drivers/gpu/drm/gma500/intel_bios.c

   1 /*
   2  * Copyright (c) 2006 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *    Eric Anholt <eric@anholt.net>
  19  *
  20  */
  21 #include <drm/drmP.h>
  22 #include <drm/drm.h>
  23 #include <drm/gma_drm.h>
  24 #include "psb_drv.h"
  25 #include "psb_intel_drv.h"
  26 #include "psb_intel_reg.h"
  27 #include "intel_bios.h"
  28
  29 #define SLAVE_ADDR1     0x70
  30 #define SLAVE_ADDR2     0x72
  31
  32 static void *find_section(struct bdb_header *bdb, int section_id)
  33 {
  34         u8 *base = (u8 *)bdb;
  35         int index = 0;
  36         u16 total, current_size;
  37         u8 current_id;
  38
  39         /* skip to first section */
  40         index += bdb->header_size;
  41         total = bdb->bdb_size;
  42
  43         /* walk the sections looking for section_id */
  44         while (index < total) {
  45                 current_id = *(base + index);
  46                 index++;
  47                 current_size = *((u16 *)(base + index));
  48                 index += 2;
  49                 if (current_id == section_id)
  50                         return base + index;
  51                 index += current_size;
  52         }
  53
  54         return NULL;
  55 }
  56
  57 static void
  58 parse_edp(struct drm_psb_private *dev_priv, struct bdb_header *bdb)
  59 {
  60         struct bdb_edp *edp;
  61         struct edp_power_seq *edp_pps;
  62         struct edp_link_params *edp_link_params;
  63         uint8_t panel_type;
  64
  65         edp = find_section(bdb, BDB_EDP);
  66
  67         dev_priv->edp.bpp = 18;
  68         if (!edp) {
  69                 if (dev_priv->edp.support) {
  70                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported, assume %dbpp panel color depth.\n",
  71                                       dev_priv->edp.bpp);
  72                 }
  73                 return;
  74         }
  75
  76         panel_type = dev_priv->panel_type;
  77         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
  78         case EDP_18BPP:
  79                 dev_priv->edp.bpp = 18;
  80                 break;
  81         case EDP_24BPP:
  82                 dev_priv->edp.bpp = 24;
  83                 break;
  84         case EDP_30BPP:
  85                 dev_priv->edp.bpp = 30;
  86                 break;
  87         }
  88
  89         /* Get the eDP sequencing and link info */
  90         edp_pps = &edp->power_seqs[panel_type];
  91         edp_link_params = &edp->link_params[panel_type];
  92
  93         dev_priv->edp.pps = *edp_pps;
  94
  95         DRM_DEBUG_KMS("EDP timing in vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
  96                                 dev_priv->edp.pps.t1_t3, dev_priv->edp.pps.t8,
  97                                 dev_priv->edp.pps.t9, dev_priv->edp.pps.t10,
  98                                 dev_priv->edp.pps.t11_t12);
  99
 100         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 101                 DP_LINK_BW_1_62;
 102         switch (edp_link_params->lanes) {
 103         case 0:
 104                 dev_priv->edp.lanes = 1;
 105                 break;
 106         case 1:
 107                 dev_priv->edp.lanes = 2;
 108                 break;
 109         case 3:
 110         default:
 111                 dev_priv->edp.lanes = 4;
 112                 break;
 113         }
 114         DRM_DEBUG_KMS("VBT reports EDP: Lane_count %d, Lane_rate %d, Bpp %d\n",
 115                         dev_priv->edp.lanes, dev_priv->edp.rate, dev_priv->edp.bpp);
 116
 117         switch (edp_link_params->preemphasis) {
 118         case 0:
 119                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 120                 break;
 121         case 1:
 122                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 123                 break;
 124         case 2:
 125                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 126                 break;
 127         case 3:
 128                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 129                 break;
 130         }
 131         switch (edp_link_params->vswing) {
 132         case 0:
 133                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
 134                 break;
 135         case 1:
 136                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
 137                 break;
 138         case 2:
 139                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
 140                 break;
 141         case 3:
 142                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 143                 break;
 144         }
 145         DRM_DEBUG_KMS("VBT reports EDP: VSwing  %d, Preemph %d\n",
 146                         dev_priv->edp.vswing, dev_priv->edp.preemphasis);
 147 }
 148
 149 static u16
 150 get_blocksize(void *p)
 151 {
 152         u16 *block_ptr, block_size;
 153
 154         block_ptr = (u16 *)((char *)p - 2);
 155         block_size = *block_ptr;
 156         return block_size;
 157 }
 158
 159 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
 160                         struct lvds_dvo_timing *dvo_timing)
 161 {
 162         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
 163                 dvo_timing->hactive_lo;
 164         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
 165                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
 166         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
 167                 dvo_timing->hsync_pulse_width;
 168         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
 169                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
 170
 171         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
 172                 dvo_timing->vactive_lo;
 173         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
 174                 dvo_timing->vsync_off;
 175         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
 176                 dvo_timing->vsync_pulse_width;
 177         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
 178                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
 179         panel_fixed_mode->clock = dvo_timing->clock * 10;
 180         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
 181
 182         if (dvo_timing->hsync_positive)
 183                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 184         else
 185                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 186
 187         if (dvo_timing->vsync_positive)
 188                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 189         else
 190                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 191
 192         /* Some VBTs have bogus h/vtotal values */
 193         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 194                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 195         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 196                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 197
 198         drm_mode_set_name(panel_fixed_mode);
 199 }
 200
 201 static void parse_backlight_data(struct drm_psb_private *dev_priv,
 202                                 struct bdb_header *bdb)
 203 {
 204         struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
 205         struct bdb_lvds_backlight *lvds_bl;
 206         u8 p_type = 0;
 207         void *bl_start = NULL;
 208         struct bdb_lvds_options *lvds_opts
 209                                 = find_section(bdb, BDB_LVDS_OPTIONS);
 210
 211         dev_priv->lvds_bl = NULL;
 212
 213         if (lvds_opts)
 214                 p_type = lvds_opts->panel_type;
 215         else
 216                 return;
 217
 218         bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
 219         vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
 220
 221         lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
 222         if (!lvds_bl) {
 223                 dev_err(dev_priv->dev->dev, "out of memory for backlight data\n");
 224                 return;
 225         }
 226         memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
 227         dev_priv->lvds_bl = lvds_bl;
 228 }
 229
 230 /* Try to find integrated panel data */
 231 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 232                             struct bdb_header *bdb)
 233 {
 234         struct bdb_lvds_options *lvds_options;
 235         struct bdb_lvds_lfp_data *lvds_lfp_data;
 236         struct bdb_lvds_lfp_data_entry *entry;
 237         struct lvds_dvo_timing *dvo_timing;
 238         struct drm_display_mode *panel_fixed_mode;
 239
 240         /* Defaults if we can't find VBT info */
 241         dev_priv->lvds_dither = 0;
 242         dev_priv->lvds_vbt = 0;
 243
 244         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 245         if (!lvds_options)
 246                 return;
 247
 248         dev_priv->lvds_dither = lvds_options->pixel_dither;
 249         dev_priv->panel_type = lvds_options->panel_type;
 250
 251         if (lvds_options->panel_type == 0xff)
 252                 return;
 253
 254         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 255         if (!lvds_lfp_data)
 256                 return;
 257
 258
 259         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 260         dvo_timing = &entry->dvo_timing;
 261
 262         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
 263                                       GFP_KERNEL);
 264         if (panel_fixed_mode == NULL) {
 265                 dev_err(dev_priv->dev->dev, "out of memory for fixed panel mode\n");
 266                 return;
 267         }
 268
 269         dev_priv->lvds_vbt = 1;
 270         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 271
 272         if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
 273                 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 274                 drm_mode_debug_printmodeline(panel_fixed_mode);
 275         } else {
 276                 dev_dbg(dev_priv->dev->dev, "ignoring invalid LVDS VBT\n");
 277                 dev_priv->lvds_vbt = 0;
 278                 kfree(panel_fixed_mode);
 279         }
 280         return;
 281 }
 282
 283 /* Try to find sdvo panel data */
 284 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
 285                       struct bdb_header *bdb)
 286 {
 287         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 288         struct lvds_dvo_timing *dvo_timing;
 289         struct drm_display_mode *panel_fixed_mode;
 290
 291         dev_priv->sdvo_lvds_vbt_mode = NULL;
 292
 293         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 294         if (!sdvo_lvds_options)
 295                 return;
 296
 297         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 298         if (!dvo_timing)
 299                 return;
 300
 301         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 302
 303         if (!panel_fixed_mode)
 304                 return;
 305
 306         fill_detail_timing_data(panel_fixed_mode,
 307                         dvo_timing + sdvo_lvds_options->panel_type);
 308
 309         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 310
 311         return;
 312 }
 313
 314 static void parse_general_features(struct drm_psb_private *dev_priv,
 315                        struct bdb_header *bdb)
 316 {
 317         struct bdb_general_features *general;
 318
 319         /* Set sensible defaults in case we can't find the general block */
 320         dev_priv->int_tv_support = 1;
 321         dev_priv->int_crt_support = 1;
 322
 323         general = find_section(bdb, BDB_GENERAL_FEATURES);
 324         if (general) {
 325                 dev_priv->int_tv_support = general->int_tv_support;
 326                 dev_priv->int_crt_support = general->int_crt_support;
 327                 dev_priv->lvds_use_ssc = general->enable_ssc;
 328
 329                 if (dev_priv->lvds_use_ssc) {
 330                         dev_priv->lvds_ssc_freq
 331                                 = general->ssc_freq ? 100 : 96;
 332                 }
 333         }
 334 }
 335
 336 static void
 337 parse_sdvo_device_mapping(struct drm_psb_private *dev_priv,
 338                           struct bdb_header *bdb)
 339 {
 340         struct sdvo_device_mapping *p_mapping;
 341         struct bdb_general_definitions *p_defs;
 342         struct child_device_config *p_child;
 343         int i, child_device_num, count;
 344         u16     block_size;
 345
 346         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 347         if (!p_defs) {
 348                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 349                 return;
 350         }
 351         /* judge whether the size of child device meets the requirements.
 352          * If the child device size obtained from general definition block
 353          * is different with sizeof(struct child_device_config), skip the
 354          * parsing of sdvo device info
 355          */
 356         if (p_defs->child_dev_size != sizeof(*p_child)) {
 357                 /* different child dev size . Ignore it */
 358                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 359                 return;
 360         }
 361         /* get the block size of general definitions */
 362         block_size = get_blocksize(p_defs);
 363         /* get the number of child device */
 364         child_device_num = (block_size - sizeof(*p_defs)) /
 365                                 sizeof(*p_child);
 366         count = 0;
 367         for (i = 0; i < child_device_num; i++) {
 368                 p_child = &(p_defs->devices[i]);
 369                 if (!p_child->device_type) {
 370                         /* skip the device block if device type is invalid */
 371                         continue;
 372                 }
 373                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 374                         p_child->slave_addr != SLAVE_ADDR2) {
 375                         /*
 376                          * If the slave address is neither 0x70 nor 0x72,
 377                          * it is not a SDVO device. Skip it.
 378                          */
 379                         continue;
 380                 }
 381                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 382                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 383                         /* skip the incorrect SDVO port */
 384                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 385                         continue;
 386                 }
 387                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 388                                 " %s port\n",
 389                                 p_child->slave_addr,
 390                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 391                                         "SDVOB" : "SDVOC");
 392                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 393                 if (!p_mapping->initialized) {
 394                         p_mapping->dvo_port = p_child->dvo_port;
 395                         p_mapping->slave_addr = p_child->slave_addr;
 396                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 397                         p_mapping->ddc_pin = p_child->ddc_pin;
 398                         p_mapping->i2c_pin = p_child->i2c_pin;
 399                         p_mapping->initialized = 1;
 400                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 401                                       p_mapping->dvo_port,
 402                                       p_mapping->slave_addr,
 403                                       p_mapping->dvo_wiring,
 404                                       p_mapping->ddc_pin,
 405                                       p_mapping->i2c_pin);
 406                 } else {
 407                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 408                                          "two SDVO device.\n");
 409                 }
 410                 if (p_child->slave2_addr) {
 411                         /* Maybe this is a SDVO device with multiple inputs */
 412                         /* And the mapping info is not added */
 413                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 414                                 " is a SDVO device with multiple inputs.\n");
 415                 }
 416                 count++;
 417         }
 418
 419         if (!count) {
 420                 /* No SDVO device info is found */
 421                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 422         }
 423         return;
 424 }
 425
 426
 427 static void
 428 parse_driver_features(struct drm_psb_private *dev_priv,
 429                       struct bdb_header *bdb)
 430 {
 431         struct bdb_driver_features *driver;
 432
 433         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 434         if (!driver)
 435                 return;
 436
 437         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 438                 dev_priv->edp.support = 1;
 439
 440         /* This bit means to use 96Mhz for DPLL_A or not */
 441         if (driver->primary_lfp_id)
 442                 dev_priv->dplla_96mhz = true;
 443         else
 444                 dev_priv->dplla_96mhz = false;
 445 }
 446
 447 static void
 448 parse_device_mapping(struct drm_psb_private *dev_priv,
 449                        struct bdb_header *bdb)
 450 {
 451         struct bdb_general_definitions *p_defs;
 452         struct child_device_config *p_child, *child_dev_ptr;
 453         int i, child_device_num, count;
 454         u16     block_size;
 455
 456         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 457         if (!p_defs) {
 458                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 459                 return;
 460         }
 461         /* judge whether the size of child device meets the requirements.
 462          * If the child device size obtained from general definition block
 463          * is different with sizeof(struct child_device_config), skip the
 464          * parsing of sdvo device info
 465          */
 466         if (p_defs->child_dev_size != sizeof(*p_child)) {
 467                 /* different child dev size . Ignore it */
 468                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 469                 return;
 470         }
 471         /* get the block size of general definitions */
 472         block_size = get_blocksize(p_defs);
 473         /* get the number of child device */
 474         child_device_num = (block_size - sizeof(*p_defs)) /
 475                                 sizeof(*p_child);
 476         count = 0;
 477         /* get the number of child devices that are present */
 478         for (i = 0; i < child_device_num; i++) {
 479                 p_child = &(p_defs->devices[i]);
 480                 if (!p_child->device_type) {
 481                         /* skip the device block if device type is invalid */
 482                         continue;
 483                 }
 484                 count++;
 485         }
 486         if (!count) {
 487                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 488                 return;
 489         }
 490         dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 491         if (!dev_priv->child_dev) {
 492                 DRM_DEBUG_KMS("No memory space for child devices\n");
 493                 return;
 494         }
 495
 496         dev_priv->child_dev_num = count;
 497         count = 0;
 498         for (i = 0; i < child_device_num; i++) {
 499                 p_child = &(p_defs->devices[i]);
 500                 if (!p_child->device_type) {
 501                         /* skip the device block if device type is invalid */
 502                         continue;
 503                 }
 504                 child_dev_ptr = dev_priv->child_dev + count;
 505                 count++;
 506                 memcpy((void *)child_dev_ptr, (void *)p_child,
 507                                         sizeof(*p_child));
 508         }
 509         return;
 510 }
 511
 512
 513 /**
 514  * psb_intel_init_bios - initialize VBIOS settings & find VBT
 515  * @dev: DRM device
 516  *
 517  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 518  * to appropriate values.
 519  *
 520  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 521  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 522  * feed an updated VBT back through that, compared to what we'll fetch using
 523  * this method of groping around in the BIOS data.
 524  *
 525  * Returns 0 on success, nonzero on failure.
 526  */
 527 int psb_intel_init_bios(struct drm_device *dev)
 528 {
 529         struct drm_psb_private *dev_priv = dev->dev_private;
 530         struct pci_dev *pdev = dev->pdev;
 531         struct vbt_header *vbt = NULL;
 532         struct bdb_header *bdb = NULL;
 533         u8 __iomem *bios = NULL;
 534         size_t size;
 535         int i;
 536
 537
 538         dev_priv->panel_type = 0xff;
 539
 540         /* XXX Should this validation be moved to intel_opregion.c? */
 541         if (dev_priv->opregion.vbt) {
 542                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 543                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 544                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 545                                          vbt->signature);
 546                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 547                 } else
 548                         dev_priv->opregion.vbt = NULL;
 549         }
 550
 551         if (bdb == NULL) {
 552                 bios = pci_map_rom(pdev, &size);
 553                 if (!bios)
 554                         return -1;
 555
 556                 /* Scour memory looking for the VBT signature */
 557                 for (i = 0; i + 4 < size; i++) {
 558                         if (!memcmp(bios + i, "$VBT", 4)) {
 559                                 vbt = (struct vbt_header *)(bios + i);
 560                                 break;
 561                         }
 562                 }
 563
 564                 if (!vbt) {
 565                         dev_err(dev->dev, "VBT signature missing\n");
 566                         pci_unmap_rom(pdev, bios);
 567                         return -1;
 568                 }
 569                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 570         }
 571
 572         /* Grab useful general dxefinitions */
 573         parse_general_features(dev_priv, bdb);
 574         parse_driver_features(dev_priv, bdb);
 575         parse_lfp_panel_data(dev_priv, bdb);
 576         parse_sdvo_panel_data(dev_priv, bdb);
 577         parse_sdvo_device_mapping(dev_priv, bdb);
 578         parse_device_mapping(dev_priv, bdb);
 579         parse_backlight_data(dev_priv, bdb);
 580         parse_edp(dev_priv, bdb);
 581
 582         if (bios)
 583                 pci_unmap_rom(pdev, bios);
 584
 585         return 0;
 586 }
 587
 588 /**
 589  * Destroy and free VBT data
 590  */
 591 void psb_intel_destroy_bios(struct drm_device *dev)
 592 {
 593         struct drm_psb_private *dev_priv = dev->dev_private;
 594
 595         kfree(dev_priv->sdvo_lvds_vbt_mode);
 596         kfree(dev_priv->lfp_lvds_vbt_mode);
 597         kfree(dev_priv->lvds_bl);
 598 }