drivers/gpu/drm/i915/intel_bios.c

   1 /*
   2  * Copyright © 2006 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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27 #include <drm/drm_dp_helper.h>
  28 #include "drmP.h"
  29 #include "drm.h"
  30 #include "i915_drm.h"
  31 #include "i915_drv.h"
  32 #include "intel_bios.h"
  33
  34 #define SLAVE_ADDR1     0x70
  35 #define SLAVE_ADDR2     0x72
  36
  37 static int panel_type;
  38
  39 static void *
  40 find_section(struct bdb_header *bdb, int section_id)
  41 {
  42         u8 *base = (u8 *)bdb;
  43         int index = 0;
  44         u16 total, current_size;
  45         u8 current_id;
  46
  47         /* skip to first section */
  48         index += bdb->header_size;
  49         total = bdb->bdb_size;
  50
  51         /* walk the sections looking for section_id */
  52         while (index < total) {
  53                 current_id = *(base + index);
  54                 index++;
  55                 current_size = *((u16 *)(base + index));
  56                 index += 2;
  57                 if (current_id == section_id)
  58                         return base + index;
  59                 index += current_size;
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static u16
  66 get_blocksize(void *p)
  67 {
  68         u16 *block_ptr, block_size;
  69
  70         block_ptr = (u16 *)((char *)p - 2);
  71         block_size = *block_ptr;
  72         return block_size;
  73 }
  74
  75 static void
  76 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  77                         struct lvds_dvo_timing *dvo_timing)
  78 {
  79         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  80                 dvo_timing->hactive_lo;
  81         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  82                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  83         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  84                 dvo_timing->hsync_pulse_width;
  85         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  86                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  87
  88         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  89                 dvo_timing->vactive_lo;
  90         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  91                 dvo_timing->vsync_off;
  92         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  93                 dvo_timing->vsync_pulse_width;
  94         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  95                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  96         panel_fixed_mode->clock = dvo_timing->clock * 10;
  97         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  98
  99         if (dvo_timing->hsync_positive)
 100                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 101         else
 102                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 103
 104         if (dvo_timing->vsync_positive)
 105                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 106         else
 107                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 108
 109         /* Some VBTs have bogus h/vtotal values */
 110         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 111                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 112         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 113                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 114
 115         drm_mode_set_name(panel_fixed_mode);
 116 }
 117
 118 /* Try to find integrated panel data */
 119 static void
 120 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 121                             struct bdb_header *bdb)
 122 {
 123         struct bdb_lvds_options *lvds_options;
 124         struct bdb_lvds_lfp_data *lvds_lfp_data;
 125         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 126         struct bdb_lvds_lfp_data_entry *entry;
 127         struct lvds_dvo_timing *dvo_timing;
 128         struct drm_display_mode *panel_fixed_mode;
 129         int lfp_data_size, dvo_timing_offset;
 130         int i, temp_downclock;
 131         struct drm_display_mode *temp_mode;
 132
 133         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 134         if (!lvds_options)
 135                 return;
 136
 137         dev_priv->lvds_dither = lvds_options->pixel_dither;
 138         if (lvds_options->panel_type == 0xff)
 139                 return;
 140
 141         panel_type = lvds_options->panel_type;
 142
 143         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 144         if (!lvds_lfp_data)
 145                 return;
 146
 147         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 148         if (!lvds_lfp_data_ptrs)
 149                 return;
 150
 151         dev_priv->lvds_vbt = 1;
 152
 153         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 154                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 155         entry = (struct bdb_lvds_lfp_data_entry *)
 156                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 157                                                    lvds_options->panel_type));
 158         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 159                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 160
 161         /*
 162          * the size of fp_timing varies on the different platform.
 163          * So calculate the DVO timing relative offset in LVDS data
 164          * entry to get the DVO timing entry
 165          */
 166         dvo_timing = (struct lvds_dvo_timing *)
 167                         ((unsigned char *)entry + dvo_timing_offset);
 168
 169         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 170         if (!panel_fixed_mode)
 171                 return;
 172
 173         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 174
 175         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 176
 177         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 178         drm_mode_debug_printmodeline(panel_fixed_mode);
 179
 180         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
 181         temp_downclock = panel_fixed_mode->clock;
 182         /*
 183          * enumerate the LVDS panel timing info entry in VBT to check whether
 184          * the LVDS downclock is found.
 185          */
 186         for (i = 0; i < 16; i++) {
 187                 entry = (struct bdb_lvds_lfp_data_entry *)
 188                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
 189                 dvo_timing = (struct lvds_dvo_timing *)
 190                         ((unsigned char *)entry + dvo_timing_offset);
 191
 192                 fill_detail_timing_data(temp_mode, dvo_timing);
 193
 194                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
 195                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
 196                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
 197                 temp_mode->htotal == panel_fixed_mode->htotal &&
 198                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
 199                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
 200                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
 201                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
 202                 temp_mode->clock < temp_downclock) {
 203                         /*
 204                          * downclock is already found. But we expect
 205                          * to find the lower downclock.
 206                          */
 207                         temp_downclock = temp_mode->clock;
 208                 }
 209                 /* clear it to zero */
 210                 memset(temp_mode, 0, sizeof(*temp_mode));
 211         }
 212         kfree(temp_mode);
 213         if (temp_downclock < panel_fixed_mode->clock &&
 214             i915_lvds_downclock) {
 215                 dev_priv->lvds_downclock_avail = 1;
 216                 dev_priv->lvds_downclock = temp_downclock;
 217                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
 218                                 "Normal Clock %dKHz, downclock %dKHz\n",
 219                                 temp_downclock, panel_fixed_mode->clock);
 220         }
 221         return;
 222 }
 223
 224 /* Try to find sdvo panel data */
 225 static void
 226 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 227                       struct bdb_header *bdb)
 228 {
 229         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 230         struct lvds_dvo_timing *dvo_timing;
 231         struct drm_display_mode *panel_fixed_mode;
 232
 233         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 234         if (!sdvo_lvds_options)
 235                 return;
 236
 237         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 238         if (!dvo_timing)
 239                 return;
 240
 241         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 242
 243         if (!panel_fixed_mode)
 244                 return;
 245
 246         fill_detail_timing_data(panel_fixed_mode,
 247                         dvo_timing + sdvo_lvds_options->panel_type);
 248
 249         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 250
 251         return;
 252 }
 253
 254 static void
 255 parse_general_features(struct drm_i915_private *dev_priv,
 256                        struct bdb_header *bdb)
 257 {
 258         struct drm_device *dev = dev_priv->dev;
 259         struct bdb_general_features *general;
 260
 261         general = find_section(bdb, BDB_GENERAL_FEATURES);
 262         if (general) {
 263                 dev_priv->int_tv_support = general->int_tv_support;
 264                 dev_priv->int_crt_support = general->int_crt_support;
 265                 dev_priv->lvds_use_ssc = general->enable_ssc;
 266
 267                 if (IS_I85X(dev))
 268                         dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
 269                 else if (IS_GEN5(dev) || IS_GEN6(dev))
 270                         dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 120;
 271                 else
 272                         dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
 273         }
 274 }
 275
 276 static void
 277 parse_general_definitions(struct drm_i915_private *dev_priv,
 278                           struct bdb_header *bdb)
 279 {
 280         struct bdb_general_definitions *general;
 281
 282         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 283         if (general) {
 284                 u16 block_size = get_blocksize(general);
 285                 if (block_size >= sizeof(*general)) {
 286                         int bus_pin = general->crt_ddc_gmbus_pin;
 287                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 288                         if (bus_pin >= 1 && bus_pin <= 6)
 289                                 dev_priv->crt_ddc_pin = bus_pin;
 290                 } else {
 291                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 292                                   block_size);
 293                 }
 294         }
 295 }
 296
 297 static void
 298 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 299                           struct bdb_header *bdb)
 300 {
 301         struct sdvo_device_mapping *p_mapping;
 302         struct bdb_general_definitions *p_defs;
 303         struct child_device_config *p_child;
 304         int i, child_device_num, count;
 305         u16     block_size;
 306
 307         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 308         if (!p_defs) {
 309                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 310                 return;
 311         }
 312         /* judge whether the size of child device meets the requirements.
 313          * If the child device size obtained from general definition block
 314          * is different with sizeof(struct child_device_config), skip the
 315          * parsing of sdvo device info
 316          */
 317         if (p_defs->child_dev_size != sizeof(*p_child)) {
 318                 /* different child dev size . Ignore it */
 319                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 320                 return;
 321         }
 322         /* get the block size of general definitions */
 323         block_size = get_blocksize(p_defs);
 324         /* get the number of child device */
 325         child_device_num = (block_size - sizeof(*p_defs)) /
 326                                 sizeof(*p_child);
 327         count = 0;
 328         for (i = 0; i < child_device_num; i++) {
 329                 p_child = &(p_defs->devices[i]);
 330                 if (!p_child->device_type) {
 331                         /* skip the device block if device type is invalid */
 332                         continue;
 333                 }
 334                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 335                         p_child->slave_addr != SLAVE_ADDR2) {
 336                         /*
 337                          * If the slave address is neither 0x70 nor 0x72,
 338                          * it is not a SDVO device. Skip it.
 339                          */
 340                         continue;
 341                 }
 342                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 343                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 344                         /* skip the incorrect SDVO port */
 345                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 346                         continue;
 347                 }
 348                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 349                                 " %s port\n",
 350                                 p_child->slave_addr,
 351                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 352                                         "SDVOB" : "SDVOC");
 353                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 354                 if (!p_mapping->initialized) {
 355                         p_mapping->dvo_port = p_child->dvo_port;
 356                         p_mapping->slave_addr = p_child->slave_addr;
 357                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 358                         p_mapping->ddc_pin = p_child->ddc_pin;
 359                         p_mapping->i2c_pin = p_child->i2c_pin;
 360                         p_mapping->i2c_speed = p_child->i2c_speed;
 361                         p_mapping->initialized = 1;
 362                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
 363                                       p_mapping->dvo_port,
 364                                       p_mapping->slave_addr,
 365                                       p_mapping->dvo_wiring,
 366                                       p_mapping->ddc_pin,
 367                                       p_mapping->i2c_pin,
 368                                       p_mapping->i2c_speed);
 369                 } else {
 370                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 371                                          "two SDVO device.\n");
 372                 }
 373                 if (p_child->slave2_addr) {
 374                         /* Maybe this is a SDVO device with multiple inputs */
 375                         /* And the mapping info is not added */
 376                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 377                                 " is a SDVO device with multiple inputs.\n");
 378                 }
 379                 count++;
 380         }
 381
 382         if (!count) {
 383                 /* No SDVO device info is found */
 384                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 385         }
 386         return;
 387 }
 388
 389 static void
 390 parse_driver_features(struct drm_i915_private *dev_priv,
 391                        struct bdb_header *bdb)
 392 {
 393         struct drm_device *dev = dev_priv->dev;
 394         struct bdb_driver_features *driver;
 395
 396         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 397         if (!driver)
 398                 return;
 399
 400         if (SUPPORTS_EDP(dev) &&
 401             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 402                 dev_priv->edp.support = 1;
 403
 404         if (driver->dual_frequency)
 405                 dev_priv->render_reclock_avail = true;
 406 }
 407
 408 static void
 409 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 410 {
 411         struct bdb_edp *edp;
 412         struct edp_power_seq *edp_pps;
 413         struct edp_link_params *edp_link_params;
 414
 415         edp = find_section(bdb, BDB_EDP);
 416         if (!edp) {
 417                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
 418                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 419                                       "supported, assume %dbpp panel color "
 420                                       "depth.\n",
 421                                       dev_priv->edp.bpp);
 422                 }
 423                 return;
 424         }
 425
 426         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 427         case EDP_18BPP:
 428                 dev_priv->edp.bpp = 18;
 429                 break;
 430         case EDP_24BPP:
 431                 dev_priv->edp.bpp = 24;
 432                 break;
 433         case EDP_30BPP:
 434                 dev_priv->edp.bpp = 30;
 435                 break;
 436         }
 437
 438         /* Get the eDP sequencing and link info */
 439         edp_pps = &edp->power_seqs[panel_type];
 440         edp_link_params = &edp->link_params[panel_type];
 441
 442         dev_priv->edp.pps = *edp_pps;
 443
 444         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 445                 DP_LINK_BW_1_62;
 446         switch (edp_link_params->lanes) {
 447         case 0:
 448                 dev_priv->edp.lanes = 1;
 449                 break;
 450         case 1:
 451                 dev_priv->edp.lanes = 2;
 452                 break;
 453         case 3:
 454         default:
 455                 dev_priv->edp.lanes = 4;
 456                 break;
 457         }
 458         switch (edp_link_params->preemphasis) {
 459         case 0:
 460                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 461                 break;
 462         case 1:
 463                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 464                 break;
 465         case 2:
 466                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 467                 break;
 468         case 3:
 469                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 470                 break;
 471         }
 472         switch (edp_link_params->vswing) {
 473         case 0:
 474                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 475                 break;
 476         case 1:
 477                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 478                 break;
 479         case 2:
 480                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 481                 break;
 482         case 3:
 483                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 484                 break;
 485         }
 486 }
 487
 488 static void
 489 parse_device_mapping(struct drm_i915_private *dev_priv,
 490                        struct bdb_header *bdb)
 491 {
 492         struct bdb_general_definitions *p_defs;
 493         struct child_device_config *p_child, *child_dev_ptr;
 494         int i, child_device_num, count;
 495         u16     block_size;
 496
 497         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 498         if (!p_defs) {
 499                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 500                 return;
 501         }
 502         /* judge whether the size of child device meets the requirements.
 503          * If the child device size obtained from general definition block
 504          * is different with sizeof(struct child_device_config), skip the
 505          * parsing of sdvo device info
 506          */
 507         if (p_defs->child_dev_size != sizeof(*p_child)) {
 508                 /* different child dev size . Ignore it */
 509                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 510                 return;
 511         }
 512         /* get the block size of general definitions */
 513         block_size = get_blocksize(p_defs);
 514         /* get the number of child device */
 515         child_device_num = (block_size - sizeof(*p_defs)) /
 516                                 sizeof(*p_child);
 517         count = 0;
 518         /* get the number of child device that is present */
 519         for (i = 0; i < child_device_num; i++) {
 520                 p_child = &(p_defs->devices[i]);
 521                 if (!p_child->device_type) {
 522                         /* skip the device block if device type is invalid */
 523                         continue;
 524                 }
 525                 count++;
 526         }
 527         if (!count) {
 528                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 529                 return;
 530         }
 531         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 532         if (!dev_priv->child_dev) {
 533                 DRM_DEBUG_KMS("No memory space for child device\n");
 534                 return;
 535         }
 536
 537         dev_priv->child_dev_num = count;
 538         count = 0;
 539         for (i = 0; i < child_device_num; i++) {
 540                 p_child = &(p_defs->devices[i]);
 541                 if (!p_child->device_type) {
 542                         /* skip the device block if device type is invalid */
 543                         continue;
 544                 }
 545                 child_dev_ptr = dev_priv->child_dev + count;
 546                 count++;
 547                 memcpy((void *)child_dev_ptr, (void *)p_child,
 548                                         sizeof(*p_child));
 549         }
 550         return;
 551 }
 552
 553 static void
 554 init_vbt_defaults(struct drm_i915_private *dev_priv)
 555 {
 556         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 557
 558         /* LFP panel data */
 559         dev_priv->lvds_dither = 1;
 560         dev_priv->lvds_vbt = 0;
 561
 562         /* SDVO panel data */
 563         dev_priv->sdvo_lvds_vbt_mode = NULL;
 564
 565         /* general features */
 566         dev_priv->int_tv_support = 1;
 567         dev_priv->int_crt_support = 1;
 568         dev_priv->lvds_use_ssc = 0;
 569
 570         /* eDP data */
 571         dev_priv->edp.bpp = 18;
 572 }
 573
 574 /**
 575  * intel_parse_bios - find VBT and initialize settings from the BIOS
 576  * @dev: DRM device
 577  *
 578  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 579  * to appropriate values.
 580  *
 581  * Returns 0 on success, nonzero on failure.
 582  */
 583 bool
 584 intel_parse_bios(struct drm_device *dev)
 585 {
 586         struct drm_i915_private *dev_priv = dev->dev_private;
 587         struct pci_dev *pdev = dev->pdev;
 588         struct bdb_header *bdb = NULL;
 589         u8 __iomem *bios = NULL;
 590
 591         init_vbt_defaults(dev_priv);
 592
 593         /* XXX Should this validation be moved to intel_opregion.c? */
 594         if (dev_priv->opregion.vbt) {
 595                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 596                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 597                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
 598                                          vbt->signature);
 599                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 600                 } else
 601                         dev_priv->opregion.vbt = NULL;
 602         }
 603
 604         if (bdb == NULL) {
 605                 struct vbt_header *vbt = NULL;
 606                 size_t size;
 607                 int i;
 608
 609                 bios = pci_map_rom(pdev, &size);
 610                 if (!bios)
 611                         return -1;
 612
 613                 /* Scour memory looking for the VBT signature */
 614                 for (i = 0; i + 4 < size; i++) {
 615                         if (!memcmp(bios + i, "$VBT", 4)) {
 616                                 vbt = (struct vbt_header *)(bios + i);
 617                                 break;
 618                         }
 619                 }
 620
 621                 if (!vbt) {
 622                         DRM_ERROR("VBT signature missing\n");
 623                         pci_unmap_rom(pdev, bios);
 624                         return -1;
 625                 }
 626
 627                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 628         }
 629
 630         /* Grab useful general definitions */
 631         parse_general_features(dev_priv, bdb);
 632         parse_general_definitions(dev_priv, bdb);
 633         parse_lfp_panel_data(dev_priv, bdb);
 634         parse_sdvo_panel_data(dev_priv, bdb);
 635         parse_sdvo_device_mapping(dev_priv, bdb);
 636         parse_device_mapping(dev_priv, bdb);
 637         parse_driver_features(dev_priv, bdb);
 638         parse_edp(dev_priv, bdb);
 639
 640         if (bios)
 641                 pci_unmap_rom(pdev, bios);
 642
 643         return 0;
 644 }
 645
 646 /* Ensure that vital registers have been initialised, even if the BIOS
 647  * is absent or just failing to do its job.
 648  */
 649 void intel_setup_bios(struct drm_device *dev)
 650 {
 651         struct drm_i915_private *dev_priv = dev->dev_private;
 652
 653          /* Set the Panel Power On/Off timings if uninitialized. */
 654         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
 655                 /* Set T2 to 40ms and T5 to 200ms */
 656                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 657
 658                 /* Set T3 to 35ms and Tx to 200ms */
 659                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 660         }
 661 }