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                         const 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 static bool
 119 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
 120                            const struct lvds_dvo_timing *b)
 121 {
 122         if (a->hactive_hi != b->hactive_hi ||
 123             a->hactive_lo != b->hactive_lo)
 124                 return false;
 125
 126         if (a->hsync_off_hi != b->hsync_off_hi ||
 127             a->hsync_off_lo != b->hsync_off_lo)
 128                 return false;
 129
 130         if (a->hsync_pulse_width != b->hsync_pulse_width)
 131                 return false;
 132
 133         if (a->hblank_hi != b->hblank_hi ||
 134             a->hblank_lo != b->hblank_lo)
 135                 return false;
 136
 137         if (a->vactive_hi != b->vactive_hi ||
 138             a->vactive_lo != b->vactive_lo)
 139                 return false;
 140
 141         if (a->vsync_off != b->vsync_off)
 142                 return false;
 143
 144         if (a->vsync_pulse_width != b->vsync_pulse_width)
 145                 return false;
 146
 147         if (a->vblank_hi != b->vblank_hi ||
 148             a->vblank_lo != b->vblank_lo)
 149                 return false;
 150
 151         return true;
 152 }
 153
 154 static const struct lvds_dvo_timing *
 155 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 156                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 157                     int index)
 158 {
 159         /*
 160          * the size of fp_timing varies on the different platform.
 161          * So calculate the DVO timing relative offset in LVDS data
 162          * entry to get the DVO timing entry
 163          */
 164
 165         int lfp_data_size =
 166                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 167                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 168         int dvo_timing_offset =
 169                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 170                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 171         char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
 172
 173         return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 174 }
 175
 176 /* Try to find integrated panel data */
 177 static void
 178 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 179                             struct bdb_header *bdb)
 180 {
 181         const struct bdb_lvds_options *lvds_options;
 182         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 183         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 184         const struct lvds_dvo_timing *panel_dvo_timing;
 185         struct drm_display_mode *panel_fixed_mode;
 186         int i, downclock;
 187
 188         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 189         if (!lvds_options)
 190                 return;
 191
 192         dev_priv->lvds_dither = lvds_options->pixel_dither;
 193         if (lvds_options->panel_type == 0xff)
 194                 return;
 195
 196         panel_type = lvds_options->panel_type;
 197
 198         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 199         if (!lvds_lfp_data)
 200                 return;
 201
 202         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 203         if (!lvds_lfp_data_ptrs)
 204                 return;
 205
 206         dev_priv->lvds_vbt = 1;
 207
 208         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 209                                                lvds_lfp_data_ptrs,
 210                                                lvds_options->panel_type);
 211
 212         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 213         if (!panel_fixed_mode)
 214                 return;
 215
 216         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 217
 218         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 219
 220         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 221         drm_mode_debug_printmodeline(panel_fixed_mode);
 222
 223         /*
 224          * Iterate over the LVDS panel timing info to find the lowest clock
 225          * for the native resolution.
 226          */
 227         downclock = panel_dvo_timing->clock;
 228         for (i = 0; i < 16; i++) {
 229                 const struct lvds_dvo_timing *dvo_timing;
 230
 231                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 232                                                  lvds_lfp_data_ptrs,
 233                                                  i);
 234                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 235                     dvo_timing->clock < downclock)
 236                         downclock = dvo_timing->clock;
 237         }
 238
 239         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
 240                 dev_priv->lvds_downclock_avail = 1;
 241                 dev_priv->lvds_downclock = downclock * 10;
 242                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 243                               "Normal Clock %dKHz, downclock %dKHz\n",
 244                               panel_fixed_mode->clock, 10*downclock);
 245         }
 246 }
 247
 248 /* Try to find sdvo panel data */
 249 static void
 250 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 251                       struct bdb_header *bdb)
 252 {
 253         struct lvds_dvo_timing *dvo_timing;
 254         struct drm_display_mode *panel_fixed_mode;
 255         int index;
 256
 257         index = i915_vbt_sdvo_panel_type;
 258         if (index == -1) {
 259                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 260
 261                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 262                 if (!sdvo_lvds_options)
 263                         return;
 264
 265                 index = sdvo_lvds_options->panel_type;
 266         }
 267
 268         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 269         if (!dvo_timing)
 270                 return;
 271
 272         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 273         if (!panel_fixed_mode)
 274                 return;
 275
 276         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 277
 278         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 279
 280         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 281         drm_mode_debug_printmodeline(panel_fixed_mode);
 282 }
 283
 284 static int intel_bios_ssc_frequency(struct drm_device *dev,
 285                                     bool alternate)
 286 {
 287         switch (INTEL_INFO(dev)->gen) {
 288         case 2:
 289                 return alternate ? 66 : 48;
 290         case 3:
 291         case 4:
 292                 return alternate ? 100 : 96;
 293         default:
 294                 return alternate ? 100 : 120;
 295         }
 296 }
 297
 298 static void
 299 parse_general_features(struct drm_i915_private *dev_priv,
 300                        struct bdb_header *bdb)
 301 {
 302         struct drm_device *dev = dev_priv->dev;
 303         struct bdb_general_features *general;
 304
 305         general = find_section(bdb, BDB_GENERAL_FEATURES);
 306         if (general) {
 307                 dev_priv->int_tv_support = general->int_tv_support;
 308                 dev_priv->int_crt_support = general->int_crt_support;
 309                 dev_priv->lvds_use_ssc = general->enable_ssc;
 310                 dev_priv->lvds_ssc_freq =
 311                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 312         }
 313 }
 314
 315 static void
 316 parse_general_definitions(struct drm_i915_private *dev_priv,
 317                           struct bdb_header *bdb)
 318 {
 319         struct bdb_general_definitions *general;
 320
 321         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 322         if (general) {
 323                 u16 block_size = get_blocksize(general);
 324                 if (block_size >= sizeof(*general)) {
 325                         int bus_pin = general->crt_ddc_gmbus_pin;
 326                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 327                         if (bus_pin >= 1 && bus_pin <= 6)
 328                                 dev_priv->crt_ddc_pin = bus_pin;
 329                 } else {
 330                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 331                                   block_size);
 332                 }
 333         }
 334 }
 335
 336 static void
 337 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 338                           struct bdb_header *bdb)
 339 {
 340         struct sdvo_device_mapping *p_mapping;
 341         struct bdb_general_definitions *p_defs;
 342         struct child_device_config *p_child;
 343         int i, child_device_num, count;
 344         u16     block_size;
 345
 346         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 347         if (!p_defs) {
 348                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 349                 return;
 350         }
 351         /* judge whether the size of child device meets the requirements.
 352          * If the child device size obtained from general definition block
 353          * is different with sizeof(struct child_device_config), skip the
 354          * parsing of sdvo device info
 355          */
 356         if (p_defs->child_dev_size != sizeof(*p_child)) {
 357                 /* different child dev size . Ignore it */
 358                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 359                 return;
 360         }
 361         /* get the block size of general definitions */
 362         block_size = get_blocksize(p_defs);
 363         /* get the number of child device */
 364         child_device_num = (block_size - sizeof(*p_defs)) /
 365                                 sizeof(*p_child);
 366         count = 0;
 367         for (i = 0; i < child_device_num; i++) {
 368                 p_child = &(p_defs->devices[i]);
 369                 if (!p_child->device_type) {
 370                         /* skip the device block if device type is invalid */
 371                         continue;
 372                 }
 373                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 374                         p_child->slave_addr != SLAVE_ADDR2) {
 375                         /*
 376                          * If the slave address is neither 0x70 nor 0x72,
 377                          * it is not a SDVO device. Skip it.
 378                          */
 379                         continue;
 380                 }
 381                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 382                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 383                         /* skip the incorrect SDVO port */
 384                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 385                         continue;
 386                 }
 387                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 388                                 " %s port\n",
 389                                 p_child->slave_addr,
 390                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 391                                         "SDVOB" : "SDVOC");
 392                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 393                 if (!p_mapping->initialized) {
 394                         p_mapping->dvo_port = p_child->dvo_port;
 395                         p_mapping->slave_addr = p_child->slave_addr;
 396                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 397                         p_mapping->ddc_pin = p_child->ddc_pin;
 398                         p_mapping->i2c_pin = p_child->i2c_pin;
 399                         p_mapping->i2c_speed = p_child->i2c_speed;
 400                         p_mapping->initialized = 1;
 401                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
 402                                       p_mapping->dvo_port,
 403                                       p_mapping->slave_addr,
 404                                       p_mapping->dvo_wiring,
 405                                       p_mapping->ddc_pin,
 406                                       p_mapping->i2c_pin,
 407                                       p_mapping->i2c_speed);
 408                 } else {
 409                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 410                                          "two SDVO device.\n");
 411                 }
 412                 if (p_child->slave2_addr) {
 413                         /* Maybe this is a SDVO device with multiple inputs */
 414                         /* And the mapping info is not added */
 415                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 416                                 " is a SDVO device with multiple inputs.\n");
 417                 }
 418                 count++;
 419         }
 420
 421         if (!count) {
 422                 /* No SDVO device info is found */
 423                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 424         }
 425         return;
 426 }
 427
 428 static void
 429 parse_driver_features(struct drm_i915_private *dev_priv,
 430                        struct bdb_header *bdb)
 431 {
 432         struct drm_device *dev = dev_priv->dev;
 433         struct bdb_driver_features *driver;
 434
 435         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 436         if (!driver)
 437                 return;
 438
 439         if (SUPPORTS_EDP(dev) &&
 440             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 441                 dev_priv->edp.support = 1;
 442
 443         if (driver->dual_frequency)
 444                 dev_priv->render_reclock_avail = true;
 445 }
 446
 447 static void
 448 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 449 {
 450         struct bdb_edp *edp;
 451         struct edp_power_seq *edp_pps;
 452         struct edp_link_params *edp_link_params;
 453
 454         edp = find_section(bdb, BDB_EDP);
 455         if (!edp) {
 456                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
 457                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 458                                       "supported, assume %dbpp panel color "
 459                                       "depth.\n",
 460                                       dev_priv->edp.bpp);
 461                 }
 462                 return;
 463         }
 464
 465         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 466         case EDP_18BPP:
 467                 dev_priv->edp.bpp = 18;
 468                 break;
 469         case EDP_24BPP:
 470                 dev_priv->edp.bpp = 24;
 471                 break;
 472         case EDP_30BPP:
 473                 dev_priv->edp.bpp = 30;
 474                 break;
 475         }
 476
 477         /* Get the eDP sequencing and link info */
 478         edp_pps = &edp->power_seqs[panel_type];
 479         edp_link_params = &edp->link_params[panel_type];
 480
 481         dev_priv->edp.pps = *edp_pps;
 482
 483         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 484                 DP_LINK_BW_1_62;
 485         switch (edp_link_params->lanes) {
 486         case 0:
 487                 dev_priv->edp.lanes = 1;
 488                 break;
 489         case 1:
 490                 dev_priv->edp.lanes = 2;
 491                 break;
 492         case 3:
 493         default:
 494                 dev_priv->edp.lanes = 4;
 495                 break;
 496         }
 497         switch (edp_link_params->preemphasis) {
 498         case 0:
 499                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 500                 break;
 501         case 1:
 502                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 503                 break;
 504         case 2:
 505                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 506                 break;
 507         case 3:
 508                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 509                 break;
 510         }
 511         switch (edp_link_params->vswing) {
 512         case 0:
 513                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 514                 break;
 515         case 1:
 516                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 517                 break;
 518         case 2:
 519                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 520                 break;
 521         case 3:
 522                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 523                 break;
 524         }
 525 }
 526
 527 static void
 528 parse_device_mapping(struct drm_i915_private *dev_priv,
 529                        struct bdb_header *bdb)
 530 {
 531         struct bdb_general_definitions *p_defs;
 532         struct child_device_config *p_child, *child_dev_ptr;
 533         int i, child_device_num, count;
 534         u16     block_size;
 535
 536         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 537         if (!p_defs) {
 538                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 539                 return;
 540         }
 541         /* judge whether the size of child device meets the requirements.
 542          * If the child device size obtained from general definition block
 543          * is different with sizeof(struct child_device_config), skip the
 544          * parsing of sdvo device info
 545          */
 546         if (p_defs->child_dev_size != sizeof(*p_child)) {
 547                 /* different child dev size . Ignore it */
 548                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 549                 return;
 550         }
 551         /* get the block size of general definitions */
 552         block_size = get_blocksize(p_defs);
 553         /* get the number of child device */
 554         child_device_num = (block_size - sizeof(*p_defs)) /
 555                                 sizeof(*p_child);
 556         count = 0;
 557         /* get the number of child device that is present */
 558         for (i = 0; i < child_device_num; i++) {
 559                 p_child = &(p_defs->devices[i]);
 560                 if (!p_child->device_type) {
 561                         /* skip the device block if device type is invalid */
 562                         continue;
 563                 }
 564                 count++;
 565         }
 566         if (!count) {
 567                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 568                 return;
 569         }
 570         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 571         if (!dev_priv->child_dev) {
 572                 DRM_DEBUG_KMS("No memory space for child device\n");
 573                 return;
 574         }
 575
 576         dev_priv->child_dev_num = count;
 577         count = 0;
 578         for (i = 0; i < child_device_num; i++) {
 579                 p_child = &(p_defs->devices[i]);
 580                 if (!p_child->device_type) {
 581                         /* skip the device block if device type is invalid */
 582                         continue;
 583                 }
 584                 child_dev_ptr = dev_priv->child_dev + count;
 585                 count++;
 586                 memcpy((void *)child_dev_ptr, (void *)p_child,
 587                                         sizeof(*p_child));
 588         }
 589         return;
 590 }
 591
 592 static void
 593 init_vbt_defaults(struct drm_i915_private *dev_priv)
 594 {
 595         struct drm_device *dev = dev_priv->dev;
 596
 597         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 598
 599         /* LFP panel data */
 600         dev_priv->lvds_dither = 1;
 601         dev_priv->lvds_vbt = 0;
 602
 603         /* SDVO panel data */
 604         dev_priv->sdvo_lvds_vbt_mode = NULL;
 605
 606         /* general features */
 607         dev_priv->int_tv_support = 1;
 608         dev_priv->int_crt_support = 1;
 609
 610         /* Default to using SSC */
 611         dev_priv->lvds_use_ssc = 1;
 612         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
 613         DRM_DEBUG("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
 614
 615         /* eDP data */
 616         dev_priv->edp.bpp = 18;
 617 }
 618
 619 /**
 620  * intel_parse_bios - find VBT and initialize settings from the BIOS
 621  * @dev: DRM device
 622  *
 623  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 624  * to appropriate values.
 625  *
 626  * Returns 0 on success, nonzero on failure.
 627  */
 628 bool
 629 intel_parse_bios(struct drm_device *dev)
 630 {
 631         struct drm_i915_private *dev_priv = dev->dev_private;
 632         struct pci_dev *pdev = dev->pdev;
 633         struct bdb_header *bdb = NULL;
 634         u8 __iomem *bios = NULL;
 635
 636         init_vbt_defaults(dev_priv);
 637
 638         /* XXX Should this validation be moved to intel_opregion.c? */
 639         if (dev_priv->opregion.vbt) {
 640                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 641                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 642                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
 643                                          vbt->signature);
 644                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 645                 } else
 646                         dev_priv->opregion.vbt = NULL;
 647         }
 648
 649         if (bdb == NULL) {
 650                 struct vbt_header *vbt = NULL;
 651                 size_t size;
 652                 int i;
 653
 654                 bios = pci_map_rom(pdev, &size);
 655                 if (!bios)
 656                         return -1;
 657
 658                 /* Scour memory looking for the VBT signature */
 659                 for (i = 0; i + 4 < size; i++) {
 660                         if (!memcmp(bios + i, "$VBT", 4)) {
 661                                 vbt = (struct vbt_header *)(bios + i);
 662                                 break;
 663                         }
 664                 }
 665
 666                 if (!vbt) {
 667                         DRM_ERROR("VBT signature missing\n");
 668                         pci_unmap_rom(pdev, bios);
 669                         return -1;
 670                 }
 671
 672                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 673         }
 674
 675         /* Grab useful general definitions */
 676         parse_general_features(dev_priv, bdb);
 677         parse_general_definitions(dev_priv, bdb);
 678         parse_lfp_panel_data(dev_priv, bdb);
 679         parse_sdvo_panel_data(dev_priv, bdb);
 680         parse_sdvo_device_mapping(dev_priv, bdb);
 681         parse_device_mapping(dev_priv, bdb);
 682         parse_driver_features(dev_priv, bdb);
 683         parse_edp(dev_priv, bdb);
 684
 685         if (bios)
 686                 pci_unmap_rom(pdev, bios);
 687
 688         return 0;
 689 }
 690
 691 /* Ensure that vital registers have been initialised, even if the BIOS
 692  * is absent or just failing to do its job.
 693  */
 694 void intel_setup_bios(struct drm_device *dev)
 695 {
 696         struct drm_i915_private *dev_priv = dev->dev_private;
 697
 698          /* Set the Panel Power On/Off timings if uninitialized. */
 699         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
 700                 /* Set T2 to 40ms and T5 to 200ms */
 701                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 702
 703                 /* Set T3 to 35ms and Tx to 200ms */
 704                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 705         }
 706 }