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