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 (dev_priv->lvds_use_ssc) {
 268                         if (IS_I85X(dev_priv->dev))
 269                                 dev_priv->lvds_ssc_freq =
 270                                         general->ssc_freq ? 66 : 48;
 271                         else if (IS_IRONLAKE(dev_priv->dev) || IS_GEN6(dev))
 272                                 dev_priv->lvds_ssc_freq =
 273                                         general->ssc_freq ? 100 : 120;
 274                         else
 275                                 dev_priv->lvds_ssc_freq =
 276                                         general->ssc_freq ? 100 : 96;
 277                 }
 278         }
 279 }
 280
 281 static void
 282 parse_general_definitions(struct drm_i915_private *dev_priv,
 283                           struct bdb_header *bdb)
 284 {
 285         struct bdb_general_definitions *general;
 286
 287         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 288         if (general) {
 289                 u16 block_size = get_blocksize(general);
 290                 if (block_size >= sizeof(*general)) {
 291                         int bus_pin = general->crt_ddc_gmbus_pin;
 292                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 293                         if (bus_pin >= 1 && bus_pin <= 6)
 294                                 dev_priv->crt_ddc_pin = bus_pin;
 295                 } else {
 296                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 297                                   block_size);
 298                 }
 299         }
 300 }
 301
 302 static void
 303 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 304                           struct bdb_header *bdb)
 305 {
 306         struct sdvo_device_mapping *p_mapping;
 307         struct bdb_general_definitions *p_defs;
 308         struct child_device_config *p_child;
 309         int i, child_device_num, count;
 310         u16     block_size;
 311
 312         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 313         if (!p_defs) {
 314                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 315                 return;
 316         }
 317         /* judge whether the size of child device meets the requirements.
 318          * If the child device size obtained from general definition block
 319          * is different with sizeof(struct child_device_config), skip the
 320          * parsing of sdvo device info
 321          */
 322         if (p_defs->child_dev_size != sizeof(*p_child)) {
 323                 /* different child dev size . Ignore it */
 324                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 325                 return;
 326         }
 327         /* get the block size of general definitions */
 328         block_size = get_blocksize(p_defs);
 329         /* get the number of child device */
 330         child_device_num = (block_size - sizeof(*p_defs)) /
 331                                 sizeof(*p_child);
 332         count = 0;
 333         for (i = 0; i < child_device_num; i++) {
 334                 p_child = &(p_defs->devices[i]);
 335                 if (!p_child->device_type) {
 336                         /* skip the device block if device type is invalid */
 337                         continue;
 338                 }
 339                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 340                         p_child->slave_addr != SLAVE_ADDR2) {
 341                         /*
 342                          * If the slave address is neither 0x70 nor 0x72,
 343                          * it is not a SDVO device. Skip it.
 344                          */
 345                         continue;
 346                 }
 347                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 348                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 349                         /* skip the incorrect SDVO port */
 350                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 351                         continue;
 352                 }
 353                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 354                                 " %s port\n",
 355                                 p_child->slave_addr,
 356                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 357                                         "SDVOB" : "SDVOC");
 358                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 359                 if (!p_mapping->initialized) {
 360                         p_mapping->dvo_port = p_child->dvo_port;
 361                         p_mapping->slave_addr = p_child->slave_addr;
 362                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 363                         p_mapping->ddc_pin = p_child->ddc_pin;
 364                         p_mapping->i2c_pin = p_child->i2c_pin;
 365                         p_mapping->i2c_speed = p_child->i2c_speed;
 366                         p_mapping->initialized = 1;
 367                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
 368                                       p_mapping->dvo_port,
 369                                       p_mapping->slave_addr,
 370                                       p_mapping->dvo_wiring,
 371                                       p_mapping->ddc_pin,
 372                                       p_mapping->i2c_pin,
 373                                       p_mapping->i2c_speed);
 374                 } else {
 375                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 376                                          "two SDVO device.\n");
 377                 }
 378                 if (p_child->slave2_addr) {
 379                         /* Maybe this is a SDVO device with multiple inputs */
 380                         /* And the mapping info is not added */
 381                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 382                                 " is a SDVO device with multiple inputs.\n");
 383                 }
 384                 count++;
 385         }
 386
 387         if (!count) {
 388                 /* No SDVO device info is found */
 389                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 390         }
 391         return;
 392 }
 393
 394 static void
 395 parse_driver_features(struct drm_i915_private *dev_priv,
 396                        struct bdb_header *bdb)
 397 {
 398         struct drm_device *dev = dev_priv->dev;
 399         struct bdb_driver_features *driver;
 400
 401         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 402         if (!driver)
 403                 return;
 404
 405         if (SUPPORTS_EDP(dev) &&
 406             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 407                 dev_priv->edp.support = 1;
 408
 409         if (driver->dual_frequency)
 410                 dev_priv->render_reclock_avail = true;
 411 }
 412
 413 static void
 414 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 415 {
 416         struct bdb_edp *edp;
 417         struct edp_power_seq *edp_pps;
 418         struct edp_link_params *edp_link_params;
 419
 420         edp = find_section(bdb, BDB_EDP);
 421         if (!edp) {
 422                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
 423                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 424                                       "supported, assume %dbpp panel color "
 425                                       "depth.\n",
 426                                       dev_priv->edp.bpp);
 427                 }
 428                 return;
 429         }
 430
 431         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 432         case EDP_18BPP:
 433                 dev_priv->edp.bpp = 18;
 434                 break;
 435         case EDP_24BPP:
 436                 dev_priv->edp.bpp = 24;
 437                 break;
 438         case EDP_30BPP:
 439                 dev_priv->edp.bpp = 30;
 440                 break;
 441         }
 442
 443         /* Get the eDP sequencing and link info */
 444         edp_pps = &edp->power_seqs[panel_type];
 445         edp_link_params = &edp->link_params[panel_type];
 446
 447         dev_priv->edp.pps = *edp_pps;
 448
 449         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 450                 DP_LINK_BW_1_62;
 451         switch (edp_link_params->lanes) {
 452         case 0:
 453                 dev_priv->edp.lanes = 1;
 454                 break;
 455         case 1:
 456                 dev_priv->edp.lanes = 2;
 457                 break;
 458         case 3:
 459         default:
 460                 dev_priv->edp.lanes = 4;
 461                 break;
 462         }
 463         switch (edp_link_params->preemphasis) {
 464         case 0:
 465                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 466                 break;
 467         case 1:
 468                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 469                 break;
 470         case 2:
 471                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 472                 break;
 473         case 3:
 474                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 475                 break;
 476         }
 477         switch (edp_link_params->vswing) {
 478         case 0:
 479                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 480                 break;
 481         case 1:
 482                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 483                 break;
 484         case 2:
 485                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 486                 break;
 487         case 3:
 488                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 489                 break;
 490         }
 491 }
 492
 493 static void
 494 parse_device_mapping(struct drm_i915_private *dev_priv,
 495                        struct bdb_header *bdb)
 496 {
 497         struct bdb_general_definitions *p_defs;
 498         struct child_device_config *p_child, *child_dev_ptr;
 499         int i, child_device_num, count;
 500         u16     block_size;
 501
 502         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 503         if (!p_defs) {
 504                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 505                 return;
 506         }
 507         /* judge whether the size of child device meets the requirements.
 508          * If the child device size obtained from general definition block
 509          * is different with sizeof(struct child_device_config), skip the
 510          * parsing of sdvo device info
 511          */
 512         if (p_defs->child_dev_size != sizeof(*p_child)) {
 513                 /* different child dev size . Ignore it */
 514                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 515                 return;
 516         }
 517         /* get the block size of general definitions */
 518         block_size = get_blocksize(p_defs);
 519         /* get the number of child device */
 520         child_device_num = (block_size - sizeof(*p_defs)) /
 521                                 sizeof(*p_child);
 522         count = 0;
 523         /* get the number of child device that is present */
 524         for (i = 0; i < child_device_num; i++) {
 525                 p_child = &(p_defs->devices[i]);
 526                 if (!p_child->device_type) {
 527                         /* skip the device block if device type is invalid */
 528                         continue;
 529                 }
 530                 count++;
 531         }
 532         if (!count) {
 533                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 534                 return;
 535         }
 536         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 537         if (!dev_priv->child_dev) {
 538                 DRM_DEBUG_KMS("No memory space for child device\n");
 539                 return;
 540         }
 541
 542         dev_priv->child_dev_num = count;
 543         count = 0;
 544         for (i = 0; i < child_device_num; i++) {
 545                 p_child = &(p_defs->devices[i]);
 546                 if (!p_child->device_type) {
 547                         /* skip the device block if device type is invalid */
 548                         continue;
 549                 }
 550                 child_dev_ptr = dev_priv->child_dev + count;
 551                 count++;
 552                 memcpy((void *)child_dev_ptr, (void *)p_child,
 553                                         sizeof(*p_child));
 554         }
 555         return;
 556 }
 557
 558 static void
 559 init_vbt_defaults(struct drm_i915_private *dev_priv)
 560 {
 561         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 562
 563         /* LFP panel data */
 564         dev_priv->lvds_dither = 1;
 565         dev_priv->lvds_vbt = 0;
 566
 567         /* SDVO panel data */
 568         dev_priv->sdvo_lvds_vbt_mode = NULL;
 569
 570         /* general features */
 571         dev_priv->int_tv_support = 1;
 572         dev_priv->int_crt_support = 1;
 573         dev_priv->lvds_use_ssc = 0;
 574
 575         /* eDP data */
 576         dev_priv->edp.bpp = 18;
 577 }
 578
 579 /**
 580  * intel_init_bios - initialize VBIOS settings & find VBT
 581  * @dev: DRM device
 582  *
 583  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 584  * to appropriate values.
 585  *
 586  * Returns 0 on success, nonzero on failure.
 587  */
 588 bool
 589 intel_init_bios(struct drm_device *dev)
 590 {
 591         struct drm_i915_private *dev_priv = dev->dev_private;
 592         struct pci_dev *pdev = dev->pdev;
 593         struct bdb_header *bdb = NULL;
 594         u8 __iomem *bios = NULL;
 595
 596         init_vbt_defaults(dev_priv);
 597
 598         /* XXX Should this validation be moved to intel_opregion.c? */
 599         if (dev_priv->opregion.vbt) {
 600                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 601                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 602                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
 603                                          vbt->signature);
 604                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 605                 } else
 606                         dev_priv->opregion.vbt = NULL;
 607         }
 608
 609         if (bdb == NULL) {
 610                 struct vbt_header *vbt = NULL;
 611                 size_t size;
 612                 int i;
 613
 614                 bios = pci_map_rom(pdev, &size);
 615                 if (!bios)
 616                         return -1;
 617
 618                 /* Scour memory looking for the VBT signature */
 619                 for (i = 0; i + 4 < size; i++) {
 620                         if (!memcmp(bios + i, "$VBT", 4)) {
 621                                 vbt = (struct vbt_header *)(bios + i);
 622                                 break;
 623                         }
 624                 }
 625
 626                 if (!vbt) {
 627                         DRM_ERROR("VBT signature missing\n");
 628                         pci_unmap_rom(pdev, bios);
 629                         return -1;
 630                 }
 631
 632                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 633         }
 634
 635         /* Grab useful general definitions */
 636         parse_general_features(dev_priv, bdb);
 637         parse_general_definitions(dev_priv, bdb);
 638         parse_lfp_panel_data(dev_priv, bdb);
 639         parse_sdvo_panel_data(dev_priv, bdb);
 640         parse_sdvo_device_mapping(dev_priv, bdb);
 641         parse_device_mapping(dev_priv, bdb);
 642         parse_driver_features(dev_priv, bdb);
 643         parse_edp(dev_priv, bdb);
 644
 645         if (bios)
 646                 pci_unmap_rom(pdev, bios);
 647
 648         return 0;
 649 }