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 37 static int panel_type; 38 39 static const void * 40 find_section(const void *_bdb, int section_id) 41 { 42 const struct bdb_header *bdb = _bdb; 43 const u8 *base = _bdb; 44 int index = 0; 45 u32 total, current_size; 46 u8 current_id; 47 48 /* skip to first section */ 49 index += bdb->header_size; 50 total = bdb->bdb_size; 51 52 /* walk the sections looking for section_id */ 53 while (index + 3 < total) { 54 current_id = *(base + index); 55 index++; 56 57 current_size = *((const u16 *)(base + index)); 58 index += 2; 59 60 /* The MIPI Sequence Block v3+ has a separate size field. */ 61 if (current_id == BDB_MIPI_SEQUENCE && *(base + index) >= 3) 62 current_size = *((const u32 *)(base + index + 1)); 63 64 if (index + current_size > total) 65 return NULL; 66 67 if (current_id == section_id) 68 return base + index; 69 70 index += current_size; 71 } 72 73 return NULL; 74 } 75 76 #pragma GCC diagnostic ignored "-Wcast-qual" 77 static u16 78 get_blocksize(const void *p) 79 { 80 u16 *block_ptr, block_size; 81 82 block_ptr = (u16 *)((char *)p - 2); 83 block_size = *block_ptr; 84 return block_size; 85 } 86 #pragma GCC diagnostic pop 87 88 static void 89 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode, 90 const struct lvds_dvo_timing *dvo_timing) 91 { 92 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) | 93 dvo_timing->hactive_lo; 94 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay + 95 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo); 96 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start + 97 dvo_timing->hsync_pulse_width; 98 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay + 99 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo); 100 101 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) | 102 dvo_timing->vactive_lo; 103 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay + 104 dvo_timing->vsync_off; 105 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start + 106 dvo_timing->vsync_pulse_width; 107 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay + 108 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo); 109 panel_fixed_mode->clock = dvo_timing->clock * 10; 110 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED; 111 112 if (dvo_timing->hsync_positive) 113 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC; 114 else 115 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC; 116 117 if (dvo_timing->vsync_positive) 118 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC; 119 else 120 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC; 121 122 /* Some VBTs have bogus h/vtotal values */ 123 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal) 124 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1; 125 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal) 126 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1; 127 128 drm_mode_set_name(panel_fixed_mode); 129 } 130 131 static const struct lvds_dvo_timing * 132 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data, 133 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs, 134 int index) 135 { 136 /* 137 * the size of fp_timing varies on the different platform. 138 * So calculate the DVO timing relative offset in LVDS data 139 * entry to get the DVO timing entry 140 */ 141 142 int lfp_data_size = 143 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset - 144 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset; 145 int dvo_timing_offset = 146 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset - 147 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset; 148 const char *entry = (const char *)lvds_lfp_data->data + lfp_data_size * index; 149 150 return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset); 151 } 152 153 /* get lvds_fp_timing entry 154 * this function may return NULL if the corresponding entry is invalid 155 */ 156 static const struct lvds_fp_timing * 157 get_lvds_fp_timing(const struct bdb_header *bdb, 158 const struct bdb_lvds_lfp_data *data, 159 const struct bdb_lvds_lfp_data_ptrs *ptrs, 160 int index) 161 { 162 size_t data_ofs = (const u8 *)data - (const u8 *)bdb; 163 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */ 164 size_t ofs; 165 166 if (index >= ARRAY_SIZE(ptrs->ptr)) 167 return NULL; 168 ofs = ptrs->ptr[index].fp_timing_offset; 169 if (ofs < data_ofs || 170 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size) 171 return NULL; 172 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs); 173 } 174 175 /* Try to find integrated panel data */ 176 static void 177 parse_lfp_panel_data(struct drm_i915_private *dev_priv, 178 const struct bdb_header *bdb) 179 { 180 const struct bdb_lvds_options *lvds_options; 181 const struct bdb_lvds_lfp_data *lvds_lfp_data; 182 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs; 183 const struct lvds_dvo_timing *panel_dvo_timing; 184 const struct lvds_fp_timing *fp_timing; 185 struct drm_display_mode *panel_fixed_mode; 186 int drrs_mode; 187 188 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS); 189 if (!lvds_options) 190 return; 191 192 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither; 193 if (lvds_options->panel_type == 0xff) 194 return; 195 196 panel_type = lvds_options->panel_type; 197 198 drrs_mode = (lvds_options->dps_panel_type_bits 199 >> (panel_type * 2)) & MODE_MASK; 200 /* 201 * VBT has static DRRS = 0 and seamless DRRS = 2. 202 * The below piece of code is required to adjust vbt.drrs_type 203 * to match the enum drrs_support_type. 204 */ 205 switch (drrs_mode) { 206 case 0: 207 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT; 208 DRM_DEBUG_KMS("DRRS supported mode is static\n"); 209 break; 210 case 2: 211 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT; 212 DRM_DEBUG_KMS("DRRS supported mode is seamless\n"); 213 break; 214 default: 215 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; 216 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n"); 217 break; 218 } 219 220 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA); 221 if (!lvds_lfp_data) 222 return; 223 224 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS); 225 if (!lvds_lfp_data_ptrs) 226 return; 227 228 dev_priv->vbt.lvds_vbt = 1; 229 230 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data, 231 lvds_lfp_data_ptrs, 232 lvds_options->panel_type); 233 234 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 235 if (!panel_fixed_mode) 236 return; 237 238 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing); 239 240 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode; 241 242 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n"); 243 drm_mode_debug_printmodeline(panel_fixed_mode); 244 245 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data, 246 lvds_lfp_data_ptrs, 247 lvds_options->panel_type); 248 if (fp_timing) { 249 /* check the resolution, just to be sure */ 250 if (fp_timing->x_res == panel_fixed_mode->hdisplay && 251 fp_timing->y_res == panel_fixed_mode->vdisplay) { 252 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val; 253 DRM_DEBUG_KMS("VBT initial LVDS value %x\n", 254 dev_priv->vbt.bios_lvds_val); 255 } 256 } 257 } 258 259 static void 260 parse_lfp_backlight(struct drm_i915_private *dev_priv, 261 const struct bdb_header *bdb) 262 { 263 const struct bdb_lfp_backlight_data *backlight_data; 264 const struct bdb_lfp_backlight_data_entry *entry; 265 266 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT); 267 if (!backlight_data) 268 return; 269 270 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) { 271 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n", 272 backlight_data->entry_size); 273 return; 274 } 275 276 entry = &backlight_data->data[panel_type]; 277 278 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM; 279 if (!dev_priv->vbt.backlight.present) { 280 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n", 281 entry->type); 282 return; 283 } 284 285 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz; 286 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm; 287 dev_priv->vbt.backlight.min_brightness = entry->min_brightness; 288 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, " 289 "active %s, min brightness %u, level %u\n", 290 dev_priv->vbt.backlight.pwm_freq_hz, 291 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high", 292 dev_priv->vbt.backlight.min_brightness, 293 backlight_data->level[panel_type]); 294 } 295 296 /* Try to find sdvo panel data */ 297 static void 298 parse_sdvo_panel_data(struct drm_i915_private *dev_priv, 299 const struct bdb_header *bdb) 300 { 301 const struct lvds_dvo_timing *dvo_timing; 302 struct drm_display_mode *panel_fixed_mode; 303 int index; 304 305 index = i915.vbt_sdvo_panel_type; 306 if (index == -2) { 307 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n"); 308 return; 309 } 310 311 if (index == -1) { 312 const struct bdb_sdvo_lvds_options *sdvo_lvds_options; 313 314 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS); 315 if (!sdvo_lvds_options) 316 return; 317 318 index = sdvo_lvds_options->panel_type; 319 } 320 321 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS); 322 if (!dvo_timing) 323 return; 324 325 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 326 if (!panel_fixed_mode) 327 return; 328 329 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index); 330 331 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode; 332 333 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n"); 334 drm_mode_debug_printmodeline(panel_fixed_mode); 335 } 336 337 static int intel_bios_ssc_frequency(struct drm_device *dev, 338 bool alternate) 339 { 340 switch (INTEL_INFO(dev)->gen) { 341 case 2: 342 return alternate ? 66667 : 48000; 343 case 3: 344 case 4: 345 return alternate ? 100000 : 96000; 346 default: 347 return alternate ? 100000 : 120000; 348 } 349 } 350 351 static void 352 parse_general_features(struct drm_i915_private *dev_priv, 353 const struct bdb_header *bdb) 354 { 355 struct drm_device *dev = dev_priv->dev; 356 const struct bdb_general_features *general; 357 358 general = find_section(bdb, BDB_GENERAL_FEATURES); 359 if (general) { 360 dev_priv->vbt.int_tv_support = general->int_tv_support; 361 dev_priv->vbt.int_crt_support = general->int_crt_support; 362 dev_priv->vbt.lvds_use_ssc = general->enable_ssc; 363 dev_priv->vbt.lvds_ssc_freq = 364 intel_bios_ssc_frequency(dev, general->ssc_freq); 365 dev_priv->vbt.display_clock_mode = general->display_clock_mode; 366 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted; 367 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", 368 dev_priv->vbt.int_tv_support, 369 dev_priv->vbt.int_crt_support, 370 dev_priv->vbt.lvds_use_ssc, 371 dev_priv->vbt.lvds_ssc_freq, 372 dev_priv->vbt.display_clock_mode, 373 dev_priv->vbt.fdi_rx_polarity_inverted); 374 } 375 } 376 377 static void 378 parse_general_definitions(struct drm_i915_private *dev_priv, 379 const struct bdb_header *bdb) 380 { 381 const struct bdb_general_definitions *general; 382 383 general = find_section(bdb, BDB_GENERAL_DEFINITIONS); 384 if (general) { 385 u16 block_size = get_blocksize(general); 386 if (block_size >= sizeof(*general)) { 387 int bus_pin = general->crt_ddc_gmbus_pin; 388 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin); 389 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin)) 390 dev_priv->vbt.crt_ddc_pin = bus_pin; 391 } else { 392 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n", 393 block_size); 394 } 395 } 396 } 397 398 static const union child_device_config * 399 child_device_ptr(const struct bdb_general_definitions *p_defs, int i) 400 { 401 return (const void *) &p_defs->devices[i * p_defs->child_dev_size]; 402 } 403 404 static void 405 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, 406 const struct bdb_header *bdb) 407 { 408 struct sdvo_device_mapping *p_mapping; 409 const struct bdb_general_definitions *p_defs; 410 const struct old_child_dev_config *child; /* legacy */ 411 int i, child_device_num, count; 412 u16 block_size; 413 414 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 415 if (!p_defs) { 416 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n"); 417 return; 418 } 419 420 /* 421 * Only parse SDVO mappings when the general definitions block child 422 * device size matches that of the *legacy* child device config 423 * struct. Thus, SDVO mapping will be skipped for newer VBT. 424 */ 425 if (p_defs->child_dev_size != sizeof(*child)) { 426 DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n"); 427 return; 428 } 429 /* get the block size of general definitions */ 430 block_size = get_blocksize(p_defs); 431 /* get the number of child device */ 432 child_device_num = (block_size - sizeof(*p_defs)) / 433 p_defs->child_dev_size; 434 count = 0; 435 for (i = 0; i < child_device_num; i++) { 436 child = &child_device_ptr(p_defs, i)->old; 437 if (!child->device_type) { 438 /* skip the device block if device type is invalid */ 439 continue; 440 } 441 if (child->slave_addr != SLAVE_ADDR1 && 442 child->slave_addr != SLAVE_ADDR2) { 443 /* 444 * If the slave address is neither 0x70 nor 0x72, 445 * it is not a SDVO device. Skip it. 446 */ 447 continue; 448 } 449 if (child->dvo_port != DEVICE_PORT_DVOB && 450 child->dvo_port != DEVICE_PORT_DVOC) { 451 /* skip the incorrect SDVO port */ 452 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n"); 453 continue; 454 } 455 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on" 456 " %s port\n", 457 child->slave_addr, 458 (child->dvo_port == DEVICE_PORT_DVOB) ? 459 "SDVOB" : "SDVOC"); 460 p_mapping = &(dev_priv->sdvo_mappings[child->dvo_port - 1]); 461 if (!p_mapping->initialized) { 462 p_mapping->dvo_port = child->dvo_port; 463 p_mapping->slave_addr = child->slave_addr; 464 p_mapping->dvo_wiring = child->dvo_wiring; 465 p_mapping->ddc_pin = child->ddc_pin; 466 p_mapping->i2c_pin = child->i2c_pin; 467 p_mapping->initialized = 1; 468 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n", 469 p_mapping->dvo_port, 470 p_mapping->slave_addr, 471 p_mapping->dvo_wiring, 472 p_mapping->ddc_pin, 473 p_mapping->i2c_pin); 474 } else { 475 DRM_DEBUG_KMS("Maybe one SDVO port is shared by " 476 "two SDVO device.\n"); 477 } 478 if (child->slave2_addr) { 479 /* Maybe this is a SDVO device with multiple inputs */ 480 /* And the mapping info is not added */ 481 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this" 482 " is a SDVO device with multiple inputs.\n"); 483 } 484 count++; 485 } 486 487 if (!count) { 488 /* No SDVO device info is found */ 489 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n"); 490 } 491 return; 492 } 493 494 static void 495 parse_driver_features(struct drm_i915_private *dev_priv, 496 const struct bdb_header *bdb) 497 { 498 const struct bdb_driver_features *driver; 499 500 driver = find_section(bdb, BDB_DRIVER_FEATURES); 501 if (!driver) 502 return; 503 504 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP) 505 dev_priv->vbt.edp_support = 1; 506 507 if (driver->dual_frequency) 508 dev_priv->render_reclock_avail = true; 509 510 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled); 511 /* 512 * If DRRS is not supported, drrs_type has to be set to 0. 513 * This is because, VBT is configured in such a way that 514 * static DRRS is 0 and DRRS not supported is represented by 515 * driver->drrs_enabled=false 516 */ 517 if (!driver->drrs_enabled) 518 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; 519 } 520 521 static void 522 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) 523 { 524 const struct bdb_edp *edp; 525 const struct edp_power_seq *edp_pps; 526 const struct edp_link_params *edp_link_params; 527 528 edp = find_section(bdb, BDB_EDP); 529 if (!edp) { 530 if (dev_priv->vbt.edp_support) 531 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n"); 532 return; 533 } 534 535 switch ((edp->color_depth >> (panel_type * 2)) & 3) { 536 case EDP_18BPP: 537 dev_priv->vbt.edp_bpp = 18; 538 break; 539 case EDP_24BPP: 540 dev_priv->vbt.edp_bpp = 24; 541 break; 542 case EDP_30BPP: 543 dev_priv->vbt.edp_bpp = 30; 544 break; 545 } 546 547 /* Get the eDP sequencing and link info */ 548 edp_pps = &edp->power_seqs[panel_type]; 549 edp_link_params = &edp->link_params[panel_type]; 550 551 dev_priv->vbt.edp_pps = *edp_pps; 552 553 switch (edp_link_params->rate) { 554 case EDP_RATE_1_62: 555 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62; 556 break; 557 case EDP_RATE_2_7: 558 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7; 559 break; 560 default: 561 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n", 562 edp_link_params->rate); 563 break; 564 } 565 566 switch (edp_link_params->lanes) { 567 case EDP_LANE_1: 568 dev_priv->vbt.edp_lanes = 1; 569 break; 570 case EDP_LANE_2: 571 dev_priv->vbt.edp_lanes = 2; 572 break; 573 case EDP_LANE_4: 574 dev_priv->vbt.edp_lanes = 4; 575 break; 576 default: 577 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n", 578 edp_link_params->lanes); 579 break; 580 } 581 582 switch (edp_link_params->preemphasis) { 583 case EDP_PREEMPHASIS_NONE: 584 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0; 585 break; 586 case EDP_PREEMPHASIS_3_5dB: 587 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1; 588 break; 589 case EDP_PREEMPHASIS_6dB: 590 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2; 591 break; 592 case EDP_PREEMPHASIS_9_5dB: 593 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3; 594 break; 595 default: 596 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n", 597 edp_link_params->preemphasis); 598 break; 599 } 600 601 switch (edp_link_params->vswing) { 602 case EDP_VSWING_0_4V: 603 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0; 604 break; 605 case EDP_VSWING_0_6V: 606 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1; 607 break; 608 case EDP_VSWING_0_8V: 609 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2; 610 break; 611 case EDP_VSWING_1_2V: 612 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3; 613 break; 614 default: 615 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n", 616 edp_link_params->vswing); 617 break; 618 } 619 620 if (bdb->version >= 173) { 621 uint8_t vswing; 622 623 /* Don't read from VBT if module parameter has valid value*/ 624 if (i915.edp_vswing) { 625 dev_priv->edp_low_vswing = i915.edp_vswing == 1; 626 } else { 627 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF; 628 dev_priv->edp_low_vswing = vswing == 0; 629 } 630 } 631 } 632 633 static void 634 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) 635 { 636 const struct bdb_psr *psr; 637 const struct psr_table *psr_table; 638 639 psr = find_section(bdb, BDB_PSR); 640 if (!psr) { 641 DRM_DEBUG_KMS("No PSR BDB found.\n"); 642 return; 643 } 644 645 psr_table = &psr->psr_table[panel_type]; 646 647 dev_priv->vbt.psr.full_link = psr_table->full_link; 648 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup; 649 650 /* Allowed VBT values goes from 0 to 15 */ 651 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 : 652 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames; 653 654 switch (psr_table->lines_to_wait) { 655 case 0: 656 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT; 657 break; 658 case 1: 659 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT; 660 break; 661 case 2: 662 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT; 663 break; 664 case 3: 665 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT; 666 break; 667 default: 668 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n", 669 psr_table->lines_to_wait); 670 break; 671 } 672 673 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time; 674 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time; 675 } 676 677 static u8 *goto_next_sequence(u8 *data, int *size) 678 { 679 u16 len; 680 int tmp = *size; 681 682 if (--tmp < 0) 683 return NULL; 684 685 /* goto first element */ 686 data++; 687 while (1) { 688 switch (*data) { 689 case MIPI_SEQ_ELEM_SEND_PKT: 690 /* 691 * skip by this element payload size 692 * skip elem id, command flag and data type 693 */ 694 tmp -= 5; 695 if (tmp < 0) 696 return NULL; 697 698 data += 3; 699 len = *((u16 *)data); 700 701 tmp -= len; 702 if (tmp < 0) 703 return NULL; 704 705 /* skip by len */ 706 data = data + 2 + len; 707 break; 708 case MIPI_SEQ_ELEM_DELAY: 709 /* skip by elem id, and delay is 4 bytes */ 710 tmp -= 5; 711 if (tmp < 0) 712 return NULL; 713 714 data += 5; 715 break; 716 case MIPI_SEQ_ELEM_GPIO: 717 tmp -= 3; 718 if (tmp < 0) 719 return NULL; 720 721 data += 3; 722 break; 723 default: 724 DRM_ERROR("Unknown element\n"); 725 return NULL; 726 } 727 728 /* end of sequence ? */ 729 if (*data == 0) 730 break; 731 } 732 733 /* goto next sequence or end of block byte */ 734 if (--tmp < 0) 735 return NULL; 736 737 data++; 738 739 /* update amount of data left for the sequence block to be parsed */ 740 *size = tmp; 741 return data; 742 } 743 744 static void 745 parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb) 746 { 747 const struct bdb_mipi_config *start; 748 const struct bdb_mipi_sequence *sequence; 749 const struct mipi_config *config; 750 const struct mipi_pps_data *pps; 751 u8 *data; 752 const u8 *seq_data; 753 int i, panel_id, seq_size; 754 u16 block_size; 755 756 /* parse MIPI blocks only if LFP type is MIPI */ 757 if (!dev_priv->vbt.has_mipi) 758 return; 759 760 /* Initialize this to undefined indicating no generic MIPI support */ 761 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID; 762 763 /* Block #40 is already parsed and panel_fixed_mode is 764 * stored in dev_priv->lfp_lvds_vbt_mode 765 * resuse this when needed 766 */ 767 768 /* Parse #52 for panel index used from panel_type already 769 * parsed 770 */ 771 start = find_section(bdb, BDB_MIPI_CONFIG); 772 if (!start) { 773 DRM_DEBUG_KMS("No MIPI config BDB found"); 774 return; 775 } 776 777 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n", 778 panel_type); 779 780 /* 781 * get hold of the correct configuration block and pps data as per 782 * the panel_type as index 783 */ 784 config = &start->config[panel_type]; 785 pps = &start->pps[panel_type]; 786 787 /* store as of now full data. Trim when we realise all is not needed */ 788 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL); 789 if (!dev_priv->vbt.dsi.config) 790 return; 791 792 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL); 793 if (!dev_priv->vbt.dsi.pps) { 794 kfree(dev_priv->vbt.dsi.config); 795 return; 796 } 797 798 /* We have mandatory mipi config blocks. Initialize as generic panel */ 799 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID; 800 801 /* Check if we have sequence block as well */ 802 sequence = find_section(bdb, BDB_MIPI_SEQUENCE); 803 if (!sequence) { 804 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n"); 805 return; 806 } 807 808 /* Fail gracefully for forward incompatible sequence block. */ 809 if (sequence->version >= 3) { 810 DRM_ERROR("Unable to parse MIPI Sequence Block v3+\n"); 811 return; 812 } 813 814 DRM_DEBUG_DRIVER("Found MIPI sequence block\n"); 815 816 block_size = get_blocksize(sequence); 817 818 /* 819 * parse the sequence block for individual sequences 820 */ 821 dev_priv->vbt.dsi.seq_version = sequence->version; 822 823 seq_data = &sequence->data[0]; 824 825 /* 826 * sequence block is variable length and hence we need to parse and 827 * get the sequence data for specific panel id 828 */ 829 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) { 830 panel_id = *seq_data; 831 #pragma GCC diagnostic ignored "-Wcast-qual" 832 seq_size = *((u16 *) (seq_data + 1)); 833 #pragma GCC diagnostic pop 834 if (panel_id == panel_type) 835 break; 836 837 /* skip the sequence including seq header of 3 bytes */ 838 seq_data = seq_data + 3 + seq_size; 839 if ((seq_data - &sequence->data[0]) > block_size) { 840 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n"); 841 return; 842 } 843 } 844 845 if (i == MAX_MIPI_CONFIGURATIONS) { 846 DRM_ERROR("Sequence block detected but no valid configuration\n"); 847 return; 848 } 849 850 /* check if found sequence is completely within the sequence block 851 * just being paranoid */ 852 if (seq_size > block_size) { 853 DRM_ERROR("Corrupted sequence/size, bailing out\n"); 854 return; 855 } 856 857 /* skip the panel id(1 byte) and seq size(2 bytes) */ 858 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL); 859 if (!dev_priv->vbt.dsi.data) 860 return; 861 862 /* 863 * loop into the sequence data and split into multiple sequneces 864 * There are only 5 types of sequences as of now 865 */ 866 data = dev_priv->vbt.dsi.data; 867 dev_priv->vbt.dsi.size = seq_size; 868 869 /* two consecutive 0x00 indicate end of all sequences */ 870 while (1) { 871 int seq_id = *data; 872 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) { 873 dev_priv->vbt.dsi.sequence[seq_id] = data; 874 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id); 875 } else { 876 DRM_ERROR("undefined sequence\n"); 877 goto err; 878 } 879 880 /* partial parsing to skip elements */ 881 data = goto_next_sequence(data, &seq_size); 882 883 if (data == NULL) { 884 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n"); 885 goto err; 886 } 887 888 if (*data == 0) 889 break; /* end of sequence reached */ 890 } 891 892 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n"); 893 return; 894 err: 895 kfree(dev_priv->vbt.dsi.data); 896 dev_priv->vbt.dsi.data = NULL; 897 898 /* error during parsing so set all pointers to null 899 * because of partial parsing */ 900 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence)); 901 } 902 903 static u8 translate_iboost(u8 val) 904 { 905 static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */ 906 907 if (val >= ARRAY_SIZE(mapping)) { 908 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val); 909 return 0; 910 } 911 return mapping[val]; 912 } 913 914 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, 915 const struct bdb_header *bdb) 916 { 917 union child_device_config *it, *child = NULL; 918 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port]; 919 uint8_t hdmi_level_shift; 920 int i, j; 921 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt; 922 uint8_t aux_channel, ddc_pin; 923 /* Each DDI port can have more than one value on the "DVO Port" field, 924 * so look for all the possible values for each port and abort if more 925 * than one is found. */ 926 int dvo_ports[][3] = { 927 {DVO_PORT_HDMIA, DVO_PORT_DPA, -1}, 928 {DVO_PORT_HDMIB, DVO_PORT_DPB, -1}, 929 {DVO_PORT_HDMIC, DVO_PORT_DPC, -1}, 930 {DVO_PORT_HDMID, DVO_PORT_DPD, -1}, 931 {DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE}, 932 }; 933 934 /* Find the child device to use, abort if more than one found. */ 935 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) { 936 it = dev_priv->vbt.child_dev + i; 937 938 for (j = 0; j < 3; j++) { 939 if (dvo_ports[port][j] == -1) 940 break; 941 942 if (it->common.dvo_port == dvo_ports[port][j]) { 943 if (child) { 944 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n", 945 port_name(port)); 946 return; 947 } 948 child = it; 949 } 950 } 951 } 952 if (!child) 953 return; 954 955 aux_channel = child->raw[25]; 956 ddc_pin = child->common.ddc_pin; 957 958 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING; 959 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT; 960 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT; 961 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0; 962 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR); 963 964 info->supports_dvi = is_dvi; 965 info->supports_hdmi = is_hdmi; 966 info->supports_dp = is_dp; 967 968 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n", 969 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt); 970 971 if (is_edp && is_dvi) 972 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n", 973 port_name(port)); 974 if (is_crt && port != PORT_E) 975 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port)); 976 if (is_crt && (is_dvi || is_dp)) 977 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n", 978 port_name(port)); 979 if (is_dvi && (port == PORT_A || port == PORT_E)) 980 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port)); 981 if (!is_dvi && !is_dp && !is_crt) 982 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n", 983 port_name(port)); 984 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E)) 985 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port)); 986 987 if (is_dvi) { 988 if (port == PORT_E) { 989 info->alternate_ddc_pin = ddc_pin; 990 /* if DDIE share ddc pin with other port, then 991 * dvi/hdmi couldn't exist on the shared port. 992 * Otherwise they share the same ddc bin and system 993 * couldn't communicate with them seperately. */ 994 if (ddc_pin == DDC_PIN_B) { 995 dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0; 996 dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0; 997 } else if (ddc_pin == DDC_PIN_C) { 998 dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0; 999 dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0; 1000 } else if (ddc_pin == DDC_PIN_D) { 1001 dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0; 1002 dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0; 1003 } 1004 } else if (ddc_pin == DDC_PIN_B && port != PORT_B) 1005 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n"); 1006 else if (ddc_pin == DDC_PIN_C && port != PORT_C) 1007 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n"); 1008 else if (ddc_pin == DDC_PIN_D && port != PORT_D) 1009 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n"); 1010 } 1011 1012 if (is_dp) { 1013 if (port == PORT_E) { 1014 info->alternate_aux_channel = aux_channel; 1015 /* if DDIE share aux channel with other port, then 1016 * DP couldn't exist on the shared port. Otherwise 1017 * they share the same aux channel and system 1018 * couldn't communicate with them seperately. */ 1019 if (aux_channel == DP_AUX_A) 1020 dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0; 1021 else if (aux_channel == DP_AUX_B) 1022 dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0; 1023 else if (aux_channel == DP_AUX_C) 1024 dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0; 1025 else if (aux_channel == DP_AUX_D) 1026 dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0; 1027 } 1028 else if (aux_channel == DP_AUX_A && port != PORT_A) 1029 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n"); 1030 else if (aux_channel == DP_AUX_B && port != PORT_B) 1031 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n"); 1032 else if (aux_channel == DP_AUX_C && port != PORT_C) 1033 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n"); 1034 else if (aux_channel == DP_AUX_D && port != PORT_D) 1035 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n"); 1036 } 1037 1038 if (bdb->version >= 158) { 1039 /* The VBT HDMI level shift values match the table we have. */ 1040 hdmi_level_shift = child->raw[7] & 0xF; 1041 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n", 1042 port_name(port), 1043 hdmi_level_shift); 1044 info->hdmi_level_shift = hdmi_level_shift; 1045 } 1046 1047 /* Parse the I_boost config for SKL and above */ 1048 if (bdb->version >= 196 && (child->common.flags_1 & IBOOST_ENABLE)) { 1049 info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF); 1050 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n", 1051 port_name(port), info->dp_boost_level); 1052 info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4); 1053 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n", 1054 port_name(port), info->hdmi_boost_level); 1055 } 1056 } 1057 1058 static void parse_ddi_ports(struct drm_i915_private *dev_priv, 1059 const struct bdb_header *bdb) 1060 { 1061 struct drm_device *dev = dev_priv->dev; 1062 enum port port; 1063 1064 if (!HAS_DDI(dev)) 1065 return; 1066 1067 if (!dev_priv->vbt.child_dev_num) 1068 return; 1069 1070 if (bdb->version < 155) 1071 return; 1072 1073 for (port = PORT_A; port < I915_MAX_PORTS; port++) 1074 parse_ddi_port(dev_priv, port, bdb); 1075 } 1076 1077 static void 1078 parse_device_mapping(struct drm_i915_private *dev_priv, 1079 const struct bdb_header *bdb) 1080 { 1081 const struct bdb_general_definitions *p_defs; 1082 const union child_device_config *p_child; 1083 union child_device_config *child_dev_ptr; 1084 int i, child_device_num, count; 1085 u8 expected_size; 1086 u16 block_size; 1087 1088 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 1089 if (!p_defs) { 1090 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n"); 1091 return; 1092 } 1093 if (bdb->version < 195) { 1094 expected_size = sizeof(struct old_child_dev_config); 1095 } else if (bdb->version == 195) { 1096 expected_size = 37; 1097 } else if (bdb->version <= 197) { 1098 expected_size = 38; 1099 } else { 1100 expected_size = 38; 1101 BUILD_BUG_ON(sizeof(*p_child) < 38); 1102 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n", 1103 bdb->version, expected_size); 1104 } 1105 1106 /* The legacy sized child device config is the minimum we need. */ 1107 if (p_defs->child_dev_size < sizeof(struct old_child_dev_config)) { 1108 DRM_ERROR("Child device config size %u is too small.\n", 1109 p_defs->child_dev_size); 1110 return; 1111 } 1112 1113 /* Flag an error for unexpected size, but continue anyway. */ 1114 if (p_defs->child_dev_size != expected_size) 1115 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n", 1116 p_defs->child_dev_size, expected_size, bdb->version); 1117 1118 /* get the block size of general definitions */ 1119 block_size = get_blocksize(p_defs); 1120 /* get the number of child device */ 1121 child_device_num = (block_size - sizeof(*p_defs)) / 1122 p_defs->child_dev_size; 1123 count = 0; 1124 /* get the number of child device that is present */ 1125 for (i = 0; i < child_device_num; i++) { 1126 p_child = child_device_ptr(p_defs, i); 1127 if (!p_child->common.device_type) { 1128 /* skip the device block if device type is invalid */ 1129 continue; 1130 } 1131 count++; 1132 } 1133 if (!count) { 1134 DRM_DEBUG_KMS("no child dev is parsed from VBT\n"); 1135 return; 1136 } 1137 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL); 1138 if (!dev_priv->vbt.child_dev) { 1139 DRM_DEBUG_KMS("No memory space for child device\n"); 1140 return; 1141 } 1142 1143 dev_priv->vbt.child_dev_num = count; 1144 count = 0; 1145 for (i = 0; i < child_device_num; i++) { 1146 p_child = child_device_ptr(p_defs, i); 1147 if (!p_child->common.device_type) { 1148 /* skip the device block if device type is invalid */ 1149 continue; 1150 } 1151 1152 if (p_child->common.dvo_port >= DVO_PORT_MIPIA 1153 && p_child->common.dvo_port <= DVO_PORT_MIPID 1154 &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) { 1155 DRM_DEBUG_KMS("Found MIPI as LFP\n"); 1156 dev_priv->vbt.has_mipi = 1; 1157 dev_priv->vbt.dsi.port = p_child->common.dvo_port; 1158 } 1159 1160 child_dev_ptr = dev_priv->vbt.child_dev + count; 1161 count++; 1162 1163 /* 1164 * Copy as much as we know (sizeof) and is available 1165 * (child_dev_size) of the child device. Accessing the data must 1166 * depend on VBT version. 1167 */ 1168 memcpy(child_dev_ptr, p_child, 1169 min_t(size_t, p_defs->child_dev_size, sizeof(*p_child))); 1170 } 1171 return; 1172 } 1173 1174 static void 1175 init_vbt_defaults(struct drm_i915_private *dev_priv) 1176 { 1177 struct drm_device *dev = dev_priv->dev; 1178 enum port port; 1179 1180 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC; 1181 1182 /* Default to having backlight */ 1183 dev_priv->vbt.backlight.present = true; 1184 1185 /* LFP panel data */ 1186 dev_priv->vbt.lvds_dither = 1; 1187 dev_priv->vbt.lvds_vbt = 0; 1188 1189 /* SDVO panel data */ 1190 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL; 1191 1192 /* general features */ 1193 dev_priv->vbt.int_tv_support = 1; 1194 dev_priv->vbt.int_crt_support = 1; 1195 1196 /* Default to using SSC */ 1197 dev_priv->vbt.lvds_use_ssc = 1; 1198 /* 1199 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference 1200 * clock for LVDS. 1201 */ 1202 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1203 !HAS_PCH_SPLIT(dev)); 1204 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq); 1205 1206 for (port = PORT_A; port < I915_MAX_PORTS; port++) { 1207 struct ddi_vbt_port_info *info = 1208 &dev_priv->vbt.ddi_port_info[port]; 1209 1210 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN; 1211 1212 info->supports_dvi = (port != PORT_A && port != PORT_E); 1213 info->supports_hdmi = info->supports_dvi; 1214 info->supports_dp = (port != PORT_E); 1215 } 1216 } 1217 1218 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id) 1219 { 1220 DRM_DEBUG_KMS("Falling back to manually reading VBT from " 1221 "VBIOS ROM for %s\n", 1222 id->ident); 1223 return 1; 1224 } 1225 1226 static const struct dmi_system_id intel_no_opregion_vbt[] = { 1227 { 1228 .callback = intel_no_opregion_vbt_callback, 1229 .ident = "ThinkCentre A57", 1230 .matches = { 1231 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 1232 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"), 1233 }, 1234 }, 1235 { } 1236 }; 1237 1238 static const struct bdb_header *validate_vbt(const void *base, 1239 size_t size, 1240 const void *_vbt, 1241 const char *source) 1242 { 1243 size_t offset = (const char *)_vbt - (const char *)base; 1244 const struct vbt_header *vbt = _vbt; 1245 const struct bdb_header *bdb; 1246 1247 if (offset + sizeof(struct vbt_header) > size) { 1248 DRM_DEBUG_DRIVER("VBT header incomplete\n"); 1249 return NULL; 1250 } 1251 1252 if (memcmp(vbt->signature, "$VBT", 4)) { 1253 DRM_DEBUG_DRIVER("VBT invalid signature\n"); 1254 return NULL; 1255 } 1256 1257 offset += vbt->bdb_offset; 1258 if (offset + sizeof(struct bdb_header) > size) { 1259 DRM_DEBUG_DRIVER("BDB header incomplete\n"); 1260 return NULL; 1261 } 1262 1263 bdb = (const struct bdb_header *)((const char *)base + offset); 1264 if (offset + bdb->bdb_size > size) { 1265 DRM_DEBUG_DRIVER("BDB incomplete\n"); 1266 return NULL; 1267 } 1268 1269 DRM_DEBUG_KMS("Using VBT from %s: %20s\n", 1270 source, vbt->signature); 1271 return bdb; 1272 } 1273 1274 static const struct bdb_header *find_vbt(void __iomem *bios, size_t size) 1275 { 1276 const struct bdb_header *bdb = NULL; 1277 size_t i; 1278 1279 /* Scour memory looking for the VBT signature. */ 1280 for (i = 0; i + 4 < size; i++) { 1281 if (ioread32(bios + i) == *((const u32 *) "$VBT")) { 1282 /* 1283 * This is the one place where we explicitly discard the 1284 * address space (__iomem) of the BIOS/VBT. From now on 1285 * everything is based on 'base', and treated as regular 1286 * memory. 1287 */ 1288 void *_bios = (void __force *) bios; 1289 1290 bdb = validate_vbt(_bios, size, (const char *)_bios + i, "PCI ROM"); 1291 break; 1292 } 1293 } 1294 1295 return bdb; 1296 } 1297 1298 /** 1299 * intel_parse_bios - find VBT and initialize settings from the BIOS 1300 * @dev: DRM device 1301 * 1302 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers 1303 * to appropriate values. 1304 * 1305 * Returns 0 on success, nonzero on failure. 1306 */ 1307 int 1308 intel_parse_bios(struct drm_device *dev) 1309 { 1310 struct drm_i915_private *dev_priv = dev->dev_private; 1311 #if 0 1312 struct pci_dev *pdev = dev->pdev; 1313 #endif 1314 const struct bdb_header *bdb = NULL; 1315 u8 __iomem *bios = NULL; 1316 1317 if (HAS_PCH_NOP(dev)) 1318 return -ENODEV; 1319 1320 init_vbt_defaults(dev_priv); 1321 1322 /* XXX Should this validation be moved to intel_opregion.c? */ 1323 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) 1324 bdb = validate_vbt(dev_priv->opregion.header, OPREGION_SIZE, 1325 dev_priv->opregion.vbt, "OpRegion"); 1326 1327 if (bdb == NULL) { 1328 size_t size; 1329 1330 #if 0 1331 bios = pci_map_rom(pdev, &size); 1332 if (!bios) 1333 #endif 1334 return -1; 1335 1336 bdb = find_vbt(bios, size); 1337 if (!bdb) { 1338 #if 0 1339 pci_unmap_rom(pdev, bios); 1340 #endif 1341 return -1; 1342 } 1343 } 1344 1345 /* Grab useful general definitions */ 1346 parse_general_features(dev_priv, bdb); 1347 parse_general_definitions(dev_priv, bdb); 1348 parse_lfp_panel_data(dev_priv, bdb); 1349 parse_lfp_backlight(dev_priv, bdb); 1350 parse_sdvo_panel_data(dev_priv, bdb); 1351 parse_sdvo_device_mapping(dev_priv, bdb); 1352 parse_device_mapping(dev_priv, bdb); 1353 parse_driver_features(dev_priv, bdb); 1354 parse_edp(dev_priv, bdb); 1355 parse_psr(dev_priv, bdb); 1356 parse_mipi(dev_priv, bdb); 1357 parse_ddi_ports(dev_priv, bdb); 1358 1359 #if 0 1360 if (bios) 1361 pci_unmap_rom(pdev, bios); 1362 #endif 1363 1364 return 0; 1365 } 1366