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 lvds_dvo_timing *dvo_timing;
 230         struct drm_display_mode *panel_fixed_mode;
 231         int index;
 232
 233         index = i915_vbt_sdvo_panel_type;
 234         if (index == -1) {
 235                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 236
 237                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 238                 if (!sdvo_lvds_options)
 239                         return;
 240
 241                 index = sdvo_lvds_options->panel_type;
 242         }
 243
 244         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 245         if (!dvo_timing)
 246                 return;
 247
 248         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 249         if (!panel_fixed_mode)
 250                 return;
 251
 252         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 253
 254         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 255
 256         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 257         drm_mode_debug_printmodeline(panel_fixed_mode);
 258 }
 259
 260 static int intel_bios_ssc_frequency(struct drm_device *dev,
 261                                     bool alternate)
 262 {
 263         switch (INTEL_INFO(dev)->gen) {
 264         case 2:
 265                 return alternate ? 66 : 48;
 266         case 3:
 267         case 4:
 268                 return alternate ? 100 : 96;
 269         default:
 270                 return alternate ? 100 : 120;
 271         }
 272 }
 273
 274 static void
 275 parse_general_features(struct drm_i915_private *dev_priv,
 276                        struct bdb_header *bdb)
 277 {
 278         struct drm_device *dev = dev_priv->dev;
 279         struct bdb_general_features *general;
 280
 281         general = find_section(bdb, BDB_GENERAL_FEATURES);
 282         if (general) {
 283                 dev_priv->int_tv_support = general->int_tv_support;
 284                 dev_priv->int_crt_support = general->int_crt_support;
 285                 dev_priv->lvds_use_ssc = general->enable_ssc;
 286                 dev_priv->lvds_ssc_freq =
 287                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 288         }
 289 }
 290
 291 static void
 292 parse_general_definitions(struct drm_i915_private *dev_priv,
 293                           struct bdb_header *bdb)
 294 {
 295         struct bdb_general_definitions *general;
 296
 297         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 298         if (general) {
 299                 u16 block_size = get_blocksize(general);
 300                 if (block_size >= sizeof(*general)) {
 301                         int bus_pin = general->crt_ddc_gmbus_pin;
 302                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 303                         if (bus_pin >= 1 && bus_pin <= 6)
 304                                 dev_priv->crt_ddc_pin = bus_pin;
 305                 } else {
 306                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 307                                   block_size);
 308                 }
 309         }
 310 }
 311
 312 static void
 313 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 314                           struct bdb_header *bdb)
 315 {
 316         struct sdvo_device_mapping *p_mapping;
 317         struct bdb_general_definitions *p_defs;
 318         struct child_device_config *p_child;
 319         int i, child_device_num, count;
 320         u16     block_size;
 321
 322         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 323         if (!p_defs) {
 324                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 325                 return;
 326         }
 327         /* judge whether the size of child device meets the requirements.
 328          * If the child device size obtained from general definition block
 329          * is different with sizeof(struct child_device_config), skip the
 330          * parsing of sdvo device info
 331          */
 332         if (p_defs->child_dev_size != sizeof(*p_child)) {
 333                 /* different child dev size . Ignore it */
 334                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 335                 return;
 336         }
 337         /* get the block size of general definitions */
 338         block_size = get_blocksize(p_defs);
 339         /* get the number of child device */
 340         child_device_num = (block_size - sizeof(*p_defs)) /
 341                                 sizeof(*p_child);
 342         count = 0;
 343         for (i = 0; i < child_device_num; i++) {
 344                 p_child = &(p_defs->devices[i]);
 345                 if (!p_child->device_type) {
 346                         /* skip the device block if device type is invalid */
 347                         continue;
 348                 }
 349                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 350                         p_child->slave_addr != SLAVE_ADDR2) {
 351                         /*
 352                          * If the slave address is neither 0x70 nor 0x72,
 353                          * it is not a SDVO device. Skip it.
 354                          */
 355                         continue;
 356                 }
 357                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 358                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 359                         /* skip the incorrect SDVO port */
 360                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 361                         continue;
 362                 }
 363                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 364                                 " %s port\n",
 365                                 p_child->slave_addr,
 366                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 367                                         "SDVOB" : "SDVOC");
 368                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 369                 if (!p_mapping->initialized) {
 370                         p_mapping->dvo_port = p_child->dvo_port;
 371                         p_mapping->slave_addr = p_child->slave_addr;
 372                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 373                         p_mapping->ddc_pin = p_child->ddc_pin;
 374                         p_mapping->i2c_pin = p_child->i2c_pin;
 375                         p_mapping->i2c_speed = p_child->i2c_speed;
 376                         p_mapping->initialized = 1;
 377                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
 378                                       p_mapping->dvo_port,
 379                                       p_mapping->slave_addr,
 380                                       p_mapping->dvo_wiring,
 381                                       p_mapping->ddc_pin,
 382                                       p_mapping->i2c_pin,
 383                                       p_mapping->i2c_speed);
 384                 } else {
 385                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 386                                          "two SDVO device.\n");
 387                 }
 388                 if (p_child->slave2_addr) {
 389                         /* Maybe this is a SDVO device with multiple inputs */
 390                         /* And the mapping info is not added */
 391                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 392                                 " is a SDVO device with multiple inputs.\n");
 393                 }
 394                 count++;
 395         }
 396
 397         if (!count) {
 398                 /* No SDVO device info is found */
 399                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 400         }
 401         return;
 402 }
 403
 404 static void
 405 parse_driver_features(struct drm_i915_private *dev_priv,
 406                        struct bdb_header *bdb)
 407 {
 408         struct drm_device *dev = dev_priv->dev;
 409         struct bdb_driver_features *driver;
 410
 411         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 412         if (!driver)
 413                 return;
 414
 415         if (SUPPORTS_EDP(dev) &&
 416             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 417                 dev_priv->edp.support = 1;
 418
 419         if (driver->dual_frequency)
 420                 dev_priv->render_reclock_avail = true;
 421 }
 422
 423 static void
 424 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 425 {
 426         struct bdb_edp *edp;
 427         struct edp_power_seq *edp_pps;
 428         struct edp_link_params *edp_link_params;
 429
 430         edp = find_section(bdb, BDB_EDP);
 431         if (!edp) {
 432                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
 433                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 434                                       "supported, assume %dbpp panel color "
 435                                       "depth.\n",
 436                                       dev_priv->edp.bpp);
 437                 }
 438                 return;
 439         }
 440
 441         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 442         case EDP_18BPP:
 443                 dev_priv->edp.bpp = 18;
 444                 break;
 445         case EDP_24BPP:
 446                 dev_priv->edp.bpp = 24;
 447                 break;
 448         case EDP_30BPP:
 449                 dev_priv->edp.bpp = 30;
 450                 break;
 451         }
 452
 453         /* Get the eDP sequencing and link info */
 454         edp_pps = &edp->power_seqs[panel_type];
 455         edp_link_params = &edp->link_params[panel_type];
 456
 457         dev_priv->edp.pps = *edp_pps;
 458
 459         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 460                 DP_LINK_BW_1_62;
 461         switch (edp_link_params->lanes) {
 462         case 0:
 463                 dev_priv->edp.lanes = 1;
 464                 break;
 465         case 1:
 466                 dev_priv->edp.lanes = 2;
 467                 break;
 468         case 3:
 469         default:
 470                 dev_priv->edp.lanes = 4;
 471                 break;
 472         }
 473         switch (edp_link_params->preemphasis) {
 474         case 0:
 475                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 476                 break;
 477         case 1:
 478                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 479                 break;
 480         case 2:
 481                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 482                 break;
 483         case 3:
 484                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 485                 break;
 486         }
 487         switch (edp_link_params->vswing) {
 488         case 0:
 489                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 490                 break;
 491         case 1:
 492                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 493                 break;
 494         case 2:
 495                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 496                 break;
 497         case 3:
 498                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 499                 break;
 500         }
 501 }
 502
 503 static void
 504 parse_device_mapping(struct drm_i915_private *dev_priv,
 505                        struct bdb_header *bdb)
 506 {
 507         struct bdb_general_definitions *p_defs;
 508         struct child_device_config *p_child, *child_dev_ptr;
 509         int i, child_device_num, count;
 510         u16     block_size;
 511
 512         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 513         if (!p_defs) {
 514                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 515                 return;
 516         }
 517         /* judge whether the size of child device meets the requirements.
 518          * If the child device size obtained from general definition block
 519          * is different with sizeof(struct child_device_config), skip the
 520          * parsing of sdvo device info
 521          */
 522         if (p_defs->child_dev_size != sizeof(*p_child)) {
 523                 /* different child dev size . Ignore it */
 524                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 525                 return;
 526         }
 527         /* get the block size of general definitions */
 528         block_size = get_blocksize(p_defs);
 529         /* get the number of child device */
 530         child_device_num = (block_size - sizeof(*p_defs)) /
 531                                 sizeof(*p_child);
 532         count = 0;
 533         /* get the number of child device that is present */
 534         for (i = 0; i < child_device_num; i++) {
 535                 p_child = &(p_defs->devices[i]);
 536                 if (!p_child->device_type) {
 537                         /* skip the device block if device type is invalid */
 538                         continue;
 539                 }
 540                 count++;
 541         }
 542         if (!count) {
 543                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 544                 return;
 545         }
 546         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 547         if (!dev_priv->child_dev) {
 548                 DRM_DEBUG_KMS("No memory space for child device\n");
 549                 return;
 550         }
 551
 552         dev_priv->child_dev_num = count;
 553         count = 0;
 554         for (i = 0; i < child_device_num; i++) {
 555                 p_child = &(p_defs->devices[i]);
 556                 if (!p_child->device_type) {
 557                         /* skip the device block if device type is invalid */
 558                         continue;
 559                 }
 560                 child_dev_ptr = dev_priv->child_dev + count;
 561                 count++;
 562                 memcpy((void *)child_dev_ptr, (void *)p_child,
 563                                         sizeof(*p_child));
 564         }
 565         return;
 566 }
 567
 568 static void
 569 init_vbt_defaults(struct drm_i915_private *dev_priv)
 570 {
 571         struct drm_device *dev = dev_priv->dev;
 572
 573         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 574
 575         /* LFP panel data */
 576         dev_priv->lvds_dither = 1;
 577         dev_priv->lvds_vbt = 0;
 578
 579         /* SDVO panel data */
 580         dev_priv->sdvo_lvds_vbt_mode = NULL;
 581
 582         /* general features */
 583         dev_priv->int_tv_support = 1;
 584         dev_priv->int_crt_support = 1;
 585
 586         /* Default to using SSC */
 587         dev_priv->lvds_use_ssc = 1;
 588         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
 589         DRM_DEBUG("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
 590
 591         /* eDP data */
 592         dev_priv->edp.bpp = 18;
 593 }
 594
 595 /**
 596  * intel_parse_bios - find VBT and initialize settings from the BIOS
 597  * @dev: DRM device
 598  *
 599  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 600  * to appropriate values.
 601  *
 602  * Returns 0 on success, nonzero on failure.
 603  */
 604 bool
 605 intel_parse_bios(struct drm_device *dev)
 606 {
 607         struct drm_i915_private *dev_priv = dev->dev_private;
 608         struct pci_dev *pdev = dev->pdev;
 609         struct bdb_header *bdb = NULL;
 610         u8 __iomem *bios = NULL;
 611
 612         init_vbt_defaults(dev_priv);
 613
 614         /* XXX Should this validation be moved to intel_opregion.c? */
 615         if (dev_priv->opregion.vbt) {
 616                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 617                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 618                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
 619                                          vbt->signature);
 620                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 621                 } else
 622                         dev_priv->opregion.vbt = NULL;
 623         }
 624
 625         if (bdb == NULL) {
 626                 struct vbt_header *vbt = NULL;
 627                 size_t size;
 628                 int i;
 629
 630                 bios = pci_map_rom(pdev, &size);
 631                 if (!bios)
 632                         return -1;
 633
 634                 /* Scour memory looking for the VBT signature */
 635                 for (i = 0; i + 4 < size; i++) {
 636                         if (!memcmp(bios + i, "$VBT", 4)) {
 637                                 vbt = (struct vbt_header *)(bios + i);
 638                                 break;
 639                         }
 640                 }
 641
 642                 if (!vbt) {
 643                         DRM_ERROR("VBT signature missing\n");
 644                         pci_unmap_rom(pdev, bios);
 645                         return -1;
 646                 }
 647
 648                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 649         }
 650
 651         /* Grab useful general definitions */
 652         parse_general_features(dev_priv, bdb);
 653         parse_general_definitions(dev_priv, bdb);
 654         parse_lfp_panel_data(dev_priv, bdb);
 655         parse_sdvo_panel_data(dev_priv, bdb);
 656         parse_sdvo_device_mapping(dev_priv, bdb);
 657         parse_device_mapping(dev_priv, bdb);
 658         parse_driver_features(dev_priv, bdb);
 659         parse_edp(dev_priv, bdb);
 660
 661         if (bios)
 662                 pci_unmap_rom(pdev, bios);
 663
 664         return 0;
 665 }
 666
 667 /* Ensure that vital registers have been initialised, even if the BIOS
 668  * is absent or just failing to do its job.
 669  */
 670 void intel_setup_bios(struct drm_device *dev)
 671 {
 672         struct drm_i915_private *dev_priv = dev->dev_private;
 673
 674          /* Set the Panel Power On/Off timings if uninitialized. */
 675         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
 676                 /* Set T2 to 40ms and T5 to 200ms */
 677                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 678
 679                 /* Set T3 to 35ms and Tx to 200ms */
 680                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 681         }
 682 }