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/drmP.h> 29 #include <drm/drm_dp_helper.h> 30 #include <drm/i915_drm.h> 31 #include "i915_drv.h" 32 #include "intel_bios.h" 33 #include <linux/string.h> 34 35 #define SLAVE_ADDR1 0x70 36 #define SLAVE_ADDR2 0x72 37 38 static int panel_type; 39 40 static const void * 41 find_section(const void *_bdb, int section_id) 42 { 43 const struct bdb_header *bdb = _bdb; 44 const u8 *base = _bdb; 45 int index = 0; 46 u16 total, current_size; 47 u8 current_id; 48 49 /* skip to first section */ 50 index += bdb->header_size; 51 total = bdb->bdb_size; 52 53 /* walk the sections looking for section_id */ 54 while (index + 3 < total) { 55 current_id = *(base + index); 56 index++; 57 58 current_size = *((const u16 *)(base + index)); 59 index += 2; 60 61 if (index + current_size > total) 62 return NULL; 63 64 if (current_id == section_id) 65 return base + index; 66 67 index += current_size; 68 } 69 70 return NULL; 71 } 72 73 #pragma GCC diagnostic ignored "-Wcast-qual" 74 static u16 75 get_blocksize(const void *p) 76 { 77 u16 *block_ptr, block_size; 78 79 block_ptr = (u16 *)((char *)p - 2); 80 block_size = *block_ptr; 81 return block_size; 82 } 83 #pragma GCC diagnostic pop 84 85 static void 86 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode, 87 const struct lvds_dvo_timing *dvo_timing) 88 { 89 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) | 90 dvo_timing->hactive_lo; 91 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay + 92 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo); 93 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start + 94 dvo_timing->hsync_pulse_width; 95 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay + 96 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo); 97 98 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) | 99 dvo_timing->vactive_lo; 100 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay + 101 dvo_timing->vsync_off; 102 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start + 103 dvo_timing->vsync_pulse_width; 104 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay + 105 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo); 106 panel_fixed_mode->clock = dvo_timing->clock * 10; 107 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED; 108 109 if (dvo_timing->hsync_positive) 110 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC; 111 else 112 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC; 113 114 if (dvo_timing->vsync_positive) 115 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC; 116 else 117 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC; 118 119 /* Some VBTs have bogus h/vtotal values */ 120 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal) 121 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1; 122 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal) 123 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1; 124 125 drm_mode_set_name(panel_fixed_mode); 126 } 127 128 static bool 129 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a, 130 const struct lvds_dvo_timing *b) 131 { 132 if (a->hactive_hi != b->hactive_hi || 133 a->hactive_lo != b->hactive_lo) 134 return false; 135 136 if (a->hsync_off_hi != b->hsync_off_hi || 137 a->hsync_off_lo != b->hsync_off_lo) 138 return false; 139 140 if (a->hsync_pulse_width != b->hsync_pulse_width) 141 return false; 142 143 if (a->hblank_hi != b->hblank_hi || 144 a->hblank_lo != b->hblank_lo) 145 return false; 146 147 if (a->vactive_hi != b->vactive_hi || 148 a->vactive_lo != b->vactive_lo) 149 return false; 150 151 if (a->vsync_off != b->vsync_off) 152 return false; 153 154 if (a->vsync_pulse_width != b->vsync_pulse_width) 155 return false; 156 157 if (a->vblank_hi != b->vblank_hi || 158 a->vblank_lo != b->vblank_lo) 159 return false; 160 161 return true; 162 } 163 164 static const struct lvds_dvo_timing * 165 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data, 166 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs, 167 int index) 168 { 169 /* 170 * the size of fp_timing varies on the different platform. 171 * So calculate the DVO timing relative offset in LVDS data 172 * entry to get the DVO timing entry 173 */ 174 175 int lfp_data_size = 176 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset - 177 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset; 178 int dvo_timing_offset = 179 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset - 180 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset; 181 const char *entry = (const char *)lvds_lfp_data->data + lfp_data_size * index; 182 183 return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset); 184 } 185 186 /* get lvds_fp_timing entry 187 * this function may return NULL if the corresponding entry is invalid 188 */ 189 static const struct lvds_fp_timing * 190 get_lvds_fp_timing(const struct bdb_header *bdb, 191 const struct bdb_lvds_lfp_data *data, 192 const struct bdb_lvds_lfp_data_ptrs *ptrs, 193 int index) 194 { 195 size_t data_ofs = (const u8 *)data - (const u8 *)bdb; 196 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */ 197 size_t ofs; 198 199 if (index >= ARRAY_SIZE(ptrs->ptr)) 200 return NULL; 201 ofs = ptrs->ptr[index].fp_timing_offset; 202 if (ofs < data_ofs || 203 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size) 204 return NULL; 205 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs); 206 } 207 208 /* Try to find integrated panel data */ 209 static void 210 parse_lfp_panel_data(struct drm_i915_private *dev_priv, 211 const struct bdb_header *bdb) 212 { 213 const struct bdb_lvds_options *lvds_options; 214 const struct bdb_lvds_lfp_data *lvds_lfp_data; 215 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs; 216 const struct lvds_dvo_timing *panel_dvo_timing; 217 const struct lvds_fp_timing *fp_timing; 218 struct drm_display_mode *panel_fixed_mode; 219 int i, downclock, drrs_mode; 220 221 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS); 222 if (!lvds_options) 223 return; 224 225 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither; 226 if (lvds_options->panel_type == 0xff) 227 return; 228 229 panel_type = lvds_options->panel_type; 230 231 drrs_mode = (lvds_options->dps_panel_type_bits 232 >> (panel_type * 2)) & MODE_MASK; 233 /* 234 * VBT has static DRRS = 0 and seamless DRRS = 2. 235 * The below piece of code is required to adjust vbt.drrs_type 236 * to match the enum drrs_support_type. 237 */ 238 switch (drrs_mode) { 239 case 0: 240 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT; 241 DRM_DEBUG_KMS("DRRS supported mode is static\n"); 242 break; 243 case 2: 244 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT; 245 DRM_DEBUG_KMS("DRRS supported mode is seamless\n"); 246 break; 247 default: 248 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; 249 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n"); 250 break; 251 } 252 253 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA); 254 if (!lvds_lfp_data) 255 return; 256 257 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS); 258 if (!lvds_lfp_data_ptrs) 259 return; 260 261 dev_priv->vbt.lvds_vbt = 1; 262 263 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data, 264 lvds_lfp_data_ptrs, 265 lvds_options->panel_type); 266 267 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 268 if (!panel_fixed_mode) 269 return; 270 271 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing); 272 273 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode; 274 275 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n"); 276 drm_mode_debug_printmodeline(panel_fixed_mode); 277 278 /* 279 * Iterate over the LVDS panel timing info to find the lowest clock 280 * for the native resolution. 281 */ 282 downclock = panel_dvo_timing->clock; 283 for (i = 0; i < 16; i++) { 284 const struct lvds_dvo_timing *dvo_timing; 285 286 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data, 287 lvds_lfp_data_ptrs, 288 i); 289 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) && 290 dvo_timing->clock < downclock) 291 downclock = dvo_timing->clock; 292 } 293 294 if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) { 295 dev_priv->lvds_downclock_avail = 1; 296 dev_priv->lvds_downclock = downclock * 10; 297 DRM_DEBUG_KMS("LVDS downclock is found in VBT. " 298 "Normal Clock %dKHz, downclock %dKHz\n", 299 panel_fixed_mode->clock, 10*downclock); 300 } 301 302 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data, 303 lvds_lfp_data_ptrs, 304 lvds_options->panel_type); 305 if (fp_timing) { 306 /* check the resolution, just to be sure */ 307 if (fp_timing->x_res == panel_fixed_mode->hdisplay && 308 fp_timing->y_res == panel_fixed_mode->vdisplay) { 309 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val; 310 DRM_DEBUG_KMS("VBT initial LVDS value %x\n", 311 dev_priv->vbt.bios_lvds_val); 312 } 313 } 314 } 315 316 static void 317 parse_lfp_backlight(struct drm_i915_private *dev_priv, 318 const struct bdb_header *bdb) 319 { 320 const struct bdb_lfp_backlight_data *backlight_data; 321 const struct bdb_lfp_backlight_data_entry *entry; 322 323 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT); 324 if (!backlight_data) 325 return; 326 327 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) { 328 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n", 329 backlight_data->entry_size); 330 return; 331 } 332 333 entry = &backlight_data->data[panel_type]; 334 335 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM; 336 if (!dev_priv->vbt.backlight.present) { 337 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n", 338 entry->type); 339 return; 340 } 341 342 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz; 343 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm; 344 dev_priv->vbt.backlight.min_brightness = entry->min_brightness; 345 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, " 346 "active %s, min brightness %u, level %u\n", 347 dev_priv->vbt.backlight.pwm_freq_hz, 348 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high", 349 dev_priv->vbt.backlight.min_brightness, 350 backlight_data->level[panel_type]); 351 } 352 353 /* Try to find sdvo panel data */ 354 static void 355 parse_sdvo_panel_data(struct drm_i915_private *dev_priv, 356 const struct bdb_header *bdb) 357 { 358 const struct lvds_dvo_timing *dvo_timing; 359 struct drm_display_mode *panel_fixed_mode; 360 int index; 361 362 index = i915.vbt_sdvo_panel_type; 363 if (index == -2) { 364 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n"); 365 return; 366 } 367 368 if (index == -1) { 369 const struct bdb_sdvo_lvds_options *sdvo_lvds_options; 370 371 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS); 372 if (!sdvo_lvds_options) 373 return; 374 375 index = sdvo_lvds_options->panel_type; 376 } 377 378 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS); 379 if (!dvo_timing) 380 return; 381 382 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 383 if (!panel_fixed_mode) 384 return; 385 386 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index); 387 388 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode; 389 390 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n"); 391 drm_mode_debug_printmodeline(panel_fixed_mode); 392 } 393 394 static int intel_bios_ssc_frequency(struct drm_device *dev, 395 bool alternate) 396 { 397 switch (INTEL_INFO(dev)->gen) { 398 case 2: 399 return alternate ? 66667 : 48000; 400 case 3: 401 case 4: 402 return alternate ? 100000 : 96000; 403 default: 404 return alternate ? 100000 : 120000; 405 } 406 } 407 408 static void 409 parse_general_features(struct drm_i915_private *dev_priv, 410 const struct bdb_header *bdb) 411 { 412 struct drm_device *dev = dev_priv->dev; 413 const struct bdb_general_features *general; 414 415 general = find_section(bdb, BDB_GENERAL_FEATURES); 416 if (general) { 417 dev_priv->vbt.int_tv_support = general->int_tv_support; 418 dev_priv->vbt.int_crt_support = general->int_crt_support; 419 dev_priv->vbt.lvds_use_ssc = general->enable_ssc; 420 dev_priv->vbt.lvds_ssc_freq = 421 intel_bios_ssc_frequency(dev, general->ssc_freq); 422 dev_priv->vbt.display_clock_mode = general->display_clock_mode; 423 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted; 424 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", 425 dev_priv->vbt.int_tv_support, 426 dev_priv->vbt.int_crt_support, 427 dev_priv->vbt.lvds_use_ssc, 428 dev_priv->vbt.lvds_ssc_freq, 429 dev_priv->vbt.display_clock_mode, 430 dev_priv->vbt.fdi_rx_polarity_inverted); 431 } 432 } 433 434 static void 435 parse_general_definitions(struct drm_i915_private *dev_priv, 436 const struct bdb_header *bdb) 437 { 438 const struct bdb_general_definitions *general; 439 440 general = find_section(bdb, BDB_GENERAL_DEFINITIONS); 441 if (general) { 442 u16 block_size = get_blocksize(general); 443 if (block_size >= sizeof(*general)) { 444 int bus_pin = general->crt_ddc_gmbus_pin; 445 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin); 446 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin)) 447 dev_priv->vbt.crt_ddc_pin = bus_pin; 448 } else { 449 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n", 450 block_size); 451 } 452 } 453 } 454 455 static const union child_device_config * 456 child_device_ptr(const struct bdb_general_definitions *p_defs, int i) 457 { 458 return (const void *) &p_defs->devices[i * p_defs->child_dev_size]; 459 } 460 461 static void 462 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, 463 const struct bdb_header *bdb) 464 { 465 struct sdvo_device_mapping *p_mapping; 466 const struct bdb_general_definitions *p_defs; 467 const union child_device_config *p_child; 468 int i, child_device_num, count; 469 u16 block_size; 470 471 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 472 if (!p_defs) { 473 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n"); 474 return; 475 } 476 /* judge whether the size of child device meets the requirements. 477 * If the child device size obtained from general definition block 478 * is different with sizeof(struct child_device_config), skip the 479 * parsing of sdvo device info 480 */ 481 if (p_defs->child_dev_size != sizeof(*p_child)) { 482 /* different child dev size . Ignore it */ 483 DRM_DEBUG_KMS("different child size is found. Invalid.\n"); 484 return; 485 } 486 /* get the block size of general definitions */ 487 block_size = get_blocksize(p_defs); 488 /* get the number of child device */ 489 child_device_num = (block_size - sizeof(*p_defs)) / 490 p_defs->child_dev_size; 491 count = 0; 492 for (i = 0; i < child_device_num; i++) { 493 p_child = child_device_ptr(p_defs, i); 494 if (!p_child->old.device_type) { 495 /* skip the device block if device type is invalid */ 496 continue; 497 } 498 if (p_child->old.slave_addr != SLAVE_ADDR1 && 499 p_child->old.slave_addr != SLAVE_ADDR2) { 500 /* 501 * If the slave address is neither 0x70 nor 0x72, 502 * it is not a SDVO device. Skip it. 503 */ 504 continue; 505 } 506 if (p_child->old.dvo_port != DEVICE_PORT_DVOB && 507 p_child->old.dvo_port != DEVICE_PORT_DVOC) { 508 /* skip the incorrect SDVO port */ 509 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n"); 510 continue; 511 } 512 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on" 513 " %s port\n", 514 p_child->old.slave_addr, 515 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ? 516 "SDVOB" : "SDVOC"); 517 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]); 518 if (!p_mapping->initialized) { 519 p_mapping->dvo_port = p_child->old.dvo_port; 520 p_mapping->slave_addr = p_child->old.slave_addr; 521 p_mapping->dvo_wiring = p_child->old.dvo_wiring; 522 p_mapping->ddc_pin = p_child->old.ddc_pin; 523 p_mapping->i2c_pin = p_child->old.i2c_pin; 524 p_mapping->initialized = 1; 525 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n", 526 p_mapping->dvo_port, 527 p_mapping->slave_addr, 528 p_mapping->dvo_wiring, 529 p_mapping->ddc_pin, 530 p_mapping->i2c_pin); 531 } else { 532 DRM_DEBUG_KMS("Maybe one SDVO port is shared by " 533 "two SDVO device.\n"); 534 } 535 if (p_child->old.slave2_addr) { 536 /* Maybe this is a SDVO device with multiple inputs */ 537 /* And the mapping info is not added */ 538 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this" 539 " is a SDVO device with multiple inputs.\n"); 540 } 541 count++; 542 } 543 544 if (!count) { 545 /* No SDVO device info is found */ 546 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n"); 547 } 548 return; 549 } 550 551 static void 552 parse_driver_features(struct drm_i915_private *dev_priv, 553 const struct bdb_header *bdb) 554 { 555 const struct bdb_driver_features *driver; 556 557 driver = find_section(bdb, BDB_DRIVER_FEATURES); 558 if (!driver) 559 return; 560 561 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP) 562 dev_priv->vbt.edp_support = 1; 563 564 if (driver->dual_frequency) 565 dev_priv->render_reclock_avail = true; 566 567 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled); 568 /* 569 * If DRRS is not supported, drrs_type has to be set to 0. 570 * This is because, VBT is configured in such a way that 571 * static DRRS is 0 and DRRS not supported is represented by 572 * driver->drrs_enabled=false 573 */ 574 if (!driver->drrs_enabled) 575 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; 576 } 577 578 static void 579 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) 580 { 581 const struct bdb_edp *edp; 582 const struct edp_power_seq *edp_pps; 583 const struct edp_link_params *edp_link_params; 584 585 edp = find_section(bdb, BDB_EDP); 586 if (!edp) { 587 if (dev_priv->vbt.edp_support) 588 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n"); 589 return; 590 } 591 592 switch ((edp->color_depth >> (panel_type * 2)) & 3) { 593 case EDP_18BPP: 594 dev_priv->vbt.edp_bpp = 18; 595 break; 596 case EDP_24BPP: 597 dev_priv->vbt.edp_bpp = 24; 598 break; 599 case EDP_30BPP: 600 dev_priv->vbt.edp_bpp = 30; 601 break; 602 } 603 604 /* Get the eDP sequencing and link info */ 605 edp_pps = &edp->power_seqs[panel_type]; 606 edp_link_params = &edp->link_params[panel_type]; 607 608 dev_priv->vbt.edp_pps = *edp_pps; 609 610 switch (edp_link_params->rate) { 611 case EDP_RATE_1_62: 612 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62; 613 break; 614 case EDP_RATE_2_7: 615 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7; 616 break; 617 default: 618 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n", 619 edp_link_params->rate); 620 break; 621 } 622 623 switch (edp_link_params->lanes) { 624 case EDP_LANE_1: 625 dev_priv->vbt.edp_lanes = 1; 626 break; 627 case EDP_LANE_2: 628 dev_priv->vbt.edp_lanes = 2; 629 break; 630 case EDP_LANE_4: 631 dev_priv->vbt.edp_lanes = 4; 632 break; 633 default: 634 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n", 635 edp_link_params->lanes); 636 break; 637 } 638 639 switch (edp_link_params->preemphasis) { 640 case EDP_PREEMPHASIS_NONE: 641 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0; 642 break; 643 case EDP_PREEMPHASIS_3_5dB: 644 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1; 645 break; 646 case EDP_PREEMPHASIS_6dB: 647 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2; 648 break; 649 case EDP_PREEMPHASIS_9_5dB: 650 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3; 651 break; 652 default: 653 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n", 654 edp_link_params->preemphasis); 655 break; 656 } 657 658 switch (edp_link_params->vswing) { 659 case EDP_VSWING_0_4V: 660 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0; 661 break; 662 case EDP_VSWING_0_6V: 663 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1; 664 break; 665 case EDP_VSWING_0_8V: 666 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2; 667 break; 668 case EDP_VSWING_1_2V: 669 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3; 670 break; 671 default: 672 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n", 673 edp_link_params->vswing); 674 break; 675 } 676 677 if (bdb->version >= 173) { 678 uint8_t vswing; 679 680 /* Don't read from VBT if module parameter has valid value*/ 681 if (i915.edp_vswing) { 682 dev_priv->edp_low_vswing = i915.edp_vswing == 1; 683 } else { 684 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF; 685 dev_priv->edp_low_vswing = vswing == 0; 686 } 687 } 688 } 689 690 static void 691 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) 692 { 693 const struct bdb_psr *psr; 694 const struct psr_table *psr_table; 695 696 psr = find_section(bdb, BDB_PSR); 697 if (!psr) { 698 DRM_DEBUG_KMS("No PSR BDB found.\n"); 699 return; 700 } 701 702 psr_table = &psr->psr_table[panel_type]; 703 704 dev_priv->vbt.psr.full_link = psr_table->full_link; 705 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup; 706 707 /* Allowed VBT values goes from 0 to 15 */ 708 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 : 709 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames; 710 711 switch (psr_table->lines_to_wait) { 712 case 0: 713 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT; 714 break; 715 case 1: 716 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT; 717 break; 718 case 2: 719 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT; 720 break; 721 case 3: 722 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT; 723 break; 724 default: 725 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n", 726 psr_table->lines_to_wait); 727 break; 728 } 729 730 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time; 731 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time; 732 } 733 734 static u8 *goto_next_sequence(u8 *data, int *size) 735 { 736 u16 len; 737 int tmp = *size; 738 739 if (--tmp < 0) 740 return NULL; 741 742 /* goto first element */ 743 data++; 744 while (1) { 745 switch (*data) { 746 case MIPI_SEQ_ELEM_SEND_PKT: 747 /* 748 * skip by this element payload size 749 * skip elem id, command flag and data type 750 */ 751 tmp -= 5; 752 if (tmp < 0) 753 return NULL; 754 755 data += 3; 756 len = *((u16 *)data); 757 758 tmp -= len; 759 if (tmp < 0) 760 return NULL; 761 762 /* skip by len */ 763 data = data + 2 + len; 764 break; 765 case MIPI_SEQ_ELEM_DELAY: 766 /* skip by elem id, and delay is 4 bytes */ 767 tmp -= 5; 768 if (tmp < 0) 769 return NULL; 770 771 data += 5; 772 break; 773 case MIPI_SEQ_ELEM_GPIO: 774 tmp -= 3; 775 if (tmp < 0) 776 return NULL; 777 778 data += 3; 779 break; 780 default: 781 DRM_ERROR("Unknown element\n"); 782 return NULL; 783 } 784 785 /* end of sequence ? */ 786 if (*data == 0) 787 break; 788 } 789 790 /* goto next sequence or end of block byte */ 791 if (--tmp < 0) 792 return NULL; 793 794 data++; 795 796 /* update amount of data left for the sequence block to be parsed */ 797 *size = tmp; 798 return data; 799 } 800 801 static void 802 parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) 803 { 804 const struct bdb_mipi_config *start; 805 const struct bdb_mipi_sequence *sequence; 806 const struct mipi_config *config; 807 const struct mipi_pps_data *pps; 808 u8 *data; 809 const u8 *seq_data; 810 int i, panel_id, seq_size; 811 u16 block_size; 812 813 /* parse MIPI blocks only if LFP type is MIPI */ 814 if (!dev_priv->vbt.has_mipi) 815 return; 816 817 /* Initialize this to undefined indicating no generic MIPI support */ 818 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID; 819 820 /* Block #40 is already parsed and panel_fixed_mode is 821 * stored in dev_priv->lfp_lvds_vbt_mode 822 * resuse this when needed 823 */ 824 825 /* Parse #52 for panel index used from panel_type already 826 * parsed 827 */ 828 start = find_section(bdb, BDB_MIPI_CONFIG); 829 if (!start) { 830 DRM_DEBUG_KMS("No MIPI config BDB found"); 831 return; 832 } 833 834 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n", 835 panel_type); 836 837 /* 838 * get hold of the correct configuration block and pps data as per 839 * the panel_type as index 840 */ 841 config = &start->config[panel_type]; 842 pps = &start->pps[panel_type]; 843 844 /* store as of now full data. Trim when we realise all is not needed */ 845 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL); 846 if (!dev_priv->vbt.dsi.config) 847 return; 848 849 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL); 850 if (!dev_priv->vbt.dsi.pps) { 851 kfree(dev_priv->vbt.dsi.config); 852 return; 853 } 854 855 /* We have mandatory mipi config blocks. Initialize as generic panel */ 856 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID; 857 858 /* Check if we have sequence block as well */ 859 sequence = find_section(bdb, BDB_MIPI_SEQUENCE); 860 if (!sequence) { 861 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n"); 862 return; 863 } 864 865 DRM_DEBUG_DRIVER("Found MIPI sequence block\n"); 866 867 block_size = get_blocksize(sequence); 868 869 /* 870 * parse the sequence block for individual sequences 871 */ 872 dev_priv->vbt.dsi.seq_version = sequence->version; 873 874 seq_data = &sequence->data[0]; 875 876 /* 877 * sequence block is variable length and hence we need to parse and 878 * get the sequence data for specific panel id 879 */ 880 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) { 881 panel_id = *seq_data; 882 #pragma GCC diagnostic ignored "-Wcast-qual" 883 seq_size = *((u16 *) (seq_data + 1)); 884 #pragma GCC diagnostic pop 885 if (panel_id == panel_type) 886 break; 887 888 /* skip the sequence including seq header of 3 bytes */ 889 seq_data = seq_data + 3 + seq_size; 890 if ((seq_data - &sequence->data[0]) > block_size) { 891 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n"); 892 return; 893 } 894 } 895 896 if (i == MAX_MIPI_CONFIGURATIONS) { 897 DRM_ERROR("Sequence block detected but no valid configuration\n"); 898 return; 899 } 900 901 /* check if found sequence is completely within the sequence block 902 * just being paranoid */ 903 if (seq_size > block_size) { 904 DRM_ERROR("Corrupted sequence/size, bailing out\n"); 905 return; 906 } 907 908 /* skip the panel id(1 byte) and seq size(2 bytes) */ 909 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL); 910 if (!dev_priv->vbt.dsi.data) 911 return; 912 913 /* 914 * loop into the sequence data and split into multiple sequneces 915 * There are only 5 types of sequences as of now 916 */ 917 data = dev_priv->vbt.dsi.data; 918 dev_priv->vbt.dsi.size = seq_size; 919 920 /* two consecutive 0x00 indicate end of all sequences */ 921 while (1) { 922 int seq_id = *data; 923 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) { 924 dev_priv->vbt.dsi.sequence[seq_id] = data; 925 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id); 926 } else { 927 DRM_ERROR("undefined sequence\n"); 928 goto err; 929 } 930 931 /* partial parsing to skip elements */ 932 data = goto_next_sequence(data, &seq_size); 933 934 if (data == NULL) { 935 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n"); 936 goto err; 937 } 938 939 if (*data == 0) 940 break; /* end of sequence reached */ 941 } 942 943 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n"); 944 return; 945 err: 946 kfree(dev_priv->vbt.dsi.data); 947 dev_priv->vbt.dsi.data = NULL; 948 949 /* error during parsing so set all pointers to null 950 * because of partial parsing */ 951 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence)); 952 } 953 954 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, 955 const struct bdb_header *bdb) 956 { 957 union child_device_config *it, *child = NULL; 958 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port]; 959 uint8_t hdmi_level_shift; 960 int i, j; 961 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt; 962 uint8_t aux_channel; 963 /* Each DDI port can have more than one value on the "DVO Port" field, 964 * so look for all the possible values for each port and abort if more 965 * than one is found. */ 966 int dvo_ports[][2] = { 967 {DVO_PORT_HDMIA, DVO_PORT_DPA}, 968 {DVO_PORT_HDMIB, DVO_PORT_DPB}, 969 {DVO_PORT_HDMIC, DVO_PORT_DPC}, 970 {DVO_PORT_HDMID, DVO_PORT_DPD}, 971 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ }, 972 }; 973 974 /* Find the child device to use, abort if more than one found. */ 975 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) { 976 it = dev_priv->vbt.child_dev + i; 977 978 for (j = 0; j < 2; j++) { 979 if (dvo_ports[port][j] == -1) 980 break; 981 982 if (it->common.dvo_port == dvo_ports[port][j]) { 983 if (child) { 984 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n", 985 port_name(port)); 986 return; 987 } 988 child = it; 989 } 990 } 991 } 992 if (!child) 993 return; 994 995 aux_channel = child->raw[25]; 996 997 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING; 998 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT; 999 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT; 1000 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0; 1001 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR); 1002 1003 info->supports_dvi = is_dvi; 1004 info->supports_hdmi = is_hdmi; 1005 info->supports_dp = is_dp; 1006 1007 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n", 1008 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt); 1009 1010 if (is_edp && is_dvi) 1011 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n", 1012 port_name(port)); 1013 if (is_crt && port != PORT_E) 1014 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port)); 1015 if (is_crt && (is_dvi || is_dp)) 1016 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n", 1017 port_name(port)); 1018 if (is_dvi && (port == PORT_A || port == PORT_E)) 1019 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port)); 1020 if (!is_dvi && !is_dp && !is_crt) 1021 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n", 1022 port_name(port)); 1023 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E)) 1024 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port)); 1025 1026 if (is_dvi) { 1027 if (child->common.ddc_pin == 0x05 && port != PORT_B) 1028 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n"); 1029 if (child->common.ddc_pin == 0x04 && port != PORT_C) 1030 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n"); 1031 if (child->common.ddc_pin == 0x06 && port != PORT_D) 1032 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n"); 1033 } 1034 1035 if (is_dp) { 1036 if (aux_channel == 0x40 && port != PORT_A) 1037 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n"); 1038 if (aux_channel == 0x10 && port != PORT_B) 1039 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n"); 1040 if (aux_channel == 0x20 && port != PORT_C) 1041 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n"); 1042 if (aux_channel == 0x30 && port != PORT_D) 1043 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n"); 1044 } 1045 1046 if (bdb->version >= 158) { 1047 /* The VBT HDMI level shift values match the table we have. */ 1048 hdmi_level_shift = child->raw[7] & 0xF; 1049 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n", 1050 port_name(port), 1051 hdmi_level_shift); 1052 info->hdmi_level_shift = hdmi_level_shift; 1053 } 1054 } 1055 1056 static void parse_ddi_ports(struct drm_i915_private *dev_priv, 1057 const struct bdb_header *bdb) 1058 { 1059 struct drm_device *dev = dev_priv->dev; 1060 enum port port; 1061 1062 if (!HAS_DDI(dev)) 1063 return; 1064 1065 if (!dev_priv->vbt.child_dev_num) 1066 return; 1067 1068 if (bdb->version < 155) 1069 return; 1070 1071 for (port = PORT_A; port < I915_MAX_PORTS; port++) 1072 parse_ddi_port(dev_priv, port, bdb); 1073 } 1074 1075 static void 1076 parse_device_mapping(struct drm_i915_private *dev_priv, 1077 const struct bdb_header *bdb) 1078 { 1079 const struct bdb_general_definitions *p_defs; 1080 const union child_device_config *p_child; 1081 union child_device_config *child_dev_ptr; 1082 int i, child_device_num, count; 1083 u16 block_size; 1084 1085 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 1086 if (!p_defs) { 1087 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n"); 1088 return; 1089 } 1090 if (p_defs->child_dev_size < sizeof(*p_child)) { 1091 DRM_ERROR("General definiton block child device size is too small.\n"); 1092 return; 1093 } 1094 /* get the block size of general definitions */ 1095 block_size = get_blocksize(p_defs); 1096 /* get the number of child device */ 1097 child_device_num = (block_size - sizeof(*p_defs)) / 1098 p_defs->child_dev_size; 1099 count = 0; 1100 /* get the number of child device that is present */ 1101 for (i = 0; i < child_device_num; i++) { 1102 p_child = child_device_ptr(p_defs, i); 1103 if (!p_child->common.device_type) { 1104 /* skip the device block if device type is invalid */ 1105 continue; 1106 } 1107 count++; 1108 } 1109 if (!count) { 1110 DRM_DEBUG_KMS("no child dev is parsed from VBT\n"); 1111 return; 1112 } 1113 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL); 1114 if (!dev_priv->vbt.child_dev) { 1115 DRM_DEBUG_KMS("No memory space for child device\n"); 1116 return; 1117 } 1118 1119 dev_priv->vbt.child_dev_num = count; 1120 count = 0; 1121 for (i = 0; i < child_device_num; i++) { 1122 p_child = child_device_ptr(p_defs, i); 1123 if (!p_child->common.device_type) { 1124 /* skip the device block if device type is invalid */ 1125 continue; 1126 } 1127 1128 if (p_child->common.dvo_port >= DVO_PORT_MIPIA 1129 && p_child->common.dvo_port <= DVO_PORT_MIPID 1130 &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) { 1131 DRM_DEBUG_KMS("Found MIPI as LFP\n"); 1132 dev_priv->vbt.has_mipi = 1; 1133 dev_priv->vbt.dsi.port = p_child->common.dvo_port; 1134 } 1135 1136 child_dev_ptr = dev_priv->vbt.child_dev + count; 1137 count++; 1138 memcpy(child_dev_ptr, p_child, sizeof(*p_child)); 1139 } 1140 return; 1141 } 1142 1143 static void 1144 init_vbt_defaults(struct drm_i915_private *dev_priv) 1145 { 1146 struct drm_device *dev = dev_priv->dev; 1147 enum port port; 1148 1149 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC; 1150 1151 /* Default to having backlight */ 1152 dev_priv->vbt.backlight.present = true; 1153 1154 /* LFP panel data */ 1155 dev_priv->vbt.lvds_dither = 1; 1156 dev_priv->vbt.lvds_vbt = 0; 1157 1158 /* SDVO panel data */ 1159 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL; 1160 1161 /* general features */ 1162 dev_priv->vbt.int_tv_support = 1; 1163 dev_priv->vbt.int_crt_support = 1; 1164 1165 /* Default to using SSC */ 1166 dev_priv->vbt.lvds_use_ssc = 1; 1167 /* 1168 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference 1169 * clock for LVDS. 1170 */ 1171 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1172 !HAS_PCH_SPLIT(dev)); 1173 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq); 1174 1175 for (port = PORT_A; port < I915_MAX_PORTS; port++) { 1176 struct ddi_vbt_port_info *info = 1177 &dev_priv->vbt.ddi_port_info[port]; 1178 1179 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN; 1180 1181 info->supports_dvi = (port != PORT_A && port != PORT_E); 1182 info->supports_hdmi = info->supports_dvi; 1183 info->supports_dp = (port != PORT_E); 1184 } 1185 } 1186 1187 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id) 1188 { 1189 DRM_DEBUG_KMS("Falling back to manually reading VBT from " 1190 "VBIOS ROM for %s\n", 1191 id->ident); 1192 return 1; 1193 } 1194 1195 static const struct dmi_system_id intel_no_opregion_vbt[] = { 1196 { 1197 .callback = intel_no_opregion_vbt_callback, 1198 .ident = "ThinkCentre A57", 1199 .matches = { 1200 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1201 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"), 1202 }, 1203 }, 1204 { } 1205 }; 1206 1207 static const struct bdb_header *validate_vbt(const void __iomem *_base, 1208 size_t size, 1209 const void __iomem *_vbt, 1210 const char *source) 1211 { 1212 /* 1213 * This is the one place where we explicitly discard the address space 1214 * (__iomem) of the BIOS/VBT. (And this will cause a sparse complaint.) 1215 * From now on everything is based on 'base', and treated as regular 1216 * memory. 1217 */ 1218 const char *base = (const void *) _base; 1219 size_t offset = (const char *)_vbt - (const char*)_base; 1220 const struct vbt_header *vbt = (const struct vbt_header *)(base + offset); 1221 const struct bdb_header *bdb; 1222 1223 if (offset + sizeof(struct vbt_header) > size) { 1224 DRM_DEBUG_DRIVER("VBT header incomplete\n"); 1225 return NULL; 1226 } 1227 1228 if (memcmp(vbt->signature, "$VBT", 4)) { 1229 DRM_DEBUG_DRIVER("VBT invalid signature\n"); 1230 return NULL; 1231 } 1232 1233 offset += vbt->bdb_offset; 1234 if (offset + sizeof(struct bdb_header) > size) { 1235 DRM_DEBUG_DRIVER("BDB header incomplete\n"); 1236 return NULL; 1237 } 1238 1239 bdb = (const struct bdb_header*)(base + offset); 1240 if (offset + bdb->bdb_size > size) { 1241 DRM_DEBUG_DRIVER("BDB incomplete\n"); 1242 return NULL; 1243 } 1244 1245 DRM_DEBUG_KMS("Using VBT from %s: %20s\n", 1246 source, vbt->signature); 1247 return bdb; 1248 } 1249 1250 static const struct bdb_header *find_vbt(void __iomem *bios, size_t size) 1251 { 1252 const struct bdb_header *bdb = NULL; 1253 size_t i; 1254 1255 /* Scour memory looking for the VBT signature. */ 1256 for (i = 0; i + 4 < size; i++) { 1257 if (ioread32(bios + i) == *((const u32 *) "$VBT")) { 1258 bdb = validate_vbt((char *)bios, size, (char *)bios + i, "PCI ROM"); 1259 break; 1260 } 1261 } 1262 1263 return bdb; 1264 } 1265 1266 /** 1267 * intel_parse_bios - find VBT and initialize settings from the BIOS 1268 * @dev: DRM device 1269 * 1270 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers 1271 * to appropriate values. 1272 * 1273 * Returns 0 on success, nonzero on failure. 1274 */ 1275 int 1276 intel_parse_bios(struct drm_device *dev) 1277 { 1278 struct drm_i915_private *dev_priv = dev->dev_private; 1279 #if 0 1280 struct pci_dev *pdev = dev->pdev; 1281 #endif 1282 const struct bdb_header *bdb = NULL; 1283 u8 __iomem *bios = NULL; 1284 1285 if (HAS_PCH_NOP(dev)) 1286 return -ENODEV; 1287 1288 init_vbt_defaults(dev_priv); 1289 1290 /* XXX Should this validation be moved to intel_opregion.c? */ 1291 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) 1292 bdb = validate_vbt(dev_priv->opregion.header, OPREGION_SIZE, 1293 dev_priv->opregion.vbt, "OpRegion"); 1294 1295 if (bdb == NULL) { 1296 size_t size; 1297 1298 #if 0 1299 bios = pci_map_rom(pdev, &size); 1300 if (!bios) 1301 #endif 1302 return -1; 1303 1304 bdb = find_vbt(bios, size); 1305 if (!bdb) { 1306 #if 0 1307 pci_unmap_rom(pdev, bios); 1308 #endif 1309 return -1; 1310 } 1311 } 1312 1313 /* Grab useful general definitions */ 1314 parse_general_features(dev_priv, bdb); 1315 parse_general_definitions(dev_priv, bdb); 1316 parse_lfp_panel_data(dev_priv, bdb); 1317 parse_lfp_backlight(dev_priv, bdb); 1318 parse_sdvo_panel_data(dev_priv, bdb); 1319 parse_sdvo_device_mapping(dev_priv, bdb); 1320 parse_device_mapping(dev_priv, bdb); 1321 parse_driver_features(dev_priv, bdb); 1322 parse_edp(dev_priv, bdb); 1323 parse_psr(dev_priv, bdb); 1324 parse_mipi(dev_priv, bdb); 1325 parse_ddi_ports(dev_priv, bdb); 1326 1327 #if 0 1328 if (bios) 1329 pci_unmap_rom(pdev, bios); 1330 #endif 1331 1332 return 0; 1333 } 1334 1335 /* Ensure that vital registers have been initialised, even if the BIOS 1336 * is absent or just failing to do its job. 1337 */ 1338 void intel_setup_bios(struct drm_device *dev) 1339 { 1340 struct drm_i915_private *dev_priv = dev->dev_private; 1341 1342 /* Set the Panel Power On/Off timings if uninitialized. */ 1343 if (!HAS_PCH_SPLIT(dev) && 1344 I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) { 1345 /* Set T2 to 40ms and T5 to 200ms */ 1346 I915_WRITE(PP_ON_DELAYS, 0x019007d0); 1347 1348 /* Set T3 to 35ms and Tx to 200ms */ 1349 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0); 1350 } 1351 } 1352