sys/dev/drm2/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
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <dev/drm2/drmP.h>
  32 #include <dev/drm2/drm_dp_helper.h>
  33 #include <dev/drm2/i915/i915_drm.h>
  34 #include <dev/drm2/i915/i915_drv.h>
  35 #include <dev/drm2/i915/intel_bios.h>
  36
  37 #define SLAVE_ADDR1     0x70
  38 #define SLAVE_ADDR2     0x72
  39
  40 static int panel_type;
  41
  42 static void *
  43 find_section(struct bdb_header *bdb, int section_id)
  44 {
  45         u8 *base = (u8 *)bdb;
  46         int index = 0;
  47         u16 total, current_size;
  48         u8 current_id;
  49
  50         /* skip to first section */
  51         index += bdb->header_size;
  52         total = bdb->bdb_size;
  53
  54         /* walk the sections looking for section_id */
  55         while (index < total) {
  56                 current_id = *(base + index);
  57                 index++;
  58                 current_size = *((u16 *)(base + index));
  59                 index += 2;
  60                 if (current_id == section_id)
  61                         return base + index;
  62                 index += current_size;
  63         }
  64
  65         return NULL;
  66 }
  67
  68 static u16
  69 get_blocksize(void *p)
  70 {
  71         u16 *block_ptr, block_size;
  72
  73         block_ptr = (u16 *)((char *)p - 2);
  74         block_size = *block_ptr;
  75         return block_size;
  76 }
  77
  78 static void
  79 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  80                         const struct lvds_dvo_timing *dvo_timing)
  81 {
  82         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  83                 dvo_timing->hactive_lo;
  84         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  85                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  86         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  87                 dvo_timing->hsync_pulse_width;
  88         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  89                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  90
  91         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  92                 dvo_timing->vactive_lo;
  93         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  94                 dvo_timing->vsync_off;
  95         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  96                 dvo_timing->vsync_pulse_width;
  97         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  98                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  99         panel_fixed_mode->clock = dvo_timing->clock * 10;
 100         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
 101
 102         if (dvo_timing->hsync_positive)
 103                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 104         else
 105                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 106
 107         if (dvo_timing->vsync_positive)
 108                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 109         else
 110                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 111
 112         /* Some VBTs have bogus h/vtotal values */
 113         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 114                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 115         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 116                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 117
 118         drm_mode_set_name(panel_fixed_mode);
 119 }
 120
 121 static bool
 122 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
 123                            const struct lvds_dvo_timing *b)
 124 {
 125         if (a->hactive_hi != b->hactive_hi ||
 126             a->hactive_lo != b->hactive_lo)
 127                 return false;
 128
 129         if (a->hsync_off_hi != b->hsync_off_hi ||
 130             a->hsync_off_lo != b->hsync_off_lo)
 131                 return false;
 132
 133         if (a->hsync_pulse_width != b->hsync_pulse_width)
 134                 return false;
 135
 136         if (a->hblank_hi != b->hblank_hi ||
 137             a->hblank_lo != b->hblank_lo)
 138                 return false;
 139
 140         if (a->vactive_hi != b->vactive_hi ||
 141             a->vactive_lo != b->vactive_lo)
 142                 return false;
 143
 144         if (a->vsync_off != b->vsync_off)
 145                 return false;
 146
 147         if (a->vsync_pulse_width != b->vsync_pulse_width)
 148                 return false;
 149
 150         if (a->vblank_hi != b->vblank_hi ||
 151             a->vblank_lo != b->vblank_lo)
 152                 return false;
 153
 154         return true;
 155 }
 156
 157 static const struct lvds_dvo_timing *
 158 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 159                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 160                     int index)
 161 {
 162         /*
 163          * the size of fp_timing varies on the different platform.
 164          * So calculate the DVO timing relative offset in LVDS data
 165          * entry to get the DVO timing entry
 166          */
 167
 168         int lfp_data_size =
 169                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 170                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 171         int dvo_timing_offset =
 172                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 173                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 174         const char *entry = (const char *)lvds_lfp_data->data + lfp_data_size * index;
 175
 176         return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 177 }
 178
 179 /* get lvds_fp_timing entry
 180  * this function may return NULL if the corresponding entry is invalid
 181  */
 182 static const struct lvds_fp_timing *
 183 get_lvds_fp_timing(const struct bdb_header *bdb,
 184                    const struct bdb_lvds_lfp_data *data,
 185                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
 186                    int index)
 187 {
 188         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
 189         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
 190         size_t ofs;
 191
 192         if (index >= ARRAY_SIZE(ptrs->ptr))
 193                 return NULL;
 194         ofs = ptrs->ptr[index].fp_timing_offset;
 195         if (ofs < data_ofs ||
 196             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
 197                 return NULL;
 198         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
 199 }
 200
 201 /* Try to find integrated panel data */
 202 static void
 203 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 204                             struct bdb_header *bdb)
 205 {
 206         const struct bdb_lvds_options *lvds_options;
 207         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 208         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 209         const struct lvds_dvo_timing *panel_dvo_timing;
 210         const struct lvds_fp_timing *fp_timing;
 211         struct drm_display_mode *panel_fixed_mode;
 212         int i, downclock;
 213
 214         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 215         if (!lvds_options)
 216                 return;
 217
 218         dev_priv->lvds_dither = lvds_options->pixel_dither;
 219         if (lvds_options->panel_type == 0xff)
 220                 return;
 221
 222         panel_type = lvds_options->panel_type;
 223
 224         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 225         if (!lvds_lfp_data)
 226                 return;
 227
 228         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 229         if (!lvds_lfp_data_ptrs)
 230                 return;
 231
 232         dev_priv->lvds_vbt = 1;
 233
 234         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 235                                                lvds_lfp_data_ptrs,
 236                                                lvds_options->panel_type);
 237
 238         panel_fixed_mode = malloc(sizeof(*panel_fixed_mode), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 239         if (!panel_fixed_mode)
 240                 return;
 241
 242         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 243
 244         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 245
 246         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 247         drm_mode_debug_printmodeline(panel_fixed_mode);
 248
 249         /*
 250          * Iterate over the LVDS panel timing info to find the lowest clock
 251          * for the native resolution.
 252          */
 253         downclock = panel_dvo_timing->clock;
 254         for (i = 0; i < 16; i++) {
 255                 const struct lvds_dvo_timing *dvo_timing;
 256
 257                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 258                                                  lvds_lfp_data_ptrs,
 259                                                  i);
 260                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 261                     dvo_timing->clock < downclock)
 262                         downclock = dvo_timing->clock;
 263         }
 264
 265         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
 266                 dev_priv->lvds_downclock_avail = 1;
 267                 dev_priv->lvds_downclock = downclock * 10;
 268                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 269                               "Normal Clock %dKHz, downclock %dKHz\n",
 270                               panel_fixed_mode->clock, 10*downclock);
 271         }
 272
 273         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
 274                                        lvds_lfp_data_ptrs,
 275                                        lvds_options->panel_type);
 276         if (fp_timing) {
 277                 /* check the resolution, just to be sure */
 278                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
 279                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
 280                         dev_priv->bios_lvds_val = fp_timing->lvds_reg_val;
 281                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 282                                       dev_priv->bios_lvds_val);
 283                 }
 284         }
 285 }
 286
 287 /* Try to find sdvo panel data */
 288 static void
 289 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 290                       struct bdb_header *bdb)
 291 {
 292         struct lvds_dvo_timing *dvo_timing;
 293         struct drm_display_mode *panel_fixed_mode;
 294         int index;
 295
 296         index = i915_vbt_sdvo_panel_type;
 297         if (index == -2) {
 298                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 299                 return;
 300         }
 301
 302         if (index == -1) {
 303                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 304
 305                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 306                 if (!sdvo_lvds_options)
 307                         return;
 308
 309                 index = sdvo_lvds_options->panel_type;
 310         }
 311
 312         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 313         if (!dvo_timing)
 314                 return;
 315
 316         panel_fixed_mode = malloc(sizeof(*panel_fixed_mode), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 317         if (!panel_fixed_mode)
 318                 return;
 319
 320         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 321
 322         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 323
 324         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 325         drm_mode_debug_printmodeline(panel_fixed_mode);
 326 }
 327
 328 static int intel_bios_ssc_frequency(struct drm_device *dev,
 329                                     bool alternate)
 330 {
 331         switch (INTEL_INFO(dev)->gen) {
 332         case 2:
 333                 return alternate ? 66 : 48;
 334         case 3:
 335         case 4:
 336                 return alternate ? 100 : 96;
 337         default:
 338                 return alternate ? 100 : 120;
 339         }
 340 }
 341
 342 static void
 343 parse_general_features(struct drm_i915_private *dev_priv,
 344                        struct bdb_header *bdb)
 345 {
 346         struct drm_device *dev = dev_priv->dev;
 347         struct bdb_general_features *general;
 348
 349         general = find_section(bdb, BDB_GENERAL_FEATURES);
 350         if (general) {
 351                 dev_priv->int_tv_support = general->int_tv_support;
 352                 dev_priv->int_crt_support = general->int_crt_support;
 353                 dev_priv->lvds_use_ssc = general->enable_ssc;
 354                 dev_priv->lvds_ssc_freq =
 355                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 356                 dev_priv->display_clock_mode = general->display_clock_mode;
 357                 dev_priv->fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 358                 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 fdi_rx_polarity_inverted %d\n",
 359                               dev_priv->int_tv_support,
 360                               dev_priv->int_crt_support,
 361                               dev_priv->lvds_use_ssc,
 362                               dev_priv->lvds_ssc_freq,
 363                               dev_priv->display_clock_mode,
 364                               dev_priv->fdi_rx_polarity_inverted);
 365         }
 366 }
 367
 368 static void
 369 parse_general_definitions(struct drm_i915_private *dev_priv,
 370                           struct bdb_header *bdb)
 371 {
 372         struct bdb_general_definitions *general;
 373
 374         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 375         if (general) {
 376                 u16 block_size = get_blocksize(general);
 377                 if (block_size >= sizeof(*general)) {
 378                         int bus_pin = general->crt_ddc_gmbus_pin;
 379                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 380                         if (intel_gmbus_is_port_valid(bus_pin))
 381                                 dev_priv->crt_ddc_pin = bus_pin;
 382                 } else {
 383                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 384                                       block_size);
 385                 }
 386         }
 387 }
 388
 389 static void
 390 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 391                           struct bdb_header *bdb)
 392 {
 393         struct sdvo_device_mapping *p_mapping;
 394         struct bdb_general_definitions *p_defs;
 395         struct child_device_config *p_child;
 396         int i, child_device_num, count;
 397         u16     block_size;
 398
 399         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 400         if (!p_defs) {
 401                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 402                 return;
 403         }
 404         /* judge whether the size of child device meets the requirements.
 405          * If the child device size obtained from general definition block
 406          * is different with sizeof(struct child_device_config), skip the
 407          * parsing of sdvo device info
 408          */
 409         if (p_defs->child_dev_size != sizeof(*p_child)) {
 410                 /* different child dev size . Ignore it */
 411                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 412                 return;
 413         }
 414         /* get the block size of general definitions */
 415         block_size = get_blocksize(p_defs);
 416         /* get the number of child device */
 417         child_device_num = (block_size - sizeof(*p_defs)) /
 418                                 sizeof(*p_child);
 419         count = 0;
 420         for (i = 0; i < child_device_num; i++) {
 421                 p_child = &(p_defs->devices[i]);
 422                 if (!p_child->device_type) {
 423                         /* skip the device block if device type is invalid */
 424                         continue;
 425                 }
 426                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 427                         p_child->slave_addr != SLAVE_ADDR2) {
 428                         /*
 429                          * If the slave address is neither 0x70 nor 0x72,
 430                          * it is not a SDVO device. Skip it.
 431                          */
 432                         continue;
 433                 }
 434                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 435                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 436                         /* skip the incorrect SDVO port */
 437                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 438                         continue;
 439                 }
 440                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 441                                 " %s port\n",
 442                                 p_child->slave_addr,
 443                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 444                                         "SDVOB" : "SDVOC");
 445                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 446                 if (!p_mapping->initialized) {
 447                         p_mapping->dvo_port = p_child->dvo_port;
 448                         p_mapping->slave_addr = p_child->slave_addr;
 449                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 450                         p_mapping->ddc_pin = p_child->ddc_pin;
 451                         p_mapping->i2c_pin = p_child->i2c_pin;
 452                         p_mapping->initialized = 1;
 453                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 454                                       p_mapping->dvo_port,
 455                                       p_mapping->slave_addr,
 456                                       p_mapping->dvo_wiring,
 457                                       p_mapping->ddc_pin,
 458                                       p_mapping->i2c_pin);
 459                 } else {
 460                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 461                                          "two SDVO device.\n");
 462                 }
 463                 if (p_child->slave2_addr) {
 464                         /* Maybe this is a SDVO device with multiple inputs */
 465                         /* And the mapping info is not added */
 466                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 467                                 " is a SDVO device with multiple inputs.\n");
 468                 }
 469                 count++;
 470         }
 471
 472         if (!count) {
 473                 /* No SDVO device info is found */
 474                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 475         }
 476         return;
 477 }
 478
 479 static void
 480 parse_driver_features(struct drm_i915_private *dev_priv,
 481                        struct bdb_header *bdb)
 482 {
 483         struct drm_device *dev = dev_priv->dev;
 484         struct bdb_driver_features *driver;
 485
 486         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 487         if (!driver)
 488                 return;
 489
 490         if (SUPPORTS_EDP(dev) &&
 491             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 492                 dev_priv->edp.support = 1;
 493
 494         if (driver->dual_frequency)
 495                 dev_priv->render_reclock_avail = true;
 496 }
 497
 498 static void
 499 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 500 {
 501         struct bdb_edp *edp;
 502         struct edp_power_seq *edp_pps;
 503         struct edp_link_params *edp_link_params;
 504
 505         edp = find_section(bdb, BDB_EDP);
 506         if (!edp) {
 507                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support)
 508                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 509                 return;
 510         }
 511
 512         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 513         case EDP_18BPP:
 514                 dev_priv->edp.bpp = 18;
 515                 break;
 516         case EDP_24BPP:
 517                 dev_priv->edp.bpp = 24;
 518                 break;
 519         case EDP_30BPP:
 520                 dev_priv->edp.bpp = 30;
 521                 break;
 522         }
 523
 524         /* Get the eDP sequencing and link info */
 525         edp_pps = &edp->power_seqs[panel_type];
 526         edp_link_params = &edp->link_params[panel_type];
 527
 528         dev_priv->edp.pps = *edp_pps;
 529
 530         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 531                 DP_LINK_BW_1_62;
 532         switch (edp_link_params->lanes) {
 533         case 0:
 534                 dev_priv->edp.lanes = 1;
 535                 break;
 536         case 1:
 537                 dev_priv->edp.lanes = 2;
 538                 break;
 539         case 3:
 540         default:
 541                 dev_priv->edp.lanes = 4;
 542                 break;
 543         }
 544         switch (edp_link_params->preemphasis) {
 545         case 0:
 546                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 547                 break;
 548         case 1:
 549                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 550                 break;
 551         case 2:
 552                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 553                 break;
 554         case 3:
 555                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 556                 break;
 557         }
 558         switch (edp_link_params->vswing) {
 559         case 0:
 560                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 561                 break;
 562         case 1:
 563                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 564                 break;
 565         case 2:
 566                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 567                 break;
 568         case 3:
 569                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 570                 break;
 571         }
 572 }
 573
 574 static void
 575 parse_device_mapping(struct drm_i915_private *dev_priv,
 576                        struct bdb_header *bdb)
 577 {
 578         struct bdb_general_definitions *p_defs;
 579         struct child_device_config *p_child, *child_dev_ptr;
 580         int i, child_device_num, count;
 581         u16     block_size;
 582
 583         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 584         if (!p_defs) {
 585                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 586                 return;
 587         }
 588         /* judge whether the size of child device meets the requirements.
 589          * If the child device size obtained from general definition block
 590          * is different with sizeof(struct child_device_config), skip the
 591          * parsing of sdvo device info
 592          */
 593         if (p_defs->child_dev_size != sizeof(*p_child)) {
 594                 /* different child dev size . Ignore it */
 595                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 596                 return;
 597         }
 598         /* get the block size of general definitions */
 599         block_size = get_blocksize(p_defs);
 600         /* get the number of child device */
 601         child_device_num = (block_size - sizeof(*p_defs)) /
 602                                 sizeof(*p_child);
 603         count = 0;
 604         /* get the number of child device that is present */
 605         for (i = 0; i < child_device_num; i++) {
 606                 p_child = &(p_defs->devices[i]);
 607                 if (!p_child->device_type) {
 608                         /* skip the device block if device type is invalid */
 609                         continue;
 610                 }
 611                 count++;
 612         }
 613         if (!count) {
 614                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 615                 return;
 616         }
 617         dev_priv->child_dev = malloc(count * sizeof(*p_child), DRM_MEM_KMS, M_WAITOK | M_ZERO);
 618         if (!dev_priv->child_dev) {
 619                 DRM_DEBUG_KMS("No memory space for child device\n");
 620                 return;
 621         }
 622
 623         dev_priv->child_dev_num = count;
 624         count = 0;
 625         for (i = 0; i < child_device_num; i++) {
 626                 p_child = &(p_defs->devices[i]);
 627                 if (!p_child->device_type) {
 628                         /* skip the device block if device type is invalid */
 629                         continue;
 630                 }
 631                 child_dev_ptr = dev_priv->child_dev + count;
 632                 count++;
 633                 memcpy((void *)child_dev_ptr, (void *)p_child,
 634                                         sizeof(*p_child));
 635         }
 636         return;
 637 }
 638
 639 static void
 640 init_vbt_defaults(struct drm_i915_private *dev_priv)
 641 {
 642         struct drm_device *dev = dev_priv->dev;
 643
 644         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 645
 646         /* LFP panel data */
 647         dev_priv->lvds_dither = 1;
 648         dev_priv->lvds_vbt = 0;
 649
 650         /* SDVO panel data */
 651         dev_priv->sdvo_lvds_vbt_mode = NULL;
 652
 653         /* general features */
 654         dev_priv->int_tv_support = 1;
 655         dev_priv->int_crt_support = 1;
 656
 657         /* Default to using SSC */
 658         dev_priv->lvds_use_ssc = 1;
 659         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
 660         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
 661 }
 662
 663 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 664 {
 665         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 666                       "VBIOS ROM for %s\n",
 667                       id->ident);
 668         return 1;
 669 }
 670
 671 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 672         {
 673                 .callback = intel_no_opregion_vbt_callback,
 674                 .ident = "ThinkCentre A57",
 675                 .matches = {
 676                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 677                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 678                 },
 679         },
 680         { }
 681 };
 682
 683 /**
 684  * intel_parse_bios - find VBT and initialize settings from the BIOS
 685  * @dev: DRM device
 686  *
 687  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 688  * to appropriate values.
 689  *
 690  * Returns 0 on success, nonzero on failure.
 691  */
 692 int
 693 intel_parse_bios(struct drm_device *dev)
 694 {
 695         struct drm_i915_private *dev_priv = dev->dev_private;
 696         device_t vga_dev = device_get_parent(dev->dev);;
 697         struct bdb_header *bdb = NULL;
 698         u8 __iomem *bios = NULL;
 699
 700         init_vbt_defaults(dev_priv);
 701
 702         /* XXX Should this validation be moved to intel_opregion.c? */
 703         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 704                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 705                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 706                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 707                                          vbt->signature);
 708                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 709                 } else
 710                         dev_priv->opregion.vbt = NULL;
 711         }
 712
 713         if (bdb == NULL) {
 714                 struct vbt_header *vbt = NULL;
 715                 size_t size;
 716                 int i;
 717
 718                 bios = vga_pci_map_bios(vga_dev, &size);
 719                 if (!bios)
 720                         return -1;
 721
 722                 /* Scour memory looking for the VBT signature */
 723                 for (i = 0; i + 4 < size; i++) {
 724                         if (!memcmp(bios + i, "$VBT", 4)) {
 725                                 vbt = (struct vbt_header *)(bios + i);
 726                                 break;
 727                         }
 728                 }
 729
 730                 if (!vbt) {
 731                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 732                         vga_pci_unmap_bios(vga_dev, bios);
 733                         return -1;
 734                 }
 735
 736                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 737         }
 738
 739         /* Grab useful general definitions */
 740         parse_general_features(dev_priv, bdb);
 741         parse_general_definitions(dev_priv, bdb);
 742         parse_lfp_panel_data(dev_priv, bdb);
 743         parse_sdvo_panel_data(dev_priv, bdb);
 744         parse_sdvo_device_mapping(dev_priv, bdb);
 745         parse_device_mapping(dev_priv, bdb);
 746         parse_driver_features(dev_priv, bdb);
 747         parse_edp(dev_priv, bdb);
 748
 749         if (bios)
 750                 vga_pci_unmap_bios(vga_dev, bios);
 751
 752         return 0;
 753 }
 754
 755 /*
 756  * NOTE Linux<->FreeBSD:
 757  * Apparently, Linux doesn't free those pointers.
 758  * TODO: Report that upstream.
 759  */
 760 void
 761 intel_free_parsed_bios_data(struct drm_device *dev)
 762 {
 763         struct drm_i915_private *dev_priv = dev->dev_private;
 764
 765         free(dev_priv->lfp_lvds_vbt_mode, DRM_MEM_KMS);
 766         free(dev_priv->sdvo_lvds_vbt_mode, DRM_MEM_KMS);
 767         free(dev_priv->child_dev, DRM_MEM_KMS);
 768
 769         dev_priv->lfp_lvds_vbt_mode = NULL;
 770         dev_priv->sdvo_lvds_vbt_mode = NULL;
 771         dev_priv->child_dev = NULL;
 772 }
 773
 774 /* Ensure that vital registers have been initialised, even if the BIOS
 775  * is absent or just failing to do its job.
 776  */
 777 void intel_setup_bios(struct drm_device *dev)
 778 {
 779         struct drm_i915_private *dev_priv = dev->dev_private;
 780
 781          /* Set the Panel Power On/Off timings if uninitialized. */
 782         if (!HAS_PCH_SPLIT(dev) &&
 783             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 784                 /* Set T2 to 40ms and T5 to 200ms */
 785                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 786
 787                 /* Set T3 to 35ms and Tx to 200ms */
 788                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 789         }
 790 }