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->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->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 = kmalloc(sizeof(*panel_fixed_mode), M_DRM,
 235             M_WAITOK | M_ZERO);
 236         if (!panel_fixed_mode)
 237                 return;
 238
 239         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 240
 241         dev_priv->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->bios_lvds_val = fp_timing->lvds_reg_val;
 278                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 279                                       dev_priv->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 = kmalloc(sizeof(*panel_fixed_mode), M_DRM,
 314             M_WAITOK | M_ZERO);
 315         if (!panel_fixed_mode)
 316                 return;
 317
 318         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 319
 320         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 321
 322         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 323         drm_mode_debug_printmodeline(panel_fixed_mode);
 324 }
 325
 326 static int intel_bios_ssc_frequency(struct drm_device *dev,
 327                                     bool alternate)
 328 {
 329         switch (INTEL_INFO(dev)->gen) {
 330         case 2:
 331                 return alternate ? 66 : 48;
 332         case 3:
 333         case 4:
 334                 return alternate ? 100 : 96;
 335         default:
 336                 return alternate ? 100 : 120;
 337         }
 338 }
 339
 340 static void
 341 parse_general_features(struct drm_i915_private *dev_priv,
 342                        struct bdb_header *bdb)
 343 {
 344         struct drm_device *dev = dev_priv->dev;
 345         struct bdb_general_features *general;
 346
 347         general = find_section(bdb, BDB_GENERAL_FEATURES);
 348         if (general) {
 349                 dev_priv->int_tv_support = general->int_tv_support;
 350                 dev_priv->int_crt_support = general->int_crt_support;
 351                 dev_priv->lvds_use_ssc = general->enable_ssc;
 352                 dev_priv->lvds_ssc_freq =
 353                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 354                 dev_priv->display_clock_mode = general->display_clock_mode;
 355                 dev_priv->fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 356                 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",
 357                               dev_priv->int_tv_support,
 358                               dev_priv->int_crt_support,
 359                               dev_priv->lvds_use_ssc,
 360                               dev_priv->lvds_ssc_freq,
 361                               dev_priv->display_clock_mode,
 362                               dev_priv->fdi_rx_polarity_inverted);
 363         }
 364 }
 365
 366 static void
 367 parse_general_definitions(struct drm_i915_private *dev_priv,
 368                           struct bdb_header *bdb)
 369 {
 370         struct bdb_general_definitions *general;
 371
 372         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 373         if (general) {
 374                 u16 block_size = get_blocksize(general);
 375                 if (block_size >= sizeof(*general)) {
 376                         int bus_pin = general->crt_ddc_gmbus_pin;
 377                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 378                         if (intel_gmbus_is_port_valid(bus_pin))
 379                                 dev_priv->crt_ddc_pin = bus_pin;
 380                 } else {
 381                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 382                                       block_size);
 383                 }
 384         }
 385 }
 386
 387 static void
 388 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 389                           struct bdb_header *bdb)
 390 {
 391         struct sdvo_device_mapping *p_mapping;
 392         struct bdb_general_definitions *p_defs;
 393         struct child_device_config *p_child;
 394         int i, child_device_num, count;
 395         u16     block_size;
 396
 397         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 398         if (!p_defs) {
 399                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 400                 return;
 401         }
 402         /* judge whether the size of child device meets the requirements.
 403          * If the child device size obtained from general definition block
 404          * is different with sizeof(struct child_device_config), skip the
 405          * parsing of sdvo device info
 406          */
 407         if (p_defs->child_dev_size != sizeof(*p_child)) {
 408                 /* different child dev size . Ignore it */
 409                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 410                 return;
 411         }
 412         /* get the block size of general definitions */
 413         block_size = get_blocksize(p_defs);
 414         /* get the number of child device */
 415         child_device_num = (block_size - sizeof(*p_defs)) /
 416                                 sizeof(*p_child);
 417         count = 0;
 418         for (i = 0; i < child_device_num; i++) {
 419                 p_child = &(p_defs->devices[i]);
 420                 if (!p_child->device_type) {
 421                         /* skip the device block if device type is invalid */
 422                         continue;
 423                 }
 424                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 425                         p_child->slave_addr != SLAVE_ADDR2) {
 426                         /*
 427                          * If the slave address is neither 0x70 nor 0x72,
 428                          * it is not a SDVO device. Skip it.
 429                          */
 430                         continue;
 431                 }
 432                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 433                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 434                         /* skip the incorrect SDVO port */
 435                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 436                         continue;
 437                 }
 438                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 439                                 " %s port\n",
 440                                 p_child->slave_addr,
 441                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 442                                         "SDVOB" : "SDVOC");
 443                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 444                 if (!p_mapping->initialized) {
 445                         p_mapping->dvo_port = p_child->dvo_port;
 446                         p_mapping->slave_addr = p_child->slave_addr;
 447                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 448                         p_mapping->ddc_pin = p_child->ddc_pin;
 449                         p_mapping->i2c_pin = p_child->i2c_pin;
 450                         p_mapping->initialized = 1;
 451                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 452                                       p_mapping->dvo_port,
 453                                       p_mapping->slave_addr,
 454                                       p_mapping->dvo_wiring,
 455                                       p_mapping->ddc_pin,
 456                                       p_mapping->i2c_pin);
 457                 } else {
 458                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 459                                          "two SDVO device.\n");
 460                 }
 461                 if (p_child->slave2_addr) {
 462                         /* Maybe this is a SDVO device with multiple inputs */
 463                         /* And the mapping info is not added */
 464                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 465                                 " is a SDVO device with multiple inputs.\n");
 466                 }
 467                 count++;
 468         }
 469
 470         if (!count) {
 471                 /* No SDVO device info is found */
 472                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 473         }
 474         return;
 475 }
 476
 477 static void
 478 parse_driver_features(struct drm_i915_private *dev_priv,
 479                        struct bdb_header *bdb)
 480 {
 481         struct drm_device *dev = dev_priv->dev;
 482         struct bdb_driver_features *driver;
 483
 484         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 485         if (!driver)
 486                 return;
 487
 488         if (SUPPORTS_EDP(dev) &&
 489             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 490                 dev_priv->edp.support = 1;
 491
 492         if (driver->dual_frequency)
 493                 dev_priv->render_reclock_avail = true;
 494 }
 495
 496 static void
 497 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 498 {
 499         struct bdb_edp *edp;
 500         struct edp_power_seq *edp_pps;
 501         struct edp_link_params *edp_link_params;
 502
 503         edp = find_section(bdb, BDB_EDP);
 504         if (!edp) {
 505                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support)
 506                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 507                 return;
 508         }
 509
 510         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 511         case EDP_18BPP:
 512                 dev_priv->edp.bpp = 18;
 513                 break;
 514         case EDP_24BPP:
 515                 dev_priv->edp.bpp = 24;
 516                 break;
 517         case EDP_30BPP:
 518                 dev_priv->edp.bpp = 30;
 519                 break;
 520         }
 521
 522         /* Get the eDP sequencing and link info */
 523         edp_pps = &edp->power_seqs[panel_type];
 524         edp_link_params = &edp->link_params[panel_type];
 525
 526         dev_priv->edp.pps = *edp_pps;
 527
 528         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 529                 DP_LINK_BW_1_62;
 530         switch (edp_link_params->lanes) {
 531         case 0:
 532                 dev_priv->edp.lanes = 1;
 533                 break;
 534         case 1:
 535                 dev_priv->edp.lanes = 2;
 536                 break;
 537         case 3:
 538         default:
 539                 dev_priv->edp.lanes = 4;
 540                 break;
 541         }
 542         switch (edp_link_params->preemphasis) {
 543         case 0:
 544                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 545                 break;
 546         case 1:
 547                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 548                 break;
 549         case 2:
 550                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 551                 break;
 552         case 3:
 553                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 554                 break;
 555         }
 556         switch (edp_link_params->vswing) {
 557         case 0:
 558                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 559                 break;
 560         case 1:
 561                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 562                 break;
 563         case 2:
 564                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 565                 break;
 566         case 3:
 567                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 568                 break;
 569         }
 570 }
 571
 572 static void
 573 parse_device_mapping(struct drm_i915_private *dev_priv,
 574                        struct bdb_header *bdb)
 575 {
 576         struct bdb_general_definitions *p_defs;
 577         struct child_device_config *p_child, *child_dev_ptr;
 578         int i, child_device_num, count;
 579         u16     block_size;
 580
 581         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 582         if (!p_defs) {
 583                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 584                 return;
 585         }
 586         /* judge whether the size of child device meets the requirements.
 587          * If the child device size obtained from general definition block
 588          * is different with sizeof(struct child_device_config), skip the
 589          * parsing of sdvo device info
 590          */
 591         if (p_defs->child_dev_size != sizeof(*p_child)) {
 592                 /* different child dev size . Ignore it */
 593                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 594                 return;
 595         }
 596         /* get the block size of general definitions */
 597         block_size = get_blocksize(p_defs);
 598         /* get the number of child device */
 599         child_device_num = (block_size - sizeof(*p_defs)) /
 600                                 sizeof(*p_child);
 601         count = 0;
 602         /* get the number of child device that is present */
 603         for (i = 0; i < child_device_num; i++) {
 604                 p_child = &(p_defs->devices[i]);
 605                 if (!p_child->device_type) {
 606                         /* skip the device block if device type is invalid */
 607                         continue;
 608                 }
 609                 count++;
 610         }
 611         if (!count) {
 612                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 613                 return;
 614         }
 615         dev_priv->child_dev = kmalloc(sizeof(*p_child) * count, M_DRM,
 616             M_WAITOK | M_ZERO);
 617         if (!dev_priv->child_dev) {
 618                 DRM_DEBUG_KMS("No memory space for child device\n");
 619                 return;
 620         }
 621
 622         dev_priv->child_dev_num = count;
 623         count = 0;
 624         for (i = 0; i < child_device_num; i++) {
 625                 p_child = &(p_defs->devices[i]);
 626                 if (!p_child->device_type) {
 627                         /* skip the device block if device type is invalid */
 628                         continue;
 629                 }
 630                 child_dev_ptr = dev_priv->child_dev + count;
 631                 count++;
 632                 memcpy((void *)child_dev_ptr, (void *)p_child,
 633                                         sizeof(*p_child));
 634         }
 635         return;
 636 }
 637
 638 static void
 639 init_vbt_defaults(struct drm_i915_private *dev_priv)
 640 {
 641         struct drm_device *dev = dev_priv->dev;
 642
 643         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 644
 645         /* LFP panel data */
 646         dev_priv->lvds_dither = 1;
 647         dev_priv->lvds_vbt = 0;
 648
 649         /* SDVO panel data */
 650         dev_priv->sdvo_lvds_vbt_mode = NULL;
 651
 652         /* general features */
 653         dev_priv->int_tv_support = 1;
 654         dev_priv->int_crt_support = 1;
 655
 656         /* Default to using SSC */
 657         dev_priv->lvds_use_ssc = 1;
 658         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
 659         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
 660 }
 661
 662 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 663 {
 664         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 665                       "VBIOS ROM for %s\n",
 666                       id->ident);
 667         return 1;
 668 }
 669
 670 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 671         {
 672                 .callback = intel_no_opregion_vbt_callback,
 673                 .ident = "ThinkCentre A57",
 674                 .matches = {
 675                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 676                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 677                 },
 678         },
 679         { }
 680 };
 681
 682 /**
 683  * intel_parse_bios - find VBT and initialize settings from the BIOS
 684  * @dev: DRM device
 685  *
 686  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 687  * to appropriate values.
 688  *
 689  * Returns 0 on success, nonzero on failure.
 690  */
 691 int
 692 intel_parse_bios(struct drm_device *dev)
 693 {
 694         struct drm_i915_private *dev_priv = dev->dev_private;
 695         struct bdb_header *bdb = NULL;
 696         u8 __iomem *bios = NULL;
 697
 698         init_vbt_defaults(dev_priv);
 699
 700         /* XXX Should this validation be moved to intel_opregion.c? */
 701         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 702                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 703                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 704                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 705                                          vbt->signature);
 706                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 707                 } else
 708                         dev_priv->opregion.vbt = NULL;
 709         }
 710         bios = NULL;
 711
 712 #if 1
 713         if (bdb == NULL) {
 714                 KIB_NOTYET();
 715                 return (-1);
 716         }
 717 #else
 718         if (bdb == NULL) {
 719                 struct vbt_header *vbt = NULL;
 720                 size_t size;
 721                 int i;
 722
 723                 bios = pci_map_rom(pdev, &size);
 724                 if (!bios)
 725                         return -1;
 726
 727                 /* Scour memory looking for the VBT signature */
 728                 for (i = 0; i + 4 < size; i++) {
 729                         if (!memcmp(bios + i, "$VBT", 4)) {
 730                                 vbt = (struct vbt_header *)(bios + i);
 731                                 break;
 732                         }
 733                 }
 734
 735                 if (!vbt) {
 736                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 737                         pci_unmap_rom(pdev, bios);
 738                         return -1;
 739                 }
 740
 741                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 742         }
 743 #endif
 744
 745         /* Grab useful general definitions */
 746         parse_general_features(dev_priv, bdb);
 747         parse_general_definitions(dev_priv, bdb);
 748         parse_lfp_panel_data(dev_priv, bdb);
 749         parse_sdvo_panel_data(dev_priv, bdb);
 750         parse_sdvo_device_mapping(dev_priv, bdb);
 751         parse_device_mapping(dev_priv, bdb);
 752         parse_driver_features(dev_priv, bdb);
 753         parse_edp(dev_priv, bdb);
 754
 755 #if 0
 756         if (bios)
 757                 pci_unmap_rom(pdev, bios);
 758 #endif
 759
 760         return 0;
 761 }
 762
 763 /* Ensure that vital registers have been initialised, even if the BIOS
 764  * is absent or just failing to do its job.
 765  */
 766 void intel_setup_bios(struct drm_device *dev)
 767 {
 768         struct drm_i915_private *dev_priv = dev->dev_private;
 769
 770          /* Set the Panel Power On/Off timings if uninitialized. */
 771         if (!HAS_PCH_SPLIT(dev) &&
 772             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 773                 /* Set T2 to 40ms and T5 to 200ms */
 774                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 775
 776                 /* Set T3 to 35ms and Tx to 200ms */
 777                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 778         }
 779 }