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                 dev_priv->display_clock_mode = general->display_clock_mode;
 313                 DRM_DEBUG_KMS("BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d\n",
 314                               dev_priv->int_tv_support,
 315                               dev_priv->int_crt_support,
 316                               dev_priv->lvds_use_ssc,
 317                               dev_priv->lvds_ssc_freq,
 318                               dev_priv->display_clock_mode);
 319         }
 320 }
 321
 322 static void
 323 parse_general_definitions(struct drm_i915_private *dev_priv,
 324                           struct bdb_header *bdb)
 325 {
 326         struct bdb_general_definitions *general;
 327
 328         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 329         if (general) {
 330                 u16 block_size = get_blocksize(general);
 331                 if (block_size >= sizeof(*general)) {
 332                         int bus_pin = general->crt_ddc_gmbus_pin;
 333                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 334                         if (bus_pin >= 1 && bus_pin <= 6)
 335                                 dev_priv->crt_ddc_pin = bus_pin;
 336                 } else {
 337                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 338                                   block_size);
 339                 }
 340         }
 341 }
 342
 343 static void
 344 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 345                           struct bdb_header *bdb)
 346 {
 347         struct sdvo_device_mapping *p_mapping;
 348         struct bdb_general_definitions *p_defs;
 349         struct child_device_config *p_child;
 350         int i, child_device_num, count;
 351         u16     block_size;
 352
 353         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 354         if (!p_defs) {
 355                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 356                 return;
 357         }
 358         /* judge whether the size of child device meets the requirements.
 359          * If the child device size obtained from general definition block
 360          * is different with sizeof(struct child_device_config), skip the
 361          * parsing of sdvo device info
 362          */
 363         if (p_defs->child_dev_size != sizeof(*p_child)) {
 364                 /* different child dev size . Ignore it */
 365                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 366                 return;
 367         }
 368         /* get the block size of general definitions */
 369         block_size = get_blocksize(p_defs);
 370         /* get the number of child device */
 371         child_device_num = (block_size - sizeof(*p_defs)) /
 372                                 sizeof(*p_child);
 373         count = 0;
 374         for (i = 0; i < child_device_num; i++) {
 375                 p_child = &(p_defs->devices[i]);
 376                 if (!p_child->device_type) {
 377                         /* skip the device block if device type is invalid */
 378                         continue;
 379                 }
 380                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 381                         p_child->slave_addr != SLAVE_ADDR2) {
 382                         /*
 383                          * If the slave address is neither 0x70 nor 0x72,
 384                          * it is not a SDVO device. Skip it.
 385                          */
 386                         continue;
 387                 }
 388                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 389                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 390                         /* skip the incorrect SDVO port */
 391                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 392                         continue;
 393                 }
 394                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 395                                 " %s port\n",
 396                                 p_child->slave_addr,
 397                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 398                                         "SDVOB" : "SDVOC");
 399                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 400                 if (!p_mapping->initialized) {
 401                         p_mapping->dvo_port = p_child->dvo_port;
 402                         p_mapping->slave_addr = p_child->slave_addr;
 403                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 404                         p_mapping->ddc_pin = p_child->ddc_pin;
 405                         p_mapping->i2c_pin = p_child->i2c_pin;
 406                         p_mapping->initialized = 1;
 407                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 408                                       p_mapping->dvo_port,
 409                                       p_mapping->slave_addr,
 410                                       p_mapping->dvo_wiring,
 411                                       p_mapping->ddc_pin,
 412                                       p_mapping->i2c_pin);
 413                 } else {
 414                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 415                                          "two SDVO device.\n");
 416                 }
 417                 if (p_child->slave2_addr) {
 418                         /* Maybe this is a SDVO device with multiple inputs */
 419                         /* And the mapping info is not added */
 420                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 421                                 " is a SDVO device with multiple inputs.\n");
 422                 }
 423                 count++;
 424         }
 425
 426         if (!count) {
 427                 /* No SDVO device info is found */
 428                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 429         }
 430         return;
 431 }
 432
 433 static void
 434 parse_driver_features(struct drm_i915_private *dev_priv,
 435                        struct bdb_header *bdb)
 436 {
 437         struct drm_device *dev = dev_priv->dev;
 438         struct bdb_driver_features *driver;
 439
 440         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 441         if (!driver)
 442                 return;
 443
 444         if (SUPPORTS_EDP(dev) &&
 445             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 446                 dev_priv->edp.support = 1;
 447
 448         if (driver->dual_frequency)
 449                 dev_priv->render_reclock_avail = true;
 450 }
 451
 452 static void
 453 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 454 {
 455         struct bdb_edp *edp;
 456         struct edp_power_seq *edp_pps;
 457         struct edp_link_params *edp_link_params;
 458
 459         edp = find_section(bdb, BDB_EDP);
 460         if (!edp) {
 461                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
 462                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 463                                       "supported, assume %dbpp panel color "
 464                                       "depth.\n",
 465                                       dev_priv->edp.bpp);
 466                 }
 467                 return;
 468         }
 469
 470         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 471         case EDP_18BPP:
 472                 dev_priv->edp.bpp = 18;
 473                 break;
 474         case EDP_24BPP:
 475                 dev_priv->edp.bpp = 24;
 476                 break;
 477         case EDP_30BPP:
 478                 dev_priv->edp.bpp = 30;
 479                 break;
 480         }
 481
 482         /* Get the eDP sequencing and link info */
 483         edp_pps = &edp->power_seqs[panel_type];
 484         edp_link_params = &edp->link_params[panel_type];
 485
 486         dev_priv->edp.pps = *edp_pps;
 487
 488         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 489                 DP_LINK_BW_1_62;
 490         switch (edp_link_params->lanes) {
 491         case 0:
 492                 dev_priv->edp.lanes = 1;
 493                 break;
 494         case 1:
 495                 dev_priv->edp.lanes = 2;
 496                 break;
 497         case 3:
 498         default:
 499                 dev_priv->edp.lanes = 4;
 500                 break;
 501         }
 502         switch (edp_link_params->preemphasis) {
 503         case 0:
 504                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 505                 break;
 506         case 1:
 507                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 508                 break;
 509         case 2:
 510                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 511                 break;
 512         case 3:
 513                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 514                 break;
 515         }
 516         switch (edp_link_params->vswing) {
 517         case 0:
 518                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 519                 break;
 520         case 1:
 521                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 522                 break;
 523         case 2:
 524                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 525                 break;
 526         case 3:
 527                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 528                 break;
 529         }
 530 }
 531
 532 static void
 533 parse_device_mapping(struct drm_i915_private *dev_priv,
 534                        struct bdb_header *bdb)
 535 {
 536         struct bdb_general_definitions *p_defs;
 537         struct child_device_config *p_child, *child_dev_ptr;
 538         int i, child_device_num, count;
 539         u16     block_size;
 540
 541         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 542         if (!p_defs) {
 543                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 544                 return;
 545         }
 546         /* judge whether the size of child device meets the requirements.
 547          * If the child device size obtained from general definition block
 548          * is different with sizeof(struct child_device_config), skip the
 549          * parsing of sdvo device info
 550          */
 551         if (p_defs->child_dev_size != sizeof(*p_child)) {
 552                 /* different child dev size . Ignore it */
 553                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 554                 return;
 555         }
 556         /* get the block size of general definitions */
 557         block_size = get_blocksize(p_defs);
 558         /* get the number of child device */
 559         child_device_num = (block_size - sizeof(*p_defs)) /
 560                                 sizeof(*p_child);
 561         count = 0;
 562         /* get the number of child device that is present */
 563         for (i = 0; i < child_device_num; i++) {
 564                 p_child = &(p_defs->devices[i]);
 565                 if (!p_child->device_type) {
 566                         /* skip the device block if device type is invalid */
 567                         continue;
 568                 }
 569                 count++;
 570         }
 571         if (!count) {
 572                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 573                 return;
 574         }
 575         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 576         if (!dev_priv->child_dev) {
 577                 DRM_DEBUG_KMS("No memory space for child device\n");
 578                 return;
 579         }
 580
 581         dev_priv->child_dev_num = count;
 582         count = 0;
 583         for (i = 0; i < child_device_num; i++) {
 584                 p_child = &(p_defs->devices[i]);
 585                 if (!p_child->device_type) {
 586                         /* skip the device block if device type is invalid */
 587                         continue;
 588                 }
 589                 child_dev_ptr = dev_priv->child_dev + count;
 590                 count++;
 591                 memcpy((void *)child_dev_ptr, (void *)p_child,
 592                                         sizeof(*p_child));
 593         }
 594         return;
 595 }
 596
 597 static void
 598 init_vbt_defaults(struct drm_i915_private *dev_priv)
 599 {
 600         struct drm_device *dev = dev_priv->dev;
 601
 602         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 603
 604         /* LFP panel data */
 605         dev_priv->lvds_dither = 1;
 606         dev_priv->lvds_vbt = 0;
 607
 608         /* SDVO panel data */
 609         dev_priv->sdvo_lvds_vbt_mode = NULL;
 610
 611         /* general features */
 612         dev_priv->int_tv_support = 1;
 613         dev_priv->int_crt_support = 1;
 614
 615         /* Default to using SSC */
 616         dev_priv->lvds_use_ssc = 1;
 617         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
 618         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
 619
 620         /* eDP data */
 621         dev_priv->edp.bpp = 18;
 622 }
 623
 624 /**
 625  * intel_parse_bios - find VBT and initialize settings from the BIOS
 626  * @dev: DRM device
 627  *
 628  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 629  * to appropriate values.
 630  *
 631  * Returns 0 on success, nonzero on failure.
 632  */
 633 bool
 634 intel_parse_bios(struct drm_device *dev)
 635 {
 636         struct drm_i915_private *dev_priv = dev->dev_private;
 637         struct pci_dev *pdev = dev->pdev;
 638         struct bdb_header *bdb = NULL;
 639         u8 __iomem *bios = NULL;
 640
 641         init_vbt_defaults(dev_priv);
 642
 643         /* XXX Should this validation be moved to intel_opregion.c? */
 644         if (dev_priv->opregion.vbt) {
 645                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 646                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 647                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 648                                          vbt->signature);
 649                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 650                 } else
 651                         dev_priv->opregion.vbt = NULL;
 652         }
 653
 654         if (bdb == NULL) {
 655                 struct vbt_header *vbt = NULL;
 656                 size_t size;
 657                 int i;
 658
 659                 bios = pci_map_rom(pdev, &size);
 660                 if (!bios)
 661                         return -1;
 662
 663                 /* Scour memory looking for the VBT signature */
 664                 for (i = 0; i + 4 < size; i++) {
 665                         if (!memcmp(bios + i, "$VBT", 4)) {
 666                                 vbt = (struct vbt_header *)(bios + i);
 667                                 break;
 668                         }
 669                 }
 670
 671                 if (!vbt) {
 672                         DRM_ERROR("VBT signature missing\n");
 673                         pci_unmap_rom(pdev, bios);
 674                         return -1;
 675                 }
 676
 677                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 678         }
 679
 680         /* Grab useful general definitions */
 681         parse_general_features(dev_priv, bdb);
 682         parse_general_definitions(dev_priv, bdb);
 683         parse_lfp_panel_data(dev_priv, bdb);
 684         parse_sdvo_panel_data(dev_priv, bdb);
 685         parse_sdvo_device_mapping(dev_priv, bdb);
 686         parse_device_mapping(dev_priv, bdb);
 687         parse_driver_features(dev_priv, bdb);
 688         parse_edp(dev_priv, bdb);
 689
 690         if (bios)
 691                 pci_unmap_rom(pdev, bios);
 692
 693         return 0;
 694 }
 695
 696 /* Ensure that vital registers have been initialised, even if the BIOS
 697  * is absent or just failing to do its job.
 698  */
 699 void intel_setup_bios(struct drm_device *dev)
 700 {
 701         struct drm_i915_private *dev_priv = dev->dev_private;
 702
 703          /* Set the Panel Power On/Off timings if uninitialized. */
 704         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
 705                 /* Set T2 to 40ms and T5 to 200ms */
 706                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 707
 708                 /* Set T3 to 35ms and Tx to 200ms */
 709                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 710         }
 711 }