drivers/gpu/drm/gma500/cdv_intel_crt.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *      Eric Anholt <eric@anholt.net>
  25  */
  26
  27 #include <linux/delay.h>
  28 #include <linux/i2c.h>
  29 #include <linux/pm_runtime.h>
  30
  31 #include <drm/drm_simple_kms_helper.h>
  32
  33 #include "cdv_device.h"
  34 #include "intel_bios.h"
  35 #include "power.h"
  36 #include "psb_drv.h"
  37 #include "psb_intel_drv.h"
  38 #include "psb_intel_reg.h"
  39
  40
  41 static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
  42 {
  43         struct drm_device *dev = encoder->dev;
  44         u32 temp, reg;
  45         reg = ADPA;
  46
  47         temp = REG_READ(reg);
  48         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  49         temp &= ~ADPA_DAC_ENABLE;
  50
  51         switch (mode) {
  52         case DRM_MODE_DPMS_ON:
  53                 temp |= ADPA_DAC_ENABLE;
  54                 break;
  55         case DRM_MODE_DPMS_STANDBY:
  56                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
  57                 break;
  58         case DRM_MODE_DPMS_SUSPEND:
  59                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
  60                 break;
  61         case DRM_MODE_DPMS_OFF:
  62                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
  63                 break;
  64         }
  65
  66         REG_WRITE(reg, temp);
  67 }
  68
  69 static enum drm_mode_status cdv_intel_crt_mode_valid(struct drm_connector *connector,
  70                                 struct drm_display_mode *mode)
  71 {
  72         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  73                 return MODE_NO_DBLESCAN;
  74
  75         /* The lowest clock for CDV is 20000KHz */
  76         if (mode->clock < 20000)
  77                 return MODE_CLOCK_LOW;
  78
  79         /* The max clock for CDV is 355 instead of 400 */
  80         if (mode->clock > 355000)
  81                 return MODE_CLOCK_HIGH;
  82
  83         return MODE_OK;
  84 }
  85
  86 static void cdv_intel_crt_mode_set(struct drm_encoder *encoder,
  87                                struct drm_display_mode *mode,
  88                                struct drm_display_mode *adjusted_mode)
  89 {
  90
  91         struct drm_device *dev = encoder->dev;
  92         struct drm_crtc *crtc = encoder->crtc;
  93         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
  94         int dpll_md_reg;
  95         u32 adpa, dpll_md;
  96         u32 adpa_reg;
  97
  98         if (gma_crtc->pipe == 0)
  99                 dpll_md_reg = DPLL_A_MD;
 100         else
 101                 dpll_md_reg = DPLL_B_MD;
 102
 103         adpa_reg = ADPA;
 104
 105         /*
 106          * Disable separate mode multiplier used when cloning SDVO to CRT
 107          * XXX this needs to be adjusted when we really are cloning
 108          */
 109         {
 110                 dpll_md = REG_READ(dpll_md_reg);
 111                 REG_WRITE(dpll_md_reg,
 112                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 113         }
 114
 115         adpa = 0;
 116         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 117                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 118         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 119                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 120
 121         if (gma_crtc->pipe == 0)
 122                 adpa |= ADPA_PIPE_A_SELECT;
 123         else
 124                 adpa |= ADPA_PIPE_B_SELECT;
 125
 126         REG_WRITE(adpa_reg, adpa);
 127 }
 128
 129
 130 /*
 131  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 132  *
 133  * \return true if CRT is connected.
 134  * \return false if CRT is disconnected.
 135  */
 136 static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
 137                                                                 bool force)
 138 {
 139         struct drm_device *dev = connector->dev;
 140         u32 hotplug_en;
 141         int i, tries = 0, ret = false;
 142         u32 orig;
 143
 144         /*
 145          * On a CDV thep, CRT detect sequence need to be done twice
 146          * to get a reliable result.
 147          */
 148         tries = 2;
 149
 150         orig = hotplug_en = REG_READ(PORT_HOTPLUG_EN);
 151         hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
 152         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 153
 154         hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
 155         hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
 156
 157         for (i = 0; i < tries ; i++) {
 158                 unsigned long timeout;
 159                 /* turn on the FORCE_DETECT */
 160                 REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 161                 timeout = jiffies + msecs_to_jiffies(1000);
 162                 /* wait for FORCE_DETECT to go off */
 163                 do {
 164                         if (!(REG_READ(PORT_HOTPLUG_EN) &
 165                                         CRT_HOTPLUG_FORCE_DETECT))
 166                                 break;
 167                         msleep(1);
 168                 } while (time_after(timeout, jiffies));
 169         }
 170
 171         if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
 172             CRT_HOTPLUG_MONITOR_NONE)
 173                 ret = true;
 174
 175          /* clear the interrupt we just generated, if any */
 176         REG_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 177
 178         /* and put the bits back */
 179         REG_WRITE(PORT_HOTPLUG_EN, orig);
 180         return ret;
 181 }
 182
 183 static enum drm_connector_status cdv_intel_crt_detect(
 184                                 struct drm_connector *connector, bool force)
 185 {
 186         if (cdv_intel_crt_detect_hotplug(connector, force))
 187                 return connector_status_connected;
 188         else
 189                 return connector_status_disconnected;
 190 }
 191
 192 static void cdv_intel_crt_destroy(struct drm_connector *connector)
 193 {
 194         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 195
 196         psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 197         drm_connector_unregister(connector);
 198         drm_connector_cleanup(connector);
 199         kfree(connector);
 200 }
 201
 202 static int cdv_intel_crt_get_modes(struct drm_connector *connector)
 203 {
 204         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 205         return psb_intel_ddc_get_modes(connector,
 206                                        &gma_encoder->ddc_bus->adapter);
 207 }
 208
 209 static int cdv_intel_crt_set_property(struct drm_connector *connector,
 210                                   struct drm_property *property,
 211                                   uint64_t value)
 212 {
 213         return 0;
 214 }
 215
 216 /*
 217  * Routines for controlling stuff on the analog port
 218  */
 219
 220 static const struct drm_encoder_helper_funcs cdv_intel_crt_helper_funcs = {
 221         .dpms = cdv_intel_crt_dpms,
 222         .prepare = gma_encoder_prepare,
 223         .commit = gma_encoder_commit,
 224         .mode_set = cdv_intel_crt_mode_set,
 225 };
 226
 227 static const struct drm_connector_funcs cdv_intel_crt_connector_funcs = {
 228         .dpms = drm_helper_connector_dpms,
 229         .detect = cdv_intel_crt_detect,
 230         .fill_modes = drm_helper_probe_single_connector_modes,
 231         .destroy = cdv_intel_crt_destroy,
 232         .set_property = cdv_intel_crt_set_property,
 233 };
 234
 235 static const struct drm_connector_helper_funcs
 236                                 cdv_intel_crt_connector_helper_funcs = {
 237         .mode_valid = cdv_intel_crt_mode_valid,
 238         .get_modes = cdv_intel_crt_get_modes,
 239         .best_encoder = gma_best_encoder,
 240 };
 241
 242 void cdv_intel_crt_init(struct drm_device *dev,
 243                         struct psb_intel_mode_device *mode_dev)
 244 {
 245
 246         struct gma_connector *gma_connector;
 247         struct gma_encoder *gma_encoder;
 248         struct drm_connector *connector;
 249         struct drm_encoder *encoder;
 250
 251         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 252         if (!gma_encoder)
 253                 return;
 254
 255         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 256         if (!gma_connector)
 257                 goto failed_connector;
 258
 259         connector = &gma_connector->base;
 260         connector->polled = DRM_CONNECTOR_POLL_HPD;
 261         drm_connector_init(dev, connector,
 262                 &cdv_intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 263
 264         encoder = &gma_encoder->base;
 265         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
 266
 267         gma_connector_attach_encoder(gma_connector, gma_encoder);
 268
 269         /* Set up the DDC bus. */
 270         gma_encoder->ddc_bus = psb_intel_i2c_create(dev, GPIOA, "CRTDDC_A");
 271         if (!gma_encoder->ddc_bus) {
 272                 dev_printk(KERN_ERR, dev->dev, "DDC bus registration failed.\n");
 273                 goto failed_ddc;
 274         }
 275
 276         gma_encoder->type = INTEL_OUTPUT_ANALOG;
 277         connector->interlace_allowed = 0;
 278         connector->doublescan_allowed = 0;
 279
 280         drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
 281         drm_connector_helper_add(connector,
 282                                         &cdv_intel_crt_connector_helper_funcs);
 283
 284         drm_connector_register(connector);
 285
 286         return;
 287 failed_ddc:
 288         drm_encoder_cleanup(&gma_encoder->base);
 289         drm_connector_cleanup(&gma_connector->base);
 290         kfree(gma_connector);
 291 failed_connector:
 292         kfree(gma_encoder);
 293         return;
 294 }