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