edid.c
1 /* SPDX-License-Identifier: MIT */ 2 3 /* this is a pretty robust parser for EDID, and we're tasked with parsing 4 * an arbitrary panel. We will pass it a raw EDID block and a struct which 5 * it must fill in with values. The set of values we need is pretty limited 6 * at present. 7 */ 8 9 #include <assert.h> 10 #include <commonlib/helpers.h> 11 #include <console/console.h> 12 #include <ctype.h> 13 #include <stdint.h> 14 #include <string.h> 15 #include <edid.h> 16 #include <vbe.h> 17 18 struct edid_context { 19 int claims_one_point_oh; 20 int claims_one_point_two; 21 int claims_one_point_three; 22 int claims_one_point_four; 23 int nonconformant_digital_display; 24 int nonconformant_extension; 25 int did_detailed_timing; 26 int has_name_descriptor; 27 int has_range_descriptor; 28 int has_preferred_timing; 29 int has_valid_checksum; 30 int has_valid_cvt; 31 int has_valid_dummy_block; 32 int has_valid_week; 33 int has_valid_year; 34 int has_valid_detailed_blocks; 35 int has_valid_extension_count; 36 int has_valid_descriptor_ordering; 37 int has_valid_descriptor_pad; 38 int has_valid_range_descriptor; 39 int has_valid_max_dotclock; 40 int has_valid_string_termination; 41 int manufacturer_name_well_formed; 42 int seen_non_detailed_descriptor; 43 int warning_excessive_dotclock_correction; 44 int warning_zero_preferred_refresh; 45 enum edid_status conformant; 46 }; 47 48 /* Stuff that isn't used anywhere but is nice to pretty-print while 49 we're decoding everything else. */ 50 static struct { 51 unsigned int model; 52 unsigned int serial; 53 unsigned int year; 54 unsigned int week; 55 unsigned int version[2]; 56 unsigned int nonconformant; 57 unsigned int type; 58 59 unsigned int x_mm; 60 unsigned int y_mm; 61 62 unsigned int voltage; 63 unsigned int sync; 64 65 const char *syncmethod; 66 const char *range_class; 67 const char *stereo; 68 } extra_info; 69 70 static struct edid tmp_edid; 71 72 static int manufacturer_name(unsigned char *x, char *output) 73 { 74 output[0] = ((x[0] & 0x7C) >> 2) + '@'; 75 output[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@'; 76 output[2] = (x[1] & 0x1F) + '@'; 77 output[3] = 0; 78 79 if (isupper(output[0]) && 80 isupper(output[1]) && 81 isupper(output[2])) 82 return 1; 83 84 memset(output, 0, 4); 85 return 0; 86 } 87 88 static int 89 detailed_cvt_descriptor(unsigned char *x, int first) 90 { 91 const unsigned char empty[3] = { 0, 0, 0 }; 92 static const char *names[] = { "50", "60", "75", "85" }; 93 int width = 0, height = 0; 94 int valid = 1; 95 int fifty = 0, sixty = 0, seventyfive = 0, eightyfive = 0, reduced = 0; 96 97 if (!first && !memcmp(x, empty, 3)) 98 return valid; 99 100 height = x[0]; 101 height |= (x[1] & 0xf0) << 4; 102 height++; 103 height *= 2; 104 105 switch (x[1] & 0x0c) { 106 case 0x00: 107 width = (height * 4) / 3; break; 108 case 0x04: 109 width = (height * 16) / 9; break; 110 case 0x08: 111 width = (height * 16) / 10; break; 112 case 0x0c: 113 width = (height * 15) / 9; break; 114 } 115 116 if (x[1] & 0x03) 117 valid = 0; 118 if (x[2] & 0x80) 119 valid = 0; 120 if (!(x[2] & 0x1f)) 121 valid = 0; 122 123 fifty = (x[2] & 0x10); 124 sixty = (x[2] & 0x08); 125 seventyfive = (x[2] & 0x04); 126 eightyfive = (x[2] & 0x02); 127 reduced = (x[2] & 0x01); 128 129 if (!valid) { 130 printk(BIOS_SPEW, " (broken)\n"); 131 } else { 132 printk(BIOS_SPEW, 133 " %dx%d @ (%s%s%s%s%s) Hz (%s%s preferred)\n", 134 width, height, 135 fifty ? "50 " : "", 136 sixty ? "60 " : "", 137 seventyfive ? "75 " : "", 138 eightyfive ? "85 " : "", 139 reduced ? "60RB " : "", 140 names[(x[2] & 0x60) >> 5], 141 (((x[2] & 0x60) == 0x20) && reduced) ? "RB" : ""); 142 } 143 144 return valid; 145 } 146 147 /* extract a CP437 string from a detailed subblock, checking for termination (if 148 * less than len of bytes) with LF and padded with SP. 149 */ 150 static char * 151 extract_string(unsigned char *x, int *valid_termination, int len) 152 { 153 static char ret[EDID_ASCII_STRING_LENGTH + 1]; 154 int i, seen_newline = 0; 155 156 memset(ret, 0, sizeof(ret)); 157 158 for (i = 0; i < MIN(len, EDID_ASCII_STRING_LENGTH); i++) { 159 if (seen_newline) { 160 if (x[i] != 0x20) { 161 *valid_termination = 0; 162 return ret; 163 } 164 } else if (x[i] == 0x0a) { 165 seen_newline = 1; 166 } else { 167 /* normal characters */ 168 ret[i] = x[i]; 169 } 170 } 171 172 return ret; 173 } 174 175 /* 1 means valid data */ 176 static int 177 detailed_block(struct edid *result_edid, unsigned char *x, int in_extension, 178 struct edid_context *c) 179 { 180 struct edid *out = &tmp_edid; 181 int i; 182 183 if (console_log_level(BIOS_SPEW)) { 184 printk(BIOS_SPEW, "Hex of detail: "); 185 for (i = 0; i < 18; i++) 186 printk(BIOS_SPEW, "%02x", x[i]); 187 printk(BIOS_SPEW, "\n"); 188 } 189 190 /* Result might already have some valid fields like mode_is_supported */ 191 *out = *result_edid; 192 193 if (x[0] == 0 && x[1] == 0) { 194 /* Monitor descriptor block, not detailed timing descriptor. */ 195 if (x[2] != 0) { 196 /* 1.3, 3.10.3 */ 197 printk(BIOS_SPEW, 198 "Monitor descriptor block has byte 2 nonzero (0x%02x)\n", 199 x[2]); 200 c->has_valid_descriptor_pad = 0; 201 } 202 if (x[3] != 0xfd && x[4] != 0x00) { 203 /* 1.3, 3.10.3 */ 204 printk(BIOS_SPEW, 205 "Monitor descriptor block has byte 4 nonzero (0x%02x)\n", 206 x[4]); 207 c->has_valid_descriptor_pad = 0; 208 } 209 210 c->seen_non_detailed_descriptor = 1; 211 if (x[3] <= 0xF) { 212 /* 213 * in principle we can decode these, if we know what 214 * they are. 215 * 0x0f seems to be common in laptop panels. 216 * 0x0e is used by EPI: http://www.epi-standard.org/ 217 */ 218 printk(BIOS_SPEW, 219 "Manufacturer-specified data, tag %d\n", x[3]); 220 return 1; 221 } 222 switch (x[3]) { 223 case 0x10: 224 printk(BIOS_SPEW, "Dummy block\n"); 225 for (i = 5; i < 18; i++) 226 if (x[i] != 0x00) 227 c->has_valid_dummy_block = 0; 228 return 1; 229 case 0xF7: 230 /* TODO */ 231 printk(BIOS_SPEW, "Established timings III\n"); 232 return 1; 233 case 0xF8: 234 { 235 int valid_cvt = 1; /* just this block */ 236 printk(BIOS_SPEW, "CVT 3-byte code descriptor:\n"); 237 if (x[5] != 0x01) { 238 c->has_valid_cvt = 0; 239 return 0; 240 } 241 for (i = 0; i < 4; i++) 242 valid_cvt &= detailed_cvt_descriptor(x + 6 243 + (i * 3), (i == 0)); 244 c->has_valid_cvt &= valid_cvt; 245 return 1; 246 } 247 case 0xF9: 248 /* TODO */ 249 printk(BIOS_SPEW, "Color management data\n"); 250 return 1; 251 case 0xFA: 252 /* TODO */ 253 printk(BIOS_SPEW, "More standard timings\n"); 254 return 1; 255 case 0xFB: 256 /* TODO */ 257 printk(BIOS_SPEW, "Color point\n"); 258 return 1; 259 case 0xFC: 260 printk(BIOS_SPEW, "Monitor name: %s\n", 261 extract_string(x + 5, 262 &c->has_valid_string_termination, 263 EDID_ASCII_STRING_LENGTH)); 264 c->has_name_descriptor = 1; 265 return 1; 266 case 0xFD: 267 { 268 int h_max_offset = 0, h_min_offset = 0; 269 int v_max_offset = 0, v_min_offset = 0; 270 int is_cvt = 0; 271 c->has_range_descriptor = 1; 272 extra_info.range_class = ""; 273 /* 274 * XXX todo: implement feature flags, vtd blocks 275 * XXX check: ranges are well-formed; block termination 276 * if no vtd 277 */ 278 if (c->claims_one_point_four) { 279 if (x[4] & 0x02) { 280 v_max_offset = 255; 281 if (x[4] & 0x01) 282 v_min_offset = 255; 283 } 284 if (x[4] & 0x04) { 285 h_max_offset = 255; 286 if (x[4] & 0x03) 287 h_min_offset = 255; 288 } 289 } else if (x[4]) { 290 c->has_valid_range_descriptor = 0; 291 } 292 293 /* 294 * despite the values, this is not a bitfield. 295 */ 296 switch (x[10]) { 297 case 0x00: /* default gtf */ 298 extra_info.range_class = "GTF"; 299 break; 300 case 0x01: /* range limits only */ 301 extra_info.range_class = "bare limits"; 302 if (!c->claims_one_point_four) 303 c->has_valid_range_descriptor = 0; 304 break; 305 case 0x02: /* secondary gtf curve */ 306 extra_info.range_class = "GTF with icing"; 307 break; 308 case 0x04: /* cvt */ 309 extra_info.range_class = "CVT"; 310 is_cvt = 1; 311 if (!c->claims_one_point_four) 312 c->has_valid_range_descriptor = 0; 313 break; 314 default: /* invalid */ 315 c->has_valid_range_descriptor = 0; 316 extra_info.range_class = "invalid"; 317 break; 318 } 319 320 if (x[5] + v_min_offset > x[6] + v_max_offset) 321 c->has_valid_range_descriptor = 0; 322 if (x[7] + h_min_offset > x[8] + h_max_offset) 323 c->has_valid_range_descriptor = 0; 324 printk(BIOS_SPEW, 325 "Monitor ranges (%s): %d-%dHz V, %d-%dkHz H", 326 extra_info.range_class, 327 x[5] + v_min_offset, x[6] + v_max_offset, 328 x[7] + h_min_offset, x[8] + h_max_offset); 329 if (x[9]) 330 printk(BIOS_SPEW, 331 ", max dotclock %dMHz\n", x[9] * 10); 332 else { 333 if (c->claims_one_point_four) 334 c->has_valid_max_dotclock = 0; 335 printk(BIOS_SPEW, "\n"); 336 } 337 338 if (is_cvt) { 339 int max_h_pixels = 0; 340 341 printk(BIOS_SPEW, "CVT version %d.%d\n", 342 x[11] & 0xf0 >> 4, x[11] & 0x0f); 343 344 if (x[12] & 0xfc) { 345 int raw_offset = (x[12] & 0xfc) >> 2; 346 printk(BIOS_SPEW, 347 "Real max dotclock: %dKHz\n", 348 (x[9] * 10000) 349 - (raw_offset * 250)); 350 if (raw_offset >= 40) 351 c->warning_excessive_dotclock_correction = 1; 352 } 353 354 max_h_pixels = x[12] & 0x03; 355 max_h_pixels <<= 8; 356 max_h_pixels |= x[13]; 357 max_h_pixels *= 8; 358 if (max_h_pixels) 359 printk(BIOS_SPEW, 360 "Max active pixels per line: %d\n", 361 max_h_pixels); 362 363 printk(BIOS_SPEW, 364 "Supported aspect ratios: %s %s %s %s %s\n", 365 x[14] & 0x80 ? "4:3" : "", 366 x[14] & 0x40 ? "16:9" : "", 367 x[14] & 0x20 ? "16:10" : "", 368 x[14] & 0x10 ? "5:4" : "", 369 x[14] & 0x08 ? "15:9" : ""); 370 if (x[14] & 0x07) 371 c->has_valid_range_descriptor = 0; 372 373 printk(BIOS_SPEW, "Preferred aspect ratio: "); 374 switch ((x[15] & 0xe0) >> 5) { 375 case 0x00: 376 printk(BIOS_SPEW, "4:3"); 377 break; 378 case 0x01: 379 printk(BIOS_SPEW, "16:9"); 380 break; 381 case 0x02: 382 printk(BIOS_SPEW, "16:10"); 383 break; 384 case 0x03: 385 printk(BIOS_SPEW, "5:4"); 386 break; 387 case 0x04: 388 printk(BIOS_SPEW, "15:9"); 389 break; 390 default: 391 printk(BIOS_SPEW, "(broken)"); 392 break; 393 } 394 printk(BIOS_SPEW, "\n"); 395 396 if (x[15] & 0x04) 397 printk(BIOS_SPEW, 398 "Supports CVT standard blanking\n"); 399 if (x[15] & 0x10) 400 printk(BIOS_SPEW, 401 "Supports CVT reduced blanking\n"); 402 403 if (x[15] & 0x07) 404 c->has_valid_range_descriptor = 0; 405 406 if (x[16] & 0xf0) { 407 printk(BIOS_SPEW, 408 "Supported display scaling:\n"); 409 if (x[16] & 0x80) 410 printk(BIOS_SPEW, 411 " Horizontal shrink\n"); 412 if (x[16] & 0x40) 413 printk(BIOS_SPEW, 414 " Horizontal stretch\n"); 415 if (x[16] & 0x20) 416 printk(BIOS_SPEW, 417 " Vertical shrink\n"); 418 if (x[16] & 0x10) 419 printk(BIOS_SPEW, 420 " Vertical stretch\n"); 421 } 422 423 if (x[16] & 0x0f) 424 c->has_valid_range_descriptor = 0; 425 426 if (x[17]) 427 printk(BIOS_SPEW, 428 "Preferred vertical refresh: %d Hz\n", 429 x[17]); 430 else 431 c->warning_zero_preferred_refresh = 1; 432 } 433 434 /* 435 * Slightly weird to return a global, but I've never 436 * seen any EDID block with two range descriptors, so 437 * it's harmless. 438 */ 439 return 1; 440 } 441 case 0xFE: 442 /* 443 * TODO: Two of these in a row, in the third and fourth 444 * slots, seems to be specified by SPWG: 445 * http://www.spwg.org/ 446 */ 447 strcpy(result_edid->ascii_string, extract_string(x + 5, 448 &c->has_valid_string_termination, 449 EDID_ASCII_STRING_LENGTH)); 450 printk(BIOS_SPEW, "ASCII string: %s\n", 451 result_edid->ascii_string); 452 return 1; 453 case 0xFF: 454 printk(BIOS_SPEW, "Serial number: %s\n", 455 extract_string(x + 5, 456 &c->has_valid_string_termination, 457 EDID_ASCII_STRING_LENGTH)); 458 return 1; 459 default: 460 printk(BIOS_SPEW, 461 "Unknown monitor description type %d\n", 462 x[3]); 463 return 0; 464 } 465 } 466 467 if (c->seen_non_detailed_descriptor && !in_extension) 468 c->has_valid_descriptor_ordering = 0; 469 470 /* Edid contains pixel clock in terms of 10KHz */ 471 out->mode.pixel_clock = (x[0] + (x[1] << 8)) * 10; 472 /* 473 LVDS supports following pixel clocks 474 25000...112000 kHz: single channel 475 80000...224000 kHz: dual channel 476 There is some overlap in theoretically supported 477 pixel clock between single-channel and dual-channel. 478 In practice with current panels all panels 479 <= 75200 kHz: single channel 480 >= 97750 kHz: dual channel 481 We have no samples between those values, so put a 482 threshold at 95000 kHz. If we get anything over 483 95000 kHz with single channel, we can make this 484 more sophisticated but it's currently not needed. 485 */ 486 out->mode.lvds_dual_channel = (out->mode.pixel_clock >= 95000); 487 extra_info.x_mm = (x[12] + ((x[14] & 0xF0) << 4)); 488 extra_info.y_mm = (x[13] + ((x[14] & 0x0F) << 8)); 489 out->mode.ha = (x[2] + ((x[4] & 0xF0) << 4)); 490 out->mode.hbl = (x[3] + ((x[4] & 0x0F) << 8)); 491 out->mode.hso = (x[8] + ((x[11] & 0xC0) << 2)); 492 out->mode.hspw = (x[9] + ((x[11] & 0x30) << 4)); 493 out->mode.hborder = x[15]; 494 out->mode.va = (x[5] + ((x[7] & 0xF0) << 4)); 495 out->mode.vbl = (x[6] + ((x[7] & 0x0F) << 8)); 496 out->mode.vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2)); 497 out->mode.vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4)); 498 out->mode.vborder = x[16]; 499 500 /* We assume rgb888 (32 bits per pixel) framebuffers by default. 501 * Chipsets that want something else will need to override this with 502 * another call to edid_set_framebuffer_bits_per_pixel(). As a cheap 503 * heuristic, assume that X86 systems require a 64-byte row alignment 504 * (since that seems to be true for most Intel chipsets). */ 505 if (ENV_X86) 506 edid_set_framebuffer_bits_per_pixel(out, 32, 64); 507 else 508 edid_set_framebuffer_bits_per_pixel(out, 32, 0); 509 510 switch ((x[17] & 0x18) >> 3) { 511 case 0x00: 512 extra_info.syncmethod = " analog composite"; 513 break; 514 case 0x01: 515 extra_info.syncmethod = " bipolar analog composite"; 516 break; 517 case 0x02: 518 extra_info.syncmethod = " digital composite"; 519 break; 520 case 0x03: 521 extra_info.syncmethod = ""; 522 break; 523 } 524 out->mode.pvsync = (x[17] & (1 << 2)) ? '+' : '-'; 525 out->mode.phsync = (x[17] & (1 << 1)) ? '+' : '-'; 526 switch (x[17] & 0x61) { 527 case 0x20: 528 extra_info.stereo = "field sequential L/R"; 529 break; 530 case 0x40: 531 extra_info.stereo = "field sequential R/L"; 532 break; 533 case 0x21: 534 extra_info.stereo = "interleaved right even"; 535 break; 536 case 0x41: 537 extra_info.stereo = "interleaved left even"; 538 break; 539 case 0x60: 540 extra_info.stereo = "four way interleaved"; 541 break; 542 case 0x61: 543 extra_info.stereo = "side by side interleaved"; 544 break; 545 default: 546 extra_info.stereo = ""; 547 break; 548 } 549 550 printk(BIOS_SPEW, 551 "Detailed mode (IN HEX): Clock %d KHz, %x mm x %x mm\n" 552 " %04x %04x %04x %04x hborder %x\n" 553 " %04x %04x %04x %04x vborder %x\n" 554 " %chsync %cvsync%s%s%s\n", 555 out->mode.pixel_clock, 556 extra_info.x_mm, 557 extra_info.y_mm, 558 out->mode.ha, out->mode.ha + out->mode.hso, 559 out->mode.ha + out->mode.hso + out->mode.hspw, 560 out->mode.ha + out->mode.hbl, out->mode.hborder, 561 out->mode.va, out->mode.va + out->mode.vso, 562 out->mode.va + out->mode.vso + out->mode.vspw, 563 out->mode.va + out->mode.vbl, out->mode.vborder, 564 out->mode.phsync, out->mode.pvsync, 565 extra_info.syncmethod, x[17] & 0x80 ? " interlaced" : "", 566 extra_info.stereo); 567 568 if (!c->did_detailed_timing) { 569 printk(BIOS_SPEW, "Did detailed timing\n"); 570 c->did_detailed_timing = 1; 571 *result_edid = *out; 572 } 573 574 return 1; 575 } 576 577 static int 578 do_checksum(unsigned char *x) 579 { 580 int valid = 0; 581 printk(BIOS_SPEW, "Checksum: 0x%hhx", x[0x7f]); 582 { 583 unsigned char sum = 0; 584 int i; 585 for (i = 0; i < 128; i++) 586 sum += x[i]; 587 if (sum) { 588 printk(BIOS_SPEW, " (should be 0x%hhx)", 589 (unsigned char)(x[0x7f] - sum)); 590 } else { 591 valid = 1; 592 printk(BIOS_SPEW, " (valid)"); 593 } 594 } 595 printk(BIOS_SPEW, "\n"); 596 return valid; 597 } 598 599 /* CEA extension */ 600 601 static const char * 602 audio_format(unsigned char x) 603 { 604 switch (x) { 605 case 0: return "RESERVED"; 606 case 1: return "Linear PCM"; 607 case 2: return "AC-3"; 608 case 3: return "MPEG 1 (Layers 1 & 2)"; 609 case 4: return "MPEG 1 Layer 3 (MP3)"; 610 case 5: return "MPEG2 (multichannel)"; 611 case 6: return "AAC"; 612 case 7: return "DTS"; 613 case 8: return "ATRAC"; 614 case 9: return "One Bit Audio"; 615 case 10: return "Dolby Digital+"; 616 case 11: return "DTS-HD"; 617 case 12: return "MAT (MLP)"; 618 case 13: return "DST"; 619 case 14: return "WMA Pro"; 620 case 15: return "RESERVED"; 621 } 622 return "BROKEN"; /* can't happen */ 623 } 624 625 static void 626 cea_audio_block(unsigned char *x) 627 { 628 int i, format; 629 int length = x[0] & 0x1f; 630 631 if (length % 3) { 632 printk(BIOS_SPEW, "Broken CEA audio block length %d\n", length); 633 /* XXX non-conformant */ 634 return; 635 } 636 637 for (i = 1; i < length; i += 3) { 638 format = (x[i] & 0x78) >> 3; 639 printk(BIOS_SPEW, " %s, max channels %d\n", 640 audio_format(format), x[i] & 0x07); 641 printk(BIOS_SPEW, 642 " Supported sample rates (kHz):%s%s%s%s%s%s%s\n", 643 (x[i+1] & 0x40) ? " 192" : "", 644 (x[i+1] & 0x20) ? " 176.4" : "", 645 (x[i+1] & 0x10) ? " 96" : "", 646 (x[i+1] & 0x08) ? " 88.2" : "", 647 (x[i+1] & 0x04) ? " 48" : "", 648 (x[i+1] & 0x02) ? " 44.1" : "", 649 (x[i+1] & 0x01) ? " 32" : ""); 650 if (format == 1) { 651 printk(BIOS_SPEW, 652 " Supported sample sizes (bits):%s%s%s\n", 653 (x[2] & 0x04) ? " 24" : "", 654 (x[2] & 0x02) ? " 20" : "", 655 (x[2] & 0x01) ? " 16" : ""); 656 } else if (format <= 8) { 657 printk(BIOS_SPEW, 658 " Maximum bit rate: %d kHz\n", x[2] * 8); 659 } 660 } 661 } 662 663 static void 664 cea_video_block(unsigned char *x) 665 { 666 int i; 667 int length = x[0] & 0x1f; 668 669 for (i = 1; i < length; i++) 670 printk(BIOS_SPEW, " VIC %02d %s\n", x[i] & 0x7f, 671 x[i] & 0x80 ? "(native)" : ""); 672 } 673 674 static void 675 cea_hdmi_block(struct edid *out, unsigned char *x) 676 { 677 int length = x[0] & 0x1f; 678 679 out->hdmi_monitor_detected = 1; 680 681 printk(BIOS_SPEW, " (HDMI)\n"); 682 printk(BIOS_SPEW, 683 " Source physical address %d.%d.%d.%d\n", 684 x[4] >> 4, x[4] & 0x0f, x[5] >> 4, x[5] & 0x0f); 685 686 if (length > 5) { 687 if (x[6] & 0x80) 688 printk(BIOS_SPEW, " Supports_AI\n"); 689 if (x[6] & 0x40) 690 printk(BIOS_SPEW, " DC_48bit\n"); 691 if (x[6] & 0x20) 692 printk(BIOS_SPEW, " DC_36bit\n"); 693 if (x[6] & 0x10) 694 printk(BIOS_SPEW, " DC_30bit\n"); 695 if (x[6] & 0x08) 696 printk(BIOS_SPEW, " DC_Y444\n"); 697 /* two reserved */ 698 if (x[6] & 0x01) 699 printk(BIOS_SPEW, " DVI_Dual\n"); 700 } 701 702 if (length > 6) 703 printk(BIOS_SPEW, " Maximum TMDS clock: %dMHz\n", x[7] * 5); 704 705 /* XXX the walk here is really ugly, and needs to be length-checked */ 706 if (length > 7) { 707 int b = 0; 708 709 if (x[8] & 0x80) { 710 printk(BIOS_SPEW, " Video latency: %d\n", x[9 + b]); 711 printk(BIOS_SPEW, " Audio latency: %d\n", x[10 + b]); 712 b += 2; 713 } 714 715 if (x[8] & 0x40) { 716 printk(BIOS_SPEW, 717 " Interlaced video latency: %d\n", x[9 + b]); 718 printk(BIOS_SPEW, 719 " Interlaced audio latency: %d\n", 720 x[10 + b]); 721 b += 2; 722 } 723 724 if (x[8] & 0x20) { 725 int mask = 0, formats = 0; 726 int len_xx, len_3d; 727 printk(BIOS_SPEW, " Extended HDMI video details:\n"); 728 if (x[9 + b] & 0x80) 729 printk(BIOS_SPEW, " 3D present\n"); 730 if ((x[9 + b] & 0x60) == 0x20) { 731 printk(BIOS_SPEW, 732 " All advertised VICs are 3D-capable\n"); 733 formats = 1; 734 } 735 if ((x[9 + b] & 0x60) == 0x40) { 736 printk(BIOS_SPEW, 737 " 3D-capable-VIC mask present\n"); 738 formats = 1; 739 mask = 1; 740 } 741 switch (x[9 + b] & 0x18) { 742 case 0x00: 743 break; 744 case 0x08: 745 printk(BIOS_SPEW, " Base EDID image size is aspect ratio\n"); 746 break; 747 case 0x10: 748 printk(BIOS_SPEW, " Base EDID image size is in units of 1cm\n"); 749 break; 750 case 0x18: 751 printk(BIOS_SPEW, " Base EDID image size is in units of 5cm\n"); 752 break; 753 } 754 len_xx = (x[10 + b] & 0xe0) >> 5; 755 len_3d = (x[10 + b] & 0x1f) >> 0; 756 b += 2; 757 758 if (len_xx) { 759 printk(BIOS_SPEW, " Skipping %d bytes that HDMI refuses to publicly" 760 " document\n", len_xx); 761 b += len_xx; 762 } 763 764 if (len_3d) { 765 if (formats) { 766 if (x[9 + b] & 0x01) 767 printk(BIOS_SPEW, " Side-by-side 3D supported\n"); 768 if (x[10 + b] & 0x40) 769 printk(BIOS_SPEW, " Top-and-bottom 3D supported\n"); 770 if (x[10 + b] & 0x01) 771 printk(BIOS_SPEW, " Frame-packing 3D supported\n"); 772 b += 2; 773 } 774 if (mask) { 775 int i; 776 printk(BIOS_SPEW, 777 " 3D VIC indices:"); 778 /* worst bit ordering ever */ 779 for (i = 0; i < 8; i++) 780 if (x[10 + b] & (1 << i)) 781 printk(BIOS_SPEW, 782 " %d", i); 783 for (i = 0; i < 8; i++) 784 if (x[9 + b] & (1 << i)) 785 printk(BIOS_SPEW, 786 " %d", i + 8); 787 printk(BIOS_SPEW, "\n"); 788 b += 2; 789 } 790 791 /* 792 * XXX list of nibbles: 793 * 2D_VIC_Order_X 794 * 3D_Structure_X 795 * (optionally: 3D_Detail_X and reserved) 796 */ 797 } 798 } 799 /* Tell static analysis we know index b is left unused. */ 800 (void)b; 801 } 802 } 803 804 static void 805 cea_block(struct edid *out, unsigned char *x) 806 { 807 unsigned int oui; 808 809 switch ((x[0] & 0xe0) >> 5) { 810 case 0x01: 811 printk(BIOS_SPEW, " Audio data block\n"); 812 cea_audio_block(x); 813 break; 814 case 0x02: 815 printk(BIOS_SPEW, " Video data block\n"); 816 cea_video_block(x); 817 break; 818 case 0x03: 819 /* yes really, endianness lols */ 820 oui = (x[3] << 16) + (x[2] << 8) + x[1]; 821 printk(BIOS_SPEW, " Vendor-specific data block, OUI %06x", 822 oui); 823 if (oui == 0x000c03) 824 cea_hdmi_block(out, x); 825 else 826 printk(BIOS_SPEW, "\n"); 827 break; 828 case 0x04: 829 printk(BIOS_SPEW, " Speaker allocation data block\n"); 830 break; 831 case 0x05: 832 printk(BIOS_SPEW, " VESA DTC data block\n"); 833 break; 834 case 0x07: 835 printk(BIOS_SPEW, " Extended tag: "); 836 switch (x[1]) { 837 case 0x00: 838 printk(BIOS_SPEW, "video capability data block\n"); 839 break; 840 case 0x01: 841 printk(BIOS_SPEW, "vendor-specific video data block\n"); 842 break; 843 case 0x02: 844 printk(BIOS_SPEW, 845 "VESA video display device information data block\n"); 846 break; 847 case 0x03: 848 printk(BIOS_SPEW, "VESA video data block\n"); 849 break; 850 case 0x04: 851 printk(BIOS_SPEW, "HDMI video data block\n"); 852 break; 853 case 0x05: 854 printk(BIOS_SPEW, "Colorimetry data block\n"); 855 break; 856 case 0x10: 857 printk(BIOS_SPEW, "CEA miscellaneous audio fields\n"); 858 break; 859 case 0x11: 860 printk(BIOS_SPEW, "Vendor-specific audio data block\n"); 861 break; 862 case 0x12: 863 printk(BIOS_SPEW, "HDMI audio data block\n"); 864 break; 865 default: 866 if (x[1] >= 6 && x[1] <= 15) 867 printk(BIOS_SPEW, 868 "Reserved video block (%02x)\n", x[1]); 869 else if (x[1] >= 19 && x[1] <= 31) 870 printk(BIOS_SPEW, 871 "Reserved audio block (%02x)\n", x[1]); 872 else 873 printk(BIOS_SPEW, "Unknown (%02x)\n", x[1]); 874 break; 875 } 876 break; 877 default: 878 { 879 int tag = (*x & 0xe0) >> 5; 880 int length = *x & 0x1f; 881 printk(BIOS_SPEW, 882 " Unknown tag %d, length %d (raw %02x)\n", 883 tag, length, *x); 884 break; 885 } 886 } 887 } 888 889 static int 890 parse_cea(struct edid *out, unsigned char *x, struct edid_context *c) 891 { 892 int ret = 0; 893 int version = x[1]; 894 int offset = x[2]; 895 unsigned char *detailed; 896 897 if (version >= 1) 898 do { 899 if (version == 1 && x[3] != 0) 900 ret = 1; 901 902 if (offset < 4) 903 break; 904 905 if (version < 3) 906 printk(BIOS_SPEW, 907 "%d 8-byte timing descriptors\n", 908 (offset - 4) / 8); 909 else if (version == 3) { 910 int i; 911 printk(BIOS_SPEW, 912 "%d bytes of CEA data\n", offset - 4); 913 for (i = 4; i < offset; i += (x[i] & 0x1f) + 1) 914 cea_block(out, x + i); 915 } 916 917 if (version >= 2) { 918 if (x[3] & 0x80) 919 printk(BIOS_SPEW, 920 "Underscans PC formats by default\n"); 921 if (x[3] & 0x40) 922 printk(BIOS_SPEW, 923 "Basic audio support\n"); 924 if (x[3] & 0x20) 925 printk(BIOS_SPEW, 926 "Supports YCbCr 4:4:4\n"); 927 if (x[3] & 0x10) 928 printk(BIOS_SPEW, 929 "Supports YCbCr 4:2:2\n"); 930 printk(BIOS_SPEW, 931 "%d native detailed modes\n", 932 x[3] & 0x0f); 933 } 934 935 for (detailed = x + offset; detailed + 18 < x + 127; 936 detailed += 18) 937 if (detailed[0]) 938 detailed_block(out, detailed, 1, c); 939 } while (0); 940 941 c->has_valid_checksum &= do_checksum(x); 942 return ret; 943 } 944 945 /* generic extension code */ 946 947 static void 948 extension_version(struct edid *out, unsigned char *x) 949 { 950 printk(BIOS_SPEW, "Extension version: %d\n", x[1]); 951 } 952 953 static int 954 parse_extension(struct edid *out, unsigned char *x, struct edid_context *c) 955 { 956 int conformant_extension = 0; 957 printk(BIOS_SPEW, "\n"); 958 959 switch (x[0]) { 960 case 0x02: 961 printk(BIOS_SPEW, "CEA extension block\n"); 962 extension_version(out, x); 963 conformant_extension = parse_cea(out, x, c); 964 break; 965 case 0x10: 966 printk(BIOS_SPEW, "VTB extension block\n"); 967 break; 968 case 0x40: 969 printk(BIOS_SPEW, "DI extension block\n"); 970 break; 971 case 0x50: 972 printk(BIOS_SPEW, "LS extension block\n"); 973 break; 974 case 0x60: 975 printk(BIOS_SPEW, "DPVL extension block\n"); 976 break; 977 case 0xF0: 978 printk(BIOS_SPEW, "Block map\n"); 979 break; 980 case 0xFF: 981 printk(BIOS_SPEW, "Manufacturer-specific extension block\n"); 982 break; 983 default: 984 printk(BIOS_SPEW, "Unknown extension block\n"); 985 break; 986 } 987 988 printk(BIOS_SPEW, "\n"); 989 990 return conformant_extension; 991 } 992 993 static const struct { 994 int x, y, refresh; 995 } established_timings[] = { 996 /* 0x23 bit 7 - 0 */ 997 {720, 400, 70}, 998 {720, 400, 88}, 999 {640, 480, 60}, 1000 {640, 480, 67}, 1001 {640, 480, 72}, 1002 {640, 480, 75}, 1003 {800, 600, 56}, 1004 {800, 600, 60}, 1005 /* 0x24 bit 7 - 0 */ 1006 {800, 600, 72}, 1007 {800, 600, 75}, 1008 {832, 624, 75}, 1009 {1280, 768, 87}, 1010 {1024, 768, 60}, 1011 {1024, 768, 70}, 1012 {1024, 768, 75}, 1013 {1280, 1024, 75}, 1014 /* 0x25 bit 7*/ 1015 {1152, 870, 75}, 1016 }; 1017 1018 static void print_subsection(const char *name, unsigned char *edid, int start, 1019 int end) 1020 { 1021 int i; 1022 1023 printk(BIOS_SPEW, "%s:", name); 1024 for (i = strlen(name); i < 15; i++) 1025 printk(BIOS_SPEW, " "); 1026 for (i = start; i <= end; i++) 1027 printk(BIOS_SPEW, " %02x", edid[i]); 1028 printk(BIOS_SPEW, "\n"); 1029 } 1030 1031 static void dump_breakdown(unsigned char *edid) 1032 { 1033 printk(BIOS_SPEW, "Extracted contents:\n"); 1034 print_subsection("header", edid, 0, 7); 1035 print_subsection("serial number", edid, 8, 17); 1036 print_subsection("version", edid, 18, 19); 1037 print_subsection("basic params", edid, 20, 24); 1038 print_subsection("chroma info", edid, 25, 34); 1039 print_subsection("established", edid, 35, 37); 1040 print_subsection("standard", edid, 38, 53); 1041 print_subsection("descriptor 1", edid, 54, 71); 1042 print_subsection("descriptor 2", edid, 72, 89); 1043 print_subsection("descriptor 3", edid, 90, 107); 1044 print_subsection("descriptor 4", edid, 108, 125); 1045 print_subsection("extensions", edid, 126, 126); 1046 print_subsection("checksum", edid, 127, 127); 1047 printk(BIOS_SPEW, "\n"); 1048 } 1049 1050 /* 1051 * Lookup table of some well-known modes that can be useful in case the 1052 * auto-detected mode is unsuitable. 1053 * ha = hdisplay; va = vdisplay; 1054 * hbl = htotal - hdisplay; vbl = vtotal - vdisplay; 1055 * hso = hsync_start - hdsiplay; vso = vsync_start - vdisplay; 1056 * hspw = hsync_end - hsync_start; vspw = vsync_end - vsync_start; 1057 */ 1058 static struct edid_mode known_modes[NUM_KNOWN_MODES] = { 1059 [EDID_MODE_640x480_60Hz] = { 1060 .name = "640x480@60Hz", .pixel_clock = 25200, .refresh = 60, 1061 .ha = 640, .hbl = 160, .hso = 16, .hspw = 96, 1062 .va = 480, .vbl = 45, .vso = 10, .vspw = 2, 1063 .phsync = '-', .pvsync = '-' }, 1064 [EDID_MODE_720x480_60Hz] = { 1065 .name = "720x480@60Hz", .pixel_clock = 27000, .refresh = 60, 1066 .ha = 720, .hbl = 138, .hso = 16, .hspw = 62, 1067 .va = 480, .vbl = 45, .vso = 9, .vspw = 6, 1068 .phsync = '-', .pvsync = '-' }, 1069 [EDID_MODE_1280x720_60Hz] = { 1070 .name = "1280x720@60Hz", .pixel_clock = 74250, .refresh = 60, 1071 .ha = 1280, .hbl = 370, .hso = 110, .hspw = 40, 1072 .va = 720, .vbl = 30, .vso = 5, .vspw = 20, 1073 .phsync = '+', .pvsync = '+' }, 1074 [EDID_MODE_1920x1080_60Hz] = { 1075 .name = "1920x1080@60Hz", .pixel_clock = 148500, .refresh = 60, 1076 .ha = 1920, .hbl = 280, .hso = 88, .hspw = 44, 1077 .va = 1080, .vbl = 45, .vso = 4, .vspw = 5, 1078 .phsync = '+', .pvsync = '+' }, 1079 }; 1080 1081 int set_display_mode(struct edid *edid, enum edid_modes mode) 1082 { 1083 if (mode == EDID_MODE_AUTO) 1084 return 0; 1085 1086 if (edid->mode_is_supported[mode]) { 1087 printk(BIOS_DEBUG, "Forcing mode %s\n", known_modes[mode].name); 1088 edid->mode = known_modes[mode]; 1089 return 0; 1090 } 1091 1092 printk(BIOS_ERR, "Requested display mode not supported.\n"); 1093 return -1; 1094 } 1095 1096 /* 1097 * Given a raw edid block, decode it into a form 1098 * that other parts of coreboot can use -- mainly 1099 * graphics bringup functions. The raw block is 1100 * required to be 128 bytes long, per the standard, 1101 * but we have no way of checking this minimum length. 1102 * We accept what we are given. 1103 */ 1104 int decode_edid(unsigned char *edid, int size, struct edid *out) 1105 { 1106 int analog, i, j; 1107 struct edid_context c = { 1108 .has_valid_cvt = 1, 1109 .has_valid_dummy_block = 1, 1110 .has_valid_descriptor_ordering = 1, 1111 .has_valid_detailed_blocks = 1, 1112 .has_valid_descriptor_pad = 1, 1113 .has_valid_range_descriptor = 1, 1114 .has_valid_max_dotclock = 1, 1115 .has_valid_string_termination = 1, 1116 .conformant = EDID_CONFORMANT, 1117 }; 1118 1119 if (!edid) { 1120 printk(BIOS_ERR, "No EDID found\n"); 1121 return EDID_ABSENT; 1122 } 1123 1124 dump_breakdown(edid); 1125 1126 if (memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) { 1127 printk(BIOS_ERR, "No header found\n"); 1128 return EDID_ABSENT; 1129 } 1130 1131 memset(out, 0, sizeof(*out)); 1132 1133 if (manufacturer_name(edid + 0x08, out->manufacturer_name)) 1134 c.manufacturer_name_well_formed = 1; 1135 1136 extra_info.model = (unsigned short)(edid[0x0A] + (edid[0x0B] << 8)); 1137 extra_info.serial = (unsigned int)(edid[0x0C] + (edid[0x0D] << 8) 1138 + (edid[0x0E] << 16) + (edid[0x0F] << 24)); 1139 1140 printk(BIOS_SPEW, "Manufacturer: %s Model %x Serial Number %u\n", 1141 out->manufacturer_name, 1142 (unsigned short)(edid[0x0A] + (edid[0x0B] << 8)), 1143 (unsigned int)(edid[0x0C] + (edid[0x0D] << 8) 1144 + (edid[0x0E] << 16) + (edid[0x0F] << 24))); 1145 /* XXX need manufacturer ID table */ 1146 1147 if (edid[0x10] < 55 || edid[0x10] == 0xff) { 1148 c.has_valid_week = 1; 1149 if (edid[0x11] > 0x0f) { 1150 if (edid[0x10] == 0xff) { 1151 c.has_valid_year = 1; 1152 printk(BIOS_SPEW, 1153 "Made week %hhd of model year %hhd\n", 1154 edid[0x10], edid[0x11]); 1155 extra_info.week = edid[0x10]; 1156 extra_info.year = edid[0x11]; 1157 } else { 1158 /* we know it's at least 2013, when this code 1159 * was written 1160 */ 1161 if (edid[0x11] + 90 <= 2013) { 1162 c.has_valid_year = 1; 1163 printk(BIOS_SPEW, 1164 "Made week %hhd of %d\n", 1165 edid[0x10], edid[0x11] + 1990); 1166 extra_info.week = edid[0x10]; 1167 extra_info.year = edid[0x11] + 1990; 1168 } 1169 } 1170 } 1171 } 1172 1173 printk(BIOS_SPEW, "EDID version: %hhd.%hhd\n", edid[0x12], edid[0x13]); 1174 extra_info.version[0] = edid[0x12]; 1175 extra_info.version[1] = edid[0x13]; 1176 1177 if (edid[0x12] == 1) { 1178 if (edid[0x13] > 4) { 1179 printk(BIOS_SPEW, 1180 "Claims > 1.4, assuming 1.4 conformance\n"); 1181 edid[0x13] = 4; 1182 } 1183 switch (edid[0x13]) { 1184 case 4: 1185 c.claims_one_point_four = 1; 1186 __fallthrough; 1187 case 3: 1188 c.claims_one_point_three = 1; 1189 __fallthrough; 1190 case 2: 1191 c.claims_one_point_two = 1; 1192 __fallthrough; 1193 default: 1194 c.claims_one_point_oh = 1; 1195 } 1196 } 1197 1198 /* display section */ 1199 if (edid[0x14] & 0x80) { 1200 int conformance_mask; 1201 analog = 0; 1202 printk(BIOS_SPEW, "Digital display\n"); 1203 if (c.claims_one_point_four) { 1204 conformance_mask = 0; 1205 if ((edid[0x14] & 0x70) == 0x00) 1206 printk(BIOS_SPEW, "Color depth is undefined\n"); 1207 else if ((edid[0x14] & 0x70) == 0x70) 1208 c.nonconformant_digital_display = 1; 1209 else 1210 printk(BIOS_SPEW, 1211 "%d bits per primary color channel\n", 1212 ((edid[0x14] & 0x70) >> 3) + 4); 1213 out->panel_bits_per_color = ((edid[0x14] & 0x70) >> 3) 1214 + 4; 1215 out->panel_bits_per_pixel = 3*out->panel_bits_per_color; 1216 1217 switch (edid[0x14] & 0x0f) { 1218 case 0x00: 1219 printk(BIOS_SPEW, 1220 "Digital interface is not defined\n"); 1221 break; 1222 case 0x01: 1223 printk(BIOS_SPEW, "DVI interface\n"); 1224 break; 1225 case 0x02: 1226 printk(BIOS_SPEW, "HDMI-a interface\n"); 1227 break; 1228 case 0x03: 1229 printk(BIOS_SPEW, "HDMI-b interface\n"); 1230 break; 1231 case 0x04: 1232 printk(BIOS_SPEW, "MDDI interface\n"); 1233 break; 1234 case 0x05: 1235 printk(BIOS_SPEW, "DisplayPort interface\n"); 1236 break; 1237 default: 1238 c.nonconformant_digital_display = 1; 1239 break; 1240 } 1241 extra_info.type = edid[0x14] & 0x0f; 1242 } else if (c.claims_one_point_two) { 1243 conformance_mask = 0x7E; 1244 if (edid[0x14] & 0x01) 1245 printk(BIOS_SPEW, "DFP 1.x compatible TMDS\n"); 1246 } else 1247 conformance_mask = 0x7F; 1248 1249 if (!c.nonconformant_digital_display) 1250 c.nonconformant_digital_display = edid[0x14] 1251 & conformance_mask; 1252 extra_info.nonconformant = c.nonconformant_digital_display; 1253 } else { 1254 analog = 1; 1255 int voltage = (edid[0x14] & 0x60) >> 5; 1256 int sync = (edid[0x14] & 0x0F); 1257 extra_info.voltage = voltage; 1258 extra_info.sync = sync; 1259 1260 printk(BIOS_SPEW, "Analog display, Input voltage level: %s V\n", 1261 voltage == 3 ? "0.7/0.7" : 1262 voltage == 2 ? "1.0/0.4" : 1263 voltage == 1 ? "0.714/0.286" : 1264 "0.7/0.3"); 1265 1266 if (c.claims_one_point_four) { 1267 if (edid[0x14] & 0x10) 1268 printk(BIOS_SPEW, 1269 "Blank-to-black setup/pedestal\n"); 1270 else 1271 printk(BIOS_SPEW, 1272 "Blank level equals black level\n"); 1273 } else if (edid[0x14] & 0x10) { 1274 /* 1275 * XXX this is just the X text. 1.3 says "if set, 1276 * display expects a blank-to-black setup or pedestal 1277 * per appropriate Signal Level Standard". Whatever 1278 * _that_ means. 1279 */ 1280 printk(BIOS_SPEW, "Configurable signal levels\n"); 1281 } 1282 1283 printk(BIOS_SPEW, "Sync: %s%s%s%s\n", 1284 sync & 0x08 ? "Separate " : "", 1285 sync & 0x04 ? "Composite " : "", 1286 sync & 0x02 ? "SyncOnGreen " : "", 1287 sync & 0x01 ? "Serration " : ""); 1288 } 1289 1290 1291 if (edid[0x15] && edid[0x16]) { 1292 printk(BIOS_SPEW, "Maximum image size: %d cm x %d cm\n", 1293 edid[0x15], edid[0x16]); 1294 } else if (c.claims_one_point_four && (edid[0x15] || edid[0x16])) { 1295 if (edid[0x15]) { /* edid[0x15] != 0 && edid[0x16] == 0 */ 1296 unsigned int ratio = 100000/(edid[0x15] + 99); 1297 printk(BIOS_SPEW, 1298 "Aspect ratio is %u.%03u (landscape)\n", 1299 ratio / 1000, ratio % 1000); 1300 } else { /* edid[0x15] == 0 && edid[0x16] != 0 */ 1301 unsigned int ratio = 100000/(edid[0x16] + 99); 1302 printk(BIOS_SPEW, 1303 "Aspect ratio is %u.%03u (portrait)\n", 1304 ratio / 1000, ratio % 1000); 1305 } 1306 } else { 1307 /* Either or both can be zero for 1.3 and before */ 1308 printk(BIOS_SPEW, "Image size is variable\n"); 1309 } 1310 1311 if (edid[0x17] == 0xff) { 1312 if (c.claims_one_point_four) 1313 printk(BIOS_SPEW, 1314 "Gamma is defined in an extension block\n"); 1315 else 1316 /* XXX Technically 1.3 doesn't say this... */ 1317 printk(BIOS_SPEW, "Gamma: 1.0\n"); 1318 } else 1319 printk(BIOS_SPEW, "Gamma: %d%%\n", ((edid[0x17] + 100))); 1320 printk(BIOS_SPEW, "Check DPMS levels\n"); 1321 if (edid[0x18] & 0xE0) { 1322 printk(BIOS_SPEW, "DPMS levels:"); 1323 if (edid[0x18] & 0x80) 1324 printk(BIOS_SPEW, " Standby"); 1325 if (edid[0x18] & 0x40) 1326 printk(BIOS_SPEW, " Suspend"); 1327 if (edid[0x18] & 0x20) 1328 printk(BIOS_SPEW, " Off"); 1329 printk(BIOS_SPEW, "\n"); 1330 } 1331 1332 /* FIXME: this is from 1.4 spec, check earlier */ 1333 if (analog) { 1334 switch (edid[0x18] & 0x18) { 1335 case 0x00: 1336 printk(BIOS_SPEW, "Monochrome or grayscale display\n"); 1337 break; 1338 case 0x08: 1339 printk(BIOS_SPEW, "RGB color display\n"); 1340 break; 1341 case 0x10: 1342 printk(BIOS_SPEW, "Non-RGB color display\n"); 1343 break; 1344 case 0x18: 1345 printk(BIOS_SPEW, "Undefined display color type\n"); 1346 break; 1347 } 1348 } else { 1349 printk(BIOS_SPEW, "Supported color formats: RGB 4:4:4"); 1350 if (edid[0x18] & 0x10) 1351 printk(BIOS_SPEW, ", YCrCb 4:4:4"); 1352 if (edid[0x18] & 0x08) 1353 printk(BIOS_SPEW, ", YCrCb 4:2:2"); 1354 printk(BIOS_SPEW, "\n"); 1355 } 1356 1357 if (edid[0x18] & 0x04) 1358 printk(BIOS_SPEW, 1359 "Default (sRGB) color space is primary color space\n"); 1360 if (edid[0x18] & 0x02) { 1361 printk(BIOS_SPEW, 1362 "First detailed timing is preferred timing\n"); 1363 c.has_preferred_timing = 1; 1364 } 1365 if (edid[0x18] & 0x01) 1366 printk(BIOS_SPEW, 1367 "Supports GTF timings within operating range\n"); 1368 1369 /* XXX color section */ 1370 1371 printk(BIOS_SPEW, "Established timings supported:\n"); 1372 /* it's not yet clear we want all this stuff in the edid struct. 1373 * Let's wait. 1374 */ 1375 for (i = 0; i < 17; i++) { 1376 if (edid[0x23 + i / 8] & (1 << (7 - i % 8))) { 1377 printk(BIOS_SPEW, " %dx%d@%dHz\n", 1378 established_timings[i].x, 1379 established_timings[i].y, 1380 established_timings[i].refresh); 1381 1382 for (j = 0; j < NUM_KNOWN_MODES; j++) { 1383 if (known_modes[j].ha == 1384 established_timings[i].x 1385 && known_modes[j].va == 1386 established_timings[i].y 1387 && known_modes[j].refresh == 1388 established_timings[i].refresh) 1389 out->mode_is_supported[j] = 1; 1390 } 1391 } 1392 } 1393 1394 printk(BIOS_SPEW, "Standard timings supported:\n"); 1395 for (i = 0; i < 8; i++) { 1396 uint8_t b1 = edid[0x26 + i * 2], b2 = edid[0x26 + i * 2 + 1]; 1397 unsigned int x, y = 0, refresh; 1398 1399 if (b1 == 0x01 && b2 == 0x01) 1400 continue; 1401 1402 if (b1 == 0) { 1403 printk(BIOS_SPEW, 1404 "non-conformant standard timing (0 horiz)\n"); 1405 continue; 1406 } 1407 x = (b1 + 31) * 8; 1408 switch ((b2 >> 6) & 0x3) { 1409 case 0x00: 1410 if (c.claims_one_point_three) 1411 y = x * 10 / 16; 1412 else 1413 y = x; 1414 break; 1415 case 0x01: 1416 y = x * 3 / 4; 1417 break; 1418 case 0x02: 1419 y = x * 4 / 5; 1420 break; 1421 case 0x03: 1422 y = x * 9 / 16; 1423 break; 1424 } 1425 refresh = 60 + (b2 & 0x3f); 1426 1427 printk(BIOS_SPEW, " %dx%d@%dHz\n", x, y, refresh); 1428 for (j = 0; j < NUM_KNOWN_MODES; j++) { 1429 if (known_modes[j].ha == x && known_modes[j].va == y && 1430 known_modes[j].refresh == refresh) 1431 out->mode_is_supported[j] = 1; 1432 } 1433 } 1434 1435 /* detailed timings */ 1436 printk(BIOS_SPEW, "Detailed timings\n"); 1437 for (i = 0; i < 4; i++) { 1438 c.has_valid_detailed_blocks &= detailed_block( 1439 out, edid + 0x36 + i * 18, 0, &c); 1440 if (i == 0 && c.has_preferred_timing 1441 && !c.did_detailed_timing) { 1442 /* not really accurate... */ 1443 c.has_preferred_timing = 0; 1444 } 1445 } 1446 1447 /* check this, 1.4 verification guide says otherwise */ 1448 if (edid[0x7e]) { 1449 printk(BIOS_SPEW, "Has %d extension blocks\n", edid[0x7e]); 1450 /* 2 is impossible because of the block map */ 1451 if (edid[0x7e] != 2) 1452 c.has_valid_extension_count = 1; 1453 } else { 1454 c.has_valid_extension_count = 1; 1455 } 1456 1457 printk(BIOS_SPEW, "Checksum\n"); 1458 c.has_valid_checksum = do_checksum(edid); 1459 1460 /* EDID v2.0 has a larger blob (256 bytes) and may have some problem in 1461 * the extension parsing loop below. Since v2.0 was quickly deprecated 1462 * by v1.3 and we are unlikely to use any EDID 2.0 panels, we ignore 1463 * that case now and can fix it when we need to use a real 2.0 panel. 1464 */ 1465 for (i = 128; i < size; i += 128) 1466 c.nonconformant_extension += 1467 parse_extension(out, &edid[i], &c); 1468 1469 if (c.claims_one_point_four) { 1470 if (c.nonconformant_digital_display || 1471 !c.has_valid_string_termination || 1472 !c.has_valid_descriptor_pad || 1473 !c.has_preferred_timing) { 1474 c.conformant = EDID_NOT_CONFORMANT; 1475 printk(BIOS_ERR, 1476 "EDID block does NOT conform to EDID 1.4!\n"); 1477 } 1478 1479 if (c.nonconformant_digital_display) 1480 printk(BIOS_ERR, 1481 "\tDigital display field contains garbage: %x\n", 1482 c.nonconformant_digital_display); 1483 if (!c.has_valid_string_termination) 1484 printk(BIOS_ERR, 1485 "\tDetailed block string not properly terminated\n"); 1486 if (!c.has_valid_descriptor_pad) 1487 printk(BIOS_ERR, 1488 "\tInvalid descriptor block padding\n"); 1489 if (!c.has_preferred_timing) 1490 printk(BIOS_ERR, "\tMissing preferred timing\n"); 1491 } else if (c.claims_one_point_three) { 1492 if (c.nonconformant_digital_display || 1493 !c.has_valid_string_termination || 1494 !c.has_valid_descriptor_pad || 1495 !c.has_preferred_timing) { 1496 c.conformant = EDID_NOT_CONFORMANT; 1497 } 1498 /** 1499 * According to E-EDID (EDIDv1.3), has_name_descriptor and 1500 * has_range_descriptor are both required. These fields are 1501 * optional in v1.4. However some v1.3 panels (Ex, B133XTN01.3) 1502 * don't have them. As a workaround, we only print warning 1503 * messages. 1504 */ 1505 if (c.conformant == EDID_NOT_CONFORMANT) 1506 printk(BIOS_ERR, 1507 "EDID block does NOT conform to EDID 1.3!\n"); 1508 else if (!c.has_name_descriptor || !c.has_range_descriptor) 1509 printk(BIOS_WARNING, "EDID block does NOT " 1510 "fully conform to EDID 1.3.\n"); 1511 1512 if (c.nonconformant_digital_display) 1513 printk(BIOS_ERR, 1514 "\tDigital display field contains garbage: %x\n", 1515 c.nonconformant_digital_display); 1516 if (!c.has_name_descriptor) 1517 printk(BIOS_ERR, "\tMissing name descriptor\n"); 1518 if (!c.has_preferred_timing) 1519 printk(BIOS_ERR, "\tMissing preferred timing\n"); 1520 if (!c.has_range_descriptor) 1521 printk(BIOS_ERR, "\tMissing monitor ranges\n"); 1522 /* Might be more than just 1.3 */ 1523 if (!c.has_valid_descriptor_pad) 1524 printk(BIOS_ERR, 1525 "\tInvalid descriptor block padding\n"); 1526 if (!c.has_valid_string_termination) /* Likewise */ 1527 printk(BIOS_ERR, 1528 "\tDetailed block string not properly terminated\n"); 1529 } else if (c.claims_one_point_two) { 1530 if (c.nonconformant_digital_display || 1531 !c.has_valid_string_termination) { 1532 c.conformant = EDID_NOT_CONFORMANT; 1533 printk(BIOS_ERR, 1534 "EDID block does NOT conform to EDID 1.2!\n"); 1535 } 1536 if (c.nonconformant_digital_display) 1537 printk(BIOS_ERR, 1538 "\tDigital display field contains garbage: %x\n", 1539 c.nonconformant_digital_display); 1540 if (!c.has_valid_string_termination) 1541 printk(BIOS_ERR, 1542 "\tDetailed block string not properly terminated\n"); 1543 } else if (c.claims_one_point_oh) { 1544 if (c.seen_non_detailed_descriptor) { 1545 c.conformant = EDID_NOT_CONFORMANT; 1546 printk(BIOS_ERR, 1547 "EDID block does NOT conform to EDID 1.0!\n"); 1548 } 1549 if (c.seen_non_detailed_descriptor) 1550 printk(BIOS_ERR, 1551 "\tHas descriptor blocks other than detailed timings\n"); 1552 } 1553 1554 if (c.nonconformant_extension || 1555 !c.has_valid_checksum || 1556 !c.has_valid_cvt || 1557 !c.has_valid_year || 1558 !c.has_valid_week || 1559 !c.has_valid_detailed_blocks || 1560 !c.has_valid_dummy_block || 1561 !c.has_valid_extension_count || 1562 !c.has_valid_descriptor_ordering || 1563 !c.has_valid_range_descriptor || 1564 !c.manufacturer_name_well_formed) { 1565 c.conformant = EDID_NOT_CONFORMANT; 1566 printk(BIOS_ERR, "EDID block does not conform at all!\n"); 1567 if (c.nonconformant_extension) 1568 printk(BIOS_ERR, 1569 "\tHas %d nonconformant extension block(s)\n", 1570 c.nonconformant_extension); 1571 if (!c.has_valid_checksum) 1572 printk(BIOS_ERR, "\tBlock has broken checksum\n"); 1573 if (!c.has_valid_cvt) 1574 printk(BIOS_ERR, "\tBroken 3-byte CVT blocks\n"); 1575 if (!c.has_valid_year) 1576 printk(BIOS_ERR, "\tBad year of manufacture\n"); 1577 if (!c.has_valid_week) 1578 printk(BIOS_ERR, "\tBad week of manufacture\n"); 1579 if (!c.has_valid_detailed_blocks) 1580 printk(BIOS_ERR, 1581 "\tDetailed blocks filled with garbage\n"); 1582 if (!c.has_valid_dummy_block) 1583 printk(BIOS_ERR, "\tDummy block filled with garbage\n"); 1584 if (!c.has_valid_extension_count) 1585 printk(BIOS_ERR, 1586 "\tImpossible extension block count\n"); 1587 if (!c.manufacturer_name_well_formed) 1588 printk(BIOS_ERR, 1589 "\tManufacturer name field contains garbage\n"); 1590 if (!c.has_valid_descriptor_ordering) 1591 printk(BIOS_ERR, 1592 "\tInvalid detailed timing descriptor ordering\n"); 1593 if (!c.has_valid_range_descriptor) 1594 printk(BIOS_ERR, 1595 "\tRange descriptor contains garbage\n"); 1596 if (!c.has_valid_max_dotclock) 1597 printk(BIOS_ERR, 1598 "\tEDID 1.4 block does not set max dotclock\n"); 1599 } 1600 1601 if (c.warning_excessive_dotclock_correction) 1602 printk(BIOS_ERR, 1603 "Warning: CVT block corrects dotclock by more than 9.75MHz\n"); 1604 if (c.warning_zero_preferred_refresh) 1605 printk(BIOS_ERR, 1606 "Warning: CVT block does not set preferred refresh rate\n"); 1607 return c.conformant; 1608 } 1609 1610 /* 1611 * Notes on panel extensions: (TODO, implement me in the code) 1612 * 1613 * EPI: http://www.epi-standard.org/fileadmin/spec/EPI_Specification1.0.pdf 1614 * at offset 0x6c (fourth detailed block): (all other bits reserved) 1615 * 0x6c: 00 00 00 0e 00 1616 * 0x71: bit 6-5: data color mapping (00 conventional/fpdi/vesa, 01 openldi) 1617 * bit 4-3: pixels per clock (00 1, 01 2, 10 4, 11 reserved) 1618 * bit 2-0: bits per pixel (000 18, 001 24, 010 30, else reserved) 1619 * 0x72: bit 5: FPSCLK polarity (0 normal 1 inverted) 1620 * bit 4: DE polarity (0 high active 1 low active) 1621 * bit 3-0: interface (0000 LVDS TFT 1622 * 0001 mono STN 4/8bit 1623 * 0010 color STN 8/16 bit 1624 * 0011 18 bit tft 1625 * 0100 24 bit tft 1626 * 0101 tmds 1627 * else reserved) 1628 * 0x73: bit 1: horizontal display mode (0 normal 1 right/left reverse) 1629 * bit 0: vertical display mode (0 normal 1 up/down reverse) 1630 * 0x74: bit 7-4: total poweroff seq delay (0000 vga controller default 1631 * else time in 10ms (10ms to 150ms)) 1632 * bit 3-0: total poweron seq delay (as above) 1633 * 0x75: contrast power on/off seq delay, same as 0x74 1634 * 0x76: bit 7: backlight control enable (1 means this field is valid) 1635 * bit 6: backlight enabled at boot (0 on 1 off) 1636 * bit 5-0: backlight brightness control steps (0..63) 1637 * 0x77: bit 7: contrast control, same bit pattern as 0x76 except bit 6 resvd 1638 * 0x78 - 0x7c: reserved 1639 * 0x7d: bit 7-4: EPI descriptor major version (1) 1640 * bit 3-0: EPI descriptor minor version (0) 1641 * 1642 * ---- 1643 * 1644 * SPWG: http://www.spwg.org/spwg_spec_version3.8_3-14-2007.pdf 1645 * 1646 * Since these are "dummy" blocks, terminate with 0a 20 20 20 ... as usual 1647 * 1648 * detailed descriptor 3: 1649 * 0x5a - 0x5e: 00 00 00 fe 00 1650 * 0x5f - 0x63: PC maker part number 1651 * 0x64: LCD supplier revision # 1652 * 0x65 - 0x6b: manufacturer part number 1653 * 1654 * detailed descriptor 4: 1655 * 0x6c - 0x70: 00 00 00 fe 00 1656 * 0x71 - 0x78: smbus nits values (whut) 1657 * 0x79: number of lvds channels (1 or 2) 1658 * 0x7A: panel self test (1 if present) 1659 * and then dummy terminator 1660 * 1661 * SPWG also says something strange about the LSB of detailed descriptor 1: 1662 * "LSB is set to "1" if panel is DE-timing only. H/V can be ignored." 1663 */ 1664 1665 /* Set the framebuffer bits-per-pixel, recalculating all dependent values. */ 1666 void edid_set_framebuffer_bits_per_pixel(struct edid *edid, int fb_bpp, 1667 int row_byte_alignment) 1668 { 1669 /* Caller should pass a supported value, everything else is BUG(). */ 1670 assert(fb_bpp == 32 || fb_bpp == 24 || fb_bpp == 16); 1671 row_byte_alignment = MAX(row_byte_alignment, 1); 1672 1673 edid->framebuffer_bits_per_pixel = fb_bpp; 1674 edid->bytes_per_line = ALIGN_UP(edid->mode.ha * 1675 DIV_ROUND_UP(fb_bpp, 8), row_byte_alignment); 1676 edid->x_resolution = edid->bytes_per_line / (fb_bpp / 8); 1677 edid->y_resolution = edid->mode.va; 1678 }