kernel/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_EMPH_LEVEL_0;
 120                 break;
 121         case 1:
 122                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
 123                 break;
 124         case 2:
 125                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
 126                 break;
 127         case 3:
 128                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
 129                 break;
 130         }
 131         switch (edp_link_params->vswing) {
 132         case 0:
 133                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
 134                 break;
 135         case 1:
 136                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
 137                 break;
 138         case 2:
 139                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
 140                 break;
 141         case 3:
 142                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
 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 = kmemdup(vbt_lvds_bl, 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         dev_priv->lvds_bl = lvds_bl;
 227 }
 228
 229 /* Try to find integrated panel data */
 230 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 231                             struct bdb_header *bdb)
 232 {
 233         struct bdb_lvds_options *lvds_options;
 234         struct bdb_lvds_lfp_data *lvds_lfp_data;
 235         struct bdb_lvds_lfp_data_entry *entry;
 236         struct lvds_dvo_timing *dvo_timing;
 237         struct drm_display_mode *panel_fixed_mode;
 238
 239         /* Defaults if we can't find VBT info */
 240         dev_priv->lvds_dither = 0;
 241         dev_priv->lvds_vbt = 0;
 242
 243         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 244         if (!lvds_options)
 245                 return;
 246
 247         dev_priv->lvds_dither = lvds_options->pixel_dither;
 248         dev_priv->panel_type = lvds_options->panel_type;
 249
 250         if (lvds_options->panel_type == 0xff)
 251                 return;
 252
 253         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 254         if (!lvds_lfp_data)
 255                 return;
 256
 257
 258         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 259         dvo_timing = &entry->dvo_timing;
 260
 261         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
 262                                       GFP_KERNEL);
 263         if (panel_fixed_mode == NULL) {
 264                 dev_err(dev_priv->dev->dev, "out of memory for fixed panel mode\n");
 265                 return;
 266         }
 267
 268         dev_priv->lvds_vbt = 1;
 269         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 270
 271         if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
 272                 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 273                 drm_mode_debug_printmodeline(panel_fixed_mode);
 274         } else {
 275                 dev_dbg(dev_priv->dev->dev, "ignoring invalid LVDS VBT\n");
 276                 dev_priv->lvds_vbt = 0;
 277                 kfree(panel_fixed_mode);
 278         }
 279         return;
 280 }
 281
 282 /* Try to find sdvo panel data */
 283 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
 284                       struct bdb_header *bdb)
 285 {
 286         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 287         struct lvds_dvo_timing *dvo_timing;
 288         struct drm_display_mode *panel_fixed_mode;
 289
 290         dev_priv->sdvo_lvds_vbt_mode = NULL;
 291
 292         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 293         if (!sdvo_lvds_options)
 294                 return;
 295
 296         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 297         if (!dvo_timing)
 298                 return;
 299
 300         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 301
 302         if (!panel_fixed_mode)
 303                 return;
 304
 305         fill_detail_timing_data(panel_fixed_mode,
 306                         dvo_timing + sdvo_lvds_options->panel_type);
 307
 308         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 309
 310         return;
 311 }
 312
 313 static void parse_general_features(struct drm_psb_private *dev_priv,
 314                        struct bdb_header *bdb)
 315 {
 316         struct bdb_general_features *general;
 317
 318         /* Set sensible defaults in case we can't find the general block */
 319         dev_priv->int_tv_support = 1;
 320         dev_priv->int_crt_support = 1;
 321
 322         general = find_section(bdb, BDB_GENERAL_FEATURES);
 323         if (general) {
 324                 dev_priv->int_tv_support = general->int_tv_support;
 325                 dev_priv->int_crt_support = general->int_crt_support;
 326                 dev_priv->lvds_use_ssc = general->enable_ssc;
 327
 328                 if (dev_priv->lvds_use_ssc) {
 329                         dev_priv->lvds_ssc_freq
 330                                 = general->ssc_freq ? 100 : 96;
 331                 }
 332         }
 333 }
 334
 335 static void
 336 parse_sdvo_device_mapping(struct drm_psb_private *dev_priv,
 337                           struct bdb_header *bdb)
 338 {
 339         struct sdvo_device_mapping *p_mapping;
 340         struct bdb_general_definitions *p_defs;
 341         struct child_device_config *p_child;
 342         int i, child_device_num, count;
 343         u16     block_size;
 344
 345         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 346         if (!p_defs) {
 347                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 348                 return;
 349         }
 350         /* judge whether the size of child device meets the requirements.
 351          * If the child device size obtained from general definition block
 352          * is different with sizeof(struct child_device_config), skip the
 353          * parsing of sdvo device info
 354          */
 355         if (p_defs->child_dev_size != sizeof(*p_child)) {
 356                 /* different child dev size . Ignore it */
 357                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 358                 return;
 359         }
 360         /* get the block size of general definitions */
 361         block_size = get_blocksize(p_defs);
 362         /* get the number of child device */
 363         child_device_num = (block_size - sizeof(*p_defs)) /
 364                                 sizeof(*p_child);
 365         count = 0;
 366         for (i = 0; i < child_device_num; i++) {
 367                 p_child = &(p_defs->devices[i]);
 368                 if (!p_child->device_type) {
 369                         /* skip the device block if device type is invalid */
 370                         continue;
 371                 }
 372                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 373                         p_child->slave_addr != SLAVE_ADDR2) {
 374                         /*
 375                          * If the slave address is neither 0x70 nor 0x72,
 376                          * it is not a SDVO device. Skip it.
 377                          */
 378                         continue;
 379                 }
 380                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 381                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 382                         /* skip the incorrect SDVO port */
 383                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 384                         continue;
 385                 }
 386                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 387                                 " %s port\n",
 388                                 p_child->slave_addr,
 389                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 390                                         "SDVOB" : "SDVOC");
 391                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 392                 if (!p_mapping->initialized) {
 393                         p_mapping->dvo_port = p_child->dvo_port;
 394                         p_mapping->slave_addr = p_child->slave_addr;
 395                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 396                         p_mapping->ddc_pin = p_child->ddc_pin;
 397                         p_mapping->i2c_pin = p_child->i2c_pin;
 398                         p_mapping->initialized = 1;
 399                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 400                                       p_mapping->dvo_port,
 401                                       p_mapping->slave_addr,
 402                                       p_mapping->dvo_wiring,
 403                                       p_mapping->ddc_pin,
 404                                       p_mapping->i2c_pin);
 405                 } else {
 406                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 407                                          "two SDVO device.\n");
 408                 }
 409                 if (p_child->slave2_addr) {
 410                         /* Maybe this is a SDVO device with multiple inputs */
 411                         /* And the mapping info is not added */
 412                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 413                                 " is a SDVO device with multiple inputs.\n");
 414                 }
 415                 count++;
 416         }
 417
 418         if (!count) {
 419                 /* No SDVO device info is found */
 420                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 421         }
 422         return;
 423 }
 424
 425
 426 static void
 427 parse_driver_features(struct drm_psb_private *dev_priv,
 428                       struct bdb_header *bdb)
 429 {
 430         struct bdb_driver_features *driver;
 431
 432         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 433         if (!driver)
 434                 return;
 435
 436         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 437                 dev_priv->edp.support = 1;
 438
 439         /* This bit means to use 96Mhz for DPLL_A or not */
 440         if (driver->primary_lfp_id)
 441                 dev_priv->dplla_96mhz = true;
 442         else
 443                 dev_priv->dplla_96mhz = false;
 444 }
 445
 446 static void
 447 parse_device_mapping(struct drm_psb_private *dev_priv,
 448                        struct bdb_header *bdb)
 449 {
 450         struct bdb_general_definitions *p_defs;
 451         struct child_device_config *p_child, *child_dev_ptr;
 452         int i, child_device_num, count;
 453         u16     block_size;
 454
 455         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 456         if (!p_defs) {
 457                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 458                 return;
 459         }
 460         /* judge whether the size of child device meets the requirements.
 461          * If the child device size obtained from general definition block
 462          * is different with sizeof(struct child_device_config), skip the
 463          * parsing of sdvo device info
 464          */
 465         if (p_defs->child_dev_size != sizeof(*p_child)) {
 466                 /* different child dev size . Ignore it */
 467                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 468                 return;
 469         }
 470         /* get the block size of general definitions */
 471         block_size = get_blocksize(p_defs);
 472         /* get the number of child device */
 473         child_device_num = (block_size - sizeof(*p_defs)) /
 474                                 sizeof(*p_child);
 475         count = 0;
 476         /* get the number of child devices that are present */
 477         for (i = 0; i < child_device_num; i++) {
 478                 p_child = &(p_defs->devices[i]);
 479                 if (!p_child->device_type) {
 480                         /* skip the device block if device type is invalid */
 481                         continue;
 482                 }
 483                 count++;
 484         }
 485         if (!count) {
 486                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 487                 return;
 488         }
 489         dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 490         if (!dev_priv->child_dev) {
 491                 DRM_DEBUG_KMS("No memory space for child devices\n");
 492                 return;
 493         }
 494
 495         dev_priv->child_dev_num = count;
 496         count = 0;
 497         for (i = 0; i < child_device_num; i++) {
 498                 p_child = &(p_defs->devices[i]);
 499                 if (!p_child->device_type) {
 500                         /* skip the device block if device type is invalid */
 501                         continue;
 502                 }
 503                 child_dev_ptr = dev_priv->child_dev + count;
 504                 count++;
 505                 memcpy((void *)child_dev_ptr, (void *)p_child,
 506                                         sizeof(*p_child));
 507         }
 508         return;
 509 }
 510
 511
 512 /**
 513  * psb_intel_init_bios - initialize VBIOS settings & find VBT
 514  * @dev: DRM device
 515  *
 516  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 517  * to appropriate values.
 518  *
 519  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 520  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 521  * feed an updated VBT back through that, compared to what we'll fetch using
 522  * this method of groping around in the BIOS data.
 523  *
 524  * Returns 0 on success, nonzero on failure.
 525  */
 526 int psb_intel_init_bios(struct drm_device *dev)
 527 {
 528         struct drm_psb_private *dev_priv = dev->dev_private;
 529         struct pci_dev *pdev = dev->pdev;
 530         struct vbt_header *vbt = NULL;
 531         struct bdb_header *bdb = NULL;
 532         u8 __iomem *bios = NULL;
 533         size_t size;
 534         int i;
 535
 536
 537         dev_priv->panel_type = 0xff;
 538
 539         /* XXX Should this validation be moved to intel_opregion.c? */
 540         if (dev_priv->opregion.vbt) {
 541                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 542                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 543                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 544                                          vbt->signature);
 545                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 546                 } else
 547                         dev_priv->opregion.vbt = NULL;
 548         }
 549
 550         if (bdb == NULL) {
 551                 bios = pci_map_rom(pdev, &size);
 552                 if (!bios)
 553                         return -1;
 554
 555                 /* Scour memory looking for the VBT signature */
 556                 for (i = 0; i + 4 < size; i++) {
 557                         if (!memcmp(bios + i, "$VBT", 4)) {
 558                                 vbt = (struct vbt_header *)(bios + i);
 559                                 break;
 560                         }
 561                 }
 562
 563                 if (!vbt) {
 564                         dev_err(dev->dev, "VBT signature missing\n");
 565                         pci_unmap_rom(pdev, bios);
 566                         return -1;
 567                 }
 568                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 569         }
 570
 571         /* Grab useful general dxefinitions */
 572         parse_general_features(dev_priv, bdb);
 573         parse_driver_features(dev_priv, bdb);
 574         parse_lfp_panel_data(dev_priv, bdb);
 575         parse_sdvo_panel_data(dev_priv, bdb);
 576         parse_sdvo_device_mapping(dev_priv, bdb);
 577         parse_device_mapping(dev_priv, bdb);
 578         parse_backlight_data(dev_priv, bdb);
 579         parse_edp(dev_priv, bdb);
 580
 581         if (bios)
 582                 pci_unmap_rom(pdev, bios);
 583
 584         return 0;
 585 }
 586
 587 /**
 588  * Destroy and free VBT data
 589  */
 590 void psb_intel_destroy_bios(struct drm_device *dev)
 591 {
 592         struct drm_psb_private *dev_priv = dev->dev_private;
 593
 594         kfree(dev_priv->sdvo_lvds_vbt_mode);
 595         kfree(dev_priv->lfp_lvds_vbt_mode);
 596         kfree(dev_priv->lvds_bl);
 597 }