sys/dev/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  * $FreeBSD: src/sys/dev/drm2/i915/intel_bios.c,v 1.1 2012/05/22 11:07:44 kib Exp $
  27  */
  28 #include <dev/drm/drmP.h>
  29 #include <dev/drm/drm.h>
  30 #include <dev/drm/drm_dp_helper.h>
  31 #include "i915_drm.h"
  32 #include "i915_drv.h"
  33 #include "intel_bios.h"
  34
  35 #define SLAVE_ADDR1     0x70
  36 #define SLAVE_ADDR2     0x72
  37
  38 static int panel_type;
  39
  40 static void *
  41 find_section(struct bdb_header *bdb, int section_id)
  42 {
  43         u8 *base = (u8 *)bdb;
  44         int index = 0;
  45         u16 total, current_size;
  46         u8 current_id;
  47
  48         /* skip to first section */
  49         index += bdb->header_size;
  50         total = bdb->bdb_size;
  51
  52         /* walk the sections looking for section_id */
  53         while (index < total) {
  54                 current_id = *(base + index);
  55                 index++;
  56                 current_size = *((u16 *)(base + index));
  57                 index += 2;
  58                 if (current_id == section_id)
  59                         return base + index;
  60                 index += current_size;
  61         }
  62
  63         return NULL;
  64 }
  65
  66 static u16
  67 get_blocksize(void *p)
  68 {
  69         u16 *block_ptr, block_size;
  70
  71         block_ptr = (u16 *)((char *)p - 2);
  72         block_size = *block_ptr;
  73         return block_size;
  74 }
  75
  76 static void
  77 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  78                         const struct lvds_dvo_timing *dvo_timing)
  79 {
  80         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  81                 dvo_timing->hactive_lo;
  82         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  83                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  84         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  85                 dvo_timing->hsync_pulse_width;
  86         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  87                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  88
  89         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  90                 dvo_timing->vactive_lo;
  91         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  92                 dvo_timing->vsync_off;
  93         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  94                 dvo_timing->vsync_pulse_width;
  95         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  96                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  97         panel_fixed_mode->clock = dvo_timing->clock * 10;
  98         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  99
 100         if (dvo_timing->hsync_positive)
 101                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 102         else
 103                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 104
 105         if (dvo_timing->vsync_positive)
 106                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 107         else
 108                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 109
 110         /* Some VBTs have bogus h/vtotal values */
 111         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 112                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 113         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 114                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 115
 116         drm_mode_set_name(panel_fixed_mode);
 117 }
 118
 119 static bool
 120 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
 121                            const struct lvds_dvo_timing *b)
 122 {
 123         if (a->hactive_hi != b->hactive_hi ||
 124             a->hactive_lo != b->hactive_lo)
 125                 return false;
 126
 127         if (a->hsync_off_hi != b->hsync_off_hi ||
 128             a->hsync_off_lo != b->hsync_off_lo)
 129                 return false;
 130
 131         if (a->hsync_pulse_width != b->hsync_pulse_width)
 132                 return false;
 133
 134         if (a->hblank_hi != b->hblank_hi ||
 135             a->hblank_lo != b->hblank_lo)
 136                 return false;
 137
 138         if (a->vactive_hi != b->vactive_hi ||
 139             a->vactive_lo != b->vactive_lo)
 140                 return false;
 141
 142         if (a->vsync_off != b->vsync_off)
 143                 return false;
 144
 145         if (a->vsync_pulse_width != b->vsync_pulse_width)
 146                 return false;
 147
 148         if (a->vblank_hi != b->vblank_hi ||
 149             a->vblank_lo != b->vblank_lo)
 150                 return false;
 151
 152         return true;
 153 }
 154
 155 static const struct lvds_dvo_timing *
 156 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 157                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 158                     int index)
 159 {
 160         /*
 161          * the size of fp_timing varies on the different platform.
 162          * So calculate the DVO timing relative offset in LVDS data
 163          * entry to get the DVO timing entry
 164          */
 165
 166         int lfp_data_size =
 167                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 168                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 169         int dvo_timing_offset =
 170                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 171                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 172         const char *entry = (const char *)lvds_lfp_data->data +
 173             lfp_data_size * index;
 174
 175         return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 176 }
 177
 178 /* Try to find integrated panel data */
 179 static void
 180 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 181                             struct bdb_header *bdb)
 182 {
 183         const struct bdb_lvds_options *lvds_options;
 184         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 185         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 186         const struct lvds_dvo_timing *panel_dvo_timing;
 187         struct drm_display_mode *panel_fixed_mode;
 188         int i, downclock;
 189
 190         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 191         if (!lvds_options)
 192                 return;
 193
 194         dev_priv->lvds_dither = lvds_options->pixel_dither;
 195         if (lvds_options->panel_type == 0xff)
 196                 return;
 197
 198         panel_type = lvds_options->panel_type;
 199
 200         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 201         if (!lvds_lfp_data)
 202                 return;
 203
 204         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 205         if (!lvds_lfp_data_ptrs)
 206                 return;
 207
 208         dev_priv->lvds_vbt = 1;
 209
 210         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 211                                                lvds_lfp_data_ptrs,
 212                                                lvds_options->panel_type);
 213
 214         panel_fixed_mode = kmalloc(sizeof(*panel_fixed_mode), DRM_MEM_KMS,
 215             M_WAITOK | M_ZERO);
 216
 217         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 218
 219         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 220
 221         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 222         drm_mode_debug_printmodeline(panel_fixed_mode);
 223
 224         /*
 225          * Iterate over the LVDS panel timing info to find the lowest clock
 226          * for the native resolution.
 227          */
 228         downclock = panel_dvo_timing->clock;
 229         for (i = 0; i < 16; i++) {
 230                 const struct lvds_dvo_timing *dvo_timing;
 231
 232                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 233                                                  lvds_lfp_data_ptrs,
 234                                                  i);
 235                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 236                     dvo_timing->clock < downclock)
 237                         downclock = dvo_timing->clock;
 238         }
 239
 240         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
 241                 dev_priv->lvds_downclock_avail = 1;
 242                 dev_priv->lvds_downclock = downclock * 10;
 243                 DRM_DEBUG("LVDS downclock is found in VBT. "
 244                               "Normal Clock %dKHz, downclock %dKHz\n",
 245                           panel_fixed_mode->clock, 10 * downclock);
 246         }
 247 }
 248
 249 /* Try to find sdvo panel data */
 250 static void
 251 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 252                       struct bdb_header *bdb)
 253 {
 254         struct lvds_dvo_timing *dvo_timing;
 255         struct drm_display_mode *panel_fixed_mode;
 256         int index;
 257
 258         index = i915_vbt_sdvo_panel_type;
 259         if (index == -1) {
 260                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 261
 262                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 263                 if (!sdvo_lvds_options)
 264                         return;
 265
 266                 index = sdvo_lvds_options->panel_type;
 267         }
 268
 269         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 270         if (!dvo_timing)
 271                 return;
 272
 273         panel_fixed_mode = kmalloc(sizeof(*panel_fixed_mode), DRM_MEM_KMS,
 274             M_WAITOK | M_ZERO);
 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 = kmalloc(sizeof(*p_child) * count, DRM_MEM_KMS,
 576             M_WAITOK | M_ZERO);
 577
 578         dev_priv->child_dev_num = count;
 579         count = 0;
 580         for (i = 0; i < child_device_num; i++) {
 581                 p_child = &(p_defs->devices[i]);
 582                 if (!p_child->device_type) {
 583                         /* skip the device block if device type is invalid */
 584                         continue;
 585                 }
 586                 child_dev_ptr = dev_priv->child_dev + count;
 587                 count++;
 588                 memcpy((void *)child_dev_ptr, (void *)p_child,
 589                                         sizeof(*p_child));
 590         }
 591         return;
 592 }
 593
 594 static void
 595 init_vbt_defaults(struct drm_i915_private *dev_priv)
 596 {
 597         struct drm_device *dev = dev_priv->dev;
 598
 599         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 600
 601         /* LFP panel data */
 602         dev_priv->lvds_dither = 1;
 603         dev_priv->lvds_vbt = 0;
 604
 605         /* SDVO panel data */
 606         dev_priv->sdvo_lvds_vbt_mode = NULL;
 607
 608         /* general features */
 609         dev_priv->int_tv_support = 1;
 610         dev_priv->int_crt_support = 1;
 611
 612         /* Default to using SSC */
 613         dev_priv->lvds_use_ssc = 1;
 614         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
 615         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
 616
 617         /* eDP data */
 618         dev_priv->edp.bpp = 18;
 619 }
 620
 621 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 622 {
 623         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 624                       "VBIOS ROM for %s\n",
 625                       id->ident);
 626         return 1;
 627 }
 628
 629 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 630         {
 631                 .callback = intel_no_opregion_vbt_callback,
 632                 .ident = "ThinkCentre A57",
 633                 .matches = {
 634                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 635                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 636                 },
 637         },
 638         { }
 639 };
 640
 641 /**
 642  * intel_parse_bios - find VBT and initialize settings from the BIOS
 643  * @dev: DRM device
 644  *
 645  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 646  * to appropriate values.
 647  *
 648  * Returns 0 on success, nonzero on failure.
 649  */
 650 bool
 651 intel_parse_bios(struct drm_device *dev)
 652 {
 653         struct drm_i915_private *dev_priv = dev->dev_private;
 654         struct bdb_header *bdb = NULL;
 655         u8 *bios;
 656
 657         init_vbt_defaults(dev_priv);
 658
 659         /* XXX Should this validation be moved to intel_opregion.c? */
 660         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 661                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 662                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 663                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 664                                          vbt->signature);
 665                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 666                 } else
 667                         dev_priv->opregion.vbt = NULL;
 668         }
 669         bios = NULL;
 670
 671 #if 1
 672         if (bdb == NULL) {
 673                 KIB_NOTYET();
 674                 return (-1);
 675         }
 676 #else
 677         if (bdb == NULL) {
 678                 struct vbt_header *vbt = NULL;
 679                 size_t size;
 680                 int i;
 681
 682                 bios = pci_map_rom(pdev, &size);
 683                 if (!bios)
 684                         return -1;
 685
 686                 /* Scour memory looking for the VBT signature */
 687                 for (i = 0; i + 4 < size; i++) {
 688                         if (!memcmp(bios + i, "$VBT", 4)) {
 689                                 vbt = (struct vbt_header *)(bios + i);
 690                                 break;
 691                         }
 692                 }
 693
 694                 if (!vbt) {
 695                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 696                         pci_unmap_rom(pdev, bios);
 697                         return -1;
 698                 }
 699
 700                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 701         }
 702 #endif
 703
 704         /* Grab useful general definitions */
 705         parse_general_features(dev_priv, bdb);
 706         parse_general_definitions(dev_priv, bdb);
 707         parse_lfp_panel_data(dev_priv, bdb);
 708         parse_sdvo_panel_data(dev_priv, bdb);
 709         parse_sdvo_device_mapping(dev_priv, bdb);
 710         parse_device_mapping(dev_priv, bdb);
 711         parse_driver_features(dev_priv, bdb);
 712         parse_edp(dev_priv, bdb);
 713
 714 #if 0
 715         if (bios)
 716                 pci_unmap_rom(pdev, bios);
 717 #endif
 718
 719         return 0;
 720 }
 721
 722 /* Ensure that vital registers have been initialised, even if the BIOS
 723  * is absent or just failing to do its job.
 724  */
 725 void intel_setup_bios(struct drm_device *dev)
 726 {
 727         struct drm_i915_private *dev_priv = dev->dev_private;
 728
 729          /* Set the Panel Power On/Off timings if uninitialized. */
 730         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
 731                 /* Set T2 to 40ms and T5 to 200ms */
 732                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 733
 734                 /* Set T3 to 35ms and Tx to 200ms */
 735                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 736         }
 737 }