sys/dev/drm/i915/intel_bios.c

   1 /*
   2  * Copyright © 2006 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27 #include <drm/drmP.h>
  28 #include <drm/drm_dp_helper.h>
  29 #include <drm/i915_drm.h>
  30 #include "i915_drv.h"
  31 #include "intel_bios.h"
  32
  33 #define SLAVE_ADDR1     0x70
  34 #define SLAVE_ADDR2     0x72
  35
  36 static int panel_type;
  37
  38 static void *
  39 find_section(struct bdb_header *bdb, int section_id)
  40 {
  41         u8 *base = (u8 *)bdb;
  42         int index = 0;
  43         u16 total, current_size;
  44         u8 current_id;
  45
  46         /* skip to first section */
  47         index += bdb->header_size;
  48         total = bdb->bdb_size;
  49
  50         /* walk the sections looking for section_id */
  51         while (index < total) {
  52                 current_id = *(base + index);
  53                 index++;
  54                 current_size = *((u16 *)(base + index));
  55                 index += 2;
  56                 if (current_id == section_id)
  57                         return base + index;
  58                 index += current_size;
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static u16
  65 get_blocksize(void *p)
  66 {
  67         u16 *block_ptr, block_size;
  68
  69         block_ptr = (u16 *)((char *)p - 2);
  70         block_size = *block_ptr;
  71         return block_size;
  72 }
  73
  74 static void
  75 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  76                         const struct lvds_dvo_timing *dvo_timing)
  77 {
  78         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  79                 dvo_timing->hactive_lo;
  80         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  81                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  82         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  83                 dvo_timing->hsync_pulse_width;
  84         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  85                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  86
  87         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  88                 dvo_timing->vactive_lo;
  89         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  90                 dvo_timing->vsync_off;
  91         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  92                 dvo_timing->vsync_pulse_width;
  93         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  94                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  95         panel_fixed_mode->clock = dvo_timing->clock * 10;
  96         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  97
  98         if (dvo_timing->hsync_positive)
  99                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 100         else
 101                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 102
 103         if (dvo_timing->vsync_positive)
 104                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 105         else
 106                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 107
 108         /* Some VBTs have bogus h/vtotal values */
 109         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 110                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 111         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 112                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 113
 114         drm_mode_set_name(panel_fixed_mode);
 115 }
 116
 117 static bool
 118 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
 119                            const struct lvds_dvo_timing *b)
 120 {
 121         if (a->hactive_hi != b->hactive_hi ||
 122             a->hactive_lo != b->hactive_lo)
 123                 return false;
 124
 125         if (a->hsync_off_hi != b->hsync_off_hi ||
 126             a->hsync_off_lo != b->hsync_off_lo)
 127                 return false;
 128
 129         if (a->hsync_pulse_width != b->hsync_pulse_width)
 130                 return false;
 131
 132         if (a->hblank_hi != b->hblank_hi ||
 133             a->hblank_lo != b->hblank_lo)
 134                 return false;
 135
 136         if (a->vactive_hi != b->vactive_hi ||
 137             a->vactive_lo != b->vactive_lo)
 138                 return false;
 139
 140         if (a->vsync_off != b->vsync_off)
 141                 return false;
 142
 143         if (a->vsync_pulse_width != b->vsync_pulse_width)
 144                 return false;
 145
 146         if (a->vblank_hi != b->vblank_hi ||
 147             a->vblank_lo != b->vblank_lo)
 148                 return false;
 149
 150         return true;
 151 }
 152
 153 static const struct lvds_dvo_timing *
 154 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 155                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 156                     int index)
 157 {
 158         /*
 159          * the size of fp_timing varies on the different platform.
 160          * So calculate the DVO timing relative offset in LVDS data
 161          * entry to get the DVO timing entry
 162          */
 163
 164         int lfp_data_size =
 165                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 166                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 167         int dvo_timing_offset =
 168                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 169                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 170         const char *entry = (const char *)lvds_lfp_data->data + lfp_data_size * index;
 171
 172         return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 173 }
 174
 175 /* get lvds_fp_timing entry
 176  * this function may return NULL if the corresponding entry is invalid
 177  */
 178 static const struct lvds_fp_timing *
 179 get_lvds_fp_timing(const struct bdb_header *bdb,
 180                    const struct bdb_lvds_lfp_data *data,
 181                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
 182                    int index)
 183 {
 184         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
 185         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
 186         size_t ofs;
 187
 188         if (index >= ARRAY_SIZE(ptrs->ptr))
 189                 return NULL;
 190         ofs = ptrs->ptr[index].fp_timing_offset;
 191         if (ofs < data_ofs ||
 192             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
 193                 return NULL;
 194         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
 195 }
 196
 197 /* Try to find integrated panel data */
 198 static void
 199 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 200                             struct bdb_header *bdb)
 201 {
 202         const struct bdb_lvds_options *lvds_options;
 203         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 204         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 205         const struct lvds_dvo_timing *panel_dvo_timing;
 206         const struct lvds_fp_timing *fp_timing;
 207         struct drm_display_mode *panel_fixed_mode;
 208         int i, downclock;
 209
 210         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 211         if (!lvds_options)
 212                 return;
 213
 214         dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
 215         if (lvds_options->panel_type == 0xff)
 216                 return;
 217
 218         panel_type = lvds_options->panel_type;
 219
 220         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 221         if (!lvds_lfp_data)
 222                 return;
 223
 224         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 225         if (!lvds_lfp_data_ptrs)
 226                 return;
 227
 228         dev_priv->vbt.lvds_vbt = 1;
 229
 230         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 231                                                lvds_lfp_data_ptrs,
 232                                                lvds_options->panel_type);
 233
 234         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 235         if (!panel_fixed_mode)
 236                 return;
 237
 238         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 239
 240         dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 241
 242         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 243         drm_mode_debug_printmodeline(panel_fixed_mode);
 244
 245         /*
 246          * Iterate over the LVDS panel timing info to find the lowest clock
 247          * for the native resolution.
 248          */
 249         downclock = panel_dvo_timing->clock;
 250         for (i = 0; i < 16; i++) {
 251                 const struct lvds_dvo_timing *dvo_timing;
 252
 253                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 254                                                  lvds_lfp_data_ptrs,
 255                                                  i);
 256                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 257                     dvo_timing->clock < downclock)
 258                         downclock = dvo_timing->clock;
 259         }
 260
 261         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
 262                 dev_priv->lvds_downclock_avail = 1;
 263                 dev_priv->lvds_downclock = downclock * 10;
 264                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 265                               "Normal Clock %dKHz, downclock %dKHz\n",
 266                               panel_fixed_mode->clock, 10*downclock);
 267         }
 268
 269         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
 270                                        lvds_lfp_data_ptrs,
 271                                        lvds_options->panel_type);
 272         if (fp_timing) {
 273                 /* check the resolution, just to be sure */
 274                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
 275                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
 276                         dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
 277                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 278                                       dev_priv->vbt.bios_lvds_val);
 279                 }
 280         }
 281 }
 282
 283 /* Try to find sdvo panel data */
 284 static void
 285 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 286                       struct bdb_header *bdb)
 287 {
 288         struct lvds_dvo_timing *dvo_timing;
 289         struct drm_display_mode *panel_fixed_mode;
 290         int index;
 291
 292         index = i915_vbt_sdvo_panel_type;
 293         if (index == -2) {
 294                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 295                 return;
 296         }
 297
 298         if (index == -1) {
 299                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 300
 301                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 302                 if (!sdvo_lvds_options)
 303                         return;
 304
 305                 index = sdvo_lvds_options->panel_type;
 306         }
 307
 308         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 309         if (!dvo_timing)
 310                 return;
 311
 312         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 313         if (!panel_fixed_mode)
 314                 return;
 315
 316         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 317
 318         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 319
 320         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 321         drm_mode_debug_printmodeline(panel_fixed_mode);
 322 }
 323
 324 static int intel_bios_ssc_frequency(struct drm_device *dev,
 325                                     bool alternate)
 326 {
 327         switch (INTEL_INFO(dev)->gen) {
 328         case 2:
 329                 return alternate ? 66 : 48;
 330         case 3:
 331         case 4:
 332                 return alternate ? 100 : 96;
 333         default:
 334                 return alternate ? 100 : 120;
 335         }
 336 }
 337
 338 static void
 339 parse_general_features(struct drm_i915_private *dev_priv,
 340                        struct bdb_header *bdb)
 341 {
 342         struct drm_device *dev = dev_priv->dev;
 343         struct bdb_general_features *general;
 344
 345         general = find_section(bdb, BDB_GENERAL_FEATURES);
 346         if (general) {
 347                 dev_priv->vbt.int_tv_support = general->int_tv_support;
 348                 dev_priv->vbt.int_crt_support = general->int_crt_support;
 349                 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
 350                 dev_priv->vbt.lvds_ssc_freq =
 351                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 352                 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
 353                 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 354                 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",
 355                               dev_priv->vbt.int_tv_support,
 356                               dev_priv->vbt.int_crt_support,
 357                               dev_priv->vbt.lvds_use_ssc,
 358                               dev_priv->vbt.lvds_ssc_freq,
 359                               dev_priv->vbt.display_clock_mode,
 360                               dev_priv->vbt.fdi_rx_polarity_inverted);
 361         }
 362 }
 363
 364 static void
 365 parse_general_definitions(struct drm_i915_private *dev_priv,
 366                           struct bdb_header *bdb)
 367 {
 368         struct bdb_general_definitions *general;
 369
 370         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 371         if (general) {
 372                 u16 block_size = get_blocksize(general);
 373                 if (block_size >= sizeof(*general)) {
 374                         int bus_pin = general->crt_ddc_gmbus_pin;
 375                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 376                         if (intel_gmbus_is_port_valid(bus_pin))
 377                                 dev_priv->vbt.crt_ddc_pin = bus_pin;
 378                 } else {
 379                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 380                                       block_size);
 381                 }
 382         }
 383 }
 384
 385 static void
 386 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 387                           struct bdb_header *bdb)
 388 {
 389         struct sdvo_device_mapping *p_mapping;
 390         struct bdb_general_definitions *p_defs;
 391         struct child_device_config *p_child;
 392         int i, child_device_num, count;
 393         u16     block_size;
 394
 395         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 396         if (!p_defs) {
 397                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 398                 return;
 399         }
 400         /* judge whether the size of child device meets the requirements.
 401          * If the child device size obtained from general definition block
 402          * is different with sizeof(struct child_device_config), skip the
 403          * parsing of sdvo device info
 404          */
 405         if (p_defs->child_dev_size != sizeof(*p_child)) {
 406                 /* different child dev size . Ignore it */
 407                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 408                 return;
 409         }
 410         /* get the block size of general definitions */
 411         block_size = get_blocksize(p_defs);
 412         /* get the number of child device */
 413         child_device_num = (block_size - sizeof(*p_defs)) /
 414                                 sizeof(*p_child);
 415         count = 0;
 416         for (i = 0; i < child_device_num; i++) {
 417                 p_child = &(p_defs->devices[i]);
 418                 if (!p_child->device_type) {
 419                         /* skip the device block if device type is invalid */
 420                         continue;
 421                 }
 422                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 423                         p_child->slave_addr != SLAVE_ADDR2) {
 424                         /*
 425                          * If the slave address is neither 0x70 nor 0x72,
 426                          * it is not a SDVO device. Skip it.
 427                          */
 428                         continue;
 429                 }
 430                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 431                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 432                         /* skip the incorrect SDVO port */
 433                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 434                         continue;
 435                 }
 436                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 437                                 " %s port\n",
 438                                 p_child->slave_addr,
 439                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 440                                         "SDVOB" : "SDVOC");
 441                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 442                 if (!p_mapping->initialized) {
 443                         p_mapping->dvo_port = p_child->dvo_port;
 444                         p_mapping->slave_addr = p_child->slave_addr;
 445                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 446                         p_mapping->ddc_pin = p_child->ddc_pin;
 447                         p_mapping->i2c_pin = p_child->i2c_pin;
 448                         p_mapping->initialized = 1;
 449                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 450                                       p_mapping->dvo_port,
 451                                       p_mapping->slave_addr,
 452                                       p_mapping->dvo_wiring,
 453                                       p_mapping->ddc_pin,
 454                                       p_mapping->i2c_pin);
 455                 } else {
 456                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 457                                          "two SDVO device.\n");
 458                 }
 459                 if (p_child->slave2_addr) {
 460                         /* Maybe this is a SDVO device with multiple inputs */
 461                         /* And the mapping info is not added */
 462                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 463                                 " is a SDVO device with multiple inputs.\n");
 464                 }
 465                 count++;
 466         }
 467
 468         if (!count) {
 469                 /* No SDVO device info is found */
 470                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 471         }
 472         return;
 473 }
 474
 475 static void
 476 parse_driver_features(struct drm_i915_private *dev_priv,
 477                        struct bdb_header *bdb)
 478 {
 479         struct drm_device *dev = dev_priv->dev;
 480         struct bdb_driver_features *driver;
 481
 482         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 483         if (!driver)
 484                 return;
 485
 486         if (SUPPORTS_EDP(dev) &&
 487             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 488                 dev_priv->vbt.edp_support = 1;
 489
 490         if (driver->dual_frequency)
 491                 dev_priv->render_reclock_avail = true;
 492 }
 493
 494 static void
 495 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 496 {
 497         struct bdb_edp *edp;
 498         struct edp_power_seq *edp_pps;
 499         struct edp_link_params *edp_link_params;
 500
 501         edp = find_section(bdb, BDB_EDP);
 502         if (!edp) {
 503                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->vbt.edp_support)
 504                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 505                 return;
 506         }
 507
 508         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 509         case EDP_18BPP:
 510                 dev_priv->vbt.edp_bpp = 18;
 511                 break;
 512         case EDP_24BPP:
 513                 dev_priv->vbt.edp_bpp = 24;
 514                 break;
 515         case EDP_30BPP:
 516                 dev_priv->vbt.edp_bpp = 30;
 517                 break;
 518         }
 519
 520         /* Get the eDP sequencing and link info */
 521         edp_pps = &edp->power_seqs[panel_type];
 522         edp_link_params = &edp->link_params[panel_type];
 523
 524         dev_priv->vbt.edp_pps = *edp_pps;
 525
 526         dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 527                 DP_LINK_BW_1_62;
 528         switch (edp_link_params->lanes) {
 529         case 0:
 530                 dev_priv->vbt.edp_lanes = 1;
 531                 break;
 532         case 1:
 533                 dev_priv->vbt.edp_lanes = 2;
 534                 break;
 535         case 3:
 536         default:
 537                 dev_priv->vbt.edp_lanes = 4;
 538                 break;
 539         }
 540         switch (edp_link_params->preemphasis) {
 541         case 0:
 542                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 543                 break;
 544         case 1:
 545                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 546                 break;
 547         case 2:
 548                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 549                 break;
 550         case 3:
 551                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 552                 break;
 553         }
 554         switch (edp_link_params->vswing) {
 555         case 0:
 556                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
 557                 break;
 558         case 1:
 559                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
 560                 break;
 561         case 2:
 562                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
 563                 break;
 564         case 3:
 565                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 566                 break;
 567         }
 568 }
 569
 570 static void
 571 parse_device_mapping(struct drm_i915_private *dev_priv,
 572                        struct bdb_header *bdb)
 573 {
 574         struct bdb_general_definitions *p_defs;
 575         struct child_device_config *p_child, *child_dev_ptr;
 576         int i, child_device_num, count;
 577         u16     block_size;
 578
 579         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 580         if (!p_defs) {
 581                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 582                 return;
 583         }
 584         /* judge whether the size of child device meets the requirements.
 585          * If the child device size obtained from general definition block
 586          * is different with sizeof(struct child_device_config), skip the
 587          * parsing of sdvo device info
 588          */
 589         if (p_defs->child_dev_size != sizeof(*p_child)) {
 590                 /* different child dev size . Ignore it */
 591                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 592                 return;
 593         }
 594         /* get the block size of general definitions */
 595         block_size = get_blocksize(p_defs);
 596         /* get the number of child device */
 597         child_device_num = (block_size - sizeof(*p_defs)) /
 598                                 sizeof(*p_child);
 599         count = 0;
 600         /* get the number of child device that is present */
 601         for (i = 0; i < child_device_num; i++) {
 602                 p_child = &(p_defs->devices[i]);
 603                 if (!p_child->device_type) {
 604                         /* skip the device block if device type is invalid */
 605                         continue;
 606                 }
 607                 count++;
 608         }
 609         if (!count) {
 610                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 611                 return;
 612         }
 613         dev_priv->vbt.child_dev = kmalloc(sizeof(*p_child) * count, M_DRM,
 614             M_WAITOK | M_ZERO);
 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 bdb_header *bdb = NULL;
 694         u8 __iomem *bios = NULL;
 695
 696         if (HAS_PCH_NOP(dev))
 697                 return -ENODEV;
 698
 699         init_vbt_defaults(dev_priv);
 700
 701         /* XXX Should this validation be moved to intel_opregion.c? */
 702         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 703                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 704                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 705                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 706                                          vbt->signature);
 707                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 708                 } else
 709                         dev_priv->opregion.vbt = NULL;
 710         }
 711         bios = NULL;
 712
 713 #if 1
 714         if (bdb == NULL) {
 715                 KIB_NOTYET();
 716                 return (-1);
 717         }
 718 #else
 719         if (bdb == NULL) {
 720                 struct vbt_header *vbt = NULL;
 721                 size_t size;
 722                 int i;
 723
 724                 bios = pci_map_rom(pdev, &size);
 725                 if (!bios)
 726                         return -1;
 727
 728                 /* Scour memory looking for the VBT signature */
 729                 for (i = 0; i + 4 < size; i++) {
 730                         if (!memcmp(bios + i, "$VBT", 4)) {
 731                                 vbt = (struct vbt_header *)(bios + i);
 732                                 break;
 733                         }
 734                 }
 735
 736                 if (!vbt) {
 737                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 738                         pci_unmap_rom(pdev, bios);
 739                         return -1;
 740                 }
 741
 742                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 743         }
 744 #endif
 745
 746         /* Grab useful general definitions */
 747         parse_general_features(dev_priv, bdb);
 748         parse_general_definitions(dev_priv, bdb);
 749         parse_lfp_panel_data(dev_priv, bdb);
 750         parse_sdvo_panel_data(dev_priv, bdb);
 751         parse_sdvo_device_mapping(dev_priv, bdb);
 752         parse_device_mapping(dev_priv, bdb);
 753         parse_driver_features(dev_priv, bdb);
 754         parse_edp(dev_priv, bdb);
 755
 756 #if 0
 757         if (bios)
 758                 pci_unmap_rom(pdev, bios);
 759 #endif
 760
 761         return 0;
 762 }
 763
 764 /* Ensure that vital registers have been initialised, even if the BIOS
 765  * is absent or just failing to do its job.
 766  */
 767 void intel_setup_bios(struct drm_device *dev)
 768 {
 769         struct drm_i915_private *dev_priv = dev->dev_private;
 770
 771          /* Set the Panel Power On/Off timings if uninitialized. */
 772         if (!HAS_PCH_SPLIT(dev) &&
 773             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 774                 /* Set T2 to 40ms and T5 to 200ms */
 775                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 776
 777                 /* Set T3 to 35ms and Tx to 200ms */
 778                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 779         }
 780 }