1 /* 2 * Copyright (c) 2006 Luc Verhaegen (quirks list) 3 * Copyright (c) 2007-2008 Intel Corporation 4 * Jesse Barnes <jesse.barnes@intel.com> 5 * Copyright 2010 Red Hat, Inc. 6 * 7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from 8 * FB layer. 9 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com> 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sub license, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the 19 * next paragraph) shall be included in all copies or substantial portions 20 * of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 28 * DEALINGS IN THE SOFTWARE. 29 * 30 * $FreeBSD: head/sys/dev/drm2/drm_edid.c 249041 2013-04-03 08:27:35Z dumbbell $ 31 */ 32 33 #include <linux/export.h> 34 #include <drm/drmP.h> 35 #include <drm/drm_crtc.h> 36 #include <drm/drm_edid.h> 37 #include "drm_edid_modes.h" 38 #include <bus/iicbus/iic.h> 39 #include <bus/iicbus/iiconf.h> 40 #include "iicbus_if.h" 41 42 #define version_greater(edid, maj, min) \ 43 (((edid)->version > (maj)) || \ 44 ((edid)->version == (maj) && (edid)->revision > (min))) 45 46 #define EDID_EST_TIMINGS 16 47 #define EDID_STD_TIMINGS 8 48 #define EDID_DETAILED_TIMINGS 4 49 50 /* 51 * EDID blocks out in the wild have a variety of bugs, try to collect 52 * them here (note that userspace may work around broken monitors first, 53 * but fixes should make their way here so that the kernel "just works" 54 * on as many displays as possible). 55 */ 56 57 /* First detailed mode wrong, use largest 60Hz mode */ 58 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 59 /* Reported 135MHz pixel clock is too high, needs adjustment */ 60 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 61 /* Prefer the largest mode at 75 Hz */ 62 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 63 /* Detail timing is in cm not mm */ 64 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 65 /* Detailed timing descriptors have bogus size values, so just take the 66 * maximum size and use that. 67 */ 68 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 69 /* Monitor forgot to set the first detailed is preferred bit. */ 70 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 71 /* use +hsync +vsync for detailed mode */ 72 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 73 74 struct detailed_mode_closure { 75 struct drm_connector *connector; 76 struct edid *edid; 77 bool preferred; 78 u32 quirks; 79 int modes; 80 }; 81 82 #define LEVEL_DMT 0 83 #define LEVEL_GTF 1 84 #define LEVEL_GTF2 2 85 #define LEVEL_CVT 3 86 87 static struct edid_quirk { 88 char *vendor; 89 int product_id; 90 u32 quirks; 91 } edid_quirk_list[] = { 92 /* Acer AL1706 */ 93 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 94 /* Acer F51 */ 95 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 96 /* Unknown Acer */ 97 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 98 99 /* Belinea 10 15 55 */ 100 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 101 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 102 103 /* Envision Peripherals, Inc. EN-7100e */ 104 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 105 /* Envision EN2028 */ 106 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 107 108 /* Funai Electronics PM36B */ 109 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 110 EDID_QUIRK_DETAILED_IN_CM }, 111 112 /* LG Philips LCD LP154W01-A5 */ 113 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 114 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 115 116 /* Philips 107p5 CRT */ 117 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 118 119 /* Proview AY765C */ 120 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 121 122 /* Samsung SyncMaster 205BW. Note: irony */ 123 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 124 /* Samsung SyncMaster 22[5-6]BW */ 125 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 126 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 127 }; 128 129 /*** DDC fetch and block validation ***/ 130 131 static const u8 edid_header[] = { 132 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 133 }; 134 135 /* 136 * Sanity check the header of the base EDID block. Return 8 if the header 137 * is perfect, down to 0 if it's totally wrong. 138 */ 139 int drm_edid_header_is_valid(const u8 *raw_edid) 140 { 141 int i, score = 0; 142 143 for (i = 0; i < sizeof(edid_header); i++) 144 if (raw_edid[i] == edid_header[i]) 145 score++; 146 147 return score; 148 } 149 150 /* 151 * Sanity check the EDID block (base or extension). Return 0 if the block 152 * doesn't check out, or 1 if it's valid. 153 */ 154 static bool 155 drm_edid_block_valid(u8 *raw_edid) 156 { 157 int i; 158 u8 csum = 0; 159 struct edid *edid = (struct edid *)raw_edid; 160 161 if (raw_edid[0] == 0x00) { 162 int score = drm_edid_header_is_valid(raw_edid); 163 if (score == 8) ; 164 else if (score >= 6) { 165 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 166 memcpy(raw_edid, edid_header, sizeof(edid_header)); 167 } else { 168 goto bad; 169 } 170 } 171 172 for (i = 0; i < EDID_LENGTH; i++) 173 csum += raw_edid[i]; 174 if (csum) { 175 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 176 177 /* allow CEA to slide through, switches mangle this */ 178 if (raw_edid[0] != 0x02) 179 goto bad; 180 } 181 182 /* per-block-type checks */ 183 switch (raw_edid[0]) { 184 case 0: /* base */ 185 if (edid->version != 1) { 186 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 187 goto bad; 188 } 189 190 if (edid->revision > 4) 191 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 192 break; 193 194 default: 195 break; 196 } 197 198 return 1; 199 200 bad: 201 if (raw_edid) { 202 DRM_DEBUG_KMS("Raw EDID:\n"); 203 if ((drm_debug & DRM_DEBUGBITS_KMS) != 0) { 204 for (i = 0; i < EDID_LENGTH; ) { 205 kprintf("%02x", raw_edid[i]); 206 i++; 207 if (i % 16 == 0 || i == EDID_LENGTH) 208 kprintf("\n"); 209 else if (i % 8 == 0) 210 kprintf(" "); 211 else 212 kprintf(" "); 213 } 214 } 215 } 216 return 0; 217 } 218 219 /** 220 * drm_edid_is_valid - sanity check EDID data 221 * @edid: EDID data 222 * 223 * Sanity-check an entire EDID record (including extensions) 224 */ 225 bool drm_edid_is_valid(struct edid *edid) 226 { 227 int i; 228 u8 *raw = (u8 *)edid; 229 230 if (!edid) 231 return false; 232 233 for (i = 0; i <= edid->extensions; i++) 234 if (!drm_edid_block_valid(raw + i * EDID_LENGTH)) 235 return false; 236 237 return true; 238 } 239 240 #define DDC_ADDR 0x50 241 #define DDC_SEGMENT_ADDR 0x30 242 /** 243 * Get EDID information via I2C. 244 * 245 * \param adapter : i2c device adaptor 246 * \param buf : EDID data buffer to be filled 247 * \param len : EDID data buffer length 248 * \return 0 on success or -1 on failure. 249 * 250 * Try to fetch EDID information by calling i2c driver function. 251 */ 252 static int 253 drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf, 254 int block, int len) 255 { 256 unsigned char start = block * EDID_LENGTH; 257 unsigned char segment = block >> 1; 258 unsigned char xfers = segment ? 3 : 2; 259 int ret, retries = 5; 260 261 /* The core i2c driver will automatically retry the transfer if the 262 * adapter reports EAGAIN. However, we find that bit-banging transfers 263 * are susceptible to errors under a heavily loaded machine and 264 * generate spurious NAKs and timeouts. Retrying the transfer 265 * of the individual block a few times seems to overcome this. 266 */ 267 do { 268 struct iic_msg msgs[] = { 269 { 270 .slave = DDC_SEGMENT_ADDR << 1, 271 .flags = 0, 272 .len = 1, 273 .buf = &segment, 274 }, { 275 .slave = DDC_ADDR << 1, 276 .flags = IIC_M_WR, 277 .len = 1, 278 .buf = &start, 279 }, { 280 .slave = DDC_ADDR << 1, 281 .flags = IIC_M_RD, 282 .len = len, 283 .buf = buf, 284 } 285 }; 286 287 /* 288 * Avoid sending the segment addr to not upset non-compliant ddc 289 * monitors. 290 */ 291 ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers); 292 293 if (ret != 0) 294 DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n", 295 retries, ret); 296 } while (ret != 0 && --retries); 297 298 return (ret == 0 ? 0 : -1); 299 } 300 301 static bool drm_edid_is_zero(u8 *in_edid, int length) 302 { 303 int i; 304 u32 *raw_edid = (u32 *)in_edid; 305 306 for (i = 0; i < length / 4; i++) 307 if (*(raw_edid + i) != 0) 308 return false; 309 return true; 310 } 311 312 static u8 * 313 drm_do_get_edid(struct drm_connector *connector, device_t adapter) 314 { 315 int i, j = 0, valid_extensions = 0; 316 u8 *block, *new; 317 318 block = kmalloc(EDID_LENGTH, DRM_MEM_KMS, M_WAITOK | M_ZERO); 319 320 /* base block fetch */ 321 for (i = 0; i < 4; i++) { 322 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 323 goto out; 324 if (drm_edid_block_valid(block)) 325 break; 326 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 327 connector->null_edid_counter++; 328 goto carp; 329 } 330 } 331 if (i == 4) 332 goto carp; 333 334 /* if there's no extensions, we're done */ 335 if (block[0x7e] == 0) 336 return block; 337 338 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, DRM_MEM_KMS, 339 M_WAITOK); 340 block = new; 341 342 for (j = 1; j <= block[0x7e]; j++) { 343 for (i = 0; i < 4; i++) { 344 if (drm_do_probe_ddc_edid(adapter, 345 block + (valid_extensions + 1) * EDID_LENGTH, 346 j, EDID_LENGTH)) 347 goto out; 348 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 349 valid_extensions++; 350 break; 351 } 352 } 353 if (i == 4) 354 DRM_DEBUG_KMS("%s: Ignoring invalid EDID block %d.\n", 355 drm_get_connector_name(connector), j); 356 } 357 358 if (valid_extensions != block[0x7e]) { 359 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 360 block[0x7e] = valid_extensions; 361 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, 362 DRM_MEM_KMS, M_WAITOK); 363 block = new; 364 } 365 366 DRM_DEBUG_KMS("got EDID from %s\n", drm_get_connector_name(connector)); 367 return block; 368 369 carp: 370 DRM_ERROR("%s: EDID block %d invalid.\n", 371 drm_get_connector_name(connector), j); 372 373 out: 374 drm_free(block, DRM_MEM_KMS); 375 return NULL; 376 } 377 378 /** 379 * Probe DDC presence. 380 * 381 * \param adapter : i2c device adaptor 382 * \return 1 on success 383 */ 384 static bool 385 drm_probe_ddc(device_t adapter) 386 { 387 unsigned char out; 388 389 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 390 } 391 392 /** 393 * drm_get_edid - get EDID data, if available 394 * @connector: connector we're probing 395 * @adapter: i2c adapter to use for DDC 396 * 397 * Poke the given i2c channel to grab EDID data if possible. If found, 398 * attach it to the connector. 399 * 400 * Return edid data or NULL if we couldn't find any. 401 */ 402 struct edid *drm_get_edid(struct drm_connector *connector, 403 device_t adapter) 404 { 405 struct edid *edid = NULL; 406 407 if (drm_probe_ddc(adapter)) 408 edid = (struct edid *)drm_do_get_edid(connector, adapter); 409 410 return edid; 411 } 412 EXPORT_SYMBOL(drm_get_edid); 413 414 /*** EDID parsing ***/ 415 416 /** 417 * edid_vendor - match a string against EDID's obfuscated vendor field 418 * @edid: EDID to match 419 * @vendor: vendor string 420 * 421 * Returns true if @vendor is in @edid, false otherwise 422 */ 423 static bool edid_vendor(struct edid *edid, char *vendor) 424 { 425 char edid_vendor[3]; 426 427 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 428 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 429 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 430 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 431 432 return !strncmp(edid_vendor, vendor, 3); 433 } 434 435 /** 436 * edid_get_quirks - return quirk flags for a given EDID 437 * @edid: EDID to process 438 * 439 * This tells subsequent routines what fixes they need to apply. 440 */ 441 static u32 edid_get_quirks(struct edid *edid) 442 { 443 struct edid_quirk *quirk; 444 int i; 445 446 for (i = 0; i < DRM_ARRAY_SIZE(edid_quirk_list); i++) { 447 quirk = &edid_quirk_list[i]; 448 449 if (edid_vendor(edid, quirk->vendor) && 450 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 451 return quirk->quirks; 452 } 453 454 return 0; 455 } 456 457 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 458 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 459 460 /** 461 * edid_fixup_preferred - set preferred modes based on quirk list 462 * @connector: has mode list to fix up 463 * @quirks: quirks list 464 * 465 * Walk the mode list for @connector, clearing the preferred status 466 * on existing modes and setting it anew for the right mode ala @quirks. 467 */ 468 static void edid_fixup_preferred(struct drm_connector *connector, 469 u32 quirks) 470 { 471 struct drm_display_mode *t, *cur_mode, *preferred_mode; 472 int target_refresh = 0; 473 474 if (list_empty(&connector->probed_modes)) 475 return; 476 477 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 478 target_refresh = 60; 479 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 480 target_refresh = 75; 481 482 preferred_mode = list_first_entry(&connector->probed_modes, 483 struct drm_display_mode, head); 484 485 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 486 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 487 488 if (cur_mode == preferred_mode) 489 continue; 490 491 /* Largest mode is preferred */ 492 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 493 preferred_mode = cur_mode; 494 495 /* At a given size, try to get closest to target refresh */ 496 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 497 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 498 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 499 preferred_mode = cur_mode; 500 } 501 } 502 503 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 504 } 505 506 /* 507 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 508 * @dev: Device to duplicate against 509 * @hsize: Mode width 510 * @vsize: Mode height 511 * @fresh: Mode refresh rate 512 * @rb: Mode reduced-blanking-ness 513 * 514 * Walk the DMT mode list looking for a match for the given parameters. 515 * Return a newly allocated copy of the mode, or NULL if not found. 516 */ 517 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 518 int hsize, int vsize, int fresh) 519 { 520 struct drm_display_mode *mode = NULL; 521 int i; 522 523 for (i = 0; i < drm_num_dmt_modes; i++) { 524 struct drm_display_mode *ptr = &drm_dmt_modes[i]; 525 if (hsize == ptr->hdisplay && 526 vsize == ptr->vdisplay && 527 fresh == drm_mode_vrefresh(ptr)) { 528 /* get the expected default mode */ 529 mode = drm_mode_duplicate(dev, ptr); 530 break; 531 } 532 } 533 return mode; 534 } 535 EXPORT_SYMBOL(drm_mode_find_dmt); 536 537 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 538 539 static void 540 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 541 { 542 int i, n = 0; 543 u8 d = ext[0x02]; 544 u8 *det_base = ext + d; 545 546 n = (127 - d) / 18; 547 for (i = 0; i < n; i++) 548 cb((struct detailed_timing *)(det_base + 18 * i), closure); 549 } 550 551 static void 552 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 553 { 554 unsigned int i, n = min((int)ext[0x02], 6); 555 u8 *det_base = ext + 5; 556 557 if (ext[0x01] != 1) 558 return; /* unknown version */ 559 560 for (i = 0; i < n; i++) 561 cb((struct detailed_timing *)(det_base + 18 * i), closure); 562 } 563 564 static void 565 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 566 { 567 int i; 568 struct edid *edid = (struct edid *)raw_edid; 569 570 if (edid == NULL) 571 return; 572 573 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 574 cb(&(edid->detailed_timings[i]), closure); 575 576 for (i = 1; i <= raw_edid[0x7e]; i++) { 577 u8 *ext = raw_edid + (i * EDID_LENGTH); 578 switch (*ext) { 579 case CEA_EXT: 580 cea_for_each_detailed_block(ext, cb, closure); 581 break; 582 case VTB_EXT: 583 vtb_for_each_detailed_block(ext, cb, closure); 584 break; 585 default: 586 break; 587 } 588 } 589 } 590 591 static void 592 is_rb(struct detailed_timing *t, void *data) 593 { 594 u8 *r = (u8 *)t; 595 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 596 if (r[15] & 0x10) 597 *(bool *)data = true; 598 } 599 600 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 601 static bool 602 drm_monitor_supports_rb(struct edid *edid) 603 { 604 if (edid->revision >= 4) { 605 bool ret; 606 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 607 return ret; 608 } 609 610 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 611 } 612 613 static void 614 find_gtf2(struct detailed_timing *t, void *data) 615 { 616 u8 *r = (u8 *)t; 617 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 618 *(u8 **)data = r; 619 } 620 621 /* Secondary GTF curve kicks in above some break frequency */ 622 static int 623 drm_gtf2_hbreak(struct edid *edid) 624 { 625 u8 *r = NULL; 626 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 627 return r ? (r[12] * 2) : 0; 628 } 629 630 static int 631 drm_gtf2_2c(struct edid *edid) 632 { 633 u8 *r = NULL; 634 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 635 return r ? r[13] : 0; 636 } 637 638 static int 639 drm_gtf2_m(struct edid *edid) 640 { 641 u8 *r = NULL; 642 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 643 return r ? (r[15] << 8) + r[14] : 0; 644 } 645 646 static int 647 drm_gtf2_k(struct edid *edid) 648 { 649 u8 *r = NULL; 650 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 651 return r ? r[16] : 0; 652 } 653 654 static int 655 drm_gtf2_2j(struct edid *edid) 656 { 657 u8 *r = NULL; 658 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 659 return r ? r[17] : 0; 660 } 661 662 /** 663 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 664 * @edid: EDID block to scan 665 */ 666 static int standard_timing_level(struct edid *edid) 667 { 668 if (edid->revision >= 2) { 669 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 670 return LEVEL_CVT; 671 if (drm_gtf2_hbreak(edid)) 672 return LEVEL_GTF2; 673 return LEVEL_GTF; 674 } 675 return LEVEL_DMT; 676 } 677 678 /* 679 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 680 * monitors fill with ascii space (0x20) instead. 681 */ 682 static int 683 bad_std_timing(u8 a, u8 b) 684 { 685 return (a == 0x00 && b == 0x00) || 686 (a == 0x01 && b == 0x01) || 687 (a == 0x20 && b == 0x20); 688 } 689 690 /** 691 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 692 * @t: standard timing params 693 * @timing_level: standard timing level 694 * 695 * Take the standard timing params (in this case width, aspect, and refresh) 696 * and convert them into a real mode using CVT/GTF/DMT. 697 */ 698 static struct drm_display_mode * 699 drm_mode_std(struct drm_connector *connector, struct edid *edid, 700 struct std_timing *t, int revision) 701 { 702 struct drm_device *dev = connector->dev; 703 struct drm_display_mode *m, *mode = NULL; 704 int hsize, vsize; 705 int vrefresh_rate; 706 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 707 >> EDID_TIMING_ASPECT_SHIFT; 708 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 709 >> EDID_TIMING_VFREQ_SHIFT; 710 int timing_level = standard_timing_level(edid); 711 712 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 713 return NULL; 714 715 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 716 hsize = t->hsize * 8 + 248; 717 /* vrefresh_rate = vfreq + 60 */ 718 vrefresh_rate = vfreq + 60; 719 /* the vdisplay is calculated based on the aspect ratio */ 720 if (aspect_ratio == 0) { 721 if (revision < 3) 722 vsize = hsize; 723 else 724 vsize = (hsize * 10) / 16; 725 } else if (aspect_ratio == 1) 726 vsize = (hsize * 3) / 4; 727 else if (aspect_ratio == 2) 728 vsize = (hsize * 4) / 5; 729 else 730 vsize = (hsize * 9) / 16; 731 732 /* HDTV hack, part 1 */ 733 if (vrefresh_rate == 60 && 734 ((hsize == 1360 && vsize == 765) || 735 (hsize == 1368 && vsize == 769))) { 736 hsize = 1366; 737 vsize = 768; 738 } 739 740 /* 741 * If this connector already has a mode for this size and refresh 742 * rate (because it came from detailed or CVT info), use that 743 * instead. This way we don't have to guess at interlace or 744 * reduced blanking. 745 */ 746 list_for_each_entry(m, &connector->probed_modes, head) 747 if (m->hdisplay == hsize && m->vdisplay == vsize && 748 drm_mode_vrefresh(m) == vrefresh_rate) 749 return NULL; 750 751 /* HDTV hack, part 2 */ 752 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 753 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 754 false); 755 mode->hdisplay = 1366; 756 mode->hsync_start = mode->hsync_start - 1; 757 mode->hsync_end = mode->hsync_end - 1; 758 return mode; 759 } 760 761 /* check whether it can be found in default mode table */ 762 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 763 if (mode) 764 return mode; 765 766 switch (timing_level) { 767 case LEVEL_DMT: 768 break; 769 case LEVEL_GTF: 770 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 771 break; 772 case LEVEL_GTF2: 773 /* 774 * This is potentially wrong if there's ever a monitor with 775 * more than one ranges section, each claiming a different 776 * secondary GTF curve. Please don't do that. 777 */ 778 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 779 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 780 drm_free(mode, DRM_MEM_KMS); 781 mode = drm_gtf_mode_complex(dev, hsize, vsize, 782 vrefresh_rate, 0, 0, 783 drm_gtf2_m(edid), 784 drm_gtf2_2c(edid), 785 drm_gtf2_k(edid), 786 drm_gtf2_2j(edid)); 787 } 788 break; 789 case LEVEL_CVT: 790 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 791 false); 792 break; 793 } 794 return mode; 795 } 796 797 /* 798 * EDID is delightfully ambiguous about how interlaced modes are to be 799 * encoded. Our internal representation is of frame height, but some 800 * HDTV detailed timings are encoded as field height. 801 * 802 * The format list here is from CEA, in frame size. Technically we 803 * should be checking refresh rate too. Whatever. 804 */ 805 static void 806 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 807 struct detailed_pixel_timing *pt) 808 { 809 int i; 810 static const struct { 811 int w, h; 812 } cea_interlaced[] = { 813 { 1920, 1080 }, 814 { 720, 480 }, 815 { 1440, 480 }, 816 { 2880, 480 }, 817 { 720, 576 }, 818 { 1440, 576 }, 819 { 2880, 576 }, 820 }; 821 822 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 823 return; 824 825 for (i = 0; i < DRM_ARRAY_SIZE(cea_interlaced); i++) { 826 if ((mode->hdisplay == cea_interlaced[i].w) && 827 (mode->vdisplay == cea_interlaced[i].h / 2)) { 828 mode->vdisplay *= 2; 829 mode->vsync_start *= 2; 830 mode->vsync_end *= 2; 831 mode->vtotal *= 2; 832 mode->vtotal |= 1; 833 } 834 } 835 836 mode->flags |= DRM_MODE_FLAG_INTERLACE; 837 } 838 839 /** 840 * drm_mode_detailed - create a new mode from an EDID detailed timing section 841 * @dev: DRM device (needed to create new mode) 842 * @edid: EDID block 843 * @timing: EDID detailed timing info 844 * @quirks: quirks to apply 845 * 846 * An EDID detailed timing block contains enough info for us to create and 847 * return a new struct drm_display_mode. 848 */ 849 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 850 struct edid *edid, 851 struct detailed_timing *timing, 852 u32 quirks) 853 { 854 struct drm_display_mode *mode; 855 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 856 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 857 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 858 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 859 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 860 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 861 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 862 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 863 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 864 865 /* ignore tiny modes */ 866 if (hactive < 64 || vactive < 64) 867 return NULL; 868 869 if (pt->misc & DRM_EDID_PT_STEREO) { 870 kprintf("stereo mode not supported\n"); 871 return NULL; 872 } 873 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 874 kprintf("composite sync not supported\n"); 875 } 876 877 /* it is incorrect if hsync/vsync width is zero */ 878 if (!hsync_pulse_width || !vsync_pulse_width) { 879 DRM_DEBUG_KMS("Incorrect Detailed timing. " 880 "Wrong Hsync/Vsync pulse width\n"); 881 return NULL; 882 } 883 mode = drm_mode_create(dev); 884 if (!mode) 885 return NULL; 886 887 mode->type = DRM_MODE_TYPE_DRIVER; 888 889 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 890 timing->pixel_clock = htole16(1088); 891 892 mode->clock = le16toh(timing->pixel_clock) * 10; 893 894 mode->hdisplay = hactive; 895 mode->hsync_start = mode->hdisplay + hsync_offset; 896 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 897 mode->htotal = mode->hdisplay + hblank; 898 899 mode->vdisplay = vactive; 900 mode->vsync_start = mode->vdisplay + vsync_offset; 901 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 902 mode->vtotal = mode->vdisplay + vblank; 903 904 /* Some EDIDs have bogus h/vtotal values */ 905 if (mode->hsync_end > mode->htotal) 906 mode->htotal = mode->hsync_end + 1; 907 if (mode->vsync_end > mode->vtotal) 908 mode->vtotal = mode->vsync_end + 1; 909 910 drm_mode_do_interlace_quirk(mode, pt); 911 912 drm_mode_set_name(mode); 913 914 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 915 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 916 } 917 918 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 919 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 920 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 921 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 922 923 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 924 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 925 926 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 927 mode->width_mm *= 10; 928 mode->height_mm *= 10; 929 } 930 931 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 932 mode->width_mm = edid->width_cm * 10; 933 mode->height_mm = edid->height_cm * 10; 934 } 935 936 return mode; 937 } 938 939 static bool 940 mode_is_rb(const struct drm_display_mode *mode) 941 { 942 return (mode->htotal - mode->hdisplay == 160) && 943 (mode->hsync_end - mode->hdisplay == 80) && 944 (mode->hsync_end - mode->hsync_start == 32) && 945 (mode->vsync_start - mode->vdisplay == 3); 946 } 947 948 static bool 949 mode_in_hsync_range(struct drm_display_mode *mode, 950 struct edid *edid, u8 *t) 951 { 952 int hsync, hmin, hmax; 953 954 hmin = t[7]; 955 if (edid->revision >= 4) 956 hmin += ((t[4] & 0x04) ? 255 : 0); 957 hmax = t[8]; 958 if (edid->revision >= 4) 959 hmax += ((t[4] & 0x08) ? 255 : 0); 960 hsync = drm_mode_hsync(mode); 961 962 return (hsync <= hmax && hsync >= hmin); 963 } 964 965 static bool 966 mode_in_vsync_range(struct drm_display_mode *mode, 967 struct edid *edid, u8 *t) 968 { 969 int vsync, vmin, vmax; 970 971 vmin = t[5]; 972 if (edid->revision >= 4) 973 vmin += ((t[4] & 0x01) ? 255 : 0); 974 vmax = t[6]; 975 if (edid->revision >= 4) 976 vmax += ((t[4] & 0x02) ? 255 : 0); 977 vsync = drm_mode_vrefresh(mode); 978 979 return (vsync <= vmax && vsync >= vmin); 980 } 981 982 static u32 983 range_pixel_clock(struct edid *edid, u8 *t) 984 { 985 /* unspecified */ 986 if (t[9] == 0 || t[9] == 255) 987 return 0; 988 989 /* 1.4 with CVT support gives us real precision, yay */ 990 if (edid->revision >= 4 && t[10] == 0x04) 991 return (t[9] * 10000) - ((t[12] >> 2) * 250); 992 993 /* 1.3 is pathetic, so fuzz up a bit */ 994 return t[9] * 10000 + 5001; 995 } 996 997 static bool 998 mode_in_range(struct drm_display_mode *mode, struct edid *edid, 999 struct detailed_timing *timing) 1000 { 1001 u32 max_clock; 1002 u8 *t = (u8 *)timing; 1003 1004 if (!mode_in_hsync_range(mode, edid, t)) 1005 return false; 1006 1007 if (!mode_in_vsync_range(mode, edid, t)) 1008 return false; 1009 1010 if ((max_clock = range_pixel_clock(edid, t))) 1011 if (mode->clock > max_clock) 1012 return false; 1013 1014 /* 1.4 max horizontal check */ 1015 if (edid->revision >= 4 && t[10] == 0x04) 1016 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1017 return false; 1018 1019 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1020 return false; 1021 1022 return true; 1023 } 1024 1025 /* 1026 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 1027 * need to account for them. 1028 */ 1029 static int 1030 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1031 struct detailed_timing *timing) 1032 { 1033 int i, modes = 0; 1034 struct drm_display_mode *newmode; 1035 struct drm_device *dev = connector->dev; 1036 1037 for (i = 0; i < drm_num_dmt_modes; i++) { 1038 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1039 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1040 if (newmode) { 1041 drm_mode_probed_add(connector, newmode); 1042 modes++; 1043 } 1044 } 1045 } 1046 1047 return modes; 1048 } 1049 1050 static void 1051 do_inferred_modes(struct detailed_timing *timing, void *c) 1052 { 1053 struct detailed_mode_closure *closure = c; 1054 struct detailed_non_pixel *data = &timing->data.other_data; 1055 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1056 1057 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1058 closure->modes += drm_gtf_modes_for_range(closure->connector, 1059 closure->edid, 1060 timing); 1061 } 1062 1063 static int 1064 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1065 { 1066 struct detailed_mode_closure closure = { 1067 connector, edid, 0, 0, 0 1068 }; 1069 1070 if (version_greater(edid, 1, 0)) 1071 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1072 &closure); 1073 1074 return closure.modes; 1075 } 1076 1077 static int 1078 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1079 { 1080 int i, j, m, modes = 0; 1081 struct drm_display_mode *mode; 1082 u8 *est = ((u8 *)timing) + 5; 1083 1084 for (i = 0; i < 6; i++) { 1085 for (j = 7; j > 0; j--) { 1086 m = (i * 8) + (7 - j); 1087 if (m >= DRM_ARRAY_SIZE(est3_modes)) 1088 break; 1089 if (est[i] & (1 << j)) { 1090 mode = drm_mode_find_dmt(connector->dev, 1091 est3_modes[m].w, 1092 est3_modes[m].h, 1093 est3_modes[m].r 1094 /*, est3_modes[m].rb */); 1095 if (mode) { 1096 drm_mode_probed_add(connector, mode); 1097 modes++; 1098 } 1099 } 1100 } 1101 } 1102 1103 return modes; 1104 } 1105 1106 static void 1107 do_established_modes(struct detailed_timing *timing, void *c) 1108 { 1109 struct detailed_mode_closure *closure = c; 1110 struct detailed_non_pixel *data = &timing->data.other_data; 1111 1112 if (data->type == EDID_DETAIL_EST_TIMINGS) 1113 closure->modes += drm_est3_modes(closure->connector, timing); 1114 } 1115 1116 /** 1117 * add_established_modes - get est. modes from EDID and add them 1118 * @edid: EDID block to scan 1119 * 1120 * Each EDID block contains a bitmap of the supported "established modes" list 1121 * (defined above). Tease them out and add them to the global modes list. 1122 */ 1123 static int 1124 add_established_modes(struct drm_connector *connector, struct edid *edid) 1125 { 1126 struct drm_device *dev = connector->dev; 1127 unsigned long est_bits = edid->established_timings.t1 | 1128 (edid->established_timings.t2 << 8) | 1129 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1130 int i, modes = 0; 1131 struct detailed_mode_closure closure = { 1132 connector, edid, 0, 0, 0 1133 }; 1134 1135 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1136 if (est_bits & (1<<i)) { 1137 struct drm_display_mode *newmode; 1138 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1139 if (newmode) { 1140 drm_mode_probed_add(connector, newmode); 1141 modes++; 1142 } 1143 } 1144 } 1145 1146 if (version_greater(edid, 1, 0)) 1147 drm_for_each_detailed_block((u8 *)edid, 1148 do_established_modes, &closure); 1149 1150 return modes + closure.modes; 1151 } 1152 1153 static void 1154 do_standard_modes(struct detailed_timing *timing, void *c) 1155 { 1156 struct detailed_mode_closure *closure = c; 1157 struct detailed_non_pixel *data = &timing->data.other_data; 1158 struct drm_connector *connector = closure->connector; 1159 struct edid *edid = closure->edid; 1160 1161 if (data->type == EDID_DETAIL_STD_MODES) { 1162 int i; 1163 for (i = 0; i < 6; i++) { 1164 struct std_timing *std; 1165 struct drm_display_mode *newmode; 1166 1167 std = &data->data.timings[i]; 1168 newmode = drm_mode_std(connector, edid, std, 1169 edid->revision); 1170 if (newmode) { 1171 drm_mode_probed_add(connector, newmode); 1172 closure->modes++; 1173 } 1174 } 1175 } 1176 } 1177 1178 /** 1179 * add_standard_modes - get std. modes from EDID and add them 1180 * @edid: EDID block to scan 1181 * 1182 * Standard modes can be calculated using the appropriate standard (DMT, 1183 * GTF or CVT. Grab them from @edid and add them to the list. 1184 */ 1185 static int 1186 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1187 { 1188 int i, modes = 0; 1189 struct detailed_mode_closure closure = { 1190 connector, edid, 0, 0, 0 1191 }; 1192 1193 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1194 struct drm_display_mode *newmode; 1195 1196 newmode = drm_mode_std(connector, edid, 1197 &edid->standard_timings[i], 1198 edid->revision); 1199 if (newmode) { 1200 drm_mode_probed_add(connector, newmode); 1201 modes++; 1202 } 1203 } 1204 1205 if (version_greater(edid, 1, 0)) 1206 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1207 &closure); 1208 1209 /* XXX should also look for standard codes in VTB blocks */ 1210 1211 return modes + closure.modes; 1212 } 1213 1214 static int drm_cvt_modes(struct drm_connector *connector, 1215 struct detailed_timing *timing) 1216 { 1217 int i, j, modes = 0; 1218 struct drm_display_mode *newmode; 1219 struct drm_device *dev = connector->dev; 1220 struct cvt_timing *cvt; 1221 const int rates[] = { 60, 85, 75, 60, 50 }; 1222 const u8 empty[3] = { 0, 0, 0 }; 1223 1224 for (i = 0; i < 4; i++) { 1225 int width = 0, height; 1226 cvt = &(timing->data.other_data.data.cvt[i]); 1227 1228 if (!memcmp(cvt->code, empty, 3)) 1229 continue; 1230 1231 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1232 switch (cvt->code[1] & 0x0c) { 1233 case 0x00: 1234 width = height * 4 / 3; 1235 break; 1236 case 0x04: 1237 width = height * 16 / 9; 1238 break; 1239 case 0x08: 1240 width = height * 16 / 10; 1241 break; 1242 case 0x0c: 1243 width = height * 15 / 9; 1244 break; 1245 } 1246 1247 for (j = 1; j < 5; j++) { 1248 if (cvt->code[2] & (1 << j)) { 1249 newmode = drm_cvt_mode(dev, width, height, 1250 rates[j], j == 0, 1251 false, false); 1252 if (newmode) { 1253 drm_mode_probed_add(connector, newmode); 1254 modes++; 1255 } 1256 } 1257 } 1258 } 1259 1260 return modes; 1261 } 1262 1263 static void 1264 do_cvt_mode(struct detailed_timing *timing, void *c) 1265 { 1266 struct detailed_mode_closure *closure = c; 1267 struct detailed_non_pixel *data = &timing->data.other_data; 1268 1269 if (data->type == EDID_DETAIL_CVT_3BYTE) 1270 closure->modes += drm_cvt_modes(closure->connector, timing); 1271 } 1272 1273 static int 1274 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1275 { 1276 struct detailed_mode_closure closure = { 1277 connector, edid, 0, 0, 0 1278 }; 1279 1280 if (version_greater(edid, 1, 2)) 1281 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1282 1283 /* XXX should also look for CVT codes in VTB blocks */ 1284 1285 return closure.modes; 1286 } 1287 1288 static void 1289 do_detailed_mode(struct detailed_timing *timing, void *c) 1290 { 1291 struct detailed_mode_closure *closure = c; 1292 struct drm_display_mode *newmode; 1293 1294 if (timing->pixel_clock) { 1295 newmode = drm_mode_detailed(closure->connector->dev, 1296 closure->edid, timing, 1297 closure->quirks); 1298 if (!newmode) 1299 return; 1300 1301 if (closure->preferred) 1302 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1303 1304 drm_mode_probed_add(closure->connector, newmode); 1305 closure->modes++; 1306 closure->preferred = 0; 1307 } 1308 } 1309 1310 /* 1311 * add_detailed_modes - Add modes from detailed timings 1312 * @connector: attached connector 1313 * @edid: EDID block to scan 1314 * @quirks: quirks to apply 1315 */ 1316 static int 1317 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1318 u32 quirks) 1319 { 1320 struct detailed_mode_closure closure = { 1321 connector, 1322 edid, 1323 1, 1324 quirks, 1325 0 1326 }; 1327 1328 if (closure.preferred && !version_greater(edid, 1, 3)) 1329 closure.preferred = 1330 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1331 1332 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1333 1334 return closure.modes; 1335 } 1336 1337 #define HDMI_IDENTIFIER 0x000C03 1338 #define AUDIO_BLOCK 0x01 1339 #define VENDOR_BLOCK 0x03 1340 #define SPEAKER_BLOCK 0x04 1341 #define EDID_BASIC_AUDIO (1 << 6) 1342 1343 /** 1344 * Search EDID for CEA extension block. 1345 */ 1346 u8 *drm_find_cea_extension(struct edid *edid) 1347 { 1348 u8 *edid_ext = NULL; 1349 int i; 1350 1351 /* No EDID or EDID extensions */ 1352 if (edid == NULL || edid->extensions == 0) 1353 return NULL; 1354 1355 /* Find CEA extension */ 1356 for (i = 0; i < edid->extensions; i++) { 1357 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1358 if (edid_ext[0] == CEA_EXT) 1359 break; 1360 } 1361 1362 if (i == edid->extensions) 1363 return NULL; 1364 1365 return edid_ext; 1366 } 1367 1368 static void 1369 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1370 { 1371 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1372 1373 connector->dvi_dual = db[6] & 1; 1374 connector->max_tmds_clock = db[7] * 5; 1375 1376 connector->latency_present[0] = db[8] >> 7; 1377 connector->latency_present[1] = (db[8] >> 6) & 1; 1378 connector->video_latency[0] = db[9]; 1379 connector->audio_latency[0] = db[10]; 1380 connector->video_latency[1] = db[11]; 1381 connector->audio_latency[1] = db[12]; 1382 1383 DRM_DEBUG_KMS("HDMI: DVI dual %d, " 1384 "max TMDS clock %d, " 1385 "latency present %d %d, " 1386 "video latency %d %d, " 1387 "audio latency %d %d\n", 1388 connector->dvi_dual, 1389 connector->max_tmds_clock, 1390 (int) connector->latency_present[0], 1391 (int) connector->latency_present[1], 1392 connector->video_latency[0], 1393 connector->video_latency[1], 1394 connector->audio_latency[0], 1395 connector->audio_latency[1]); 1396 } 1397 1398 static void 1399 monitor_name(struct detailed_timing *t, void *data) 1400 { 1401 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1402 *(u8 **)data = t->data.other_data.data.str.str; 1403 } 1404 1405 /** 1406 * drm_edid_to_eld - build ELD from EDID 1407 * @connector: connector corresponding to the HDMI/DP sink 1408 * @edid: EDID to parse 1409 * 1410 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1411 * Some ELD fields are left to the graphics driver caller: 1412 * - Conn_Type 1413 * - HDCP 1414 * - Port_ID 1415 */ 1416 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1417 { 1418 uint8_t *eld = connector->eld; 1419 u8 *cea; 1420 u8 *name; 1421 u8 *db; 1422 int sad_count = 0; 1423 int mnl; 1424 int dbl; 1425 1426 memset(eld, 0, sizeof(connector->eld)); 1427 1428 cea = drm_find_cea_extension(edid); 1429 if (!cea) { 1430 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1431 return; 1432 } 1433 1434 name = NULL; 1435 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1436 for (mnl = 0; name && mnl < 13; mnl++) { 1437 if (name[mnl] == 0x0a) 1438 break; 1439 eld[20 + mnl] = name[mnl]; 1440 } 1441 eld[4] = (cea[1] << 5) | mnl; 1442 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1443 1444 eld[0] = 2 << 3; /* ELD version: 2 */ 1445 1446 eld[16] = edid->mfg_id[0]; 1447 eld[17] = edid->mfg_id[1]; 1448 eld[18] = edid->prod_code[0]; 1449 eld[19] = edid->prod_code[1]; 1450 1451 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1452 dbl = db[0] & 0x1f; 1453 1454 switch ((db[0] & 0xe0) >> 5) { 1455 case AUDIO_BLOCK: /* Audio Data Block, contains SADs */ 1456 sad_count = dbl / 3; 1457 memcpy(eld + 20 + mnl, &db[1], dbl); 1458 break; 1459 case SPEAKER_BLOCK: /* Speaker Allocation Data Block */ 1460 eld[7] = db[1]; 1461 break; 1462 case VENDOR_BLOCK: 1463 /* HDMI Vendor-Specific Data Block */ 1464 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1465 parse_hdmi_vsdb(connector, db); 1466 break; 1467 default: 1468 break; 1469 } 1470 } 1471 eld[5] |= sad_count << 4; 1472 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1473 1474 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1475 } 1476 1477 /** 1478 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1479 * @connector: connector associated with the HDMI/DP sink 1480 * @mode: the display mode 1481 */ 1482 int drm_av_sync_delay(struct drm_connector *connector, 1483 struct drm_display_mode *mode) 1484 { 1485 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1486 int a, v; 1487 1488 if (!connector->latency_present[0]) 1489 return 0; 1490 if (!connector->latency_present[1]) 1491 i = 0; 1492 1493 a = connector->audio_latency[i]; 1494 v = connector->video_latency[i]; 1495 1496 /* 1497 * HDMI/DP sink doesn't support audio or video? 1498 */ 1499 if (a == 255 || v == 255) 1500 return 0; 1501 1502 /* 1503 * Convert raw EDID values to millisecond. 1504 * Treat unknown latency as 0ms. 1505 */ 1506 if (a) 1507 a = min(2 * (a - 1), 500); 1508 if (v) 1509 v = min(2 * (v - 1), 500); 1510 1511 return max(v - a, 0); 1512 } 1513 1514 /** 1515 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1516 * @encoder: the encoder just changed display mode 1517 * @mode: the adjusted display mode 1518 * 1519 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1520 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1521 */ 1522 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1523 struct drm_display_mode *mode) 1524 { 1525 struct drm_connector *connector; 1526 struct drm_device *dev = encoder->dev; 1527 1528 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1529 if (connector->encoder == encoder && connector->eld[0]) 1530 return connector; 1531 1532 return NULL; 1533 } 1534 1535 /** 1536 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1537 * @edid: monitor EDID information 1538 * 1539 * Parse the CEA extension according to CEA-861-B. 1540 * Return true if HDMI, false if not or unknown. 1541 */ 1542 bool drm_detect_hdmi_monitor(struct edid *edid) 1543 { 1544 u8 *edid_ext; 1545 int i, hdmi_id; 1546 int start_offset, end_offset; 1547 bool is_hdmi = false; 1548 1549 edid_ext = drm_find_cea_extension(edid); 1550 if (!edid_ext) 1551 goto end; 1552 1553 /* Data block offset in CEA extension block */ 1554 start_offset = 4; 1555 end_offset = edid_ext[2]; 1556 1557 /* 1558 * Because HDMI identifier is in Vendor Specific Block, 1559 * search it from all data blocks of CEA extension. 1560 */ 1561 for (i = start_offset; i < end_offset; 1562 /* Increased by data block len */ 1563 i += ((edid_ext[i] & 0x1f) + 1)) { 1564 /* Find vendor specific block */ 1565 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1566 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1567 edid_ext[i + 3] << 16; 1568 /* Find HDMI identifier */ 1569 if (hdmi_id == HDMI_IDENTIFIER) 1570 is_hdmi = true; 1571 break; 1572 } 1573 } 1574 1575 end: 1576 return is_hdmi; 1577 } 1578 1579 /** 1580 * drm_detect_monitor_audio - check monitor audio capability 1581 * 1582 * Monitor should have CEA extension block. 1583 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1584 * audio' only. If there is any audio extension block and supported 1585 * audio format, assume at least 'basic audio' support, even if 'basic 1586 * audio' is not defined in EDID. 1587 * 1588 */ 1589 bool drm_detect_monitor_audio(struct edid *edid) 1590 { 1591 u8 *edid_ext; 1592 int i, j; 1593 bool has_audio = false; 1594 int start_offset, end_offset; 1595 1596 edid_ext = drm_find_cea_extension(edid); 1597 if (!edid_ext) 1598 goto end; 1599 1600 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1601 1602 if (has_audio) { 1603 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1604 goto end; 1605 } 1606 1607 /* Data block offset in CEA extension block */ 1608 start_offset = 4; 1609 end_offset = edid_ext[2]; 1610 1611 for (i = start_offset; i < end_offset; 1612 i += ((edid_ext[i] & 0x1f) + 1)) { 1613 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1614 has_audio = true; 1615 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1616 DRM_DEBUG_KMS("CEA audio format %d\n", 1617 (edid_ext[i + j] >> 3) & 0xf); 1618 goto end; 1619 } 1620 } 1621 end: 1622 return has_audio; 1623 } 1624 1625 /** 1626 * drm_add_display_info - pull display info out if present 1627 * @edid: EDID data 1628 * @info: display info (attached to connector) 1629 * 1630 * Grab any available display info and stuff it into the drm_display_info 1631 * structure that's part of the connector. Useful for tracking bpp and 1632 * color spaces. 1633 */ 1634 static void drm_add_display_info(struct edid *edid, 1635 struct drm_display_info *info) 1636 { 1637 u8 *edid_ext; 1638 1639 info->width_mm = edid->width_cm * 10; 1640 info->height_mm = edid->height_cm * 10; 1641 1642 /* driver figures it out in this case */ 1643 info->bpc = 0; 1644 info->color_formats = 0; 1645 1646 /* Only defined for 1.4 with digital displays */ 1647 if (edid->revision < 4) 1648 return; 1649 1650 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1651 return; 1652 1653 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1654 case DRM_EDID_DIGITAL_DEPTH_6: 1655 info->bpc = 6; 1656 break; 1657 case DRM_EDID_DIGITAL_DEPTH_8: 1658 info->bpc = 8; 1659 break; 1660 case DRM_EDID_DIGITAL_DEPTH_10: 1661 info->bpc = 10; 1662 break; 1663 case DRM_EDID_DIGITAL_DEPTH_12: 1664 info->bpc = 12; 1665 break; 1666 case DRM_EDID_DIGITAL_DEPTH_14: 1667 info->bpc = 14; 1668 break; 1669 case DRM_EDID_DIGITAL_DEPTH_16: 1670 info->bpc = 16; 1671 break; 1672 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1673 default: 1674 info->bpc = 0; 1675 break; 1676 } 1677 1678 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1679 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1680 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1681 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1682 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1683 1684 /* Get data from CEA blocks if present */ 1685 edid_ext = drm_find_cea_extension(edid); 1686 if (!edid_ext) 1687 return; 1688 1689 info->cea_rev = edid_ext[1]; 1690 } 1691 1692 /** 1693 * drm_add_edid_modes - add modes from EDID data, if available 1694 * @connector: connector we're probing 1695 * @edid: edid data 1696 * 1697 * Add the specified modes to the connector's mode list. 1698 * 1699 * Return number of modes added or 0 if we couldn't find any. 1700 */ 1701 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1702 { 1703 int num_modes = 0; 1704 u32 quirks; 1705 1706 if (edid == NULL) { 1707 return 0; 1708 } 1709 if (!drm_edid_is_valid(edid)) { 1710 device_printf(connector->dev->device, "%s: EDID invalid.\n", 1711 drm_get_connector_name(connector)); 1712 return 0; 1713 } 1714 1715 quirks = edid_get_quirks(edid); 1716 1717 /* 1718 * EDID spec says modes should be preferred in this order: 1719 * - preferred detailed mode 1720 * - other detailed modes from base block 1721 * - detailed modes from extension blocks 1722 * - CVT 3-byte code modes 1723 * - standard timing codes 1724 * - established timing codes 1725 * - modes inferred from GTF or CVT range information 1726 * 1727 * We get this pretty much right. 1728 * 1729 * XXX order for additional mode types in extension blocks? 1730 */ 1731 num_modes += add_detailed_modes(connector, edid, quirks); 1732 num_modes += add_cvt_modes(connector, edid); 1733 num_modes += add_standard_modes(connector, edid); 1734 num_modes += add_established_modes(connector, edid); 1735 num_modes += add_inferred_modes(connector, edid); 1736 1737 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1738 edid_fixup_preferred(connector, quirks); 1739 1740 drm_add_display_info(edid, &connector->display_info); 1741 1742 return num_modes; 1743 } 1744 1745 /** 1746 * drm_add_modes_noedid - add modes for the connectors without EDID 1747 * @connector: connector we're probing 1748 * @hdisplay: the horizontal display limit 1749 * @vdisplay: the vertical display limit 1750 * 1751 * Add the specified modes to the connector's mode list. Only when the 1752 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1753 * 1754 * Return number of modes added or 0 if we couldn't find any. 1755 */ 1756 int drm_add_modes_noedid(struct drm_connector *connector, 1757 int hdisplay, int vdisplay) 1758 { 1759 int i, count, num_modes = 0; 1760 struct drm_display_mode *mode; 1761 struct drm_device *dev = connector->dev; 1762 1763 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1764 if (hdisplay < 0) 1765 hdisplay = 0; 1766 if (vdisplay < 0) 1767 vdisplay = 0; 1768 1769 for (i = 0; i < count; i++) { 1770 struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1771 if (hdisplay && vdisplay) { 1772 /* 1773 * Only when two are valid, they will be used to check 1774 * whether the mode should be added to the mode list of 1775 * the connector. 1776 */ 1777 if (ptr->hdisplay > hdisplay || 1778 ptr->vdisplay > vdisplay) 1779 continue; 1780 } 1781 if (drm_mode_vrefresh(ptr) > 61) 1782 continue; 1783 mode = drm_mode_duplicate(dev, ptr); 1784 if (mode) { 1785 drm_mode_probed_add(connector, mode); 1786 num_modes++; 1787 } 1788 } 1789 return num_modes; 1790 } 1791