffer(fb)->bits);
}

static int skl_max_plane_width(const struct drm_framebuffer *fb,
                               int color_plane,
                               unsigned int rotation)
{
        int cpp = fb->format->cpp[color_plane];

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                /*
                 * Validated limit is 4k, but has 5k should
                 * work apart from the following features:
                 * - Ytile (already limited to 4k)
                 * - FP16 (already limited to 4k)
                 * - render compression (already limited to 4k)
                 * - KVMR sprite and cursor (don't care)
                 * - horizontal panning (TODO verify this)
                 * - pipe and plane scaling (TODO verify this)
                 */
                if (cpp == 8)
                        return 4096;
                else
                        return 5120;
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                /* FIXME AUX plane? */
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Yf_TILED:
                if (cpp == 8)
                        return 2048;
                else
                        return 4096;
        default:
                MISSING_CASE(fb->modifier);
                return 2048;
        }
}

static int glk_max_plane_width(const struct drm_framebuffer *fb,
                               int color_plane,
                               unsigned int rotation)
{
        int cpp = fb->format->cpp[color_plane];

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                if (cpp == 8)
                        return 4096;
                else
                        return 5120;
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                /* FIXME AUX plane? */
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Yf_TILED:
                if (cpp == 8)
                        return 2048;
                else
                        return 5120;
        default:
                MISSING_CASE(fb->modifier);
                return 2048;
        }
}

static int icl_max_plane_width(const struct drm_framebuffer *fb,
                               int color_plane,
                               unsigned int rotation)
{
        return 5120;
}

static int skl_max_plane_height(void)
{
        return 4096;
}

static int icl_max_plane_height(void)
{
        return 4320;
}

static bool
skl_check_main_ccs_coordinates(struct intel_plane_state *plane_state,
                               int main_x, int main_y, u32 main_offset,
                               int ccs_plane)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        int aux_x = plane_state->color_plane[ccs_plane].x;
        int aux_y = plane_state->color_plane[ccs_plane].y;
        u32 aux_offset = plane_state->color_plane[ccs_plane].offset;
        u32 alignment = intel_surf_alignment(fb, ccs_plane);
        int hsub;
        int vsub;

        intel_fb_plane_get_subsampling(&hsub, &vsub, fb, ccs_plane);
        while (aux_offset >= main_offset && aux_y <= main_y) {
                int x, y;

                if (aux_x == main_x && aux_y == main_y)
                        break;

                if (aux_offset == 0)
                        break;

                x = aux_x / hsub;
                y = aux_y / vsub;
                aux_offset = intel_plane_adjust_aligned_offset(&x, &y,
                                                               plane_state,
                                                               ccs_plane,
                                                               aux_offset,
                                                               aux_offset -
                                                                alignment);
                aux_x = x * hsub + aux_x % hsub;
                aux_y = y * vsub + aux_y % vsub;
        }

        if (aux_x != main_x || aux_y != main_y)
                return false;

        plane_state->color_plane[ccs_plane].offset = aux_offset;
        plane_state->color_plane[ccs_plane].x = aux_x;
        plane_state->color_plane[ccs_plane].y = aux_y;

        return true;
}

unsigned int
intel_plane_fence_y_offset(const struct intel_plane_state *plane_state)
{
        int x = 0, y = 0;

        intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                          plane_state->color_plane[0].offset, 0);

        return y;
}

static int skl_check_main_surface(struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int rotation = plane_state->hw.rotation;
        int x = plane_state->uapi.src.x1 >> 16;
        int y = plane_state->uapi.src.y1 >> 16;
        int w = drm_rect_width(&plane_state->uapi.src) >> 16;
        int h = drm_rect_height(&plane_state->uapi.src) >> 16;
        int max_width;
        int max_height;
        u32 alignment;
        u32 offset;
        int aux_plane = intel_main_to_aux_plane(fb, 0);
        u32 aux_offset = plane_state->color_plane[aux_plane].offset;

        if (INTEL_GEN(dev_priv) >= 11)
                max_width = icl_max_plane_width(fb, 0, rotation);
        else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
                max_width = glk_max_plane_width(fb, 0, rotation);
        else
                max_width = skl_max_plane_width(fb, 0, rotation);

        if (INTEL_GEN(dev_priv) >= 11)
                max_height = icl_max_plane_height();
        else
                max_height = skl_max_plane_height();

        if (w > max_width || h > max_height) {
                drm_dbg_kms(&dev_priv->drm,
                            "requested Y/RGB source size %dx%d too big (limit %dx%d)\n",
                            w, h, max_width, max_height);
                return -EINVAL;
        }

        intel_add_fb_offsets(&x, &y, plane_state, 0);
        offset = intel_plane_compute_aligned_offset(&x, &y, plane_state, 0);
        alignment = intel_surf_alignment(fb, 0);
        if (drm_WARN_ON(&dev_priv->drm, alignment && !is_power_of_2(alignment)))
                return -EINVAL;

        /*
         * AUX surface offset is specified as the distance from the
         * main surface offset, and it must be non-negative. Make
         * sure that is what we will get.
         */
        if (offset > aux_offset)
                offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                                           offset, aux_offset & ~(alignment - 1));

        /*
         * When using an X-tiled surface, the plane blows up
         * if the x offset + width exceed the stride.
         *
         * TODO: linear and Y-tiled seem fine, Yf untested,
         */
        if (fb->modifier == I915_FORMAT_MOD_X_TILED) {
                int cpp = fb->format->cpp[0];

                while ((x + w) * cpp > plane_state->color_plane[0].stride) {
                        if (offset == 0) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "Unable to find suitable display surface offset due to X-tiling\n");
                                return -EINVAL;
                        }

                        offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                                                   offset, offset - alignment);
                }
        }

        /*
         * CCS AUX surface doesn't have its own x/y offsets, we must make sure
         * they match with the main surface x/y offsets.
         */
        if (is_ccs_modifier(fb->modifier)) {
                while (!skl_check_main_ccs_coordinates(plane_state, x, y,
                                                       offset, aux_plane)) {
                        if (offset == 0)
                                break;

                        offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                                                   offset, offset - alignment);
                }

                if (x != plane_state->color_plane[aux_plane].x ||
                    y != plane_state->color_plane[aux_plane].y) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Unable to find suitable display surface offset due to CCS\n");
                        return -EINVAL;
                }
        }

        plane_state->color_plane[0].offset = offset;
        plane_state->color_plane[0].x = x;
        plane_state->color_plane[0].y = y;

        /*
         * Put the final coordinates back so that the src
         * coordinate checks will see the right values.
         */
        drm_rect_translate_to(&plane_state->uapi.src,
                              x << 16, y << 16);

        return 0;
}

static int skl_check_nv12_aux_surface(struct intel_plane_state *plane_state)
{
        struct drm_i915_private *i915 = to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int rotation = plane_state->hw.rotation;
        int uv_plane = 1;
        int max_width = skl_max_plane_width(fb, uv_plane, rotation);
        int max_height = 4096;
        int x = plane_state->uapi.src.x1 >> 17;
        int y = plane_state->uapi.src.y1 >> 17;
        int w = drm_rect_width(&plane_state->uapi.src) >> 17;
        int h = drm_rect_height(&plane_state->uapi.src) >> 17;
        u32 offset;

        intel_add_fb_offsets(&x, &y, plane_state, uv_plane);
        offset = intel_plane_compute_aligned_offset(&x, &y,
                                                    plane_state, uv_plane);

        /* FIXME not quite sure how/if these apply to the chroma plane */
        if (w > max_width || h > max_height) {
                drm_dbg_kms(&i915->drm,
                            "CbCr source size %dx%d too big (limit %dx%d)\n",
                            w, h, max_width, max_height);
                return -EINVAL;
        }

        if (is_ccs_modifier(fb->modifier)) {
                int ccs_plane = main_to_ccs_plane(fb, uv_plane);
                int aux_offset = plane_state->color_plane[ccs_plane].offset;
                int alignment = intel_surf_alignment(fb, uv_plane);

                if (offset > aux_offset)
                        offset = intel_plane_adjust_aligned_offset(&x, &y,
                                                                   plane_state,
                                                                   uv_plane,
                                                                   offset,
                                                                   aux_offset & ~(alignment - 1));

                while (!skl_check_main_ccs_coordinates(plane_state, x, y,
                                                       offset, ccs_plane)) {
                        if (offset == 0)
                                break;

                        offset = intel_plane_adjust_aligned_offset(&x, &y,
                                                                   plane_state,
                                                                   uv_plane,
                                                                   offset, offset - alignment);
                }

                if (x != plane_state->color_plane[ccs_plane].x ||
                    y != plane_state->color_plane[ccs_plane].y) {
                        drm_dbg_kms(&i915->drm,
                                    "Unable to find suitable display surface offset due to CCS\n");
                        return -EINVAL;
                }
        }

        plane_state->color_plane[uv_plane].offset = offset;
        plane_state->color_plane[uv_plane].x = x;
        plane_state->color_plane[uv_plane].y = y;

        return 0;
}

static int skl_check_ccs_aux_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        int src_x = plane_state->uapi.src.x1 >> 16;
        int src_y = plane_state->uapi.src.y1 >> 16;
        u32 offset;
        int ccs_plane;

        for (ccs_plane = 0; ccs_plane < fb->format->num_planes; ccs_plane++) {
                int main_hsub, main_vsub;
                int hsub, vsub;
                int x, y;

                if (!is_ccs_plane(fb, ccs_plane))
                        continue;

                intel_fb_plane_get_subsampling(&main_hsub, &main_vsub, fb,
                                               ccs_to_main_plane(fb, ccs_plane));
                intel_fb_plane_get_subsampling(&hsub, &vsub, fb, ccs_plane);

                hsub *= main_hsub;
                vsub *= main_vsub;
                x = src_x / hsub;
                y = src_y / vsub;

                intel_add_fb_offsets(&x, &y, plane_state, ccs_plane);

                offset = intel_plane_compute_aligned_offset(&x, &y,
                                                            plane_state,
                                                            ccs_plane);

                plane_state->color_plane[ccs_plane].offset = offset;
                plane_state->color_plane[ccs_plane].x = (x * hsub +
                                                         src_x % hsub) /
                                                        main_hsub;
                plane_state->color_plane[ccs_plane].y = (y * vsub +
                                                         src_y % vsub) /
                                                        main_vsub;
        }

        return 0;
}

int skl_check_plane_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        int ret;
        bool needs_aux = false;

        ret = intel_plane_compute_gtt(plane_state);
        if (ret)
                return ret;

        if (!plane_state->uapi.visible)
                return 0;

        /*
         * Handle the AUX surface first since the main surface setup depends on
         * it.
         */
        if (is_ccs_modifier(fb->modifier)) {
                needs_aux = true;
                ret = skl_check_ccs_aux_surface(plane_state);
                if (ret)
                        return ret;
        }

        if (intel_format_info_is_yuv_semiplanar(fb->format,
                                                fb->modifier)) {
                needs_aux = true;
                ret = skl_check_nv12_aux_surface(plane_state);
                if (ret)
                        return ret;
        }

        if (!needs_aux) {
                int i;

                for (i = 1; i < fb->format->num_planes; i++) {
                        plane_state->color_plane[i].offset = ~0xfff;
                        plane_state->color_plane[i].x = 0;
                        plane_state->color_plane[i].y = 0;
                }
        }

        ret = skl_check_main_surface(plane_state);
        if (ret)
                return ret;

        return 0;
}

static void i9xx_plane_ratio(const struct intel_crtc_state *crtc_state,
                             const struct intel_plane_state *plane_state,
                             unsigned int *num, unsigned int *den)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int cpp = fb->format->cpp[0];

        /*
         * g4x bspec says 64bpp pixel rate can't exceed 80%
         * of cdclk when the sprite plane is enabled on the
         * same pipe. ilk/snb bspec says 64bpp pixel rate is
         * never allowed to exceed 80% of cdclk. Let's just go
         * with the ilk/snb limit always.
         */
        if (cpp == 8) {
                *num = 10;
                *den = 8;
        } else {
                *num = 1;
                *den = 1;
        }
}

static int i9xx_plane_min_cdclk(const struct intel_crtc_state *crtc_state,
                                const struct intel_plane_state *plane_state)
{
        unsigned int pixel_rate;
        unsigned int num, den;

        /*
         * Note that crtc_state->pixel_rate accounts for both
         * horizontal and vertical panel fitter downscaling factors.
         * Pre-HSW bspec tells us to only consider the horizontal
         * downscaling factor here. We ignore that and just consider
         * both for simplicity.
         */
        pixel_rate = crtc_state->pixel_rate;

        i9xx_plane_ratio(crtc_state, plane_state, &num, &den);

        /* two pixels per clock with double wide pipe */
        if (crtc_state->double_wide)
                den *= 2;

        return DIV_ROUND_UP(pixel_rate * num, den);
}

unsigned int
i9xx_plane_max_stride(struct intel_plane *plane,
                      u32 pixel_format, u64 modifier,
                      unsigned int rotation)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);

        if (!HAS_GMCH(dev_priv)) {
                return 32*1024;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                if (modifier == I915_FORMAT_MOD_X_TILED)
                        return 16*1024;
                else
                        return 32*1024;
        } else if (INTEL_GEN(dev_priv) >= 3) {
                if (modifier == I915_FORMAT_MOD_X_TILED)
                        return 8*1024;
                else
                        return 16*1024;
        } else {
                if (plane->i9xx_plane == PLANE_C)
                        return 4*1024;
                else
                        return 8*1024;
        }
}

static u32 i9xx_plane_ctl_crtc(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 dspcntr = 0;

        if (crtc_state->gamma_enable)
                dspcntr |= DISPPLANE_GAMMA_ENABLE;

        if (crtc_state->csc_enable)
                dspcntr |= DISPPLANE_PIPE_CSC_ENABLE;

        if (INTEL_GEN(dev_priv) < 5)
                dspcntr |= DISPPLANE_SEL_PIPE(crtc->pipe);

        return dspcntr;
}

static u32 i9xx_plane_ctl(const struct intel_crtc_state *crtc_state,
                          const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int rotation = plane_state->hw.rotation;
        u32 dspcntr;

        dspcntr = DISPLAY_PLANE_ENABLE;

        if (IS_G4X(dev_priv) || IS_GEN(dev_priv, 5) ||
            IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
                dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;

        switch (fb->format->format) {
        case DRM_FORMAT_C8:
                dspcntr |= DISPPLANE_8BPP;
                break;
        case DRM_FORMAT_XRGB1555:
                dspcntr |= DISPPLANE_BGRX555;
                break;
        case DRM_FORMAT_ARGB1555:
                dspcntr |= DISPPLANE_BGRA555;
                break;
        case DRM_FORMAT_RGB565:
                dspcntr |= DISPPLANE_BGRX565;
                break;
        case DRM_FORMAT_XRGB8888:
                dspcntr |= DISPPLANE_BGRX888;
                break;
        case DRM_FORMAT_XBGR8888:
                dspcntr |= DISPPLANE_RGBX888;
                break;
        case DRM_FORMAT_ARGB8888:
                dspcntr |= DISPPLANE_BGRA888;
                break;
        case DRM_FORMAT_ABGR8888:
                dspcntr |= DISPPLANE_RGBA888;
                break;
        case DRM_FORMAT_XRGB2101010:
                dspcntr |= DISPPLANE_BGRX101010;
                break;
        case DRM_FORMAT_XBGR2101010:
                dspcntr |= DISPPLANE_RGBX101010;
                break;
        case DRM_FORMAT_ARGB2101010:
                dspcntr |= DISPPLANE_BGRA101010;
                break;
        case DRM_FORMAT_ABGR2101010:
                dspcntr |= DISPPLANE_RGBA101010;
                break;
        case DRM_FORMAT_XBGR16161616F:
                dspcntr |= DISPPLANE_RGBX161616;
                break;
        default:
                MISSING_CASE(fb->format->format);
                return 0;
        }

        if (INTEL_GEN(dev_priv) >= 4 &&
            fb->modifier == I915_FORMAT_MOD_X_TILED)
                dspcntr |= DISPPLANE_TILED;

        if (rotation & DRM_MODE_ROTATE_180)
                dspcntr |= DISPPLANE_ROTATE_180;

        if (rotation & DRM_MODE_REFLECT_X)
                dspcntr |= DISPPLANE_MIRROR;

        return dspcntr;
}

int i9xx_check_plane_surface(struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        int src_x, src_y, src_w;
        u32 offset;
        int ret;

        ret = intel_plane_compute_gtt(plane_state);
        if (ret)
                return ret;

        if (!plane_state->uapi.visible)
                return 0;

        src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
        src_x = plane_state->uapi.src.x1 >> 16;
        src_y = plane_state->uapi.src.y1 >> 16;

        /* Undocumented hardware limit on i965/g4x/vlv/chv */
        if (HAS_GMCH(dev_priv) && fb->format->cpp[0] == 8 && src_w > 2048)
                return -EINVAL;

        intel_add_fb_offsets(&src_x, &src_y, plane_state, 0);

        if (INTEL_GEN(dev_priv) >= 4)
                offset = intel_plane_compute_aligned_offset(&src_x, &src_y,
                                                            plane_state, 0);
        else
                offset = 0;

        /*
         * Put the final coordinates back so that the src
         * coordinate checks will see the right values.
         */
        drm_rect_translate_to(&plane_state->uapi.src,
                              src_x << 16, src_y << 16);

        /* HSW/BDW do this automagically in hardware */
        if (!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv)) {
                unsigned int rotation = plane_state->hw.rotation;
                int src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
                int src_h = drm_rect_height(&plane_state->uapi.src) >> 16;

                if (rotation & DRM_MODE_ROTATE_180) {
                        src_x += src_w - 1;
                        src_y += src_h - 1;
                } else if (rotation & DRM_MODE_REFLECT_X) {
                        src_x += src_w - 1;
                }
        }

        plane_state->color_plane[0].offset = offset;
        plane_state->color_plane[0].x = src_x;
        plane_state->color_plane[0].y = src_y;

        return 0;
}

static bool i9xx_plane_has_windowing(struct intel_plane *plane)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;

        if (IS_CHERRYVIEW(dev_priv))
                return i9xx_plane == PLANE_B;
        else if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                return false;
        else if (IS_GEN(dev_priv, 4))
                return i9xx_plane == PLANE_C;
        else
                return i9xx_plane == PLANE_B ||
                        i9xx_plane == PLANE_C;
}

static int
i9xx_plane_check(struct intel_crtc_state *crtc_state,
                 struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        int ret;

        ret = chv_plane_check_rotation(plane_state);
        if (ret)
                return ret;

        ret = drm_atomic_helper_check_plane_state(&plane_state->uapi,
                                                  &crtc_state->uapi,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  i9xx_plane_has_windowing(plane),
                                                  true);
        if (ret)
                return ret;

        ret = i9xx_check_plane_surface(plane_state);
        if (ret)
                return ret;

        if (!plane_state->uapi.visible)
                return 0;

        ret = intel_plane_check_src_coordinates(plane_state);
        if (ret)
                return ret;

        plane_state->ctl = i9xx_plane_ctl(crtc_state, plane_state);

        return 0;
}

static void i9xx_update_plane(struct intel_plane *plane,
                              const struct intel_crtc_state *crtc_state,
                              const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        u32 linear_offset;
        int x = plane_state->color_plane[0].x;
        int y = plane_state->color_plane[0].y;
        int crtc_x = plane_state->uapi.dst.x1;
        int crtc_y = plane_state->uapi.dst.y1;
        int crtc_w = drm_rect_width(&plane_state->uapi.dst);
        int crtc_h = drm_rect_height(&plane_state->uapi.dst);
        unsigned long irqflags;
        u32 dspaddr_offset;
        u32 dspcntr;

        dspcntr = plane_state->ctl | i9xx_plane_ctl_crtc(crtc_state);

        linear_offset = intel_fb_xy_to_linear(x, y, plane_state, 0);

        if (INTEL_GEN(dev_priv) >= 4)
                dspaddr_offset = plane_state->color_plane[0].offset;
        else
                dspaddr_offset = linear_offset;

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        intel_de_write_fw(dev_priv, DSPSTRIDE(i9xx_plane),
                          plane_state->color_plane[0].stride);

        if (INTEL_GEN(dev_priv) < 4) {
                /*
                 * PLANE_A doesn't actually have a full window
                 * generator but let's assume we still need to
                 * program whatever is there.
                 */
                intel_de_write_fw(dev_priv, DSPPOS(i9xx_plane),
                                  (crtc_y << 16) | crtc_x);
                intel_de_write_fw(dev_priv, DSPSIZE(i9xx_plane),
                                  ((crtc_h - 1) << 16) | (crtc_w - 1));
        } else if (IS_CHERRYVIEW(dev_priv) && i9xx_plane == PLANE_B) {
                intel_de_write_fw(dev_priv, PRIMPOS(i9xx_plane),
                                  (crtc_y << 16) | crtc_x);
                intel_de_write_fw(dev_priv, PRIMSIZE(i9xx_plane),
                                  ((crtc_h - 1) << 16) | (crtc_w - 1));
                intel_de_write_fw(dev_priv, PRIMCNSTALPHA(i9xx_plane), 0);
        }

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                intel_de_write_fw(dev_priv, DSPOFFSET(i9xx_plane),
                                  (y << 16) | x);
        } else if (INTEL_GEN(dev_priv) >= 4) {
                intel_de_write_fw(dev_priv, DSPLINOFF(i9xx_plane),
                                  linear_offset);
                intel_de_write_fw(dev_priv, DSPTILEOFF(i9xx_plane),
                                  (y << 16) | x);
        }

        /*
         * The control register self-arms if the plane was previously
         * disabled. Try to make the plane enable atomic by writing
         * the control register just before the surface register.
         */
        intel_de_write_fw(dev_priv, DSPCNTR(i9xx_plane), dspcntr);
        if (INTEL_GEN(dev_priv) >= 4)
                intel_de_write_fw(dev_priv, DSPSURF(i9xx_plane),
                                  intel_plane_ggtt_offset(plane_state) + dspaddr_offset);
        else
                intel_de_write_fw(dev_priv, DSPADDR(i9xx_plane),
                                  intel_plane_ggtt_offset(plane_state) + dspaddr_offset);

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void i9xx_disable_plane(struct intel_plane *plane,
                               const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        unsigned long irqflags;
        u32 dspcntr;

        /*
         * DSPCNTR pipe gamma enable on g4x+ and pipe csc
         * enable on ilk+ affect the pipe bottom color as
         * well, so we must configure them even if the plane
         * is disabled.
         *
         * On pre-g4x there is no way to gamma correct the
         * pipe bottom color but we'll keep on doing this
         * anyway so that the crtc state readout works correctly.
         */
        dspcntr = i9xx_plane_ctl_crtc(crtc_state);

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        intel_de_write_fw(dev_priv, DSPCNTR(i9xx_plane), dspcntr);
        if (INTEL_GEN(dev_priv) >= 4)
                intel_de_write_fw(dev_priv, DSPSURF(i9xx_plane), 0);
        else
                intel_de_write_fw(dev_priv, DSPADDR(i9xx_plane), 0);

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static bool i9xx_plane_get_hw_state(struct intel_plane *plane,
                                    enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum intel_display_power_domain power_domain;
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        intel_wakeref_t wakeref;
        bool ret;
        u32 val;

        /*
         * Not 100% correct for planes that can move between pipes,
         * but that's only the case for gen2-4 which don't have any
         * display power wells.
         */
        power_domain = POWER_DOMAIN_PIPE(plane->pipe);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        val = intel_de_read(dev_priv, DSPCNTR(i9xx_plane));

        ret = val & DISPLAY_PLANE_ENABLE;

        if (INTEL_GEN(dev_priv) >= 5)
                *pipe = plane->pipe;
        else
                *pipe = (val & DISPPLANE_SEL_PIPE_MASK) >>
                        DISPPLANE_SEL_PIPE_SHIFT;

        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

static void skl_detach_scaler(struct intel_crtc *intel_crtc, int id)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        intel_de_write_fw(dev_priv, SKL_PS_CTRL(intel_crtc->pipe, id), 0);
        intel_de_write_fw(dev_priv, SKL_PS_WIN_POS(intel_crtc->pipe, id), 0);
        intel_de_write_fw(dev_priv, SKL_PS_WIN_SZ(intel_crtc->pipe, id), 0);

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

/*
 * This function detaches (aka. unbinds) unused scalers in hardware
 */
static void skl_detach_scalers(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->uapi.crtc);
        const struct intel_crtc_scaler_state *scaler_state =
                &crtc_state->scaler_state;
        int i;

        /* loop through and disable scalers that aren't in use */
        for (i = 0; i < intel_crtc->num_scalers; i++) {
                if (!scaler_state->scalers[i].in_use)
                        skl_detach_scaler(intel_crtc, i);
        }
}

static unsigned int skl_plane_stride_mult(const struct drm_framebuffer *fb,
                                          int color_plane, unsigned int rotation)
{
        /*
         * The stride is either expressed as a multiple of 64 bytes chunks for
         * linear buffers or in number of tiles for tiled buffers.
         */
        if (is_surface_linear(fb, color_plane))
                return 64;
        else if (drm_rotation_90_or_270(rotation))
                return intel_tile_height(fb, color_plane);
        else
                return intel_tile_width_bytes(fb, color_plane);
}

u32 skl_plane_stride(const struct intel_plane_state *plane_state,
                     int color_plane)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int rotation = plane_state->hw.rotation;
        u32 stride = plane_state->color_plane[color_plane].stride;

        if (color_plane >= fb->format->num_planes)
                return 0;

        return stride / skl_plane_stride_mult(fb, color_plane, rotation);
}

static u32 skl_plane_ctl_format(u32 pixel_format)
{
        switch (pixel_format) {
        case DRM_FORMAT_C8:
                return PLANE_CTL_FORMAT_INDEXED;
        case DRM_FORMAT_RGB565:
                return PLANE_CTL_FORMAT_RGB_565;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ABGR8888:
                return PLANE_CTL_FORMAT_XRGB_8888 | PLANE_CTL_ORDER_RGBX;
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                return PLANE_CTL_FORMAT_XRGB_8888;
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ABGR2101010:
                return PLANE_CTL_FORMAT_XRGB_2101010 | PLANE_CTL_ORDER_RGBX;
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_ARGB2101010:
                return PLANE_CTL_FORMAT_XRGB_2101010;
        case DRM_FORMAT_XBGR16161616F:
        case DRM_FORMAT_ABGR16161616F:
                return PLANE_CTL_FORMAT_XRGB_16161616F | PLANE_CTL_ORDER_RGBX;
        case DRM_FORMAT_XRGB16161616F:
        case DRM_FORMAT_ARGB16161616F:
                return PLANE_CTL_FORMAT_XRGB_16161616F;
        case DRM_FORMAT_XYUV8888:
                return PLANE_CTL_FORMAT_XYUV;
        case DRM_FORMAT_YUYV:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YUYV;
        case DRM_FORMAT_YVYU:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YVYU;
        case DRM_FORMAT_UYVY:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_UYVY;
        case DRM_FORMAT_VYUY:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_VYUY;
        case DRM_FORMAT_NV12:
                return PLANE_CTL_FORMAT_NV12;
        case DRM_FORMAT_P010:
                return PLANE_CTL_FORMAT_P010;
        case DRM_FORMAT_P012:
                return PLANE_CTL_FORMAT_P012;
        case DRM_FORMAT_P016:
                return PLANE_CTL_FORMAT_P016;
        case DRM_FORMAT_Y210:
                return PLANE_CTL_FORMAT_Y210;
        case DRM_FORMAT_Y212:
                return PLANE_CTL_FORMAT_Y212;
        case DRM_FORMAT_Y216:
                return PLANE_CTL_FORMAT_Y216;
        case DRM_FORMAT_XVYU2101010:
                return PLANE_CTL_FORMAT_Y410;
        case DRM_FORMAT_XVYU12_16161616:
                return PLANE_CTL_FORMAT_Y412;
        case DRM_FORMAT_XVYU16161616:
                return PLANE_CTL_FORMAT_Y416;
        default:
                MISSING_CASE(pixel_format);
        }

        return 0;
}

static u32 skl_plane_ctl_alpha(const struct intel_plane_state *plane_state)
{
        if (!plane_state->hw.fb->format->has_alpha)
                return PLANE_CTL_ALPHA_DISABLE;

        switch (plane_state->hw.pixel_blend_mode) {
        case DRM_MODE_BLEND_PIXEL_NONE:
                return PLANE_CTL_ALPHA_DISABLE;
        case DRM_MODE_BLEND_PREMULTI:
                return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
        case DRM_MODE_BLEND_COVERAGE:
                return PLANE_CTL_ALPHA_HW_PREMULTIPLY;
        default:
                MISSING_CASE(plane_state->hw.pixel_blend_mode);
                return PLANE_CTL_ALPHA_DISABLE;
        }
}

static u32 glk_plane_color_ctl_alpha(const struct intel_plane_state *plane_state)
{
        if (!plane_state->hw.fb->format->has_alpha)
                return PLANE_COLOR_ALPHA_DISABLE;

        switch (plane_state->hw.pixel_blend_mode) {
        case DRM_MODE_BLEND_PIXEL_NONE:
                return PLANE_COLOR_ALPHA_DISABLE;
        case DRM_MODE_BLEND_PREMULTI:
                return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
        case DRM_MODE_BLEND_COVERAGE:
                return PLANE_COLOR_ALPHA_HW_PREMULTIPLY;
        default:
                MISSING_CASE(plane_state->hw.pixel_blend_mode);
                return PLANE_COLOR_ALPHA_DISABLE;
        }
}

static u32 skl_plane_ctl_tiling(u64 fb_modifier)
{
        switch (fb_modifier) {
        case DRM_FORMAT_MOD_LINEAR:
                break;
        case I915_FORMAT_MOD_X_TILED:
                return PLANE_CTL_TILED_X;
        case I915_FORMAT_MOD_Y_TILED:
                return PLANE_CTL_TILED_Y;
        case I915_FORMAT_MOD_Y_TILED_CCS:
                return PLANE_CTL_TILED_Y | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
                return PLANE_CTL_TILED_Y |
                       PLANE_CTL_RENDER_DECOMPRESSION_ENABLE |
                       PLANE_CTL_CLEAR_COLOR_DISABLE;
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                return PLANE_CTL_TILED_Y | PLANE_CTL_MEDIA_DECOMPRESSION_ENABLE;
        case I915_FORMAT_MOD_Yf_TILED:
                return PLANE_CTL_TILED_YF;
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                return PLANE_CTL_TILED_YF | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
        default:
                MISSING_CASE(fb_modifier);
        }

        return 0;
}

static u32 skl_plane_ctl_rotate(unsigned int rotate)
{
        switch (rotate) {
        case DRM_MODE_ROTATE_0:
                break;
        /*
         * DRM_MODE_ROTATE_ is counter clockwise to stay compatible with Xrandr
         * while i915 HW rotation is clockwise, thats why this swapping.
         */
        case DRM_MODE_ROTATE_90:
                return PLANE_CTL_ROTATE_270;
        case DRM_MODE_ROTATE_180:
                return PLANE_CTL_ROTATE_180;
        case DRM_MODE_ROTATE_270:
                return PLANE_CTL_ROTATE_90;
        default:
                MISSING_CASE(rotate);
        }

        return 0;
}

static u32 cnl_plane_ctl_flip(unsigned int reflect)
{
        switch (reflect) {
        case 0:
                break;
        case DRM_MODE_REFLECT_X:
                return PLANE_CTL_FLIP_HORIZONTAL;
        case DRM_MODE_REFLECT_Y:
        default:
                MISSING_CASE(reflect);
        }

        return 0;
}

u32 skl_plane_ctl_crtc(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
        u32 plane_ctl = 0;

        if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
                return plane_ctl;

        if (crtc_state->gamma_enable)
                plane_ctl |= PLANE_CTL_PIPE_GAMMA_ENABLE;

        if (crtc_state->csc_enable)
                plane_ctl |= PLANE_CTL_PIPE_CSC_ENABLE;

        return plane_ctl;
}

u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
                  const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        unsigned int rotation = plane_state->hw.rotation;
        const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
        u32 plane_ctl;

        plane_ctl = PLANE_CTL_ENABLE;

        if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
                plane_ctl |= skl_plane_ctl_alpha(plane_state);
                plane_ctl |= PLANE_CTL_PLANE_GAMMA_DISABLE;

                if (plane_state->hw.color_encoding == DRM_COLOR_YCBCR_BT709)
                        plane_ctl |= PLANE_CTL_YUV_TO_RGB_CSC_FORMAT_BT709;

                if (plane_state->hw.color_range == DRM_COLOR_YCBCR_FULL_RANGE)
                        plane_ctl |= PLANE_CTL_YUV_RANGE_CORRECTION_DISABLE;
        }

        plane_ctl |= skl_plane_ctl_format(fb->format->format);
        plane_ctl |= skl_plane_ctl_tiling(fb->modifier);
        plane_ctl |= skl_plane_ctl_rotate(rotation & DRM_MODE_ROTATE_MASK);

        if (INTEL_GEN(dev_priv) >= 10)
                plane_ctl |= cnl_plane_ctl_flip(rotation &
                                                DRM_MODE_REFLECT_MASK);

        if (key->flags & I915_SET_COLORKEY_DESTINATION)
                plane_ctl |= PLANE_CTL_KEY_ENABLE_DESTINATION;
        else if (key->flags & I915_SET_COLORKEY_SOURCE)
                plane_ctl |= PLANE_CTL_KEY_ENABLE_SOURCE;

        return plane_ctl;
}

u32 glk_plane_color_ctl_crtc(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
        u32 plane_color_ctl = 0;

        if (INTEL_GEN(dev_priv) >= 11)
                return plane_color_ctl;

        if (crtc_state->gamma_enable)
                plane_color_ctl |= PLANE_COLOR_PIPE_GAMMA_ENABLE;

        if (crtc_state->csc_enable)
                plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;

        return plane_color_ctl;
}

u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
                        const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        u32 plane_color_ctl = 0;

        plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
        plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);

        if (fb->format->is_yuv && !icl_is_hdr_plane(dev_priv, plane->id)) {
                switch (plane_state->hw.color_encoding) {
                case DRM_COLOR_YCBCR_BT709:
                        plane_color_ctl |= PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709;
                        break;
                case DRM_COLOR_YCBCR_BT2020:
                        plane_color_ctl |=
                                PLANE_COLOR_CSC_MODE_YUV2020_TO_RGB2020;
                        break;
                default:
                        plane_color_ctl |=
                                PLANE_COLOR_CSC_MODE_YUV601_TO_RGB601;
                }
                if (plane_state->hw.color_range == DRM_COLOR_YCBCR_FULL_RANGE)
                        plane_color_ctl |= PLANE_COLOR_YUV_RANGE_CORRECTION_DISABLE;
        } else if (fb->format->is_yuv) {
                plane_color_ctl |= PLANE_COLOR_INPUT_CSC_ENABLE;
        }

        return plane_color_ctl;
}

static int
__intel_display_resume(struct drm_device *dev,
                       struct drm_atomic_state *state,
                       struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_crtc_state *crtc_state;
        struct drm_crtc *crtc;
        int i, ret;

        intel_modeset_setup_hw_state(dev, ctx);
        intel_vga_redisable(to_i915(dev));

        if (!state)
                return 0;

        /*
         * We've duplicated the state, pointers to the old state are invalid.
         *
         * Don't attempt to use the old state until we commit the duplicated state.
         */
        for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
                /*
                 * Force recalculation even if we restore
                 * current state. With fast modeset this may not result
                 * in a modeset when the state is compatible.
                 */
                crtc_state->mode_changed = true;
        }

        /* ignore any reset values/BIOS leftovers in the WM registers */
        if (!HAS_GMCH(to_i915(dev)))
                to_intel_atomic_state(state)->skip_intermediate_wm = true;

        ret = drm_atomic_helper_commit_duplicated_state(state, ctx);

        drm_WARN_ON(dev, ret == -EDEADLK);
        return ret;
}

static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
{
        return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display &&
                intel_has_gpu_reset(&dev_priv->gt));
}

void intel_prepare_reset(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
        struct drm_atomic_state *state;
        int ret;

        /* reset doesn't touch the display */
        if (!dev_priv->params.force_reset_modeset_test &&
            !gpu_reset_clobbers_display(dev_priv))
                return;

        /* We have a modeset vs reset deadlock, defensively unbreak it. */
        set_bit(I915_RESET_MODESET, &dev_priv->gt.reset.flags);
        smp_mb__after_atomic();
        wake_up_bit(&dev_priv->gt.reset.flags, I915_RESET_MODESET);

        if (atomic_read(&dev_priv->gpu_error.pending_fb_pin)) {
                drm_dbg_kms(&dev_priv->drm,
                            "Modeset potentially stuck, unbreaking through wedging\n");
                intel_gt_set_wedged(&dev_priv->gt);
        }

        /*
         * Need mode_config.mutex so that we don't
         * trample ongoing ->detect() and whatnot.
         */
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_acquire_init(ctx, 0);
        while (1) {
                ret = drm_modeset_lock_all_ctx(dev, ctx);
                if (ret != -EDEADLK)
                        break;

                drm_modeset_backoff(ctx);
        }
        /*
         * Disabling the crtcs gracefully seems nicer. Also the
         * g33 docs say we should at least disable all the planes.
         */
        state = drm_atomic_helper_duplicate_state(dev, ctx);
        if (IS_ERR(state)) {
                ret = PTR_ERR(state);
                drm_err(&dev_priv->drm, "Duplicating state failed with %i\n",
                        ret);
                return;
        }

        ret = drm_atomic_helper_disable_all(dev, ctx);
        if (ret) {
                drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
                        ret);
                drm_atomic_state_put(state);
                return;
        }

        dev_priv->modeset_restore_state = state;
        state->acquire_ctx = ctx;
}

void intel_finish_reset(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
        struct drm_atomic_state *state;
        int ret;

        /* reset doesn't touch the display */
        if (!test_bit(I915_RESET_MODESET, &dev_priv->gt.reset.flags))
                return;

        state = fetch_and_zero(&dev_priv->modeset_restore_state);
        if (!state)
                goto unlock;

        /* reset doesn't touch the display */
        if (!gpu_reset_clobbers_display(dev_priv)) {
                /* for testing only restore the display */
                ret = __intel_display_resume(dev, state, ctx);
                if (ret)
                        drm_err(&dev_priv->drm,
                                "Restoring old state failed with %i\n", ret);
        } else {
                /*
                 * The display has been reset as well,
                 * so need a full re-initialization.
                 */
                intel_pps_unlock_regs_wa(dev_priv);
                intel_modeset_init_hw(dev_priv);
                intel_init_clock_gating(dev_priv);

                spin_lock_irq(&dev_priv->irq_lock);
                if (dev_priv->display.hpd_irq_setup)
                        dev_priv->display.hpd_irq_setup(dev_priv);
                spin_unlock_irq(&dev_priv->irq_lock);

                ret = __intel_display_resume(dev, state, ctx);
                if (ret)
                        drm_err(&dev_priv->drm,
                                "Restoring old state failed with %i\n", ret);

                intel_hpd_init(dev_priv);
        }

        drm_atomic_state_put(state);
unlock:
        drm_modeset_drop_locks(ctx);
        drm_modeset_acquire_fini(ctx);
        mutex_unlock(&dev->mode_config.mutex);

        clear_bit_unlock(I915_RESET_MODESET, &dev_priv->gt.reset.flags);
}

static void icl_set_pipe_chicken(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPE_CHICKEN(pipe));

        /*
         * Display WA #1153: icl
         * enable hardware to bypass the alpha math
         * and rounding for per-pixel values 00 and 0xff
         */
        tmp |= PER_PIXEL_ALPHA_BYPASS_EN;
        /*
         * Display WA # 1605353570: icl
         * Set the pixel rounding bit to 1 for allowing
         * passthrough of Frame buffer pixels unmodified
         * across pipe
         */
        tmp |= PIXEL_ROUNDING_TRUNC_FB_PASSTHRU;
        intel_de_write(dev_priv, PIPE_CHICKEN(pipe), tmp);
}

static void intel_fdi_normal_train(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* enable normal train */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        if (IS_IVYBRIDGE(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_NONE_IVB;
                temp |= FDI_LINK_TRAIN_NONE_IVB | FDI_TX_ENHANCE_FRAME_ENABLE;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
        }
        intel_de_write(dev_priv, reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_NORMAL_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_NONE;
        }
        intel_de_write(dev_priv, reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);

        /* wait one idle pattern time */
        intel_de_posting_read(dev_priv, reg);
        udelay(1000);

        /* IVB wants error correction enabled */
        if (IS_IVYBRIDGE(dev_priv))
                intel_de_write(dev_priv, reg,
                               intel_de_read(dev_priv, reg) | FDI_FS_ERRC_ENABLE | FDI_FE_ERRC_ENABLE);
}

/* The FDI link training functions for ILK/Ibexpeak. */
static void ilk_fdi_link_train(struct intel_crtc *crtc,
                               const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp, tries;

        /* FDI needs bits from pipe first */
        assert_pipe_enabled(dev_priv, crtc_state->cpu_transcoder);

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        intel_de_write(dev_priv, reg, temp);
        intel_de_read(dev_priv, reg);
        udelay(150);

        /* enable CPU FDI TX and PCH FDI RX */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_DP_PORT_WIDTH_MASK;
        temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        intel_de_write(dev_priv, reg, temp | FDI_TX_ENABLE);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        intel_de_write(dev_priv, reg, temp | FDI_RX_ENABLE);

        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        /* Ironlake workaround, enable clock pointer after FDI enable*/
        intel_de_write(dev_priv, FDI_RX_CHICKEN(pipe),
                       FDI_RX_PHASE_SYNC_POINTER_OVR);
        intel_de_write(dev_priv, FDI_RX_CHICKEN(pipe),
                       FDI_RX_PHASE_SYNC_POINTER_OVR | FDI_RX_PHASE_SYNC_POINTER_EN);

        reg = FDI_RX_IIR(pipe);
        for (tries = 0; tries < 5; tries++) {
                temp = intel_de_read(dev_priv, reg);
                drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR 0x%x\n", temp);

                if ((temp & FDI_RX_BIT_LOCK)) {
                        drm_dbg_kms(&dev_priv->drm, "FDI train 1 done.\n");
                        intel_de_write(dev_priv, reg, temp | FDI_RX_BIT_LOCK);
                        break;
                }
        }
        if (tries == 5)
                drm_err(&dev_priv->drm, "FDI train 1 fail!\n");

        /* Train 2 */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        intel_de_write(dev_priv, reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        intel_de_write(dev_priv, reg, temp);

        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        reg = FDI_RX_IIR(pipe);
        for (tries = 0; tries < 5; tries++) {
                temp = intel_de_read(dev_priv, reg);
                drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR 0x%x\n", temp);

                if (temp & FDI_RX_SYMBOL_LOCK) {
                        intel_de_write(dev_priv, reg,
                                       temp | FDI_RX_SYMBOL_LOCK);
                        drm_dbg_kms(&dev_priv->drm, "FDI train 2 done.\n");
                        break;
                }
        }
        if (tries == 5)
                drm_err(&dev_priv->drm, "FDI train 2 fail!\n");

        drm_dbg_kms(&dev_priv->drm, "FDI train done\n");

}

static const int snb_b_fdi_train_param[] = {
        FDI_LINK_TRAIN_400MV_0DB_SNB_B,
        FDI_LINK_TRAIN_400MV_6DB_SNB_B,
        FDI_LINK_TRAIN_600MV_3_5DB_SNB_B,
        FDI_LINK_TRAIN_800MV_0DB_SNB_B,
};

/* The FDI link training functions for SNB/Cougarpoint. */
static void gen6_fdi_link_train(struct intel_crtc *crtc,
                                const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp, i, retry;

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        intel_de_write(dev_priv, reg, temp);

        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        /* enable CPU FDI TX and PCH FDI RX */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_DP_PORT_WIDTH_MASK;
        temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
        /* SNB-B */
        temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
        intel_de_write(dev_priv, reg, temp | FDI_TX_ENABLE);

        intel_de_write(dev_priv, FDI_RX_MISC(pipe),
                       FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_1;
        }
        intel_de_write(dev_priv, reg, temp | FDI_RX_ENABLE);

        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        for (i = 0; i < 4; i++) {
                reg = FDI_TX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[i];
                intel_de_write(dev_priv, reg, temp);

                intel_de_posting_read(dev_priv, reg);
                udelay(500);

                for (retry = 0; retry < 5; retry++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = intel_de_read(dev_priv, reg);
                        drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR 0x%x\n", temp);
                        if (temp & FDI_RX_BIT_LOCK) {
                                intel_de_write(dev_priv, reg,
                                               temp | FDI_RX_BIT_LOCK);
                                drm_dbg_kms(&dev_priv->drm,
                                            "FDI train 1 done.\n");
                                break;
                        }
                        udelay(50);
                }
                if (retry < 5)
                        break;
        }
        if (i == 4)
                drm_err(&dev_priv->drm, "FDI train 1 fail!\n");

        /* Train 2 */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        if (IS_GEN(dev_priv, 6)) {
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                /* SNB-B */
                temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
        }
        intel_de_write(dev_priv, reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_2;
        }
        intel_de_write(dev_priv, reg, temp);

        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        for (i = 0; i < 4; i++) {
                reg = FDI_TX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[i];
                intel_de_write(dev_priv, reg, temp);

                intel_de_posting_read(dev_priv, reg);
                udelay(500);

                for (retry = 0; retry < 5; retry++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = intel_de_read(dev_priv, reg);
                        drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR 0x%x\n", temp);
                        if (temp & FDI_RX_SYMBOL_LOCK) {
                                intel_de_write(dev_priv, reg,
                                               temp | FDI_RX_SYMBOL_LOCK);
                                drm_dbg_kms(&dev_priv->drm,
                                            "FDI train 2 done.\n");
                                break;
                        }
                        udelay(50);
                }
                if (retry < 5)
                        break;
        }
        if (i == 4)
                drm_err(&dev_priv->drm, "FDI train 2 fail!\n");

        drm_dbg_kms(&dev_priv->drm, "FDI train done.\n");
}

/* Manual link training for Ivy Bridge A0 parts */
static void ivb_manual_fdi_link_train(struct intel_crtc *crtc,
                                      const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp, i, j;

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        intel_de_write(dev_priv, reg, temp);

        intel_de_posting_read(dev_priv, reg);
        udelay(150);

        drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR before link train 0x%x\n",
                    intel_de_read(dev_priv, FDI_RX_IIR(pipe)));

        /* Try each vswing and preemphasis setting twice before moving on */
        for (j = 0; j < ARRAY_SIZE(snb_b_fdi_train_param) * 2; j++) {
                /* disable first in case we need to retry */
                reg = FDI_TX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~(FDI_LINK_TRAIN_AUTO | FDI_LINK_TRAIN_NONE_IVB);
                temp &= ~FDI_TX_ENABLE;
                intel_de_write(dev_priv, reg, temp);

                reg = FDI_RX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~FDI_LINK_TRAIN_AUTO;
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp &= ~FDI_RX_ENABLE;
                intel_de_write(dev_priv, reg, temp);

                /* enable CPU FDI TX and PCH FDI RX */
                reg = FDI_TX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~FDI_DP_PORT_WIDTH_MASK;
                temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
                temp |= FDI_LINK_TRAIN_PATTERN_1_IVB;
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[j/2];
                temp |= FDI_COMPOSITE_SYNC;
                intel_de_write(dev_priv, reg, temp | FDI_TX_ENABLE);

                intel_de_write(dev_priv, FDI_RX_MISC(pipe),
                               FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

                reg = FDI_RX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
                temp |= FDI_COMPOSITE_SYNC;
                intel_de_write(dev_priv, reg, temp | FDI_RX_ENABLE);

                intel_de_posting_read(dev_priv, reg);
                udelay(1); /* should be 0.5us */

                for (i = 0; i < 4; i++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = intel_de_read(dev_priv, reg);
                        drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR 0x%x\n", temp);

                        if (temp & FDI_RX_BIT_LOCK ||
                            (intel_de_read(dev_priv, reg) & FDI_RX_BIT_LOCK)) {
                                intel_de_write(dev_priv, reg,
                                               temp | FDI_RX_BIT_LOCK);
                                drm_dbg_kms(&dev_priv->drm,
                                            "FDI train 1 done, level %i.\n",
                                            i);
                                break;
                        }
                        udelay(1); /* should be 0.5us */
                }
                if (i == 4) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "FDI train 1 fail on vswing %d\n", j / 2);
                        continue;
                }

                /* Train 2 */
                reg = FDI_TX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~FDI_LINK_TRAIN_NONE_IVB;
                temp |= FDI_LINK_TRAIN_PATTERN_2_IVB;
                intel_de_write(dev_priv, reg, temp);

                reg = FDI_RX_CTL(pipe);
                temp = intel_de_read(dev_priv, reg);
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
                intel_de_write(dev_priv, reg, temp);

                intel_de_posting_read(dev_priv, reg);
                udelay(2); /* should be 1.5us */

                for (i = 0; i < 4; i++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = intel_de_read(dev_priv, reg);
                        drm_dbg_kms(&dev_priv->drm, "FDI_RX_IIR 0x%x\n", temp);

                        if (temp & FDI_RX_SYMBOL_LOCK ||
                            (intel_de_read(dev_priv, reg) & FDI_RX_SYMBOL_LOCK)) {
                                intel_de_write(dev_priv, reg,
                                               temp | FDI_RX_SYMBOL_LOCK);
                                drm_dbg_kms(&dev_priv->drm,
                                            "FDI train 2 done, level %i.\n",
                                            i);
                                goto train_done;
                        }
                        udelay(2); /* should be 1.5us */
                }
                if (i == 4)
                        drm_dbg_kms(&dev_priv->drm,
                                    "FDI train 2 fail on vswing %d\n", j / 2);
        }

train_done:
        drm_dbg_kms(&dev_priv->drm, "FDI train done.\n");
}

static void ilk_fdi_pll_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
        enum pipe pipe = intel_crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* enable PCH FDI RX PLL, wait warmup plus DMI latency */
        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~(FDI_DP_PORT_WIDTH_MASK | (0x7 << 16));
        temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
        temp |= (intel_de_read(dev_priv, PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        intel_de_write(dev_priv, reg, temp | FDI_RX_PLL_ENABLE);

        intel_de_posting_read(dev_priv, reg);
        udelay(200);

        /* Switch from Rawclk to PCDclk */
        temp = intel_de_read(dev_priv, reg);
        intel_de_write(dev_priv, reg, temp | FDI_PCDCLK);

        intel_de_posting_read(dev_priv, reg);
        udelay(200);

        /* Enable CPU FDI TX PLL, always on for Ironlake */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        if ((temp & FDI_TX_PLL_ENABLE) == 0) {
                intel_de_write(dev_priv, reg, temp | FDI_TX_PLL_ENABLE);

                intel_de_posting_read(dev_priv, reg);
                udelay(100);
        }
}

static void ilk_fdi_pll_disable(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = intel_crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* Switch from PCDclk to Rawclk */
        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        intel_de_write(dev_priv, reg, temp & ~FDI_PCDCLK);

        /* Disable CPU FDI TX PLL */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        intel_de_write(dev_priv, reg, temp & ~FDI_TX_PLL_ENABLE);

        intel_de_posting_read(dev_priv, reg);
        udelay(100);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        intel_de_write(dev_priv, reg, temp & ~FDI_RX_PLL_ENABLE);

        /* Wait for the clocks to turn off. */
        intel_de_posting_read(dev_priv, reg);
        udelay(100);
}

static void ilk_fdi_disable(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* disable CPU FDI tx and PCH FDI rx */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        intel_de_write(dev_priv, reg, temp & ~FDI_TX_ENABLE);
        intel_de_posting_read(dev_priv, reg);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~(0x7 << 16);
        temp |= (intel_de_read(dev_priv, PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        intel_de_write(dev_priv, reg, temp & ~FDI_RX_ENABLE);

        intel_de_posting_read(dev_priv, reg);
        udelay(100);

        /* Ironlake workaround, disable clock pointer after downing FDI */
        if (HAS_PCH_IBX(dev_priv))
                intel_de_write(dev_priv, FDI_RX_CHICKEN(pipe),
                               FDI_RX_PHASE_SYNC_POINTER_OVR);

        /* still set train pattern 1 */
        reg = FDI_TX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        intel_de_write(dev_priv, reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = intel_de_read(dev_priv, reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_1;
        }
        /* BPC in FDI rx is consistent with that in PIPECONF */
        temp &= ~(0x07 << 16);
        temp |= (intel_de_read(dev_priv, PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        intel_de_write(dev_priv, reg, temp);

        intel_de_posting_read(dev_priv, reg);
        udelay(100);
}

bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv)
{
        struct drm_crtc *crtc;
        bool cleanup_done;

        drm_for_each_crtc(crtc, &dev_priv->drm) {
                struct drm_crtc_commit *commit;
                spin_lock(&crtc->commit_lock);
                commit = list_first_entry_or_null(&crtc->commit_list,
                                                  struct drm_crtc_commit, commit_entry);
                cleanup_done = commit ?
                        try_wait_for_completion(&commit->cleanup_done) : true;
                spin_unlock(&crtc->commit_lock);

                if (cleanup_done)
                        continue;

                drm_crtc_wait_one_vblank(crtc);

                return true;
        }

        return false;
}

void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
{
        u32 temp;

        intel_de_write(dev_priv, PIXCLK_GATE, PIXCLK_GATE_GATE);

        mutex_lock(&dev_priv->sb_lock);

        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp |= SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

/* Program iCLKIP clock to the desired frequency */
static void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        int clock = crtc_state->hw.adjusted_mode.crtc_clock;
        u32 divsel, phaseinc, auxdiv, phasedir = 0;
        u32 temp;

        lpt_disable_iclkip(dev_priv);

        /* The iCLK virtual clock root frequency is in MHz,
         * but the adjusted_mode->crtc_clock in in KHz. To get the
         * divisors, it is necessary to divide one by another, so we
         * convert the virtual clock precision to KHz here for higher
         * precision.
         */
        for (auxdiv = 0; auxdiv < 2; auxdiv++) {
                u32 iclk_virtual_root_freq = 172800 * 1000;
                u32 iclk_pi_range = 64;
                u32 desired_divisor;

                desired_divisor = DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
                                                    clock << auxdiv);
                divsel = (desired_divisor / iclk_pi_range) - 2;
                phaseinc = desired_divisor % iclk_pi_range;

                /*
                 * Near 20MHz is a corner case which is
                 * out of range for the 7-bit divisor
                 */
                if (divsel <= 0x7f)
                        break;
        }

        /* This should not happen with any sane values */
        drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
                    ~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
        drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIR(phasedir) &
                    ~SBI_SSCDIVINTPHASE_INCVAL_MASK);

        drm_dbg_kms(&dev_priv->drm,
                    "iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
                    clock, auxdiv, divsel, phasedir, phaseinc);

        mutex_lock(&dev_priv->sb_lock);

        /* Program SSCDIVINTPHASE6 */
        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
        temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
        temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
        temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
        temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
        temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE6, temp, SBI_ICLK);

        /* Program SSCAUXDIV */
        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
        temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
        intel_sbi_write(dev_priv, SBI_SSCAUXDIV6, temp, SBI_ICLK);

        /* Enable modulator and associated divider */
        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp &= ~SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);

        /* Wait for initialization time */
        udelay(24);

        intel_de_write(dev_priv, PIXCLK_GATE, PIXCLK_GATE_UNGATE);
}

int lpt_get_iclkip(struct drm_i915_private *dev_priv)
{
        u32 divsel, phaseinc, auxdiv;
        u32 iclk_virtual_root_freq = 172800 * 1000;
        u32 iclk_pi_range = 64;
        u32 desired_divisor;
        u32 temp;

        if ((intel_de_read(dev_priv, PIXCLK_GATE) & PIXCLK_GATE_UNGATE) == 0)
                return 0;

        mutex_lock(&dev_priv->sb_lock);

        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        if (temp & SBI_SSCCTL_DISABLE) {
                mutex_unlock(&dev_priv->sb_lock);
                return 0;
        }

        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        divsel = (temp & SBI_SSCDIVINTPHASE_DIVSEL_MASK) >>
                SBI_SSCDIVINTPHASE_DIVSEL_SHIFT;
        phaseinc = (temp & SBI_SSCDIVINTPHASE_INCVAL_MASK) >>
                SBI_SSCDIVINTPHASE_INCVAL_SHIFT;

        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        auxdiv = (temp & SBI_SSCAUXDIV_FINALDIV2SEL_MASK) >>
                SBI_SSCAUXDIV_FINALDIV2SEL_SHIFT;

        mutex_unlock(&dev_priv->sb_lock);

        desired_divisor = (divsel + 2) * iclk_pi_range + phaseinc;

        return DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
                                 desired_divisor << auxdiv);
}

static void ilk_pch_transcoder_set_timings(const struct intel_crtc_state *crtc_state,
                                           enum pipe pch_transcoder)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        intel_de_write(dev_priv, PCH_TRANS_HTOTAL(pch_transcoder),
                       intel_de_read(dev_priv, HTOTAL(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_HBLANK(pch_transcoder),
                       intel_de_read(dev_priv, HBLANK(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_HSYNC(pch_transcoder),
                       intel_de_read(dev_priv, HSYNC(cpu_transcoder)));

        intel_de_write(dev_priv, PCH_TRANS_VTOTAL(pch_transcoder),
                       intel_de_read(dev_priv, VTOTAL(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_VBLANK(pch_transcoder),
                       intel_de_read(dev_priv, VBLANK(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_VSYNC(pch_transcoder),
                       intel_de_read(dev_priv, VSYNC(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_VSYNCSHIFT(pch_transcoder),
                       intel_de_read(dev_priv, VSYNCSHIFT(cpu_transcoder)));
}

static void cpt_set_fdi_bc_bifurcation(struct drm_i915_private *dev_priv, bool enable)
{
        u32 temp;

        temp = intel_de_read(dev_priv, SOUTH_CHICKEN1);
        if (!!(temp & FDI_BC_BIFURCATION_SELECT) == enable)
                return;

        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, FDI_RX_CTL(PIPE_B)) &
                    FDI_RX_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, FDI_RX_CTL(PIPE_C)) &
                    FDI_RX_ENABLE);

        temp &= ~FDI_BC_BIFURCATION_SELECT;
        if (enable)
                temp |= FDI_BC_BIFURCATION_SELECT;

        drm_dbg_kms(&dev_priv->drm, "%sabling fdi C rx\n",
                    enable ? "en" : "dis");
        intel_de_write(dev_priv, SOUTH_CHICKEN1, temp);
        intel_de_posting_read(dev_priv, SOUTH_CHICKEN1);
}

static void ivb_update_fdi_bc_bifurcation(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        switch (crtc->pipe) {
        case PIPE_A:
                break;
        case PIPE_B:
                if (crtc_state->fdi_lanes > 2)
                        cpt_set_fdi_bc_bifurcation(dev_priv, false);
                else
                        cpt_set_fdi_bc_bifurcation(dev_priv, true);

                break;
        case PIPE_C:
                cpt_set_fdi_bc_bifurcation(dev_priv, true);

                break;
        default:
                BUG();
        }
}

/*
 * Finds the encoder associated with the given CRTC. This can only be
 * used when we know that the CRTC isn't feeding multiple encoders!
 */
static struct intel_encoder *
intel_get_crtc_new_encoder(const struct intel_atomic_state *state,
                           const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        const struct drm_connector_state *connector_state;
        const struct drm_connector *connector;
        struct intel_encoder *encoder = NULL;
        int num_encoders = 0;
        int i;

        for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);
                num_encoders++;
        }

        drm_WARN(encoder->base.dev, num_encoders != 1,
                 "%d encoders for pipe %c\n",
                 num_encoders, pipe_name(crtc->pipe));

        return encoder;
}

/*
 * Enable PCH resources required for PCH ports:
 *   - PCH PLLs
 *   - FDI training & RX/TX
 *   - update transcoder timings
 *   - DP transcoding bits
 *   - transcoder
 */
static void ilk_pch_enable(const struct intel_atomic_state *state,
                           const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        u32 temp;

        assert_pch_transcoder_disabled(dev_priv, pipe);

        if (IS_IVYBRIDGE(dev_priv))
                ivb_update_fdi_bc_bifurcation(crtc_state);

        /* Write the TU size bits before fdi link training, so that error
         * detection works. */
        intel_de_write(dev_priv, FDI_RX_TUSIZE1(pipe),
                       intel_de_read(dev_priv, PIPE_DATA_M1(pipe)) & TU_SIZE_MASK);

        /* For PCH output, training FDI link */
        dev_priv->display.fdi_link_train(crtc, crtc_state);

        /* We need to program the right clock selection before writing the pixel
         * mutliplier into the DPLL. */
        if (HAS_PCH_CPT(dev_priv)) {
                u32 sel;

                temp = intel_de_read(dev_priv, PCH_DPLL_SEL);
                temp |= TRANS_DPLL_ENABLE(pipe);
                sel = TRANS_DPLLB_SEL(pipe);
                if (crtc_state->shared_dpll ==
                    intel_get_shared_dpll_by_id(dev_priv, DPLL_ID_PCH_PLL_B))
                        temp |= sel;
                else
                        temp &= ~sel;
                intel_de_write(dev_priv, PCH_DPLL_SEL, temp);
        }

        /* XXX: pch pll's can be enabled any time before we enable the PCH
         * transcoder, and we actually should do this to not upset any PCH
         * transcoder that already use the clock when we share it.
         *
         * Note that enable_shared_dpll tries to do the right thing, but
         * get_shared_dpll unconditionally resets the pll - we need that to have
         * the right LVDS enable sequence. */
        intel_enable_shared_dpll(crtc_state);

        /* set transcoder timing, panel must allow it */
        assert_panel_unlocked(dev_priv, pipe);
        ilk_pch_transcoder_set_timings(crtc_state, pipe);

        intel_fdi_normal_train(crtc);

        /* For PCH DP, enable TRANS_DP_CTL */
        if (HAS_PCH_CPT(dev_priv) &&
            intel_crtc_has_dp_encoder(crtc_state)) {
                const struct drm_display_mode *adjusted_mode =
                        &crtc_state->hw.adjusted_mode;
                u32 bpc = (intel_de_read(dev_priv, PIPECONF(pipe)) & PIPECONF_BPC_MASK) >> 5;
                i915_reg_t reg = TRANS_DP_CTL(pipe);
                enum port port;

                temp = intel_de_read(dev_priv, reg);
                temp &= ~(TRANS_DP_PORT_SEL_MASK |
                          TRANS_DP_SYNC_MASK |
                          TRANS_DP_BPC_MASK);
                temp |= TRANS_DP_OUTPUT_ENABLE;
                temp |= bpc << 9; /* same format but at 11:9 */

                if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                        temp |= TRANS_DP_HSYNC_ACTIVE_HIGH;
                if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                        temp |= TRANS_DP_VSYNC_ACTIVE_HIGH;

                port = intel_get_crtc_new_encoder(state, crtc_state)->port;
                drm_WARN_ON(dev, port < PORT_B || port > PORT_D);
                temp |= TRANS_DP_PORT_SEL(port);

                intel_de_write(dev_priv, reg, temp);
        }

        ilk_enable_pch_transcoder(crtc_state);
}

void lpt_pch_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        assert_pch_transcoder_disabled(dev_priv, PIPE_A);

        lpt_program_iclkip(crtc_state);

        /* Set transcoder timing. */
        ilk_pch_transcoder_set_timings(crtc_state, PIPE_A);

        lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
}

static void cpt_verify_modeset(struct drm_i915_private *dev_priv,
                               enum pipe pipe)
{
        i915_reg_t dslreg = PIPEDSL(pipe);
        u32 temp;

        temp = intel_de_read(dev_priv, dslreg);
        udelay(500);
        if (wait_for(intel_de_read(dev_priv, dslreg) != temp, 5)) {
                if (wait_for(intel_de_read(dev_priv, dslreg) != temp, 5))
                        drm_err(&dev_priv->drm,
                                "mode set failed: pipe %c stuck\n",
                                pipe_name(pipe));
        }
}

/*
 * The hardware phase 0.0 refers to the center of the pixel.
 * We want to start from the top/left edge which is phase
 * -0.5. That matches how the hardware calculates the scaling
 * factors (from top-left of the first pixel to bottom-right
 * of the last pixel, as opposed to the pixel centers).
 *
 * For 4:2:0 subsampled chroma planes we obviously have to
 * adjust that so that the chroma sample position lands in
 * the right spot.
 *
 * Note that for packed YCbCr 4:2:2 formats there is no way to
 * control chroma siting. The hardware simply replicates the
 * chroma samples for both of the luma samples, and thus we don't
 * actually get the expected MPEG2 chroma siting convention :(
 * The same behaviour is observed on pre-SKL platforms as well.
 *
 * Theory behind the formula (note that we ignore sub-pixel
 * source coordinates):
 * s = source sample position
 * d = destination sample position
 *
 * Downscaling 4:1:
 * -0.5
 * | 0.0
 * | |     1.5 (initial phase)
 * | |     |
 * v v     v
 * | s | s | s | s |
 * |       d       |
 *
 * Upscaling 1:4:
 * -0.5
 * | -0.375 (initial phase)
 * | |     0.0
 * | |     |
 * v v     v
 * |       s       |
 * | d | d | d | d |
 */
u16 skl_scaler_calc_phase(int sub, int scale, bool chroma_cosited)
{
        int phase = -0x8000;
        u16 trip = 0;

        if (chroma_cosited)
                phase += (sub - 1) * 0x8000 / sub;

        phase += scale / (2 * sub);

        /*
         * Hardware initial phase limited to [-0.5:1.5].
         * Since the max hardware scale factor is 3.0, we
         * should never actually excdeed 1.0 here.
         */
        WARN_ON(phase < -0x8000 || phase > 0x18000);

        if (phase < 0)
                phase = 0x10000 + phase;
        else
                trip = PS_PHASE_TRIP;

        return ((phase >> 2) & PS_PHASE_MASK) | trip;
}

#define SKL_MIN_SRC_W 8
#define SKL_MAX_SRC_W 4096
#define SKL_MIN_SRC_H 8
#define SKL_MAX_SRC_H 4096
#define SKL_MIN_DST_W 8
#define SKL_MAX_DST_W 4096
#define SKL_MIN_DST_H 8
#define SKL_MAX_DST_H 4096
#define ICL_MAX_SRC_W 5120
#define ICL_MAX_SRC_H 4096
#define ICL_MAX_DST_W 5120
#define ICL_MAX_DST_H 4096
#define SKL_MIN_YUV_420_SRC_W 16
#define SKL_MIN_YUV_420_SRC_H 16

static int
skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
                  unsigned int scaler_user, int *scaler_id,
                  int src_w, int src_h, int dst_w, int dst_h,
                  const struct drm_format_info *format,
                  u64 modifier, bool need_scaler)
{
        struct intel_crtc_scaler_state *scaler_state =
                &crtc_state->scaler_state;
        struct intel_crtc *intel_crtc =
                to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;

        /*
         * Src coordinates are already rotated by 270 degrees for
         * the 90/270 degree plane rotation cases (to match the
         * GTT mapping), hence no need to account for rotation here.
         */
        if (src_w != dst_w || src_h != dst_h)
                need_scaler = true;

        /*
         * Scaling/fitting not supported in IF-ID mode in GEN9+
         * TODO: Interlace fetch mode doesn't support YUV420 planar formats.
         * Once NV12 is enabled, handle it here while allocating scaler
         * for NV12.
         */
        if (INTEL_GEN(dev_priv) >= 9 && crtc_state->hw.enable &&
            need_scaler && adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
                drm_dbg_kms(&dev_priv->drm,
                            "Pipe/Plane scaling not supported with IF-ID mode\n");
                return -EINVAL;
        }

        /*
         * if plane is being disabled or scaler is no more required or force detach
         *  - free scaler binded to this plane/crtc
         *  - in order to do this, update crtc->scaler_usage
         *
         * Here scaler state in crtc_state is set free so that
         * scaler can be assigned to other user. Actual register
         * update to free the scaler is done in plane/panel-fit programming.
         * For this purpose crtc/plane_state->scaler_id isn't reset here.
         */
        if (force_detach || !need_scaler) {
                if (*scaler_id >= 0) {
                        scaler_state->scaler_users &= ~(1 << scaler_user);
                        scaler_state->scalers[*scaler_id].in_use = 0;

                        drm_dbg_kms(&dev_priv->drm,
                                    "scaler_user index %u.%u: "
                                    "Staged freeing scaler id %d scaler_users = 0x%x\n",
                                    intel_crtc->pipe, scaler_user, *scaler_id,
                                    scaler_state->scaler_users);
                        *scaler_id = -1;
                }
                return 0;
        }

        if (format && intel_format_info_is_yuv_semiplanar(format, modifier) &&
            (src_h < SKL_MIN_YUV_420_SRC_H || src_w < SKL_MIN_YUV_420_SRC_W)) {
                drm_dbg_kms(&dev_priv->drm,
                            "Planar YUV: src dimensions not met\n");
                return -EINVAL;
        }

        /* range checks */
        if (src_w < SKL_MIN_SRC_W || src_h < SKL_MIN_SRC_H ||
            dst_w < SKL_MIN_DST_W || dst_h < SKL_MIN_DST_H ||
            (INTEL_GEN(dev_priv) >= 11 &&
             (src_w > ICL_MAX_SRC_W || src_h > ICL_MAX_SRC_H ||
              dst_w > ICL_MAX_DST_W || dst_h > ICL_MAX_DST_H)) ||
            (INTEL_GEN(dev_priv) < 11 &&
             (src_w > SKL_MAX_SRC_W || src_h > SKL_MAX_SRC_H ||
              dst_w > SKL_MAX_DST_W || dst_h > SKL_MAX_DST_H))) {
                drm_dbg_kms(&dev_priv->drm,
                            "scaler_user index %u.%u: src %ux%u dst %ux%u "
                            "size is out of scaler range\n",
                            intel_crtc->pipe, scaler_user, src_w, src_h,
                            dst_w, dst_h);
                return -EINVAL;
        }

        /* mark this plane as a scaler user in crtc_state */
        scaler_state->scaler_users |= (1 << scaler_user);
        drm_dbg_kms(&dev_priv->drm, "scaler_user index %u.%u: "
                    "staged scaling request for %ux%u->%ux%u scaler_users = 0x%x\n",
                    intel_crtc->pipe, scaler_user, src_w, src_h, dst_w, dst_h,
                    scaler_state->scaler_users);

        return 0;
}

static int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state)
{
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;
        int width, height;

        if (crtc_state->pch_pfit.enabled) {
                width = drm_rect_width(&crtc_state->pch_pfit.dst);
                height = drm_rect_height(&crtc_state->pch_pfit.dst);
        } else {
                width = adjusted_mode->crtc_hdisplay;
                height = adjusted_mode->crtc_vdisplay;
        }

        return skl_update_scaler(crtc_state, !crtc_state->hw.active,
                                 SKL_CRTC_INDEX,
                                 &crtc_state->scaler_state.scaler_id,
                                 crtc_state->pipe_src_w, crtc_state->pipe_src_h,
                                 width, height, NULL, 0,
                                 crtc_state->pch_pfit.enabled);
}

/**
 * skl_update_scaler_plane - Stages update to scaler state for a given plane.
 * @crtc_state: crtc's scaler state
 * @plane_state: atomic plane state to update
 *
 * Return
 *     0 - scaler_usage updated successfully
 *    error - requested scaling cannot be supported or other error condition
 */
static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
                                   struct intel_plane_state *plane_state)
{
        struct intel_plane *intel_plane =
                to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(intel_plane->base.dev);
        struct drm_framebuffer *fb = plane_state->hw.fb;
        int ret;
        bool force_detach = !fb || !plane_state->uapi.visible;
        bool need_scaler = false;

        /* Pre-gen11 and SDR planes always need a scaler for planar formats. */
        if (!icl_is_hdr_plane(dev_priv, intel_plane->id) &&
            fb && intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
                need_scaler = true;

        ret = skl_update_scaler(crtc_state, force_detach,
                                drm_plane_index(&intel_plane->base),
                                &plane_state->scaler_id,
                                drm_rect_width(&plane_state->uapi.src) >> 16,
                                drm_rect_height(&plane_state->uapi.src) >> 16,
                                drm_rect_width(&plane_state->uapi.dst),
                                drm_rect_height(&plane_state->uapi.dst),
                                fb ? fb->format : NULL,
                                fb ? fb->modifier : 0,
                                need_scaler);

        if (ret || plane_state->scaler_id < 0)
                return ret;

        /* check colorkey */
        if (plane_state->ckey.flags) {
                drm_dbg_kms(&dev_priv->drm,
                            "[PLANE:%d:%s] scaling with color key not allowed",
                            intel_plane->base.base.id,
                            intel_plane->base.name);
                return -EINVAL;
        }

        /* Check src format */
        switch (fb->format->format) {
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ABGR8888:
        case DRM_FORMAT_ARGB8888:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ARGB2101010:
        case DRM_FORMAT_ABGR2101010:
        case DRM_FORMAT_YUYV:
        case DRM_FORMAT_YVYU:
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_VYUY:
        case DRM_FORMAT_NV12:
        case DRM_FORMAT_XYUV8888:
        case DRM_FORMAT_P010:
        case DRM_FORMAT_P012:
        case DRM_FORMAT_P016:
        case DRM_FORMAT_Y210:
        case DRM_FORMAT_Y212:
        case DRM_FORMAT_Y216:
        case DRM_FORMAT_XVYU2101010:
        case DRM_FORMAT_XVYU12_16161616:
        case DRM_FORMAT_XVYU16161616:
                break;
        case DRM_FORMAT_XBGR16161616F:
        case DRM_FORMAT_ABGR16161616F:
        case DRM_FORMAT_XRGB16161616F:
        case DRM_FORMAT_ARGB16161616F:
                if (INTEL_GEN(dev_priv) >= 11)
                        break;
                /* fall through */
        default:
                drm_dbg_kms(&dev_priv->drm,
                            "[PLANE:%d:%s] FB:%d unsupported scaling format 0x%x\n",
                            intel_plane->base.base.id, intel_plane->base.name,
                            fb->base.id, fb->format->format);
                return -EINVAL;
        }

        return 0;
}

void skl_scaler_disable(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        int i;

        for (i = 0; i < crtc->num_scalers; i++)
                skl_detach_scaler(crtc, i);
}

static void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct intel_crtc_scaler_state *scaler_state =
                &crtc_state->scaler_state;
        struct drm_rect src = {
                .x2 = crtc_state->pipe_src_w << 16,
                .y2 = crtc_state->pipe_src_h << 16,
        };
        const struct drm_rect *dst = &crtc_state->pch_pfit.dst;
        u16 uv_rgb_hphase, uv_rgb_vphase;
        enum pipe pipe = crtc->pipe;
        int width = drm_rect_width(dst);
        int height = drm_rect_height(dst);
        int x = dst->x1;
        int y = dst->y1;
        int hscale, vscale;
        unsigned long irqflags;
        int id;

        if (!crtc_state->pch_pfit.enabled)
                return;

        if (drm_WARN_ON(&dev_priv->drm,
                        crtc_state->scaler_state.scaler_id < 0))
                return;

        hscale = drm_rect_calc_hscale(&src, dst, 0, INT_MAX);
        vscale = drm_rect_calc_vscale(&src, dst, 0, INT_MAX);

        uv_rgb_hphase = skl_scaler_calc_phase(1, hscale, false);
        uv_rgb_vphase = skl_scaler_calc_phase(1, vscale, false);

        id = scaler_state->scaler_id;

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        intel_de_write_fw(dev_priv, SKL_PS_CTRL(pipe, id), PS_SCALER_EN |
                          PS_FILTER_MEDIUM | scaler_state->scalers[id].mode);
        intel_de_write_fw(dev_priv, SKL_PS_VPHASE(pipe, id),
                          PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_vphase));
        intel_de_write_fw(dev_priv, SKL_PS_HPHASE(pipe, id),
                          PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_hphase));
        intel_de_write_fw(dev_priv, SKL_PS_WIN_POS(pipe, id),
                          x << 16 | y);
        intel_de_write_fw(dev_priv, SKL_PS_WIN_SZ(pipe, id),
                          width << 16 | height);

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void ilk_pfit_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct drm_rect *dst = &crtc_state->pch_pfit.dst;
        enum pipe pipe = crtc->pipe;
        int width = drm_rect_width(dst);
        int height = drm_rect_height(dst);
        int x = dst->x1;
        int y = dst->y1;

        if (!crtc_state->pch_pfit.enabled)
                return;

        /* Force use of hard-coded filter coefficients
         * as some pre-programmed values are broken,
         * e.g. x201.
         */
        if (IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv))
                intel_de_write(dev_priv, PF_CTL(pipe), PF_ENABLE |
                               PF_FILTER_MED_3x3 | PF_PIPE_SEL_IVB(pipe));
        else
                intel_de_write(dev_priv, PF_CTL(pipe), PF_ENABLE |
                               PF_FILTER_MED_3x3);
        intel_de_write(dev_priv, PF_WIN_POS(pipe), x << 16 | y);
        intel_de_write(dev_priv, PF_WIN_SZ(pipe), width << 16 | height);
}

void hsw_enable_ips(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc_state->ips_enabled)
                return;

        /*
         * We can only enable IPS after we enable a plane and wait for a vblank
         * This function is called from post_plane_update, which is run after
         * a vblank wait.
         */
        drm_WARN_ON(dev, !(crtc_state->active_planes & ~BIT(PLANE_CURSOR)));

        if (IS_BROADWELL(dev_priv)) {
                drm_WARN_ON(dev, sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL,
                                                         IPS_ENABLE | IPS_PCODE_CONTROL));
                /* Quoting Art Runyan: "its not safe to expect any particular
                 * value in IPS_CTL bit 31 after enabling IPS through the
                 * mailbox." Moreover, the mailbox may return a bogus state,
                 * so we need to just enable it and continue on.
                 */
        } else {
                intel_de_write(dev_priv, IPS_CTL, IPS_ENABLE);
                /* The bit only becomes 1 in the next vblank, so this wait here
                 * is essentially intel_wait_for_vblank. If we don't have this
                 * and don't wait for vblanks until the end of crtc_enable, then
                 * the HW state readout code will complain that the expected
                 * IPS_CTL value is not the one we read. */
                if (intel_de_wait_for_set(dev_priv, IPS_CTL, IPS_ENABLE, 50))
                        drm_err(&dev_priv->drm,
                                "Timed out waiting for IPS enable\n");
        }
}

void hsw_disable_ips(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc_state->ips_enabled)
                return;

        if (IS_BROADWELL(dev_priv)) {
                drm_WARN_ON(dev,
                            sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
                /*
                 * Wait for PCODE to finish disabling IPS. The BSpec specified
                 * 42ms timeout value leads to occasional timeouts so use 100ms
                 * instead.
                 */
                if (intel_de_wait_for_clear(dev_priv, IPS_CTL, IPS_ENABLE, 100))
                        drm_err(&dev_priv->drm,
                                "Timed out waiting for IPS disable\n");
        } else {
                intel_de_write(dev_priv, IPS_CTL, 0);
                intel_de_posting_read(dev_priv, IPS_CTL);
        }

        /* We need to wait for a vblank before we can disable the plane. */
        intel_wait_for_vblank(dev_priv, crtc->pipe);
}

static void intel_crtc_dpms_overlay_disable(struct intel_crtc *intel_crtc)
{
        if (intel_crtc->overlay)
                (void) intel_overlay_switch_off(intel_crtc->overlay);

        /* Let userspace switch the overlay on again. In most cases userspace
         * has to recompute where to put it anyway.
         */
}

static bool hsw_pre_update_disable_ips(const struct intel_crtc_state *old_crtc_state,
                                       const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!old_crtc_state->ips_enabled)
                return false;

        if (needs_modeset(new_crtc_state))
                return true;

        /*
         * Workaround : Do not read or write the pipe palette/gamma data while
         * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
         *
         * Disable IPS before we program the LUT.
         */
        if (IS_HASWELL(dev_priv) &&
            (new_crtc_state->uapi.color_mgmt_changed ||
             new_crtc_state->update_pipe) &&
            new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
                return true;

        return !new_crtc_state->ips_enabled;
}

static bool hsw_post_update_enable_ips(const struct intel_crtc_state *old_crtc_state,
                                       const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!new_crtc_state->ips_enabled)
                return false;

        if (needs_modeset(new_crtc_state))
                return true;

        /*
         * Workaround : Do not read or write the pipe palette/gamma data while
         * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
         *
         * Re-enable IPS after the LUT has been programmed.
         */
        if (IS_HASWELL(dev_priv) &&
            (new_crtc_state->uapi.color_mgmt_changed ||
             new_crtc_state->update_pipe) &&
            new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
                return true;

        /*
         * We can't read out IPS on broadwell, assume the worst and
         * forcibly enable IPS on the first fastset.
         */
        if (new_crtc_state->update_pipe && old_crtc_state->inherited)
                return true;

        return !old_crtc_state->ips_enabled;
}

static bool needs_nv12_wa(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        if (!crtc_state->nv12_planes)
                return false;

        /* WA Display #0827: Gen9:all */
        if (IS_GEN(dev_priv, 9) && !IS_GEMINILAKE(dev_priv))
                return true;

        return false;
}

static bool needs_scalerclk_wa(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        /* Wa_2006604312:icl,ehl */
        if (crtc_state->scaler_state.scaler_users > 0 && IS_GEN(dev_priv, 11))
                return true;

        return false;
}

static bool planes_enabling(const struct intel_crtc_state *old_crtc_state,
                            const struct intel_crtc_state *new_crtc_state)
{
        return (!old_crtc_state->active_planes || needs_modeset(new_crtc_state)) &&
                new_crtc_state->active_planes;
}

static bool planes_disabling(const struct intel_crtc_state *old_crtc_state,
                             const struct intel_crtc_state *new_crtc_state)
{
        return old_crtc_state->active_planes &&
                (!new_crtc_state->active_planes || needs_modeset(new_crtc_state));
}

static void intel_post_plane_update(struct intel_atomic_state *state,
                                    struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        enum pipe pipe = crtc->pipe;

        intel_frontbuffer_flip(dev_priv, new_crtc_state->fb_bits);

        if (new_crtc_state->update_wm_post && new_crtc_state->hw.active)
                intel_update_watermarks(crtc);

        if (hsw_post_update_enable_ips(old_crtc_state, new_crtc_state))
                hsw_enable_ips(new_crtc_state);

        intel_fbc_post_update(state, crtc);

        if (needs_nv12_wa(old_crtc_state) &&
            !needs_nv12_wa(new_crtc_state))
                skl_wa_827(dev_priv, pipe, false);

        if (needs_scalerclk_wa(old_crtc_state) &&
            !needs_scalerclk_wa(new_crtc_state))
                icl_wa_scalerclkgating(dev_priv, pipe, false);
}

static void intel_pre_plane_update(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        enum pipe pipe = crtc->pipe;

        if (hsw_pre_update_disable_ips(old_crtc_state, new_crtc_state))
                hsw_disable_ips(old_crtc_state);

        if (intel_fbc_pre_update(state, crtc))
                intel_wait_for_vblank(dev_priv, pipe);

        /* Display WA 827 */
        if (!needs_nv12_wa(old_crtc_state) &&
            needs_nv12_wa(new_crtc_state))
                skl_wa_827(dev_priv, pipe, true);

        /* Wa_2006604312:icl,ehl */
        if (!needs_scalerclk_wa(old_crtc_state) &&
            needs_scalerclk_wa(new_crtc_state))
                icl_wa_scalerclkgating(dev_priv, pipe, true);

        /*
         * Vblank time updates from the shadow to live plane control register
         * are blocked if the memory self-refresh mode is active at that
         * moment. So to make sure the plane gets truly disabled, disable
         * first the self-refresh mode. The self-refresh enable bit in turn
         * will be checked/applied by the HW only at the next frame start
         * event which is after the vblank start event, so we need to have a
         * wait-for-vblank between disabling the plane and the pipe.
         */
        if (HAS_GMCH(dev_priv) && old_crtc_state->hw.active &&
            new_crtc_state->disable_cxsr && intel_set_memory_cxsr(dev_priv, false))
                intel_wait_for_vblank(dev_priv, pipe);

        /*
         * IVB workaround: must disable low power watermarks for at least
         * one frame before enabling scaling.  LP watermarks can be re-enabled
         * when scaling is disabled.
         *
         * WaCxSRDisabledForSpriteScaling:ivb
         */
        if (old_crtc_state->hw.active &&
            new_crtc_state->disable_lp_wm && ilk_disable_lp_wm(dev_priv))
                intel_wait_for_vblank(dev_priv, pipe);

        /*
         * If we're doing a modeset we don't need to do any
         * pre-vblank watermark programming here.
         */
        if (!needs_modeset(new_crtc_state)) {
                /*
                 * For platforms that support atomic watermarks, program the
                 * 'intermediate' watermarks immediately.  On pre-gen9 platforms, these
                 * will be the intermediate values that are safe for both pre- and
                 * post- vblank; when vblank happens, the 'active' values will be set
                 * to the final 'target' values and we'll do this again to get the
                 * optimal watermarks.  For gen9+ platforms, the values we program here
                 * will be the final target values which will get automatically latched
                 * at vblank time; no further programming will be necessary.
                 *
                 * If a platform hasn't been transitioned to atomic watermarks yet,
                 * we'll continue to update watermarks the old way, if flags tell
                 * us to.
                 */
                if (dev_priv->display.initial_watermarks)
                        dev_priv->display.initial_watermarks(state, crtc);
                else if (new_crtc_state->update_wm_pre)
                        intel_update_watermarks(crtc);
        }

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So disable underrun reporting before all the planes get disabled.
         *
         * We do this after .initial_watermarks() so that we have a
         * chance of catching underruns with the intermediate watermarks
         * vs. the old plane configuration.
         */
        if (IS_GEN(dev_priv, 2) && planes_disabling(old_crtc_state, new_crtc_state))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
}

static void intel_crtc_disable_planes(struct intel_atomic_state *state,
                                      struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        unsigned int update_mask = new_crtc_state->update_planes;
        const struct intel_plane_state *old_plane_state;
        struct intel_plane *plane;
        unsigned fb_bits = 0;
        int i;

        intel_crtc_dpms_overlay_disable(crtc);

        for_each_old_intel_plane_in_state(state, plane, old_plane_state, i) {
                if (crtc->pipe != plane->pipe ||
                    !(update_mask & BIT(plane->id)))
                        continue;

                intel_disable_plane(plane, new_crtc_state);

                if (old_plane_state->uapi.visible)
                        fb_bits |= plane->frontbuffer_bit;
        }

        intel_frontbuffer_flip(dev_priv, fb_bits);
}

/*
 * intel_connector_primary_encoder - get the primary encoder for a connector
 * @connector: connector for which to return the encoder
 *
 * Returns the primary encoder for a connector. There is a 1:1 mapping from
 * all connectors to their encoder, except for DP-MST connectors which have
 * both a virtual and a primary encoder. These DP-MST primary encoders can be
 * pointed to by as many DP-MST connectors as there are pipes.
 */
static struct intel_encoder *
intel_connector_primary_encoder(struct intel_connector *connector)
{
        struct intel_encoder *encoder;

        if (connector->mst_port)
                return &dp_to_dig_port(connector->mst_port)->base;

        encoder = intel_attached_encoder(connector);
        drm_WARN_ON(connector->base.dev, !encoder);

        return encoder;
}

static void intel_encoders_update_prepare(struct intel_atomic_state *state)
{
        struct drm_connector_state *new_conn_state;
        struct drm_connector *connector;
        int i;

        for_each_new_connector_in_state(&state->base, connector, new_conn_state,
                                        i) {
                struct intel_connector *intel_connector;
                struct intel_encoder *encoder;
                struct intel_crtc *crtc;

                if (!intel_connector_needs_modeset(state, connector))
                        continue;

                intel_connector = to_intel_connector(connector);
                encoder = intel_connector_primary_encoder(intel_connector);
                if (!encoder->update_prepare)
                        continue;

                crtc = new_conn_state->crtc ?
                        to_intel_crtc(new_conn_state->crtc) : NULL;
                encoder->update_prepare(state, encoder, crtc);
        }
}

static void intel_encoders_update_complete(struct intel_atomic_state *state)
{
        struct drm_connector_state *new_conn_state;
        struct drm_connector *connector;
        int i;

        for_each_new_connector_in_state(&state->base, connector, new_conn_state,
                                        i) {
                struct intel_connector *intel_connector;
                struct intel_encoder *encoder;
                struct intel_crtc *crtc;

                if (!intel_connector_needs_modeset(state, connector))
                        continue;

                intel_connector = to_intel_connector(connector);
                encoder = intel_connector_primary_encoder(intel_connector);
                if (!encoder->update_complete)
                        continue;

                crtc = new_conn_state->crtc ?
                        to_intel_crtc(new_conn_state->crtc) : NULL;
                encoder->update_complete(state, encoder, crtc);
        }
}

static void intel_encoders_pre_pll_enable(struct intel_atomic_state *state,
                                          struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->pre_pll_enable)
                        encoder->pre_pll_enable(state, encoder,
                                                crtc_state, conn_state);
        }
}

static void intel_encoders_pre_enable(struct intel_atomic_state *state,
                                      struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->pre_enable)
                        encoder->pre_enable(state, encoder,
                                            crtc_state, conn_state);
        }
}

static void intel_encoders_enable(struct intel_atomic_state *state,
                                  struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->enable)
                        encoder->enable(state, encoder,
                                        crtc_state, conn_state);
                intel_opregion_notify_encoder(encoder, true);
        }
}

static void intel_encoders_disable(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                intel_opregion_notify_encoder(encoder, false);
                if (encoder->disable)
                        encoder->disable(state, encoder,
                                         old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_post_disable(struct intel_atomic_state *state,
                                        struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->post_disable)
                        encoder->post_disable(state, encoder,
                                              old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_post_pll_disable(struct intel_atomic_state *state,
                                            struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->post_pll_disable)
                        encoder->post_pll_disable(state, encoder,
                                                  old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_update_pipe(struct intel_atomic_state *state,
                                       struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->update_pipe)
                        encoder->update_pipe(state, encoder,
                                             crtc_state, conn_state);
        }
}

static void intel_disable_primary_plane(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);

        plane->disable_plane(plane, crtc_state);
}

static void ilk_crtc_enable(struct intel_atomic_state *state,
                            struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        /*
         * Sometimes spurious CPU pipe underruns happen during FDI
         * training, at least with VGA+HDMI cloning. Suppress them.
         *
         * On ILK we get an occasional spurious CPU pipe underruns
         * between eDP port A enable and vdd enable. Also PCH port
         * enable seems to result in the occasional CPU pipe underrun.
         *
         * Spurious PCH underruns also occur during PCH enabling.
         */
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);

        if (new_crtc_state->has_pch_encoder)
                intel_prepare_shared_dpll(new_crtc_state);

        if (intel_crtc_has_dp_encoder(new_crtc_state))
                intel_dp_set_m_n(new_crtc_state, M1_N1);

        intel_set_pipe_timings(new_crtc_state);
        intel_set_pipe_src_size(new_crtc_state);

        if (new_crtc_state->has_pch_encoder)
                intel_cpu_transcoder_set_m_n(new_crtc_state,
                                             &new_crtc_state->fdi_m_n, NULL);

        ilk_set_pipeconf(new_crtc_state);

        crtc->active = true;

        intel_encoders_pre_enable(state, crtc);

        if (new_crtc_state->has_pch_encoder) {
                /* Note: FDI PLL enabling _must_ be done before we enable the
                 * cpu pipes, hence this is separate from all the other fdi/pch
                 * enabling. */
                ilk_fdi_pll_enable(new_crtc_state);
        } else {
                assert_fdi_tx_disabled(dev_priv, pipe);
                assert_fdi_rx_disabled(dev_priv, pipe);
        }

        ilk_pfit_enable(new_crtc_state);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma for pipe bottom color */
        intel_disable_primary_plane(new_crtc_state);

        if (dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);
        intel_enable_pipe(new_crtc_state);

        if (new_crtc_state->has_pch_encoder)
                ilk_pch_enable(state, new_crtc_state);

        intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);

        if (HAS_PCH_CPT(dev_priv))
                cpt_verify_modeset(dev_priv, pipe);

        /*
         * Must wait for vblank to avoid spurious PCH FIFO underruns.
         * And a second vblank wait is needed at least on ILK with
         * some interlaced HDMI modes. Let's do the double wait always
         * in case there are more corner cases we don't know about.
         */
        if (new_crtc_state->has_pch_encoder) {
                intel_wait_for_vblank(dev_priv, pipe);
                intel_wait_for_vblank(dev_priv, pipe);
        }
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
}

/* IPS only exists on ULT machines and is tied to pipe A. */
static bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
{
        return HAS_IPS(to_i915(crtc->base.dev)) && crtc->pipe == PIPE_A;
}

static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
                                            enum pipe pipe, bool apply)
{
        u32 val = intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe));
        u32 mask = DPF_GATING_DIS | DPF_RAM_GATING_DIS | DPFR_GATING_DIS;

        if (apply)
                val |= mask;
        else
                val &= ~mask;

        intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe), val);
}

static void icl_pipe_mbus_enable(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        u32 val;

        val = MBUS_DBOX_A_CREDIT(2);

        if (INTEL_GEN(dev_priv) >= 12) {
                val |= MBUS_DBOX_BW_CREDIT(2);
                val |= MBUS_DBOX_B_CREDIT(12);
        } else {
                val |= MBUS_DBOX_BW_CREDIT(1);
                val |= MBUS_DBOX_B_CREDIT(8);
        }

        intel_de_write(dev_priv, PIPE_MBUS_DBOX_CTL(pipe), val);
}

static void hsw_set_linetime_wm(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        intel_de_write(dev_priv, WM_LINETIME(crtc->pipe),
                       HSW_LINETIME(crtc_state->linetime) |
                       HSW_IPS_LINETIME(crtc_state->ips_linetime));
}

static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        i915_reg_t reg = CHICKEN_TRANS(crtc_state->cpu_transcoder);
        u32 val;

        val = intel_de_read(dev_priv, reg);
        val &= ~HSW_FRAME_START_DELAY_MASK;
        val |= HSW_FRAME_START_DELAY(0);
        intel_de_write(dev_priv, reg, val);
}

static void hsw_crtc_enable(struct intel_atomic_state *state,
                            struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe, hsw_workaround_pipe;
        enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
        bool psl_clkgate_wa;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        intel_encoders_pre_pll_enable(state, crtc);

        if (new_crtc_state->shared_dpll)
                intel_enable_shared_dpll(new_crtc_state);

        intel_encoders_pre_enable(state, crtc);

        if (!transcoder_is_dsi(cpu_transcoder))
                intel_set_pipe_timings(new_crtc_state);

        intel_set_pipe_src_size(new_crtc_state);

        if (cpu_transcoder != TRANSCODER_EDP &&
            !transcoder_is_dsi(cpu_transcoder))
                intel_de_write(dev_priv, PIPE_MULT(cpu_transcoder),
                               new_crtc_state->pixel_multiplier - 1);

        if (new_crtc_state->has_pch_encoder)
                intel_cpu_transcoder_set_m_n(new_crtc_state,
                                             &new_crtc_state->fdi_m_n, NULL);

        if (!transcoder_is_dsi(cpu_transcoder)) {
                hsw_set_frame_start_delay(new_crtc_state);
                hsw_set_pipeconf(new_crtc_state);
        }

        if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
                bdw_set_pipemisc(new_crtc_state);

        crtc->active = true;

        /* Display WA #1180: WaDisableScalarClockGating: glk, cnl */
        psl_clkgate_wa = (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) &&
                new_crtc_state->pch_pfit.enabled;
        if (psl_clkgate_wa)
                glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, true);

        if (INTEL_GEN(dev_priv) >= 9)
                skl_pfit_enable(new_crtc_state);
        else
                ilk_pfit_enable(new_crtc_state);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma/csc for pipe bottom color */
        if (INTEL_GEN(dev_priv) < 9)
                intel_disable_primary_plane(new_crtc_state);

        hsw_set_linetime_wm(new_crtc_state);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_set_pipe_chicken(crtc);

        if (dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_pipe_mbus_enable(crtc);

        intel_encoders_enable(state, crtc);

        if (psl_clkgate_wa) {
                intel_wait_for_vblank(dev_priv, pipe);
                glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, false);
        }

        /* If we change the relative order between pipe/planes enabling, we need
         * to change the workaround. */
        hsw_workaround_pipe = new_crtc_state->hsw_workaround_pipe;
        if (IS_HASWELL(dev_priv) && hsw_workaround_pipe != INVALID_PIPE) {
                intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
                intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
        }
}

void ilk_pfit_disable(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* To avoid upsetting the power well on haswell only disable the pfit if
         * it's in use. The hw state code will make sure we get this right. */
        if (!old_crtc_state->pch_pfit.enabled)
                return;

        intel_de_write(dev_priv, PF_CTL(pipe), 0);
        intel_de_write(dev_priv, PF_WIN_POS(pipe), 0);
        intel_de_write(dev_priv, PF_WIN_SZ(pipe), 0);
}

static void ilk_crtc_disable(struct intel_atomic_state *state,
                             struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /*
         * Sometimes spurious CPU pipe underruns happen when the
         * pipe is already disabled, but FDI RX/TX is still enabled.
         * Happens at least with VGA+HDMI cloning. Suppress them.
         */
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);

        intel_encoders_disable(state, crtc);

        intel_crtc_vblank_off(old_crtc_state);

        intel_disable_pipe(old_crtc_state);

        ilk_pfit_disable(old_crtc_state);

        if (old_crtc_state->has_pch_encoder)
                ilk_fdi_disable(crtc);

        intel_encoders_post_disable(state, crtc);

        if (old_crtc_state->has_pch_encoder) {
                ilk_disable_pch_transcoder(dev_priv, pipe);

                if (HAS_PCH_CPT(dev_priv)) {
                        i915_reg_t reg;
                        u32 temp;

                        /* disable TRANS_DP_CTL */
                        reg = TRANS_DP_CTL(pipe);
                        temp = intel_de_read(dev_priv, reg);
                        temp &= ~(TRANS_DP_OUTPUT_ENABLE |
                                  TRANS_DP_PORT_SEL_MASK);
                        temp |= TRANS_DP_PORT_SEL_NONE;
                        intel_de_write(dev_priv, reg, temp);

                        /* disable DPLL_SEL */
                        temp = intel_de_read(dev_priv, PCH_DPLL_SEL);
                        temp &= ~(TRANS_DPLL_ENABLE(pipe) | TRANS_DPLLB_SEL(pipe));
                        intel_de_write(dev_priv, PCH_DPLL_SEL, temp);
                }

                ilk_fdi_pll_disable(crtc);
        }

        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
}

static void hsw_crtc_disable(struct intel_atomic_state *state,
                             struct intel_crtc *crtc)
{
        /*
         * FIXME collapse everything to one hook.
         * Need care with mst->ddi interactions.
         */
        intel_encoders_disable(state, crtc);
        intel_encoders_post_disable(state, crtc);
}

static void i9xx_pfit_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!crtc_state->gmch_pfit.control)
                return;

        /*
         * The panel fitter should only be adjusted whilst the pipe is disabled,
         * according to register description and PRM.
         */
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, PFIT_CONTROL) & PFIT_ENABLE);
        assert_pipe_disabled(dev_priv, crtc_state->cpu_transcoder);

        intel_de_write(dev_priv, PFIT_PGM_RATIOS,
                       crtc_state->gmch_pfit.pgm_ratios);
        intel_de_write(dev_priv, PFIT_CONTROL, crtc_state->gmch_pfit.control);

        /* Border color in case we don't scale up to the full screen. Black by
         * default, change to something else for debugging. */
        intel_de_write(dev_priv, BCLRPAT(crtc->pipe), 0);
}

bool intel_phy_is_combo(struct drm_i915_private *dev_priv, enum phy phy)
{
        if (phy == PHY_NONE)
                return false;
        else if (IS_ROCKETLAKE(dev_priv))
                return phy <= PHY_D;
        else if (IS_ELKHARTLAKE(dev_priv))
                return phy <= PHY_C;
        else if (INTEL_GEN(dev_priv) >= 11)
                return phy <= PHY_B;
        else
                return false;
}

bool intel_phy_is_tc(struct drm_i915_private *dev_priv, enum phy phy)
{
        if (IS_ROCKETLAKE(dev_priv))
                return false;
        else if (INTEL_GEN(dev_priv) >= 12)
                return phy >= PHY_D && phy <= PHY_I;
        else if (INTEL_GEN(dev_priv) >= 11 && !IS_ELKHARTLAKE(dev_priv))
                return phy >= PHY_C && phy <= PHY_F;
        else
                return false;
}

enum phy intel_port_to_phy(struct drm_i915_private *i915, enum port port)
{
        if (IS_ROCKETLAKE(i915) && port >= PORT_D)
                return (enum phy)port - 1;
        else if (IS_ELKHARTLAKE(i915) && port == PORT_D)
                return PHY_A;

        return (enum phy)port;
}

enum tc_port intel_port_to_tc(struct drm_i915_private *dev_priv, enum port port)
{
        if (!intel_phy_is_tc(dev_priv, intel_port_to_phy(dev_priv, port)))
                return PORT_TC_NONE;

        if (INTEL_GEN(dev_priv) >= 12)
                return port - PORT_D;

        return port - PORT_C;
}

enum intel_display_power_domain intel_port_to_power_domain(enum port port)
{
        switch (port) {
        case PORT_A:
                return POWER_DOMAIN_PORT_DDI_A_LANES;
        case PORT_B:
                return POWER_DOMAIN_PORT_DDI_B_LANES;
        case PORT_C:
                return POWER_DOMAIN_PORT_DDI_C_LANES;
        case PORT_D:
                return POWER_DOMAIN_PORT_DDI_D_LANES;
        case PORT_E:
                return POWER_DOMAIN_PORT_DDI_E_LANES;
        case PORT_F:
                return POWER_DOMAIN_PORT_DDI_F_LANES;
        case PORT_G:
                return POWER_DOMAIN_PORT_DDI_G_LANES;
        default:
                MISSING_CASE(port);
                return POWER_DOMAIN_PORT_OTHER;
        }
}

enum intel_display_power_domain
intel_aux_power_domain(struct intel_digital_port *dig_port)
{
        struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
        enum phy phy = intel_port_to_phy(dev_priv, dig_port->base.port);

        if (intel_phy_is_tc(dev_priv, phy) &&
            dig_port->tc_mode == TC_PORT_TBT_ALT) {
                switch (dig_port->aux_ch) {
                case AUX_CH_C:
                        return POWER_DOMAIN_AUX_C_TBT;
                case AUX_CH_D:
                        return POWER_DOMAIN_AUX_D_TBT;
                case AUX_CH_E:
                        return POWER_DOMAIN_AUX_E_TBT;
                case AUX_CH_F:
                        return POWER_DOMAIN_AUX_F_TBT;
                case AUX_CH_G:
                        return POWER_DOMAIN_AUX_G_TBT;
                default:
                        MISSING_CASE(dig_port->aux_ch);
                        return POWER_DOMAIN_AUX_C_TBT;
                }
        }

        return intel_legacy_aux_to_power_domain(dig_port->aux_ch);
}

/*
 * Converts aux_ch to power_domain without caring about TBT ports for that use
 * intel_aux_power_domain()
 */
enum intel_display_power_domain
intel_legacy_aux_to_power_domain(enum aux_ch aux_ch)
{
        switch (aux_ch) {
        case AUX_CH_A:
                return POWER_DOMAIN_AUX_A;
        case AUX_CH_B:
                return POWER_DOMAIN_AUX_B;
        case AUX_CH_C:
                return POWER_DOMAIN_AUX_C;
        case AUX_CH_D:
                return POWER_DOMAIN_AUX_D;
        case AUX_CH_E:
                return POWER_DOMAIN_AUX_E;
        case AUX_CH_F:
                return POWER_DOMAIN_AUX_F;
        case AUX_CH_G:
                return POWER_DOMAIN_AUX_G;
        default:
                MISSING_CASE(aux_ch);
                return POWER_DOMAIN_AUX_A;
        }
}

static u64 get_crtc_power_domains(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_encoder *encoder;
        enum pipe pipe = crtc->pipe;
        u64 mask;
        enum transcoder transcoder = crtc_state->cpu_transcoder;

        if (!crtc_state->hw.active)
                return 0;

        mask = BIT_ULL(POWER_DOMAIN_PIPE(pipe));
        mask |= BIT_ULL(POWER_DOMAIN_TRANSCODER(transcoder));
        if (crtc_state->pch_pfit.enabled ||
            crtc_state->pch_pfit.force_thru)
                mask |= BIT_ULL(POWER_DOMAIN_PIPE_PANEL_FITTER(pipe));

        drm_for_each_encoder_mask(encoder, &dev_priv->drm,
                                  crtc_state->uapi.encoder_mask) {
                struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

                mask |= BIT_ULL(intel_encoder->power_domain);
        }

        if (HAS_DDI(dev_priv) && crtc_state->has_audio)
                mask |= BIT_ULL(POWER_DOMAIN_AUDIO);

        if (crtc_state->shared_dpll)
                mask |= BIT_ULL(POWER_DOMAIN_DISPLAY_CORE);

        return mask;
}

static u64
modeset_get_crtc_power_domains(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum intel_display_power_domain domain;
        u64 domains, new_domains, old_domains;

        old_domains = crtc->enabled_power_domains;
        crtc->enabled_power_domains = new_domains =
                get_crtc_power_domains(crtc_state);

        domains = new_domains & ~old_domains;

        for_each_power_domain(domain, domains)
                intel_display_power_get(dev_priv, domain);

        return old_domains & ~new_domains;
}

static void modeset_put_power_domains(struct drm_i915_private *dev_priv,
                                      u64 domains)
{
        enum intel_display_power_domain domain;

        for_each_power_domain(domain, domains)
                intel_display_power_put_unchecked(dev_priv, domain);
}

static void valleyview_crtc_enable(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        if (intel_crtc_has_dp_encoder(new_crtc_state))
                intel_dp_set_m_n(new_crtc_state, M1_N1);

        intel_set_pipe_timings(new_crtc_state);
        intel_set_pipe_src_size(new_crtc_state);

        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
                intel_de_write(dev_priv, CHV_BLEND(pipe), CHV_BLEND_LEGACY);
                intel_de_write(dev_priv, CHV_CANVAS(pipe), 0);
        }

        i9xx_set_pipeconf(new_crtc_state);

        crtc->active = true;

        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        intel_encoders_pre_pll_enable(state, crtc);

        if (IS_CHERRYVIEW(dev_priv)) {
                chv_prepare_pll(crtc, new_crtc_state);
                chv_enable_pll(crtc, new_crtc_state);
        } else {
                vlv_prepare_pll(crtc, new_crtc_state);
                vlv_enable_pll(crtc, new_crtc_state);
        }

        intel_encoders_pre_enable(state, crtc);

        i9xx_pfit_enable(new_crtc_state);

        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma for pipe bottom color */
        intel_disable_primary_plane(new_crtc_state);

        dev_priv->display.initial_watermarks(state, crtc);
        intel_enable_pipe(new_crtc_state);

        intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);
}

static void i9xx_set_pll_dividers(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        intel_de_write(dev_priv, FP0(crtc->pipe),
                       crtc_state->dpll_hw_state.fp0);
        intel_de_write(dev_priv, FP1(crtc->pipe),
                       crtc_state->dpll_hw_state.fp1);
}

static void i9xx_crtc_enable(struct intel_atomic_state *state,
                             struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        i9xx_set_pll_dividers(new_crtc_state);

        if (intel_crtc_has_dp_encoder(new_crtc_state))
                intel_dp_set_m_n(new_crtc_state, M1_N1);

        intel_set_pipe_timings(new_crtc_state);
        intel_set_pipe_src_size(new_crtc_state);

        i9xx_set_pipeconf(new_crtc_state);

        crtc->active = true;

        if (!IS_GEN(dev_priv, 2))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        intel_encoders_pre_enable(state, crtc);

        i9xx_enable_pll(crtc, new_crtc_state);

        i9xx_pfit_enable(new_crtc_state);

        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma for pipe bottom color */
        intel_disable_primary_plane(new_crtc_state);

        if (dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);
        else
                intel_update_watermarks(crtc);
        intel_enable_pipe(new_crtc_state);

        intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);

        /* prevents spurious underruns */
        if (IS_GEN(dev_priv, 2))
                intel_wait_for_vblank(dev_priv, pipe);
}

static void i9xx_pfit_disable(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!old_crtc_state->gmch_pfit.control)
                return;

        assert_pipe_disabled(dev_priv, old_crtc_state->cpu_transcoder);

        drm_dbg_kms(&dev_priv->drm, "disabling pfit, current: 0x%08x\n",
                    intel_de_read(dev_priv, PFIT_CONTROL));
        intel_de_write(dev_priv, PFIT_CONTROL, 0);
}

static void i9xx_crtc_disable(struct intel_atomic_state *state,
                              struct intel_crtc *crtc)
{
        struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /*
         * On gen2 planes are double buffered but the pipe isn't, so we must
         * wait for planes to fully turn off before disabling the pipe.
         */
        if (IS_GEN(dev_priv, 2))
                intel_wait_for_vblank(dev_priv, pipe);

        intel_encoders_disable(state, crtc);

        intel_crtc_vblank_off(old_crtc_state);

        intel_disable_pipe(old_crtc_state);

        i9xx_pfit_disable(old_crtc_state);

        intel_encoders_post_disable(state, crtc);

        if (!intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DSI)) {
                if (IS_CHERRYVIEW(dev_priv))
                        chv_disable_pll(dev_priv, pipe);
                else if (IS_VALLEYVIEW(dev_priv))
                        vlv_disable_pll(dev_priv, pipe);
                else
                        i9xx_disable_pll(old_crtc_state);
        }

        intel_encoders_post_pll_disable(state, crtc);

        if (!IS_GEN(dev_priv, 2))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);

        if (!dev_priv->display.initial_watermarks)
                intel_update_watermarks(crtc);

        /* clock the pipe down to 640x480@60 to potentially save power */
        if (IS_I830(dev_priv))
                i830_enable_pipe(dev_priv, pipe);
}

static void intel_crtc_disable_noatomic(struct intel_crtc *crtc,
                                        struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *encoder;
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_bw_state *bw_state =
                to_intel_bw_state(dev_priv->bw_obj.state);
        struct intel_cdclk_state *cdclk_state =
                to_intel_cdclk_state(dev_priv->cdclk.obj.state);
        struct intel_dbuf_state *dbuf_state =
                to_intel_dbuf_state(dev_priv->dbuf.obj.state);
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        enum intel_display_power_domain domain;
        struct intel_plane *plane;
        struct drm_atomic_state *state;
        struct intel_crtc_state *temp_crtc_state;
        enum pipe pipe = crtc->pipe;
        u64 domains;
        int ret;

        if (!crtc_state->hw.active)
                return;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                const struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);

                if (plane_state->uapi.visible)
                        intel_plane_disable_noatomic(crtc, plane);
        }

        state = drm_atomic_state_alloc(&dev_priv->drm);
        if (!state) {
                drm_dbg_kms(&dev_priv->drm,
                            "failed to disable [CRTC:%d:%s], out of memory",
                            crtc->base.base.id, crtc->base.name);
                return;
        }

        state->acquire_ctx = ctx;

        /* Everything's already locked, -EDEADLK can't happen. */
        temp_crtc_state = intel_atomic_get_crtc_state(state, crtc);
        ret = drm_atomic_add_affected_connectors(state, &crtc->base);

        drm_WARN_ON(&dev_priv->drm, IS_ERR(temp_crtc_state) || ret);

        dev_priv->display.crtc_disable(to_intel_atomic_state(state), crtc);

        drm_atomic_state_put(state);

        drm_dbg_kms(&dev_priv->drm,
                    "[CRTC:%d:%s] hw state adjusted, was enabled, now disabled\n",
                    crtc->base.base.id, crtc->base.name);

        crtc->active = false;
        crtc->base.enabled = false;

        drm_WARN_ON(&dev_priv->drm,
                    drm_atomic_set_mode_for_crtc(&crtc_state->uapi, NULL) < 0);
        crtc_state->uapi.active = false;
        crtc_state->uapi.connector_mask = 0;
        crtc_state->uapi.encoder_mask = 0;
        intel_crtc_free_hw_state(crtc_state);
        memset(&crtc_state->hw, 0, sizeof(crtc_state->hw));

        for_each_encoder_on_crtc(&dev_priv->drm, &crtc->base, encoder)
                encoder->base.crtc = NULL;

        intel_fbc_disable(crtc);
        intel_update_watermarks(crtc);
        intel_disable_shared_dpll(crtc_state);

        domains = crtc->enabled_power_domains;
        for_each_power_domain(domain, domains)
                intel_display_power_put_unchecked(dev_priv, domain);
        crtc->enabled_power_domains = 0;

        dev_priv->active_pipes &= ~BIT(pipe);
        cdclk_state->min_cdclk[pipe] = 0;
        cdclk_state->min_voltage_level[pipe] = 0;
        cdclk_state->active_pipes &= ~BIT(pipe);

        dbuf_state->active_pipes &= ~BIT(pipe);

        bw_state->data_rate[pipe] = 0;
        bw_state->num_active_planes[pipe] = 0;
}

/*
 * turn all crtc's off, but do not adjust state
 * This has to be paired with a call to intel_modeset_setup_hw_state.
 */
int intel_display_suspend(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state;
        int ret;

        state = drm_atomic_helper_suspend(dev);
        ret = PTR_ERR_OR_ZERO(state);
        if (ret)
                drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
                        ret);
        else
                dev_priv->modeset_restore_state = state;
        return ret;
}

void intel_encoder_destroy(struct drm_encoder *encoder)
{
        struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

        drm_encoder_cleanup(encoder);
        kfree(intel_encoder);
}

/* Cross check the actual hw state with our own modeset state tracking (and it's
 * internal consistency). */
static void intel_connector_verify_state(struct intel_crtc_state *crtc_state,
                                         struct drm_connector_state *conn_state)
{
        struct intel_connector *connector = to_intel_connector(conn_state->connector);
        struct drm_i915_private *i915 = to_i915(connector->base.dev);

        drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s]\n",
                    connector->base.base.id, connector->base.name);

        if (connector->get_hw_state(connector)) {
                struct intel_encoder *encoder = intel_attached_encoder(connector);

                I915_STATE_WARN(!crtc_state,
                         "connector enabled without attached crtc\n");

                if (!crtc_state)
                        return;

                I915_STATE_WARN(!crtc_state->hw.active,
                                "connector is active, but attached crtc isn't\n");

                if (!encoder || encoder->type == INTEL_OUTPUT_DP_MST)
                        return;

                I915_STATE_WARN(conn_state->best_encoder != &encoder->base,
                        "atomic encoder doesn't match attached encoder\n");

                I915_STATE_WARN(conn_state->crtc != encoder->base.crtc,
                        "attached encoder crtc differs from connector crtc\n");
        } else {
                I915_STATE_WARN(crtc_state && crtc_state->hw.active,
                                "attached crtc is active, but connector isn't\n");
                I915_STATE_WARN(!crtc_state && conn_state->best_encoder,
                        "best encoder set without crtc!\n");
        }
}

static int pipe_required_fdi_lanes(struct intel_crtc_state *crtc_state)
{
        if (crtc_state->hw.enable && crtc_state->has_pch_encoder)
                return crtc_state->fdi_lanes;

        return 0;
}

static int ilk_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state = pipe_config->uapi.state;
        struct intel_crtc *other_crtc;
        struct intel_crtc_state *other_crtc_state;

        drm_dbg_kms(&dev_priv->drm,
                    "checking fdi config on pipe %c, lanes %i\n",
                    pipe_name(pipe), pipe_config->fdi_lanes);
        if (pipe_config->fdi_lanes > 4) {
                drm_dbg_kms(&dev_priv->drm,
                            "invalid fdi lane config on pipe %c: %i lanes\n",
                            pipe_name(pipe), pipe_config->fdi_lanes);
                return -EINVAL;
        }

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                if (pipe_config->fdi_lanes > 2) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "only 2 lanes on haswell, required: %i lanes\n",
                                    pipe_config->fdi_lanes);
                        return -EINVAL;
                } else {
                        return 0;
                }
        }

        if (INTEL_NUM_PIPES(dev_priv) == 2)
                return 0;

        /* Ivybridge 3 pipe is really complicated */
        switch (pipe) {
        case PIPE_A:
                return 0;
        case PIPE_B:
                if (pipe_config->fdi_lanes <= 2)
                        return 0;

                other_crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_C);
                other_crtc_state =
                        intel_atomic_get_crtc_state(state, other_crtc);
                if (IS_ERR(other_crtc_state))
                        return PTR_ERR(other_crtc_state);

                if (pipe_required_fdi_lanes(other_crtc_state) > 0) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "invalid shared fdi lane config on pipe %c: %i lanes\n",
                                    pipe_name(pipe), pipe_config->fdi_lanes);
                        return -EINVAL;
                }
                return 0;
        case PIPE_C:
                if (pipe_config->fdi_lanes > 2) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "only 2 lanes on pipe %c: required %i lanes\n",
                                    pipe_name(pipe), pipe_config->fdi_lanes);
                        return -EINVAL;
                }

                other_crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_B);
                other_crtc_state =
                        intel_atomic_get_crtc_state(state, other_crtc);
                if (IS_ERR(other_crtc_state))
                        return PTR_ERR(other_crtc_state);

                if (pipe_required_fdi_lanes(other_crtc_state) > 2) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "fdi link B uses too many lanes to enable link C\n");
                        return -EINVAL;
                }
                return 0;
        default:
                BUG();
        }
}

#define RETRY 1
static int ilk_fdi_compute_config(struct intel_crtc *intel_crtc,
                                  struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *i915 = to_i915(dev);
        const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
        int lane, link_bw, fdi_dotclock, ret;
        bool needs_recompute = false;

retry:
        /* FDI is a binary signal running at ~2.7GHz, encoding
         * each output octet as 10 bits. The actual frequency
         * is stored as a divider into a 100MHz clock, and the
         * mode pixel clock is stored in units of 1KHz.
         * Hence the bw of each lane in terms of the mode signal
         * is:
         */
        link_bw = intel_fdi_link_freq(i915, pipe_config);

        fdi_dotclock = adjusted_mode->crtc_clock;

        lane = ilk_get_lanes_required(fdi_dotclock, link_bw,
                                      pipe_config->pipe_bpp);

        pipe_config->fdi_lanes = lane;

        intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
                               link_bw, &pipe_config->fdi_m_n, false, false);

        ret = ilk_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
        if (ret == -EDEADLK)
                return ret;

        if (ret == -EINVAL && pipe_config->pipe_bpp > 6*3) {
                pipe_config->pipe_bpp -= 2*3;
                drm_dbg_kms(&i915->drm,
                            "fdi link bw constraint, reducing pipe bpp to %i\n",
                            pipe_config->pipe_bpp);
                needs_recompute = true;
                pipe_config->bw_constrained = true;

                goto retry;
        }

        if (needs_recompute)
                return RETRY;

        return ret;
}

bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* IPS only exists on ULT machines and is tied to pipe A. */
        if (!hsw_crtc_supports_ips(crtc))
                return false;

        if (!dev_priv->params.enable_ips)
                return false;

        if (crtc_state->pipe_bpp > 24)
                return false;

        /*
         * We compare against max which means we must take
         * the increased cdclk requirement into account when
         * calculating the new cdclk.
         *
         * Should measure whether using a lower cdclk w/o IPS
         */
        if (IS_BROADWELL(dev_priv) &&
            crtc_state->pixel_rate > dev_priv->max_cdclk_freq * 95 / 100)
                return false;

        return true;
}

static int hsw_compute_ips_config(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(crtc_state->uapi.crtc->dev);
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->uapi.state);

        crtc_state->ips_enabled = false;

        if (!hsw_crtc_state_ips_capable(crtc_state))
                return 0;

        /*
         * When IPS gets enabled, the pipe CRC changes. Since IPS gets
         * enabled and disabled dynamically based on package C states,
         * user space can't make reliable use of the CRCs, so let's just
         * completely disable it.
         */
        if (crtc_state->crc_enabled)
                return 0;

        /* IPS should be fine as long as at least one plane is enabled. */
        if (!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)))
                return 0;

        if (IS_BROADWELL(dev_priv)) {
                const struct intel_cdclk_state *cdclk_state;

                cdclk_state = intel_atomic_get_cdclk_state(state);
                if (IS_ERR(cdclk_state))
                        return PTR_ERR(cdclk_state);

                /* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
                if (crtc_state->pixel_rate > cdclk_state->logical.cdclk * 95 / 100)
                        return 0;
        }

        crtc_state->ips_enabled = true;

        return 0;
}

static bool intel_crtc_supports_double_wide(const struct intel_crtc *crtc)
{
        const struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* GDG double wide on either pipe, otherwise pipe A only */
        return INTEL_GEN(dev_priv) < 4 &&
                (crtc->pipe == PIPE_A || IS_I915G(dev_priv));
}

static u32 ilk_pipe_pixel_rate(const struct intel_crtc_state *crtc_state)
{
        u32 pixel_rate = crtc_state->hw.adjusted_mode.crtc_clock;
        unsigned int pipe_w, pipe_h, pfit_w, pfit_h;

        /*
         * We only use IF-ID interlacing. If we ever use
         * PF-ID we'll need to adjust the pixel_rate here.
         */

        if (!crtc_state->pch_pfit.enabled)
                return pixel_rate;

        pipe_w = crtc_state->pipe_src_w;
        pipe_h = crtc_state->pipe_src_h;

        pfit_w = drm_rect_width(&crtc_state->pch_pfit.dst);
        pfit_h = drm_rect_height(&crtc_state->pch_pfit.dst);

        if (pipe_w < pfit_w)
                pipe_w = pfit_w;
        if (pipe_h < pfit_h)
                pipe_h = pfit_h;

        if (drm_WARN_ON(crtc_state->uapi.crtc->dev,
                        !pfit_w || !pfit_h))
                return pixel_rate;

        return div_u64(mul_u32_u32(pixel_rate, pipe_w * pipe_h),
                       pfit_w * pfit_h);
}

static void intel_crtc_compute_pixel_rate(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        if (HAS_GMCH(dev_priv))
                /* FIXME calculate proper pipe pixel rate for GMCH pfit */
                crtc_state->pixel_rate =
                        crtc_state->hw.adjusted_mode.crtc_clock;
        else
                crtc_state->pixel_rate =
                        ilk_pipe_pixel_rate(crtc_state);
}

static int intel_crtc_compute_config(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
        int clock_limit = dev_priv->max_dotclk_freq;

        if (INTEL_GEN(dev_priv) < 4) {
                clock_limit = dev_priv->max_cdclk_freq * 9 / 10;

                /*
                 * Enable double wide mode when the dot clock
                 * is > 90% of the (display) core speed.
                 */
                if (intel_crtc_supports_double_wide(crtc) &&
                    adjusted_mode->crtc_clock > clock_limit) {
                        clock_limit = dev_priv->max_dotclk_freq;
                        pipe_config->double_wide = true;
                }
        }

        if (adjusted_mode->crtc_clock > clock_limit) {
                drm_dbg_kms(&dev_priv->drm,
                            "requested pixel clock (%d kHz) too high (max: %d kHz, double wide: %s)\n",
                            adjusted_mode->crtc_clock, clock_limit,
                            yesno(pipe_config->double_wide));
                return -EINVAL;
        }

        if ((pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
             pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR444) &&
             pipe_config->hw.ctm) {
                /*
                 * There is only one pipe CSC unit per pipe, and we need that
                 * for output conversion from RGB->YCBCR. So if CTM is already
                 * applied we can't support YCBCR420 output.
                 */
                drm_dbg_kms(&dev_priv->drm,
                            "YCBCR420 and CTM together are not possible\n");
                return -EINVAL;
        }

        /*
         * Pipe horizontal size must be even in:
         * - DVO ganged mode
         * - LVDS dual channel mode
         * - Double wide pipe
         */
        if (pipe_config->pipe_src_w & 1) {
                if (pipe_config->double_wide) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Odd pipe source width not supported with double wide pipe\n");
                        return -EINVAL;
                }

                if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_LVDS) &&
                    intel_is_dual_link_lvds(dev_priv)) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Odd pipe source width not supported with dual link LVDS\n");
                        return -EINVAL;
                }
        }

        /* Cantiga+ cannot handle modes with a hsync front porch of 0.
         * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
         */
        if ((INTEL_GEN(dev_priv) > 4 || IS_G4X(dev_priv)) &&
                adjusted_mode->crtc_hsync_start == adjusted_mode->crtc_hdisplay)
                return -EINVAL;

        intel_crtc_compute_pixel_rate(pipe_config);

        if (pipe_config->has_pch_encoder)
                return ilk_fdi_compute_config(crtc, pipe_config);

        return 0;
}

static void
intel_reduce_m_n_ratio(u32 *num, u32 *den)
{
        while (*num > DATA_LINK_M_N_MASK ||
               *den > DATA_LINK_M_N_MASK) {
                *num >>= 1;
                *den >>= 1;
        }
}

static void compute_m_n(unsigned int m, unsigned int n,
                        u32 *ret_m, u32 *ret_n,
                        bool constant_n)
{
        /*
         * Several DP dongles in particular seem to be fussy about
         * too large link M/N values. Give N value as 0x8000 that
         * should be acceptable by specific devices. 0x8000 is the
         * specified fixed N value for asynchronous clock mode,
         * which the devices expect also in synchronous clock mode.
         */
        if (constant_n)
                *ret_n = 0x8000;
        else
                *ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);

        *ret_m = div_u64(mul_u32_u32(m, *ret_n), n);
        intel_reduce_m_n_ratio(ret_m, ret_n);
}

void
intel_link_compute_m_n(u16 bits_per_pixel, int nlanes,
                       int pixel_clock, int link_clock,
                       struct intel_link_m_n *m_n,
                       bool constant_n, bool fec_enable)
{
        u32 data_clock = bits_per_pixel * pixel_clock;

        if (fec_enable)
                data_clock = intel_dp_mode_to_fec_clock(data_clock);

        m_n->tu = 64;
        compute_m_n(data_clock,
                    link_clock * nlanes * 8,
                    &m_n->gmch_m, &m_n->gmch_n,
                    constant_n);

        compute_m_n(pixel_clock, link_clock,
                    &m_n->link_m, &m_n->link_n,
                    constant_n);
}

static void intel_panel_sanitize_ssc(struct drm_i915_private *dev_priv)
{
        /*
         * There may be no VBT; and if the BIOS enabled SSC we can
         * just keep using it to avoid unnecessary flicker.  Whereas if the
         * BIOS isn't using it, don't assume it will work even if the VBT
         * indicates as much.
         */
        if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv)) {
                bool bios_lvds_use_ssc = intel_de_read(dev_priv,
                                                       PCH_DREF_CONTROL) &
                        DREF_SSC1_ENABLE;

                if (dev_priv->vbt.lvds_use_ssc != bios_lvds_use_ssc) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "SSC %s by BIOS, overriding VBT which says %s\n",
                                    enableddisabled(bios_lvds_use_ssc),
                                    enableddisabled(dev_priv->vbt.lvds_use_ssc));
                        dev_priv->vbt.lvds_use_ssc = bios_lvds_use_ssc;
                }
        }
}

static bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
{
        if (dev_priv->params.panel_use_ssc >= 0)
                return dev_priv->params.panel_use_ssc != 0;
        return dev_priv->vbt.lvds_use_ssc
                && !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
}

static u32 pnv_dpll_compute_fp(struct dpll *dpll)
{
        return (1 << dpll->n) << 16 | dpll->m2;
}

static u32 i9xx_dpll_compute_fp(struct dpll *dpll)
{
        return dpll->n << 16 | dpll->m1 << 8 | dpll->m2;
}

static void i9xx_update_pll_dividers(struct intel_crtc *crtc,
                                     struct intel_crtc_state *crtc_state,
                                     struct dpll *reduced_clock)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 fp, fp2 = 0;

        if (IS_PINEVIEW(dev_priv)) {
                fp = pnv_dpll_compute_fp(&crtc_state->dpll);
                if (reduced_clock)
                        fp2 = pnv_dpll_compute_fp(reduced_clock);
        } else {
                fp = i9xx_dpll_compute_fp(&crtc_state->dpll);
                if (reduced_clock)
                        fp2 = i9xx_dpll_compute_fp(reduced_clock);
        }

        crtc_state->dpll_hw_state.fp0 = fp;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
            reduced_clock) {
                crtc_state->dpll_hw_state.fp1 = fp2;
        } else {
                crtc_state->dpll_hw_state.fp1 = fp;
        }
}

static void vlv_pllb_recal_opamp(struct drm_i915_private *dev_priv, enum pipe
                pipe)
{
        u32 reg_val;

        /*
         * PLLB opamp always calibrates to max value of 0x3f, force enable it
         * and set it to a reasonable value instead.
         */
        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
        reg_val &= 0xffffff00;
        reg_val |= 0x00000030;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
        reg_val &= 0x00ffffff;
        reg_val |= 0x8c000000;
        vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
        reg_val &= 0xffffff00;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
        reg_val &= 0x00ffffff;
        reg_val |= 0xb0000000;
        vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);
}

static void intel_pch_transcoder_set_m_n(const struct intel_crtc_state *crtc_state,
                                         const struct intel_link_m_n *m_n)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        intel_de_write(dev_priv, PCH_TRANS_DATA_M1(pipe),
                       TU_SIZE(m_n->tu) | m_n->gmch_m);
        intel_de_write(dev_priv, PCH_TRANS_DATA_N1(pipe), m_n->gmch_n);
        intel_de_write(dev_priv, PCH_TRANS_LINK_M1(pipe), m_n->link_m);
        intel_de_write(dev_priv, PCH_TRANS_LINK_N1(pipe), m_n->link_n);
}

static bool transcoder_has_m2_n2(struct drm_i915_private *dev_priv,
                                 enum transcoder transcoder)
{
        if (IS_HASWELL(dev_priv))
                return transcoder == TRANSCODER_EDP;

        /*
         * Strictly speaking some registers are available before
         * gen7, but we only support DRRS on gen7+
         */
        return IS_GEN(dev_priv, 7) || IS_CHERRYVIEW(dev_priv);
}

static void intel_cpu_transcoder_set_m_n(const struct intel_crtc_state *crtc_state,
                                         const struct intel_link_m_n *m_n,
                                         const struct intel_link_m_n *m2_n2)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        enum transcoder transcoder = crtc_state->cpu_transcoder;

        if (INTEL_GEN(dev_priv) >= 5) {
                intel_de_write(dev_priv, PIPE_DATA_M1(transcoder),
                               TU_SIZE(m_n->tu) | m_n->gmch_m);
                intel_de_write(dev_priv, PIPE_DATA_N1(transcoder),
                               m_n->gmch_n);
                intel_de_write(dev_priv, PIPE_LINK_M1(transcoder),
                               m_n->link_m);
                intel_de_write(dev_priv, PIPE_LINK_N1(transcoder),
                               m_n->link_n);
                /*
                 *  M2_N2 registers are set only if DRRS is supported
                 * (to make sure the registers are not unnecessarily accessed).
                 */
                if (m2_n2 && crtc_state->has_drrs &&
                    transcoder_has_m2_n2(dev_priv, transcoder)) {
                        intel_de_write(dev_priv, PIPE_DATA_M2(transcoder),
                                       TU_SIZE(m2_n2->tu) | m2_n2->gmch_m);
                        intel_de_write(dev_priv, PIPE_DATA_N2(transcoder),
                                       m2_n2->gmch_n);
                        intel_de_write(dev_priv, PIPE_LINK_M2(transcoder),
                                       m2_n2->link_m);
                        intel_de_write(dev_priv, PIPE_LINK_N2(transcoder),
                                       m2_n2->link_n);
                }
        } else {
                intel_de_write(dev_priv, PIPE_DATA_M_G4X(pipe),
                               TU_SIZE(m_n->tu) | m_n->gmch_m);
                intel_de_write(dev_priv, PIPE_DATA_N_G4X(pipe), m_n->gmch_n);
                intel_de_write(dev_priv, PIPE_LINK_M_G4X(pipe), m_n->link_m);
                intel_de_write(dev_priv, PIPE_LINK_N_G4X(pipe), m_n->link_n);
        }
}

void intel_dp_set_m_n(const struct intel_crtc_state *crtc_state, enum link_m_n_set m_n)
{
        const struct intel_link_m_n *dp_m_n, *dp_m2_n2 = NULL;
        struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);

        if (m_n == M1_N1) {
                dp_m_n = &crtc_state->dp_m_n;
                dp_m2_n2 = &crtc_state->dp_m2_n2;
        } else if (m_n == M2_N2) {

                /*
                 * M2_N2 registers are not supported. Hence m2_n2 divider value
                 * needs to be programmed into M1_N1.
                 */
                dp_m_n = &crtc_state->dp_m2_n2;
        } else {
                drm_err(&i915->drm, "Unsupported divider value\n");
                return;
        }

        if (crtc_state->has_pch_encoder)
                intel_pch_transcoder_set_m_n(crtc_state, &crtc_state->dp_m_n);
        else
                intel_cpu_transcoder_set_m_n(crtc_state, dp_m_n, dp_m2_n2);
}

static void vlv_compute_dpll(struct intel_crtc *crtc,
                             struct intel_crtc_state *pipe_config)
{
        pipe_config->dpll_hw_state.dpll = DPLL_INTEGRATED_REF_CLK_VLV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (crtc->pipe != PIPE_A)
                pipe_config->dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;

        /* DPLL not used with DSI, but still need the rest set up */
        if (!intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DSI))
                pipe_config->dpll_hw_state.dpll |= DPLL_VCO_ENABLE |
                        DPLL_EXT_BUFFER_ENABLE_VLV;

        pipe_config->dpll_hw_state.dpll_md =
                (pipe_config->pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
}

static void chv_compute_dpll(struct intel_crtc *crtc,
                             struct intel_crtc_state *pipe_config)
{
        pipe_config->dpll_hw_state.dpll = DPLL_SSC_REF_CLK_CHV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (crtc->pipe != PIPE_A)
                pipe_config->dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;

        /* DPLL not used with DSI, but still need the rest set up */
        if (!intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DSI))
                pipe_config->dpll_hw_state.dpll |= DPLL_VCO_ENABLE;

        pipe_config->dpll_hw_state.dpll_md =
                (pipe_config->pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
}

static void vlv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        u32 mdiv;
        u32 bestn, bestm1, bestm2, bestp1, bestp2;
        u32 coreclk, reg_val;

        /* Enable Refclk */
        intel_de_write(dev_priv, DPLL(pipe),
                       pipe_config->dpll_hw_state.dpll & ~(DPLL_VCO_ENABLE | DPLL_EXT_BUFFER_ENABLE_VLV));

        /* No need to actually set up the DPLL with DSI */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        vlv_dpio_get(dev_priv);

        bestn = pipe_config->dpll.n;
        bestm1 = pipe_config->dpll.m1;
        bestm2 = pipe_config->dpll.m2;
        bestp1 = pipe_config->dpll.p1;
        bestp2 = pipe_config->dpll.p2;

        /* See eDP HDMI DPIO driver vbios notes doc */

        /* PLL B needs special handling */
        if (pipe == PIPE_B)
                vlv_pllb_recal_opamp(dev_priv, pipe);

        /* Set up Tx target for periodic Rcomp update */
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9_BCAST, 0x0100000f);

        /* Disable target IRef on PLL */
        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW8(pipe));
        reg_val &= 0x00ffffff;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW8(pipe), reg_val);

        /* Disable fast lock */
        vlv_dpio_write(dev_priv, pipe, VLV_CMN_DW0, 0x610);

        /* Set idtafcrecal before PLL is enabled */
        mdiv = ((bestm1 << DPIO_M1DIV_SHIFT) | (bestm2 & DPIO_M2DIV_MASK));
        mdiv |= ((bestp1 << DPIO_P1_SHIFT) | (bestp2 << DPIO_P2_SHIFT));
        mdiv |= ((bestn << DPIO_N_SHIFT));
        mdiv |= (1 << DPIO_K_SHIFT);

        /*
         * Post divider depends on pixel clock rate, DAC vs digital (and LVDS,
         * but we don't support that).
         * Note: don't use the DAC post divider as it seems unstable.
         */
        mdiv |= (DPIO_POST_DIV_HDMIDP << DPIO_POST_DIV_SHIFT);
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);

        mdiv |= DPIO_ENABLE_CALIBRATION;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);

        /* Set HBR and RBR LPF coefficients */
        if (pipe_config->port_clock == 162000 ||
            intel_crtc_has_type(pipe_config, INTEL_OUTPUT_ANALOG) ||
            intel_crtc_has_type(pipe_config, INTEL_OUTPUT_HDMI))
                vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
                                 0x009f0003);
        else
                vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
                                 0x00d0000f);

        if (intel_crtc_has_dp_encoder(pipe_config)) {
                /* Use SSC source */
                if (pipe == PIPE_A)
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df40000);
                else
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df70000);
        } else { /* HDMI or VGA */
                /* Use bend source */
                if (pipe == PIPE_A)
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df70000);
                else
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df40000);
        }

        coreclk = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW7(pipe));
        coreclk = (coreclk & 0x0000ff00) | 0x01c00000;
        if (intel_crtc_has_dp_encoder(pipe_config))
                coreclk |= 0x01000000;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW7(pipe), coreclk);

        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW11(pipe), 0x87871000);

        vlv_dpio_put(dev_priv);
}

static void chv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 loopfilter, tribuf_calcntr;
        u32 bestn, bestm1, bestm2, bestp1, bestp2, bestm2_frac;
        u32 dpio_val;
        int vco;

        /* Enable Refclk and SSC */
        intel_de_write(dev_priv, DPLL(pipe),
                       pipe_config->dpll_hw_state.dpll & ~DPLL_VCO_ENABLE);

        /* No need to actually set up the DPLL with DSI */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        bestn = pipe_config->dpll.n;
        bestm2_frac = pipe_config->dpll.m2 & 0x3fffff;
        bestm1 = pipe_config->dpll.m1;
        bestm2 = pipe_config->dpll.m2 >> 22;
        bestp1 = pipe_config->dpll.p1;
        bestp2 = pipe_config->dpll.p2;
        vco = pipe_config->dpll.vco;
        dpio_val = 0;
        loopfilter = 0;

        vlv_dpio_get(dev_priv);

        /* p1 and p2 divider */
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW13(port),
                        5 << DPIO_CHV_S1_DIV_SHIFT |
                        bestp1 << DPIO_CHV_P1_DIV_SHIFT |
                        bestp2 << DPIO_CHV_P2_DIV_SHIFT |
                        1 << DPIO_CHV_K_DIV_SHIFT);

        /* Feedback post-divider - m2 */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW0(port), bestm2);

        /* Feedback refclk divider - n and m1 */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW1(port),
                        DPIO_CHV_M1_DIV_BY_2 |
                        1 << DPIO_CHV_N_DIV_SHIFT);

        /* M2 fraction division */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);

        /* M2 fraction division enable */
        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
        dpio_val &= ~(DPIO_CHV_FEEDFWD_GAIN_MASK | DPIO_CHV_FRAC_DIV_EN);
        dpio_val |= (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT);
        if (bestm2_frac)
                dpio_val |= DPIO_CHV_FRAC_DIV_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);

        /* Program digital lock detect threshold */
        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW9(port));
        dpio_val &= ~(DPIO_CHV_INT_LOCK_THRESHOLD_MASK |
                                        DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE);
        dpio_val |= (0x5 << DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT);
        if (!bestm2_frac)
                dpio_val |= DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE;
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW9(port), dpio_val);

        /* Loop filter */
        if (vco == 5400000) {
                loopfilter |= (0x3 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0x8 << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x1 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0x9;
        } else if (vco <= 6200000) {
                loopfilter |= (0x5 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0xB << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0x9;
        } else if (vco <= 6480000) {
                loopfilter |= (0x4 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0x9 << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0x8;
        } else {
                /* Not supported. Apply the same limits as in the max case */
                loopfilter |= (0x4 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0x9 << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0;
        }
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW6(port), loopfilter);

        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW8(port));
        dpio_val &= ~DPIO_CHV_TDC_TARGET_CNT_MASK;
        dpio_val |= (tribuf_calcntr << DPIO_CHV_TDC_TARGET_CNT_SHIFT);
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW8(port), dpio_val);

        /* AFC Recal */
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port),
                        vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port)) |
                        DPIO_AFC_RECAL);

        vlv_dpio_put(dev_priv);
}

/**
 * vlv_force_pll_on - forcibly enable just the PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to enable
 * @dpll: PLL configuration
 *
 * Enable the PLL for @pipe using the supplied @dpll config. To be used
 * in cases where we need the PLL enabled even when @pipe is not going to
 * be enabled.
 */
int vlv_force_pll_on(struct drm_i915_private *dev_priv, enum pipe pipe,
                     const struct dpll *dpll)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
        struct intel_crtc_state *pipe_config;

        pipe_config = intel_crtc_state_alloc(crtc);
        if (!pipe_config)
                return -ENOMEM;

        pipe_config->cpu_transcoder = (enum transcoder)pipe;
        pipe_config->pixel_multiplier = 1;
        pipe_config->dpll = *dpll;

        if (IS_CHERRYVIEW(dev_priv)) {
                chv_compute_dpll(crtc, pipe_config);
                chv_prepare_pll(crtc, pipe_config);
                chv_enable_pll(crtc, pipe_config);
        } else {
                vlv_compute_dpll(crtc, pipe_config);
                vlv_prepare_pll(crtc, pipe_config);
                vlv_enable_pll(crtc, pipe_config);
        }

        kfree(pipe_config);

        return 0;
}

/**
 * vlv_force_pll_off - forcibly disable just the PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to disable
 *
 * Disable the PLL for @pipe. To be used in cases where we need
 * the PLL enabled even when @pipe is not going to be enabled.
 */
void vlv_force_pll_off(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        if (IS_CHERRYVIEW(dev_priv))
                chv_disable_pll(dev_priv, pipe);
        else
                vlv_disable_pll(dev_priv, pipe);
}

static void i9xx_compute_dpll(struct intel_crtc *crtc,
                              struct intel_crtc_state *crtc_state,
                              struct dpll *reduced_clock)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 dpll;
        struct dpll *clock = &crtc_state->dpll;

        i9xx_update_pll_dividers(crtc, crtc_state, reduced_clock);

        dpll = DPLL_VGA_MODE_DIS;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS))
                dpll |= DPLLB_MODE_LVDS;
        else
                dpll |= DPLLB_MODE_DAC_SERIAL;

        if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
            IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
                dpll |= (crtc_state->pixel_multiplier - 1)
                        << SDVO_MULTIPLIER_SHIFT_HIRES;
        }

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO) ||
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        if (intel_crtc_has_dp_encoder(crtc_state))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /* compute bitmask from p1 value */
        if (IS_PINEVIEW(dev_priv))
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW;
        else {
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                if (IS_G4X(dev_priv) && reduced_clock)
                        dpll |= (1 << (reduced_clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
        }
        switch (clock->p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }
        if (INTEL_GEN(dev_priv) >= 4)
                dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);

        if (crtc_state->sdvo_tv_clock)
                dpll |= PLL_REF_INPUT_TVCLKINBC;
        else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
                 intel_panel_use_ssc(dev_priv))
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;
        crtc_state->dpll_hw_state.dpll = dpll;

        if (INTEL_GEN(dev_priv) >= 4) {
                u32 dpll_md = (crtc_state->pixel_multiplier - 1)
                        << DPLL_MD_UDI_MULTIPLIER_SHIFT;
                crtc_state->dpll_hw_state.dpll_md = dpll_md;
        }
}

static void i8xx_compute_dpll(struct intel_crtc *crtc,
                              struct intel_crtc_state *crtc_state,
                              struct dpll *reduced_clock)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll;
        struct dpll *clock = &crtc_state->dpll;

        i9xx_update_pll_dividers(crtc, crtc_state, reduced_clock);

        dpll = DPLL_VGA_MODE_DIS;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
        } else {
                if (clock->p1 == 2)
                        dpll |= PLL_P1_DIVIDE_BY_TWO;
                else
                        dpll |= (clock->p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                if (clock->p2 == 4)
                        dpll |= PLL_P2_DIVIDE_BY_4;
        }

        /*
         * Bspec:
         * "[Almador Errata}: For the correct operation of the muxed DVO pins
         *  (GDEVSELB/I2Cdata, GIRDBY/I2CClk) and (GFRAMEB/DVI_Data,
         *  GTRDYB/DVI_Clk): Bit 31 (DPLL VCO Enable) and Bit 30 (2X Clock
         *  Enable) must be set to “1” in both the DPLL A Control Register
         *  (06014h-06017h) and DPLL B Control Register (06018h-0601Bh)."
         *
         * For simplicity We simply keep both bits always enabled in
         * both DPLLS. The spec says we should disable the DVO 2X clock
         * when not needed, but this seems to work fine in practice.
         */
        if (IS_I830(dev_priv) ||
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DVO))
                dpll |= DPLL_DVO_2X_MODE;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
            intel_panel_use_ssc(dev_priv))
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;
        crtc_state->dpll_hw_state.dpll = dpll;
}

static void intel_set_pipe_timings(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
        u32 crtc_vtotal, crtc_vblank_end;
        int vsyncshift = 0;

        /* We need to be careful not to changed the adjusted mode, for otherwise
         * the hw state checker will get angry at the mismatch. */
        crtc_vtotal = adjusted_mode->crtc_vtotal;
        crtc_vblank_end = adjusted_mode->crtc_vblank_end;

        if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
                /* the chip adds 2 halflines automatically */
                crtc_vtotal -= 1;
                crtc_vblank_end -= 1;

                if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                        vsyncshift = (adjusted_mode->crtc_htotal - 1) / 2;
                else
                        vsyncshift = adjusted_mode->crtc_hsync_start -
                                adjusted_mode->crtc_htotal / 2;
                if (vsyncshift < 0)
                        vsyncshift += adjusted_mode->crtc_htotal;
        }

        if (INTEL_GEN(dev_priv) > 3)
                intel_de_write(dev_priv, VSYNCSHIFT(cpu_transcoder),
                               vsyncshift);

        intel_de_write(dev_priv, HTOTAL(cpu_transcoder),
                       (adjusted_mode->crtc_hdisplay - 1) | ((adjusted_mode->crtc_htotal - 1) << 16));
        intel_de_write(dev_priv, HBLANK(cpu_transcoder),
                       (adjusted_mode->crtc_hblank_start - 1) | ((adjusted_mode->crtc_hblank_end - 1) << 16));
        intel_de_write(dev_priv, HSYNC(cpu_transcoder),
                       (adjusted_mode->crtc_hsync_start - 1) | ((adjusted_mode->crtc_hsync_end - 1) << 16));

        intel_de_write(dev_priv, VTOTAL(cpu_transcoder),
                       (adjusted_mode->crtc_vdisplay - 1) | ((crtc_vtotal - 1) << 16));
        intel_de_write(dev_priv, VBLANK(cpu_transcoder),
                       (adjusted_mode->crtc_vblank_start - 1) | ((crtc_vblank_end - 1) << 16));
        intel_de_write(dev_priv, VSYNC(cpu_transcoder),
                       (adjusted_mode->crtc_vsync_start - 1) | ((adjusted_mode->crtc_vsync_end - 1) << 16));

        /* Workaround: when the EDP input selection is B, the VTOTAL_B must be
         * programmed with the VTOTAL_EDP value. Same for VTOTAL_C. This is
         * documented on the DDI_FUNC_CTL register description, EDP Input Select
         * bits. */
        if (IS_HASWELL(dev_priv) && cpu_transcoder == TRANSCODER_EDP &&
            (pipe == PIPE_B || pipe == PIPE_C))
                intel_de_write(dev_priv, VTOTAL(pipe),
                               intel_de_read(dev_priv, VTOTAL(cpu_transcoder)));

}

static void intel_set_pipe_src_size(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* pipesrc controls the size that is scaled from, which should
         * always be the user's requested size.
         */
        intel_de_write(dev_priv, PIPESRC(pipe),
                       ((crtc_state->pipe_src_w - 1) << 16) | (crtc_state->pipe_src_h - 1));
}

static bool intel_pipe_is_interlaced(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        if (IS_GEN(dev_priv, 2))
                return false;

        if (INTEL_GEN(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                return intel_de_read(dev_priv, PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK_HSW;
        else
                return intel_de_read(dev_priv, PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK;
}

static void intel_get_pipe_timings(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
        u32 tmp;

        tmp = intel_de_read(dev_priv, HTOTAL(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_hdisplay = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_htotal = ((tmp >> 16) & 0xffff) + 1;

        if (!transcoder_is_dsi(cpu_transcoder)) {
                tmp = intel_de_read(dev_priv, HBLANK(cpu_transcoder));
                pipe_config->hw.adjusted_mode.crtc_hblank_start =
                                                        (tmp & 0xffff) + 1;
                pipe_config->hw.adjusted_mode.crtc_hblank_end =
                                                ((tmp >> 16) & 0xffff) + 1;
        }
        tmp = intel_de_read(dev_priv, HSYNC(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_hsync_start = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_hsync_end = ((tmp >> 16) & 0xffff) + 1;

        tmp = intel_de_read(dev_priv, VTOTAL(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_vdisplay = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_vtotal = ((tmp >> 16) & 0xffff) + 1;

        if (!transcoder_is_dsi(cpu_transcoder)) {
                tmp = intel_de_read(dev_priv, VBLANK(cpu_transcoder));
                pipe_config->hw.adjusted_mode.crtc_vblank_start =
                                                        (tmp & 0xffff) + 1;
                pipe_config->hw.adjusted_mode.crtc_vblank_end =
                                                ((tmp >> 16) & 0xffff) + 1;
        }
        tmp = intel_de_read(dev_priv, VSYNC(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_vsync_start = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_vsync_end = ((tmp >> 16) & 0xffff) + 1;

        if (intel_pipe_is_interlaced(pipe_config)) {
                pipe_config->hw.adjusted_mode.flags |= DRM_MODE_FLAG_INTERLACE;
                pipe_config->hw.adjusted_mode.crtc_vtotal += 1;
                pipe_config->hw.adjusted_mode.crtc_vblank_end += 1;
        }
}

static void intel_get_pipe_src_size(struct intel_crtc *crtc,
                                    struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPESRC(crtc->pipe));
        pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
        pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;

        pipe_config->hw.mode.vdisplay = pipe_config->pipe_src_h;
        pipe_config->hw.mode.hdisplay = pipe_config->pipe_src_w;
}

void intel_mode_from_pipe_config(struct drm_display_mode *mode,
                                 struct intel_crtc_state *pipe_config)
{
        mode->hdisplay = pipe_config->hw.adjusted_mode.crtc_hdisplay;
        mode->htotal = pipe_config->hw.adjusted_mode.crtc_htotal;
        mode->hsync_start = pipe_config->hw.adjusted_mode.crtc_hsync_start;
        mode->hsync_end = pipe_config->hw.adjusted_mode.crtc_hsync_end;

        mode->vdisplay = pipe_config->hw.adjusted_mode.crtc_vdisplay;
        mode->vtotal = pipe_config->hw.adjusted_mode.crtc_vtotal;
        mode->vsync_start = pipe_config->hw.adjusted_mode.crtc_vsync_start;
        mode->vsync_end = pipe_config->hw.adjusted_mode.crtc_vsync_end;

        mode->flags = pipe_config->hw.adjusted_mode.flags;
        mode->type = DRM_MODE_TYPE_DRIVER;

        mode->clock = pipe_config->hw.adjusted_mode.crtc_clock;

        drm_mode_set_name(mode);
}

static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 pipeconf;

        pipeconf = 0;

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                pipeconf |= intel_de_read(dev_priv, PIPECONF(crtc->pipe)) & PIPECONF_ENABLE;

        if (crtc_state->double_wide)
                pipeconf |= PIPECONF_DOUBLE_WIDE;

        /* only g4x and later have fancy bpc/dither controls */
        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                /* Bspec claims that we can't use dithering for 30bpp pipes. */
                if (crtc_state->dither && crtc_state->pipe_bpp != 30)
                        pipeconf |= PIPECONF_DITHER_EN |
                                    PIPECONF_DITHER_TYPE_SP;

                switch (crtc_state->pipe_bpp) {
                case 18:
                        pipeconf |= PIPECONF_6BPC;
                        break;
                case 24:
                        pipeconf |= PIPECONF_8BPC;
                        break;
                case 30:
                        pipeconf |= PIPECONF_10BPC;
                        break;
                default:
                        /* Case prevented by intel_choose_pipe_bpp_dither. */
                        BUG();
                }
        }

        if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
                if (INTEL_GEN(dev_priv) < 4 ||
                    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                        pipeconf |= PIPECONF_INTERLACE_W_FIELD_INDICATION;
                else
                        pipeconf |= PIPECONF_INTERLACE_W_SYNC_SHIFT;
        } else {
                pipeconf |= PIPECONF_PROGRESSIVE;
        }

        if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
             crtc_state->limited_color_range)
                pipeconf |= PIPECONF_COLOR_RANGE_SELECT;

        pipeconf |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);

        pipeconf |= PIPECONF_FRAME_START_DELAY(0);

        intel_de_write(dev_priv, PIPECONF(crtc->pipe), pipeconf);
        intel_de_posting_read(dev_priv, PIPECONF(crtc->pipe));
}

static int i8xx_crtc_compute_clock(struct intel_crtc *crtc,
                                   struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 48000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        drm_dbg_kms(&dev_priv->drm,
                                    "using SSC reference clock of %d kHz\n",
                                    refclk);
                }

                limit = &intel_limits_i8xx_lvds;
        } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DVO)) {
                limit = &intel_limits_i8xx_dvo;
        } else {
                limit = &intel_limits_i8xx_dac;
        }

        if (!crtc_state->clock_set &&
            !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                 refclk, NULL, &crtc_state->dpll)) {
                drm_err(&dev_priv->drm,
                        "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i8xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int g4x_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct intel_limit *limit;
        int refclk = 96000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        drm_dbg_kms(&dev_priv->drm,
                                    "using SSC reference clock of %d kHz\n",
                                    refclk);
                }

                if (intel_is_dual_link_lvds(dev_priv))
                        limit = &intel_limits_g4x_dual_channel_lvds;
                else
                        limit = &intel_limits_g4x_single_channel_lvds;
        } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) ||
                   intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG)) {
                limit = &intel_limits_g4x_hdmi;
        } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO)) {
                limit = &intel_limits_g4x_sdvo;
        } else {
                /* The option is for other outputs */
                limit = &intel_limits_i9xx_sdvo;
        }

        if (!crtc_state->clock_set &&
            !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                drm_err(&dev_priv->drm,
                        "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i9xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int pnv_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 96000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        drm_dbg_kms(&dev_priv->drm,
                                    "using SSC reference clock of %d kHz\n",
                                    refclk);
                }

                limit = &pnv_limits_lvds;
        } else {
                limit = &pnv_limits_sdvo;
        }

        if (!crtc_state->clock_set &&
            !pnv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                drm_err(&dev_priv->drm,
                        "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i9xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
                                   struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 96000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        drm_dbg_kms(&dev_priv->drm,
                                    "using SSC reference clock of %d kHz\n",
                                    refclk);
                }

                limit = &intel_limits_i9xx_lvds;
        } else {
                limit = &intel_limits_i9xx_sdvo;
        }

        if (!crtc_state->clock_set &&
            !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                 refclk, NULL, &crtc_state->dpll)) {
                drm_err(&dev_priv->drm,
                        "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i9xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int chv_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        int refclk = 100000;
        const struct intel_limit *limit = &intel_limits_chv;
        struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (!crtc_state->clock_set &&
            !chv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                drm_err(&i915->drm, "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        chv_compute_dpll(crtc, crtc_state);

        return 0;
}

static int vlv_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        int refclk = 100000;
        const struct intel_limit *limit = &intel_limits_vlv;
        struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (!crtc_state->clock_set &&
            !vlv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                drm_err(&i915->drm,  "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        vlv_compute_dpll(crtc, crtc_state);

        return 0;
}

static bool i9xx_has_pfit(struct drm_i915_private *dev_priv)
{
        if (IS_I830(dev_priv))
                return false;

        return INTEL_GEN(dev_priv) >= 4 ||
                IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv);
}

static void i9xx_get_pfit_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 tmp;

        if (!i9xx_has_pfit(dev_priv))
                return;

        tmp = intel_de_read(dev_priv, PFIT_CONTROL);
        if (!(tmp & PFIT_ENABLE))
                return;

        /* Check whether the pfit is attached to our pipe. */
        if (INTEL_GEN(dev_priv) < 4) {
                if (crtc->pipe != PIPE_B)
                        return;
        } else {
                if ((tmp & PFIT_PIPE_MASK) != (crtc->pipe << PFIT_PIPE_SHIFT))
                        return;
        }

        crtc_state->gmch_pfit.control = tmp;
        crtc_state->gmch_pfit.pgm_ratios =
                intel_de_read(dev_priv, PFIT_PGM_RATIOS);
}

static void vlv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        struct dpll clock;
        u32 mdiv;
        int refclk = 100000;

        /* In case of DSI, DPLL will not be used */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        vlv_dpio_get(dev_priv);
        mdiv = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW3(pipe));
        vlv_dpio_put(dev_priv);

        clock.m1 = (mdiv >> DPIO_M1DIV_SHIFT) & 7;
        clock.m2 = mdiv & DPIO_M2DIV_MASK;
        clock.n = (mdiv >> DPIO_N_SHIFT) & 0xf;
        clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
        clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;

        pipe_config->port_clock = vlv_calc_dpll_params(refclk, &clock);
}

static void
i9xx_get_initial_plane_config(struct intel_crtc *crtc,
                              struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        enum pipe pipe;
        u32 val, base, offset;
        int fourcc, pixel_format;
        unsigned int aligned_height;
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;

        if (!plane->get_hw_state(plane, &pipe))
                return;

        drm_WARN_ON(dev, pipe != crtc->pipe);

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                drm_dbg_kms(&dev_priv->drm, "failed to alloc fb\n");
                return;
        }

        fb = &intel_fb->base;

        fb->dev = dev;

        val = intel_de_read(dev_priv, DSPCNTR(i9xx_plane));

        if (INTEL_GEN(dev_priv) >= 4) {
                if (val & DISPPLANE_TILED) {
                        plane_config->tiling = I915_TILING_X;
                        fb->modifier = I915_FORMAT_MOD_X_TILED;
                }

                if (val & DISPPLANE_ROTATE_180)
                        plane_config->rotation = DRM_MODE_ROTATE_180;
        }

        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B &&
            val & DISPPLANE_MIRROR)
                plane_config->rotation |= DRM_MODE_REFLECT_X;

        pixel_format = val & DISPPLANE_PIXFORMAT_MASK;
        fourcc = i9xx_format_to_fourcc(pixel_format);
        fb->format = drm_format_info(fourcc);

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                offset = intel_de_read(dev_priv, DSPOFFSET(i9xx_plane));
                base = intel_de_read(dev_priv, DSPSURF(i9xx_plane)) & 0xfffff000;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                if (plane_config->tiling)
                        offset = intel_de_read(dev_priv,
                                               DSPTILEOFF(i9xx_plane));
                else
                        offset = intel_de_read(dev_priv,
                                               DSPLINOFF(i9xx_plane));
                base = intel_de_read(dev_priv, DSPSURF(i9xx_plane)) & 0xfffff000;
        } else {
                base = intel_de_read(dev_priv, DSPADDR(i9xx_plane));
        }
        plane_config->base = base;

        val = intel_de_read(dev_priv, PIPESRC(pipe));
        fb->width = ((val >> 16) & 0xfff) + 1;
        fb->height = ((val >> 0) & 0xfff) + 1;

        val = intel_de_read(dev_priv, DSPSTRIDE(i9xx_plane));
        fb->pitches[0] = val & 0xffffffc0;

        aligned_height = intel_fb_align_height(fb, 0, fb->height);

        plane_config->size = fb->pitches[0] * aligned_height;

        drm_dbg_kms(&dev_priv->drm,
                    "%s/%s with fb: size=%dx%d@%d, offset=%x, pitch %d, size 0x%x\n",
                    crtc->base.name, plane->base.name, fb->width, fb->height,
                    fb->format->cpp[0] * 8, base, fb->pitches[0],
                    plane_config->size);

        plane_config->fb = intel_fb;
}

static void chv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        struct dpll clock;
        u32 cmn_dw13, pll_dw0, pll_dw1, pll_dw2, pll_dw3;
        int refclk = 100000;

        /* In case of DSI, DPLL will not be used */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        vlv_dpio_get(dev_priv);
        cmn_dw13 = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW13(port));
        pll_dw0 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW0(port));
        pll_dw1 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW1(port));
        pll_dw2 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW2(port));
        pll_dw3 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
        vlv_dpio_put(dev_priv);

        clock.m1 = (pll_dw1 & 0x7) == DPIO_CHV_M1_DIV_BY_2 ? 2 : 0;
        clock.m2 = (pll_dw0 & 0xff) << 22;
        if (pll_dw3 & DPIO_CHV_FRAC_DIV_EN)
                clock.m2 |= pll_dw2 & 0x3fffff;
        clock.n = (pll_dw1 >> DPIO_CHV_N_DIV_SHIFT) & 0xf;
        clock.p1 = (cmn_dw13 >> DPIO_CHV_P1_DIV_SHIFT) & 0x7;
        clock.p2 = (cmn_dw13 >> DPIO_CHV_P2_DIV_SHIFT) & 0x1f;

        pipe_config->port_clock = chv_calc_dpll_params(refclk, &clock);
}

static enum intel_output_format
bdw_get_pipemisc_output_format(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPEMISC(crtc->pipe));

        if (tmp & PIPEMISC_YUV420_ENABLE) {
                /* We support 4:2:0 in full blend mode only */
                drm_WARN_ON(&dev_priv->drm,
                            (tmp & PIPEMISC_YUV420_MODE_FULL_BLEND) == 0);

                return INTEL_OUTPUT_FORMAT_YCBCR420;
        } else if (tmp & PIPEMISC_OUTPUT_COLORSPACE_YUV) {
                return INTEL_OUTPUT_FORMAT_YCBCR444;
        } else {
                return INTEL_OUTPUT_FORMAT_RGB;
        }
}

static void i9xx_get_pipe_color_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        u32 tmp;

        tmp = intel_de_read(dev_priv, DSPCNTR(i9xx_plane));

        if (tmp & DISPPLANE_GAMMA_ENABLE)
                crtc_state->gamma_enable = true;

        if (!HAS_GMCH(dev_priv) &&
            tmp & DISPPLANE_PIPE_CSC_ENABLE)
                crtc_state->csc_enable = true;
}

static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
                                 struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;
        u32 tmp;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = NULL;

        ret = false;

        tmp = intel_de_read(dev_priv, PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                goto out;

        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                switch (tmp & PIPECONF_BPC_MASK) {
                case PIPECONF_6BPC:
                        pipe_config->pipe_bpp = 18;
                        break;
                case PIPECONF_8BPC:
                        pipe_config->pipe_bpp = 24;
                        break;
                case PIPECONF_10BPC:
                        pipe_config->pipe_bpp = 30;
                        break;
                default:
                        break;
                }
        }

        if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
            (tmp & PIPECONF_COLOR_RANGE_SELECT))
                pipe_config->limited_color_range = true;

        pipe_config->gamma_mode = (tmp & PIPECONF_GAMMA_MODE_MASK_I9XX) >>
                PIPECONF_GAMMA_MODE_SHIFT;

        if (IS_CHERRYVIEW(dev_priv))
                pipe_config->cgm_mode = intel_de_read(dev_priv,
                                                      CGM_PIPE_MODE(crtc->pipe));

        i9xx_get_pipe_color_config(pipe_config);
        intel_color_get_config(pipe_config);

        if (INTEL_GEN(dev_priv) < 4)
                pipe_config->double_wide = tmp & PIPECONF_DOUBLE_WIDE;

        intel_get_pipe_timings(crtc, pipe_config);
        intel_get_pipe_src_size(crtc, pipe_config);

        i9xx_get_pfit_config(pipe_config);

        if (INTEL_GEN(dev_priv) >= 4) {
                /* No way to read it out on pipes B and C */
                if (IS_CHERRYVIEW(dev_priv) && crtc->pipe != PIPE_A)
                        tmp = dev_priv->chv_dpll_md[crtc->pipe];
                else
                        tmp = intel_de_read(dev_priv, DPLL_MD(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & DPLL_MD_UDI_MULTIPLIER_MASK)
                         >> DPLL_MD_UDI_MULTIPLIER_SHIFT) + 1;
                pipe_config->dpll_hw_state.dpll_md = tmp;
        } else if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
                   IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
                tmp = intel_de_read(dev_priv, DPLL(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & SDVO_MULTIPLIER_MASK)
                         >> SDVO_MULTIPLIER_SHIFT_HIRES) + 1;
        } else {
                /* Note that on i915G/GM the pixel multiplier is in the sdvo
                 * port and will be fixed up in the encoder->get_config
                 * function. */
                pipe_config->pixel_multiplier = 1;
        }
        pipe_config->dpll_hw_state.dpll = intel_de_read(dev_priv,
                                                        DPLL(crtc->pipe));
        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
                pipe_config->dpll_hw_state.fp0 = intel_de_read(dev_priv,
                                                               FP0(crtc->pipe));
                pipe_config->dpll_hw_state.fp1 = intel_de_read(dev_priv,
                                                               FP1(crtc->pipe));
        } else {
                /* Mask out read-only status bits. */
                pipe_config->dpll_hw_state.dpll &= ~(DPLL_LOCK_VLV |
                                                     DPLL_PORTC_READY_MASK |
                                                     DPLL_PORTB_READY_MASK);
        }

        if (IS_CHERRYVIEW(dev_priv))
                chv_crtc_clock_get(crtc, pipe_config);
        else if (IS_VALLEYVIEW(dev_priv))
                vlv_crtc_clock_get(crtc, pipe_config);
        else
                i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * Normally the dotclock is filled in by the encoder .get_config()
         * but in case the pipe is enabled w/o any ports we need a sane
         * default.
         */
        pipe_config->hw.adjusted_mode.crtc_clock =
                pipe_config->port_clock / pipe_config->pixel_multiplier;

        ret = true;

out:
        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

static void ilk_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        int i;
        u32 val, final;
        bool has_lvds = false;
        bool has_cpu_edp = false;
        bool has_panel = false;
        bool has_ck505 = false;
        bool can_ssc = false;
        bool using_ssc_source = false;

        /* We need to take the global config into account */
        for_each_intel_encoder(&dev_priv->drm, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        has_panel = true;
                        has_lvds = true;
                        break;
                case INTEL_OUTPUT_EDP:
                        has_panel = true;
                        if (encoder->port == PORT_A)
                                has_cpu_edp = true;
                        break;
                default:
                        break;
                }
        }

        if (HAS_PCH_IBX(dev_priv)) {
                has_ck505 = dev_priv->vbt.display_clock_mode;
                can_ssc = has_ck505;
        } else {
                has_ck505 = false;
                can_ssc = true;
        }

        /* Check if any DPLLs are using the SSC source */
        for (i = 0; i < dev_priv->dpll.num_shared_dpll; i++) {
                u32 temp = intel_de_read(dev_priv, PCH_DPLL(i));

                if (!(temp & DPLL_VCO_ENABLE))
                        continue;

                if ((temp & PLL_REF_INPUT_MASK) ==
                    PLLB_REF_INPUT_SPREADSPECTRUMIN) {
                        using_ssc_source = true;
                        break;
                }
        }

        drm_dbg_kms(&dev_priv->drm,
                    "has_panel %d has_lvds %d has_ck505 %d using_ssc_source %d\n",
                    has_panel, has_lvds, has_ck505, using_ssc_source);

        /* Ironlake: try to setup display ref clock before DPLL
         * enabling. This is only under driver's control after
         * PCH B stepping, previous chipset stepping should be
         * ignoring this setting.
         */
        val = intel_de_read(dev_priv, PCH_DREF_CONTROL);

        /* As we must carefully and slowly disable/enable each source in turn,
         * compute the final state we want first and check if we need to
         * make any changes at all.
         */
        final = val;
        final &= ~DREF_NONSPREAD_SOURCE_MASK;
        if (has_ck505)
                final |= DREF_NONSPREAD_CK505_ENABLE;
        else
                final |= DREF_NONSPREAD_SOURCE_ENABLE;

        final &= ~DREF_SSC_SOURCE_MASK;
        final &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
        final &= ~DREF_SSC1_ENABLE;

        if (has_panel) {
                final |= DREF_SSC_SOURCE_ENABLE;

                if (intel_panel_use_ssc(dev_priv) && can_ssc)
                        final |= DREF_SSC1_ENABLE;

                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc)
                                final |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        else
                                final |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        final |= DREF_CPU_SOURCE_OUTPUT_DISABLE;
        } else if (using_ssc_source) {
                final |= DREF_SSC_SOURCE_ENABLE;
                final |= DREF_SSC1_ENABLE;
        }

        if (final == val)
                return;

        /* Always enable nonspread source */
        val &= ~DREF_NONSPREAD_SOURCE_MASK;

        if (has_ck505)
                val |= DREF_NONSPREAD_CK505_ENABLE;
        else
                val |= DREF_NONSPREAD_SOURCE_ENABLE;

        if (has_panel) {
                val &= ~DREF_SSC_SOURCE_MASK;
                val |= DREF_SSC_SOURCE_ENABLE;

                /* SSC must be turned on before enabling the CPU output  */
                if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                        drm_dbg_kms(&dev_priv->drm, "Using SSC on panel\n");
                        val |= DREF_SSC1_ENABLE;
                } else
                        val &= ~DREF_SSC1_ENABLE;

                /* Get SSC going before enabling the outputs */
                intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                udelay(200);

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Enable CPU source on CPU attached eDP */
                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "Using SSC on eDP\n");
                                val |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        } else
                                val |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                udelay(200);
        } else {
                drm_dbg_kms(&dev_priv->drm, "Disabling CPU source output\n");

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Turn off CPU output */
                val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                udelay(200);

                if (!using_ssc_source) {
                        drm_dbg_kms(&dev_priv->drm, "Disabling SSC source\n");

                        /* Turn off the SSC source */
                        val &= ~DREF_SSC_SOURCE_MASK;
                        val |= DREF_SSC_SOURCE_DISABLE;

                        /* Turn off SSC1 */
                        val &= ~DREF_SSC1_ENABLE;

                        intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                        intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                        udelay(200);
                }
        }

        BUG_ON(val != final);
}

static void lpt_reset_fdi_mphy(struct drm_i915_private *dev_priv)
{
        u32 tmp;

        tmp = intel_de_read(dev_priv, SOUTH_CHICKEN2);
        tmp |= FDI_MPHY_IOSFSB_RESET_CTL;
        intel_de_write(dev_priv, SOUTH_CHICKEN2, tmp);

        if (wait_for_us(intel_de_read(dev_priv, SOUTH_CHICKEN2) &
                        FDI_MPHY_IOSFSB_RESET_STATUS, 100))
                drm_err(&dev_priv->drm, "FDI mPHY reset assert timeout\n");

        tmp = intel_de_read(dev_priv, SOUTH_CHICKEN2);
        tmp &= ~FDI_MPHY_IOSFSB_RESET_CTL;
        intel_de_write(dev_priv, SOUTH_CHICKEN2, tmp);

        if (wait_for_us((intel_de_read(dev_priv, SOUTH_CHICKEN2) &
                         FDI_MPHY_IOSFSB_RESET_STATUS) == 0, 100))
                drm_err(&dev_priv->drm, "FDI mPHY reset de-assert timeout\n");
}

/* WaMPhyProgramming:hsw */
static void lpt_program_fdi_mphy(struct drm_i915_private *dev_priv)
{
        u32 tmp;

        tmp = intel_sbi_read(dev_priv, 0x8008, SBI_MPHY);
        tmp &= ~(0xFF << 24);
        tmp |= (0x12 << 24);
        intel_sbi_write(dev_priv, 0x8008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2008, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2108, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2108, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x206C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x206C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x216C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x216C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2080, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2080, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2180, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2180, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x208C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x208C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x218C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x218C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2098, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2098, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2198, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2198, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x20C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x21C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x20EC, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
}

/* Implements 3 different sequences from BSpec chapter "Display iCLK
 * Programming" based on the parameters passed:
 * - Sequence to enable CLKOUT_DP
 * - Sequence to enable CLKOUT_DP without spread
 * - Sequence to enable CLKOUT_DP for FDI usage and configure PCH FDI I/O
 */
static void lpt_enable_clkout_dp(struct drm_i915_private *dev_priv,
                                 bool with_spread, bool with_fdi)
{
        u32 reg, tmp;

        if (drm_WARN(&dev_priv->drm, with_fdi && !with_spread,
                     "FDI requires downspread\n"))
                with_spread = true;
        if (drm_WARN(&dev_priv->drm, HAS_PCH_LPT_LP(dev_priv) &&
                     with_fdi, "LP PCH doesn't have FDI\n"))
                with_fdi = false;

        mutex_lock(&dev_priv->sb_lock);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        tmp &= ~SBI_SSCCTL_DISABLE;
        tmp |= SBI_SSCCTL_PATHALT;
        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

        udelay(24);

        if (with_spread) {
                tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
                tmp &= ~SBI_SSCCTL_PATHALT;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

                if (with_fdi) {
                        lpt_reset_fdi_mphy(dev_priv);
                        lpt_program_fdi_mphy(dev_priv);
                }
        }

        reg = HAS_PCH_LPT_LP(dev_priv) ? SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp |= SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

/* Sequence to disable CLKOUT_DP */
void lpt_disable_clkout_dp(struct drm_i915_private *dev_priv)
{
        u32 reg, tmp;

        mutex_lock(&dev_priv->sb_lock);

        reg = HAS_PCH_LPT_LP(dev_priv) ? SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp &= ~SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        if (!(tmp & SBI_SSCCTL_DISABLE)) {
                if (!(tmp & SBI_SSCCTL_PATHALT)) {
                        tmp |= SBI_SSCCTL_PATHALT;
                        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
                        udelay(32);
                }
                tmp |= SBI_SSCCTL_DISABLE;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
        }

        mutex_unlock(&dev_priv->sb_lock);
}

#define BEND_IDX(steps) ((50 + (steps)) / 5)

static const u16 sscdivintphase[] = {
        [BEND_IDX( 50)] = 0x3B23,
        [BEND_IDX( 45)] = 0x3B23,
        [BEND_IDX( 40)] = 0x3C23,
        [BEND_IDX( 35)] = 0x3C23,
        [BEND_IDX( 30)] = 0x3D23,
        [BEND_IDX( 25)] = 0x3D23,
        [BEND_IDX( 20)] = 0x3E23,
        [BEND_IDX( 15)] = 0x3E23,
        [BEND_IDX( 10)] = 0x3F23,
        [BEND_IDX(  5)] = 0x3F23,
        [BEND_IDX(  0)] = 0x0025,
        [BEND_IDX( -5)] = 0x0025,
        [BEND_IDX(-10)] = 0x0125,
        [BEND_IDX(-15)] = 0x0125,
        [BEND_IDX(-20)] = 0x0225,
        [BEND_IDX(-25)] = 0x0225,
        [BEND_IDX(-30)] = 0x0325,
        [BEND_IDX(-35)] = 0x0325,
        [BEND_IDX(-40)] = 0x0425,
        [BEND_IDX(-45)] = 0x0425,
        [BEND_IDX(-50)] = 0x0525,
};

/*
 * Bend CLKOUT_DP
 * steps -50 to 50 inclusive, in steps of 5
 * < 0 slow down the clock, > 0 speed up the clock, 0 == no bend (135MHz)
 * change in clock period = -(steps / 10) * 5.787 ps
 */
static void lpt_bend_clkout_dp(struct drm_i915_private *dev_priv, int steps)
{
        u32 tmp;
        int idx = BEND_IDX(steps);

        if (drm_WARN_ON(&dev_priv->drm, steps % 5 != 0))
                return;

        if (drm_WARN_ON(&dev_priv->drm, idx >= ARRAY_SIZE(sscdivintphase)))
                return;

        mutex_lock(&dev_priv->sb_lock);

        if (steps % 10 != 0)
                tmp = 0xAAAAAAAB;
        else
                tmp = 0x00000000;
        intel_sbi_write(dev_priv, SBI_SSCDITHPHASE, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE, SBI_ICLK);
        tmp &= 0xffff0000;
        tmp |= sscdivintphase[idx];
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

#undef BEND_IDX

static bool spll_uses_pch_ssc(struct drm_i915_private *dev_priv)
{
        u32 fuse_strap = intel_de_read(dev_priv, FUSE_STRAP);
        u32 ctl = intel_de_read(dev_priv, SPLL_CTL);

        if ((ctl & SPLL_PLL_ENABLE) == 0)
                return false;

        if ((ctl & SPLL_REF_MASK) == SPLL_REF_MUXED_SSC &&
            (fuse_strap & HSW_CPU_SSC_ENABLE) == 0)
                return true;

        if (IS_BROADWELL(dev_priv) &&
            (ctl & SPLL_REF_MASK) == SPLL_REF_PCH_SSC_BDW)
                return true;

        return false;
}

static bool wrpll_uses_pch_ssc(struct drm_i915_private *dev_priv,
                               enum intel_dpll_id id)
{
        u32 fuse_strap = intel_de_read(dev_priv, FUSE_STRAP);
        u32 ctl = intel_de_read(dev_priv, WRPLL_CTL(id));

        if ((ctl & WRPLL_PLL_ENABLE) == 0)
                return false;

        if ((ctl & WRPLL_REF_MASK) == WRPLL_REF_PCH_SSC)
                return true;

        if ((IS_BROADWELL(dev_priv) || IS_HSW_ULT(dev_priv)) &&
            (ctl & WRPLL_REF_MASK) == WRPLL_REF_MUXED_SSC_BDW &&
            (fuse_strap & HSW_CPU_SSC_ENABLE) == 0)
                return true;

        return false;
}

static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        bool has_fdi = false;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_ANALOG:
                        has_fdi = true;
                        break;
                default:
                        break;
                }
        }

        /*
         * The BIOS may have decided to use the PCH SSC
         * reference so we must not disable it until the
         * relevant PLLs have stopped relying on it. We'll
         * just leave the PCH SSC reference enabled in case
         * any active PLL is using it. It will get disabled
         * after runtime suspend if we don't have FDI.
         *
         * TODO: Move the whole reference clock handling
         * to the modeset sequence proper so that we can
         * actually enable/disable/reconfigure these things
         * safely. To do that we need to introduce a real
         * clock hierarchy. That would also allow us to do
         * clock bending finally.
         */
        dev_priv->pch_ssc_use = 0;

        if (spll_uses_pch_ssc(dev_priv)) {
                drm_dbg_kms(&dev_priv->drm, "SPLL using PCH SSC\n");
                dev_priv->pch_ssc_use |= BIT(DPLL_ID_SPLL);
        }

        if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL1)) {
                drm_dbg_kms(&dev_priv->drm, "WRPLL1 using PCH SSC\n");
                dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL1);
        }

        if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL2)) {
                drm_dbg_kms(&dev_priv->drm, "WRPLL2 using PCH SSC\n");
                dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL2);
        }

        if (dev_priv->pch_ssc_use)
                return;

        if (has_fdi) {
                lpt_bend_clkout_dp(dev_priv, 0);
                lpt_enable_clkout_dp(dev_priv, true, true);
        } else {
                lpt_disable_clkout_dp(dev_priv);
        }
}

/*
 * Initialize reference clocks when the driver loads
 */
void intel_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv))
                ilk_init_pch_refclk(dev_priv);
        else if (HAS_PCH_LPT(dev_priv))
                lpt_init_pch_refclk(dev_priv);
}

static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        u32 val;

        val = 0;

        switch (crtc_state->pipe_bpp) {
        case 18:
                val |= PIPECONF_6BPC;
                break;
        case 24:
                val |= PIPECONF_8BPC;
                break;
        case 30:
                val |= PIPECONF_10BPC;
                break;
        case 36:
                val |= PIPECONF_12BPC;
                break;
        default:
                /* Case prevented by intel_choose_pipe_bpp_dither. */
                BUG();
        }

        if (crtc_state->dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        /*
         * This would end up with an odd purple hue over
         * the entire display. Make sure we don't do it.
         */
        drm_WARN_ON(&dev_priv->drm, crtc_state->limited_color_range &&
                    crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);

        if (crtc_state->limited_color_range)
                val |= PIPECONF_COLOR_RANGE_SELECT;

        if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
                val |= PIPECONF_OUTPUT_COLORSPACE_YUV709;

        val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);

        val |= PIPECONF_FRAME_START_DELAY(0);

        intel_de_write(dev_priv, PIPECONF(pipe), val);
        intel_de_posting_read(dev_priv, PIPECONF(pipe));
}

static void hsw_set_pipeconf(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        u32 val = 0;

        if (IS_HASWELL(dev_priv) && crtc_state->dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        if (IS_HASWELL(dev_priv) &&
            crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
                val |= PIPECONF_OUTPUT_COLORSPACE_YUV_HSW;

        intel_de_write(dev_priv, PIPECONF(cpu_transcoder), val);
        intel_de_posting_read(dev_priv, PIPECONF(cpu_transcoder));
}

static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 val = 0;

        switch (crtc_state->pipe_bpp) {
        case 18:
                val |= PIPEMISC_DITHER_6_BPC;
                break;
        case 24:
                val |= PIPEMISC_DITHER_8_BPC;
                break;
        case 30:
                val |= PIPEMISC_DITHER_10_BPC;
                break;
        case 36:
                val |= PIPEMISC_DITHER_12_BPC;
                break;
        default:
                MISSING_CASE(crtc_state->pipe_bpp);
                break;
        }

        if (crtc_state->dither)
                val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;

        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
            crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
                val |= PIPEMISC_OUTPUT_COLORSPACE_YUV;

        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
                val |= PIPEMISC_YUV420_ENABLE |
                        PIPEMISC_YUV420_MODE_FULL_BLEND;

        if (INTEL_GEN(dev_priv) >= 11 &&
            (crtc_state->active_planes & ~(icl_hdr_plane_mask() |
                                           BIT(PLANE_CURSOR))) == 0)
                val |= PIPEMISC_HDR_MODE_PRECISION;

        if (INTEL_GEN(dev_priv) >= 12)
                val |= PIPEMISC_PIXEL_ROUNDING_TRUNC;

        intel_de_write(dev_priv, PIPEMISC(crtc->pipe), val);
}

int bdw_get_pipemisc_bpp(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPEMISC(crtc->pipe));

        switch (tmp & PIPEMISC_DITHER_BPC_MASK) {
        case PIPEMISC_DITHER_6_BPC:
                return 18;
        case PIPEMISC_DITHER_8_BPC:
                return 24;
        case PIPEMISC_DITHER_10_BPC:
                return 30;
        case PIPEMISC_DITHER_12_BPC:
                return 36;
        default:
                MISSING_CASE(tmp);
                return 0;
        }
}

int ilk_get_lanes_required(int target_clock, int link_bw, int bpp)
{
        /*
         * Account for spread spectrum to avoid
         * oversubscribing the link. Max center spread
         * is 2.5%; use 5% for safety's sake.
         */
        u32 bps = target_clock * bpp * 21 / 20;
        return DIV_ROUND_UP(bps, link_bw * 8);
}

static bool ilk_needs_fb_cb_tune(struct dpll *dpll, int factor)
{
        return i9xx_dpll_compute_m(dpll) < factor * dpll->n;
}

static void ilk_compute_dpll(struct intel_crtc *crtc,
                             struct intel_crtc_state *crtc_state,
                             struct dpll *reduced_clock)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 dpll, fp, fp2;
        int factor;

        /* Enable autotuning of the PLL clock (if permissible) */
        factor = 21;
        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if ((intel_panel_use_ssc(dev_priv) &&
                     dev_priv->vbt.lvds_ssc_freq == 100000) ||
                    (HAS_PCH_IBX(dev_priv) &&
                     intel_is_dual_link_lvds(dev_priv)))
                        factor = 25;
        } else if (crtc_state->sdvo_tv_clock) {
                factor = 20;
        }

        fp = i9xx_dpll_compute_fp(&crtc_state->dpll);

        if (ilk_needs_fb_cb_tune(&crtc_state->dpll, factor))
                fp |= FP_CB_TUNE;

        if (reduced_clock) {
                fp2 = i9xx_dpll_compute_fp(reduced_clock);

                if (reduced_clock->m < factor * reduced_clock->n)
                        fp2 |= FP_CB_TUNE;
        } else {
                fp2 = fp;
        }

        dpll = 0;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS))
                dpll |= DPLLB_MODE_LVDS;
        else
                dpll |= DPLLB_MODE_DAC_SERIAL;

        dpll |= (crtc_state->pixel_multiplier - 1)
                << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO) ||
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        if (intel_crtc_has_dp_encoder(crtc_state))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /*
         * The high speed IO clock is only really required for
         * SDVO/HDMI/DP, but we also enable it for CRT to make it
         * possible to share the DPLL between CRT and HDMI. Enabling
         * the clock needlessly does no real harm, except use up a
         * bit of power potentially.
         *
         * We'll limit this to IVB with 3 pipes, since it has only two
         * DPLLs and so DPLL sharing is the only way to get three pipes
         * driving PCH ports at the same time. On SNB we could do this,
         * and potentially avoid enabling the second DPLL, but it's not
         * clear if it''s a win or loss power wise. No point in doing
         * this on ILK at all since it has a fixed DPLL<->pipe mapping.
         */
        if (INTEL_NUM_PIPES(dev_priv) == 3 &&
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /* compute bitmask from p1 value */
        dpll |= (1 << (crtc_state->dpll.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
        /* also FPA1 */
        dpll |= (1 << (crtc_state->dpll.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;

        switch (crtc_state->dpll.p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
            intel_panel_use_ssc(dev_priv))
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;

        crtc_state->dpll_hw_state.dpll = dpll;
        crtc_state->dpll_hw_state.fp0 = fp;
        crtc_state->dpll_hw_state.fp1 = fp2;
}

static int ilk_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->uapi.state);
        const struct intel_limit *limit;
        int refclk = 120000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        /* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
        if (!crtc_state->has_pch_encoder)
                return 0;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "using SSC reference clock of %d kHz\n",
                                    dev_priv->vbt.lvds_ssc_freq);
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                }

                if (intel_is_dual_link_lvds(dev_priv)) {
                        if (refclk == 100000)
                                limit = &ilk_limits_dual_lvds_100m;
                        else
                                limit = &ilk_limits_dual_lvds;
                } else {
                        if (refclk == 100000)
                                limit = &ilk_limits_single_lvds_100m;
                        else
                                limit = &ilk_limits_single_lvds;
                }
        } else {
                limit = &ilk_limits_dac;
        }

        if (!crtc_state->clock_set &&
            !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                drm_err(&dev_priv->drm,
                        "Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        ilk_compute_dpll(crtc, crtc_state, NULL);

        if (!intel_reserve_shared_dplls(state, crtc, NULL)) {
                drm_dbg_kms(&dev_priv->drm,
                            "failed to find PLL for pipe %c\n",
                            pipe_name(crtc->pipe));
                return -EINVAL;
        }

        return 0;
}

static void intel_pch_transcoder_get_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;

        m_n->link_m = intel_de_read(dev_priv, PCH_TRANS_LINK_M1(pipe));
        m_n->link_n = intel_de_read(dev_priv, PCH_TRANS_LINK_N1(pipe));
        m_n->gmch_m = intel_de_read(dev_priv, PCH_TRANS_DATA_M1(pipe))
                & ~TU_SIZE_MASK;
        m_n->gmch_n = intel_de_read(dev_priv, PCH_TRANS_DATA_N1(pipe));
        m_n->tu = ((intel_de_read(dev_priv, PCH_TRANS_DATA_M1(pipe))
                    & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
}

static void intel_cpu_transcoder_get_m_n(struct intel_crtc *crtc,
                                         enum transcoder transcoder,
                                         struct intel_link_m_n *m_n,
                                         struct intel_link_m_n *m2_n2)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (INTEL_GEN(dev_priv) >= 5) {
                m_n->link_m = intel_de_read(dev_priv,
                                            PIPE_LINK_M1(transcoder));
                m_n->link_n = intel_de_read(dev_priv,
                                            PIPE_LINK_N1(transcoder));
                m_n->gmch_m = intel_de_read(dev_priv,
                                            PIPE_DATA_M1(transcoder))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = intel_de_read(dev_priv,
                                            PIPE_DATA_N1(transcoder));
                m_n->tu = ((intel_de_read(dev_priv, PIPE_DATA_M1(transcoder))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;

                if (m2_n2 && transcoder_has_m2_n2(dev_priv, transcoder)) {
                        m2_n2->link_m = intel_de_read(dev_priv,
                                                      PIPE_LINK_M2(transcoder));
                        m2_n2->link_n = intel_de_read(dev_priv,
                                                             PIPE_LINK_N2(transcoder));
                        m2_n2->gmch_m = intel_de_read(dev_priv,
                                                             PIPE_DATA_M2(transcoder))
                                        & ~TU_SIZE_MASK;
                        m2_n2->gmch_n = intel_de_read(dev_priv,
                                                             PIPE_DATA_N2(transcoder));
                        m2_n2->tu = ((intel_de_read(dev_priv, PIPE_DATA_M2(transcoder))
                                        & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
                }
        } else {
                m_n->link_m = intel_de_read(dev_priv, PIPE_LINK_M_G4X(pipe));
                m_n->link_n = intel_de_read(dev_priv, PIPE_LINK_N_G4X(pipe));
                m_n->gmch_m = intel_de_read(dev_priv, PIPE_DATA_M_G4X(pipe))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = intel_de_read(dev_priv, PIPE_DATA_N_G4X(pipe));
                m_n->tu = ((intel_de_read(dev_priv, PIPE_DATA_M_G4X(pipe))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
        }
}

void intel_dp_get_m_n(struct intel_crtc *crtc,
                      struct intel_crtc_state *pipe_config)
{
        if (pipe_config->has_pch_encoder)
                intel_pch_transcoder_get_m_n(crtc, &pipe_config->dp_m_n);
        else
                intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                             &pipe_config->dp_m_n,
                                             &pipe_config->dp_m2_n2);
}

static void ilk_get_fdi_m_n_config(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                     &pipe_config->fdi_m_n, NULL);
}

static void ilk_get_pfit_pos_size(struct intel_crtc_state *crtc_state,
                                  u32 pos, u32 size)
{
        drm_rect_init(&crtc_state->pch_pfit.dst,
                      pos >> 16, pos & 0xffff,
                      size >> 16, size & 0xffff);
}

static void skl_get_pfit_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state;
        int id = -1;
        int i;

        /* find scaler attached to this pipe */
        for (i = 0; i < crtc->num_scalers; i++) {
                u32 ctl, pos, size;

                ctl = intel_de_read(dev_priv, SKL_PS_CTRL(crtc->pipe, i));
                if ((ctl & (PS_SCALER_EN | PS_PLANE_SEL_MASK)) != PS_SCALER_EN)
                        continue;

                id = i;
                crtc_state->pch_pfit.enabled = true;

                pos = intel_de_read(dev_priv, SKL_PS_WIN_POS(crtc->pipe, i));
                size = intel_de_read(dev_priv, SKL_PS_WIN_SZ(crtc->pipe, i));

                ilk_get_pfit_pos_size(crtc_state, pos, size);

                scaler_state->scalers[i].in_use = true;
                break;
        }

        scaler_state->scaler_id = id;
        if (id >= 0)
                scaler_state->scaler_users |= (1 << SKL_CRTC_INDEX);
        else
                scaler_state->scaler_users &= ~(1 << SKL_CRTC_INDEX);
}

static void
skl_get_initial_plane_config(struct intel_crtc *crtc,
                             struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);
        enum plane_id plane_id = plane->id;
        enum pipe pipe;
        u32 val, base, offset, stride_mult, tiling, alpha;
        int fourcc, pixel_format;
        unsigned int aligned_height;
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;

        if (!plane->get_hw_state(plane, &pipe))
                return;

        drm_WARN_ON(dev, pipe != crtc->pipe);

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                drm_dbg_kms(&dev_priv->drm, "failed to alloc fb\n");
                return;
        }

        fb = &intel_fb->base;

        fb->dev = dev;

        val = intel_de_read(dev_priv, PLANE_CTL(pipe, plane_id));

        if (INTEL_GEN(dev_priv) >= 11)
                pixel_format = val & ICL_PLANE_CTL_FORMAT_MASK;
        else
                pixel_format = val & PLANE_CTL_FORMAT_MASK;

        if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
                alpha = intel_de_read(dev_priv,
                                      PLANE_COLOR_CTL(pipe, plane_id));
                alpha &= PLANE_COLOR_ALPHA_MASK;
        } else {
                alpha = val & PLANE_CTL_ALPHA_MASK;
        }

        fourcc = skl_format_to_fourcc(pixel_format,
                                      val & PLANE_CTL_ORDER_RGBX, alpha);
        fb->format = drm_format_info(fourcc);

        tiling = val & PLANE_CTL_TILED_MASK;
        switch (tiling) {
        case PLANE_CTL_TILED_LINEAR:
                fb->modifier = DRM_FORMAT_MOD_LINEAR;
                break;
        case PLANE_CTL_TILED_X:
                plane_config->tiling = I915_TILING_X;
                fb->modifier = I915_FORMAT_MOD_X_TILED;
                break;
        case PLANE_CTL_TILED_Y:
                plane_config->tiling = I915_TILING_Y;
                if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
                        fb->modifier = INTEL_GEN(dev_priv) >= 12 ?
                                I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS :
                                I915_FORMAT_MOD_Y_TILED_CCS;
                else if (val & PLANE_CTL_MEDIA_DECOMPRESSION_ENABLE)
                        fb->modifier = I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS;
                else
                        fb->modifier = I915_FORMAT_MOD_Y_TILED;
                break;
        case PLANE_CTL_TILED_YF:
                if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
                        fb->modifier = I915_FORMAT_MOD_Yf_TILED_CCS;
                else
                        fb->modifier = I915_FORMAT_MOD_Yf_TILED;
                break;
        default:
                MISSING_CASE(tiling);
                goto error;
        }

        /*
         * DRM_MODE_ROTATE_ is counter clockwise to stay compatible with Xrandr
         * while i915 HW rotation is clockwise, thats why this swapping.
         */
        switch (val & PLANE_CTL_ROTATE_MASK) {
        case PLANE_CTL_ROTATE_0:
                plane_config->rotation = DRM_MODE_ROTATE_0;
                break;
        case PLANE_CTL_ROTATE_90:
                plane_config->rotation = DRM_MODE_ROTATE_270;
                break;
        case PLANE_CTL_ROTATE_180:
                plane_config->rotation = DRM_MODE_ROTATE_180;
                break;
        case PLANE_CTL_ROTATE_270:
                plane_config->rotation = DRM_MODE_ROTATE_90;
                break;
        }

        if (INTEL_GEN(dev_priv) >= 10 &&
            val & PLANE_CTL_FLIP_HORIZONTAL)
                plane_config->rotation |= DRM_MODE_REFLECT_X;

        base = intel_de_read(dev_priv, PLANE_SURF(pipe, plane_id)) & 0xfffff000;
        plane_config->base = base;

        offset = intel_de_read(dev_priv, PLANE_OFFSET(pipe, plane_id));

        val = intel_de_read(dev_priv, PLANE_SIZE(pipe, plane_id));
        fb->height = ((val >> 16) & 0xffff) + 1;
        fb->width = ((val >> 0) & 0xffff) + 1;

        val = intel_de_read(dev_priv, PLANE_STRIDE(pipe, plane_id));
        stride_mult = skl_plane_stride_mult(fb, 0, DRM_MODE_ROTATE_0);
        fb->pitches[0] = (val & 0x3ff) * stride_mult;

        aligned_height = intel_fb_align_height(fb, 0, fb->height);

        plane_config->size = fb->pitches[0] * aligned_height;

        drm_dbg_kms(&dev_priv->drm,
                    "%s/%s with fb: size=%dx%d@%d, offset=%x, pitch %d, size 0x%x\n",
                    crtc->base.name, plane->base.name, fb->width, fb->height,
                    fb->format->cpp[0] * 8, base, fb->pitches[0],
                    plane_config->size);

        plane_config->fb = intel_fb;
        return;

error:
        kfree(intel_fb);
}

static void ilk_get_pfit_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 ctl, pos, size;

        ctl = intel_de_read(dev_priv, PF_CTL(crtc->pipe));
        if ((ctl & PF_ENABLE) == 0)
                return;

        crtc_state->pch_pfit.enabled = true;

        pos = intel_de_read(dev_priv, PF_WIN_POS(crtc->pipe));
        size = intel_de_read(dev_priv, PF_WIN_SZ(crtc->pipe));

        ilk_get_pfit_pos_size(crtc_state, pos, size);

        /*
         * We currently do not free assignements of panel fitters on
         * ivb/hsw (since we don't use the higher upscaling modes which
         * differentiates them) so just WARN about this case for now.
         */
        drm_WARN_ON(&dev_priv->drm, IS_GEN(dev_priv, 7) &&
                    (ctl & PF_PIPE_SEL_MASK_IVB) != PF_PIPE_SEL_IVB(crtc->pipe));
}

static bool ilk_get_pipe_config(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;
        u32 tmp;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = NULL;

        ret = false;
        tmp = intel_de_read(dev_priv, PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                goto out;

        switch (tmp & PIPECONF_BPC_MASK) {
        case PIPECONF_6BPC:
                pipe_config->pipe_bpp = 18;
                break;
        case PIPECONF_8BPC:
                pipe_config->pipe_bpp = 24;
                break;
        case PIPECONF_10BPC:
                pipe_config->pipe_bpp = 30;
                break;
        case PIPECONF_12BPC:
                pipe_config->pipe_bpp = 36;
                break;
        default:
                break;
        }

        if (tmp & PIPECONF_COLOR_RANGE_SELECT)
                pipe_config->limited_color_range = true;

        switch (tmp & PIPECONF_OUTPUT_COLORSPACE_MASK) {
        case PIPECONF_OUTPUT_COLORSPACE_YUV601:
        case PIPECONF_OUTPUT_COLORSPACE_YUV709:
                pipe_config->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
                break;
        default:
                pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
                break;
        }

        pipe_config->gamma_mode = (tmp & PIPECONF_GAMMA_MODE_MASK_ILK) >>
                PIPECONF_GAMMA_MODE_SHIFT;

        pipe_config->csc_mode = intel_de_read(dev_priv,
                                              PIPE_CSC_MODE(crtc->pipe));

        i9xx_get_pipe_color_config(pipe_config);
        intel_color_get_config(pipe_config);

        if (intel_de_read(dev_priv, PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
                struct intel_shared_dpll *pll;
                enum intel_dpll_id pll_id;

                pipe_config->has_pch_encoder = true;

                tmp = intel_de_read(dev_priv, FDI_RX_CTL(crtc->pipe));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ilk_get_fdi_m_n_config(crtc, pipe_config);

                if (HAS_PCH_IBX(dev_priv)) {
                        /*
                         * The pipe->pch transcoder and pch transcoder->pll
                         * mapping is fixed.
                         */
                        pll_id = (enum intel_dpll_id) crtc->pipe;
                } else {
                        tmp = intel_de_read(dev_priv, PCH_DPLL_SEL);
                        if (tmp & TRANS_DPLLB_SEL(crtc->pipe))
                                pll_id = DPLL_ID_PCH_PLL_B;
                        else
                                pll_id= DPLL_ID_PCH_PLL_A;
                }

                pipe_config->shared_dpll =
                        intel_get_shared_dpll_by_id(dev_priv, pll_id);
                pll = pipe_config->shared_dpll;

                drm_WARN_ON(dev, !pll->info->funcs->get_hw_state(dev_priv, pll,
                                                 &pipe_config->dpll_hw_state));

                tmp = pipe_config->dpll_hw_state.dpll;
                pipe_config->pixel_multiplier =
                        ((tmp & PLL_REF_SDVO_HDMI_MULTIPLIER_MASK)
                         >> PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT) + 1;

                ilk_pch_clock_get(crtc, pipe_config);
        } else {
                pipe_config->pixel_multiplier = 1;
        }

        intel_get_pipe_timings(crtc, pipe_config);
        intel_get_pipe_src_size(crtc, pipe_config);

        ilk_get_pfit_config(pipe_config);

        ret = true;

out:
        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

static int hsw_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->uapi.state);

        if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI) ||
            INTEL_GEN(dev_priv) >= 11) {
                struct intel_encoder *encoder =
                        intel_get_crtc_new_encoder(state, crtc_state);

                if (!intel_reserve_shared_dplls(state, crtc, encoder)) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "failed to find PLL for pipe %c\n",
                                    pipe_name(crtc->pipe));
                        return -EINVAL;
                }
        }

        return 0;
}

static void cnl_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
                            struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        u32 temp;

        temp = intel_de_read(dev_priv, DPCLKA_CFGCR0) & DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port);
        id = temp >> DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port);

        if (drm_WARN_ON(&dev_priv->drm, id < SKL_DPLL0 || id > SKL_DPLL2))
                return;

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void icl_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
                            struct intel_crtc_state *pipe_config)
{
        enum phy phy = intel_port_to_phy(dev_priv, port);
        enum icl_port_dpll_id port_dpll_id;
        enum intel_dpll_id id;
        u32 temp;

        if (intel_phy_is_combo(dev_priv, phy)) {
                temp = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0) &
                        ICL_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
                id = temp >> ICL_DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(phy);
                port_dpll_id = ICL_PORT_DPLL_DEFAULT;
        } else if (intel_phy_is_tc(dev_priv, phy)) {
                u32 clk_sel = intel_de_read(dev_priv, DDI_CLK_SEL(port)) & DDI_CLK_SEL_MASK;

                if (clk_sel == DDI_CLK_SEL_MG) {
                        id = icl_tc_port_to_pll_id(intel_port_to_tc(dev_priv,
                                                                    port));
                        port_dpll_id = ICL_PORT_DPLL_MG_PHY;
                } else {
                        drm_WARN_ON(&dev_priv->drm,
                                    clk_sel < DDI_CLK_SEL_TBT_162);
                        id = DPLL_ID_ICL_TBTPLL;
                        port_dpll_id = ICL_PORT_DPLL_DEFAULT;
                }
        } else {
                drm_WARN(&dev_priv->drm, 1, "Invalid port %x\n", port);
                return;
        }

        pipe_config->icl_port_dplls[port_dpll_id].pll =
                intel_get_shared_dpll_by_id(dev_priv, id);

        icl_set_active_port_dpll(pipe_config, port_dpll_id);
}

static void bxt_get_ddi_pll(struct drm_i915_private *dev_priv,
                                enum port port,
                                struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;

        switch (port) {
        case PORT_A:
                id = DPLL_ID_SKL_DPLL0;
                break;
        case PORT_B:
                id = DPLL_ID_SKL_DPLL1;
                break;
        case PORT_C:
                id = DPLL_ID_SKL_DPLL2;
                break;
        default:
                drm_err(&dev_priv->drm, "Incorrect port type\n");
                return;
        }

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void skl_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
                            struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        u32 temp;

        temp = intel_de_read(dev_priv, DPLL_CTRL2) & DPLL_CTRL2_DDI_CLK_SEL_MASK(port);
        id = temp >> (port * 3 + 1);

        if (drm_WARN_ON(&dev_priv->drm, id < SKL_DPLL0 || id > SKL_DPLL3))
                return;

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void hsw_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
                            struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        u32 ddi_pll_sel = intel_de_read(dev_priv, PORT_CLK_SEL(port));

        switch (ddi_pll_sel) {
        case PORT_CLK_SEL_WRPLL1:
                id = DPLL_ID_WRPLL1;
                break;
        case PORT_CLK_SEL_WRPLL2:
                id = DPLL_ID_WRPLL2;
                break;
        case PORT_CLK_SEL_SPLL:
                id = DPLL_ID_SPLL;
                break;
        case PORT_CLK_SEL_LCPLL_810:
                id = DPLL_ID_LCPLL_810;
                break;
        case PORT_CLK_SEL_LCPLL_1350:
                id = DPLL_ID_LCPLL_1350;
                break;
        case PORT_CLK_SEL_LCPLL_2700:
                id = DPLL_ID_LCPLL_2700;
                break;
        default:
                MISSING_CASE(ddi_pll_sel);
                /* fall through */
        case PORT_CLK_SEL_NONE:
                return;
        }

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static bool hsw_get_transcoder_state(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config,
                                     u64 *power_domain_mask,
                                     intel_wakeref_t *wakerefs)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        unsigned long panel_transcoder_mask = BIT(TRANSCODER_EDP);
        unsigned long enabled_panel_transcoders = 0;
        enum transcoder panel_transcoder;
        intel_wakeref_t wf;
        u32 tmp;

        if (INTEL_GEN(dev_priv) >= 11)
                panel_transcoder_mask |=
                        BIT(TRANSCODER_DSI_0) | BIT(TRANSCODER_DSI_1);

        /*
         * The pipe->transcoder mapping is fixed with the exception of the eDP
         * and DSI transcoders handled below.
         */
        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;

        /*
         * XXX: Do intel_display_power_get_if_enabled before reading this (for
         * consistency and less surprising code; it's in always on power).
         */
        for_each_cpu_transcoder_masked(dev_priv, panel_transcoder,
                                       panel_transcoder_mask) {
                bool force_thru = false;
                enum pipe trans_pipe;

                tmp = intel_de_read(dev_priv,
                                    TRANS_DDI_FUNC_CTL(panel_transcoder));
                if (!(tmp & TRANS_DDI_FUNC_ENABLE))
                        continue;

                /*
                 * Log all enabled ones, only use the first one.
                 *
                 * FIXME: This won't work for two separate DSI displays.
                 */
                enabled_panel_transcoders |= BIT(panel_transcoder);
                if (enabled_panel_transcoders != BIT(panel_transcoder))
                        continue;

                switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
                default:
                        drm_WARN(dev, 1,
                                 "unknown pipe linked to transcoder %s\n",
                                 transcoder_name(panel_transcoder));
                        /* fall through */
                case TRANS_DDI_EDP_INPUT_A_ONOFF:
                        force_thru = true;
                        /* fall through */
                case TRANS_DDI_EDP_INPUT_A_ON:
                        trans_pipe = PIPE_A;
                        break;
                case TRANS_DDI_EDP_INPUT_B_ONOFF:
                        trans_pipe = PIPE_B;
                        break;
                case TRANS_DDI_EDP_INPUT_C_ONOFF:
                        trans_pipe = PIPE_C;
                        break;
                case TRANS_DDI_EDP_INPUT_D_ONOFF:
                        trans_pipe = PIPE_D;
                        break;
                }

                if (trans_pipe == crtc->pipe) {
                        pipe_config->cpu_transcoder = panel_transcoder;
                        pipe_config->pch_pfit.force_thru = force_thru;
                }
        }

        /*
         * Valid combos: none, eDP, DSI0, DSI1, DSI0+DSI1
         */
        drm_WARN_ON(dev, (enabled_panel_transcoders & BIT(TRANSCODER_EDP)) &&
                    enabled_panel_transcoders != BIT(TRANSCODER_EDP));

        power_domain = POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder);
        drm_WARN_ON(dev, *power_domain_mask & BIT_ULL(power_domain));

        wf = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wf)
                return false;

        wakerefs[power_domain] = wf;
        *power_domain_mask |= BIT_ULL(power_domain);

        tmp = intel_de_read(dev_priv, PIPECONF(pipe_config->cpu_transcoder));

        return tmp & PIPECONF_ENABLE;
}

static bool bxt_get_dsi_transcoder_state(struct intel_crtc *crtc,
                                         struct intel_crtc_state *pipe_config,
                                         u64 *power_domain_mask,
                                         intel_wakeref_t *wakerefs)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        enum transcoder cpu_transcoder;
        intel_wakeref_t wf;
        enum port port;
        u32 tmp;

        for_each_port_masked(port, BIT(PORT_A) | BIT(PORT_C)) {
                if (port == PORT_A)
                        cpu_transcoder = TRANSCODER_DSI_A;
                else
                        cpu_transcoder = TRANSCODER_DSI_C;

                power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
                drm_WARN_ON(dev, *power_domain_mask & BIT_ULL(power_domain));

                wf = intel_display_power_get_if_enabled(dev_priv, power_domain);
                if (!wf)
                        continue;

                wakerefs[power_domain] = wf;
                *power_domain_mask |= BIT_ULL(power_domain);

                /*
                 * The PLL needs to be enabled with a valid divider
                 * configuration, otherwise accessing DSI registers will hang
                 * the machine. See BSpec North Display Engine
                 * registers/MIPI[BXT]. We can break out here early, since we
                 * need the same DSI PLL to be enabled for both DSI ports.
                 */
                if (!bxt_dsi_pll_is_enabled(dev_priv))
                        break;

                /* XXX: this works for video mode only */
                tmp = intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port));
                if (!(tmp & DPI_ENABLE))
                        continue;

                tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
                if ((tmp & BXT_PIPE_SELECT_MASK) != BXT_PIPE_SELECT(crtc->pipe))
                        continue;

                pipe_config->cpu_transcoder = cpu_transcoder;
                break;
        }

        return transcoder_is_dsi(pipe_config->cpu_transcoder);
}

static void hsw_get_ddi_port_state(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
        struct intel_shared_dpll *pll;
        enum port port;
        u32 tmp;

        if (transcoder_is_dsi(cpu_transcoder)) {
                port = (cpu_transcoder == TRANSCODER_DSI_A) ?
                                                PORT_A : PORT_B;
        } else {
                tmp = intel_de_read(dev_priv,
                                    TRANS_DDI_FUNC_CTL(cpu_transcoder));
                if (INTEL_GEN(dev_priv) >= 12)
                        port = TGL_TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
                else
                        port = TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
        }

        if (INTEL_GEN(dev_priv) >= 11)
                icl_get_ddi_pll(dev_priv, port, pipe_config);
        else if (IS_CANNONLAKE(dev_priv))
                cnl_get_ddi_pll(dev_priv, port, pipe_config);
        else if (IS_GEN9_BC(dev_priv))
                skl_get_ddi_pll(dev_priv, port, pipe_config);
        else if (IS_GEN9_LP(dev_priv))
                bxt_get_ddi_pll(dev_priv, port, pipe_config);
        else
                hsw_get_ddi_pll(dev_priv, port, pipe_config);

        pll = pipe_config->shared_dpll;
        if (pll) {
                drm_WARN_ON(&dev_priv->drm,
                            !pll->info->funcs->get_hw_state(dev_priv, pll,
                                                &pipe_config->dpll_hw_state));
        }

        /*
         * Haswell has only FDI/PCH transcoder A. It is which is connected to
         * DDI E. So just check whether this pipe is wired to DDI E and whether
         * the PCH transcoder is on.
         */
        if (INTEL_GEN(dev_priv) < 9 &&
            (port == PORT_E) && intel_de_read(dev_priv, LPT_TRANSCONF) & TRANS_ENABLE) {
                pipe_config->has_pch_encoder = true;

                tmp = intel_de_read(dev_priv, FDI_RX_CTL(PIPE_A));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ilk_get_fdi_m_n_config(crtc, pipe_config);
        }
}

static bool hsw_get_pipe_config(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        intel_wakeref_t wakerefs[POWER_DOMAIN_NUM], wf;
        enum intel_display_power_domain power_domain;
        u64 power_domain_mask;
        bool active;
        u32 tmp;

        pipe_config->master_transcoder = INVALID_TRANSCODER;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        wf = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wf)
                return false;

        wakerefs[power_domain] = wf;
        power_domain_mask = BIT_ULL(power_domain);

        pipe_config->shared_dpll = NULL;

        active = hsw_get_transcoder_state(crtc, pipe_config,
                                          &power_domain_mask, wakerefs);

        if (IS_GEN9_LP(dev_priv) &&
            bxt_get_dsi_transcoder_state(crtc, pipe_config,
                                         &power_domain_mask, wakerefs)) {
                drm_WARN_ON(&dev_priv->drm, active);
                active = true;
        }

        if (!active)
                goto out;

        if (!transcoder_is_dsi(pipe_config->cpu_transcoder) ||
            INTEL_GEN(dev_priv) >= 11) {
                hsw_get_ddi_port_state(crtc, pipe_config);
                intel_get_pipe_timings(crtc, pipe_config);
        }

        intel_get_pipe_src_size(crtc, pipe_config);

        if (IS_HASWELL(dev_priv)) {
                u32 tmp = intel_de_read(dev_priv,
                                        PIPECONF(pipe_config->cpu_transcoder));

                if (tmp & PIPECONF_OUTPUT_COLORSPACE_YUV_HSW)
                        pipe_config->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
                else
                        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        } else {
                pipe_config->output_format =
                        bdw_get_pipemisc_output_format(crtc);

                /*
                 * Currently there is no interface defined to
                 * check user preference between RGB/YCBCR444
                 * or YCBCR420. So the only possible case for
                 * YCBCR444 usage is driving YCBCR420 output
                 * with LSPCON, when pipe is configured for
                 * YCBCR444 output and LSPCON takes care of
                 * downsampling it.
                 */
                pipe_config->lspcon_downsampling =
                        pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR444;
        }

        pipe_config->gamma_mode = intel_de_read(dev_priv,
                                                GAMMA_MODE(crtc->pipe));

        pipe_config->csc_mode = intel_de_read(dev_priv,
                                              PIPE_CSC_MODE(crtc->pipe));

        if (INTEL_GEN(dev_priv) >= 9) {
                tmp = intel_de_read(dev_priv, SKL_BOTTOM_COLOR(crtc->pipe));

                if (tmp & SKL_BOTTOM_COLOR_GAMMA_ENABLE)
                        pipe_config->gamma_enable = true;

                if (tmp & SKL_BOTTOM_COLOR_CSC_ENABLE)
                        pipe_config->csc_enable = true;
        } else {
                i9xx_get_pipe_color_config(pipe_config);
        }

        intel_color_get_config(pipe_config);

        tmp = intel_de_read(dev_priv, WM_LINETIME(crtc->pipe));
        pipe_config->linetime = REG_FIELD_GET(HSW_LINETIME_MASK, tmp);
        if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                pipe_config->ips_linetime =
                        REG_FIELD_GET(HSW_IPS_LINETIME_MASK, tmp);

        power_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
        drm_WARN_ON(&dev_priv->drm, power_domain_mask & BIT_ULL(power_domain));

        wf = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (wf) {
                wakerefs[power_domain] = wf;
                power_domain_mask |= BIT_ULL(power_domain);

                if (INTEL_GEN(dev_priv) >= 9)
                        skl_get_pfit_config(pipe_config);
                else
                        ilk_get_pfit_config(pipe_config);
        }

        if (hsw_crtc_supports_ips(crtc)) {
                if (IS_HASWELL(dev_priv))
                        pipe_config->ips_enabled = intel_de_read(dev_priv,
                                                                 IPS_CTL) & IPS_ENABLE;
                else {
                        /*
                         * We cannot readout IPS state on broadwell, set to
                         * true so we can set it to a defined state on first
                         * commit.
                         */
                        pipe_config->ips_enabled = true;
                }
        }

        if (pipe_config->cpu_transcoder != TRANSCODER_EDP &&
            !transcoder_is_dsi(pipe_config->cpu_transcoder)) {
                pipe_config->pixel_multiplier =
                        intel_de_read(dev_priv,
                                      PIPE_MULT(pipe_config->cpu_transcoder)) + 1;
        } else {
                pipe_config->pixel_multiplier = 1;
        }

out:
        for_each_power_domain(power_domain, power_domain_mask)
                intel_display_power_put(dev_priv,
                                        power_domain, wakerefs[power_domain]);

        return active;
}

static u32 intel_cursor_base(const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        const struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        u32 base;

        if (INTEL_INFO(dev_priv)->display.cursor_needs_physical)
                base = sg_dma_address(obj->mm.pages->sgl);
        else
                base = intel_plane_ggtt_offset(plane_state);

        return base + plane_state->color_plane[0].offset;
}

static u32 intel_cursor_position(const struct intel_plane_state *plane_state)
{
        int x = plane_state->uapi.dst.x1;
        int y = plane_state->uapi.dst.y1;
        u32 pos = 0;

        if (x < 0) {
                pos |= CURSOR_POS_SIGN << CURSOR_X_SHIFT;
                x = -x;
        }
        pos |= x << CURSOR_X_SHIFT;

        if (y < 0) {
                pos |= CURSOR_POS_SIGN << CURSOR_Y_SHIFT;
                y = -y;
        }
        pos |= y << CURSOR_Y_SHIFT;

        return pos;
}

static bool intel_cursor_size_ok(const struct intel_plane_state *plane_state)
{
        const struct drm_mode_config *config =
                &plane_state->uapi.plane->dev->mode_config;
        int width = drm_rect_width(&plane_state->uapi.dst);
        int height = drm_rect_height(&plane_state->uapi.dst);

        return width > 0 && width <= config->cursor_width &&
                height > 0 && height <= config->cursor_height;
}

static int intel_cursor_check_surface(struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        unsigned int rotation = plane_state->hw.rotation;
        int src_x, src_y;
        u32 offset;
        int ret;

        ret = intel_plane_compute_gtt(plane_state);
        if (ret)
                return ret;

        if (!plane_state->uapi.visible)
                return 0;

        src_x = plane_state->uapi.src.x1 >> 16;
        src_y = plane_state->uapi.src.y1 >> 16;

        intel_add_fb_offsets(&src_x, &src_y, plane_state, 0);
        offset = intel_plane_compute_aligned_offset(&src_x, &src_y,
                                                    plane_state, 0);

        if (src_x != 0 || src_y != 0) {
                drm_dbg_kms(&dev_priv->drm,
                            "Arbitrary cursor panning not supported\n");
                return -EINVAL;
        }

        /*
         * Put the final coordinates back so that the src
         * coordinate checks will see the right values.
         */
        drm_rect_translate_to(&plane_state->uapi.src,
                              src_x << 16, src_y << 16);

        /* ILK+ do this automagically in hardware */
        if (HAS_GMCH(dev_priv) && rotation & DRM_MODE_ROTATE_180) {
                const struct drm_framebuffer *fb = plane_state->hw.fb;
                int src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
                int src_h = drm_rect_height(&plane_state->uapi.src) >> 16;

                offset += (src_h * src_w - 1) * fb->format->cpp[0];
        }

        plane_state->color_plane[0].offset = offset;
        plane_state->color_plane[0].x = src_x;
        plane_state->color_plane[0].y = src_y;

        return 0;
}

static int intel_check_cursor(struct intel_crtc_state *crtc_state,
                              struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        struct drm_i915_private *i915 = to_i915(plane_state->uapi.plane->dev);
        int ret;

        if (fb && fb->modifier != DRM_FORMAT_MOD_LINEAR) {
                drm_dbg_kms(&i915->drm, "cursor cannot be tiled\n");
                return -EINVAL;
        }

        ret = drm_atomic_helper_check_plane_state(&plane_state->uapi,
                                                  &crtc_state->uapi,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  true, true);
        if (ret)
                return ret;

        /* Use the unclipped src/dst rectangles, which we program to hw */
        plane_state->uapi.src = drm_plane_state_src(&plane_state->uapi);
        plane_state->uapi.dst = drm_plane_state_dest(&plane_state->uapi);

        ret = intel_cursor_check_surface(plane_state);
        if (ret)
                return ret;

        if (!plane_state->uapi.visible)
                return 0;

        ret = intel_plane_check_src_coordinates(plane_state);
        if (ret)
                return ret;

        return 0;
}

static unsigned int
i845_cursor_max_stride(struct intel_plane *plane,
                       u32 pixel_format, u64 modifier,
                       unsigned int rotation)
{
        return 2048;
}

static u32 i845_cursor_ctl_crtc(const struct intel_crtc_state *crtc_state)
{
        u32 cntl = 0;

        if (crtc_state->gamma_enable)
                cntl |= CURSOR_GAMMA_ENABLE;

        return cntl;
}

static u32 i845_cursor_ctl(const struct intel_crtc_state *crtc_state,
                           const struct intel_plane_state *plane_state)
{
        return CURSOR_ENABLE |
                CURSOR_FORMAT_ARGB |
                CURSOR_STRIDE(plane_state->color_plane[0].stride);
}

static bool i845_cursor_size_ok(const struct intel_plane_state *plane_state)
{
        int width = drm_rect_width(&plane_state->uapi.dst);

        /*
         * 845g/865g are only limited by the width of their cursors,
         * the height is arbitrary up to the precision of the register.
         */
        return intel_cursor_size_ok(plane_state) && IS_ALIGNED(width, 64);
}

static int i845_check_cursor(struct intel_crtc_state *crtc_state,
                             struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        struct drm_i915_private *i915 = to_i915(plane_state->uapi.plane->dev);
        int ret;

        ret = intel_check_cursor(crtc_state, plane_state);
        if (ret)
                return ret;

        /* if we want to turn off the cursor ignore width and height */
        if (!fb)
                return 0;

        /* Check for which cursor types we support */
        if (!i845_cursor_size_ok(plane_state)) {
                drm_dbg_kms(&i915->drm,
                            "Cursor dimension %dx%d not supported\n",
                            drm_rect_width(&plane_state->uapi.dst),
                            drm_rect_height(&plane_state->uapi.dst));
                return -EINVAL;
        }

        drm_WARN_ON(&i915->drm, plane_state->uapi.visible &&
                    plane_state->color_plane[0].stride != fb->pitches[0]);

        switch (fb->pitches[0]) {
        case 256:
        case 512:
        case 1024:
        case 2048:
                break;
        default:
                 drm_dbg_kms(&i915->drm, "Invalid cursor stride (%u)\n",
                             fb->pitches[0]);
                return -EINVAL;
        }

        plane_state->ctl = i845_cursor_ctl(crtc_state, plane_state);

        return 0;
}

static void i845_update_cursor(struct intel_plane *plane,
                               const struct intel_crtc_state *crtc_state,
                               const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        u32 cntl = 0, base = 0, pos = 0, size = 0;
        unsigned long irqflags;

        if (plane_state && plane_state->uapi.visible) {
                unsigned int width = drm_rect_width(&plane_state->uapi.dst);
                unsigned int height = drm_rect_height(&plane_state->uapi.dst);

                cntl = plane_state->ctl |
                        i845_cursor_ctl_crtc(crtc_state);

                size = (height << 12) | width;

                base = intel_cursor_base(plane_state);
                pos = intel_cursor_position(plane_state);
        }

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        /* On these chipsets we can only modify the base/size/stride
         * whilst the cursor is disabled.
         */
        if (plane->cursor.base != base ||
            plane->cursor.size != size ||
            plane->cursor.cntl != cntl) {
                intel_de_write_fw(dev_priv, CURCNTR(PIPE_A), 0);
                intel_de_write_fw(dev_priv, CURBASE(PIPE_A), base);
                intel_de_write_fw(dev_priv, CURSIZE, size);
                intel_de_write_fw(dev_priv, CURPOS(PIPE_A), pos);
                intel_de_write_fw(dev_priv, CURCNTR(PIPE_A), cntl);

                plane->cursor.base = base;
                plane->cursor.size = size;
                plane->cursor.cntl = cntl;
        } else {
                intel_de_write_fw(dev_priv, CURPOS(PIPE_A), pos);
        }

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void i845_disable_cursor(struct intel_plane *plane,
                                const struct intel_crtc_state *crtc_state)
{
        i845_update_cursor(plane, crtc_state, NULL);
}

static bool i845_cursor_get_hw_state(struct intel_plane *plane,
                                     enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(PIPE_A);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        ret = intel_de_read(dev_priv, CURCNTR(PIPE_A)) & CURSOR_ENABLE;

        *pipe = PIPE_A;

        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

static unsigned int
i9xx_cursor_max_stride(struct intel_plane *plane,
                       u32 pixel_format, u64 modifier,
                       unsigned int rotation)
{
        return plane->base.dev->mode_config.cursor_width * 4;
}

static u32 i9xx_cursor_ctl_crtc(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 cntl = 0;

        if (INTEL_GEN(dev_priv) >= 11)
                return cntl;

        if (crtc_state->gamma_enable)
                cntl = MCURSOR_GAMMA_ENABLE;

        if (crtc_state->csc_enable)
                cntl |= MCURSOR_PIPE_CSC_ENABLE;

        if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
                cntl |= MCURSOR_PIPE_SELECT(crtc->pipe);

        return cntl;
}

static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
                           const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        u32 cntl = 0;

        if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
                cntl |= MCURSOR_TRICKLE_FEED_DISABLE;

        switch (drm_rect_width(&plane_state->uapi.dst)) {
        case 64:
                cntl |= MCURSOR_MODE_64_ARGB_AX;
                break;
        case 128:
                cntl |= MCURSOR_MODE_128_ARGB_AX;
                break;
        case 256:
                cntl |= MCURSOR_MODE_256_ARGB_AX;
                break;
        default:
                MISSING_CASE(drm_rect_width(&plane_state->uapi.dst));
                return 0;
        }

        if (plane_state->hw.rotation & DRM_MODE_ROTATE_180)
                cntl |= MCURSOR_ROTATE_180;

        return cntl;
}

static bool i9xx_cursor_size_ok(const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->uapi.plane->dev);
        int width = drm_rect_width(&plane_state->uapi.dst);
        int height = drm_rect_height(&plane_state->uapi.dst);

        if (!intel_cursor_size_ok(plane_state))
                return false;

        /* Cursor width is limited to a few power-of-two sizes */
        switch (width) {
        case 256:
        case 128:
        case 64:
                break;
        default:
                return false;
        }

        /*
         * IVB+ have CUR_FBC_CTL which allows an arbitrary cursor
         * height from 8 lines up to the cursor width, when the
         * cursor is not rotated. Everything else requires square
         * cursors.
         */
        if (HAS_CUR_FBC(dev_priv) &&
            plane_state->hw.rotation & DRM_MODE_ROTATE_0) {
                if (height < 8 || height > width)
                        return false;
        } else {
                if (height != width)
                        return false;
        }

        return true;
}

static int i9xx_check_cursor(struct intel_crtc_state *crtc_state,
                             struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        enum pipe pipe = plane->pipe;
        int ret;

        ret = intel_check_cursor(crtc_state, plane_state);
        if (ret)
                return ret;

        /* if we want to turn off the cursor ignore width and height */
        if (!fb)
                return 0;

        /* Check for which cursor types we support */
        if (!i9xx_cursor_size_ok(plane_state)) {
                drm_dbg(&dev_priv->drm,
                        "Cursor dimension %dx%d not supported\n",
                        drm_rect_width(&plane_state->uapi.dst),
                        drm_rect_height(&plane_state->uapi.dst));
                return -EINVAL;
        }

        drm_WARN_ON(&dev_priv->drm, plane_state->uapi.visible &&
                    plane_state->color_plane[0].stride != fb->pitches[0]);

        if (fb->pitches[0] !=
            drm_rect_width(&plane_state->uapi.dst) * fb->format->cpp[0]) {
                drm_dbg_kms(&dev_priv->drm,
                            "Invalid cursor stride (%u) (cursor width %d)\n",
                            fb->pitches[0],
                            drm_rect_width(&plane_state->uapi.dst));
                return -EINVAL;
        }

        /*
         * There's something wrong with the cursor on CHV pipe C.
         * If it straddles the left edge of the screen then
         * moving it away from the edge or disabling it often
         * results in a pipe underrun, and often that can lead to
         * dead pipe (constant underrun reported, and it scans
         * out just a solid color). To recover from that, the
         * display power well must be turned off and on again.
         * Refuse the put the cursor into that compromised position.
         */
        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_C &&
            plane_state->uapi.visible && plane_state->uapi.dst.x1 < 0) {
                drm_dbg_kms(&dev_priv->drm,
                            "CHV cursor C not allowed to straddle the left screen edge\n");
                return -EINVAL;
        }

        plane_state->ctl = i9xx_cursor_ctl(crtc_state, plane_state);

        return 0;
}

static void i9xx_update_cursor(struct intel_plane *plane,
                               const struct intel_crtc_state *crtc_state,
                               const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum pipe pipe = plane->pipe;
        u32 cntl = 0, base = 0, pos = 0, fbc_ctl = 0;
        unsigned long irqflags;

        if (plane_state && plane_state->uapi.visible) {
                unsigned width = drm_rect_width(&plane_state->uapi.dst);
                unsigned height = drm_rect_height(&plane_state->uapi.dst);

                cntl = plane_state->ctl |
                        i9xx_cursor_ctl_crtc(crtc_state);

                if (width != height)
                        fbc_ctl = CUR_FBC_CTL_EN | (height - 1);

                base = intel_cursor_base(plane_state);
                pos = intel_cursor_position(plane_state);
        }

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        /*
         * On some platforms writing CURCNTR first will also
         * cause CURPOS to be armed by the CURBASE write.
         * Without the CURCNTR write the CURPOS write would
         * arm itself. Thus we always update CURCNTR before
         * CURPOS.
         *
         * On other platforms CURPOS always requires the
         * CURBASE write to arm the update. Additonally
         * a write to any of the cursor register will cancel
         * an already armed cursor update. Thus leaving out
         * the CURBASE write after CURPOS could lead to a
         * cursor that doesn't appear to move, or even change
         * shape. Thus we always write CURBASE.
         *
         * The other registers are armed by by the CURBASE write
         * except when the plane is getting enabled at which time
         * the CURCNTR write arms the update.
         */

        if (INTEL_GEN(dev_priv) >= 9)
                skl_write_cursor_wm(plane, crtc_state);

        if (plane->cursor.base != base ||
            plane->cursor.size != fbc_ctl ||
            plane->cursor.cntl != cntl) {
                if (HAS_CUR_FBC(dev_priv))
                        intel_de_write_fw(dev_priv, CUR_FBC_CTL(pipe),
                                          fbc_ctl);
                intel_de_write_fw(dev_priv, CURCNTR(pipe), cntl);
                intel_de_write_fw(dev_priv, CURPOS(pipe), pos);
                intel_de_write_fw(dev_priv, CURBASE(pipe), base);

                plane->cursor.base = base;
                plane->cursor.size = fbc_ctl;
                plane->cursor.cntl = cntl;
        } else {
                intel_de_write_fw(dev_priv, CURPOS(pipe), pos);
                intel_de_write_fw(dev_priv, CURBASE(pipe), base);
        }

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void i9xx_disable_cursor(struct intel_plane *plane,
                                const struct intel_crtc_state *crtc_state)
{
        i9xx_update_cursor(plane, crtc_state, NULL);
}

static bool i9xx_cursor_get_hw_state(struct intel_plane *plane,
                                     enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;
        bool ret;
        u32 val;

        /*
         * Not 100% correct for planes that can move between pipes,
         * but that's only the case for gen2-3 which don't have any
         * display power wells.
         */
        power_domain = POWER_DOMAIN_PIPE(plane->pipe);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        val = intel_de_read(dev_priv, CURCNTR(plane->pipe));

        ret = val & MCURSOR_MODE;

        if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                *pipe = plane->pipe;
        else
                *pipe = (val & MCURSOR_PIPE_SELECT_MASK) >>
                        MCURSOR_PIPE_SELECT_SHIFT;

        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

/* VESA 640x480x72Hz mode to set on the pipe */
static const struct drm_display_mode load_detect_mode = {
        DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
                 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};

struct drm_framebuffer *
intel_framebuffer_create(struct drm_i915_gem_object *obj,
                         struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct intel_framebuffer *intel_fb;
        int ret;

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb)
                return ERR_PTR(-ENOMEM);

        ret = intel_framebuffer_init(intel_fb, obj, mode_cmd);
        if (ret)
                goto err;

        return &intel_fb->base;

err:
        kfree(intel_fb);
        return ERR_PTR(ret);
}

static int intel_modeset_disable_planes(struct drm_atomic_state *state,
                                        struct drm_crtc *crtc)
{
        struct drm_plane *plane;
        struct drm_plane_state *plane_state;
        int ret, i;

        ret = drm_atomic_add_affected_planes(state, crtc);
        if (ret)
                return ret;

        for_each_new_plane_in_state(state, plane, plane_state, i) {
                if (plane_state->crtc != crtc)
                        continue;

                ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
                if (ret)
                        return ret;

                drm_atomic_set_fb_for_plane(plane_state, NULL);
        }

        return 0;
}

int intel_get_load_detect_pipe(struct drm_connector *connector,
                               struct intel_load_detect_pipe *old,
                               struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_crtc *intel_crtc;
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(to_intel_connector(connector));
        struct drm_crtc *possible_crtc;
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_crtc *crtc = NULL;
        struct drm_device *dev = encoder->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_mode_config *config = &dev->mode_config;
        struct drm_atomic_state *state = NULL, *restore_state = NULL;
        struct drm_connector_state *connector_state;
        struct intel_crtc_state *crtc_state;
        int ret, i = -1;

        drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                    connector->base.id, connector->name,
                    encoder->base.id, encoder->name);

        old->restore_state = NULL;

        drm_WARN_ON(dev, !drm_modeset_is_locked(&config->connection_mutex));

        /*
         * Algorithm gets a little messy:
         *
         *   - if the connector already has an assigned crtc, use it (but make
         *     sure it's on first)
         *
         *   - try to find the first unused crtc that can drive this connector,
         *     and use that if we find one
         */

        /* See if we already have a CRTC for this connector */
        if (connector->state->crtc) {
                crtc = connector->state->crtc;

                ret = drm_modeset_lock(&crtc->mutex, ctx);
                if (ret)
                        goto fail;

                /* Make sure the crtc and connector are running */
                goto found;
        }

        /* Find an unused one (if possible) */
        for_each_crtc(dev, possible_crtc) {
                i++;
                if (!(encoder->possible_crtcs & (1 << i)))
                        continue;

                ret = drm_modeset_lock(&possible_crtc->mutex, ctx);
                if (ret)
                        goto fail;

                if (possible_crtc->state->enable) {
                        drm_modeset_unlock(&possible_crtc->mutex);
                        continue;
                }

                crtc = possible_crtc;
                break;
        }

        /*
         * If we didn't find an unused CRTC, don't use any.
         */
        if (!crtc) {
                drm_dbg_kms(&dev_priv->drm,
                            "no pipe available for load-detect\n");
                ret = -ENODEV;
                goto fail;
        }

found:
        intel_crtc = to_intel_crtc(crtc);

        state = drm_atomic_state_alloc(dev);
        restore_state = drm_atomic_state_alloc(dev);
        if (!state || !restore_state) {
                ret = -ENOMEM;
                goto fail;
        }

        state->acquire_ctx = ctx;
        restore_state->acquire_ctx = ctx;

        connector_state = drm_atomic_get_connector_state(state, connector);
        if (IS_ERR(connector_state)) {
                ret = PTR_ERR(connector_state);
                goto fail;
        }

        ret = drm_atomic_set_crtc_for_connector(connector_state, crtc);
        if (ret)
                goto fail;

        crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
        if (IS_ERR(crtc_state)) {
                ret = PTR_ERR(crtc_state);
                goto fail;
        }

        crtc_state->uapi.active = true;

        ret = drm_atomic_set_mode_for_crtc(&crtc_state->uapi,
                                           &load_detect_mode);
        if (ret)
                goto fail;

        ret = intel_modeset_disable_planes(state, crtc);
        if (ret)
                goto fail;

        ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(restore_state, connector));
        if (!ret)
                ret = PTR_ERR_OR_ZERO(drm_atomic_get_crtc_state(restore_state, crtc));
        if (!ret)
                ret = drm_atomic_add_affected_planes(restore_state, crtc);
        if (ret) {
                drm_dbg_kms(&dev_priv->drm,
                            "Failed to create a copy of old state to restore: %i\n",
                            ret);
                goto fail;
        }

        ret = drm_atomic_commit(state);
        if (ret) {
                drm_dbg_kms(&dev_priv->drm,
                            "failed to set mode on load-detect pipe\n");
                goto fail;
        }

        old->restore_state = restore_state;
        drm_atomic_state_put(state);

        /* let the connector get through one full cycle before testing */
        intel_wait_for_vblank(dev_priv, intel_crtc->pipe);
        return true;

fail:
        if (state) {
                drm_atomic_state_put(state);
                state = NULL;
        }
        if (restore_state) {
                drm_atomic_state_put(restore_state);
                restore_state = NULL;
        }

        if (ret == -EDEADLK)
                return ret;

        return false;
}

void intel_release_load_detect_pipe(struct drm_connector *connector,
                                    struct intel_load_detect_pipe *old,
                                    struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(to_intel_connector(connector));
        struct drm_i915_private *i915 = to_i915(intel_encoder->base.dev);
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_atomic_state *state = old->restore_state;
        int ret;

        drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                    connector->base.id, connector->name,
                    encoder->base.id, encoder->name);

        if (!state)
                return;

        ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
        if (ret)
                drm_dbg_kms(&i915->drm,
                            "Couldn't release load detect pipe: %i\n", ret);
        drm_atomic_state_put(state);
}

static int i9xx_pll_refclk(struct drm_device *dev,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll = pipe_config->dpll_hw_state.dpll;

        if ((dpll & PLL_REF_INPUT_MASK) == PLLB_REF_INPUT_SPREADSPECTRUMIN)
                return dev_priv->vbt.lvds_ssc_freq;
        else if (HAS_PCH_SPLIT(dev_priv))
                return 120000;
        else if (!IS_GEN(dev_priv, 2))
                return 96000;
        else
                return 48000;
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        u32 dpll = pipe_config->dpll_hw_state.dpll;
        u32 fp;
        struct dpll clock;
        int port_clock;
        int refclk = i9xx_pll_refclk(dev, pipe_config);

        if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                fp = pipe_config->dpll_hw_state.fp0;
        else
                fp = pipe_config->dpll_hw_state.fp1;

        clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
        if (IS_PINEVIEW(dev_priv)) {
                clock.n = ffs((fp & FP_N_PINEVIEW_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
                clock.m2 = (fp & FP_M2_PINEVIEW_DIV_MASK) >> FP_M2_DIV_SHIFT;
        } else {
                clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
                clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
        }

        if (!IS_GEN(dev_priv, 2)) {
                if (IS_PINEVIEW(dev_priv))
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_PINEVIEW) >>
                                DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW);
                else
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK) >>
                               DPLL_FPA01_P1_POST_DIV_SHIFT);

                switch (dpll & DPLL_MODE_MASK) {
                case DPLLB_MODE_DAC_SERIAL:
                        clock.p2 = dpll & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ?
                                5 : 10;
                        break;
                case DPLLB_MODE_LVDS:
                        clock.p2 = dpll & DPLLB_LVDS_P2_CLOCK_DIV_7 ?
                                7 : 14;
                        break;
                default:
                        drm_dbg_kms(&dev_priv->drm,
                                    "Unknown DPLL mode %08x in programmed "
                                    "mode\n", (int)(dpll & DPLL_MODE_MASK));
                        return;
                }

                if (IS_PINEVIEW(dev_priv))
                        port_clock = pnv_calc_dpll_params(refclk, &clock);
                else
                        port_clock = i9xx_calc_dpll_params(refclk, &clock);
        } else {
                u32 lvds = IS_I830(dev_priv) ? 0 : intel_de_read(dev_priv,
                                                                 LVDS);
                bool is_lvds = (pipe == 1) && (lvds & LVDS_PORT_EN);

                if (is_lvds) {
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
                                       DPLL_FPA01_P1_POST_DIV_SHIFT);

                        if (lvds & LVDS_CLKB_POWER_UP)
                                clock.p2 = 7;
                        else
                                clock.p2 = 14;
                } else {
                        if (dpll & PLL_P1_DIVIDE_BY_TWO)
                                clock.p1 = 2;
                        else {
                                clock.p1 = ((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
                                            DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
                        }
                        if (dpll & PLL_P2_DIVIDE_BY_4)
                                clock.p2 = 4;
                        else
                                clock.p2 = 2;
                }

                port_clock = i9xx_calc_dpll_params(refclk, &clock);
        }

        /*
         * This value includes pixel_multiplier. We will use
         * port_clock to compute adjusted_mode.crtc_clock in the
         * encoder's get_config() function.
         */
        pipe_config->port_clock = port_clock;
}

int intel_dotclock_calculate(int link_freq,
                             const struct intel_link_m_n *m_n)
{
        /*
         * The calculation for the data clock is:
         * pixel_clock = ((m/n)*(link_clock * nr_lanes))/bpp
         * But we want to avoid losing precison if possible, so:
         * pixel_clock = ((m * link_clock * nr_lanes)/(n*bpp))
         *
         * and the link clock is simpler:
         * link_clock = (m * link_clock) / n
         */

        if (!m_n->link_n)
                return 0;

        return div_u64(mul_u32_u32(m_n->link_m, link_freq), m_n->link_n);
}

static void ilk_pch_clock_get(struct intel_crtc *crtc,
                              struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* read out port_clock from the DPLL */
        i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * In case there is an active pipe without active ports,
         * we may need some idea for the dotclock anyway.
         * Calculate one based on the FDI configuration.
         */
        pipe_config->hw.adjusted_mode.crtc_clock =
                intel_dotclock_calculate(intel_fdi_link_freq(dev_priv, pipe_config),
                                         &pipe_config->fdi_m_n);
}

static void intel_crtc_state_reset(struct intel_crtc_state *crtc_state,
                                   struct intel_crtc *crtc)
{
        memset(crtc_state, 0, sizeof(*crtc_state));

        __drm_atomic_helper_crtc_state_reset(&crtc_state->uapi, &crtc->base);

        crtc_state->cpu_transcoder = INVALID_TRANSCODER;
        crtc_state->master_transcoder = INVALID_TRANSCODER;
        crtc_state->hsw_workaround_pipe = INVALID_PIPE;
        crtc_state->output_format = INTEL_OUTPUT_FORMAT_INVALID;
        crtc_state->scaler_state.scaler_id = -1;
        crtc_state->mst_master_transcoder = INVALID_TRANSCODER;
}

static struct intel_crtc_state *intel_crtc_state_alloc(struct intel_crtc *crtc)
{
        struct intel_crtc_state *crtc_state;

        crtc_state = kmalloc(sizeof(*crtc_state), GFP_KERNEL);

        if (crtc_state)
                intel_crtc_state_reset(crtc_state, crtc);

        return crtc_state;
}

/* Returns the currently programmed mode of the given encoder. */
struct drm_display_mode *
intel_encoder_current_mode(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc_state *crtc_state;
        struct drm_display_mode *mode;
        struct intel_crtc *crtc;
        enum pipe pipe;

        if (!encoder->get_hw_state(encoder, &pipe))
                return NULL;

        crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        mode = kzalloc(sizeof(*mode), GFP_KERNEL);
        if (!mode)
                return NULL;

        crtc_state = intel_crtc_state_alloc(crtc);
        if (!crtc_state) {
                kfree(mode);
                return NULL;
        }

        if (!dev_priv->display.get_pipe_config(crtc, crtc_state)) {
                kfree(crtc_state);
                kfree(mode);
                return NULL;
        }

        encoder->get_config(encoder, crtc_state);

        intel_mode_from_pipe_config(mode, crtc_state);

        kfree(crtc_state);

        return mode;
}

static void intel_crtc_destroy(struct drm_crtc *crtc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        drm_crtc_cleanup(crtc);
        kfree(intel_crtc);
}

/**
 * intel_wm_need_update - Check whether watermarks need updating
 * @cur: current plane state
 * @new: new plane state
 *
 * Check current plane state versus the new one to determine whether
 * watermarks need to be recalculated.
 *
 * Returns true or false.
 */
static bool intel_wm_need_update(const struct intel_plane_state *cur,
                                 struct intel_plane_state *new)
{
        /* Update watermarks on tiling or size changes. */
        if (new->uapi.visible != cur->uapi.visible)
                return true;

        if (!cur->hw.fb || !new->hw.fb)
                return false;

        if (cur->hw.fb->modifier != new->hw.fb->modifier ||
            cur->hw.rotation != new->hw.rotation ||
            drm_rect_width(&new->uapi.src) != drm_rect_width(&cur->uapi.src) ||
            drm_rect_height(&new->uapi.src) != drm_rect_height(&cur->uapi.src) ||
            drm_rect_width(&new->uapi.dst) != drm_rect_width(&cur->uapi.dst) ||
            drm_rect_height(&new->uapi.dst) != drm_rect_height(&cur->uapi.dst))
                return true;

        return false;
}

static bool needs_scaling(const struct intel_plane_state *state)
{
        int src_w = drm_rect_width(&state->uapi.src) >> 16;
        int src_h = drm_rect_height(&state->uapi.src) >> 16;
        int dst_w = drm_rect_width(&state->uapi.dst);
        int dst_h = drm_rect_height(&state->uapi.dst);

        return (src_w != dst_w || src_h != dst_h);
}

int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_state,
                                    struct intel_crtc_state *crtc_state,
                                    const struct intel_plane_state *old_plane_state,
                                    struct intel_plane_state *plane_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        bool mode_changed = needs_modeset(crtc_state);
        bool was_crtc_enabled = old_crtc_state->hw.active;
        bool is_crtc_enabled = crtc_state->hw.active;
        bool turn_off, turn_on, visible, was_visible;
        int ret;

        if (INTEL_GEN(dev_priv) >= 9 && plane->id != PLANE_CURSOR) {
                ret = skl_update_scaler_plane(crtc_state, plane_state);
                if (ret)
                        return ret;
        }

        was_visible = old_plane_state->uapi.visible;
        visible = plane_state->uapi.visible;

        if (!was_crtc_enabled && drm_WARN_ON(&dev_priv->drm, was_visible))
                was_visible = false;

        /*
         * Visibility is calculated as if the crtc was on, but
         * after scaler setup everything depends on it being off
         * when the crtc isn't active.
         *
         * FIXME this is wrong for watermarks. Watermarks should also
         * be computed as if the pipe would be active. Perhaps move
         * per-plane wm computation to the .check_plane() hook, and
         * only combine the results from all planes in the current place?
         */
        if (!is_crtc_enabled) {
                intel_plane_set_invisible(crtc_state, plane_state);
                visible = false;
        }

        if (!was_visible && !visible)
                return 0;

        turn_off = was_visible && (!visible || mode_changed);
        turn_on = visible && (!was_visible || mode_changed);

        drm_dbg_atomic(&dev_priv->drm,
                       "[CRTC:%d:%s] with [PLANE:%d:%s] visible %i -> %i, off %i, on %i, ms %i\n",
                       crtc->base.base.id, crtc->base.name,
                       plane->base.base.id, plane->base.name,
                       was_visible, visible,
                       turn_off, turn_on, mode_changed);

        if (turn_on) {
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
                        crtc_state->update_wm_pre = true;

                /* must disable cxsr around plane enable/disable */
                if (plane->id != PLANE_CURSOR)
                        crtc_state->disable_cxsr = true;
        } else if (turn_off) {
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
                        crtc_state->update_wm_post = true;

                /* must disable cxsr around plane enable/disable */
                if (plane->id != PLANE_CURSOR)
                        crtc_state->disable_cxsr = true;
        } else if (intel_wm_need_update(old_plane_state, plane_state)) {
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv)) {
                        /* FIXME bollocks */
                        crtc_state->update_wm_pre = true;
                        crtc_state->update_wm_post = true;
                }
        }

        if (visible || was_visible)
                crtc_state->fb_bits |= plane->frontbuffer_bit;

        /*
         * ILK/SNB DVSACNTR/Sprite Enable
         * IVB SPR_CTL/Sprite Enable
         * "When in Self Refresh Big FIFO mode, a write to enable the
         *  plane will be internally buffered and delayed while Big FIFO
         *  mode is exiting."
         *
         * Which means that enabling the sprite can take an extra frame
         * when we start in big FIFO mode (LP1+). Thus we need to drop
         * down to LP0 and wait for vblank in order to make sure the
         * sprite gets enabled on the next vblank after the register write.
         * Doing otherwise would risk enabling the sprite one frame after
         * we've already signalled flip completion. We can resume LP1+
         * once the sprite has been enabled.
         *
         *
         * WaCxSRDisabledForSpriteScaling:ivb
         * IVB SPR_SCALE/Scaling Enable
         * "Low Power watermarks must be disabled for at least one
         *  frame before enabling sprite scaling, and kept disabled
         *  until sprite scaling is disabled."
         *
         * ILK/SNB DVSASCALE/Scaling Enable
         * "When in Self Refresh Big FIFO mode, scaling enable will be
         *  masked off while Big FIFO mode is exiting."
         *
         * Despite the w/a only being listed for IVB we assume that
         * the ILK/SNB note has similar ramifications, hence we apply
         * the w/a on all three platforms.
         *
         * With experimental results seems this is needed also for primary
         * plane, not only sprite plane.
         */
        if (plane->id != PLANE_CURSOR &&
            (IS_GEN_RANGE(dev_priv, 5, 6) ||
             IS_IVYBRIDGE(dev_priv)) &&
            (turn_on || (!needs_scaling(old_plane_state) &&
                         needs_scaling(plane_state))))
                crtc_state->disable_lp_wm = true;

        return 0;
}

static bool encoders_cloneable(const struct intel_encoder *a,
                               const struct intel_encoder *b)
{
        /* masks could be asymmetric, so check both ways */
        return a == b || (a->cloneable & (1 << b->type) &&
                          b->cloneable & (1 << a->type));
}

static bool check_single_encoder_cloning(struct drm_atomic_state *state,
                                         struct intel_crtc *crtc,
                                         struct intel_encoder *encoder)
{
        struct intel_encoder *source_encoder;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int i;

        for_each_new_connector_in_state(state, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                source_encoder =
                        to_intel_encoder(connector_state->best_encoder);
                if (!encoders_cloneable(encoder, source_encoder))
                        return false;
        }

        return true;
}

static int icl_add_linked_planes(struct intel_atomic_state *state)
{
        struct intel_plane *plane, *linked;
        struct intel_plane_state *plane_state, *linked_plane_state;
        int i;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                linked = plane_state->planar_linked_plane;

                if (!linked)
                        continue;

                linked_plane_state = intel_atomic_get_plane_state(state, linked);
                if (IS_ERR(linked_plane_state))
                        return PTR_ERR(linked_plane_state);

                drm_WARN_ON(state->base.dev,
                            linked_plane_state->planar_linked_plane != plane);
                drm_WARN_ON(state->base.dev,
                            linked_plane_state->planar_slave == plane_state->planar_slave);
        }

        return 0;
}

static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_atomic_state *state = to_intel_atomic_state(crtc_state->uapi.state);
        struct intel_plane *plane, *linked;
        struct intel_plane_state *plane_state;
        int i;

        if (INTEL_GEN(dev_priv) < 11)
                return 0;

        /*
         * Destroy all old plane links and make the slave plane invisible
         * in the crtc_state->active_planes mask.
         */
        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->pipe != crtc->pipe || !plane_state->planar_linked_plane)
                        continue;

                plane_state->planar_linked_plane = NULL;
                if (plane_state->planar_slave && !plane_state->uapi.visible) {
                        crtc_state->active_planes &= ~BIT(plane->id);
                        crtc_state->update_planes |= BIT(plane->id);
                }

                plane_state->planar_slave = false;
        }

        if (!crtc_state->nv12_planes)
                return 0;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                struct intel_plane_state *linked_state = NULL;

                if (plane->pipe != crtc->pipe ||
                    !(crtc_state->nv12_planes & BIT(plane->id)))
                        continue;

                for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, linked) {
                        if (!icl_is_nv12_y_plane(dev_priv, linked->id))
                                continue;

                        if (crtc_state->active_planes & BIT(linked->id))
                                continue;

                        linked_state = intel_atomic_get_plane_state(state, linked);
                        if (IS_ERR(linked_state))
                                return PTR_ERR(linked_state);

                        break;
                }

                if (!linked_state) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Need %d free Y planes for planar YUV\n",
                                    hweight8(crtc_state->nv12_planes));

                        return -EINVAL;
                }

                plane_state->planar_linked_plane = linked;

                linked_state->planar_slave = true;
                linked_state->planar_linked_plane = plane;
                crtc_state->active_planes |= BIT(linked->id);
                crtc_state->update_planes |= BIT(linked->id);
                drm_dbg_kms(&dev_priv->drm, "Using %s as Y plane for %s\n",
                            linked->base.name, plane->base.name);

                /* Copy parameters to slave plane */
                linked_state->ctl = plane_state->ctl | PLANE_CTL_YUV420_Y_PLANE;
                linked_state->color_ctl = plane_state->color_ctl;
                linked_state->view = plane_state->view;
                memcpy(linked_state->color_plane, plane_state->color_plane,
                       sizeof(linked_state->color_plane));

                intel_plane_copy_uapi_to_hw_state(linked_state, plane_state);
                linked_state->uapi.src = plane_state->uapi.src;
                linked_state->uapi.dst = plane_state->uapi.dst;

                if (icl_is_hdr_plane(dev_priv, plane->id)) {
                        if (linked->id == PLANE_SPRITE5)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_7;
                        else if (linked->id == PLANE_SPRITE4)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_6;
                        else if (linked->id == PLANE_SPRITE3)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_5_RKL;
                        else if (linked->id == PLANE_SPRITE2)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_4_RKL;
                        else
                                MISSING_CASE(linked->id);
                }
        }

        return 0;
}

static bool c8_planes_changed(const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct intel_atomic_state *state =
                to_intel_atomic_state(new_crtc_state->uapi.state);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);

        return !old_crtc_state->c8_planes != !new_crtc_state->c8_planes;
}

static u16 hsw_linetime_wm(const struct intel_crtc_state *crtc_state)
{
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;
        int linetime_wm;

        if (!crtc_state->hw.enable)
                return 0;

        linetime_wm = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
                                        adjusted_mode->crtc_clock);

        return min(linetime_wm, 0x1ff);
}

static u16 hsw_ips_linetime_wm(const struct intel_crtc_state *crtc_state,
                               const struct intel_cdclk_state *cdclk_state)
{
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;
        int linetime_wm;

        if (!crtc_state->hw.enable)
                return 0;

        linetime_wm = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
                                        cdclk_state->logical.cdclk);

        return min(linetime_wm, 0x1ff);
}

static u16 skl_linetime_wm(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;
        int linetime_wm;

        if (!crtc_state->hw.enable)
                return 0;

        linetime_wm = DIV_ROUND_UP(adjusted_mode->crtc_htotal * 1000 * 8,
                                   crtc_state->pixel_rate);

        /* Display WA #1135: BXT:ALL GLK:ALL */
        if (IS_GEN9_LP(dev_priv) && dev_priv->ipc_enabled)
                linetime_wm /= 2;

        return min(linetime_wm, 0x1ff);
}

static int hsw_compute_linetime_wm(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct intel_cdclk_state *cdclk_state;

        if (INTEL_GEN(dev_priv) >= 9)
                crtc_state->linetime = skl_linetime_wm(crtc_state);
        else
                crtc_state->linetime = hsw_linetime_wm(crtc_state);

        if (!hsw_crtc_supports_ips(crtc))
                return 0;

        cdclk_state = intel_atomic_get_cdclk_state(state);
        if (IS_ERR(cdclk_state))
                return PTR_ERR(cdclk_state);

        crtc_state->ips_linetime = hsw_ips_linetime_wm(crtc_state,
                                                       cdclk_state);

        return 0;
}

static int intel_crtc_atomic_check(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        bool mode_changed = needs_modeset(crtc_state);
        int ret;

        if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv) &&
            mode_changed && !crtc_state->hw.active)
                crtc_state->update_wm_post = true;

        if (mode_changed && crtc_state->hw.enable &&
            dev_priv->display.crtc_compute_clock &&
            !drm_WARN_ON(&dev_priv->drm, crtc_state->shared_dpll)) {
                ret = dev_priv->display.crtc_compute_clock(crtc, crtc_state);
                if (ret)
                        return ret;
        }

        /*
         * May need to update pipe gamma enable bits
         * when C8 planes are getting enabled/disabled.
         */
        if (c8_planes_changed(crtc_state))
                crtc_state->uapi.color_mgmt_changed = true;

        if (mode_changed || crtc_state->update_pipe ||
            crtc_state->uapi.color_mgmt_changed) {
                ret = intel_color_check(crtc_state);
                if (ret)
                        return ret;
        }

        if (dev_priv->display.compute_pipe_wm) {
                ret = dev_priv->display.compute_pipe_wm(crtc_state);
                if (ret) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Target pipe watermarks are invalid\n");
                        return ret;
                }
        }

        if (dev_priv->display.compute_intermediate_wm) {
                if (drm_WARN_ON(&dev_priv->drm,
                                !dev_priv->display.compute_pipe_wm))
                        return 0;

                /*
                 * Calculate 'intermediate' watermarks that satisfy both the
                 * old state and the new state.  We can program these
                 * immediately.
                 */
                ret = dev_priv->display.compute_intermediate_wm(crtc_state);
                if (ret) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "No valid intermediate pipe watermarks are possible\n");
                        return ret;
                }
        }

        if (INTEL_GEN(dev_priv) >= 9) {
                if (mode_changed || crtc_state->update_pipe) {
                        ret = skl_update_scaler_crtc(crtc_state);
                        if (ret)
                                return ret;
                }

                ret = intel_atomic_setup_scalers(dev_priv, crtc, crtc_state);
                if (ret)
                        return ret;
        }

        if (HAS_IPS(dev_priv)) {
                ret = hsw_compute_ips_config(crtc_state);
                if (ret)
                        return ret;
        }

        if (INTEL_GEN(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                ret = hsw_compute_linetime_wm(state, crtc);
                if (ret)
                        return ret;

        }

        return 0;
}

static void intel_modeset_update_connector_atomic_state(struct drm_device *dev)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;

        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->base.state->crtc)
                        drm_connector_put(&connector->base);

                if (connector->base.encoder) {
                        connector->base.state->best_encoder =
                                connector->base.encoder;
                        connector->base.state->crtc =
                                connector->base.encoder->crtc;

                        drm_connector_get(&connector->base);
                } else {
                        connector->base.state->best_encoder = NULL;
                        connector->base.state->crtc = NULL;
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}

static int
compute_sink_pipe_bpp(const struct drm_connector_state *conn_state,
                      struct intel_crtc_state *pipe_config)
{
        struct drm_connector *connector = conn_state->connector;
        struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);
        const struct drm_display_info *info = &connector->display_info;
        int bpp;

        switch (conn_state->max_bpc) {
        case 6 ... 7:
                bpp = 6 * 3;
                break;
        case 8 ... 9:
                bpp = 8 * 3;
                break;
        case 10 ... 11:
                bpp = 10 * 3;
                break;
        case 12:
                bpp = 12 * 3;
                break;
        default:
                return -EINVAL;
        }

        if (bpp < pipe_config->pipe_bpp) {
                drm_dbg_kms(&i915->drm,
                            "[CONNECTOR:%d:%s] Limiting display bpp to %d instead of "
                            "EDID bpp %d, requested bpp %d, max platform bpp %d\n",
                            connector->base.id, connector->name,
                            bpp, 3 * info->bpc,
                            3 * conn_state->max_requested_bpc,
                            pipe_config->pipe_bpp);

                pipe_config->pipe_bpp = bpp;
        }

        return 0;
}

static int
compute_baseline_pipe_bpp(struct intel_crtc *crtc,
                          struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_atomic_state *state = pipe_config->uapi.state;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int bpp, i;

        if ((IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)))
                bpp = 10*3;
        else if (INTEL_GEN(dev_priv) >= 5)
                bpp = 12*3;
        else
                bpp = 8*3;

        pipe_config->pipe_bpp = bpp;

        /* Clamp display bpp to connector max bpp */
        for_each_new_connector_in_state(state, connector, connector_state, i) {
                int ret;

                if (connector_state->crtc != &crtc->base)
                        continue;

                ret = compute_sink_pipe_bpp(connector_state, pipe_config);
                if (ret)
                        return ret;
        }

        return 0;
}

static void intel_dump_crtc_timings(struct drm_i915_private *i915,
                                    const struct drm_display_mode *mode)
{
        drm_dbg_kms(&i915->drm, "crtc timings: %d %d %d %d %d %d %d %d %d, "
                    "type: 0x%x flags: 0x%x\n",
                    mode->crtc_clock,
                    mode->crtc_hdisplay, mode->crtc_hsync_start,
                    mode->crtc_hsync_end, mode->crtc_htotal,
                    mode->crtc_vdisplay, mode->crtc_vsync_start,
                    mode->crtc_vsync_end, mode->crtc_vtotal,
                    mode->type, mode->flags);
}

static void
intel_dump_m_n_config(const struct intel_crtc_state *pipe_config,
                      const char *id, unsigned int lane_count,
                      const struct intel_link_m_n *m_n)
{
        struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);

        drm_dbg_kms(&i915->drm,
                    "%s: lanes: %i; gmch_m: %u, gmch_n: %u, link_m: %u, link_n: %u, tu: %u\n",
                    id, lane_count,
                    m_n->gmch_m, m_n->gmch_n,
                    m_n->link_m, m_n->link_n, m_n->tu);
}

static void
intel_dump_infoframe(struct drm_i915_private *dev_priv,
                     const union hdmi_infoframe *frame)
{
        if (!drm_debug_enabled(DRM_UT_KMS))
                return;

        hdmi_infoframe_log(KERN_DEBUG, dev_priv->drm.dev, frame);
}

static void
intel_dump_dp_vsc_sdp(struct drm_i915_private *dev_priv,
                      const struct drm_dp_vsc_sdp *vsc)
{
        if (!drm_debug_enabled(DRM_UT_KMS))
                return;

        drm_dp_vsc_sdp_log(KERN_DEBUG, dev_priv->drm.dev, vsc);
}

#define OUTPUT_TYPE(x) [INTEL_OUTPUT_ ## x] = #x

static const char * const output_type_str[] = {
        OUTPUT_TYPE(UNUSED),
        OUTPUT_TYPE(ANALOG),
        OUTPUT_TYPE(DVO),
        OUTPUT_TYPE(SDVO),
        OUTPUT_TYPE(LVDS),
        OUTPUT_TYPE(TVOUT),
        OUTPUT_TYPE(HDMI),
        OUTPUT_TYPE(DP),
        OUTPUT_TYPE(EDP),
        OUTPUT_TYPE(DSI),
        OUTPUT_TYPE(DDI),
        OUTPUT_TYPE(DP_MST),
};

#undef OUTPUT_TYPE

static void snprintf_output_types(char *buf, size_t len,
                                  unsigned int output_types)
{
        char *str = buf;
        int i;

        str[0] = '\0';

        for (i = 0; i < ARRAY_SIZE(output_type_str); i++) {
                int r;

                if ((output_types & BIT(i)) == 0)
                        continue;

                r = snprintf(str, len, "%s%s",
                             str != buf ? "," : "", output_type_str[i]);
                if (r >= len)
                        break;
                str += r;
                len -= r;

                output_types &= ~BIT(i);
        }

        WARN_ON_ONCE(output_types != 0);
}

static const char * const output_format_str[] = {
        [INTEL_OUTPUT_FORMAT_INVALID] = "Invalid",
        [INTEL_OUTPUT_FORMAT_RGB] = "RGB",
        [INTEL_OUTPUT_FORMAT_YCBCR420] = "YCBCR4:2:0",
        [INTEL_OUTPUT_FORMAT_YCBCR444] = "YCBCR4:4:4",
};

static const char *output_formats(enum intel_output_format format)
{
        if (format >= ARRAY_SIZE(output_format_str))
                format = INTEL_OUTPUT_FORMAT_INVALID;
        return output_format_str[format];
}

static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *i915 = to_i915(plane->base.dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;
        struct drm_format_name_buf format_name;

        if (!fb) {
                drm_dbg_kms(&i915->drm,
                            "[PLANE:%d:%s] fb: [NOFB], visible: %s\n",
                            plane->base.base.id, plane->base.name,
                            yesno(plane_state->uapi.visible));
                return;
        }

        drm_dbg_kms(&i915->drm,
                    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %s, visible: %s\n",
                    plane->base.base.id, plane->base.name,
                    fb->base.id, fb->width, fb->height,
                    drm_get_format_name(fb->format->format, &format_name),
                    yesno(plane_state->uapi.visible));
        drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
                    plane_state->hw.rotation, plane_state->scaler_id);
        if (plane_state->uapi.visible)
                drm_dbg_kms(&i915->drm,
                            "\tsrc: " DRM_RECT_FP_FMT " dst: " DRM_RECT_FMT "\n",
                            DRM_RECT_FP_ARG(&plane_state->uapi.src),
                            DRM_RECT_ARG(&plane_state->uapi.dst));
}

static void intel_dump_pipe_config(const struct intel_crtc_state *pipe_config,
                                   struct intel_atomic_state *state,
                                   const char *context)
{
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        char buf[64];
        int i;

        drm_dbg_kms(&dev_priv->drm, "[CRTC:%d:%s] enable: %s %s\n",
                    crtc->base.base.id, crtc->base.name,
                    yesno(pipe_config->hw.enable), context);

        if (!pipe_config->hw.enable)
                goto dump_planes;

        snprintf_output_types(buf, sizeof(buf), pipe_config->output_types);
        drm_dbg_kms(&dev_priv->drm,
                    "active: %s, output_types: %s (0x%x), output format: %s\n",
                    yesno(pipe_config->hw.active),
                    buf, pipe_config->output_types,
                    output_formats(pipe_config->output_format));

        drm_dbg_kms(&dev_priv->drm,
                    "cpu_transcoder: %s, pipe bpp: %i, dithering: %i\n",
                    transcoder_name(pipe_config->cpu_transcoder),
                    pipe_config->pipe_bpp, pipe_config->dither);

        drm_dbg_kms(&dev_priv->drm,
                    "port sync: master transcoder: %s, slave transcoder bitmask = 0x%x\n",
                    transcoder_name(pipe_config->master_transcoder),
                    pipe_config->sync_mode_slaves_mask);

        if (pipe_config->has_pch_encoder)
                intel_dump_m_n_config(pipe_config, "fdi",
                                      pipe_config->fdi_lanes,
                                      &pipe_config->fdi_m_n);

        if (intel_crtc_has_dp_encoder(pipe_config)) {
                intel_dump_m_n_config(pipe_config, "dp m_n",
                                pipe_config->lane_count, &pipe_config->dp_m_n);
                if (pipe_config->has_drrs)
                        intel_dump_m_n_config(pipe_config, "dp m2_n2",
                                              pipe_config->lane_count,
                                              &pipe_config->dp_m2_n2);
        }

        drm_dbg_kms(&dev_priv->drm,
                    "audio: %i, infoframes: %i, infoframes enabled: 0x%x\n",
                    pipe_config->has_audio, pipe_config->has_infoframe,
                    pipe_config->infoframes.enable);

        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GENERAL_CONTROL))
                drm_dbg_kms(&dev_priv->drm, "GCP: 0x%x\n",
                            pipe_config->infoframes.gcp);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_AVI))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.avi);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_SPD))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.spd);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_VENDOR))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.hdmi);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_DRM))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.drm);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.drm);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(DP_SDP_VSC))
                intel_dump_dp_vsc_sdp(dev_priv, &pipe_config->infoframes.vsc);

        drm_dbg_kms(&dev_priv->drm, "requested mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->hw.mode);
        drm_dbg_kms(&dev_priv->drm, "adjusted mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->hw.adjusted_mode);
        intel_dump_crtc_timings(dev_priv, &pipe_config->hw.adjusted_mode);
        drm_dbg_kms(&dev_priv->drm,
                    "port clock: %d, pipe src size: %dx%d, pixel rate %d\n",
                    pipe_config->port_clock,
                    pipe_config->pipe_src_w, pipe_config->pipe_src_h,
                    pipe_config->pixel_rate);

        drm_dbg_kms(&dev_priv->drm, "linetime: %d, ips linetime: %d\n",
                    pipe_config->linetime, pipe_config->ips_linetime);

        if (INTEL_GEN(dev_priv) >= 9)
                drm_dbg_kms(&dev_priv->drm,
                            "num_scalers: %d, scaler_users: 0x%x, scaler_id: %d\n",
                            crtc->num_scalers,
                            pipe_config->scaler_state.scaler_users,
                            pipe_config->scaler_state.scaler_id);

        if (HAS_GMCH(dev_priv))
                drm_dbg_kms(&dev_priv->drm,
                            "gmch pfit: control: 0x%08x, ratios: 0x%08x, lvds border: 0x%08x\n",
                            pipe_config->gmch_pfit.control,
                            pipe_config->gmch_pfit.pgm_ratios,
                            pipe_config->gmch_pfit.lvds_border_bits);
        else
                drm_dbg_kms(&dev_priv->drm,
                            "pch pfit: " DRM_RECT_FMT ", %s, force thru: %s\n",
                            DRM_RECT_ARG(&pipe_config->pch_pfit.dst),
                            enableddisabled(pipe_config->pch_pfit.enabled),
                            yesno(pipe_config->pch_pfit.force_thru));

        drm_dbg_kms(&dev_priv->drm, "ips: %i, double wide: %i\n",
                    pipe_config->ips_enabled, pipe_config->double_wide);

        intel_dpll_dump_hw_state(dev_priv, &pipe_config->dpll_hw_state);

        if (IS_CHERRYVIEW(dev_priv))
                drm_dbg_kms(&dev_priv->drm,
                            "cgm_mode: 0x%x gamma_mode: 0x%x gamma_enable: %d csc_enable: %d\n",
                            pipe_config->cgm_mode, pipe_config->gamma_mode,
                            pipe_config->gamma_enable, pipe_config->csc_enable);
        else
                drm_dbg_kms(&dev_priv->drm,
                            "csc_mode: 0x%x gamma_mode: 0x%x gamma_enable: %d csc_enable: %d\n",
                            pipe_config->csc_mode, pipe_config->gamma_mode,
                            pipe_config->gamma_enable, pipe_config->csc_enable);

        drm_dbg_kms(&dev_priv->drm, "MST master transcoder: %s\n",
                    transcoder_name(pipe_config->mst_master_transcoder));

dump_planes:
        if (!state)
                return;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->pipe == crtc->pipe)
                        intel_dump_plane_state(plane_state);
        }
}

static bool check_digital_port_conflicts(struct intel_atomic_state *state)
{
        struct drm_device *dev = state->base.dev;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        unsigned int used_ports = 0;
        unsigned int used_mst_ports = 0;
        bool ret = true;

        /*
         * We're going to peek into connector->state,
         * hence connection_mutex must be held.
         */
        drm_modeset_lock_assert_held(&dev->mode_config.connection_mutex);

        /*
         * Walk the connector list instead of the encoder
         * list to detect the problem on ddi platforms
         * where there's just one encoder per digital port.
         */
        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                struct drm_connector_state *connector_state;
                struct intel_encoder *encoder;

                connector_state =
                        drm_atomic_get_new_connector_state(&state->base,
                                                           connector);
                if (!connector_state)
                        connector_state = connector->state;

                if (!connector_state->best_encoder)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);

                drm_WARN_ON(dev, !connector_state->crtc);

                switch (encoder->type) {
                case INTEL_OUTPUT_DDI:
                        if (drm_WARN_ON(dev, !HAS_DDI(to_i915(dev))))
                                break;
                        /* else, fall through */
                case INTEL_OUTPUT_DP:
                case INTEL_OUTPUT_HDMI:
                case INTEL_OUTPUT_EDP:
                        /* the same port mustn't appear more than once */
                        if (used_ports & BIT(encoder->port))
                                ret = false;

                        used_ports |= BIT(encoder->port);
                        break;
                case INTEL_OUTPUT_DP_MST:
                        used_mst_ports |=
                                1 << encoder->port;
                        break;
                default:
                        break;
                }
        }
        drm_connector_list_iter_end(&conn_iter);

        /* can't mix MST and SST/HDMI on the same port */
        if (used_ports & used_mst_ports)
                return false;

        return ret;
}

static void
intel_crtc_copy_uapi_to_hw_state_nomodeset(struct intel_crtc_state *crtc_state)
{
        intel_crtc_copy_color_blobs(crtc_state);
}

static void
intel_crtc_copy_uapi_to_hw_state(struct intel_crtc_state *crtc_state)
{
        crtc_state->hw.enable = crtc_state->uapi.enable;
        crtc_state->hw.active = crtc_state->uapi.active;
        crtc_state->hw.mode = crtc_state->uapi.mode;
        crtc_state->hw.adjusted_mode = crtc_state->uapi.adjusted_mode;
        intel_crtc_copy_uapi_to_hw_state_nomodeset(crtc_state);
}

static void intel_crtc_copy_hw_to_uapi_state(struct intel_crtc_state *crtc_state)
{
        crtc_state->uapi.enable = crtc_state->hw.enable;
        crtc_state->uapi.active = crtc_state->hw.active;
        drm_WARN_ON(crtc_state->uapi.crtc->dev,
                    drm_atomic_set_mode_for_crtc(&crtc_state->uapi, &crtc_state->hw.mode) < 0);

        crtc_state->uapi.adjusted_mode = crtc_state->hw.adjusted_mode;

        /* copy color blobs to uapi */
        drm_property_replace_blob(&crtc_state->uapi.degamma_lut,
                                  crtc_state->hw.degamma_lut);
        drm_property_replace_blob(&crtc_state->uapi.gamma_lut,
                                  crtc_state->hw.gamma_lut);
        drm_property_replace_blob(&crtc_state->uapi.ctm,
                                  crtc_state->hw.ctm);
}

static int
intel_crtc_prepare_cleared_state(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *saved_state;

        saved_state = intel_crtc_state_alloc(crtc);
        if (!saved_state)
                return -ENOMEM;

        /* free the old crtc_state->hw members */
        intel_crtc_free_hw_state(crtc_state);

        /* FIXME: before the switch to atomic started, a new pipe_config was
         * kzalloc'd. Code that depends on any field being zero should be
         * fixed, so that the crtc_state can be safely duplicated. For now,
         * only fields that are know to not cause problems are preserved. */

        saved_state->uapi = crtc_state->uapi;
        saved_state->scaler_state = crtc_state->scaler_state;
        saved_state->shared_dpll = crtc_state->shared_dpll;
        saved_state->dpll_hw_state = crtc_state->dpll_hw_state;
        memcpy(saved_state->icl_port_dplls, crtc_state->icl_port_dplls,
               sizeof(saved_state->icl_port_dplls));
        saved_state->crc_enabled = crtc_state->crc_enabled;
        if (IS_G4X(dev_priv) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                saved_state->wm = crtc_state->wm;

        memcpy(crtc_state, saved_state, sizeof(*crtc_state));
        kfree(saved_state);

        intel_crtc_copy_uapi_to_hw_state(crtc_state);

        return 0;
}

static int
intel_modeset_pipe_config(struct intel_crtc_state *pipe_config)
{
        struct drm_crtc *crtc = pipe_config->uapi.crtc;
        struct drm_atomic_state *state = pipe_config->uapi.state;
        struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int base_bpp, ret, i;
        bool retry = true;

        pipe_config->cpu_transcoder =
                (enum transcoder) to_intel_crtc(crtc)->pipe;

        /*
         * Sanitize sync polarity flags based on requested ones. If neither
         * positive or negative polarity is requested, treat this as meaning
         * negative polarity.
         */
        if (!(pipe_config->hw.adjusted_mode.flags &
              (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
                pipe_config->hw.adjusted_mode.flags |= DRM_MODE_FLAG_NHSYNC;

        if (!(pipe_config->hw.adjusted_mode.flags &
              (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
                pipe_config->hw.adjusted_mode.flags |= DRM_MODE_FLAG_NVSYNC;

        ret = compute_baseline_pipe_bpp(to_intel_crtc(crtc),
                                        pipe_config);
        if (ret)
                return ret;

        base_bpp = pipe_config->pipe_bpp;

        /*
         * Determine the real pipe dimensions. Note that stereo modes can
         * increase the actual pipe size due to the frame doubling and
         * insertion of additional space for blanks between the frame. This
         * is stored in the crtc timings. We use the requested mode to do this
         * computation to clearly distinguish it from the adjusted mode, which
         * can be changed by the connectors in the below retry loop.
         */
        drm_mode_get_hv_timing(&pipe_config->hw.mode,
                               &pipe_config->pipe_src_w,
                               &pipe_config->pipe_src_h);

        for_each_new_connector_in_state(state, connector, connector_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(connector_state->best_encoder);

                if (connector_state->crtc != crtc)
                        continue;

                if (!check_single_encoder_cloning(state, to_intel_crtc(crtc), encoder)) {
                        drm_dbg_kms(&i915->drm,
                                    "rejecting invalid cloning configuration\n");
                        return -EINVAL;
                }

                /*
                 * Determine output_types before calling the .compute_config()
                 * hooks so that the hooks can use this information safely.
                 */
                if (encoder->compute_output_type)
                        pipe_config->output_types |=
                                BIT(encoder->compute_output_type(encoder, pipe_config,
                                                                 connector_state));
                else
                        pipe_config->output_types |= BIT(encoder->type);
        }

encoder_retry:
        /* Ensure the port clock defaults are reset when retrying. */
        pipe_config->port_clock = 0;
        pipe_config->pixel_multiplier = 1;

        /* Fill in default crtc timings, allow encoders to overwrite them. */
        drm_mode_set_crtcinfo(&pipe_config->hw.adjusted_mode,
                              CRTC_STEREO_DOUBLE);

        /* Pass our mode to the connectors and the CRTC to give them a chance to
         * adjust it according to limitations or connector properties, and also
         * a chance to reject the mode entirely.
         */
        for_each_new_connector_in_state(state, connector, connector_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(connector_state->best_encoder);

                if (connector_state->crtc != crtc)
                        continue;

                ret = encoder->compute_config(encoder, pipe_config,
                                              connector_state);
                if (ret < 0) {
                        if (ret != -EDEADLK)
                                drm_dbg_kms(&i915->drm,
                                            "Encoder config failure: %d\n",
                                            ret);
                        return ret;
                }
        }

        /* Set default port clock if not overwritten by the encoder. Needs to be
         * done afterwards in case the encoder adjusts the mode. */
        if (!pipe_config->port_clock)
                pipe_config->port_clock = pipe_config->hw.adjusted_mode.crtc_clock
                        * pipe_config->pixel_multiplier;

        ret = intel_crtc_compute_config(to_intel_crtc(crtc), pipe_config);
        if (ret == -EDEADLK)
                return ret;
        if (ret < 0) {
                drm_dbg_kms(&i915->drm, "CRTC fixup failed\n");
                return ret;
        }

        if (ret == RETRY) {
                if (drm_WARN(&i915->drm, !retry,
                             "loop in pipe configuration computation\n"))
                        return -EINVAL;

                drm_dbg_kms(&i915->drm, "CRTC bw constrained, retrying\n");
                retry = false;
                goto encoder_retry;
        }

        /* Dithering seems to not pass-through bits correctly when it should, so
         * only enable it on 6bpc panels and when its not a compliance
         * test requesting 6bpc video pattern.
         */
        pipe_config->dither = (pipe_config->pipe_bpp == 6*3) &&
                !pipe_config->dither_force_disable;
        drm_dbg_kms(&i915->drm,
                    "hw max bpp: %i, pipe bpp: %i, dithering: %i\n",
                    base_bpp, pipe_config->pipe_bpp, pipe_config->dither);

        /*
         * Make drm_calc_timestamping_constants in
         * drm_atomic_helper_update_legacy_modeset_state() happy
         */
        pipe_config->uapi.adjusted_mode = pipe_config->hw.adjusted_mode;

        return 0;
}

static int
intel_modeset_pipe_config_late(struct intel_crtc_state *crtc_state)
{
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->uapi.state);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_connector_state *conn_state;
        struct drm_connector *connector;
        int i;

        for_each_new_connector_in_state(&state->base, connector,
                                        conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);
                int ret;

                if (conn_state->crtc != &crtc->base ||
                    !encoder->compute_config_late)
                        continue;

                ret = encoder->compute_config_late(encoder, crtc_state,
                                                   conn_state);
                if (ret)
                        return ret;
        }

        return 0;
}

bool intel_fuzzy_clock_check(int clock1, int clock2)
{
        int diff;

        if (clock1 == clock2)
                return true;

        if (!clock1 || !clock2)
                return false;

        diff = abs(clock1 - clock2);

        if (((((diff + clock1 + clock2) * 100)) / (clock1 + clock2)) < 105)
                return true;

        return false;
}

static bool
intel_compare_m_n(unsigned int m, unsigned int n,
                  unsigned int m2, unsigned int n2,
                  bool exact)
{
        if (m == m2 && n == n2)
                return true;

        if (exact || !m || !n || !m2 || !n2)
                return false;

        BUILD_BUG_ON(DATA_LINK_M_N_MASK > INT_MAX);

        if (n > n2) {
                while (n > n2) {
                        m2 <<= 1;
                        n2 <<= 1;
                }
        } else if (n < n2) {
                while (n < n2) {
                        m <<= 1;
                        n <<= 1;
                }
        }

        if (n != n2)
                return false;

        return intel_fuzzy_clock_check(m, m2);
}

static bool
intel_compare_link_m_n(const struct intel_link_m_n *m_n,
                       const struct intel_link_m_n *m2_n2,
                       bool exact)
{
        return m_n->tu == m2_n2->tu &&
                intel_compare_m_n(m_n->gmch_m, m_n->gmch_n,
                                  m2_n2->gmch_m, m2_n2->gmch_n, exact) &&
                intel_compare_m_n(m_n->link_m, m_n->link_n,
                                  m2_n2->link_m, m2_n2->link_n, exact);
}

static bool
intel_compare_infoframe(const union hdmi_infoframe *a,
                        const union hdmi_infoframe *b)
{
        return memcmp(a, b, sizeof(*a)) == 0;
}

static bool
intel_compare_dp_vsc_sdp(const struct drm_dp_vsc_sdp *a,
                         const struct drm_dp_vsc_sdp *b)
{
        return memcmp(a, b, sizeof(*a)) == 0;
}

static void
pipe_config_infoframe_mismatch(struct drm_i915_private *dev_priv,
                               bool fastset, const char *name,
                               const union hdmi_infoframe *a,
                               const union hdmi_infoframe *b)
{
        if (fastset) {
                if (!drm_debug_enabled(DRM_UT_KMS))
                        return;

                drm_dbg_kms(&dev_priv->drm,
                            "fastset mismatch in %s infoframe\n", name);
                drm_dbg_kms(&dev_priv->drm, "expected:\n");
                hdmi_infoframe_log(KERN_DEBUG, dev_priv->drm.dev, a);
                drm_dbg_kms(&dev_priv->drm, "found:\n");
                hdmi_infoframe_log(KERN_DEBUG, dev_priv->drm.dev, b);
        } else {
                drm_err(&dev_priv->drm, "mismatch in %s infoframe\n", name);
                drm_err(&dev_priv->drm, "expected:\n");
                hdmi_infoframe_log(KERN_ERR, dev_priv->drm.dev, a);
                drm_err(&dev_priv->drm, "found:\n");
                hdmi_infoframe_log(KERN_ERR, dev_priv->drm.dev, b);
        }
}

static void
pipe_config_dp_vsc_sdp_mismatch(struct drm_i915_private *dev_priv,
                                bool fastset, const char *name,
                                const struct drm_dp_vsc_sdp *a,
                                const struct drm_dp_vsc_sdp *b)
{
        if (fastset) {
                if (!drm_debug_enabled(DRM_UT_KMS))
                        return;

                drm_dbg_kms(&dev_priv->drm,
                            "fastset mismatch in %s dp sdp\n", name);
                drm_dbg_kms(&dev_priv->drm, "expected:\n");
                drm_dp_vsc_sdp_log(KERN_DEBUG, dev_priv->drm.dev, a);
                drm_dbg_kms(&dev_priv->drm, "found:\n");
                drm_dp_vsc_sdp_log(KERN_DEBUG, dev_priv->drm.dev, b);
        } else {
                drm_err(&dev_priv->drm, "mismatch in %s dp sdp\n", name);
                drm_err(&dev_priv->drm, "expected:\n");
                drm_dp_vsc_sdp_log(KERN_ERR, dev_priv->drm.dev, a);
                drm_err(&dev_priv->drm, "found:\n");
                drm_dp_vsc_sdp_log(KERN_ERR, dev_priv->drm.dev, b);
        }
}

static void __printf(4, 5)
pipe_config_mismatch(bool fastset, const struct intel_crtc *crtc,
                     const char *name, const char *format, ...)
{
        struct drm_i915_private *i915 = to_i915(crtc->base.dev);
        struct va_format vaf;
        va_list args;

        va_start(args, format);
        vaf.fmt = format;
        vaf.va = &args;

        if (fastset)
                drm_dbg_kms(&i915->drm,
                            "[CRTC:%d:%s] fastset mismatch in %s %pV\n",
                            crtc->base.base.id, crtc->base.name, name, &vaf);
        else
                drm_err(&i915->drm, "[CRTC:%d:%s] mismatch in %s %pV\n",
                        crtc->base.base.id, crtc->base.name, name, &vaf);

        va_end(args);
}

static bool fastboot_enabled(struct drm_i915_private *dev_priv)
{
        if (dev_priv->params.fastboot != -1)
                return dev_priv->params.fastboot;

        /* Enable fastboot by default on Skylake and newer */
        if (INTEL_GEN(dev_priv) >= 9)
                return true;

        /* Enable fastboot by default on VLV and CHV */
        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                return true;

        /* Disabled by default on all others */
        return false;
}

static bool
intel_pipe_config_compare(const struct intel_crtc_state *current_config,
                          const struct intel_crtc_state *pipe_config,
                          bool fastset)
{
        struct drm_i915_private *dev_priv = to_i915(current_config->uapi.crtc->dev);
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
        bool ret = true;
        u32 bp_gamma = 0;
        bool fixup_inherited = fastset &&
                current_config->inherited && !pipe_config->inherited;

        if (fixup_inherited && !fastboot_enabled(dev_priv)) {
                drm_dbg_kms(&dev_priv->drm,
                            "initial modeset and fastboot not set\n");
                ret = false;
        }

#define PIPE_CONF_CHECK_X(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected 0x%08x, found 0x%08x)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_I(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected %i, found %i)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_BOOL(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc,  __stringify(name), \
                                     "(expected %s, found %s)", \
                                     yesno(current_config->name), \
                                     yesno(pipe_config->name)); \
                ret = false; \
        } \
} while (0)

/*
 * Checks state where we only read out the enabling, but not the entire
 * state itself (like full infoframes or ELD for audio). These states
 * require a full modeset on bootup to fix up.
 */
#define PIPE_CONF_CHECK_BOOL_INCOMPLETE(name) do { \
        if (!fixup_inherited || (!current_config->name && !pipe_config->name)) { \
                PIPE_CONF_CHECK_BOOL(name); \
        } else { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "unable to verify whether state matches exactly, forcing modeset (expected %s, found %s)", \
                                     yesno(current_config->name), \
                                     yesno(pipe_config->name)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_P(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected %p, found %p)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_M_N(name) do { \
        if (!intel_compare_link_m_n(&current_config->name, \
                                    &pipe_config->name,\
                                    !fastset)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected tu %i gmch %i/%i link %i/%i, " \
                                     "found tu %i, gmch %i/%i link %i/%i)", \
                                     current_config->name.tu, \
                                     current_config->name.gmch_m, \
                                     current_config->name.gmch_n, \
                                     current_config->name.link_m, \
                                     current_config->name.link_n, \
                                     pipe_config->name.tu, \
                                     pipe_config->name.gmch_m, \
                                     pipe_config->name.gmch_n, \
                                     pipe_config->name.link_m, \
                                     pipe_config->name.link_n); \
                ret = false; \
        } \
} while (0)

/* This is required for BDW+ where there is only one set of registers for
 * switching between high and low RR.
 * This macro can be used whenever a comparison has to be made between one
 * hw state and multiple sw state variables.
 */
#define PIPE_CONF_CHECK_M_N_ALT(name, alt_name) do { \
        if (!intel_compare_link_m_n(&current_config->name, \
                                    &pipe_config->name, !fastset) && \
            !intel_compare_link_m_n(&current_config->alt_name, \
                                    &pipe_config->name, !fastset)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected tu %i gmch %i/%i link %i/%i, " \
                                     "or tu %i gmch %i/%i link %i/%i, " \
                                     "found tu %i, gmch %i/%i link %i/%i)", \
                                     current_config->name.tu, \
                                     current_config->name.gmch_m, \
                                     current_config->name.gmch_n, \
                                     current_config->name.link_m, \
                                     current_config->name.link_n, \
                                     current_config->alt_name.tu, \
                                     current_config->alt_name.gmch_m, \
                                     current_config->alt_name.gmch_n, \
                                     current_config->alt_name.link_m, \
                                     current_config->alt_name.link_n, \
                                     pipe_config->name.tu, \
                                     pipe_config->name.gmch_m, \
                                     pipe_config->name.gmch_n, \
                                     pipe_config->name.link_m, \
                                     pipe_config->name.link_n); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_FLAGS(name, mask) do { \
        if ((current_config->name ^ pipe_config->name) & (mask)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(%x) (expected %i, found %i)", \
                                     (mask), \
                                     current_config->name & (mask), \
                                     pipe_config->name & (mask)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_CLOCK_FUZZY(name) do { \
        if (!intel_fuzzy_clock_check(current_config->name, pipe_config->name)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected %i, found %i)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_INFOFRAME(name) do { \
        if (!intel_compare_infoframe(&current_config->infoframes.name, \
                                     &pipe_config->infoframes.name)) { \
                pipe_config_infoframe_mismatch(dev_priv, fastset, __stringify(name), \
                                               &current_config->infoframes.name, \
                                               &pipe_config->infoframes.name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_DP_VSC_SDP(name) do { \
        if (!current_config->has_psr && !pipe_config->has_psr && \
            !intel_compare_dp_vsc_sdp(&current_config->infoframes.name, \
                                      &pipe_config->infoframes.name)) { \
                pipe_config_dp_vsc_sdp_mismatch(dev_priv, fastset, __stringify(name), \
                                                &current_config->infoframes.name, \
                                                &pipe_config->infoframes.name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_COLOR_LUT(name1, name2, bit_precision) do { \
        if (current_config->name1 != pipe_config->name1) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name1), \
                                "(expected %i, found %i, won't compare lut values)", \
                                current_config->name1, \
                                pipe_config->name1); \
                ret = false;\
        } else { \
                if (!intel_color_lut_equal(current_config->name2, \
                                        pipe_config->name2, pipe_config->name1, \
                                        bit_precision)) { \
                        pipe_config_mismatch(fastset, crtc, __stringify(name2), \
                                        "hw_state doesn't match sw_state"); \
                        ret = false; \
                } \
        } \
} while (0)

#define PIPE_CONF_QUIRK(quirk) \
        ((current_config->quirks | pipe_config->quirks) & (quirk))

        PIPE_CONF_CHECK_I(cpu_transcoder);

        PIPE_CONF_CHECK_BOOL(has_pch_encoder);
        PIPE_CONF_CHECK_I(fdi_lanes);
        PIPE_CONF_CHECK_M_N(fdi_m_n);

        PIPE_CONF_CHECK_I(lane_count);
        PIPE_CONF_CHECK_X(lane_lat_optim_mask);

        if (INTEL_GEN(dev_priv) < 8) {
                PIPE_CONF_CHECK_M_N(dp_m_n);

                if (current_config->has_drrs)
                        PIPE_CONF_CHECK_M_N(dp_m2_n2);
        } else
                PIPE_CONF_CHECK_M_N_ALT(dp_m_n, dp_m2_n2);

        PIPE_CONF_CHECK_X(output_types);

        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hdisplay);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_htotal);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hblank_start);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hblank_end);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hsync_start);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hsync_end);

        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vdisplay);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vtotal);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vblank_start);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vblank_end);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vsync_start);
        PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vsync_end);

        PIPE_CONF_CHECK_I(pixel_multiplier);
        PIPE_CONF_CHECK_I(output_format);
        PIPE_CONF_CHECK_BOOL(has_hdmi_sink);
        if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                PIPE_CONF_CHECK_BOOL(limited_color_range);

        PIPE_CONF_CHECK_BOOL(hdmi_scrambling);
        PIPE_CONF_CHECK_BOOL(hdmi_high_tmds_clock_ratio);
        PIPE_CONF_CHECK_BOOL(has_infoframe);
        PIPE_CONF_CHECK_BOOL(fec_enable);

        PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_audio);

        PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                              DRM_MODE_FLAG_INTERLACE);

        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS)) {
                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                      DRM_MODE_FLAG_PHSYNC);
                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                      DRM_MODE_FLAG_NHSYNC);
                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                      DRM_MODE_FLAG_PVSYNC);
                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                      DRM_MODE_FLAG_NVSYNC);
        }

        PIPE_CONF_CHECK_X(gmch_pfit.control);
        /* pfit ratios are autocomputed by the hw on gen4+ */
        if (INTEL_GEN(dev_priv) < 4)
                PIPE_CONF_CHECK_X(gmch_pfit.pgm_ratios);
        PIPE_CONF_CHECK_X(gmch_pfit.lvds_border_bits);

        /*
         * Changing the EDP transcoder input mux
         * (A_ONOFF vs. A_ON) requires a full modeset.
         */
        PIPE_CONF_CHECK_BOOL(pch_pfit.force_thru);

        if (!fastset) {
                PIPE_CONF_CHECK_I(pipe_src_w);
                PIPE_CONF_CHECK_I(pipe_src_h);

                PIPE_CONF_CHECK_BOOL(pch_pfit.enabled);
                if (current_config->pch_pfit.enabled) {
                        PIPE_CONF_CHECK_I(pch_pfit.dst.x1);
                        PIPE_CONF_CHECK_I(pch_pfit.dst.y1);
                        PIPE_CONF_CHECK_I(pch_pfit.dst.x2);
                        PIPE_CONF_CHECK_I(pch_pfit.dst.y2);
                }

                PIPE_CONF_CHECK_I(scaler_state.scaler_id);
                PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);

                PIPE_CONF_CHECK_X(gamma_mode);
                if (IS_CHERRYVIEW(dev_priv))
                        PIPE_CONF_CHECK_X(cgm_mode);
                else
                        PIPE_CONF_CHECK_X(csc_mode);
                PIPE_CONF_CHECK_BOOL(gamma_enable);
                PIPE_CONF_CHECK_BOOL(csc_enable);

                PIPE_CONF_CHECK_I(linetime);
                PIPE_CONF_CHECK_I(ips_linetime);

                bp_gamma = intel_color_get_gamma_bit_precision(pipe_config);
                if (bp_gamma)
                        PIPE_CONF_CHECK_COLOR_LUT(gamma_mode, hw.gamma_lut, bp_gamma);
        }

        PIPE_CONF_CHECK_BOOL(double_wide);

        PIPE_CONF_CHECK_P(shared_dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll_md);
        PIPE_CONF_CHECK_X(dpll_hw_state.fp0);
        PIPE_CONF_CHECK_X(dpll_hw_state.fp1);
        PIPE_CONF_CHECK_X(dpll_hw_state.wrpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.spll);
        PIPE_CONF_CHECK_X(dpll_hw_state.ctrl1);
        PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr1);
        PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr2);
        PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr0);
        PIPE_CONF_CHECK_X(dpll_hw_state.ebb0);
        PIPE_CONF_CHECK_X(dpll_hw_state.ebb4);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll0);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll1);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll2);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll3);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll6);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll8);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll9);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll10);
        PIPE_CONF_CHECK_X(dpll_hw_state.pcsdw12);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_refclkin_ctl);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_clktop2_coreclkctl1);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_clktop2_hsclkctl);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_div0);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_div1);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_lf);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_frac_lock);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_ssc);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_bias);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_tdc_coldst_bias);

        PIPE_CONF_CHECK_X(dsi_pll.ctrl);
        PIPE_CONF_CHECK_X(dsi_pll.div);

        if (IS_G4X(dev_priv) || INTEL_GEN(dev_priv) >= 5)
                PIPE_CONF_CHECK_I(pipe_bpp);

        PIPE_CONF_CHECK_CLOCK_FUZZY(hw.adjusted_mode.crtc_clock);
        PIPE_CONF_CHECK_CLOCK_FUZZY(port_clock);

        PIPE_CONF_CHECK_I(min_voltage_level);

        PIPE_CONF_CHECK_X(infoframes.enable);
        PIPE_CONF_CHECK_X(infoframes.gcp);
        PIPE_CONF_CHECK_INFOFRAME(avi);
        PIPE_CONF_CHECK_INFOFRAME(spd);
        PIPE_CONF_CHECK_INFOFRAME(hdmi);
        PIPE_CONF_CHECK_INFOFRAME(drm);
        PIPE_CONF_CHECK_DP_VSC_SDP(vsc);

        PIPE_CONF_CHECK_X(sync_mode_slaves_mask);
        PIPE_CONF_CHECK_I(master_transcoder);

        PIPE_CONF_CHECK_I(dsc.compression_enable);
        PIPE_CONF_CHECK_I(dsc.dsc_split);
        PIPE_CONF_CHECK_I(dsc.compressed_bpp);

        PIPE_CONF_CHECK_I(mst_master_transcoder);

#undef PIPE_CONF_CHECK_X
#undef PIPE_CONF_CHECK_I
#undef PIPE_CONF_CHECK_BOOL
#undef PIPE_CONF_CHECK_BOOL_INCOMPLETE
#undef PIPE_CONF_CHECK_P
#undef PIPE_CONF_CHECK_FLAGS
#undef PIPE_CONF_CHECK_CLOCK_FUZZY
#undef PIPE_CONF_CHECK_COLOR_LUT
#undef PIPE_CONF_QUIRK

        return ret;
}

static void intel_pipe_config_sanity_check(struct drm_i915_private *dev_priv,
                                           const struct intel_crtc_state *pipe_config)
{
        if (pipe_config->has_pch_encoder) {
                int fdi_dotclock = intel_dotclock_calculate(intel_fdi_link_freq(dev_priv, pipe_config),
                                                            &pipe_config->fdi_m_n);
                int dotclock = pipe_config->hw.adjusted_mode.crtc_clock;

                /*
                 * FDI already provided one idea for the dotclock.
                 * Yell if the encoder disagrees.
                 */
                drm_WARN(&dev_priv->drm,
                         !intel_fuzzy_clock_check(fdi_dotclock, dotclock),
                         "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
                         fdi_dotclock, dotclock);
        }
}

static void verify_wm_state(struct intel_crtc *crtc,
                            struct intel_crtc_state *new_crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct skl_hw_state {
                struct skl_ddb_entry ddb_y[I915_MAX_PLANES];
                struct skl_ddb_entry ddb_uv[I915_MAX_PLANES];
                struct skl_pipe_wm wm;
        } *hw;
        struct skl_pipe_wm *sw_wm;
        struct skl_ddb_entry *hw_ddb_entry, *sw_ddb_entry;
        u8 hw_enabled_slices;
        const enum pipe pipe = crtc->pipe;
        int plane, level, max_level = ilk_wm_max_level(dev_priv);

        if (INTEL_GEN(dev_priv) < 9 || !new_crtc_state->hw.active)
                return;

        hw = kzalloc(sizeof(*hw), GFP_KERNEL);
        if (!hw)
                return;

        skl_pipe_wm_get_hw_state(crtc, &hw->wm);
        sw_wm = &new_crtc_state->wm.skl.optimal;

        skl_pipe_ddb_get_hw_state(crtc, hw->ddb_y, hw->ddb_uv);

        hw_enabled_slices = intel_enabled_dbuf_slices_mask(dev_priv);

        if (INTEL_GEN(dev_priv) >= 11 &&
            hw_enabled_slices != dev_priv->dbuf.enabled_slices)
                drm_err(&dev_priv->drm,
                        "mismatch in DBUF Slices (expected 0x%x, got 0x%x)\n",
                        dev_priv->dbuf.enabled_slices,
                        hw_enabled_slices);

        /* planes */
        for_each_universal_plane(dev_priv, pipe, plane) {
                struct skl_plane_wm *hw_plane_wm, *sw_plane_wm;

                hw_plane_wm = &hw->wm.planes[plane];
                sw_plane_wm = &sw_wm->planes[plane];

                /* Watermarks */
                for (level = 0; level <= max_level; level++) {
                        if (skl_wm_level_equals(&hw_plane_wm->wm[level],
                                                &sw_plane_wm->wm[level]) ||
                            (level == 0 && skl_wm_level_equals(&hw_plane_wm->wm[level],
                                                               &sw_plane_wm->sagv_wm0)))
                                continue;

                        drm_err(&dev_priv->drm,
                                "mismatch in WM pipe %c plane %d level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                pipe_name(pipe), plane + 1, level,
                                sw_plane_wm->wm[level].plane_en,
                                sw_plane_wm->wm[level].plane_res_b,
                                sw_plane_wm->wm[level].plane_res_l,
                                hw_plane_wm->wm[level].plane_en,
                                hw_plane_wm->wm[level].plane_res_b,
                                hw_plane_wm->wm[level].plane_res_l);
                }

                if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
                                         &sw_plane_wm->trans_wm)) {
                        drm_err(&dev_priv->drm,
                                "mismatch in trans WM pipe %c plane %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                pipe_name(pipe), plane + 1,
                                sw_plane_wm->trans_wm.plane_en,
                                sw_plane_wm->trans_wm.plane_res_b,
                                sw_plane_wm->trans_wm.plane_res_l,
                                hw_plane_wm->trans_wm.plane_en,
                                hw_plane_wm->trans_wm.plane_res_b,
                                hw_plane_wm->trans_wm.plane_res_l);
                }

                /* DDB */
                hw_ddb_entry = &hw->ddb_y[plane];
                sw_ddb_entry = &new_crtc_state->wm.skl.plane_ddb_y[plane];

                if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
                        drm_err(&dev_priv->drm,
                                "mismatch in DDB state pipe %c plane %d (expected (%u,%u), found (%u,%u))\n",
                                pipe_name(pipe), plane + 1,
                                sw_ddb_entry->start, sw_ddb_entry->end,
                                hw_ddb_entry->start, hw_ddb_entry->end);
                }
        }

        /*
         * cursor
         * If the cursor plane isn't active, we may not have updated it's ddb
         * allocation. In that case since the ddb allocation will be updated
         * once the plane becomes visible, we can skip this check
         */
        if (1) {
                struct skl_plane_wm *hw_plane_wm, *sw_plane_wm;

                hw_plane_wm = &hw->wm.planes[PLANE_CURSOR];
                sw_plane_wm = &sw_wm->planes[PLANE_CURSOR];

                /* Watermarks */
                for (level = 0; level <= max_level; level++) {
                        if (skl_wm_level_equals(&hw_plane_wm->wm[level],
                                                &sw_plane_wm->wm[level]) ||
                            (level == 0 && skl_wm_level_equals(&hw_plane_wm->wm[level],
                                                               &sw_plane_wm->sagv_wm0)))
                                continue;

                        drm_err(&dev_priv->drm,
                                "mismatch in WM pipe %c cursor level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                pipe_name(pipe), level,
                                sw_plane_wm->wm[level].plane_en,
                                sw_plane_wm->wm[level].plane_res_b,
                                sw_plane_wm->wm[level].plane_res_l,
                                hw_plane_wm->wm[level].plane_en,
                                hw_plane_wm->wm[level].plane_res_b,
                                hw_plane_wm->wm[level].plane_res_l);
                }

                if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
                                         &sw_plane_wm->trans_wm)) {
                        drm_err(&dev_priv->drm,
                                "mismatch in trans WM pipe %c cursor (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                pipe_name(pipe),
                                sw_plane_wm->trans_wm.plane_en,
                                sw_plane_wm->trans_wm.plane_res_b,
                                sw_plane_wm->trans_wm.plane_res_l,
                                hw_plane_wm->trans_wm.plane_en,
                                hw_plane_wm->trans_wm.plane_res_b,
                                hw_plane_wm->trans_wm.plane_res_l);
                }

                /* DDB */
                hw_ddb_entry = &hw->ddb_y[PLANE_CURSOR];
                sw_ddb_entry = &new_crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR];

                if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
                        drm_err(&dev_priv->drm,
                                "mismatch in DDB state pipe %c cursor (expected (%u,%u), found (%u,%u))\n",
                                pipe_name(pipe),
                                sw_ddb_entry->start, sw_ddb_entry->end,
                                hw_ddb_entry->start, hw_ddb_entry->end);
                }
        }

        kfree(hw);
}

static void
verify_connector_state(struct intel_atomic_state *state,
                       struct intel_crtc *crtc)
{
        struct drm_connector *connector;
        struct drm_connector_state *new_conn_state;
        int i;

        for_each_new_connector_in_state(&state->base, connector, new_conn_state, i) {
                struct drm_encoder *encoder = connector->encoder;
                struct intel_crtc_state *crtc_state = NULL;

                if (new_conn_state->crtc != &crtc->base)
                        continue;

                if (crtc)
                        crtc_state = intel_atomic_get_new_crtc_state(state, crtc);

                intel_connector_verify_state(crtc_state, new_conn_state);

                I915_STATE_WARN(new_conn_state->best_encoder != encoder,
                     "connector's atomic encoder doesn't match legacy encoder\n");
        }
}

static void
verify_encoder_state(struct drm_i915_private *dev_priv, struct intel_atomic_state *state)
{
        struct intel_encoder *encoder;
        struct drm_connector *connector;
        struct drm_connector_state *old_conn_state, *new_conn_state;
        int i;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                bool enabled = false, found = false;
                enum pipe pipe;

                drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s]\n",
                            encoder->base.base.id,
                            encoder->base.name);

                for_each_oldnew_connector_in_state(&state->base, connector, old_conn_state,
                                                   new_conn_state, i) {
                        if (old_conn_state->best_encoder == &encoder->base)
                                found = true;

                        if (new_conn_state->best_encoder != &encoder->base)
                                continue;
                        found = enabled = true;

                        I915_STATE_WARN(new_conn_state->crtc !=
                                        encoder->base.crtc,
                             "connector's crtc doesn't match encoder crtc\n");
                }

                if (!found)
                        continue;

                I915_STATE_WARN(!!encoder->base.crtc != enabled,
                     "encoder's enabled state mismatch "
                     "(expected %i, found %i)\n",
                     !!encoder->base.crtc, enabled);

                if (!encoder->base.crtc) {
                        bool active;

                        active = encoder->get_hw_state(encoder, &pipe);
                        I915_STATE_WARN(active,
                             "encoder detached but still enabled on pipe %c.\n",
                             pipe_name(pipe));
                }
        }
}

static void
verify_crtc_state(struct intel_crtc *crtc,
                  struct intel_crtc_state *old_crtc_state,
                  struct intel_crtc_state *new_crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_encoder *encoder;
        struct intel_crtc_state *pipe_config = old_crtc_state;
        struct drm_atomic_state *state = old_crtc_state->uapi.state;
        bool active;

        __drm_atomic_helper_crtc_destroy_state(&old_crtc_state->uapi);
        intel_crtc_free_hw_state(old_crtc_state);
        intel_crtc_state_reset(old_crtc_state, crtc);
        old_crtc_state->uapi.state = state;

        drm_dbg_kms(&dev_priv->drm, "[CRTC:%d:%s]\n", crtc->base.base.id,
                    crtc->base.name);

        active = dev_priv->display.get_pipe_config(crtc, pipe_config);

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                active = new_crtc_state->hw.active;

        I915_STATE_WARN(new_crtc_state->hw.active != active,
                        "crtc active state doesn't match with hw state "
                        "(expected %i, found %i)\n",
                        new_crtc_state->hw.active, active);

        I915_STATE_WARN(crtc->active != new_crtc_state->hw.active,
                        "transitional active state does not match atomic hw state "
                        "(expected %i, found %i)\n",
                        new_crtc_state->hw.active, crtc->active);

        for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
                enum pipe pipe;

                active = encoder->get_hw_state(encoder, &pipe);
                I915_STATE_WARN(active != new_crtc_state->hw.active,
                                "[ENCODER:%i] active %i with crtc active %i\n",
                                encoder->base.base.id, active,
                                new_crtc_state->hw.active);

                I915_STATE_WARN(active && crtc->pipe != pipe,
                                "Encoder connected to wrong pipe %c\n",
                                pipe_name(pipe));

                if (active)
                        encoder->get_config(encoder, pipe_config);
        }

        intel_crtc_compute_pixel_rate(pipe_config);

        if (!new_crtc_state->hw.active)
                return;

        intel_pipe_config_sanity_check(dev_priv, pipe_config);

        if (!intel_pipe_config_compare(new_crtc_state,
                                       pipe_config, false)) {
                I915_STATE_WARN(1, "pipe state doesn't match!\n");
                intel_dump_pipe_config(pipe_config, NULL, "[hw state]");
                intel_dump_pipe_config(new_crtc_state, NULL, "[sw state]");
        }
}

static void
intel_verify_planes(struct intel_atomic_state *state)
{
        struct intel_plane *plane;
        const struct intel_plane_state *plane_state;
        int i;

        for_each_new_intel_plane_in_state(state, plane,
                                          plane_state, i)
                assert_plane(plane, plane_state->planar_slave ||
                             plane_state->uapi.visible);
}

static void
verify_single_dpll_state(struct drm_i915_private *dev_priv,
                         struct intel_shared_dpll *pll,
                         struct intel_crtc *crtc,
                         struct intel_crtc_state *new_crtc_state)
{
        struct intel_dpll_hw_state dpll_hw_state;
        unsigned int crtc_mask;
        bool active;

        memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));

        drm_dbg_kms(&dev_priv->drm, "%s\n", pll->info->name);

        active = pll->info->funcs->get_hw_state(dev_priv, pll, &dpll_hw_state);

        if (!(pll->info->flags & INTEL_DPLL_ALWAYS_ON)) {
                I915_STATE_WARN(!pll->on && pll->active_mask,
                     "pll in active use but not on in sw tracking\n");
                I915_STATE_WARN(pll->on && !pll->active_mask,
                     "pll is on but not used by any active crtc\n");
                I915_STATE_WARN(pll->on != active,
                     "pll on state mismatch (expected %i, found %i)\n",
                     pll->on, active);
        }

        if (!crtc) {
                I915_STATE_WARN(pll->active_mask & ~pll->state.crtc_mask,
                                "more active pll users than references: %x vs %x\n",
                                pll->active_mask, pll->state.crtc_mask);

                return;
        }

        crtc_mask = drm_crtc_mask(&crtc->base);

        if (new_crtc_state->hw.active)
                I915_STATE_WARN(!(pll->active_mask & crtc_mask),
                                "pll active mismatch (expected pipe %c in active mask 0x%02x)\n",
                                pipe_name(crtc->pipe), pll->active_mask);
        else
                I915_STATE_WARN(pll->active_mask & crtc_mask,
                                "pll active mismatch (didn't expect pipe %c in active mask 0x%02x)\n",
                                pipe_name(crtc->pipe), pll->active_mask);

        I915_STATE_WARN(!(pll->state.crtc_mask & crtc_mask),
                        "pll enabled crtcs mismatch (expected 0x%x in 0x%02x)\n",
                        crtc_mask, pll->state.crtc_mask);

        I915_STATE_WARN(pll->on && memcmp(&pll->state.hw_state,
                                          &dpll_hw_state,
                                          sizeof(dpll_hw_state)),
                        "pll hw state mismatch\n");
}

static void
verify_shared_dpll_state(struct intel_crtc *crtc,
                         struct intel_crtc_state *old_crtc_state,
                         struct intel_crtc_state *new_crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (new_crtc_state->shared_dpll)
                verify_single_dpll_state(dev_priv, new_crtc_state->shared_dpll, crtc, new_crtc_state);

        if (old_crtc_state->shared_dpll &&
            old_crtc_state->shared_dpll != new_crtc_state->shared_dpll) {
                unsigned int crtc_mask = drm_crtc_mask(&crtc->base);
                struct intel_shared_dpll *pll = old_crtc_state->shared_dpll;

                I915_STATE_WARN(pll->active_mask & crtc_mask,
                                "pll active mismatch (didn't expect pipe %c in active mask)\n",
                                pipe_name(crtc->pipe));
                I915_STATE_WARN(pll->state.crtc_mask & crtc_mask,
                                "pll enabled crtcs mismatch (found %x in enabled mask)\n",
                                pipe_name(crtc->pipe));
        }
}

static void
intel_modeset_verify_crtc(struct intel_crtc *crtc,
                          struct intel_atomic_state *state,
                          struct intel_crtc_state *old_crtc_state,
                          struct intel_crtc_state *new_crtc_state)
{
        if (!needs_modeset(new_crtc_state) && !new_crtc_state->update_pipe)
                return;

        verify_wm_state(crtc, new_crtc_state);
        verify_connector_state(state, crtc);
        verify_crtc_state(crtc, old_crtc_state, new_crtc_state);
        verify_shared_dpll_state(crtc, old_crtc_state, new_crtc_state);
}

static void
verify_disabled_dpll_state(struct drm_i915_private *dev_priv)
{
        int i;

        for (i = 0; i < dev_priv->dpll.num_shared_dpll; i++)
                verify_single_dpll_state(dev_priv,
                                         &dev_priv->dpll.shared_dplls[i],
                                         NULL, NULL);
}

static void
intel_modeset_verify_disabled(struct drm_i915_private *dev_priv,
                              struct intel_atomic_state *state)
{
        verify_encoder_state(dev_priv, state);
        verify_connector_state(state, NULL);
        verify_disabled_dpll_state(dev_priv);
}

static void
intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;

        drm_calc_timestamping_constants(&crtc->base, adjusted_mode);

        crtc->mode_flags = crtc_state->mode_flags;

        /*
         * The scanline counter increments at the leading edge of hsync.
         *
         * On most platforms it starts counting from vtotal-1 on the
         * first active line. That means the scanline counter value is
         * always one less than what we would expect. Ie. just after
         * start of vblank, which also occurs at start of hsync (on the
         * last active line), the scanline counter will read vblank_start-1.
         *
         * On gen2 the scanline counter starts counting from 1 instead
         * of vtotal-1, so we have to subtract one (or rather add vtotal-1
         * to keep the value positive), instead of adding one.
         *
         * On HSW+ the behaviour of the scanline counter depends on the output
         * type. For DP ports it behaves like most other platforms, but on HDMI
         * there's an extra 1 line difference. So we need to add two instead of
         * one to the value.
         *
         * On VLV/CHV DSI the scanline counter would appear to increment
         * approx. 1/3 of a scanline before start of vblank. Unfortunately
         * that means we can't tell whether we're in vblank or not while
         * we're on that particular line. We must still set scanline_offset
         * to 1 so that the vblank timestamps come out correct when we query
         * the scanline counter from within the vblank interrupt handler.
         * However if queried just before the start of vblank we'll get an
         * answer that's slightly in the future.
         */
        if (IS_GEN(dev_priv, 2)) {
                int vtotal;

                vtotal = adjusted_mode->crtc_vtotal;
                if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
                        vtotal /= 2;

                crtc->scanline_offset = vtotal - 1;
        } else if (HAS_DDI(dev_priv) &&
                   intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
                crtc->scanline_offset = 2;
        } else {
                crtc->scanline_offset = 1;
        }
}

static void intel_modeset_clear_plls(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc_state *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        if (!dev_priv->display.crtc_compute_clock)
                return;

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (!needs_modeset(new_crtc_state))
                        continue;

                intel_release_shared_dplls(state, crtc);
        }
}

/*
 * This implements the workaround described in the "notes" section of the mode
 * set sequence documentation. When going from no pipes or single pipe to
 * multiple pipes, and planes are enabled after the pipe, we need to wait at
 * least 2 vblanks on the first pipe before enabling planes on the second pipe.
 */
static int hsw_mode_set_planes_workaround(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        struct intel_crtc_state *first_crtc_state = NULL;
        struct intel_crtc_state *other_crtc_state = NULL;
        enum pipe first_pipe = INVALID_PIPE, enabled_pipe = INVALID_PIPE;
        int i;

        /* look at all crtc's that are going to be enabled in during modeset */
        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                if (!crtc_state->hw.active ||
                    !needs_modeset(crtc_state))
                        continue;

                if (first_crtc_state) {
                        other_crtc_state = crtc_state;
                        break;
                } else {
                        first_crtc_state = crtc_state;
                        first_pipe = crtc->pipe;
                }
        }

        /* No workaround needed? */
        if (!first_crtc_state)
                return 0;

        /* w/a possibly needed, check how many crtc's are already enabled. */
        for_each_intel_crtc(state->base.dev, crtc) {
                crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                crtc_state->hsw_workaround_pipe = INVALID_PIPE;

                if (!crtc_state->hw.active ||
                    needs_modeset(crtc_state))
                        continue;

                /* 2 or more enabled crtcs means no need for w/a */
                if (enabled_pipe != INVALID_PIPE)
                        return 0;

                enabled_pipe = crtc->pipe;
        }

        if (enabled_pipe != INVALID_PIPE)
                first_crtc_state->hsw_workaround_pipe = enabled_pipe;
        else if (other_crtc_state)
                other_crtc_state->hsw_workaround_pipe = first_pipe;

        return 0;
}

u8 intel_calc_active_pipes(struct intel_atomic_state *state,
                           u8 active_pipes)
{
        const struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                if (crtc_state->hw.active)
                        active_pipes |= BIT(crtc->pipe);
                else
                        active_pipes &= ~BIT(crtc->pipe);
        }

        return active_pipes;
}

static int intel_modeset_checks(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        int ret;

        state->modeset = true;
        state->active_pipes = intel_calc_active_pipes(state, dev_priv->active_pipes);

        if (state->active_pipes != dev_priv->active_pipes) {
                ret = _intel_atomic_lock_global_state(state);
                if (ret)
                        return ret;
        }

        if (IS_HASWELL(dev_priv))
                return hsw_mode_set_planes_workaround(state);

        return 0;
}

/*
 * Handle calculation of various watermark data at the end of the atomic check
 * phase.  The code here should be run after the per-crtc and per-plane 'check'
 * handlers to ensure that all derived state has been updated.
 */
static int calc_watermark_data(struct intel_atomic_state *state)
{
        struct drm_device *dev = state->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        /* Is there platform-specific watermark information to calculate? */
        if (dev_priv->display.compute_global_watermarks)
                return dev_priv->display.compute_global_watermarks(state);

        return 0;
}

static void intel_crtc_check_fastset(const struct intel_crtc_state *old_crtc_state,
                                     struct intel_crtc_state *new_crtc_state)
{
        if (!intel_pipe_config_compare(old_crtc_state, new_crtc_state, true))
                return;

        new_crtc_state->uapi.mode_changed = false;
        new_crtc_state->update_pipe = true;
}

static void intel_crtc_copy_fastset(const struct intel_crtc_state *old_crtc_state,
                                    struct intel_crtc_state *new_crtc_state)
{
        /*
         * If we're not doing the full modeset we want to
         * keep the current M/N values as they may be
         * sufficiently different to the computed values
         * to cause problems.
         *
         * FIXME: should really copy more fuzzy state here
         */
        new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
        new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
        new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
        new_crtc_state->has_drrs = old_crtc_state->has_drrs;
}

static int intel_crtc_add_planes_to_state(struct intel_atomic_state *state,
                                          struct intel_crtc *crtc,
                                          u8 plane_ids_mask)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_plane *plane;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                struct intel_plane_state *plane_state;

                if ((plane_ids_mask & BIT(plane->id)) == 0)
                        continue;

                plane_state = intel_atomic_get_plane_state(state, plane);
                if (IS_ERR(plane_state))
                        return PTR_ERR(plane_state);
        }

        return 0;
}

static bool active_planes_affects_min_cdclk(struct drm_i915_private *dev_priv)
{
        /* See {hsw,vlv,ivb}_plane_ratio() */
        return IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv) ||
                IS_CHERRYVIEW(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
                IS_IVYBRIDGE(dev_priv) || (INTEL_GEN(dev_priv) >= 11);
}

static int intel_atomic_check_planes(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        struct intel_crtc *crtc;
        int i, ret;

        ret = icl_add_linked_planes(state);
        if (ret)
                return ret;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                ret = intel_plane_atomic_check(state, plane);
                if (ret) {
                        drm_dbg_atomic(&dev_priv->drm,
                                       "[PLANE:%d:%s] atomic driver check failed\n",
                                       plane->base.base.id, plane->base.name);
                        return ret;
                }
        }

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                u8 old_active_planes, new_active_planes;

                ret = icl_check_nv12_planes(new_crtc_state);
                if (ret)
                        return ret;

                /*
                 * On some platforms the number of active planes affects
                 * the planes' minimum cdclk calculation. Add such planes
                 * to the state before we compute the minimum cdclk.
                 */
                if (!active_planes_affects_min_cdclk(dev_priv))
                        continue;

                old_active_planes = old_crtc_state->active_planes & ~BIT(PLANE_CURSOR);
                new_active_planes = new_crtc_state->active_planes & ~BIT(PLANE_CURSOR);

                /*
                 * Not only the number of planes, but if the plane configuration had
                 * changed might already mean we need to recompute min CDCLK,
                 * because different planes might consume different amount of Dbuf bandwidth
                 * according to formula: Bw per plane = Pixel rate * bpp * pipe/plane scale factor
                 */
                if (old_active_planes == new_active_planes)
                        continue;

                ret = intel_crtc_add_planes_to_state(state, crtc, new_active_planes);
                if (ret)
                        return ret;
        }

        return 0;
}

static int intel_atomic_check_cdclk(struct intel_atomic_state *state,
                                    bool *need_cdclk_calc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_cdclk_state *new_cdclk_state;
        struct intel_plane_state *plane_state;
        struct intel_bw_state *new_bw_state;
        struct intel_plane *plane;
        int min_cdclk = 0;
        enum pipe pipe;
        int ret;
        int i;
        /*
         * active_planes bitmask has been updated, and potentially
         * affected planes are part of the state. We can now
         * compute the minimum cdclk for each plane.
         */
        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                ret = intel_plane_calc_min_cdclk(state, plane, need_cdclk_calc);
                if (ret)
                        return ret;
        }

        new_cdclk_state = intel_atomic_get_new_cdclk_state(state);

        if (new_cdclk_state && new_cdclk_state->force_min_cdclk_changed)
                *need_cdclk_calc = true;

        ret = dev_priv->display.bw_calc_min_cdclk(state);
        if (ret)
                return ret;

        new_bw_state = intel_atomic_get_new_bw_state(state);

        if (!new_cdclk_state || !new_bw_state)
                return 0;

        for_each_pipe(dev_priv, pipe) {
                min_cdclk = max(new_cdclk_state->min_cdclk[pipe], min_cdclk);

                /*
                 * Currently do this change only if we need to increase
                 */
                if (new_bw_state->min_cdclk > min_cdclk)
                        *need_cdclk_calc = true;
        }

        return 0;
}

static int intel_atomic_check_crtcs(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                int ret = intel_crtc_atomic_check(state, crtc);
                struct drm_i915_private *i915 = to_i915(crtc->base.dev);
                if (ret) {
                        drm_dbg_atomic(&i915->drm,
                                       "[CRTC:%d:%s] atomic driver check failed\n",
                                       crtc->base.base.id, crtc->base.name);
                        return ret;
                }
        }

        return 0;
}

static bool intel_cpu_transcoders_need_modeset(struct intel_atomic_state *state,
                                               u8 transcoders)
{
        const struct intel_crtc_state *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (new_crtc_state->hw.enable &&
                    transcoders & BIT(new_crtc_state->cpu_transcoder) &&
                    needs_modeset(new_crtc_state))
                        return true;
        }

        return false;
}

/**
 * intel_atomic_check - validate state object
 * @dev: drm device
 * @_state: state to validate
 */
static int intel_atomic_check(struct drm_device *dev,
                              struct drm_atomic_state *_state)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_atomic_state *state = to_intel_atomic_state(_state);
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_crtc *crtc;
        int ret, i;
        bool any_ms = false;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (new_crtc_state->inherited != old_crtc_state->inherited)
                        new_crtc_state->uapi.mode_changed = true;
        }

        ret = drm_atomic_helper_check_modeset(dev, &state->base);
        if (ret)
                goto fail;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!needs_modeset(new_crtc_state)) {
                        /* Light copy */
                        intel_crtc_copy_uapi_to_hw_state_nomodeset(new_crtc_state);

                        continue;
                }

                ret = intel_crtc_prepare_cleared_state(new_crtc_state);
                if (ret)
                        goto fail;

                if (!new_crtc_state->hw.enable)
                        continue;

                ret = intel_modeset_pipe_config(new_crtc_state);
                if (ret)
                        goto fail;
        }

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!needs_modeset(new_crtc_state))
                        continue;

                ret = intel_modeset_pipe_config_late(new_crtc_state);
                if (ret)
                        goto fail;

                intel_crtc_check_fastset(old_crtc_state, new_crtc_state);
        }

        /**
         * Check if fastset is allowed by external dependencies like other
         * pipes and transcoders.
         *
         * Right now it only forces a fullmodeset when the MST master
         * transcoder did not changed but the pipe of the master transcoder
         * needs a fullmodeset so all slaves also needs to do a fullmodeset or
         * in case of port synced crtcs, if one of the synced crtcs
         * needs a full modeset, all other synced crtcs should be
         * forced a full modeset.
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (!new_crtc_state->hw.enable || needs_modeset(new_crtc_state))
                        continue;

                if (intel_dp_mst_is_slave_trans(new_crtc_state)) {
                        enum transcoder master = new_crtc_state->mst_master_transcoder;

                        if (intel_cpu_transcoders_need_modeset(state, BIT(master))) {
                                new_crtc_state->uapi.mode_changed = true;
                                new_crtc_state->update_pipe = false;
                        }
                }

                if (is_trans_port_sync_mode(new_crtc_state)) {
                        u8 trans = new_crtc_state->sync_mode_slaves_mask;

                        if (new_crtc_state->master_transcoder != INVALID_TRANSCODER)
                                trans |= BIT(new_crtc_state->master_transcoder);

                        if (intel_cpu_transcoders_need_modeset(state, trans)) {
                                new_crtc_state->uapi.mode_changed = true;
                                new_crtc_state->update_pipe = false;
                        }
                }
        }

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (needs_modeset(new_crtc_state)) {
                        any_ms = true;
                        continue;
                }

                if (!new_crtc_state->update_pipe)
                        continue;

                intel_crtc_copy_fastset(old_crtc_state, new_crtc_state);
        }

        if (any_ms && !check_digital_port_conflicts(state)) {
                drm_dbg_kms(&dev_priv->drm,
                            "rejecting conflicting digital port configuration\n");
                ret = EINVAL;
                goto fail;
        }

        ret = drm_dp_mst_atomic_check(&state->base);
        if (ret)
                goto fail;

        ret = intel_atomic_check_planes(state);
        if (ret)
                goto fail;

        /*
         * distrust_bios_wm will force a full dbuf recomputation
         * but the hardware state will only get updated accordingly
         * if state->modeset==true. Hence distrust_bios_wm==true &&
         * state->modeset==false is an invalid combination which
         * would cause the hardware and software dbuf state to get
         * out of sync. We must prevent that.
         *
         * FIXME clean up this mess and introduce better
         * state tracking for dbuf.
         */
        if (dev_priv->wm.distrust_bios_wm)
                any_ms = true;

        if (any_ms) {
                ret = intel_modeset_checks(state);
                if (ret)
                        goto fail;
        }

        intel_fbc_choose_crtc(dev_priv, state);
        ret = calc_watermark_data(state);
        if (ret)
                goto fail;

        ret = intel_bw_atomic_check(state);
        if (ret)
                goto fail;

        ret = intel_atomic_check_cdclk(state, &any_ms);
        if (ret)
                goto fail;

        if (any_ms) {
                ret = intel_modeset_calc_cdclk(state);
                if (ret)
                        return ret;

                intel_modeset_clear_plls(state);
        }

        ret = intel_atomic_check_crtcs(state);
        if (ret)
                goto fail;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!needs_modeset(new_crtc_state) &&
                    !new_crtc_state->update_pipe)
                        continue;

                intel_dump_pipe_config(new_crtc_state, state,
                                       needs_modeset(new_crtc_state) ?
                                       "[modeset]" : "[fastset]");
        }

        return 0;

 fail:
        if (ret == -EDEADLK)
                return ret;

        /*
         * FIXME would probably be nice to know which crtc specifically
         * caused the failure, in cases where we can pinpoint it.
         */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i)
                intel_dump_pipe_config(new_crtc_state, state, "[failed]");

        return ret;
}

static int intel_atomic_prepare_commit(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i, ret;

        ret = drm_atomic_helper_prepare_planes(state->base.dev, &state->base);
        if (ret < 0)
                return ret;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                bool mode_changed = needs_modeset(crtc_state);

                if (mode_changed || crtc_state->update_pipe ||
                    crtc_state->uapi.color_mgmt_changed) {
                        intel_dsb_prepare(crtc_state);
                }
        }

        return 0;
}

u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_vblank_crtc *vblank = &dev->vblank[drm_crtc_index(&crtc->base)];

        if (!vblank->max_vblank_count)
                return (u32)drm_crtc_accurate_vblank_count(&crtc->base);

        return crtc->base.funcs->get_vblank_counter(&crtc->base);
}

void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!IS_GEN(dev_priv, 2) || crtc_state->active_planes)
                intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);

        if (crtc_state->has_pch_encoder) {
                enum pipe pch_transcoder =
                        intel_crtc_pch_transcoder(crtc);

                intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder, true);
        }
}

static void intel_pipe_fastset(const struct intel_crtc_state *old_crtc_state,
                               const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /*
         * Update pipe size and adjust fitter if needed: the reason for this is
         * that in compute_mode_changes we check the native mode (not the pfit
         * mode) to see if we can flip rather than do a full mode set. In the
         * fastboot case, we'll flip, but if we don't update the pipesrc and
         * pfit state, we'll end up with a big fb scanned out into the wrong
         * sized surface.
         */
        intel_set_pipe_src_size(new_crtc_state);

        /* on skylake this is done by detaching scalers */
        if (INTEL_GEN(dev_priv) >= 9) {
                skl_detach_scalers(new_crtc_state);

                if (new_crtc_state->pch_pfit.enabled)
                        skl_pfit_enable(new_crtc_state);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                if (new_crtc_state->pch_pfit.enabled)
                        ilk_pfit_enable(new_crtc_state);
                else if (old_crtc_state->pch_pfit.enabled)
                        ilk_pfit_disable(old_crtc_state);
        }

        /*
         * The register is supposedly single buffered so perhaps
         * not 100% correct to do this here. But SKL+ calculate
         * this based on the adjust pixel rate so pfit changes do
         * affect it and so it must be updated for fastsets.
         * HSW/BDW only really need this here for fastboot, after
         * that the value should not change without a full modeset.
         */
        if (INTEL_GEN(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                hsw_set_linetime_wm(new_crtc_state);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_set_pipe_chicken(crtc);
}

static void commit_pipe_config(struct intel_atomic_state *state,
                               struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        bool modeset = needs_modeset(new_crtc_state);

        /*
         * During modesets pipe configuration was programmed as the
         * CRTC was enabled.
         */
        if (!modeset) {
                if (new_crtc_state->uapi.color_mgmt_changed ||
                    new_crtc_state->update_pipe)
                        intel_color_commit(new_crtc_state);

                if (INTEL_GEN(dev_priv) >= 9)
                        skl_detach_scalers(new_crtc_state);

                if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
                        bdw_set_pipemisc(new_crtc_state);

                if (new_crtc_state->update_pipe)
                        intel_pipe_fastset(old_crtc_state, new_crtc_state);
        }

        if (dev_priv->display.atomic_update_watermarks)
                dev_priv->display.atomic_update_watermarks(state, crtc);
}

static void intel_enable_crtc(struct intel_atomic_state *state,
                              struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);

        if (!needs_modeset(new_crtc_state))
                return;

        intel_crtc_update_active_timings(new_crtc_state);

        dev_priv->display.crtc_enable(state, crtc);

        /* vblanks work again, re-enable pipe CRC. */
        intel_crtc_enable_pipe_crc(crtc);
}

static void intel_update_crtc(struct intel_atomic_state *state,
                              struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        bool modeset = needs_modeset(new_crtc_state);

        if (!modeset) {
                if (new_crtc_state->preload_luts &&
                    (new_crtc_state->uapi.color_mgmt_changed ||
                     new_crtc_state->update_pipe))
                        intel_color_load_luts(new_crtc_state);

                intel_pre_plane_update(state, crtc);

                if (new_crtc_state->update_pipe)
                        intel_encoders_update_pipe(state, crtc);
        }

        if (new_crtc_state->update_pipe && !new_crtc_state->enable_fbc)
                intel_fbc_disable(crtc);
        else
                intel_fbc_enable(state, crtc);

        /* Perform vblank evasion around commit operation */
        intel_pipe_update_start(new_crtc_state);

        commit_pipe_config(state, crtc);

        if (INTEL_GEN(dev_priv) >= 9)
                skl_update_planes_on_crtc(state, crtc);
        else
                i9xx_update_planes_on_crtc(state, crtc);

        intel_pipe_update_end(new_crtc_state);

        /*
         * We usually enable FIFO underrun interrupts as part of the
         * CRTC enable sequence during modesets.  But when we inherit a
         * valid pipe configuration from the BIOS we need to take care
         * of enabling them on the CRTC's first fastset.
         */
        if (new_crtc_state->update_pipe && !modeset &&
            old_crtc_state->inherited)
                intel_crtc_arm_fifo_underrun(crtc, new_crtc_state);
}


static void intel_old_crtc_state_disables(struct intel_atomic_state *state,
                                          struct intel_crtc_state *old_crtc_state,
                                          struct intel_crtc_state *new_crtc_state,
                                          struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);

        intel_crtc_disable_planes(state, crtc);

        /*
         * We need to disable pipe CRC before disabling the pipe,
         * or we race against vblank off.
         */
        intel_crtc_disable_pipe_crc(crtc);

        dev_priv->display.crtc_disable(state, crtc);
        crtc->active = false;
        intel_fbc_disable(crtc);
        intel_disable_shared_dpll(old_crtc_state);

        /* FIXME unify this for all platforms */
        if (!new_crtc_state->hw.active &&
            !HAS_GMCH(dev_priv) &&
            dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);
}

static void intel_commit_modeset_disables(struct intel_atomic_state *state)
{
        struct intel_crtc_state *new_crtc_state, *old_crtc_state;
        struct intel_crtc *crtc;
        u32 handled = 0;
        int i;

        /* Only disable port sync and MST slaves */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!needs_modeset(new_crtc_state))
                        continue;

                if (!old_crtc_state->hw.active)
                        continue;

                /* In case of Transcoder port Sync master slave CRTCs can be
                 * assigned in any order and we need to make sure that
                 * slave CRTCs are disabled first and then master CRTC since
                 * Slave vblanks are masked till Master Vblanks.
                 */
                if (!is_trans_port_sync_slave(old_crtc_state) &&
                    !intel_dp_mst_is_slave_trans(old_crtc_state))
                        continue;

                intel_pre_plane_update(state, crtc);
                intel_old_crtc_state_disables(state, old_crtc_state,
                                              new_crtc_state, crtc);
                handled |= BIT(crtc->pipe);
        }

        /* Disable everything else left on */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!needs_modeset(new_crtc_state) ||
                    (handled & BIT(crtc->pipe)))
                        continue;

                intel_pre_plane_update(state, crtc);
                if (old_crtc_state->hw.active)
                        intel_old_crtc_state_disables(state, old_crtc_state,
                                                      new_crtc_state, crtc);
        }
}

static void intel_commit_modeset_enables(struct intel_atomic_state *state)
{
        struct intel_crtc_state *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (!new_crtc_state->hw.active)
                        continue;

                intel_enable_crtc(state, crtc);
                intel_update_crtc(state, crtc);
        }
}

static void skl_commit_modeset_enables(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc *crtc;
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct skl_ddb_entry entries[I915_MAX_PIPES] = {};
        u8 update_pipes = 0, modeset_pipes = 0;
        int i;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if (!new_crtc_state->hw.active)
                        continue;

                /* ignore allocations for crtc's that have been turned off. */
                if (!needs_modeset(new_crtc_state)) {
                        entries[pipe] = old_crtc_state->wm.skl.ddb;
                        update_pipes |= BIT(pipe);
                } else {
                        modeset_pipes |= BIT(pipe);
                }
        }

        /*
         * Whenever the number of active pipes changes, we need to make sure we
         * update the pipes in the right order so that their ddb allocations
         * never overlap with each other between CRTC updates. Otherwise we'll
         * cause pipe underruns and other bad stuff.
         *
         * So first lets enable all pipes that do not need a fullmodeset as
         * those don't have any external dependency.
         */
        while (update_pipes) {
                for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                                    new_crtc_state, i) {
                        enum pipe pipe = crtc->pipe;

                        if ((update_pipes & BIT(pipe)) == 0)
                                continue;

                        if (skl_ddb_allocation_overlaps(&new_crtc_state->wm.skl.ddb,
                                                        entries, I915_MAX_PIPES, pipe))
                                continue;

                        entries[pipe] = new_crtc_state->wm.skl.ddb;
                        update_pipes &= ~BIT(pipe);

                        intel_update_crtc(state, crtc);

                        /*
                         * If this is an already active pipe, it's DDB changed,
                         * and this isn't the last pipe that needs updating
                         * then we need to wait for a vblank to pass for the
                         * new ddb allocation to take effect.
                         */
                        if (!skl_ddb_entry_equal(&new_crtc_state->wm.skl.ddb,
                                                 &old_crtc_state->wm.skl.ddb) &&
                            (update_pipes | modeset_pipes))
                                intel_wait_for_vblank(dev_priv, pipe);
                }
        }

        update_pipes = modeset_pipes;

        /*
         * Enable all pipes that needs a modeset and do not depends on other
         * pipes
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if ((modeset_pipes & BIT(pipe)) == 0)
                        continue;

                if (intel_dp_mst_is_slave_trans(new_crtc_state) ||
                    is_trans_port_sync_master(new_crtc_state))
                        continue;

                modeset_pipes &= ~BIT(pipe);

                intel_enable_crtc(state, crtc);
        }

        /*
         * Then we enable all remaining pipes that depend on other
         * pipes: MST slaves and port sync masters.
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if ((modeset_pipes & BIT(pipe)) == 0)
                        continue;

                modeset_pipes &= ~BIT(pipe);

                intel_enable_crtc(state, crtc);
        }

        /*
         * Finally we do the plane updates/etc. for all pipes that got enabled.
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if ((update_pipes & BIT(pipe)) == 0)
                        continue;

                drm_WARN_ON(&dev_priv->drm, skl_ddb_allocation_overlaps(&new_crtc_state->wm.skl.ddb,
                                                                        entries, I915_MAX_PIPES, pipe));

                entries[pipe] = new_crtc_state->wm.skl.ddb;
                update_pipes &= ~BIT(pipe);

                intel_update_crtc(state, crtc);
        }

        drm_WARN_ON(&dev_priv->drm, modeset_pipes);
        drm_WARN_ON(&dev_priv->drm, update_pipes);
}

static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
{
        struct intel_atomic_state *state, *next;
        struct llist_node *freed;

        freed = llist_del_all(&dev_priv->atomic_helper.free_list);
        llist_for_each_entry_safe(state, next, freed, freed)
                drm_atomic_state_put(&state->base);
}

static void intel_atomic_helper_free_state_worker(struct work_struct *work)
{
        struct drm_i915_private *dev_priv =
                container_of(work, typeof(*dev_priv), atomic_helper.free_work);

        intel_atomic_helper_free_state(dev_priv);
}

static void intel_atomic_commit_fence_wait(struct intel_atomic_state *intel_state)
{
        struct wait_queue_entry wait_fence, wait_reset;
        struct drm_i915_private *dev_priv = to_i915(intel_state->base.dev);

        init_wait_entry(&wait_fence, 0);
        init_wait_entry(&wait_reset, 0);
        for (;;) {
                prepare_to_wait(&intel_state->commit_ready.wait,
                                &wait_fence, TASK_UNINTERRUPTIBLE);
                prepare_to_wait(bit_waitqueue(&dev_priv->gt.reset.flags,
                                              I915_RESET_MODESET),
                                &wait_reset, TASK_UNINTERRUPTIBLE);


                if (i915_sw_fence_done(&intel_state->commit_ready) ||
                    test_bit(I915_RESET_MODESET, &dev_priv->gt.reset.flags))
                        break;

                schedule();
        }
        finish_wait(&intel_state->commit_ready.wait, &wait_fence);
        finish_wait(bit_waitqueue(&dev_priv->gt.reset.flags,
                                  I915_RESET_MODESET),
                    &wait_reset);
}

static void intel_cleanup_dsbs(struct intel_atomic_state *state)
{
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i)
                intel_dsb_cleanup(old_crtc_state);
}

static void intel_atomic_cleanup_work(struct work_struct *work)
{
        struct intel_atomic_state *state =
                container_of(work, struct intel_atomic_state, base.commit_work);
        struct drm_i915_private *i915 = to_i915(state->base.dev);

        intel_cleanup_dsbs(state);
        drm_atomic_helper_cleanup_planes(&i915->drm, &state->base);
        drm_atomic_helper_commit_cleanup_done(&state->base);
        drm_atomic_state_put(&state->base);

        intel_atomic_helper_free_state(i915);
}

static void intel_atomic_commit_tail(struct intel_atomic_state *state)
{
        struct drm_device *dev = state->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *new_crtc_state, *old_crtc_state;
        struct intel_crtc *crtc;
        u64 put_domains[I915_MAX_PIPES] = {};
        intel_wakeref_t wakeref = 0;
        int i;

        intel_atomic_commit_fence_wait(state);

        drm_atomic_helper_wait_for_dependencies(&state->base);

        if (state->modeset)
                wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_MODESET);

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (needs_modeset(new_crtc_state) ||
                    new_crtc_state->update_pipe) {

                        put_domains[crtc->pipe] =
                                modeset_get_crtc_power_domains(new_crtc_state);
                }
        }

        intel_commit_modeset_disables(state);

        /* FIXME: Eventually get rid of our crtc->config pointer */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
                crtc->config = new_crtc_state;

        if (state->modeset) {
                drm_atomic_helper_update_legacy_modeset_state(dev, &state->base);

                intel_set_cdclk_pre_plane_update(state);

                intel_modeset_verify_disabled(dev_priv, state);
        }

        intel_sagv_pre_plane_update(state);

        /* Complete the events for pipes that have now been disabled */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                bool modeset = needs_modeset(new_crtc_state);

                /* Complete events for now disable pipes here. */
                if (modeset && !new_crtc_state->hw.active && new_crtc_state->uapi.event) {
                        spin_lock_irq(&dev->event_lock);
                        drm_crtc_send_vblank_event(&crtc->base,
                                                   new_crtc_state->uapi.event);
                        spin_unlock_irq(&dev->event_lock);

                        new_crtc_state->uapi.event = NULL;
                }
        }

        if (state->modeset)
                intel_encoders_update_prepare(state);

        intel_dbuf_pre_plane_update(state);

        /* Now enable the clocks, plane, pipe, and connectors that we set up. */
        dev_priv->display.commit_modeset_enables(state);

        if (state->modeset) {
                intel_encoders_update_complete(state);

                intel_set_cdclk_post_plane_update(state);
        }

        /* FIXME: We should call drm_atomic_helper_commit_hw_done() here
         * already, but still need the state for the delayed optimization. To
         * fix this:
         * - wrap the optimization/post_plane_update stuff into a per-crtc work.
         * - schedule that vblank worker _before_ calling hw_done
         * - at the start of commit_tail, cancel it _synchrously
         * - switch over to the vblank wait helper in the core after that since
         *   we don't need out special handling any more.
         */
        drm_atomic_helper_wait_for_flip_done(dev, &state->base);

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (new_crtc_state->hw.active &&
                    !needs_modeset(new_crtc_state) &&
                    !new_crtc_state->preload_luts &&
                    (new_crtc_state->uapi.color_mgmt_changed ||
                     new_crtc_state->update_pipe))
                        intel_color_load_luts(new_crtc_state);
        }

        /*
         * Now that the vblank has passed, we can go ahead and program the
         * optimal watermarks on platforms that need two-step watermark
         * programming.
         *
         * TODO: Move this (and other cleanup) to an async worker eventually.
         */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                /*
                 * Gen2 reports pipe underruns whenever all planes are disabled.
                 * So re-enable underrun reporting after some planes get enabled.
                 *
                 * We do this before .optimize_watermarks() so that we have a
                 * chance of catching underruns with the intermediate watermarks
                 * vs. the new plane configuration.
                 */
                if (IS_GEN(dev_priv, 2) && planes_enabling(old_crtc_state, new_crtc_state))
                        intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);

                if (dev_priv->display.optimize_watermarks)
                        dev_priv->display.optimize_watermarks(state, crtc);
        }

        intel_dbuf_post_plane_update(state);

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                intel_post_plane_update(state, crtc);

                if (put_domains[i])
                        modeset_put_power_domains(dev_priv, put_domains[i]);

                intel_modeset_verify_crtc(crtc, state, old_crtc_state, new_crtc_state);

                /*
                 * DSB cleanup is done in cleanup_work aligning with framebuffer
                 * cleanup. So copy and reset the dsb structure to sync with
                 * commit_done and later do dsb cleanup in cleanup_work.
                 */
                old_crtc_state->dsb = fetch_and_zero(&new_crtc_state->dsb);
        }

        /* Underruns don't always raise interrupts, so check manually */
        intel_check_cpu_fifo_underruns(dev_priv);
        intel_check_pch_fifo_underruns(dev_priv);

        if (state->modeset)
                intel_verify_planes(state);

        intel_sagv_post_plane_update(state);

        drm_atomic_helper_commit_hw_done(&state->base);

        if (state->modeset) {
                /* As one of the primary mmio accessors, KMS has a high
                 * likelihood of triggering bugs in unclaimed access. After we
                 * finish modesetting, see if an error has been flagged, and if
                 * so enable debugging for the next modeset - and hope we catch
                 * the culprit.
                 */
                intel_uncore_arm_unclaimed_mmio_detection(&dev_priv->uncore);
                intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET, wakeref);
        }
        intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);

        /*
         * Defer the cleanup of the old state to a separate worker to not
         * impede the current task (userspace for blocking modesets) that
         * are executed inline. For out-of-line asynchronous modesets/flips,
         * deferring to a new worker seems overkill, but we would place a
         * schedule point (cond_resched()) here anyway to keep latencies
         * down.
         */
        INIT_WORK(&state->base.commit_work, intel_atomic_cleanup_work);
        queue_work(system_highpri_wq, &state->base.commit_work);
}

static void intel_atomic_commit_work(struct work_struct *work)
{
        struct intel_atomic_state *state =
                container_of(work, struct intel_atomic_state, base.commit_work);

        intel_atomic_commit_tail(state);
}

static int __i915_sw_fence_call
intel_atomic_commit_ready(struct i915_sw_fence *fence,
                          enum i915_sw_fence_notify notify)
{
        struct intel_atomic_state *state =
                container_of(fence, struct intel_atomic_state, commit_ready);

        switch (notify) {
        case FENCE_COMPLETE:
                /* we do blocking waits in the worker, nothing to do here */
                break;
        case FENCE_FREE:
                {
                        struct intel_atomic_helper *helper =
                                &to_i915(state->base.dev)->atomic_helper;

                        if (llist_add(&state->freed, &helper->free_list))
                                schedule_work(&helper->free_work);
                        break;
                }
        }

        return NOTIFY_DONE;
}

static void intel_atomic_track_fbs(struct intel_atomic_state *state)
{
        struct intel_plane_state *old_plane_state, *new_plane_state;
        struct intel_plane *plane;
        int i;

        for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
                                             new_plane_state, i)
                intel_frontbuffer_track(to_intel_frontbuffer(old_plane_state->hw.fb),
                                        to_intel_frontbuffer(new_plane_state->hw.fb),
                                        plane->frontbuffer_bit);
}

static void assert_global_state_locked(struct drm_i915_private *dev_priv)
{
        struct intel_crtc *crtc;

        for_each_intel_crtc(&dev_priv->drm, crtc)
                drm_modeset_lock_assert_held(&crtc->base.mutex);
}

static int intel_atomic_commit(struct drm_device *dev,
                               struct drm_atomic_state *_state,
                               bool nonblock)
{
        struct intel_atomic_state *state = to_intel_atomic_state(_state);
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret = 0;

        state->wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

        drm_atomic_state_get(&state->base);
        i915_sw_fence_init(&state->commit_ready,
                           intel_atomic_commit_ready);

        /*
         * The intel_legacy_cursor_update() fast path takes care
         * of avoiding the vblank waits for simple cursor
         * movement and flips. For cursor on/off and size changes,
         * we want to perform the vblank waits so that watermark
         * updates happen during the correct frames. Gen9+ have
         * double buffered watermarks and so shouldn't need this.
         *
         * Unset state->legacy_cursor_update before the call to
         * drm_atomic_helper_setup_commit() because otherwise
         * drm_atomic_helper_wait_for_flip_done() is a noop and
         * we get FIFO underruns because we didn't wait
         * for vblank.
         *
         * FIXME doing watermarks and fb cleanup from a vblank worker
         * (assuming we had any) would solve these problems.
         */
        if (INTEL_GEN(dev_priv) < 9 && state->base.legacy_cursor_update) {
                struct intel_crtc_state *new_crtc_state;
                struct intel_crtc *crtc;
                int i;

                for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
                        if (new_crtc_state->wm.need_postvbl_update ||
                            new_crtc_state->update_wm_post)
                                state->base.legacy_cursor_update = false;
        }

        ret = intel_atomic_prepare_commit(state);
        if (ret) {
                drm_dbg_atomic(&dev_priv->drm,
                               "Preparing state failed with %i\n", ret);
                i915_sw_fence_commit(&state->commit_ready);
                intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
                return ret;
        }

        ret = drm_atomic_helper_setup_commit(&state->base, nonblock);
        if (!ret)
                ret = drm_atomic_helper_swap_state(&state->base, true);
        if (!ret)
                intel_atomic_swap_global_state(state);

        if (ret) {
                struct intel_crtc_state *new_crtc_state;
                struct intel_crtc *crtc;
                int i;

                i915_sw_fence_commit(&state->commit_ready);

                for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
                        intel_dsb_cleanup(new_crtc_state);

                drm_atomic_helper_cleanup_planes(dev, &state->base);
                intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
                return ret;
        }
        dev_priv->wm.distrust_bios_wm = false;
        intel_shared_dpll_swap_state(state);
        intel_atomic_track_fbs(state);

        if (state->global_state_changed) {
                assert_global_state_locked(dev_priv);

                dev_priv->active_pipes = state->active_pipes;
        }

        drm_atomic_state_get(&state->base);
        INIT_WORK(&state->base.commit_work, intel_atomic_commit_work);

        i915_sw_fence_commit(&state->commit_ready);
        if (nonblock && state->modeset) {
                queue_work(dev_priv->modeset_wq, &state->base.commit_work);
        } else if (nonblock) {
                queue_work(dev_priv->flip_wq, &state->base.commit_work);
        } else {
                if (state->modeset)
                        flush_workqueue(dev_priv->modeset_wq);
                intel_atomic_commit_tail(state);
        }

        return 0;
}

struct wait_rps_boost {
        struct wait_queue_entry wait;

        struct drm_crtc *crtc;
        struct i915_request *request;
};

static int do_rps_boost(struct wait_queue_entry *_wait,
                        unsigned mode, int sync, void *key)
{
        struct wait_rps_boost *wait = container_of(_wait, typeof(*wait), wait);
        struct i915_request *rq = wait->request;

        /*
         * If we missed the vblank, but the request is already running it
         * is reasonable to assume that it will complete before the next
         * vblank without our intervention, so leave RPS alone.
         */
        if (!i915_request_started(rq))
                intel_rps_boost(rq);
        i915_request_put(rq);

        drm_crtc_vblank_put(wait->crtc);

        list_del(&wait->wait.entry);
        kfree(wait);
        return 1;
}

static void add_rps_boost_after_vblank(struct drm_crtc *crtc,
                                       struct dma_fence *fence)
{
        struct wait_rps_boost *wait;

        if (!dma_fence_is_i915(fence))
                return;

        if (INTEL_GEN(to_i915(crtc->dev)) < 6)
                return;

        if (drm_crtc_vblank_get(crtc))
                return;

        wait = kmalloc(sizeof(*wait), GFP_KERNEL);
        if (!wait) {
                drm_crtc_vblank_put(crtc);
                return;
        }

        wait->request = to_request(dma_fence_get(fence));
        wait->crtc = crtc;

        wait->wait.func = do_rps_boost;
        wait->wait.flags = 0;

        add_wait_queue(drm_crtc_vblank_waitqueue(crtc), &wait->wait);
}

static int intel_plane_pin_fb(struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        struct drm_framebuffer *fb = plane_state->hw.fb;
        struct i915_vma *vma;

        if (plane->id == PLANE_CURSOR &&
            INTEL_INFO(dev_priv)->display.cursor_needs_physical) {
                struct drm_i915_gem_object *obj = intel_fb_obj(fb);
                const int align = intel_cursor_alignment(dev_priv);
                int err;

                err = i915_gem_object_attach_phys(obj, align);
                if (err)
                        return err;
        }

        vma = intel_pin_and_fence_fb_obj(fb,
                                         &plane_state->view,
                                         intel_plane_uses_fence(plane_state),
                                         &plane_state->flags);
        if (IS_ERR(vma))
                return PTR_ERR(vma);

        plane_state->vma = vma;

        return 0;
}

static void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
{
        struct i915_vma *vma;

        vma = fetch_and_zero(&old_plane_state->vma);
        if (vma)
                intel_unpin_fb_vma(vma, old_plane_state->flags);
}

static void fb_obj_bump_render_priority(struct drm_i915_gem_object *obj)
{
        struct i915_sched_attr attr = {
                .priority = I915_USER_PRIORITY(I915_PRIORITY_DISPLAY),
        };

        i915_gem_object_wait_priority(obj, 0, &attr);
}

/**
 * intel_prepare_plane_fb - Prepare fb for usage on plane
 * @_plane: drm plane to prepare for
 * @_new_plane_state: the plane state being prepared
 *
 * Prepares a framebuffer for usage on a display plane.  Generally this
 * involves pinning the underlying object and updating the frontbuffer tracking
 * bits.  Some older platforms need special physical address handling for
 * cursor planes.
 *
 * Returns 0 on success, negative error code on failure.
 */
int
intel_prepare_plane_fb(struct drm_plane *_plane,
                       struct drm_plane_state *_new_plane_state)
{
        struct intel_plane *plane = to_intel_plane(_plane);
        struct intel_plane_state *new_plane_state =
                to_intel_plane_state(_new_plane_state);
        struct intel_atomic_state *state =
                to_intel_atomic_state(new_plane_state->uapi.state);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        const struct intel_plane_state *old_plane_state =
                intel_atomic_get_old_plane_state(state, plane);
        struct drm_i915_gem_object *obj = intel_fb_obj(new_plane_state->hw.fb);
        struct drm_i915_gem_object *old_obj = intel_fb_obj(old_plane_state->hw.fb);
        int ret;

        if (old_obj) {
                const struct intel_crtc_state *crtc_state =
                        intel_atomic_get_new_crtc_state(state,
                                                        to_intel_crtc(old_plane_state->hw.crtc));

                /* Big Hammer, we also need to ensure that any pending
                 * MI_WAIT_FOR_EVENT inside a user batch buffer on the
                 * current scanout is retired before unpinning the old
                 * framebuffer. Note that we rely on userspace rendering
                 * into the buffer attached to the pipe they are waiting
                 * on. If not, userspace generates a GPU hang with IPEHR
                 * point to the MI_WAIT_FOR_EVENT.
                 *
                 * This should only fail upon a hung GPU, in which case we
                 * can safely continue.
                 */
                if (needs_modeset(crtc_state)) {
                        ret = i915_sw_fence_await_reservation(&state->commit_ready,
                                                              old_obj->base.resv, NULL,
                                                              false, 0,
                                                              GFP_KERNEL);
                        if (ret < 0)
                                return ret;
                }
        }

        if (new_plane_state->uapi.fence) { /* explicit fencing */
                ret = i915_sw_fence_await_dma_fence(&state->commit_ready,
                                                    new_plane_state->uapi.fence,
                                                    i915_fence_timeout(dev_priv),
                                                    GFP_KERNEL);
                if (ret < 0)
                        return ret;
        }

        if (!obj)
                return 0;

        ret = i915_gem_object_pin_pages(obj);
        if (ret)
                return ret;

        ret = intel_plane_pin_fb(new_plane_state);

        i915_gem_object_unpin_pages(obj);
        if (ret)
                return ret;

        fb_obj_bump_render_priority(obj);
        i915_gem_object_flush_frontbuffer(obj, ORIGIN_DIRTYFB);

        if (!new_plane_state->uapi.fence) { /* implicit fencing */
                struct dma_fence *fence;

                ret = i915_sw_fence_await_reservation(&state->commit_ready,
                                                      obj->base.resv, NULL,
                                                      false,
                                                      i915_fence_timeout(dev_priv),
                                                      GFP_KERNEL);
                if (ret < 0)
                        goto unpin_fb;

                fence = dma_resv_get_excl_rcu(obj->base.resv);
                if (fence) {
                        add_rps_boost_after_vblank(new_plane_state->hw.crtc,
                                                   fence);
                        dma_fence_put(fence);
                }
        } else {
                add_rps_boost_after_vblank(new_plane_state->hw.crtc,
                                           new_plane_state->uapi.fence);
        }

        /*
         * We declare pageflips to be interactive and so merit a small bias
         * towards upclocking to deliver the frame on time. By only changing
         * the RPS thresholds to sample more regularly and aim for higher
         * clocks we can hopefully deliver low power workloads (like kodi)
         * that are not quite steady state without resorting to forcing
         * maximum clocks following a vblank miss (see do_rps_boost()).
         */
        if (!state->rps_interactive) {
                intel_rps_mark_interactive(&dev_priv->gt.rps, true);
                state->rps_interactive = true;
        }

        return 0;

unpin_fb:
        intel_plane_unpin_fb(new_plane_state);

        return ret;
}

/**
 * intel_cleanup_plane_fb - Cleans up an fb after plane use
 * @plane: drm plane to clean up for
 * @_old_plane_state: the state from the previous modeset
 *
 * Cleans up a framebuffer that has just been removed from a plane.
 */
void
intel_cleanup_plane_fb(struct drm_plane *plane,
                       struct drm_plane_state *_old_plane_state)
{
        struct intel_plane_state *old_plane_state =
                to_intel_plane_state(_old_plane_state);
        struct intel_atomic_state *state =
                to_intel_atomic_state(old_plane_state->uapi.state);
        struct drm_i915_private *dev_priv = to_i915(plane->dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(old_plane_state->hw.fb);

        if (!obj)
                return;

        if (state->rps_interactive) {
                intel_rps_mark_interactive(&dev_priv->gt.rps, false);
                state->rps_interactive = false;
        }

        /* Should only be called after a successful intel_prepare_plane_fb()! */
        intel_plane_unpin_fb(old_plane_state);
}

/**
 * intel_plane_destroy - destroy a plane
 * @plane: plane to destroy
 *
 * Common destruction function for all types of planes (primary, cursor,
 * sprite).
 */
void intel_plane_destroy(struct drm_plane *plane)
{
        drm_plane_cleanup(plane);
        kfree(to_intel_plane(plane));
}

static bool i8xx_plane_format_mod_supported(struct drm_plane *_plane,
                                            u32 format, u64 modifier)
{
        switch (modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                break;
        default:
                return false;
        }

        switch (format) {
        case DRM_FORMAT_C8:
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB1555:
        case DRM_FORMAT_XRGB8888:
                return modifier == DRM_FORMAT_MOD_LINEAR ||
                        modifier == I915_FORMAT_MOD_X_TILED;
        default:
                return false;
        }
}

static bool i965_plane_format_mod_supported(struct drm_plane *_plane,
                                            u32 format, u64 modifier)
{
        switch (modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                break;
        default:
                return false;
        }

        switch (format) {
        case DRM_FORMAT_C8:
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ARGB8888:
        case DRM_FORMAT_ABGR8888:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_ARGB2101010:
        case DRM_FORMAT_ABGR2101010:
        case DRM_FORMAT_XBGR16161616F:
                return modifier == DRM_FORMAT_MOD_LINEAR ||
                        modifier == I915_FORMAT_MOD_X_TILED;
        default:
                return false;
        }
}

static bool intel_cursor_format_mod_supported(struct drm_plane *_plane,
                                              u32 format, u64 modifier)
{
        return modifier == DRM_FORMAT_MOD_LINEAR &&
                format == DRM_FORMAT_ARGB8888;
}

static const struct drm_plane_funcs i965_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = i965_plane_format_mod_supported,
};

static const struct drm_plane_funcs i8xx_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = i8xx_plane_format_mod_supported,
};

static int
intel_legacy_cursor_update(struct drm_plane *_plane,
                           struct drm_crtc *_crtc,
                           struct drm_framebuffer *fb,
                           int crtc_x, int crtc_y,
                           unsigned int crtc_w, unsigned int crtc_h,
                           u32 src_x, u32 src_y,
                           u32 src_w, u32 src_h,
                           struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_plane *plane = to_intel_plane(_plane);
        struct intel_crtc *crtc = to_intel_crtc(_crtc);
        struct intel_plane_state *old_plane_state =
                to_intel_plane_state(plane->base.state);
        struct intel_plane_state *new_plane_state;
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        struct intel_crtc_state *new_crtc_state;
        int ret;

        /*
         * When crtc is inactive or there is a modeset pending,
         * wait for it to complete in the slowpath
         */
        if (!crtc_state->hw.active || needs_modeset(crtc_state) ||
            crtc_state->update_pipe)
                goto slow;

        /*
         * Don't do an async update if there is an outstanding commit modifying
         * the plane.  This prevents our async update's changes from getting
         * overridden by a previous synchronous update's state.
         */
        if (old_plane_state->uapi.commit &&
            !try_wait_for_completion(&old_plane_state->uapi.commit->hw_done))
                goto slow;

        /*
         * If any parameters change that may affect watermarks,
         * take the slowpath. Only changing fb or position should be
         * in the fastpath.
         */
        if (old_plane_state->uapi.crtc != &crtc->base ||
            old_plane_state->uapi.src_w != src_w ||
            old_plane_state->uapi.src_h != src_h ||
            old_plane_state->uapi.crtc_w != crtc_w ||
            old_plane_state->uapi.crtc_h != crtc_h ||
            !old_plane_state->uapi.fb != !fb)
                goto slow;

        new_plane_state = to_intel_plane_state(intel_plane_duplicate_state(&plane->base));
        if (!new_plane_state)
                return -ENOMEM;

        new_crtc_state = to_intel_crtc_state(intel_crtc_duplicate_state(&crtc->base));
        if (!new_crtc_state) {
                ret = -ENOMEM;
                goto out_free;
        }

        drm_atomic_set_fb_for_plane(&new_plane_state->uapi, fb);

        new_plane_state->uapi.src_x = src_x;
        new_plane_state->uapi.src_y = src_y;
        new_plane_state->uapi.src_w = src_w;
        new_plane_state->uapi.src_h = src_h;
        new_plane_state->uapi.crtc_x = crtc_x;
        new_plane_state->uapi.crtc_y = crtc_y;
        new_plane_state->uapi.crtc_w = crtc_w;
        new_plane_state->uapi.crtc_h = crtc_h;

        intel_plane_copy_uapi_to_hw_state(new_plane_state, new_plane_state);

        ret = intel_plane_atomic_check_with_state(crtc_state, new_crtc_state,
                                                  old_plane_state, new_plane_state);
        if (ret)
                goto out_free;

        ret = intel_plane_pin_fb(new_plane_state);
        if (ret)
                goto out_free;

        intel_frontbuffer_flush(to_intel_frontbuffer(new_plane_state->hw.fb),
                                ORIGIN_FLIP);
        intel_frontbuffer_track(to_intel_frontbuffer(old_plane_state->hw.fb),
                                to_intel_frontbuffer(new_plane_state->hw.fb),
                                plane->frontbuffer_bit);

        /* Swap plane state */
        plane->base.state = &new_plane_state->uapi;

        /*
         * We cannot swap crtc_state as it may be in use by an atomic commit or
         * page flip that's running simultaneously. If we swap crtc_state and
         * destroy the old state, we will cause a use-after-free there.
         *
         * Only update active_planes, which is needed for our internal
         * bookkeeping. Either value will do the right thing when updating
         * planes atomically. If the cursor was part of the atomic update then
         * we would have taken the slowpath.
         */
        crtc_state->active_planes = new_crtc_state->active_planes;

        if (new_plane_state->uapi.visible)
                intel_update_plane(plane, crtc_state, new_plane_state);
        else
                intel_disable_plane(plane, crtc_state);

        intel_plane_unpin_fb(old_plane_state);

out_free:
        if (new_crtc_state)
                intel_crtc_destroy_state(&crtc->base, &new_crtc_state->uapi);
        if (ret)
                intel_plane_destroy_state(&plane->base, &new_plane_state->uapi);
        else
                intel_plane_destroy_state(&plane->base, &old_plane_state->uapi);
        return ret;

slow:
        return drm_atomic_helper_update_plane(&plane->base, &crtc->base, fb,
                                              crtc_x, crtc_y, crtc_w, crtc_h,
                                              src_x, src_y, src_w, src_h, ctx);
}

static const struct drm_plane_funcs intel_cursor_plane_funcs = {
        .update_plane = intel_legacy_cursor_update,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = intel_cursor_format_mod_supported,
};

static bool i9xx_plane_has_fbc(struct drm_i915_private *dev_priv,
                               enum i9xx_plane_id i9xx_plane)
{
        if (!HAS_FBC(dev_priv))
                return false;

        if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                return i9xx_plane == PLANE_A; /* tied to pipe A */
        else if (IS_IVYBRIDGE(dev_priv))
                return i9xx_plane == PLANE_A || i9xx_plane == PLANE_B ||
                        i9xx_plane == PLANE_C;
        else if (INTEL_GEN(dev_priv) >= 4)
                return i9xx_plane == PLANE_A || i9xx_plane == PLANE_B;
        else
                return i9xx_plane == PLANE_A;
}

static struct intel_plane *
intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_plane *plane;
        const struct drm_plane_funcs *plane_funcs;
        unsigned int supported_rotations;
        const u32 *formats;
        int num_formats;
        int ret, zpos;

        if (INTEL_GEN(dev_priv) >= 9)
                return skl_universal_plane_create(dev_priv, pipe,
                                                  PLANE_PRIMARY);

        plane = intel_plane_alloc();
        if (IS_ERR(plane))
                return plane;

        plane->pipe = pipe;
        /*
         * On gen2/3 only plane A can do FBC, but the panel fitter and LVDS
         * port is hooked to pipe B. Hence we want plane A feeding pipe B.
         */
        if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) < 4 &&
            INTEL_NUM_PIPES(dev_priv) == 2)
                plane->i9xx_plane = (enum i9xx_plane_id) !pipe;
        else
                plane->i9xx_plane = (enum i9xx_plane_id) pipe;
        plane->id = PLANE_PRIMARY;
        plane->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, plane->id);

        plane->has_fbc = i9xx_plane_has_fbc(dev_priv, plane->i9xx_plane);
        if (plane->has_fbc) {
                struct intel_fbc *fbc = &dev_priv->fbc;

                fbc->possible_framebuffer_bits |= plane->frontbuffer_bit;
        }

        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                formats = vlv_primary_formats;
                num_formats = ARRAY_SIZE(vlv_primary_formats);
        } else if (INTEL_GEN(dev_priv) >= 4) {
                /*
                 * WaFP16GammaEnabling:ivb
                 * "Workaround : When using the 64-bit format, the plane
                 *  output on each color channel has one quarter amplitude.
                 *  It can be brought up to full amplitude by using pipe
                 *  gamma correction or pipe color space conversion to
                 *  multiply the plane output by four."
                 *
                 * There is no dedicated plane gamma for the primary plane,
                 * and using the pipe gamma/csc could conflict with other
                 * planes, so we choose not to expose fp16 on IVB primary
                 * planes. HSW primary planes no longer have this problem.
                 */
                if (IS_IVYBRIDGE(dev_priv)) {
                        formats = ivb_primary_formats;
                        num_formats = ARRAY_SIZE(ivb_primary_formats);
                } else {
                        formats = i965_primary_formats;
                        num_formats = ARRAY_SIZE(i965_primary_formats);
                }
        } else {
                formats = i8xx_primary_formats;
                num_formats = ARRAY_SIZE(i8xx_primary_formats);
        }

        if (INTEL_GEN(dev_priv) >= 4)
                plane_funcs = &i965_plane_funcs;
        else
                plane_funcs = &i8xx_plane_funcs;

        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                plane->min_cdclk = vlv_plane_min_cdclk;
        else if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                plane->min_cdclk = hsw_plane_min_cdclk;
        else if (IS_IVYBRIDGE(dev_priv))
                plane->min_cdclk = ivb_plane_min_cdclk;
        else
                plane->min_cdclk = i9xx_plane_min_cdclk;

        plane->max_stride = i9xx_plane_max_stride;
        plane->update_plane = i9xx_update_plane;
        plane->disable_plane = i9xx_disable_plane;
        plane->get_hw_state = i9xx_plane_get_hw_state;
        plane->check_plane = i9xx_plane_check;

        if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                ret = drm_universal_plane_init(&dev_priv->drm, &plane->base,
                                               0, plane_funcs,
                                               formats, num_formats,
                                               i9xx_format_modifiers,
                                               DRM_PLANE_TYPE_PRIMARY,
                                               "primary %c", pipe_name(pipe));
        else
                ret = drm_universal_plane_init(&dev_priv->drm, &plane->base,
                                               0, plane_funcs,
                                               formats, num_formats,
                                               i9xx_format_modifiers,
                                               DRM_PLANE_TYPE_PRIMARY,
                                               "plane %c",
                                               plane_name(plane->i9xx_plane));
        if (ret)
                goto fail;

        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
                        DRM_MODE_REFLECT_X;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180;
        } else {
                supported_rotations = DRM_MODE_ROTATE_0;
        }

        if (INTEL_GEN(dev_priv) >= 4)
                drm_plane_create_rotation_property(&plane->base,
                                                   DRM_MODE_ROTATE_0,
                                                   supported_rotations);

        zpos = 0;
        drm_plane_create_zpos_immutable_property(&plane->base, zpos);

        drm_plane_helper_add(&plane->base, &intel_plane_helper_funcs);

        return plane;

fail:
        intel_plane_free(plane);

        return ERR_PTR(ret);
}

static struct intel_plane *
intel_cursor_plane_create(struct drm_i915_private *dev_priv,
                          enum pipe pipe)
{
        struct intel_plane *cursor;
        int ret, zpos;

        cursor = intel_plane_alloc();
        if (IS_ERR(cursor))
                return cursor;

        cursor->pipe = pipe;
        cursor->i9xx_plane = (enum i9xx_plane_id) pipe;
        cursor->id = PLANE_CURSOR;
        cursor->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, cursor->id);

        if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
                cursor->max_stride = i845_cursor_max_stride;
                cursor->update_plane = i845_update_cursor;
                cursor->disable_plane = i845_disable_cursor;
                cursor->get_hw_state = i845_cursor_get_hw_state;
                cursor->check_plane = i845_check_cursor;
        } else {
                cursor->max_stride = i9xx_cursor_max_stride;
                cursor->update_plane = i9xx_update_cursor;
                cursor->disable_plane = i9xx_disable_cursor;
                cursor->get_hw_state = i9xx_cursor_get_hw_state;
                cursor->check_plane = i9xx_check_cursor;
        }

        cursor->cursor.base = ~0;
        cursor->cursor.cntl = ~0;

        if (IS_I845G(dev_priv) || IS_I865G(dev_priv) || HAS_CUR_FBC(dev_priv))
                cursor->cursor.size = ~0;

        ret = drm_universal_plane_init(&dev_priv->drm, &cursor->base,
                                       0, &intel_cursor_plane_funcs,
                                       intel_cursor_formats,
                                       ARRAY_SIZE(intel_cursor_formats),
                                       cursor_format_modifiers,
                                       DRM_PLANE_TYPE_CURSOR,
                                       "cursor %c", pipe_name(pipe));
        if (ret)
                goto fail;

        if (INTEL_GEN(dev_priv) >= 4)
                drm_plane_create_rotation_property(&cursor->base,
                                                   DRM_MODE_ROTATE_0,
                                                   DRM_MODE_ROTATE_0 |
                                                   DRM_MODE_ROTATE_180);

        zpos = RUNTIME_INFO(dev_priv)->num_sprites[pipe] + 1;
        drm_plane_create_zpos_immutable_property(&cursor->base, zpos);

        if (INTEL_GEN(dev_priv) >= 12)
                drm_plane_enable_fb_damage_clips(&cursor->base);

        drm_plane_helper_add(&cursor->base, &intel_plane_helper_funcs);

        return cursor;

fail:
        intel_plane_free(cursor);

        return ERR_PTR(ret);
}

#define INTEL_CRTC_FUNCS \
        .gamma_set = drm_atomic_helper_legacy_gamma_set, \
        .set_config = drm_atomic_helper_set_config, \
        .destroy = intel_crtc_destroy, \
        .page_flip = drm_atomic_helper_page_flip, \
        .atomic_duplicate_state = intel_crtc_duplicate_state, \
        .atomic_destroy_state = intel_crtc_destroy_state, \
        .set_crc_source = intel_crtc_set_crc_source, \
        .verify_crc_source = intel_crtc_verify_crc_source, \
        .get_crc_sources = intel_crtc_get_crc_sources

static const struct drm_crtc_funcs bdw_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        .get_vblank_counter = g4x_get_vblank_counter,
        .enable_vblank = bdw_enable_vblank,
        .disable_vblank = bdw_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static const struct drm_crtc_funcs ilk_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        .get_vblank_counter = g4x_get_vblank_counter,
        .enable_vblank = ilk_enable_vblank,
        .disable_vblank = ilk_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static const struct drm_crtc_funcs g4x_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        .get_vblank_counter = g4x_get_vblank_counter,
        .enable_vblank = i965_enable_vblank,
        .disable_vblank = i965_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static const struct drm_crtc_funcs i965_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        .get_vblank_counter = i915_get_vblank_counter,
        .enable_vblank = i965_enable_vblank,
        .disable_vblank = i965_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static const struct drm_crtc_funcs i915gm_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        .get_vblank_counter = i915_get_vblank_counter,
        .enable_vblank = i915gm_enable_vblank,
        .disable_vblank = i915gm_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static const struct drm_crtc_funcs i915_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        .get_vblank_counter = i915_get_vblank_counter,
        .enable_vblank = i8xx_enable_vblank,
        .disable_vblank = i8xx_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static const struct drm_crtc_funcs i8xx_crtc_funcs = {
        INTEL_CRTC_FUNCS,

        /* no hw vblank counter */
        .enable_vblank = i8xx_enable_vblank,
        .disable_vblank = i8xx_disable_vblank,
        .get_vblank_timestamp = intel_crtc_get_vblank_timestamp,
};

static struct intel_crtc *intel_crtc_alloc(void)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;

        crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
        if (!crtc)
                return ERR_PTR(-ENOMEM);

        crtc_state = intel_crtc_state_alloc(crtc);
        if (!crtc_state) {
                kfree(crtc);
                return ERR_PTR(-ENOMEM);
        }

        crtc->base.state = &crtc_state->uapi;
        crtc->config = crtc_state;

        return crtc;
}

static void intel_crtc_free(struct intel_crtc *crtc)
{
        intel_crtc_destroy_state(&crtc->base, crtc->base.state);
        kfree(crtc);
}

static void intel_plane_possible_crtcs_init(struct drm_i915_private *dev_priv)
{
        struct intel_plane *plane;

        for_each_intel_plane(&dev_priv->drm, plane) {
                struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv,
                                                                  plane->pipe);

                plane->base.possible_crtcs = drm_crtc_mask(&crtc->base);
        }
}

static int intel_crtc_init(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_plane *primary, *cursor;
        const struct drm_crtc_funcs *funcs;
        struct intel_crtc *crtc;
        int sprite, ret;

        crtc = intel_crtc_alloc();
        if (IS_ERR(crtc))
                return PTR_ERR(crtc);

        crtc->pipe = pipe;
        crtc->num_scalers = RUNTIME_INFO(dev_priv)->num_scalers[pipe];

        primary = intel_primary_plane_create(dev_priv, pipe);
        if (IS_ERR(primary)) {
                ret = PTR_ERR(primary);
                goto fail;
        }
        crtc->plane_ids_mask |= BIT(primary->id);

        for_each_sprite(dev_priv, pipe, sprite) {
                struct intel_plane *plane;

                plane = intel_sprite_plane_create(dev_priv, pipe, sprite);
                if (IS_ERR(plane)) {
                        ret = PTR_ERR(plane);
                        goto fail;
                }
                crtc->plane_ids_mask |= BIT(plane->id);
        }

        cursor = intel_cursor_plane_create(dev_priv, pipe);
        if (IS_ERR(cursor)) {
                ret = PTR_ERR(cursor);
                goto fail;
        }
        crtc->plane_ids_mask |= BIT(cursor->id);

        if (HAS_GMCH(dev_priv)) {
                if (IS_CHERRYVIEW(dev_priv) ||
                    IS_VALLEYVIEW(dev_priv) || IS_G4X(dev_priv))
                        funcs = &g4x_crtc_funcs;
                else if (IS_GEN(dev_priv, 4))
                        funcs = &i965_crtc_funcs;
                else if (IS_I945GM(dev_priv) || IS_I915GM(dev_priv))
                        funcs = &i915gm_crtc_funcs;
                else if (IS_GEN(dev_priv, 3))
                        funcs = &i915_crtc_funcs;
                else
                        funcs = &i8xx_crtc_funcs;
        } else {
                if (INTEL_GEN(dev_priv) >= 8)
                        funcs = &bdw_crtc_funcs;
                else
                        funcs = &ilk_crtc_funcs;
        }

        ret = drm_crtc_init_with_planes(&dev_priv->drm, &crtc->base,
                                        &primary->base, &cursor->base,
                                        funcs, "pipe %c", pipe_name(pipe));
        if (ret)
                goto fail;

        BUG_ON(pipe >= ARRAY_SIZE(dev_priv->pipe_to_crtc_mapping) ||
               dev_priv->pipe_to_crtc_mapping[pipe] != NULL);
        dev_priv->pipe_to_crtc_mapping[pipe] = crtc;

        if (INTEL_GEN(dev_priv) < 9) {
                enum i9xx_plane_id i9xx_plane = primary->i9xx_plane;

                BUG_ON(i9xx_plane >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
                       dev_priv->plane_to_crtc_mapping[i9xx_plane] != NULL);
                dev_priv->plane_to_crtc_mapping[i9xx_plane] = crtc;
        }

        intel_color_init(crtc);

        intel_crtc_crc_init(crtc);

        drm_WARN_ON(&dev_priv->drm, drm_crtc_index(&crtc->base) != crtc->pipe);

        return 0;

fail:
        intel_crtc_free(crtc);

        return ret;
}

int intel_get_pipe_from_crtc_id_ioctl(struct drm_device *dev, void *data,
                                      struct drm_file *file)
{
        struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
        struct drm_crtc *drmmode_crtc;
        struct intel_crtc *crtc;

        drmmode_crtc = drm_crtc_find(dev, file, pipe_from_crtc_id->crtc_id);
        if (!drmmode_crtc)
                return -ENOENT;

        crtc = to_intel_crtc(drmmode_crtc);
        pipe_from_crtc_id->pipe = crtc->pipe;

        return 0;
}

static u32 intel_encoder_possible_clones(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_encoder *source_encoder;
        u32 possible_clones = 0;

        for_each_intel_encoder(dev, source_encoder) {
                if (encoders_cloneable(encoder, source_encoder))
                        possible_clones |= drm_encoder_mask(&source_encoder->base);
        }

        return possible_clones;
}

static u32 intel_encoder_possible_crtcs(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_crtc *crtc;
        u32 possible_crtcs = 0;

        for_each_intel_crtc(dev, crtc) {
                if (encoder->pipe_mask & BIT(crtc->pipe))
                        possible_crtcs |= drm_crtc_mask(&crtc->base);
        }

        return possible_crtcs;
}

static bool ilk_has_edp_a(struct drm_i915_private *dev_priv)
{
        if (!IS_MOBILE(dev_priv))
                return false;

        if ((intel_de_read(dev_priv, DP_A) & DP_DETECTED) == 0)
                return false;

        if (IS_GEN(dev_priv, 5) && (intel_de_read(dev_priv, FUSE_STRAP) & ILK_eDP_A_DISABLE))
                return false;

        return true;
}

static bool intel_ddi_crt_present(struct drm_i915_private *dev_priv)
{
        if (INTEL_GEN(dev_priv) >= 9)
                return false;

        if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
                return false;

        if (HAS_PCH_LPT_H(dev_priv) &&
            intel_de_read(dev_priv, SFUSE_STRAP) & SFUSE_STRAP_CRT_DISABLED)
                return false;

        /* DDI E can't be used if DDI A requires 4 lanes */
        if (intel_de_read(dev_priv, DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES)
                return false;

        if (!dev_priv->vbt.int_crt_support)
                return false;

        return true;
}

void intel_pps_unlock_regs_wa(struct drm_i915_private *dev_priv)
{
        int pps_num;
        int pps_idx;

        if (HAS_DDI(dev_priv))
                return;
        /*
         * This w/a is needed at least on CPT/PPT, but to be sure apply it
         * everywhere where registers can be write protected.
         */
        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                pps_num = 2;
        else
                pps_num = 1;

        for (pps_idx = 0; pps_idx < pps_num; pps_idx++) {
                u32 val = intel_de_read(dev_priv, PP_CONTROL(pps_idx));

                val = (val & ~PANEL_UNLOCK_MASK) | PANEL_UNLOCK_REGS;
                intel_de_write(dev_priv, PP_CONTROL(pps_idx), val);
        }
}

static void intel_pps_init(struct drm_i915_private *dev_priv)
{
        if (HAS_PCH_SPLIT(dev_priv) || IS_GEN9_LP(dev_priv))
                dev_priv->pps_mmio_base = PCH_PPS_BASE;
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                dev_priv->pps_mmio_base = VLV_PPS_BASE;
        else
                dev_priv->pps_mmio_base = PPS_BASE;

        intel_pps_unlock_regs_wa(dev_priv);
}

static void intel_setup_outputs(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        bool dpd_is_edp = false;

        intel_pps_init(dev_priv);

        if (!HAS_DISPLAY(dev_priv) || !INTEL_DISPLAY_ENABLED(dev_priv))
                return;

        if (IS_ROCKETLAKE(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_D);       /* DDI TC1 */
                intel_ddi_init(dev_priv, PORT_E);       /* DDI TC2 */
        } else if (INTEL_GEN(dev_priv) >= 12) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_D);
                intel_ddi_init(dev_priv, PORT_E);
                intel_ddi_init(dev_priv, PORT_F);
                intel_ddi_init(dev_priv, PORT_G);
                intel_ddi_init(dev_priv, PORT_H);
                intel_ddi_init(dev_priv, PORT_I);
                icl_dsi_init(dev_priv);
        } else if (IS_ELKHARTLAKE(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D);
                icl_dsi_init(dev_priv);
        } else if (IS_GEN(dev_priv, 11)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D);
                intel_ddi_init(dev_priv, PORT_E);
                /*
                 * On some ICL SKUs port F is not present. No strap bits for
                 * this, so rely on VBT.
                 * Work around broken VBTs on SKUs known to have no port F.
                 */
                if (IS_ICL_WITH_PORT_F(dev_priv) &&
                    intel_bios_is_port_present(dev_priv, PORT_F))
                        intel_ddi_init(dev_priv, PORT_F);

                icl_dsi_init(dev_priv);
        } else if (IS_GEN9_LP(dev_priv)) {
                /*
                 * FIXME: Broxton doesn't support port detection via the
                 * DDI_BUF_CTL_A or SFUSE_STRAP registers, find another way to
                 * detect the ports.
                 */
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);

                vlv_dsi_init(dev_priv);
        } else if (HAS_DDI(dev_priv)) {
                int found;

                if (intel_ddi_crt_present(dev_priv))
                        intel_crt_init(dev_priv);

                /*
                 * Haswell uses DDI functions to detect digital outputs.
                 * On SKL pre-D0 the strap isn't connected, so we assume
                 * it's there.
                 */
                found = intel_de_read(dev_priv, DDI_BUF_CTL(PORT_A)) & DDI_INIT_DISPLAY_DETECTED;
                /* WaIgnoreDDIAStrap: skl */
                if (found || IS_GEN9_BC(dev_priv))
                        intel_ddi_init(dev_priv, PORT_A);

                /* DDI B, C, D, and F detection is indicated by the SFUSE_STRAP
                 * register */
                found = intel_de_read(dev_priv, SFUSE_STRAP);

                if (found & SFUSE_STRAP_DDIB_DETECTED)
                        intel_ddi_init(dev_priv, PORT_B);
                if (found & SFUSE_STRAP_DDIC_DETECTED)
                        intel_ddi_init(dev_priv, PORT_C);
                if (found & SFUSE_STRAP_DDID_DETECTED)
                        intel_ddi_init(dev_priv, PORT_D);
                if (found & SFUSE_STRAP_DDIF_DETECTED)
                        intel_ddi_init(dev_priv, PORT_F);
                /*
                 * On SKL we don't have a way to detect DDI-E so we rely on VBT.
                 */
                if (IS_GEN9_BC(dev_priv) &&
                    intel_bios_is_port_present(dev_priv, PORT_E))
                        intel_ddi_init(dev_priv, PORT_E);

        } else if (HAS_PCH_SPLIT(dev_priv)) {
                int found;

                /*
                 * intel_edp_init_connector() depends on this completing first,
                 * to prevent the registration of both eDP and LVDS and the
                 * incorrect sharing of the PPS.
                 */
                intel_lvds_init(dev_priv);
                intel_crt_init(dev_priv);

                dpd_is_edp = intel_dp_is_port_edp(dev_priv, PORT_D);

                if (ilk_has_edp_a(dev_priv))
                        intel_dp_init(dev_priv, DP_A, PORT_A);

                if (intel_de_read(dev_priv, PCH_HDMIB) & SDVO_DETECTED) {
                        /* PCH SDVOB multiplex with HDMIB */
                        found = intel_sdvo_init(dev_priv, PCH_SDVOB, PORT_B);
                        if (!found)
                                intel_hdmi_init(dev_priv, PCH_HDMIB, PORT_B);
                        if (!found && (intel_de_read(dev_priv, PCH_DP_B) & DP_DETECTED))
                                intel_dp_init(dev_priv, PCH_DP_B, PORT_B);
                }

                if (intel_de_read(dev_priv, PCH_HDMIC) & SDVO_DETECTED)
                        intel_hdmi_init(dev_priv, PCH_HDMIC, PORT_C);

                if (!dpd_is_edp && intel_de_read(dev_priv, PCH_HDMID) & SDVO_DETECTED)
                        intel_hdmi_init(dev_priv, PCH_HDMID, PORT_D);

                if (intel_de_read(dev_priv, PCH_DP_C) & DP_DETECTED)
                        intel_dp_init(dev_priv, PCH_DP_C, PORT_C);

                if (intel_de_read(dev_priv, PCH_DP_D) & DP_DETECTED)
                        intel_dp_init(dev_priv, PCH_DP_D, PORT_D);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                bool has_edp, has_port;

                if (IS_VALLEYVIEW(dev_priv) && dev_priv->vbt.int_crt_support)
                        intel_crt_init(dev_priv);

                /*
                 * The DP_DETECTED bit is the latched state of the DDC
                 * SDA pin at boot. However since eDP doesn't require DDC
                 * (no way to plug in a DP->HDMI dongle) the DDC pins for
                 * eDP ports may have been muxed to an alternate function.
                 * Thus we can't rely on the DP_DETECTED bit alone to detect
                 * eDP ports. Consult the VBT as well as DP_DETECTED to
                 * detect eDP ports.
                 *
                 * Sadly the straps seem to be missing sometimes even for HDMI
                 * ports (eg. on Voyo V3 - CHT x7-Z8700), so check both strap
                 * and VBT for the presence of the port. Additionally we can't
                 * trust the port type the VBT declares as we've seen at least
                 * HDMI ports that the VBT claim are DP or eDP.
                 */
                has_edp = intel_dp_is_port_edp(dev_priv, PORT_B);
                has_port = intel_bios_is_port_present(dev_priv, PORT_B);
                if (intel_de_read(dev_priv, VLV_DP_B) & DP_DETECTED || has_port)
                        has_edp &= intel_dp_init(dev_priv, VLV_DP_B, PORT_B);
                if ((intel_de_read(dev_priv, VLV_HDMIB) & SDVO_DETECTED || has_port) && !has_edp)
                        intel_hdmi_init(dev_priv, VLV_HDMIB, PORT_B);

                has_edp = intel_dp_is_port_edp(dev_priv, PORT_C);
                has_port = intel_bios_is_port_present(dev_priv, PORT_C);
                if (intel_de_read(dev_priv, VLV_DP_C) & DP_DETECTED || has_port)
                        has_edp &= intel_dp_init(dev_priv, VLV_DP_C, PORT_C);
                if ((intel_de_read(dev_priv, VLV_HDMIC) & SDVO_DETECTED || has_port) && !has_edp)
                        intel_hdmi_init(dev_priv, VLV_HDMIC, PORT_C);

                if (IS_CHERRYVIEW(dev_priv)) {
                        /*
                         * eDP not supported on port D,
                         * so no need to worry about it
                         */
                        has_port = intel_bios_is_port_present(dev_priv, PORT_D);
                        if (intel_de_read(dev_priv, CHV_DP_D) & DP_DETECTED || has_port)
                                intel_dp_init(dev_priv, CHV_DP_D, PORT_D);
                        if (intel_de_read(dev_priv, CHV_HDMID) & SDVO_DETECTED || has_port)
                                intel_hdmi_init(dev_priv, CHV_HDMID, PORT_D);
                }

                vlv_dsi_init(dev_priv);
        } else if (IS_PINEVIEW(dev_priv)) {
                intel_lvds_init(dev_priv);
                intel_crt_init(dev_priv);
        } else if (IS_GEN_RANGE(dev_priv, 3, 4)) {
                bool found = false;

                if (IS_MOBILE(dev_priv))
                        intel_lvds_init(dev_priv);

                intel_crt_init(dev_priv);

                if (intel_de_read(dev_priv, GEN3_SDVOB) & SDVO_DETECTED) {
                        drm_dbg_kms(&dev_priv->drm, "probing SDVOB\n");
                        found = intel_sdvo_init(dev_priv, GEN3_SDVOB, PORT_B);
                        if (!found && IS_G4X(dev_priv)) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "probing HDMI on SDVOB\n");
                                intel_hdmi_init(dev_priv, GEN4_HDMIB, PORT_B);
                        }

                        if (!found && IS_G4X(dev_priv))
                                intel_dp_init(dev_priv, DP_B, PORT_B);
                }

                /* Before G4X SDVOC doesn't have its own detect register */

                if (intel_de_read(dev_priv, GEN3_SDVOB) & SDVO_DETECTED) {
                        drm_dbg_kms(&dev_priv->drm, "probing SDVOC\n");
                        found = intel_sdvo_init(dev_priv, GEN3_SDVOC, PORT_C);
                }

                if (!found && (intel_de_read(dev_priv, GEN3_SDVOC) & SDVO_DETECTED)) {

                        if (IS_G4X(dev_priv)) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "probing HDMI on SDVOC\n");
                                intel_hdmi_init(dev_priv, GEN4_HDMIC, PORT_C);
                        }
                        if (IS_G4X(dev_priv))
                                intel_dp_init(dev_priv, DP_C, PORT_C);
                }

                if (IS_G4X(dev_priv) && (intel_de_read(dev_priv, DP_D) & DP_DETECTED))
                        intel_dp_init(dev_priv, DP_D, PORT_D);

                if (SUPPORTS_TV(dev_priv))
                        intel_tv_init(dev_priv);
        } else if (IS_GEN(dev_priv, 2)) {
                if (IS_I85X(dev_priv))
                        intel_lvds_init(dev_priv);

                intel_crt_init(dev_priv);
                intel_dvo_init(dev_priv);
        }

        intel_psr_init(dev_priv);

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                encoder->base.possible_crtcs =
                        intel_encoder_possible_crtcs(encoder);
                encoder->base.possible_clones =
                        intel_encoder_possible_clones(encoder);
        }

        intel_init_pch_refclk(dev_priv);

        drm_helper_move_panel_connectors_to_head(&dev_priv->drm);
}

static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);

        drm_framebuffer_cleanup(fb);
        intel_frontbuffer_put(intel_fb->frontbuffer);

        kfree(intel_fb);
}

static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
                                                struct drm_file *file,
                                                unsigned int *handle)
{
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        struct drm_i915_private *i915 = to_i915(obj->base.dev);

        if (obj->userptr.mm) {
                drm_dbg(&i915->drm,
                        "attempting to use a userptr for a framebuffer, denied\n");
                return -EINVAL;
        }

        return drm_gem_handle_create(file, &obj->base, handle);
}

static int intel_user_framebuffer_dirty(struct drm_framebuffer *fb,
                                        struct drm_file *file,
                                        unsigned flags, unsigned color,
                                        struct drm_clip_rect *clips,
                                        unsigned num_clips)
{
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);

        i915_gem_object_flush_if_display(obj);
        intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);

        return 0;
}

static const struct drm_framebuffer_funcs intel_fb_funcs = {
        .destroy = intel_user_framebuffer_destroy,
        .create_handle = intel_user_framebuffer_create_handle,
        .dirty = intel_user_framebuffer_dirty,
};

static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
                                  struct drm_i915_gem_object *obj,
                                  struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
        struct drm_framebuffer *fb = &intel_fb->base;
        u32 max_stride;
        unsigned int tiling, stride;
        int ret = -EINVAL;
        int i;

        intel_fb->frontbuffer = intel_frontbuffer_get(obj);
        if (!intel_fb->frontbuffer)
                return -ENOMEM;

        i915_gem_object_lock(obj);
        tiling = i915_gem_object_get_tiling(obj);
        stride = i915_gem_object_get_stride(obj);
        i915_gem_object_unlock(obj);

        if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
                /*
                 * If there's a fence, enforce that
                 * the fb modifier and tiling mode match.
                 */
                if (tiling != I915_TILING_NONE &&
                    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "tiling_mode doesn't match fb modifier\n");
                        goto err;
                }
        } else {
                if (tiling == I915_TILING_X) {
                        mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
                } else if (tiling == I915_TILING_Y) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "No Y tiling for legacy addfb\n");
                        goto err;
                }
        }

        if (!drm_any_plane_has_format(&dev_priv->drm,
                                      mode_cmd->pixel_format,
                                      mode_cmd->modifier[0])) {
                struct drm_format_name_buf format_name;

                drm_dbg_kms(&dev_priv->drm,
                            "unsupported pixel format %s / modifier 0x%llx\n",
                            drm_get_format_name(mode_cmd->pixel_format,
                                                &format_name),
                            mode_cmd->modifier[0]);
                goto err;
        }

        /*
         * gen2/3 display engine uses the fence if present,
         * so the tiling mode must match the fb modifier exactly.
         */
        if (INTEL_GEN(dev_priv) < 4 &&
            tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
                drm_dbg_kms(&dev_priv->drm,
                            "tiling_mode must match fb modifier exactly on gen2/3\n");
                goto err;
        }

        max_stride = intel_fb_max_stride(dev_priv, mode_cmd->pixel_format,
                                         mode_cmd->modifier[0]);
        if (mode_cmd->pitches[0] > max_stride) {
                drm_dbg_kms(&dev_priv->drm,
                            "%s pitch (%u) must be at most %d\n",
                            mode_cmd->modifier[0] != DRM_FORMAT_MOD_LINEAR ?
                            "tiled" : "linear",
                            mode_cmd->pitches[0], max_stride);
                goto err;
        }

        /*
         * If there's a fence, enforce that
         * the fb pitch and fence stride match.
         */
        if (tiling != I915_TILING_NONE && mode_cmd->pitches[0] != stride) {
                drm_dbg_kms(&dev_priv->drm,
                            "pitch (%d) must match tiling stride (%d)\n",
                            mode_cmd->pitches[0], stride);
                goto err;
        }

        /* FIXME need to adjust LINOFF/TILEOFF accordingly. */
        if (mode_cmd->offsets[0] != 0) {
                drm_dbg_kms(&dev_priv->drm,
                            "plane 0 offset (0x%08x) must be 0\n",
                            mode_cmd->offsets[0]);
                goto err;
        }

        drm_helper_mode_fill_fb_struct(&dev_priv->drm, fb, mode_cmd);

        for (i = 0; i < fb->format->num_planes; i++) {
                u32 stride_alignment;

                if (mode_cmd->handles[i] != mode_cmd->handles[0]) {
                        drm_dbg_kms(&dev_priv->drm, "bad plane %d handle\n",
                                    i);
                        goto err;
                }

                stride_alignment = intel_fb_stride_alignment(fb, i);
                if (fb->pitches[i] & (stride_alignment - 1)) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "plane %d pitch (%d) must be at least %u byte aligned\n",
                                    i, fb->pitches[i], stride_alignment);
                        goto err;
                }

                if (is_gen12_ccs_plane(fb, i)) {
                        int ccs_aux_stride = gen12_ccs_aux_stride(fb, i);

                        if (fb->pitches[i] != ccs_aux_stride) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "ccs aux plane %d pitch (%d) must be %d\n",
                                            i,
                                            fb->pitches[i], ccs_aux_stride);
                                goto err;
                        }
                }

                fb->obj[i] = &obj->base;
        }

        ret = intel_fill_fb_info(dev_priv, fb);
        if (ret)
                goto err;

        ret = drm_framebuffer_init(&dev_priv->drm, fb, &intel_fb_funcs);
        if (ret) {
                drm_err(&dev_priv->drm, "framebuffer init failed %d\n", ret);
                goto err;
        }

        return 0;

err:
        intel_frontbuffer_put(intel_fb->frontbuffer);
        return ret;
}

static struct drm_framebuffer *
intel_user_framebuffer_create(struct drm_device *dev,
                              struct drm_file *filp,
                              const struct drm_mode_fb_cmd2 *user_mode_cmd)
{
        struct drm_framebuffer *fb;
        struct drm_i915_gem_object *obj;
        struct drm_mode_fb_cmd2 mode_cmd = *user_mode_cmd;

        obj = i915_gem_object_lookup(filp, mode_cmd.handles[0]);
        if (!obj)
                return ERR_PTR(-ENOENT);

        fb = intel_framebuffer_create(obj, &mode_cmd);
        i915_gem_object_put(obj);

        return fb;
}

static enum drm_mode_status
intel_mode_valid(struct drm_device *dev,
                 const struct drm_display_mode *mode)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int hdisplay_max, htotal_max;
        int vdisplay_max, vtotal_max;

        /*
         * Can't reject DBLSCAN here because Xorg ddxen can add piles
         * of DBLSCAN modes to the output's mode list when they detect
         * the scaling mode property on the connector. And they don't
         * ask the kernel to validate those modes in any way until
         * modeset time at which point the client gets a protocol error.
         * So in order to not upset those clients we silently ignore the
         * DBLSCAN flag on such connectors. For other connectors we will
         * reject modes with the DBLSCAN flag in encoder->compute_config().
         * And we always reject DBLSCAN modes in connector->mode_valid()
         * as we never want such modes on the connector's mode list.
         */

        if (mode->vscan > 1)
                return MODE_NO_VSCAN;

        if (mode->flags & DRM_MODE_FLAG_HSKEW)
                return MODE_H_ILLEGAL;

        if (mode->flags & (DRM_MODE_FLAG_CSYNC |
                           DRM_MODE_FLAG_NCSYNC |
                           DRM_MODE_FLAG_PCSYNC))
                return MODE_HSYNC;

        if (mode->flags & (DRM_MODE_FLAG_BCAST |
                           DRM_MODE_FLAG_PIXMUX |
                           DRM_MODE_FLAG_CLKDIV2))
                return MODE_BAD;

        /* Transcoder timing limits */
        if (INTEL_GEN(dev_priv) >= 11) {
                hdisplay_max = 16384;
                vdisplay_max = 8192;
                htotal_max = 16384;
                vtotal_max = 8192;
        } else if (INTEL_GEN(dev_priv) >= 9 ||
                   IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                hdisplay_max = 8192; /* FDI max 4096 handled elsewhere */
                vdisplay_max = 4096;
                htotal_max = 8192;
                vtotal_max = 8192;
        } else if (INTEL_GEN(dev_priv) >= 3) {
                hdisplay_max = 4096;
                vdisplay_max = 4096;
                htotal_max = 8192;
                vtotal_max = 8192;
        } else {
                hdisplay_max = 2048;
                vdisplay_max = 2048;
                htotal_max = 4096;
                vtotal_max = 4096;
        }

        if (mode->hdisplay > hdisplay_max ||
            mode->hsync_start > htotal_max ||
            mode->hsync_end > htotal_max ||
            mode->htotal > htotal_max)
                return MODE_H_ILLEGAL;

        if (mode->vdisplay > vdisplay_max ||
            mode->vsync_start > vtotal_max ||
            mode->vsync_end > vtotal_max ||
            mode->vtotal > vtotal_max)
                return MODE_V_ILLEGAL;

        if (INTEL_GEN(dev_priv) >= 5) {
                if (mode->hdisplay < 64 ||
                    mode->htotal - mode->hdisplay < 32)
                        return MODE_H_ILLEGAL;

                if (mode->vtotal - mode->vdisplay < 5)
                        return MODE_V_ILLEGAL;
        } else {
                if (mode->htotal - mode->hdisplay < 32)
                        return MODE_H_ILLEGAL;

                if (mode->vtotal - mode->vdisplay < 3)
                        return MODE_V_ILLEGAL;
        }

        return MODE_OK;
}

enum drm_mode_status
intel_mode_valid_max_plane_size(struct drm_i915_private *dev_priv,
                                const struct drm_display_mode *mode)
{
        int plane_width_max, plane_height_max;

        /*
         * intel_mode_valid() should be
         * sufficient on older platforms.
         */
        if (INTEL_GEN(dev_priv) < 9)
                return MODE_OK;

        /*
         * Most people will probably want a fullscreen
         * plane so let's not advertize modes that are
         * too big for that.
         */
        if (INTEL_GEN(dev_priv) >= 11) {
                plane_width_max = 5120;
                plane_height_max = 4320;
        } else {
                plane_width_max = 5120;
                plane_height_max = 4096;
        }

        if (mode->hdisplay > plane_width_max)
                return MODE_H_ILLEGAL;

        if (mode->vdisplay > plane_height_max)
                return MODE_V_ILLEGAL;

        return MODE_OK;
}

static const struct drm_mode_config_funcs intel_mode_funcs = {
        .fb_create = intel_user_framebuffer_create,
        .get_format_info = intel_get_format_info,
        .output_poll_changed = intel_fbdev_output_poll_changed,
        .mode_valid = intel_mode_valid,
        .atomic_check = intel_atomic_check,
        .atomic_commit = intel_atomic_commit,
        .atomic_state_alloc = intel_atomic_state_alloc,
        .atomic_state_clear = intel_atomic_state_clear,
        .atomic_state_free = intel_atomic_state_free,
};

/**
 * intel_init_display_hooks - initialize the display modesetting hooks
 * @dev_priv: device private
 */
void intel_init_display_hooks(struct drm_i915_private *dev_priv)
{
        intel_init_cdclk_hooks(dev_priv);

        if (INTEL_GEN(dev_priv) >= 9) {
                dev_priv->display.get_pipe_config = hsw_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        skl_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = hsw_crtc_compute_clock;
                dev_priv->display.crtc_enable = hsw_crtc_enable;
                dev_priv->display.crtc_disable = hsw_crtc_disable;
        } else if (HAS_DDI(dev_priv)) {
                dev_priv->display.get_pipe_config = hsw_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock =
                        hsw_crtc_compute_clock;
                dev_priv->display.crtc_enable = hsw_crtc_enable;
                dev_priv->display.crtc_disable = hsw_crtc_disable;
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                dev_priv->display.get_pipe_config = ilk_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock =
                        ilk_crtc_compute_clock;
                dev_priv->display.crtc_enable = ilk_crtc_enable;
                dev_priv->display.crtc_disable = ilk_crtc_disable;
        } else if (IS_CHERRYVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = chv_crtc_compute_clock;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (IS_VALLEYVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = vlv_crtc_compute_clock;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (IS_G4X(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = g4x_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (IS_PINEVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = pnv_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (!IS_GEN(dev_priv, 2)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = i9xx_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = i8xx_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        }

        if (IS_GEN(dev_priv, 5)) {
                dev_priv->display.fdi_link_train = ilk_fdi_link_train;
        } else if (IS_GEN(dev_priv, 6)) {
                dev_priv->display.fdi_link_train = gen6_fdi_link_train;
        } else if (IS_IVYBRIDGE(dev_priv)) {
                /* FIXME: detect B0+ stepping and use auto training */
                dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train;
        }

        if (INTEL_GEN(dev_priv) >= 9)
                dev_priv->display.commit_modeset_enables = skl_commit_modeset_enables;
        else
                dev_priv->display.commit_modeset_enables = intel_commit_modeset_enables;

}

void intel_modeset_init_hw(struct drm_i915_private *i915)
{
        struct intel_cdclk_state *cdclk_state =
                to_intel_cdclk_state(i915->cdclk.obj.state);
        struct intel_dbuf_state *dbuf_state =
                to_intel_dbuf_state(i915->dbuf.obj.state);

        intel_update_cdclk(i915);
        intel_dump_cdclk_config(&i915->cdclk.hw, "Current CDCLK");
        cdclk_state->logical = cdclk_state->actual = i915->cdclk.hw;

        dbuf_state->enabled_slices = i915->dbuf.enabled_slices;
}

static int sanitize_watermarks_add_affected(struct drm_atomic_state *state)
{
        struct drm_plane *plane;
        struct intel_crtc *crtc;

        for_each_intel_crtc(state->dev, crtc) {
                struct intel_crtc_state *crtc_state;

                crtc_state = intel_atomic_get_crtc_state(state, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                if (crtc_state->hw.active) {
                        /*
                         * Preserve the inherited flag to avoid
                         * taking the full modeset path.
                         */
                        crtc_state->inherited = true;
                }
        }

        drm_for_each_plane(plane, state->dev) {
                struct drm_plane_state *plane_state;

                plane_state = drm_atomic_get_plane_state(state, plane);
                if (IS_ERR(plane_state))
                        return PTR_ERR(plane_state);
        }

        return 0;
}

/*
 * Calculate what we think the watermarks should be for the state we've read
 * out of the hardware and then immediately program those watermarks so that
 * we ensure the hardware settings match our internal state.
 *
 * We can calculate what we think WM's should be by creating a duplicate of the
 * current state (which was constructed during hardware readout) and running it
 * through the atomic check code to calculate new watermark values in the
 * state object.
 */
static void sanitize_watermarks(struct drm_i915_private *dev_priv)
{
        struct drm_atomic_state *state;
        struct intel_atomic_state *intel_state;
        struct intel_crtc *crtc;
        struct intel_crtc_state *crtc_state;
        struct drm_modeset_acquire_ctx ctx;
        int ret;
        int i;

        /* Only supported on platforms that use atomic watermark design */
        if (!dev_priv->display.optimize_watermarks)
                return;

        state = drm_atomic_state_alloc(&dev_priv->drm);
        if (drm_WARN_ON(&dev_priv->drm, !state))
                return;

        intel_state = to_intel_atomic_state(state);

        drm_modeset_acquire_init(&ctx, 0);

retry:
        state->acquire_ctx = &ctx;

        /*
         * Hardware readout is the only time we don't want to calculate
         * intermediate watermarks (since we don't trust the current
         * watermarks).
         */
        if (!HAS_GMCH(dev_priv))
                intel_state->skip_intermediate_wm = true;

        ret = sanitize_watermarks_add_affected(state);
        if (ret)
                goto fail;

        ret = intel_atomic_check(&dev_priv->drm, state);
        if (ret)
                goto fail;

        /* Write calculated watermark values back */
        for_each_new_intel_crtc_in_state(intel_state, crtc, crtc_state, i) {
                crtc_state->wm.need_postvbl_update = true;
                dev_priv->display.optimize_watermarks(intel_state, crtc);

                to_intel_crtc_state(crtc->base.state)->wm = crtc_state->wm;
        }

fail:
        if (ret == -EDEADLK) {
                drm_atomic_state_clear(state);
                drm_modeset_backoff(&ctx);
                goto retry;
        }

        /*
         * If we fail here, it means that the hardware appears to be
         * programmed in a way that shouldn't be possible, given our
         * understanding of watermark requirements.  This might mean a
         * mistake in the hardware readout code or a mistake in the
         * watermark calculations for a given platform.  Raise a WARN
         * so that this is noticeable.
         *
         * If this actually happens, we'll have to just leave the
         * BIOS-programmed watermarks untouched and hope for the best.
         */
        drm_WARN(&dev_priv->drm, ret,
                 "Could not determine valid watermarks for inherited state\n");

        drm_atomic_state_put(state);

        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);
}

static void intel_update_fdi_pll_freq(struct drm_i915_private *dev_priv)
{
        if (IS_GEN(dev_priv, 5)) {
                u32 fdi_pll_clk =
                        intel_de_read(dev_priv, FDI_PLL_BIOS_0) & FDI_PLL_FB_CLOCK_MASK;

                dev_priv->fdi_pll_freq = (fdi_pll_clk + 2) * 10000;
        } else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv)) {
                dev_priv->fdi_pll_freq = 270000;
        } else {
                return;
        }

        drm_dbg(&dev_priv->drm, "FDI PLL freq=%d\n", dev_priv->fdi_pll_freq);
}

static int intel_initial_commit(struct drm_device *dev)
{
        struct drm_atomic_state *state = NULL;
        struct drm_modeset_acquire_ctx ctx;
        struct intel_crtc *crtc;
        int ret = 0;

        state = drm_atomic_state_alloc(dev);
        if (!state)
                return -ENOMEM;

        drm_modeset_acquire_init(&ctx, 0);

retry:
        state->acquire_ctx = &ctx;

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        intel_atomic_get_crtc_state(state, crtc);

                if (IS_ERR(crtc_state)) {
                        ret = PTR_ERR(crtc_state);
                        goto out;
                }

                if (crtc_state->hw.active) {
                        /*
                         * We've not yet detected sink capabilities
                         * (audio,infoframes,etc.) and thus we don't want to
                         * force a full state recomputation yet. We want that to
                         * happen only for the first real commit from userspace.
                         * So preserve the inherited flag for the time being.
                         */
                        crtc_state->inherited = true;

                        ret = drm_atomic_add_affected_planes(state, &crtc->base);
                        if (ret)
                                goto out;

                        /*
                         * FIXME hack to force a LUT update to avoid the
                         * plane update forcing the pipe gamma on without
                         * having a proper LUT loaded. Remove once we
                         * have readout for pipe gamma enable.
                         */
                        crtc_state->uapi.color_mgmt_changed = true;

                        /*
                         * FIXME hack to force full modeset when DSC is being
                         * used.
                         *
                         * As long as we do not have full state readout and
                         * config comparison of crtc_state->dsc, we have no way
                         * to ensure reliable fastset. Remove once we have
                         * readout for DSC.
                         */
                        if (crtc_state->dsc.compression_enable) {
                                ret = drm_atomic_add_affected_connectors(state,
                                                                         &crtc->base);
                                if (ret)
                                        goto out;
                                crtc_state->uapi.mode_changed = true;
                                drm_dbg_kms(dev, "Force full modeset for DSC\n");
                        }
                }
        }

        ret = drm_atomic_commit(state);

out:
        if (ret == -EDEADLK) {
                drm_atomic_state_clear(state);
                drm_modeset_backoff(&ctx);
                goto retry;
        }

        drm_atomic_state_put(state);

        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        return ret;
}

static void intel_mode_config_init(struct drm_i915_private *i915)
{
        struct drm_mode_config *mode_config = &i915->drm.mode_config;

        drm_mode_config_init(&i915->drm);
        INIT_LIST_HEAD(&i915->global_obj_list);

        mode_config->min_width = 0;
        mode_config->min_height = 0;

        mode_config->preferred_depth = 24;
        mode_config->prefer_shadow = 1;

        mode_config->allow_fb_modifiers = true;

        mode_config->funcs = &intel_mode_funcs;

        /*
         * Maximum framebuffer dimensions, chosen to match
         * the maximum render engine surface size on gen4+.
         */
        if (INTEL_GEN(i915) >= 7) {
                mode_config->max_width = 16384;
                mode_config->max_height = 16384;
        } else if (INTEL_GEN(i915) >= 4) {
                mode_config->max_width = 8192;
                mode_config->max_height = 8192;
        } else if (IS_GEN(i915, 3)) {
                mode_config->max_width = 4096;
                mode_config->max_height = 4096;
        } else {
                mode_config->max_width = 2048;
                mode_config->max_height = 2048;
        }

        if (IS_I845G(i915) || IS_I865G(i915)) {
                mode_config->cursor_width = IS_I845G(i915) ? 64 : 512;
                mode_config->cursor_height = 1023;
        } else if (IS_I830(i915) || IS_I85X(i915) ||
                   IS_I915G(i915) || IS_I915GM(i915)) {
                mode_config->cursor_width = 64;
                mode_config->cursor_height = 64;
        } else {
                mode_config->cursor_width = 256;
                mode_config->cursor_height = 256;
        }
}

static void intel_mode_config_cleanup(struct drm_i915_private *i915)
{
        intel_atomic_global_obj_cleanup(i915);
        drm_mode_config_cleanup(&i915->drm);
}

static void plane_config_fini(struct intel_initial_plane_config *plane_config)
{
        if (plane_config->fb) {
                struct drm_framebuffer *fb = &plane_config->fb->base;

                /* We may only have the stub and not a full framebuffer */
                if (drm_framebuffer_read_refcount(fb))
                        drm_framebuffer_put(fb);
                else
                        kfree(fb);
        }

        if (plane_config->vma)
                i915_vma_put(plane_config->vma);
}

/* part #1: call before irq install */
int intel_modeset_init_noirq(struct drm_i915_private *i915)
{
        int ret;

        i915->modeset_wq = alloc_ordered_workqueue("i915_modeset", 0);
        i915->flip_wq = alloc_workqueue("i915_flip", WQ_HIGHPRI |
                                        WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);

        intel_mode_config_init(i915);

        ret = intel_cdclk_init(i915);
        if (ret)
                return ret;

        ret = intel_dbuf_init(i915);
        if (ret)
                return ret;

        ret = intel_bw_init(i915);
        if (ret)
                return ret;

        init_llist_head(&i915->atomic_helper.free_list);
        INIT_WORK(&i915->atomic_helper.free_work,
                  intel_atomic_helper_free_state_worker);

        intel_init_quirks(i915);

        intel_fbc_init(i915);

        return 0;
}

/* part #2: call after irq install */
int intel_modeset_init(struct drm_i915_private *i915)
{
        struct drm_device *dev = &i915->drm;
        enum pipe pipe;
        struct intel_crtc *crtc;
        int ret;

        intel_init_pm(i915);

        intel_panel_sanitize_ssc(i915);

        intel_gmbus_setup(i915);

        drm_dbg_kms(&i915->drm, "%d display pipe%s available.\n",
                    INTEL_NUM_PIPES(i915),
                    INTEL_NUM_PIPES(i915) > 1 ? "s" : "");

        if (HAS_DISPLAY(i915) && INTEL_DISPLAY_ENABLED(i915)) {
                for_each_pipe(i915, pipe) {
                        ret = intel_crtc_init(i915, pipe);
                        if (ret) {
                                intel_mode_config_cleanup(i915);
                                return ret;
                        }
                }
        }

        intel_plane_possible_crtcs_init(i915);
        intel_shared_dpll_init(dev);
        intel_update_fdi_pll_freq(i915);

        intel_update_czclk(i915);
        intel_modeset_init_hw(i915);

        intel_hdcp_component_init(i915);

        if (i915->max_cdclk_freq == 0)
                intel_update_max_cdclk(i915);

        /* Just disable it once at startup */
        intel_vga_disable(i915);
        intel_setup_outputs(i915);

        drm_modeset_lock_all(dev);
        intel_modeset_setup_hw_state(dev, dev->mode_config.acquire_ctx);
        drm_modeset_unlock_all(dev);

        for_each_intel_crtc(dev, crtc) {
                struct intel_initial_plane_config plane_config = {};

                if (!crtc->active)
                        continue;

                /*
                 * Note that reserving the BIOS fb up front prevents us
                 * from stuffing other stolen allocations like the ring
                 * on top.  This prevents some ugliness at boot time, and
                 * can even allow for smooth boot transitions if the BIOS
                 * fb is large enough for the active pipe configuration.
                 */
                i915->display.get_initial_plane_config(crtc, &plane_config);

                /*
                 * If the fb is shared between multiple heads, we'll
                 * just get the first one.
                 */
                intel_find_initial_plane_obj(crtc, &plane_config);

                plane_config_fini(&plane_config);
        }

        /*
         * Make sure hardware watermarks really match the state we read out.
         * Note that we need to do this after reconstructing the BIOS fb's
         * since the watermark calculation done here will use pstate->fb.
         */
        if (!HAS_GMCH(i915))
                sanitize_watermarks(i915);

        /*
         * Force all active planes to recompute their states. So that on
         * mode_setcrtc after probe, all the intel_plane_state variables
         * are already calculated and there is no assert_plane warnings
         * during bootup.
         */
        ret = intel_initial_commit(dev);
        if (ret)
                drm_dbg_kms(&i915->drm, "Initial commit in probe failed.\n");

        return 0;
}

void i830_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
        /* 640x480@60Hz, ~25175 kHz */
        struct dpll clock = {
                .m1 = 18,
                .m2 = 7,
                .p1 = 13,
                .p2 = 4,
                .n = 2,
        };
        u32 dpll, fp;
        int i;

        drm_WARN_ON(&dev_priv->drm,
                    i9xx_calc_dpll_params(48000, &clock) != 25154);

        drm_dbg_kms(&dev_priv->drm,
                    "enabling pipe %c due to force quirk (vco=%d dot=%d)\n",
                    pipe_name(pipe), clock.vco, clock.dot);

        fp = i9xx_dpll_compute_fp(&clock);
        dpll = DPLL_DVO_2X_MODE |
                DPLL_VGA_MODE_DIS |
                ((clock.p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT) |
                PLL_P2_DIVIDE_BY_4 |
                PLL_REF_INPUT_DREFCLK |
                DPLL_VCO_ENABLE;

        intel_de_write(dev_priv, FP0(pipe), fp);
        intel_de_write(dev_priv, FP1(pipe), fp);

        intel_de_write(dev_priv, HTOTAL(pipe), (640 - 1) | ((800 - 1) << 16));
        intel_de_write(dev_priv, HBLANK(pipe), (640 - 1) | ((800 - 1) << 16));
        intel_de_write(dev_priv, HSYNC(pipe), (656 - 1) | ((752 - 1) << 16));
        intel_de_write(dev_priv, VTOTAL(pipe), (480 - 1) | ((525 - 1) << 16));
        intel_de_write(dev_priv, VBLANK(pipe), (480 - 1) | ((525 - 1) << 16));
        intel_de_write(dev_priv, VSYNC(pipe), (490 - 1) | ((492 - 1) << 16));
        intel_de_write(dev_priv, PIPESRC(pipe), ((640 - 1) << 16) | (480 - 1));

        /*
         * Apparently we need to have VGA mode enabled prior to changing
         * the P1/P2 dividers. Otherwise the DPLL will keep using the old
         * dividers, even though the register value does change.
         */
        intel_de_write(dev_priv, DPLL(pipe), dpll & ~DPLL_VGA_MODE_DIS);
        intel_de_write(dev_priv, DPLL(pipe), dpll);

        /* Wait for the clocks to stabilize. */
        intel_de_posting_read(dev_priv, DPLL(pipe));
        udelay(150);

        /* The pixel multiplier can only be updated once the
         * DPLL is enabled and the clocks are stable.
         *
         * So write it again.
         */
        intel_de_write(dev_priv, DPLL(pipe), dpll);

        /* We do this three times for luck */
        for (i = 0; i < 3 ; i++) {
                intel_de_write(dev_priv, DPLL(pipe), dpll);
                intel_de_posting_read(dev_priv, DPLL(pipe));
                udelay(150); /* wait for warmup */
        }

        intel_de_write(dev_priv, PIPECONF(pipe),
                       PIPECONF_ENABLE | PIPECONF_PROGRESSIVE);
        intel_de_posting_read(dev_priv, PIPECONF(pipe));

        intel_wait_for_pipe_scanline_moving(crtc);
}

void i830_disable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        drm_dbg_kms(&dev_priv->drm, "disabling pipe %c due to force quirk\n",
                    pipe_name(pipe));

        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, DSPCNTR(PLANE_A)) &
                    DISPLAY_PLANE_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, DSPCNTR(PLANE_B)) &
                    DISPLAY_PLANE_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, DSPCNTR(PLANE_C)) &
                    DISPLAY_PLANE_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, CURCNTR(PIPE_A)) & MCURSOR_MODE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, CURCNTR(PIPE_B)) & MCURSOR_MODE);

        intel_de_write(dev_priv, PIPECONF(pipe), 0);
        intel_de_posting_read(dev_priv, PIPECONF(pipe));

        intel_wait_for_pipe_scanline_stopped(crtc);

        intel_de_write(dev_priv, DPLL(pipe), DPLL_VGA_MODE_DIS);
        intel_de_posting_read(dev_priv, DPLL(pipe));
}

static void
intel_sanitize_plane_mapping(struct drm_i915_private *dev_priv)
{
        struct intel_crtc *crtc;

        if (INTEL_GEN(dev_priv) >= 4)
                return;

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_plane *plane =
                        to_intel_plane(crtc->base.primary);
                struct intel_crtc *plane_crtc;
                enum pipe pipe;

                if (!plane->get_hw_state(plane, &pipe))
                        continue;

                if (pipe == crtc->pipe)
                        continue;

                drm_dbg_kms(&dev_priv->drm,
                            "[PLANE:%d:%s] attached to the wrong pipe, disabling plane\n",
                            plane->base.base.id, plane->base.name);

                plane_crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                intel_plane_disable_noatomic(plane_crtc, plane);
        }
}

static bool intel_crtc_has_encoders(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_encoder *encoder;

        for_each_encoder_on_crtc(dev, &crtc->base, encoder)
                return true;

        return false;
}

static struct intel_connector *intel_encoder_find_connector(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_connector *connector;

        for_each_connector_on_encoder(dev, &encoder->base, connector)
                return connector;

        return NULL;
}

static bool has_pch_trancoder(struct drm_i915_private *dev_priv,
                              enum pipe pch_transcoder)
{
        return HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv) ||
                (HAS_PCH_LPT_H(dev_priv) && pch_transcoder == PIPE_A);
}

static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        if (INTEL_GEN(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                i915_reg_t reg = CHICKEN_TRANS(cpu_transcoder);
                u32 val;

                if (transcoder_is_dsi(cpu_transcoder))
                        return;

                val = intel_de_read(dev_priv, reg);
                val &= ~HSW_FRAME_START_DELAY_MASK;
                val |= HSW_FRAME_START_DELAY(0);
                intel_de_write(dev_priv, reg, val);
        } else {
                i915_reg_t reg = PIPECONF(cpu_transcoder);
                u32 val;

                val = intel_de_read(dev_priv, reg);
                val &= ~PIPECONF_FRAME_START_DELAY_MASK;
                val |= PIPECONF_FRAME_START_DELAY(0);
                intel_de_write(dev_priv, reg, val);
        }

        if (!crtc_state->has_pch_encoder)
                return;

        if (HAS_PCH_IBX(dev_priv)) {
                i915_reg_t reg = PCH_TRANSCONF(crtc->pipe);
                u32 val;

                val = intel_de_read(dev_priv, reg);
                val &= ~TRANS_FRAME_START_DELAY_MASK;
                val |= TRANS_FRAME_START_DELAY(0);
                intel_de_write(dev_priv, reg, val);
        } else {
                enum pipe pch_transcoder = intel_crtc_pch_transcoder(crtc);
                i915_reg_t reg = TRANS_CHICKEN2(pch_transcoder);
                u32 val;

                val = intel_de_read(dev_priv, reg);
                val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
                val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
                intel_de_write(dev_priv, reg, val);
        }
}

static void intel_sanitize_crtc(struct intel_crtc *crtc,
                                struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *crtc_state = to_intel_crtc_state(crtc->base.state);

        if (crtc_state->hw.active) {
                struct intel_plane *plane;

                /* Clear any frame start delays used for debugging left by the BIOS */
                intel_sanitize_frame_start_delay(crtc_state);

                /* Disable everything but the primary plane */
                for_each_intel_plane_on_crtc(dev, crtc, plane) {
                        const struct intel_plane_state *plane_state =
                                to_intel_plane_state(plane->base.state);

                        if (plane_state->uapi.visible &&
                            plane->base.type != DRM_PLANE_TYPE_PRIMARY)
                                intel_plane_disable_noatomic(crtc, plane);
                }

                /*
                 * Disable any background color set by the BIOS, but enable the
                 * gamma and CSC to match how we program our planes.
                 */
                if (INTEL_GEN(dev_priv) >= 9)
                        intel_de_write(dev_priv, SKL_BOTTOM_COLOR(crtc->pipe),
                                       SKL_BOTTOM_COLOR_GAMMA_ENABLE | SKL_BOTTOM_COLOR_CSC_ENABLE);
        }

        /* Adjust the state of the output pipe according to whether we
         * have active connectors/encoders. */
        if (crtc_state->hw.active && !intel_crtc_has_encoders(crtc))
                intel_crtc_disable_noatomic(crtc, ctx);

        if (crtc_state->hw.active || HAS_GMCH(dev_priv)) {
                /*
                 * We start out with underrun reporting disabled to avoid races.
                 * For correct bookkeeping mark this on active crtcs.
                 *
                 * Also on gmch platforms we dont have any hardware bits to
                 * disable the underrun reporting. Which means we need to start
                 * out with underrun reporting disabled also on inactive pipes,
                 * since otherwise we'll complain about the garbage we read when
                 * e.g. coming up after runtime pm.
                 *
                 * No protection against concurrent access is required - at
                 * worst a fifo underrun happens which also sets this to false.
                 */
                crtc->cpu_fifo_underrun_disabled = true;
                /*
                 * We track the PCH trancoder underrun reporting state
                 * within the crtc. With crtc for pipe A housing the underrun
                 * reporting state for PCH transcoder A, crtc for pipe B housing
                 * it for PCH transcoder B, etc. LPT-H has only PCH transcoder A,
                 * and marking underrun reporting as disabled for the non-existing
                 * PCH transcoders B and C would prevent enabling the south
                 * error interrupt (see cpt_can_enable_serr_int()).
                 */
                if (has_pch_trancoder(dev_priv, crtc->pipe))
                        crtc->pch_fifo_underrun_disabled = true;
        }
}

static bool has_bogus_dpll_config(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        /*
         * Some SNB BIOSen (eg. ASUS K53SV) are known to misprogram
         * the hardware when a high res displays plugged in. DPLL P
         * divider is zero, and the pipe timings are bonkers. We'll
         * try to disable everything in that case.
         *
         * FIXME would be nice to be able to sanitize this state
         * without several WARNs, but for now let's take the easy
         * road.
         */
        return IS_GEN(dev_priv, 6) &&
                crtc_state->hw.active &&
                crtc_state->shared_dpll &&
                crtc_state->port_clock == 0;
}

static void intel_sanitize_encoder(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_connector *connector;
        struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
        struct intel_crtc_state *crtc_state = crtc ?
                to_intel_crtc_state(crtc->base.state) : NULL;

        /* We need to check both for a crtc link (meaning that the
         * encoder is active and trying to read from a pipe) and the
         * pipe itself being active. */
        bool has_active_crtc = crtc_state &&
                crtc_state->hw.active;

        if (crtc_state && has_bogus_dpll_config(crtc_state)) {
                drm_dbg_kms(&dev_priv->drm,
                            "BIOS has misprogrammed the hardware. Disabling pipe %c\n",
                            pipe_name(crtc->pipe));
                has_active_crtc = false;
        }

        connector = intel_encoder_find_connector(encoder);
        if (connector && !has_active_crtc) {
                drm_dbg_kms(&dev_priv->drm,
                            "[ENCODER:%d:%s] has active connectors but no active pipe!\n",
                            encoder->base.base.id,
                            encoder->base.name);

                /* Connector is active, but has no active pipe. This is
                 * fallout from our resume register restoring. Disable
                 * the encoder manually again. */
                if (crtc_state) {
                        struct drm_encoder *best_encoder;

                        drm_dbg_kms(&dev_priv->drm,
                                    "[ENCODER:%d:%s] manually disabled\n",
                                    encoder->base.base.id,
                                    encoder->base.name);

                        /* avoid oopsing in case the hooks consult best_encoder */
                        best_encoder = connector->base.state->best_encoder;
                        connector->base.state->best_encoder = &encoder->base;

                        /* FIXME NULL atomic state passed! */
                        if (encoder->disable)
                                encoder->disable(NULL, encoder, crtc_state,
                                                 connector->base.state);
                        if (encoder->post_disable)
                                encoder->post_disable(NULL, encoder, crtc_state,
                                                      connector->base.state);

                        connector->base.state->best_encoder = best_encoder;
                }
                encoder->base.crtc = NULL;

                /* Inconsistent output/port/pipe state happens presumably due to
                 * a bug in one of the get_hw_state functions. Or someplace else
                 * in our code, like the register restore mess on resume. Clamp
                 * things to off as a safer default. */

                connector->base.dpms = DRM_MODE_DPMS_OFF;
                connector->base.encoder = NULL;
        }

        /* notify opregion of the sanitized encoder state */
        intel_opregion_notify_encoder(encoder, connector && has_active_crtc);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_sanitize_encoder_pll_mapping(encoder);
}

/* FIXME read out full plane state for all planes */
static void readout_plane_state(struct drm_i915_private *dev_priv)
{
        struct intel_plane *plane;
        struct intel_crtc *crtc;

        for_each_intel_plane(&dev_priv->drm, plane) {
                struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);
                struct intel_crtc_state *crtc_state;
                enum pipe pipe = PIPE_A;
                bool visible;

                visible = plane->get_hw_state(plane, &pipe);

                crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                crtc_state = to_intel_crtc_state(crtc->base.state);

                intel_set_plane_visible(crtc_state, plane_state, visible);

                drm_dbg_kms(&dev_priv->drm,
                            "[PLANE:%d:%s] hw state readout: %s, pipe %c\n",
                            plane->base.base.id, plane->base.name,
                            enableddisabled(visible), pipe_name(pipe));
        }

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                fixup_active_planes(crtc_state);
        }
}

static void intel_modeset_readout_hw_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_cdclk_state *cdclk_state =
                to_intel_cdclk_state(dev_priv->cdclk.obj.state);
        struct intel_dbuf_state *dbuf_state =
                to_intel_dbuf_state(dev_priv->dbuf.obj.state);
        enum pipe pipe;
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        u8 active_pipes = 0;

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                __drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
                intel_crtc_free_hw_state(crtc_state);
                intel_crtc_state_reset(crtc_state, crtc);

                crtc_state->hw.active = crtc_state->hw.enable =
                        dev_priv->display.get_pipe_config(crtc, crtc_state);

                crtc->base.enabled = crtc_state->hw.enable;
                crtc->active = crtc_state->hw.active;

                if (crtc_state->hw.active)
                        active_pipes |= BIT(crtc->pipe);

                drm_dbg_kms(&dev_priv->drm,
                            "[CRTC:%d:%s] hw state readout: %s\n",
                            crtc->base.base.id, crtc->base.name,
                            enableddisabled(crtc_state->hw.active));
        }

        dev_priv->active_pipes = cdclk_state->active_pipes =
                dbuf_state->active_pipes = active_pipes;

        readout_plane_state(dev_priv);

        intel_dpll_readout_hw_state(dev_priv);

        for_each_intel_encoder(dev, encoder) {
                pipe = 0;

                if (encoder->get_hw_state(encoder, &pipe)) {
                        struct intel_crtc_state *crtc_state;

                        crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                        crtc_state = to_intel_crtc_state(crtc->base.state);

                        encoder->base.crtc = &crtc->base;
                        encoder->get_config(encoder, crtc_state);
                } else {
                        encoder->base.crtc = NULL;
                }

                drm_dbg_kms(&dev_priv->drm,
                            "[ENCODER:%d:%s] hw state readout: %s, pipe %c\n",
                            encoder->base.base.id, encoder->base.name,
                            enableddisabled(encoder->base.crtc),
                            pipe_name(pipe));
        }

        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->get_hw_state(connector)) {
                        struct intel_crtc_state *crtc_state;
                        struct intel_crtc *crtc;

                        connector->base.dpms = DRM_MODE_DPMS_ON;

                        encoder = intel_attached_encoder(connector);
                        connector->base.encoder = &encoder->base;

                        crtc = to_intel_crtc(encoder->base.crtc);
                        crtc_state = crtc ? to_intel_crtc_state(crtc->base.state) : NULL;

                        if (crtc_state && crtc_state->hw.active) {
                                /*
                                 * This has to be done during hardware readout
                                 * because anything calling .crtc_disable may
                                 * rely on the connector_mask being accurate.
                                 */
                                crtc_state->uapi.connector_mask |=
                                        drm_connector_mask(&connector->base);
                                crtc_state->uapi.encoder_mask |=
                                        drm_encoder_mask(&encoder->base);
                        }
                } else {
                        connector->base.dpms = DRM_MODE_DPMS_OFF;
                        connector->base.encoder = NULL;
                }
                drm_dbg_kms(&dev_priv->drm,
                            "[CONNECTOR:%d:%s] hw state readout: %s\n",
                            connector->base.base.id, connector->base.name,
                            enableddisabled(connector->base.encoder));
        }
        drm_connector_list_iter_end(&conn_iter);

        for_each_intel_crtc(dev, crtc) {
                struct intel_bw_state *bw_state =
                        to_intel_bw_state(dev_priv->bw_obj.state);
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);
                struct intel_plane *plane;
                int min_cdclk = 0;

                if (crtc_state->hw.active) {
                        struct drm_display_mode *mode = &crtc_state->hw.mode;

                        intel_mode_from_pipe_config(&crtc_state->hw.adjusted_mode,
                                                    crtc_state);

                        *mode = crtc_state->hw.adjusted_mode;
                        mode->hdisplay = crtc_state->pipe_src_w;
                        mode->vdisplay = crtc_state->pipe_src_h;

                        /*
                         * The initial mode needs to be set in order to keep
                         * the atomic core happy. It wants a valid mode if the
                         * crtc's enabled, so we do the above call.
                         *
                         * But we don't set all the derived state fully, hence
                         * set a flag to indicate that a full recalculation is
                         * needed on the next commit.
                         */
                        crtc_state->inherited = true;

                        intel_crtc_compute_pixel_rate(crtc_state);

                        intel_crtc_update_active_timings(crtc_state);

                        intel_crtc_copy_hw_to_uapi_state(crtc_state);
                }

                for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                        const struct intel_plane_state *plane_state =
                                to_intel_plane_state(plane->base.state);

                        /*
                         * FIXME don't have the fb yet, so can't
                         * use intel_plane_data_rate() :(
                         */
                        if (plane_state->uapi.visible)
                                crtc_state->data_rate[plane->id] =
                                        4 * crtc_state->pixel_rate;
                        /*
                         * FIXME don't have the fb yet, so can't
                         * use plane->min_cdclk() :(
                         */
                        if (plane_state->uapi.visible && plane->min_cdclk) {
                                if (crtc_state->double_wide ||
                                    INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
                                        crtc_state->min_cdclk[plane->id] =
                                                DIV_ROUND_UP(crtc_state->pixel_rate, 2);
                                else
                                        crtc_state->min_cdclk[plane->id] =
                                                crtc_state->pixel_rate;
                        }
                        drm_dbg_kms(&dev_priv->drm,
                                    "[PLANE:%d:%s] min_cdclk %d kHz\n",
                                    plane->base.base.id, plane->base.name,
                                    crtc_state->min_cdclk[plane->id]);
                }

                if (crtc_state->hw.active) {
                        min_cdclk = intel_crtc_compute_min_cdclk(crtc_state);
                        if (drm_WARN_ON(dev, min_cdclk < 0))
                                min_cdclk = 0;
                }

                cdclk_state->min_cdclk[crtc->pipe] = min_cdclk;
                cdclk_state->min_voltage_level[crtc->pipe] =
                        crtc_state->min_voltage_level;

                intel_bw_crtc_update(bw_state, crtc_state);

                intel_pipe_config_sanity_check(dev_priv, crtc_state);
        }
}

static void
get_encoder_power_domains(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                struct intel_crtc_state *crtc_state;

                if (!encoder->get_power_domains)
                        continue;

                /*
                 * MST-primary and inactive encoders don't have a crtc state
                 * and neither of these require any power domain references.
                 */
                if (!encoder->base.crtc)
                        continue;

                crtc_state = to_intel_crtc_state(encoder->base.crtc->state);
                encoder->get_power_domains(encoder, crtc_state);
        }
}

static void intel_early_display_was(struct drm_i915_private *dev_priv)
{
        /*
         * Display WA #1185 WaDisableDARBFClkGating:cnl,glk,icl,ehl,tgl
         * Also known as Wa_14010480278.
         */
        if (IS_GEN_RANGE(dev_priv, 10, 12) || IS_GEMINILAKE(dev_priv))
                intel_de_write(dev_priv, GEN9_CLKGATE_DIS_0,
                               intel_de_read(dev_priv, GEN9_CLKGATE_DIS_0) | DARBF_GATING_DIS);

        if (IS_HASWELL(dev_priv)) {
                /*
                 * WaRsPkgCStateDisplayPMReq:hsw
                 * System hang if this isn't done before disabling all planes!
                 */
                intel_de_write(dev_priv, CHICKEN_PAR1_1,
                               intel_de_read(dev_priv, CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES);
        }
}

static void ibx_sanitize_pch_hdmi_port(struct drm_i915_private *dev_priv,
                                       enum port port, i915_reg_t hdmi_reg)
{
        u32 val = intel_de_read(dev_priv, hdmi_reg);

        if (val & SDVO_ENABLE ||
            (val & SDVO_PIPE_SEL_MASK) == SDVO_PIPE_SEL(PIPE_A))
                return;

        drm_dbg_kms(&dev_priv->drm,
                    "Sanitizing transcoder select for HDMI %c\n",
                    port_name(port));

        val &= ~SDVO_PIPE_SEL_MASK;
        val |= SDVO_PIPE_SEL(PIPE_A);

        intel_de_write(dev_priv, hdmi_reg, val);
}

static void ibx_sanitize_pch_dp_port(struct drm_i915_private *dev_priv,
                                     enum port port, i915_reg_t dp_reg)
{
        u32 val = intel_de_read(dev_priv, dp_reg);

        if (val & DP_PORT_EN ||
            (val & DP_PIPE_SEL_MASK) == DP_PIPE_SEL(PIPE_A))
                return;

        drm_dbg_kms(&dev_priv->drm,
                    "Sanitizing transcoder select for DP %c\n",
                    port_name(port));

        val &= ~DP_PIPE_SEL_MASK;
        val |= DP_PIPE_SEL(PIPE_A);

        intel_de_write(dev_priv, dp_reg, val);
}

static void ibx_sanitize_pch_ports(struct drm_i915_private *dev_priv)
{
        /*
         * The BIOS may select transcoder B on some of the PCH
         * ports even it doesn't enable the port. This would trip
         * assert_pch_dp_disabled() and assert_pch_hdmi_disabled().
         * Sanitize the transcoder select bits to prevent that. We
         * assume that the BIOS never actually enabled the port,
         * because if it did we'd actually have to toggle the port
         * on and back off to make the transcoder A select stick
         * (see. intel_dp_link_down(), intel_disable_hdmi(),
         * intel_disable_sdvo()).
         */
        ibx_sanitize_pch_dp_port(dev_priv, PORT_B, PCH_DP_B);
        ibx_sanitize_pch_dp_port(dev_priv, PORT_C, PCH_DP_C);
        ibx_sanitize_pch_dp_port(dev_priv, PORT_D, PCH_DP_D);

        /* PCH SDVOB multiplex with HDMIB */
        ibx_sanitize_pch_hdmi_port(dev_priv, PORT_B, PCH_HDMIB);
        ibx_sanitize_pch_hdmi_port(dev_priv, PORT_C, PCH_HDMIC);
        ibx_sanitize_pch_hdmi_port(dev_priv, PORT_D, PCH_HDMID);
}

/* Scan out the current hw modeset state,
 * and sanitizes it to the current state
 */
static void
intel_modeset_setup_hw_state(struct drm_device *dev,
                             struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_encoder *encoder;
        struct intel_crtc *crtc;
        intel_wakeref_t wakeref;

        wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);

        intel_early_display_was(dev_priv);
        intel_modeset_readout_hw_state(dev);

        /* HW state is read out, now we need to sanitize this mess. */

        /* Sanitize the TypeC port mode upfront, encoders depend on this */
        for_each_intel_encoder(dev, encoder) {
                enum phy phy = intel_port_to_phy(dev_priv, encoder->port);

                /* We need to sanitize only the MST primary port. */
                if (encoder->type != INTEL_OUTPUT_DP_MST &&
                    intel_phy_is_tc(dev_priv, phy))
                        intel_tc_port_sanitize(enc_to_dig_port(encoder));
        }

        get_encoder_power_domains(dev_priv);

        if (HAS_PCH_IBX(dev_priv))
                ibx_sanitize_pch_ports(dev_priv);

        /*
         * intel_sanitize_plane_mapping() may need to do vblank
         * waits, so we need vblank interrupts restored beforehand.
         */
        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                drm_crtc_vblank_reset(&crtc->base);

                if (crtc_state->hw.active)
                        intel_crtc_vblank_on(crtc_state);
        }

        intel_sanitize_plane_mapping(dev_priv);

        for_each_intel_encoder(dev, encoder)
                intel_sanitize_encoder(encoder);

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                intel_sanitize_crtc(crtc, ctx);
                intel_dump_pipe_config(crtc_state, NULL, "[setup_hw_state]");
        }

        intel_modeset_update_connector_atomic_state(dev);

        intel_dpll_sanitize_state(dev_priv);

        if (IS_G4X(dev_priv)) {
                g4x_wm_get_hw_state(dev_priv);
                g4x_wm_sanitize(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                vlv_wm_get_hw_state(dev_priv);
                vlv_wm_sanitize(dev_priv);
        } else if (INTEL_GEN(dev_priv) >= 9) {
                skl_wm_get_hw_state(dev_priv);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                ilk_wm_get_hw_state(dev_priv);
        }

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);
                u64 put_domains;

                put_domains = modeset_get_crtc_power_domains(crtc_state);
                if (drm_WARN_ON(dev, put_domains))
                        modeset_put_power_domains(dev_priv, put_domains);
        }

        intel_display_power_put(dev_priv, POWER_DOMAIN_INIT, wakeref);
}

void intel_display_resume(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state = dev_priv->modeset_restore_state;
        struct drm_modeset_acquire_ctx ctx;
        int ret;

        dev_priv->modeset_restore_state = NULL;
        if (state)
                state->acquire_ctx = &ctx;

        drm_modeset_acquire_init(&ctx, 0);

        while (1) {
                ret = drm_modeset_lock_all_ctx(dev, &ctx);
                if (ret != -EDEADLK)
                        break;

                drm_modeset_backoff(&ctx);
        }

        if (!ret)
                ret = __intel_display_resume(dev, state, &ctx);

        intel_enable_ipc(dev_priv);
        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        if (ret)
                drm_err(&dev_priv->drm,
                        "Restoring old state failed with %i\n", ret);
        if (state)
                drm_atomic_state_put(state);
}

static void intel_hpd_poll_fini(struct drm_i915_private *i915)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;

        /* Kill all the work that may have been queued by hpd. */
        drm_connector_list_iter_begin(&i915->drm, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->modeset_retry_work.func)
                        cancel_work_sync(&connector->modeset_retry_work);
                if (connector->hdcp.shim) {
                        cancel_delayed_work_sync(&connector->hdcp.check_work);
                        cancel_work_sync(&connector->hdcp.prop_work);
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}

/* part #1: call before irq uninstall */
void intel_modeset_driver_remove(struct drm_i915_private *i915)
{
        flush_workqueue(i915->flip_wq);
        flush_workqueue(i915->modeset_wq);

        flush_work(&i915->atomic_helper.free_work);
        drm_WARN_ON(&i915->drm, !llist_empty(&i915->atomic_helper.free_list));
}

/* part #2: call after irq uninstall */
void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915)
{
        /*
         * Due to the hpd irq storm handling the hotplug work can re-arm the
         * poll handlers. Hence disable polling after hpd handling is shut down.
         */
        intel_hpd_poll_fini(i915);

        /*
         * MST topology needs to be suspended so we don't have any calls to
         * fbdev after it's finalized. MST will be destroyed later as part of
         * drm_mode_config_cleanup()
         */
        intel_dp_mst_suspend(i915);

        /* poll work can call into fbdev, hence clean that up afterwards */
        intel_fbdev_fini(i915);

        intel_unregister_dsm_handler();

        intel_fbc_global_disable(i915);

        /* flush any delayed tasks or pending work */
        flush_scheduled_work();

        intel_hdcp_component_fini(i915);

        intel_mode_config_cleanup(i915);

        intel_overlay_cleanup(i915);

        intel_gmbus_teardown(i915);

        destroy_workqueue(i915->flip_wq);
        destroy_workqueue(i915->modeset_wq);

        intel_fbc_cleanup_cfb(i915);
}

#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)

struct intel_display_error_state {

        u32 power_well_driver;

        struct intel_cursor_error_state {
                u32 control;
                u32 position;
                u32 base;
                u32 size;
        } cursor[I915_MAX_PIPES];

        struct intel_pipe_error_state {
                bool power_domain_on;
                u32 source;
                u32 stat;
        } pipe[I915_MAX_PIPES];

        struct intel_plane_error_state {
                u32 control;
                u32 stride;
                u32 size;
                u32 pos;
                u32 addr;
                u32 surface;
                u32 tile_offset;
        } plane[I915_MAX_PIPES];

        struct intel_transcoder_error_state {
                bool available;
                bool power_domain_on;
                enum transcoder cpu_transcoder;

                u32 conf;

                u32 htotal;
                u32 hblank;
                u32 hsync;
                u32 vtotal;
                u32 vblank;
                u32 vsync;
        } transcoder[5];
};

struct intel_display_error_state *
intel_display_capture_error_state(struct drm_i915_private *dev_priv)
{
        struct intel_display_error_state *error;
        int transcoders[] = {
                TRANSCODER_A,
                TRANSCODER_B,
                TRANSCODER_C,
                TRANSCODER_D,
                TRANSCODER_EDP,
        };
        int i;

        BUILD_BUG_ON(ARRAY_SIZE(transcoders) != ARRAY_SIZE(error->transcoder));

        if (!HAS_DISPLAY(dev_priv) || !INTEL_DISPLAY_ENABLED(dev_priv))
                return NULL;

        error = kzalloc(sizeof(*error), GFP_ATOMIC);
        if (error == NULL)
                return NULL;

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                error->power_well_driver = intel_de_read(dev_priv,
                                                         HSW_PWR_WELL_CTL2);

        for_each_pipe(dev_priv, i) {
                error->pipe[i].power_domain_on =
                        __intel_display_power_is_enabled(dev_priv,
                                                         POWER_DOMAIN_PIPE(i));
                if (!error->pipe[i].power_domain_on)
                        continue;

                error->cursor[i].control = intel_de_read(dev_priv, CURCNTR(i));
                error->cursor[i].position = intel_de_read(dev_priv, CURPOS(i));
                error->cursor[i].base = intel_de_read(dev_priv, CURBASE(i));

                error->plane[i].control = intel_de_read(dev_priv, DSPCNTR(i));
                error->plane[i].stride = intel_de_read(dev_priv, DSPSTRIDE(i));
                if (INTEL_GEN(dev_priv) <= 3) {
                        error->plane[i].size = intel_de_read(dev_priv,
                                                             DSPSIZE(i));
                        error->plane[i].pos = intel_de_read(dev_priv,
                                                            DSPPOS(i));
                }
                if (INTEL_GEN(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
                        error->plane[i].addr = intel_de_read(dev_priv,
                                                             DSPADDR(i));
                if (INTEL_GEN(dev_priv) >= 4) {
                        error->plane[i].surface = intel_de_read(dev_priv,
                                                                DSPSURF(i));
                        error->plane[i].tile_offset = intel_de_read(dev_priv,
                                                                    DSPTILEOFF(i));
                }

                error->pipe[i].source = intel_de_read(dev_priv, PIPESRC(i));

                if (HAS_GMCH(dev_priv))
                        error->pipe[i].stat = intel_de_read(dev_priv,
                                                            PIPESTAT(i));
        }

        for (i = 0; i < ARRAY_SIZE(error->transcoder); i++) {
                enum transcoder cpu_transcoder = transcoders[i];

                if (!HAS_TRANSCODER(dev_priv, cpu_transcoder))
                        continue;

                error->transcoder[i].available = true;
                error->transcoder[i].power_domain_on =
                        __intel_display_power_is_enabled(dev_priv,
                                POWER_DOMAIN_TRANSCODER(cpu_transcoder));
                if (!error->transcoder[i].power_domain_on)
                        continue;

                error->transcoder[i].cpu_transcoder = cpu_transcoder;

                error->transcoder[i].conf = intel_de_read(dev_priv,
                                                          PIPECONF(cpu_transcoder));
                error->transcoder[i].htotal = intel_de_read(dev_priv,
                                                            HTOTAL(cpu_transcoder));
                error->transcoder[i].hblank = intel_de_read(dev_priv,
                                                            HBLANK(cpu_transcoder));
                error->transcoder[i].hsync = intel_de_read(dev_priv,
                                                           HSYNC(cpu_transcoder));
                error->transcoder[i].vtotal = intel_de_read(dev_priv,
                                                            VTOTAL(cpu_transcoder));
                error->transcoder[i].vblank = intel_de_read(dev_priv,
                                                            VBLANK(cpu_transcoder));
                error->transcoder[i].vsync = intel_de_read(dev_priv,
                                                           VSYNC(cpu_transcoder));
        }

        return error;
}

#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)

void
intel_display_print_error_state(struct drm_i915_error_state_buf *m,
                                struct intel_display_error_state *error)
{
        struct drm_i915_private *dev_priv = m->i915;
        int i;

        if (!error)
                return;

        err_printf(m, "Num Pipes: %d\n", INTEL_NUM_PIPES(dev_priv));
        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                err_printf(m, "PWR_WELL_CTL2: %08x\n",
                           error->power_well_driver);
        for_each_pipe(dev_priv, i) {
                err_printf(m, "Pipe [%d]:\n", i);
                err_printf(m, "  Power: %s\n",
                           onoff(error->pipe[i].power_domain_on));
                err_printf(m, "  SRC: %08x\n", error->pipe[i].source);
                err_printf(m, "  STAT: %08x\n", error->pipe[i].stat);

                err_printf(m, "Plane [%d]:\n", i);
                err_printf(m, "  CNTR: %08x\n", error->plane[i].control);
                err_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
                if (INTEL_GEN(dev_priv) <= 3) {
                        err_printf(m, "  SIZE: %08x\n", error->plane[i].size);
                        err_printf(m, "  POS: %08x\n", error->plane[i].pos);
                }
                if (INTEL_GEN(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
                        err_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
                if (INTEL_GEN(dev_priv) >= 4) {
                        err_printf(m, "  SURF: %08x\n", error->plane[i].surface);
                        err_printf(m, "  TILEOFF: %08x\n", error->plane[i].tile_offset);
                }

                err_printf(m, "Cursor [%d]:\n", i);
                err_printf(m, "  CNTR: %08x\n", error->cursor[i].control);
                err_printf(m, "  POS: %08x\n", error->cursor[i].position);
                err_printf(m, "  BASE: %08x\n", error->cursor[i].base);
        }

        for (i = 0; i < ARRAY_SIZE(error->transcoder); i++) {
                if (!error->transcoder[i].available)
                        continue;

                err_printf(m, "CPU transcoder: %s\n",
                           transcoder_name(error->transcoder[i].cpu_transcoder));
                err_printf(m, "  Power: %s\n",
                           onoff(error->transcoder[i].power_domain_on));
                err_printf(m, "  CONF: %08x\n", error->transcoder[i].conf);
                err_printf(m, "  HTOTAL: %08x\n", error->transcoder[i].htotal);
                err_printf(m, "  HBLANK: %08x\n", error->transcoder[i].hblank);
                err_printf(m, "  HSYNC: %08x\n", error->transcoder[i].hsync);
                err_printf(m, "  VTOTAL: %08x\n", error->transcoder[i].vtotal);
                err_printf(m, "  VBLANK: %08x\n", error->transcoder[i].vblank);
                err_printf(m, "  VSYNC: %08x\n", error->transcoder[i].vsync);
        }
}

#endif