1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2006 Intel Corporation 4 * 5 * Authors: 6 * Eric Anholt <eric@anholt.net> 7 */ 8 9 #include <drm/display/drm_dp_helper.h> 10 #include <drm/drm.h> 11 12 #include "intel_bios.h" 13 #include "psb_drv.h" 14 #include "psb_intel_drv.h" 15 #include "psb_intel_reg.h" 16 17 #define SLAVE_ADDR1 0x70 18 #define SLAVE_ADDR2 0x72 19 20 static void *find_section(struct bdb_header *bdb, int section_id) 21 { 22 u8 *base = (u8 *)bdb; 23 int index = 0; 24 u16 total, current_size; 25 u8 current_id; 26 27 /* skip to first section */ 28 index += bdb->header_size; 29 total = bdb->bdb_size; 30 31 /* walk the sections looking for section_id */ 32 while (index < total) { 33 current_id = *(base + index); 34 index++; 35 current_size = *((u16 *)(base + index)); 36 index += 2; 37 if (current_id == section_id) 38 return base + index; 39 index += current_size; 40 } 41 42 return NULL; 43 } 44 45 static void 46 parse_edp(struct drm_psb_private *dev_priv, struct bdb_header *bdb) 47 { 48 struct bdb_edp *edp; 49 struct edp_power_seq *edp_pps; 50 struct edp_link_params *edp_link_params; 51 uint8_t panel_type; 52 53 edp = find_section(bdb, BDB_EDP); 54 55 dev_priv->edp.bpp = 18; 56 if (!edp) { 57 if (dev_priv->edp.support) { 58 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported, assume %dbpp panel color depth.\n", 59 dev_priv->edp.bpp); 60 } 61 return; 62 } 63 64 panel_type = dev_priv->panel_type; 65 switch ((edp->color_depth >> (panel_type * 2)) & 3) { 66 case EDP_18BPP: 67 dev_priv->edp.bpp = 18; 68 break; 69 case EDP_24BPP: 70 dev_priv->edp.bpp = 24; 71 break; 72 case EDP_30BPP: 73 dev_priv->edp.bpp = 30; 74 break; 75 } 76 77 /* Get the eDP sequencing and link info */ 78 edp_pps = &edp->power_seqs[panel_type]; 79 edp_link_params = &edp->link_params[panel_type]; 80 81 dev_priv->edp.pps = *edp_pps; 82 83 DRM_DEBUG_KMS("EDP timing in vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n", 84 dev_priv->edp.pps.t1_t3, dev_priv->edp.pps.t8, 85 dev_priv->edp.pps.t9, dev_priv->edp.pps.t10, 86 dev_priv->edp.pps.t11_t12); 87 88 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 : 89 DP_LINK_BW_1_62; 90 switch (edp_link_params->lanes) { 91 case 0: 92 dev_priv->edp.lanes = 1; 93 break; 94 case 1: 95 dev_priv->edp.lanes = 2; 96 break; 97 case 3: 98 default: 99 dev_priv->edp.lanes = 4; 100 break; 101 } 102 DRM_DEBUG_KMS("VBT reports EDP: Lane_count %d, Lane_rate %d, Bpp %d\n", 103 dev_priv->edp.lanes, dev_priv->edp.rate, dev_priv->edp.bpp); 104 105 switch (edp_link_params->preemphasis) { 106 case 0: 107 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0; 108 break; 109 case 1: 110 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1; 111 break; 112 case 2: 113 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2; 114 break; 115 case 3: 116 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3; 117 break; 118 } 119 switch (edp_link_params->vswing) { 120 case 0: 121 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0; 122 break; 123 case 1: 124 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1; 125 break; 126 case 2: 127 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2; 128 break; 129 case 3: 130 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3; 131 break; 132 } 133 DRM_DEBUG_KMS("VBT reports EDP: VSwing %d, Preemph %d\n", 134 dev_priv->edp.vswing, dev_priv->edp.preemphasis); 135 } 136 137 static u16 138 get_blocksize(void *p) 139 { 140 u16 *block_ptr, block_size; 141 142 block_ptr = (u16 *)((char *)p - 2); 143 block_size = *block_ptr; 144 return block_size; 145 } 146 147 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode, 148 struct lvds_dvo_timing *dvo_timing) 149 { 150 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) | 151 dvo_timing->hactive_lo; 152 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay + 153 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo); 154 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start + 155 dvo_timing->hsync_pulse_width; 156 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay + 157 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo); 158 159 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) | 160 dvo_timing->vactive_lo; 161 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay + 162 dvo_timing->vsync_off; 163 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start + 164 dvo_timing->vsync_pulse_width; 165 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay + 166 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo); 167 panel_fixed_mode->clock = dvo_timing->clock * 10; 168 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED; 169 170 if (dvo_timing->hsync_positive) 171 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC; 172 else 173 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC; 174 175 if (dvo_timing->vsync_positive) 176 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC; 177 else 178 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC; 179 180 /* Some VBTs have bogus h/vtotal values */ 181 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal) 182 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1; 183 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal) 184 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1; 185 186 drm_mode_set_name(panel_fixed_mode); 187 } 188 189 static void parse_backlight_data(struct drm_psb_private *dev_priv, 190 struct bdb_header *bdb) 191 { 192 struct bdb_lvds_backlight *vbt_lvds_bl = NULL; 193 struct bdb_lvds_backlight *lvds_bl; 194 u8 p_type = 0; 195 void *bl_start = NULL; 196 struct bdb_lvds_options *lvds_opts 197 = find_section(bdb, BDB_LVDS_OPTIONS); 198 199 dev_priv->lvds_bl = NULL; 200 201 if (lvds_opts) 202 p_type = lvds_opts->panel_type; 203 else 204 return; 205 206 bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT); 207 vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type; 208 209 lvds_bl = kmemdup(vbt_lvds_bl, sizeof(*vbt_lvds_bl), GFP_KERNEL); 210 if (!lvds_bl) { 211 dev_err(dev_priv->dev.dev, "out of memory for backlight data\n"); 212 return; 213 } 214 dev_priv->lvds_bl = lvds_bl; 215 } 216 217 /* Try to find integrated panel data */ 218 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv, 219 struct bdb_header *bdb) 220 { 221 struct bdb_lvds_options *lvds_options; 222 struct bdb_lvds_lfp_data *lvds_lfp_data; 223 struct bdb_lvds_lfp_data_entry *entry; 224 struct lvds_dvo_timing *dvo_timing; 225 struct drm_display_mode *panel_fixed_mode; 226 227 /* Defaults if we can't find VBT info */ 228 dev_priv->lvds_dither = 0; 229 dev_priv->lvds_vbt = 0; 230 231 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS); 232 if (!lvds_options) 233 return; 234 235 dev_priv->lvds_dither = lvds_options->pixel_dither; 236 dev_priv->panel_type = lvds_options->panel_type; 237 238 if (lvds_options->panel_type == 0xff) 239 return; 240 241 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA); 242 if (!lvds_lfp_data) 243 return; 244 245 246 entry = &lvds_lfp_data->data[lvds_options->panel_type]; 247 dvo_timing = &entry->dvo_timing; 248 249 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), 250 GFP_KERNEL); 251 if (panel_fixed_mode == NULL) { 252 dev_err(dev_priv->dev.dev, "out of memory for fixed panel mode\n"); 253 return; 254 } 255 256 dev_priv->lvds_vbt = 1; 257 fill_detail_timing_data(panel_fixed_mode, dvo_timing); 258 259 if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) { 260 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode; 261 drm_mode_debug_printmodeline(panel_fixed_mode); 262 } else { 263 dev_dbg(dev_priv->dev.dev, "ignoring invalid LVDS VBT\n"); 264 dev_priv->lvds_vbt = 0; 265 kfree(panel_fixed_mode); 266 } 267 return; 268 } 269 270 /* Try to find sdvo panel data */ 271 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv, 272 struct bdb_header *bdb) 273 { 274 struct bdb_sdvo_lvds_options *sdvo_lvds_options; 275 struct lvds_dvo_timing *dvo_timing; 276 struct drm_display_mode *panel_fixed_mode; 277 278 dev_priv->sdvo_lvds_vbt_mode = NULL; 279 280 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS); 281 if (!sdvo_lvds_options) 282 return; 283 284 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS); 285 if (!dvo_timing) 286 return; 287 288 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL); 289 290 if (!panel_fixed_mode) 291 return; 292 293 fill_detail_timing_data(panel_fixed_mode, 294 dvo_timing + sdvo_lvds_options->panel_type); 295 296 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode; 297 298 return; 299 } 300 301 static void parse_general_features(struct drm_psb_private *dev_priv, 302 struct bdb_header *bdb) 303 { 304 struct bdb_general_features *general; 305 306 /* Set sensible defaults in case we can't find the general block */ 307 dev_priv->int_tv_support = 1; 308 dev_priv->int_crt_support = 1; 309 310 general = find_section(bdb, BDB_GENERAL_FEATURES); 311 if (general) { 312 dev_priv->int_tv_support = general->int_tv_support; 313 dev_priv->int_crt_support = general->int_crt_support; 314 dev_priv->lvds_use_ssc = general->enable_ssc; 315 316 if (dev_priv->lvds_use_ssc) { 317 dev_priv->lvds_ssc_freq 318 = general->ssc_freq ? 100 : 96; 319 } 320 } 321 } 322 323 static void 324 parse_sdvo_device_mapping(struct drm_psb_private *dev_priv, 325 struct bdb_header *bdb) 326 { 327 struct sdvo_device_mapping *p_mapping; 328 struct bdb_general_definitions *p_defs; 329 struct child_device_config *p_child; 330 int i, child_device_num, count; 331 u16 block_size; 332 333 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 334 if (!p_defs) { 335 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n"); 336 return; 337 } 338 /* judge whether the size of child device meets the requirements. 339 * If the child device size obtained from general definition block 340 * is different with sizeof(struct child_device_config), skip the 341 * parsing of sdvo device info 342 */ 343 if (p_defs->child_dev_size != sizeof(*p_child)) { 344 /* different child dev size . Ignore it */ 345 DRM_DEBUG_KMS("different child size is found. Invalid.\n"); 346 return; 347 } 348 /* get the block size of general definitions */ 349 block_size = get_blocksize(p_defs); 350 /* get the number of child device */ 351 child_device_num = (block_size - sizeof(*p_defs)) / 352 sizeof(*p_child); 353 count = 0; 354 for (i = 0; i < child_device_num; i++) { 355 p_child = &(p_defs->devices[i]); 356 if (!p_child->device_type) { 357 /* skip the device block if device type is invalid */ 358 continue; 359 } 360 if (p_child->slave_addr != SLAVE_ADDR1 && 361 p_child->slave_addr != SLAVE_ADDR2) { 362 /* 363 * If the slave address is neither 0x70 nor 0x72, 364 * it is not a SDVO device. Skip it. 365 */ 366 continue; 367 } 368 if (p_child->dvo_port != DEVICE_PORT_DVOB && 369 p_child->dvo_port != DEVICE_PORT_DVOC) { 370 /* skip the incorrect SDVO port */ 371 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n"); 372 continue; 373 } 374 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on" 375 " %s port\n", 376 p_child->slave_addr, 377 (p_child->dvo_port == DEVICE_PORT_DVOB) ? 378 "SDVOB" : "SDVOC"); 379 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]); 380 if (!p_mapping->initialized) { 381 p_mapping->dvo_port = p_child->dvo_port; 382 p_mapping->slave_addr = p_child->slave_addr; 383 p_mapping->dvo_wiring = p_child->dvo_wiring; 384 p_mapping->ddc_pin = p_child->ddc_pin; 385 p_mapping->i2c_pin = p_child->i2c_pin; 386 p_mapping->initialized = 1; 387 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n", 388 p_mapping->dvo_port, 389 p_mapping->slave_addr, 390 p_mapping->dvo_wiring, 391 p_mapping->ddc_pin, 392 p_mapping->i2c_pin); 393 } else { 394 DRM_DEBUG_KMS("Maybe one SDVO port is shared by " 395 "two SDVO device.\n"); 396 } 397 if (p_child->slave2_addr) { 398 /* Maybe this is a SDVO device with multiple inputs */ 399 /* And the mapping info is not added */ 400 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this" 401 " is a SDVO device with multiple inputs.\n"); 402 } 403 count++; 404 } 405 406 if (!count) { 407 /* No SDVO device info is found */ 408 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n"); 409 } 410 return; 411 } 412 413 414 static void 415 parse_driver_features(struct drm_psb_private *dev_priv, 416 struct bdb_header *bdb) 417 { 418 struct bdb_driver_features *driver; 419 420 driver = find_section(bdb, BDB_DRIVER_FEATURES); 421 if (!driver) 422 return; 423 424 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP) 425 dev_priv->edp.support = 1; 426 427 dev_priv->lvds_enabled_in_vbt = driver->lvds_config != 0; 428 DRM_DEBUG_KMS("LVDS VBT config bits: 0x%x\n", driver->lvds_config); 429 430 /* This bit means to use 96Mhz for DPLL_A or not */ 431 if (driver->primary_lfp_id) 432 dev_priv->dplla_96mhz = true; 433 else 434 dev_priv->dplla_96mhz = false; 435 } 436 437 static void 438 parse_device_mapping(struct drm_psb_private *dev_priv, 439 struct bdb_header *bdb) 440 { 441 struct bdb_general_definitions *p_defs; 442 struct child_device_config *p_child, *child_dev_ptr; 443 int i, child_device_num, count; 444 u16 block_size; 445 446 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); 447 if (!p_defs) { 448 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n"); 449 return; 450 } 451 /* judge whether the size of child device meets the requirements. 452 * If the child device size obtained from general definition block 453 * is different with sizeof(struct child_device_config), skip the 454 * parsing of sdvo device info 455 */ 456 if (p_defs->child_dev_size != sizeof(*p_child)) { 457 /* different child dev size . Ignore it */ 458 DRM_DEBUG_KMS("different child size is found. Invalid.\n"); 459 return; 460 } 461 /* get the block size of general definitions */ 462 block_size = get_blocksize(p_defs); 463 /* get the number of child device */ 464 child_device_num = (block_size - sizeof(*p_defs)) / 465 sizeof(*p_child); 466 count = 0; 467 /* get the number of child devices that are present */ 468 for (i = 0; i < child_device_num; i++) { 469 p_child = &(p_defs->devices[i]); 470 if (!p_child->device_type) { 471 /* skip the device block if device type is invalid */ 472 continue; 473 } 474 count++; 475 } 476 if (!count) { 477 DRM_DEBUG_KMS("no child dev is parsed from VBT\n"); 478 return; 479 } 480 dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL); 481 if (!dev_priv->child_dev) { 482 DRM_DEBUG_KMS("No memory space for child devices\n"); 483 return; 484 } 485 486 dev_priv->child_dev_num = count; 487 count = 0; 488 for (i = 0; i < child_device_num; i++) { 489 p_child = &(p_defs->devices[i]); 490 if (!p_child->device_type) { 491 /* skip the device block if device type is invalid */ 492 continue; 493 } 494 child_dev_ptr = dev_priv->child_dev + count; 495 count++; 496 memcpy((void *)child_dev_ptr, (void *)p_child, 497 sizeof(*p_child)); 498 } 499 return; 500 } 501 502 503 /** 504 * psb_intel_init_bios - initialize VBIOS settings & find VBT 505 * @dev: DRM device 506 * 507 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers 508 * to appropriate values. 509 * 510 * VBT existence is a sanity check that is relied on by other i830_bios.c code. 511 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may 512 * feed an updated VBT back through that, compared to what we'll fetch using 513 * this method of groping around in the BIOS data. 514 * 515 * Returns 0 on success, nonzero on failure. 516 */ 517 int psb_intel_init_bios(struct drm_device *dev) 518 { 519 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 520 struct pci_dev *pdev = to_pci_dev(dev->dev); 521 struct vbt_header *vbt = NULL; 522 struct bdb_header *bdb = NULL; 523 u8 __iomem *bios = NULL; 524 size_t size; 525 int i; 526 527 528 dev_priv->panel_type = 0xff; 529 530 /* XXX Should this validation be moved to intel_opregion.c? */ 531 if (dev_priv->opregion.vbt) { 532 struct vbt_header *vbt = dev_priv->opregion.vbt; 533 if (memcmp(vbt->signature, "$VBT", 4) == 0) { 534 DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n", 535 vbt->signature); 536 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset); 537 } else 538 dev_priv->opregion.vbt = NULL; 539 } 540 541 if (bdb == NULL) { 542 bios = pci_map_rom(pdev, &size); 543 if (!bios) 544 return -1; 545 546 /* Scour memory looking for the VBT signature */ 547 for (i = 0; i + 4 < size; i++) { 548 if (!memcmp(bios + i, "$VBT", 4)) { 549 vbt = (struct vbt_header *)(bios + i); 550 break; 551 } 552 } 553 554 if (!vbt) { 555 dev_err(dev->dev, "VBT signature missing\n"); 556 pci_unmap_rom(pdev, bios); 557 return -1; 558 } 559 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset); 560 } 561 562 /* Grab useful general dxefinitions */ 563 parse_general_features(dev_priv, bdb); 564 parse_driver_features(dev_priv, bdb); 565 parse_lfp_panel_data(dev_priv, bdb); 566 parse_sdvo_panel_data(dev_priv, bdb); 567 parse_sdvo_device_mapping(dev_priv, bdb); 568 parse_device_mapping(dev_priv, bdb); 569 parse_backlight_data(dev_priv, bdb); 570 parse_edp(dev_priv, bdb); 571 572 if (bios) 573 pci_unmap_rom(pdev, bios); 574 575 return 0; 576 } 577 578 /* 579 * Destroy and free VBT data 580 */ 581 void psb_intel_destroy_bios(struct drm_device *dev) 582 { 583 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 584 585 kfree(dev_priv->sdvo_lvds_vbt_mode); 586 kfree(dev_priv->lfp_lvds_vbt_mode); 587 kfree(dev_priv->lvds_bl); 588 } 589