1/* 2 * Copyright © 2006 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 * SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric@anholt.net> 25 * 26 */ 27#include <linux/dmi.h> 28#include <drm/drm_dp_helper.h> 29#include <drm/drmP.h> 30#include <drm/i915_drm.h> 31#include "i915_drv.h" 32#include "intel_bios.h" 33 34#define SLAVE_ADDR1 0x70 35#define SLAVE_ADDR2 0x72 36 37static int panel_type; 38 39static void * 40find_section(struct bdb_header *bdb, int section_id) 41{ 42 u8 *base = (u8 *)bdb; 43 int index = 0; 44 u16 total, current_size; 45 u8 current_id; 46 47 /* skip to first section */ 48 index += bdb->header_size; 49 total = bdb->bdb_size; 50 51 /* walk the sections looking for section_id */ 52 while (index + 3 < total) { 53 current_id = *(base + index); 54 index++; 55 56 current_size = *((u16 *)(base + index)); 57 index += 2; 58 59 if (index + current_size > total) 60 return NULL; 61 62 if (current_id == section_id) 63 return base + index; 64 65 index += current_size; 66 } 67 68 return NULL; 69} 70 71static u16 72get_blocksize(void *p) 73{ 74 u16 *block_ptr, block_size; 75 76 block_ptr = (u16 *)((char *)p - 2); 77 block_size = *block_ptr; 78 return block_size; 79} 80 81static void 82fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode, 83 const struct lvds_dvo_timing *dvo_timing) 84{ 85 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) | 86 dvo_timing->hactive_lo; 87 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay + 88 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo); 89 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start + 90 dvo_timing->hsync_pulse_width; 91 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay + 92 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo); 93 94 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) | 95 dvo_timing->vactive_lo; 96 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay + 97 dvo_timing->vsync_off; 98 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start + 99 dvo_timing->vsync_pulse_width; 100 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay + 101 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo); 102 panel_fixed_mode->clock = dvo_timing->clock * 10; 103 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED; 104 105 if (dvo_timing->hsync_positive) 106 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC; 107 else 108 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC; 109 110 if (dvo_timing->vsync_positive) 111 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC; 112 else 113 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC; 114 115 /* Some VBTs have bogus h/vtotal values */ 116 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal) 117 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1; 118 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal) 119 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1; 120 121 drm_mode_set_name(panel_fixed_mode); 122} 123 124static bool 125lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a, 126 const struct lvds_dvo_timing *b) 127{ 128 if (a->hactive_hi != b->hactive_hi || 129 a->hactive_lo != b->hactive_lo) 130 return false; 131 132 if (a->hsync_off_hi != b->hsync_off_hi || 133 a->hsync_off_lo != b->hsync_off_lo) 134 return false; 135 136 if (a->hsync_pulse_width != b->hsync_pulse_width) 137 return false; 138 139 if (a->hblank_hi != b->hblank_hi || 140 a->hblank_lo != b->hblank_lo) 141 return false; 142 143 if (a->vactive_hi != b->vactive_hi || 144 a->vactive_lo != b->vactive_lo) 145 return false; 146 147 if (a->vsync_off != b->vsync_off) 148 return false; 149 150 if (a->vsync_pulse_width != b->vsync_pulse_width) 151 return false; 152 153 if (a->vblank_hi != b->vblank_hi || 154 a->vblank_lo != b->vblank_lo) 155 return false; 156 157 return true; 158} 159 160static const struct lvds_dvo_timing * 161get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data, 162 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs, 163 int index) 164{ 165 /* 166 * the size of fp_timing varies on the different platform. 167 * So calculate the DVO timing relative offset in LVDS data 168 * entry to get the DVO timing entry 169 */ 170 171 int lfp_data_size = 172 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset - 173 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset; 174 int dvo_timing_offset = 175 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset - 176 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset; 177 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index; 178 179 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset); 180} 181 182/* get lvds_fp_timing entry 183 * this function may return NULL if the corresponding entry is invalid 184 */ 185static const struct lvds_fp_timing * 186get_lvds_fp_timing(const struct bdb_header *bdb, 187 const struct bdb_lvds_lfp_data *data, 188 const struct bdb_lvds_lfp_data_ptrs *ptrs, 189 int index) 190{ 191 size_t data_ofs = (const u8 *)data - (const u8 *)bdb; 192 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */ 193 size_t ofs; 194 195 if (index >= ARRAY_SIZE(ptrs->ptr)) 196 return NULL; 197 ofs = ptrs->ptr[index].fp_timing_offset; 198 if (ofs < data_ofs || 199 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size) 200 return NULL; 201 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs); 202} 203 204/* Try to find integrated panel data */ 205static void 206parse_lfp_panel_data(struct drm_i915_private *dev_priv, 207 struct bdb_header *bdb) 208{ 209 const struct bdb_lvds_options *lvds_options; 210 const struct bdb_lvds_lfp_data *lvds_lfp_data; 211 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs; 212 const struct lvds_dvo_timing *panel_dvo_timing; 213 const struct lvds_fp_timing *fp_timing; 214 struct drm_display_mode *panel_fixed_mode; 215 int i, downclock, drrs_mode; 216 217 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS); 218 if (!lvds_options) 219 return; 220 221 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither; 222 if (lvds_options->panel_type == 0xff) 223 return; 224 225 panel_type = lvds_options->panel_type; 226 227 drrs_mode = (lvds_options->dps_panel_type_bits 228 >> (panel_type * 2)) & MODE_MASK; 229 /* 230 * VBT has static DRRS = 0 and seamless DRRS = 2. 231 * The below piece of code is required to adjust vbt.drrs_type 232 * to match the enum drrs_support_type. 233 */ 234 switch (drrs_mode) { 235 case 0: 236 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT; 237 DRM_DEBUG_KMS("DRRS supported mode is static\n"); 238 break; 239 case 2: 240 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT; 241 DRM_DEBUG_KMS("DRRS supported mode is seamless\n"); 242 break; 243 default: 244 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; 245 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n"); 246 break; 247 } 248 249 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA); 250 if (!lvds_lfp_data) 251 return; 252 253 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS); 254 if (!lvds_lfp_data_ptrs) 255 return; 256 257 dev_priv->vbt.lvds_vbt = 1; 258 259 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data, 260 lvds_lfp_data_ptrs, 261 lvds_options->panel_type); 262 263 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 264 if (!panel_fixed_mode) 265 return; 266 267 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing); 268 269 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode; 270 271 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n"); 272 drm_mode_debug_printmodeline(panel_fixed_mode); 273 274 /* 275 * Iterate over the LVDS panel timing info to find the lowest clock 276 * for the native resolution. 277 */ 278 downclock = panel_dvo_timing->clock; 279 for (i = 0; i < 16; i++) { 280 const struct lvds_dvo_timing *dvo_timing; 281 282 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data, 283 lvds_lfp_data_ptrs, 284 i); 285 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) && 286 dvo_timing->clock < downclock) 287 downclock = dvo_timing->clock; 288 } 289 290 if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) { 291 dev_priv->lvds_downclock_avail = 1; 292 dev_priv->lvds_downclock = downclock * 10; 293 DRM_DEBUG_KMS("LVDS downclock is found in VBT. " 294 "Normal Clock %dKHz, downclock %dKHz\n", 295 panel_fixed_mode->clock, 10*downclock); 296 } 297 298 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data, 299 lvds_lfp_data_ptrs, 300 lvds_options->panel_type); 301 if (fp_timing) { 302 /* check the resolution, just to be sure */ 303 if (fp_timing->x_res == panel_fixed_mode->hdisplay && 304 fp_timing->y_res == panel_fixed_mode->vdisplay) { 305 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val; 306 DRM_DEBUG_KMS("VBT initial LVDS value %x\n", 307 dev_priv->vbt.bios_lvds_val); 308 } 309 } 310} 311 312static void 313parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb) 314{ 315 const struct bdb_lfp_backlight_data *backlight_data; 316 const struct bdb_lfp_backlight_data_entry *entry; 317 318 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT); 319 if (!backlight_data) 320 return; 321 322 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) { 323 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n", 324 backlight_data->entry_size); 325 return; 326 } 327 328 entry = &backlight_data->data[panel_type]; 329 330 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM; 331 if (!dev_priv->vbt.backlight.present) { 332 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n", 333 entry->type); 334 return; 335 } 336 337 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz; 338 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm; 339 dev_priv->vbt.backlight.min_brightness = entry->min_brightness; 340 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, " 341 "active %s, min brightness %u, level %u\n", 342 dev_priv->vbt.backlight.pwm_freq_hz, 343 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high", 344 dev_priv->vbt.backlight.min_brightness, 345 backlight_data->level[panel_type]); 346} 347 348/* Try to find sdvo panel data */ 349static void 350parse_sdvo_panel_data(struct drm_i915_private *dev_priv, 351 struct bdb_header *bdb) 352{ 353 struct lvds_dvo_timing *dvo_timing; 354 struct drm_display_mode *panel_fixed_mode; 355 int index; 356 357 index = i915.vbt_sdvo_panel_type; 358 if (index == -2) { 359 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n"); 360 return; 361 } 362 363 if (index == -1) { 364 struct bdb_sdvo_lvds_options *sdvo_lvds_options; 365 366 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS); 367 if (!sdvo_lvds_options) 368 return; 369 370 index = sdvo_lvds_options->panel_type; 371 } 372 373 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS); 374 if (!dvo_timing) 375 return; 376 377 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 378 if (!panel_fixed_mode) 379 return; 380 381 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index); 382 383 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode; 384 385 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n"); 386 drm_mode_debug_printmodeline(panel_fixed_mode); 387} 388 389static int intel_bios_ssc_frequency(struct drm_device *dev, 390 bool alternate) 391{ 392 switch (INTEL_INFO(dev)->gen) { 393 case 2: 394 return alternate ? 66667 : 48000; 395 case 3: 396 case 4: 397 return alternate ? 100000 : 96000; 398 default: 399 return alternate ? 100000 : 120000; 400 } 401} 402 403static void 404parse_general_features(struct drm_i915_private *dev_priv, 405 struct bdb_header *bdb) 406{ 407 struct drm_device *dev = dev_priv->dev; 408 struct bdb_general_features *general; 409 410 general = find_section(bdb, BDB_GENERAL_FEATURES); 411 if (general) { 412 dev_priv->vbt.int_tv_support = general->int_tv_support; 413 dev_priv->vbt.int_crt_support = general->int_crt_support; 414 dev_priv->vbt.lvds_use_ssc = general->enable_ssc; 415 dev_priv->vbt.lvds_ssc_freq = 416 intel_bios_ssc_frequency(dev, general->ssc_freq); 417 dev_priv->vbt.display_clock_mode = general->display_clock_mode; 418 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted; 419 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", 420 dev_priv->vbt.int_tv_support, 421 dev_priv->vbt.int_crt_support, 422 dev_priv->vbt.lvds_use_ssc, 423 dev_priv->vbt.lvds_ssc_freq, 424 dev_priv->vbt.display_clock_mode, 425 dev_priv->vbt.fdi_rx_polarity_inverted); 426 } 427} 428 429static void 430parse_general_definitions(struct drm_i915_private *dev_priv, 431 struct bdb_header *bdb) 432{ 433 struct bdb_general_definitions *general; 434 435 general = find_section(bdb, BDB_GENERAL_DEFINITIONS); 436 if (general) { 437 u16 block_size = get_blocksize(general); 438 if (block_size >= sizeof(*general)) { 439 int bus_pin = general->crt_ddc_gmbus_pin; 440 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin); 441 if (intel_gmbus_is_port_valid(bus_pin)) 442 dev_priv->vbt.crt_ddc_pin = bus_pin; 443 } else { 444 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n", 445 block_size); 446 } 447 } 448} 449 450static void 451parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, 452 struct bdb_header *bdb) 453{ 454 struct sdvo_device_mapping *p_mapping; 455 struct bdb_general_definitions *p_defs; 456 union child_device_config *p_child; 457 int i, child_device_num, count; 458 u16 block_size; 459 460 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 461 if (!p_defs) { 462 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n"); 463 return; 464 } 465 /* judge whether the size of child device meets the requirements. 466 * If the child device size obtained from general definition block 467 * is different with sizeof(struct child_device_config), skip the 468 * parsing of sdvo device info 469 */ 470 if (p_defs->child_dev_size != sizeof(*p_child)) { 471 /* different child dev size . Ignore it */ 472 DRM_DEBUG_KMS("different child size is found. Invalid.\n"); 473 return; 474 } 475 /* get the block size of general definitions */ 476 block_size = get_blocksize(p_defs); 477 /* get the number of child device */ 478 child_device_num = (block_size - sizeof(*p_defs)) / 479 sizeof(*p_child); 480 count = 0; 481 for (i = 0; i < child_device_num; i++) { 482 p_child = &(p_defs->devices[i]); 483 if (!p_child->old.device_type) { 484 /* skip the device block if device type is invalid */ 485 continue; 486 } 487 if (p_child->old.slave_addr != SLAVE_ADDR1 && 488 p_child->old.slave_addr != SLAVE_ADDR2) { 489 /* 490 * If the slave address is neither 0x70 nor 0x72, 491 * it is not a SDVO device. Skip it. 492 */ 493 continue; 494 } 495 if (p_child->old.dvo_port != DEVICE_PORT_DVOB && 496 p_child->old.dvo_port != DEVICE_PORT_DVOC) { 497 /* skip the incorrect SDVO port */ 498 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n"); 499 continue; 500 } 501 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on" 502 " %s port\n", 503 p_child->old.slave_addr, 504 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ? 505 "SDVOB" : "SDVOC"); 506 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]); 507 if (!p_mapping->initialized) { 508 p_mapping->dvo_port = p_child->old.dvo_port; 509 p_mapping->slave_addr = p_child->old.slave_addr; 510 p_mapping->dvo_wiring = p_child->old.dvo_wiring; 511 p_mapping->ddc_pin = p_child->old.ddc_pin; 512 p_mapping->i2c_pin = p_child->old.i2c_pin; 513 p_mapping->initialized = 1; 514 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n", 515 p_mapping->dvo_port, 516 p_mapping->slave_addr, 517 p_mapping->dvo_wiring, 518 p_mapping->ddc_pin, 519 p_mapping->i2c_pin); 520 } else { 521 DRM_DEBUG_KMS("Maybe one SDVO port is shared by " 522 "two SDVO device.\n"); 523 } 524 if (p_child->old.slave2_addr) { 525 /* Maybe this is a SDVO device with multiple inputs */ 526 /* And the mapping info is not added */ 527 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this" 528 " is a SDVO device with multiple inputs.\n"); 529 } 530 count++; 531 } 532 533 if (!count) { 534 /* No SDVO device info is found */ 535 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n"); 536 } 537 return; 538} 539 540static void 541parse_driver_features(struct drm_i915_private *dev_priv, 542 struct bdb_header *bdb) 543{ 544 struct bdb_driver_features *driver; 545 546 driver = find_section(bdb, BDB_DRIVER_FEATURES); 547 if (!driver) 548 return; 549 550 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP) 551 dev_priv->vbt.edp_support = 1; 552 553 if (driver->dual_frequency) 554 dev_priv->render_reclock_avail = true; 555 556 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled); 557 /* 558 * If DRRS is not supported, drrs_type has to be set to 0. 559 * This is because, VBT is configured in such a way that 560 * static DRRS is 0 and DRRS not supported is represented by 561 * driver->drrs_enabled=false 562 */ 563 if (!driver->drrs_enabled) 564 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; 565} 566 567static void 568parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb) 569{ 570 struct bdb_edp *edp; 571 struct edp_power_seq *edp_pps; 572 struct edp_link_params *edp_link_params; 573 574 edp = find_section(bdb, BDB_EDP); 575 if (!edp) { 576 if (dev_priv->vbt.edp_support) 577 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n"); 578 return; 579 } 580 581 switch ((edp->color_depth >> (panel_type * 2)) & 3) { 582 case EDP_18BPP: 583 dev_priv->vbt.edp_bpp = 18; 584 break; 585 case EDP_24BPP: 586 dev_priv->vbt.edp_bpp = 24; 587 break; 588 case EDP_30BPP: 589 dev_priv->vbt.edp_bpp = 30; 590 break; 591 } 592 593 /* Get the eDP sequencing and link info */ 594 edp_pps = &edp->power_seqs[panel_type]; 595 edp_link_params = &edp->link_params[panel_type]; 596 597 dev_priv->vbt.edp_pps = *edp_pps; 598 599 switch (edp_link_params->rate) { 600 case EDP_RATE_1_62: 601 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62; 602 break; 603 case EDP_RATE_2_7: 604 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7; 605 break; 606 default: 607 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n", 608 edp_link_params->rate); 609 break; 610 } 611 612 switch (edp_link_params->lanes) { 613 case EDP_LANE_1: 614 dev_priv->vbt.edp_lanes = 1; 615 break; 616 case EDP_LANE_2: 617 dev_priv->vbt.edp_lanes = 2; 618 break; 619 case EDP_LANE_4: 620 dev_priv->vbt.edp_lanes = 4; 621 break; 622 default: 623 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n", 624 edp_link_params->lanes); 625 break; 626 } 627 628 switch (edp_link_params->preemphasis) { 629 case EDP_PREEMPHASIS_NONE: 630 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0; 631 break; 632 case EDP_PREEMPHASIS_3_5dB: 633 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1; 634 break; 635 case EDP_PREEMPHASIS_6dB: 636 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2; 637 break; 638 case EDP_PREEMPHASIS_9_5dB: 639 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3; 640 break; 641 default: 642 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n", 643 edp_link_params->preemphasis); 644 break; 645 } 646 647 switch (edp_link_params->vswing) { 648 case EDP_VSWING_0_4V: 649 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0; 650 break; 651 case EDP_VSWING_0_6V: 652 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1; 653 break; 654 case EDP_VSWING_0_8V: 655 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2; 656 break; 657 case EDP_VSWING_1_2V: 658 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3; 659 break; 660 default: 661 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n", 662 edp_link_params->vswing); 663 break; 664 } 665} 666 667static u8 *goto_next_sequence(u8 *data, int *size) 668{ 669 u16 len; 670 int tmp = *size; 671 672 if (--tmp < 0) 673 return NULL; 674 675 /* goto first element */ 676 data++; 677 while (1) { 678 switch (*data) { 679 case MIPI_SEQ_ELEM_SEND_PKT: 680 /* 681 * skip by this element payload size 682 * skip elem id, command flag and data type 683 */ 684 tmp -= 5; 685 if (tmp < 0) 686 return NULL; 687 688 data += 3; 689 len = *((u16 *)data); 690 691 tmp -= len; 692 if (tmp < 0) 693 return NULL; 694 695 /* skip by len */ 696 data = data + 2 + len; 697 break; 698 case MIPI_SEQ_ELEM_DELAY: 699 /* skip by elem id, and delay is 4 bytes */ 700 tmp -= 5; 701 if (tmp < 0) 702 return NULL; 703 704 data += 5; 705 break; 706 case MIPI_SEQ_ELEM_GPIO: 707 tmp -= 3; 708 if (tmp < 0) 709 return NULL; 710 711 data += 3; 712 break; 713 default: 714 DRM_ERROR("Unknown element\n"); 715 return NULL; 716 } 717 718 /* end of sequence ? */ 719 if (*data == 0) 720 break; 721 } 722 723 /* goto next sequence or end of block byte */ 724 if (--tmp < 0) 725 return NULL; 726 727 data++; 728 729 /* update amount of data left for the sequence block to be parsed */ 730 *size = tmp; 731 return data; 732} 733 734static void 735parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb) 736{ 737 struct bdb_mipi_config *start; 738 struct bdb_mipi_sequence *sequence; 739 struct mipi_config *config; 740 struct mipi_pps_data *pps; 741 u8 *data, *seq_data; 742 int i, panel_id, seq_size; 743 u16 block_size; 744 745 /* parse MIPI blocks only if LFP type is MIPI */ 746 if (!dev_priv->vbt.has_mipi) 747 return; 748 749 /* Initialize this to undefined indicating no generic MIPI support */ 750 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID; 751 752 /* Block #40 is already parsed and panel_fixed_mode is 753 * stored in dev_priv->lfp_lvds_vbt_mode 754 * resuse this when needed 755 */ 756 757 /* Parse #52 for panel index used from panel_type already 758 * parsed 759 */ 760 start = find_section(bdb, BDB_MIPI_CONFIG); 761 if (!start) { 762 DRM_DEBUG_KMS("No MIPI config BDB found"); 763 return; 764 } 765 766 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n", 767 panel_type); 768 769 /* 770 * get hold of the correct configuration block and pps data as per 771 * the panel_type as index 772 */ 773 config = &start->config[panel_type]; 774 pps = &start->pps[panel_type]; 775 776 /* store as of now full data. Trim when we realise all is not needed */ 777 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL); 778 if (!dev_priv->vbt.dsi.config) 779 return; 780 781 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL); 782 if (!dev_priv->vbt.dsi.pps) { 783 kfree(dev_priv->vbt.dsi.config); 784 return; 785 } 786 787 /* We have mandatory mipi config blocks. Initialize as generic panel */ 788 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID; 789 790 /* Check if we have sequence block as well */ 791 sequence = find_section(bdb, BDB_MIPI_SEQUENCE); 792 if (!sequence) { 793 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n"); 794 return; 795 } 796 797 DRM_DEBUG_DRIVER("Found MIPI sequence block\n"); 798 799 block_size = get_blocksize(sequence); 800 801 /* 802 * parse the sequence block for individual sequences 803 */ 804 dev_priv->vbt.dsi.seq_version = sequence->version; 805 806 seq_data = &sequence->data[0]; 807 808 /* 809 * sequence block is variable length and hence we need to parse and 810 * get the sequence data for specific panel id 811 */ 812 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) { 813 panel_id = *seq_data; 814 seq_size = *((u16 *) (seq_data + 1)); 815 if (panel_id == panel_type) 816 break; 817 818 /* skip the sequence including seq header of 3 bytes */ 819 seq_data = seq_data + 3 + seq_size; 820 if ((seq_data - &sequence->data[0]) > block_size) { 821 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n"); 822 return; 823 } 824 } 825 826 if (i == MAX_MIPI_CONFIGURATIONS) { 827 DRM_ERROR("Sequence block detected but no valid configuration\n"); 828 return; 829 } 830 831 /* check if found sequence is completely within the sequence block 832 * just being paranoid */ 833 if (seq_size > block_size) { 834 DRM_ERROR("Corrupted sequence/size, bailing out\n"); 835 return; 836 } 837 838 /* skip the panel id(1 byte) and seq size(2 bytes) */ 839 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL); 840 if (!dev_priv->vbt.dsi.data) 841 return; 842 843 /* 844 * loop into the sequence data and split into multiple sequneces 845 * There are only 5 types of sequences as of now 846 */ 847 data = dev_priv->vbt.dsi.data; 848 dev_priv->vbt.dsi.size = seq_size; 849 850 /* two consecutive 0x00 indicate end of all sequences */ 851 while (1) { 852 int seq_id = *data; 853 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) { 854 dev_priv->vbt.dsi.sequence[seq_id] = data; 855 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id); 856 } else { 857 DRM_ERROR("undefined sequence\n"); 858 goto err; 859 } 860 861 /* partial parsing to skip elements */ 862 data = goto_next_sequence(data, &seq_size); 863 864 if (data == NULL) { 865 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n"); 866 goto err; 867 } 868 869 if (*data == 0) 870 break; /* end of sequence reached */ 871 } 872 873 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n"); 874 return; 875err: 876 kfree(dev_priv->vbt.dsi.data); 877 dev_priv->vbt.dsi.data = NULL; 878 879 /* error during parsing so set all pointers to null 880 * because of partial parsing */ 881 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence)); 882} 883 884static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, 885 struct bdb_header *bdb) 886{ 887 union child_device_config *it, *child = NULL; 888 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port]; 889 uint8_t hdmi_level_shift; 890 int i, j; 891 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt; 892 uint8_t aux_channel; 893 /* Each DDI port can have more than one value on the "DVO Port" field, 894 * so look for all the possible values for each port and abort if more 895 * than one is found. */ 896 int dvo_ports[][2] = { 897 {DVO_PORT_HDMIA, DVO_PORT_DPA}, 898 {DVO_PORT_HDMIB, DVO_PORT_DPB}, 899 {DVO_PORT_HDMIC, DVO_PORT_DPC}, 900 {DVO_PORT_HDMID, DVO_PORT_DPD}, 901 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ }, 902 }; 903 904 /* Find the child device to use, abort if more than one found. */ 905 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) { 906 it = dev_priv->vbt.child_dev + i; 907 908 for (j = 0; j < 2; j++) { 909 if (dvo_ports[port][j] == -1) 910 break; 911 912 if (it->common.dvo_port == dvo_ports[port][j]) { 913 if (child) { 914 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n", 915 port_name(port)); 916 return; 917 } 918 child = it; 919 } 920 } 921 } 922 if (!child) 923 return; 924 925 aux_channel = child->raw[25]; 926 927 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING; 928 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT; 929 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT; 930 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0; 931 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR); 932 933 info->supports_dvi = is_dvi; 934 info->supports_hdmi = is_hdmi; 935 info->supports_dp = is_dp; 936 937 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n", 938 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt); 939 940 if (is_edp && is_dvi) 941 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n", 942 port_name(port)); 943 if (is_crt && port != PORT_E) 944 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port)); 945 if (is_crt && (is_dvi || is_dp)) 946 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n", 947 port_name(port)); 948 if (is_dvi && (port == PORT_A || port == PORT_E)) 949 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port)); 950 if (!is_dvi && !is_dp && !is_crt) 951 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n", 952 port_name(port)); 953 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E)) 954 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port)); 955 956 if (is_dvi) { 957 if (child->common.ddc_pin == 0x05 && port != PORT_B) 958 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n"); 959 if (child->common.ddc_pin == 0x04 && port != PORT_C) 960 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n"); 961 if (child->common.ddc_pin == 0x06 && port != PORT_D) 962 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n"); 963 } 964 965 if (is_dp) { 966 if (aux_channel == 0x40 && port != PORT_A) 967 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n"); 968 if (aux_channel == 0x10 && port != PORT_B) 969 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n"); 970 if (aux_channel == 0x20 && port != PORT_C) 971 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n"); 972 if (aux_channel == 0x30 && port != PORT_D) 973 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n"); 974 } 975 976 if (bdb->version >= 158) { 977 /* The VBT HDMI level shift values match the table we have. */ 978 hdmi_level_shift = child->raw[7] & 0xF; 979 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n", 980 port_name(port), 981 hdmi_level_shift); 982 info->hdmi_level_shift = hdmi_level_shift; 983 } 984} 985 986static void parse_ddi_ports(struct drm_i915_private *dev_priv, 987 struct bdb_header *bdb) 988{ 989 struct drm_device *dev = dev_priv->dev; 990 enum port port; 991 992 if (!HAS_DDI(dev)) 993 return; 994 995 if (!dev_priv->vbt.child_dev_num) 996 return; 997 998 if (bdb->version < 155) 999 return; 1000 1001 for (port = PORT_A; port < I915_MAX_PORTS; port++) 1002 parse_ddi_port(dev_priv, port, bdb); 1003} 1004 1005static void 1006parse_device_mapping(struct drm_i915_private *dev_priv, 1007 struct bdb_header *bdb) 1008{ 1009 struct bdb_general_definitions *p_defs; 1010 union child_device_config *p_child, *child_dev_ptr; 1011 int i, child_device_num, count; 1012 u16 block_size; 1013 1014 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 1015 if (!p_defs) { 1016 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n"); 1017 return; 1018 } 1019 /* judge whether the size of child device meets the requirements. 1020 * If the child device size obtained from general definition block 1021 * is different with sizeof(struct child_device_config), skip the 1022 * parsing of sdvo device info 1023 */ 1024 if (p_defs->child_dev_size != sizeof(*p_child)) { 1025 /* different child dev size . Ignore it */ 1026 DRM_DEBUG_KMS("different child size is found. Invalid.\n"); 1027 return; 1028 } 1029 /* get the block size of general definitions */ 1030 block_size = get_blocksize(p_defs); 1031 /* get the number of child device */ 1032 child_device_num = (block_size - sizeof(*p_defs)) / 1033 sizeof(*p_child); 1034 count = 0; 1035 /* get the number of child device that is present */ 1036 for (i = 0; i < child_device_num; i++) { 1037 p_child = &(p_defs->devices[i]); 1038 if (!p_child->common.device_type) { 1039 /* skip the device block if device type is invalid */ 1040 continue; 1041 } 1042 count++; 1043 } 1044 if (!count) { 1045 DRM_DEBUG_KMS("no child dev is parsed from VBT\n"); 1046 return; 1047 } 1048 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL); 1049 if (!dev_priv->vbt.child_dev) { 1050 DRM_DEBUG_KMS("No memory space for child device\n"); 1051 return; 1052 } 1053 1054 dev_priv->vbt.child_dev_num = count; 1055 count = 0; 1056 for (i = 0; i < child_device_num; i++) { 1057 p_child = &(p_defs->devices[i]); 1058 if (!p_child->common.device_type) { 1059 /* skip the device block if device type is invalid */ 1060 continue; 1061 } 1062 1063 if (p_child->common.dvo_port >= DVO_PORT_MIPIA 1064 && p_child->common.dvo_port <= DVO_PORT_MIPID 1065 &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) { 1066 DRM_DEBUG_KMS("Found MIPI as LFP\n"); 1067 dev_priv->vbt.has_mipi = 1; 1068 dev_priv->vbt.dsi.port = p_child->common.dvo_port; 1069 } 1070 1071 child_dev_ptr = dev_priv->vbt.child_dev + count; 1072 count++; 1073 memcpy((void *)child_dev_ptr, (void *)p_child, 1074 sizeof(*p_child)); 1075 } 1076 return; 1077} 1078 1079static void 1080init_vbt_defaults(struct drm_i915_private *dev_priv) 1081{ 1082 struct drm_device *dev = dev_priv->dev; 1083 enum port port; 1084 1085 dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC; 1086 1087 /* Default to having backlight */ 1088 dev_priv->vbt.backlight.present = true; 1089 1090 /* LFP panel data */ 1091 dev_priv->vbt.lvds_dither = 1; 1092 dev_priv->vbt.lvds_vbt = 0; 1093 1094 /* SDVO panel data */ 1095 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL; 1096 1097 /* general features */ 1098 dev_priv->vbt.int_tv_support = 1; 1099 dev_priv->vbt.int_crt_support = 1; 1100 1101 /* Default to using SSC */ 1102 dev_priv->vbt.lvds_use_ssc = 1; 1103 /* 1104 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference 1105 * clock for LVDS. 1106 */ 1107 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1108 !HAS_PCH_SPLIT(dev)); 1109 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq); 1110 1111 for (port = PORT_A; port < I915_MAX_PORTS; port++) { 1112 struct ddi_vbt_port_info *info = 1113 &dev_priv->vbt.ddi_port_info[port]; 1114 1115 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN; 1116 1117 info->supports_dvi = (port != PORT_A && port != PORT_E); 1118 info->supports_hdmi = info->supports_dvi; 1119 info->supports_dp = (port != PORT_E); 1120 } 1121} 1122 1123static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id) 1124{ 1125 DRM_DEBUG_KMS("Falling back to manually reading VBT from " 1126 "VBIOS ROM for %s\n", 1127 id->ident); 1128 return 1; 1129} 1130 1131static const struct dmi_system_id intel_no_opregion_vbt[] = { 1132 { 1133 .callback = intel_no_opregion_vbt_callback, 1134 .ident = "ThinkCentre A57", 1135 .matches = { 1136 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1137 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"), 1138 }, 1139 }, 1140 { } 1141}; 1142 1143static struct bdb_header *validate_vbt(char *base, size_t size, 1144 struct vbt_header *vbt, 1145 const char *source) 1146{ 1147 size_t offset; 1148 struct bdb_header *bdb; 1149 1150 if (vbt == NULL) { 1151 DRM_DEBUG_DRIVER("VBT signature missing\n"); 1152 return NULL; 1153 } 1154 1155 offset = (char *)vbt - base; 1156 if (offset + sizeof(struct vbt_header) > size) { 1157 DRM_DEBUG_DRIVER("VBT header incomplete\n"); 1158 return NULL; 1159 } 1160 1161 if (memcmp(vbt->signature, "$VBT", 4)) { 1162 DRM_DEBUG_DRIVER("VBT invalid signature\n"); 1163 return NULL; 1164 } 1165 1166 offset += vbt->bdb_offset; 1167 if (offset + sizeof(struct bdb_header) > size) { 1168 DRM_DEBUG_DRIVER("BDB header incomplete\n"); 1169 return NULL; 1170 } 1171 1172 bdb = (struct bdb_header *)(base + offset); 1173 if (offset + bdb->bdb_size > size) { 1174 DRM_DEBUG_DRIVER("BDB incomplete\n"); 1175 return NULL; 1176 } 1177 1178 DRM_DEBUG_KMS("Using VBT from %s: %20s\n", 1179 source, vbt->signature); 1180 return bdb; 1181} 1182 1183/** 1184 * intel_parse_bios - find VBT and initialize settings from the BIOS 1185 * @dev: DRM device 1186 * 1187 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers 1188 * to appropriate values. 1189 * 1190 * Returns 0 on success, nonzero on failure. 1191 */ 1192int 1193intel_parse_bios(struct drm_device *dev) 1194{ 1195 struct drm_i915_private *dev_priv = dev->dev_private; 1196 struct pci_dev *pdev = dev->pdev; 1197 struct bdb_header *bdb = NULL; 1198 u8 __iomem *bios = NULL; 1199 1200 if (HAS_PCH_NOP(dev)) 1201 return -ENODEV; 1202 1203 init_vbt_defaults(dev_priv); 1204 1205 /* XXX Should this validation be moved to intel_opregion.c? */ 1206 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) 1207 bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE, 1208 (struct vbt_header *)dev_priv->opregion.vbt, 1209 "OpRegion"); 1210 1211 if (bdb == NULL) { 1212 size_t i, size; 1213 1214 bios = pci_map_rom(pdev, &size); 1215 if (!bios) 1216 return -1; 1217 1218 /* Scour memory looking for the VBT signature */ 1219 for (i = 0; i + 4 < size; i++) { 1220 if (memcmp(bios + i, "$VBT", 4) == 0) { 1221 bdb = validate_vbt(bios, size, 1222 (struct vbt_header *)(bios + i), 1223 "PCI ROM"); 1224 break; 1225 } 1226 } 1227 1228 if (!bdb) { 1229 pci_unmap_rom(pdev, bios); 1230 return -1; 1231 } 1232 } 1233 1234 /* Grab useful general definitions */ 1235 parse_general_features(dev_priv, bdb); 1236 parse_general_definitions(dev_priv, bdb); 1237 parse_lfp_panel_data(dev_priv, bdb); 1238 parse_lfp_backlight(dev_priv, bdb); 1239 parse_sdvo_panel_data(dev_priv, bdb); 1240 parse_sdvo_device_mapping(dev_priv, bdb); 1241 parse_device_mapping(dev_priv, bdb); 1242 parse_driver_features(dev_priv, bdb); 1243 parse_edp(dev_priv, bdb); 1244 parse_mipi(dev_priv, bdb); 1245 parse_ddi_ports(dev_priv, bdb); 1246 1247 if (bios) 1248 pci_unmap_rom(pdev, bios); 1249 1250 return 0; 1251} 1252 1253/* Ensure that vital registers have been initialised, even if the BIOS 1254 * is absent or just failing to do its job. 1255 */ 1256void intel_setup_bios(struct drm_device *dev) 1257{ 1258 struct drm_i915_private *dev_priv = dev->dev_private; 1259 1260 /* Set the Panel Power On/Off timings if uninitialized. */ 1261 if (!HAS_PCH_SPLIT(dev) && 1262 I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) { 1263 /* Set T2 to 40ms and T5 to 200ms */ 1264 I915_WRITE(PP_ON_DELAYS, 0x019007d0); 1265 1266 /* Set T3 to 35ms and Tx to 200ms */ 1267 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0); 1268 } 1269} 1270