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_crtc_helper.h>
  32 #include <drm/drm_modeset_helper_vtables.h>
  33 #include <drm/drm_simple_kms_helper.h>
  34
  35 #include "cdv_device.h"
  36 #include "intel_bios.h"
  37 #include "power.h"
  38 #include "psb_drv.h"
  39 #include "psb_intel_drv.h"
  40 #include "psb_intel_reg.h"
  41
  42
  43 static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
  44 {
  45         struct drm_device *dev = encoder->dev;
  46         u32 temp, reg;
  47         reg = ADPA;
  48
  49         temp = REG_READ(reg);
  50         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  51         temp &= ~ADPA_DAC_ENABLE;
  52
  53         switch (mode) {
  54         case DRM_MODE_DPMS_ON:
  55                 temp |= ADPA_DAC_ENABLE;
  56                 break;
  57         case DRM_MODE_DPMS_STANDBY:
  58                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
  59                 break;
  60         case DRM_MODE_DPMS_SUSPEND:
  61                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
  62                 break;
  63         case DRM_MODE_DPMS_OFF:
  64                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
  65                 break;
  66         }
  67
  68         REG_WRITE(reg, temp);
  69 }
  70
  71 static enum drm_mode_status cdv_intel_crt_mode_valid(struct drm_connector *connector,
  72                                 struct drm_display_mode *mode)
  73 {
  74         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  75                 return MODE_NO_DBLESCAN;
  76
  77         /* The lowest clock for CDV is 20000KHz */
  78         if (mode->clock < 20000)
  79                 return MODE_CLOCK_LOW;
  80
  81         /* The max clock for CDV is 355 instead of 400 */
  82         if (mode->clock > 355000)
  83                 return MODE_CLOCK_HIGH;
  84
  85         return MODE_OK;
  86 }
  87
  88 static void cdv_intel_crt_mode_set(struct drm_encoder *encoder,
  89                                struct drm_display_mode *mode,
  90                                struct drm_display_mode *adjusted_mode)
  91 {
  92
  93         struct drm_device *dev = encoder->dev;
  94         struct drm_crtc *crtc = encoder->crtc;
  95         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
  96         int dpll_md_reg;
  97         u32 adpa, dpll_md;
  98         u32 adpa_reg;
  99
 100         if (gma_crtc->pipe == 0)
 101                 dpll_md_reg = DPLL_A_MD;
 102         else
 103                 dpll_md_reg = DPLL_B_MD;
 104
 105         adpa_reg = ADPA;
 106
 107         /*
 108          * Disable separate mode multiplier used when cloning SDVO to CRT
 109          * XXX this needs to be adjusted when we really are cloning
 110          */
 111         {
 112                 dpll_md = REG_READ(dpll_md_reg);
 113                 REG_WRITE(dpll_md_reg,
 114                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 115         }
 116
 117         adpa = 0;
 118         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 119                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 120         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 121                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 122
 123         if (gma_crtc->pipe == 0)
 124                 adpa |= ADPA_PIPE_A_SELECT;
 125         else
 126                 adpa |= ADPA_PIPE_B_SELECT;
 127
 128         REG_WRITE(adpa_reg, adpa);
 129 }
 130
 131
 132 /*
 133  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 134  *
 135  * \return true if CRT is connected.
 136  * \return false if CRT is disconnected.
 137  */
 138 static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
 139                                                                 bool force)
 140 {
 141         struct drm_device *dev = connector->dev;
 142         u32 hotplug_en;
 143         int i, tries = 0, ret = false;
 144         u32 orig;
 145
 146         /*
 147          * On a CDV thep, CRT detect sequence need to be done twice
 148          * to get a reliable result.
 149          */
 150         tries = 2;
 151
 152         orig = hotplug_en = REG_READ(PORT_HOTPLUG_EN);
 153         hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
 154         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 155
 156         hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
 157         hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
 158
 159         for (i = 0; i < tries ; i++) {
 160                 unsigned long timeout;
 161                 /* turn on the FORCE_DETECT */
 162                 REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 163                 timeout = jiffies + msecs_to_jiffies(1000);
 164                 /* wait for FORCE_DETECT to go off */
 165                 do {
 166                         if (!(REG_READ(PORT_HOTPLUG_EN) &
 167                                         CRT_HOTPLUG_FORCE_DETECT))
 168                                 break;
 169                         msleep(1);
 170                 } while (time_after(timeout, jiffies));
 171         }
 172
 173         if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
 174             CRT_HOTPLUG_MONITOR_NONE)
 175                 ret = true;
 176
 177          /* clear the interrupt we just generated, if any */
 178         REG_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 179
 180         /* and put the bits back */
 181         REG_WRITE(PORT_HOTPLUG_EN, orig);
 182         return ret;
 183 }
 184
 185 static enum drm_connector_status cdv_intel_crt_detect(
 186                                 struct drm_connector *connector, bool force)
 187 {
 188         if (cdv_intel_crt_detect_hotplug(connector, force))
 189                 return connector_status_connected;
 190         else
 191                 return connector_status_disconnected;
 192 }
 193
 194 static void cdv_intel_crt_destroy(struct drm_connector *connector)
 195 {
 196         struct gma_connector *gma_connector = to_gma_connector(connector);
 197         struct gma_i2c_chan *ddc_bus = to_gma_i2c_chan(connector->ddc);
 198
 199         gma_i2c_destroy(ddc_bus);
 200         drm_connector_cleanup(connector);
 201         kfree(gma_connector);
 202 }
 203
 204 static int cdv_intel_crt_get_modes(struct drm_connector *connector)
 205 {
 206         return psb_intel_ddc_get_modes(connector, connector->ddc);
 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 gma_i2c_chan *ddc_bus;
 249         struct drm_connector *connector;
 250         struct drm_encoder *encoder;
 251         int ret;
 252
 253         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 254         if (!gma_encoder)
 255                 return;
 256
 257         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 258         if (!gma_connector)
 259                 goto err_free_encoder;
 260
 261         /* Set up the DDC bus. */
 262         ddc_bus = gma_i2c_create(dev, GPIOA, "CRTDDC_A");
 263         if (!ddc_bus) {
 264                 dev_printk(KERN_ERR, dev->dev, "DDC bus registration failed.\n");
 265                 goto err_free_connector;
 266         }
 267
 268         connector = &gma_connector->base;
 269         connector->polled = DRM_CONNECTOR_POLL_HPD;
 270         ret = drm_connector_init_with_ddc(dev, connector,
 271                                           &cdv_intel_crt_connector_funcs,
 272                                           DRM_MODE_CONNECTOR_VGA,
 273                                           &ddc_bus->base);
 274         if (ret)
 275                 goto err_ddc_destroy;
 276
 277         encoder = &gma_encoder->base;
 278         ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
 279         if (ret)
 280                 goto err_connector_cleanup;
 281
 282         gma_connector_attach_encoder(gma_connector, gma_encoder);
 283
 284         gma_encoder->type = INTEL_OUTPUT_ANALOG;
 285         connector->interlace_allowed = 0;
 286         connector->doublescan_allowed = 0;
 287
 288         drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
 289         drm_connector_helper_add(connector,
 290                                         &cdv_intel_crt_connector_helper_funcs);
 291
 292         return;
 293
 294 err_connector_cleanup:
 295         drm_connector_cleanup(&gma_connector->base);
 296 err_ddc_destroy:
 297         gma_i2c_destroy(ddc_bus);
 298 err_free_connector:
 299         kfree(gma_connector);
 300 err_free_encoder:
 301         kfree(gma_encoder);
 302         return;
 303 }