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 EXPORT_SYMBOL(drm_edid_header_is_valid); 150 151 static int edid_fixup __read_mostly = 6; 152 153 /* 154 * Sanity check the EDID block (base or extension). Return 0 if the block 155 * doesn't check out, or 1 if it's valid. 156 */ 157 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid) 158 { 159 int i; 160 u8 csum = 0; 161 struct edid *edid = (struct edid *)raw_edid; 162 163 if (edid_fixup > 8 || edid_fixup < 0) 164 edid_fixup = 6; 165 166 if (block == 0) { 167 int score = drm_edid_header_is_valid(raw_edid); 168 if (score == 8) ; 169 else if (score >= edid_fixup) { 170 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 171 memcpy(raw_edid, edid_header, sizeof(edid_header)); 172 } else { 173 goto bad; 174 } 175 } 176 177 for (i = 0; i < EDID_LENGTH; i++) 178 csum += raw_edid[i]; 179 if (csum) { 180 if (print_bad_edid) { 181 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 182 } 183 184 /* allow CEA to slide through, switches mangle this */ 185 if (raw_edid[0] != 0x02) 186 goto bad; 187 } 188 189 /* per-block-type checks */ 190 switch (raw_edid[0]) { 191 case 0: /* base */ 192 if (edid->version != 1) { 193 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 194 goto bad; 195 } 196 197 if (edid->revision > 4) 198 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 199 break; 200 201 default: 202 break; 203 } 204 205 return 1; 206 207 bad: 208 if (raw_edid && print_bad_edid) { 209 DRM_DEBUG_KMS("Raw EDID:\n"); 210 if ((drm_debug & DRM_DEBUGBITS_KMS) != 0) { 211 for (i = 0; i < EDID_LENGTH; ) { 212 kprintf("%02x", raw_edid[i]); 213 i++; 214 if (i % 16 == 0 || i == EDID_LENGTH) 215 kprintf("\n"); 216 else if (i % 8 == 0) 217 kprintf(" "); 218 else 219 kprintf(" "); 220 } 221 } 222 } 223 return 0; 224 } 225 EXPORT_SYMBOL(drm_edid_block_valid); 226 227 /** 228 * drm_edid_is_valid - sanity check EDID data 229 * @edid: EDID data 230 * 231 * Sanity-check an entire EDID record (including extensions) 232 */ 233 bool drm_edid_is_valid(struct edid *edid) 234 { 235 int i; 236 u8 *raw = (u8 *)edid; 237 238 if (!edid) 239 return false; 240 241 for (i = 0; i <= edid->extensions; i++) 242 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true)) 243 return false; 244 245 return true; 246 } 247 EXPORT_SYMBOL(drm_edid_is_valid); 248 249 #define DDC_ADDR 0x50 250 #define DDC_SEGMENT_ADDR 0x30 251 /** 252 * Get EDID information via I2C. 253 * 254 * \param adapter : i2c device adaptor 255 * \param buf : EDID data buffer to be filled 256 * \param len : EDID data buffer length 257 * \return 0 on success or -1 on failure. 258 * 259 * Try to fetch EDID information by calling i2c driver function. 260 */ 261 static int 262 drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf, 263 int block, int len) 264 { 265 unsigned char start = block * EDID_LENGTH; 266 unsigned char segment = block >> 1; 267 unsigned char xfers = segment ? 3 : 2; 268 int ret, retries = 5; 269 270 /* The core i2c driver will automatically retry the transfer if the 271 * adapter reports EAGAIN. However, we find that bit-banging transfers 272 * are susceptible to errors under a heavily loaded machine and 273 * generate spurious NAKs and timeouts. Retrying the transfer 274 * of the individual block a few times seems to overcome this. 275 */ 276 do { 277 struct iic_msg msgs[] = { 278 { 279 .slave = DDC_SEGMENT_ADDR << 1, 280 .flags = 0, 281 .len = 1, 282 .buf = &segment, 283 }, { 284 .slave = DDC_ADDR << 1, 285 .flags = IIC_M_WR, 286 .len = 1, 287 .buf = &start, 288 }, { 289 .slave = DDC_ADDR << 1, 290 .flags = IIC_M_RD, 291 .len = len, 292 .buf = buf, 293 } 294 }; 295 296 /* 297 * Avoid sending the segment addr to not upset non-compliant ddc 298 * monitors. 299 */ 300 ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers); 301 302 if (ret != 0) 303 DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n", 304 retries, ret); 305 } while (ret != 0 && --retries); 306 307 return (ret == 0 ? 0 : -1); 308 } 309 310 static bool drm_edid_is_zero(u8 *in_edid, int length) 311 { 312 int i; 313 u32 *raw_edid = (u32 *)in_edid; 314 315 for (i = 0; i < length / 4; i++) 316 if (*(raw_edid + i) != 0) 317 return false; 318 return true; 319 } 320 321 static u8 * 322 drm_do_get_edid(struct drm_connector *connector, device_t adapter) 323 { 324 int i, j = 0, valid_extensions = 0; 325 u8 *block, *new; 326 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS); 327 328 block = kmalloc(EDID_LENGTH, DRM_MEM_KMS, M_WAITOK | M_ZERO); 329 330 /* base block fetch */ 331 for (i = 0; i < 4; i++) { 332 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 333 goto out; 334 if (drm_edid_block_valid(block, 0, print_bad_edid)) 335 break; 336 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 337 connector->null_edid_counter++; 338 goto carp; 339 } 340 } 341 if (i == 4) 342 goto carp; 343 344 /* if there's no extensions, we're done */ 345 if (block[0x7e] == 0) 346 return block; 347 348 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, DRM_MEM_KMS, 349 M_WAITOK); 350 if (!new) 351 goto out; 352 block = new; 353 354 for (j = 1; j <= block[0x7e]; j++) { 355 for (i = 0; i < 4; i++) { 356 if (drm_do_probe_ddc_edid(adapter, 357 block + (valid_extensions + 1) * EDID_LENGTH, 358 j, EDID_LENGTH)) 359 goto out; 360 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) { 361 valid_extensions++; 362 break; 363 } 364 } 365 if (i == 4) 366 dev_warn(connector->dev->dev, 367 "%s: Ignoring invalid EDID block %d.\n", 368 drm_get_connector_name(connector), j); 369 } 370 371 if (valid_extensions != block[0x7e]) { 372 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 373 block[0x7e] = valid_extensions; 374 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, 375 DRM_MEM_KMS, M_WAITOK); 376 if (!new) 377 goto out; 378 block = new; 379 } 380 381 return block; 382 383 carp: 384 if (print_bad_edid) { 385 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 386 drm_get_connector_name(connector), j); 387 } 388 connector->bad_edid_counter++; 389 390 out: 391 kfree(block, DRM_MEM_KMS); 392 return NULL; 393 } 394 395 /** 396 * Probe DDC presence. 397 * 398 * \param adapter : i2c device adaptor 399 * \return 1 on success 400 */ 401 bool 402 drm_probe_ddc(device_t adapter) 403 { 404 unsigned char out; 405 406 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 407 } 408 EXPORT_SYMBOL(drm_probe_ddc); 409 410 /** 411 * drm_get_edid - get EDID data, if available 412 * @connector: connector we're probing 413 * @adapter: i2c adapter to use for DDC 414 * 415 * Poke the given i2c channel to grab EDID data if possible. If found, 416 * attach it to the connector. 417 * 418 * Return edid data or NULL if we couldn't find any. 419 */ 420 struct edid *drm_get_edid(struct drm_connector *connector, 421 device_t adapter) 422 { 423 struct edid *edid = NULL; 424 425 if (drm_probe_ddc(adapter)) 426 edid = (struct edid *)drm_do_get_edid(connector, adapter); 427 428 return edid; 429 } 430 EXPORT_SYMBOL(drm_get_edid); 431 432 /*** EDID parsing ***/ 433 434 /** 435 * edid_vendor - match a string against EDID's obfuscated vendor field 436 * @edid: EDID to match 437 * @vendor: vendor string 438 * 439 * Returns true if @vendor is in @edid, false otherwise 440 */ 441 static bool edid_vendor(struct edid *edid, char *vendor) 442 { 443 char edid_vendor[3]; 444 445 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 446 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 447 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 448 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 449 450 return !strncmp(edid_vendor, vendor, 3); 451 } 452 453 /** 454 * edid_get_quirks - return quirk flags for a given EDID 455 * @edid: EDID to process 456 * 457 * This tells subsequent routines what fixes they need to apply. 458 */ 459 static u32 edid_get_quirks(struct edid *edid) 460 { 461 struct edid_quirk *quirk; 462 int i; 463 464 for (i = 0; i < DRM_ARRAY_SIZE(edid_quirk_list); i++) { 465 quirk = &edid_quirk_list[i]; 466 467 if (edid_vendor(edid, quirk->vendor) && 468 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 469 return quirk->quirks; 470 } 471 472 return 0; 473 } 474 475 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 476 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 477 478 /** 479 * edid_fixup_preferred - set preferred modes based on quirk list 480 * @connector: has mode list to fix up 481 * @quirks: quirks list 482 * 483 * Walk the mode list for @connector, clearing the preferred status 484 * on existing modes and setting it anew for the right mode ala @quirks. 485 */ 486 static void edid_fixup_preferred(struct drm_connector *connector, 487 u32 quirks) 488 { 489 struct drm_display_mode *t, *cur_mode, *preferred_mode; 490 int target_refresh = 0; 491 492 if (list_empty(&connector->probed_modes)) 493 return; 494 495 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 496 target_refresh = 60; 497 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 498 target_refresh = 75; 499 500 preferred_mode = list_first_entry(&connector->probed_modes, 501 struct drm_display_mode, head); 502 503 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 504 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 505 506 if (cur_mode == preferred_mode) 507 continue; 508 509 /* Largest mode is preferred */ 510 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 511 preferred_mode = cur_mode; 512 513 /* At a given size, try to get closest to target refresh */ 514 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 515 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 516 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 517 preferred_mode = cur_mode; 518 } 519 } 520 521 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 522 } 523 524 static bool 525 mode_is_rb(const struct drm_display_mode *mode) 526 { 527 return (mode->htotal - mode->hdisplay == 160) && 528 (mode->hsync_end - mode->hdisplay == 80) && 529 (mode->hsync_end - mode->hsync_start == 32) && 530 (mode->vsync_start - mode->vdisplay == 3); 531 } 532 533 /* 534 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 535 * @dev: Device to duplicate against 536 * @hsize: Mode width 537 * @vsize: Mode height 538 * @fresh: Mode refresh rate 539 * @rb: Mode reduced-blanking-ness 540 * 541 * Walk the DMT mode list looking for a match for the given parameters. 542 * Return a newly allocated copy of the mode, or NULL if not found. 543 */ 544 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 545 int hsize, int vsize, int fresh, 546 bool rb) 547 { 548 int i; 549 550 for (i = 0; i < drm_num_dmt_modes; i++) { 551 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 552 if (hsize != ptr->hdisplay) 553 continue; 554 if (vsize != ptr->vdisplay) 555 continue; 556 if (fresh != drm_mode_vrefresh(ptr)) 557 continue; 558 if (rb != mode_is_rb(ptr)) 559 continue; 560 561 return drm_mode_duplicate(dev, ptr); 562 } 563 564 return NULL; 565 } 566 EXPORT_SYMBOL(drm_mode_find_dmt); 567 568 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 569 570 static void 571 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 572 { 573 int i, n = 0; 574 u8 d = ext[0x02]; 575 u8 *det_base = ext + d; 576 577 n = (127 - d) / 18; 578 for (i = 0; i < n; i++) 579 cb((struct detailed_timing *)(det_base + 18 * i), closure); 580 } 581 582 static void 583 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 584 { 585 unsigned int i, n = min((int)ext[0x02], 6); 586 u8 *det_base = ext + 5; 587 588 if (ext[0x01] != 1) 589 return; /* unknown version */ 590 591 for (i = 0; i < n; i++) 592 cb((struct detailed_timing *)(det_base + 18 * i), closure); 593 } 594 595 static void 596 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 597 { 598 int i; 599 struct edid *edid = (struct edid *)raw_edid; 600 601 if (edid == NULL) 602 return; 603 604 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 605 cb(&(edid->detailed_timings[i]), closure); 606 607 for (i = 1; i <= raw_edid[0x7e]; i++) { 608 u8 *ext = raw_edid + (i * EDID_LENGTH); 609 switch (*ext) { 610 case CEA_EXT: 611 cea_for_each_detailed_block(ext, cb, closure); 612 break; 613 case VTB_EXT: 614 vtb_for_each_detailed_block(ext, cb, closure); 615 break; 616 default: 617 break; 618 } 619 } 620 } 621 622 static void 623 is_rb(struct detailed_timing *t, void *data) 624 { 625 u8 *r = (u8 *)t; 626 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 627 if (r[15] & 0x10) 628 *(bool *)data = true; 629 } 630 631 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 632 static bool 633 drm_monitor_supports_rb(struct edid *edid) 634 { 635 if (edid->revision >= 4) { 636 bool ret; 637 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 638 return ret; 639 } 640 641 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 642 } 643 644 static void 645 find_gtf2(struct detailed_timing *t, void *data) 646 { 647 u8 *r = (u8 *)t; 648 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 649 *(u8 **)data = r; 650 } 651 652 /* Secondary GTF curve kicks in above some break frequency */ 653 static int 654 drm_gtf2_hbreak(struct edid *edid) 655 { 656 u8 *r = NULL; 657 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 658 return r ? (r[12] * 2) : 0; 659 } 660 661 static int 662 drm_gtf2_2c(struct edid *edid) 663 { 664 u8 *r = NULL; 665 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 666 return r ? r[13] : 0; 667 } 668 669 static int 670 drm_gtf2_m(struct edid *edid) 671 { 672 u8 *r = NULL; 673 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 674 return r ? (r[15] << 8) + r[14] : 0; 675 } 676 677 static int 678 drm_gtf2_k(struct edid *edid) 679 { 680 u8 *r = NULL; 681 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 682 return r ? r[16] : 0; 683 } 684 685 static int 686 drm_gtf2_2j(struct edid *edid) 687 { 688 u8 *r = NULL; 689 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 690 return r ? r[17] : 0; 691 } 692 693 /** 694 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 695 * @edid: EDID block to scan 696 */ 697 static int standard_timing_level(struct edid *edid) 698 { 699 if (edid->revision >= 2) { 700 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 701 return LEVEL_CVT; 702 if (drm_gtf2_hbreak(edid)) 703 return LEVEL_GTF2; 704 return LEVEL_GTF; 705 } 706 return LEVEL_DMT; 707 } 708 709 /* 710 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 711 * monitors fill with ascii space (0x20) instead. 712 */ 713 static int 714 bad_std_timing(u8 a, u8 b) 715 { 716 return (a == 0x00 && b == 0x00) || 717 (a == 0x01 && b == 0x01) || 718 (a == 0x20 && b == 0x20); 719 } 720 721 /** 722 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 723 * @t: standard timing params 724 * @timing_level: standard timing level 725 * 726 * Take the standard timing params (in this case width, aspect, and refresh) 727 * and convert them into a real mode using CVT/GTF/DMT. 728 */ 729 static struct drm_display_mode * 730 drm_mode_std(struct drm_connector *connector, struct edid *edid, 731 struct std_timing *t, int revision) 732 { 733 struct drm_device *dev = connector->dev; 734 struct drm_display_mode *m, *mode = NULL; 735 int hsize, vsize; 736 int vrefresh_rate; 737 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 738 >> EDID_TIMING_ASPECT_SHIFT; 739 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 740 >> EDID_TIMING_VFREQ_SHIFT; 741 int timing_level = standard_timing_level(edid); 742 743 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 744 return NULL; 745 746 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 747 hsize = t->hsize * 8 + 248; 748 /* vrefresh_rate = vfreq + 60 */ 749 vrefresh_rate = vfreq + 60; 750 /* the vdisplay is calculated based on the aspect ratio */ 751 if (aspect_ratio == 0) { 752 if (revision < 3) 753 vsize = hsize; 754 else 755 vsize = (hsize * 10) / 16; 756 } else if (aspect_ratio == 1) 757 vsize = (hsize * 3) / 4; 758 else if (aspect_ratio == 2) 759 vsize = (hsize * 4) / 5; 760 else 761 vsize = (hsize * 9) / 16; 762 763 /* HDTV hack, part 1 */ 764 if (vrefresh_rate == 60 && 765 ((hsize == 1360 && vsize == 765) || 766 (hsize == 1368 && vsize == 769))) { 767 hsize = 1366; 768 vsize = 768; 769 } 770 771 /* 772 * If this connector already has a mode for this size and refresh 773 * rate (because it came from detailed or CVT info), use that 774 * instead. This way we don't have to guess at interlace or 775 * reduced blanking. 776 */ 777 list_for_each_entry(m, &connector->probed_modes, head) 778 if (m->hdisplay == hsize && m->vdisplay == vsize && 779 drm_mode_vrefresh(m) == vrefresh_rate) 780 return NULL; 781 782 /* HDTV hack, part 2 */ 783 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 784 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 785 false); 786 mode->hdisplay = 1366; 787 mode->hsync_start = mode->hsync_start - 1; 788 mode->hsync_end = mode->hsync_end - 1; 789 return mode; 790 } 791 792 /* check whether it can be found in default mode table */ 793 if (drm_monitor_supports_rb(edid)) { 794 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, 795 true); 796 if (mode) 797 return mode; 798 } 799 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false); 800 if (mode) 801 return mode; 802 803 /* okay, generate it */ 804 switch (timing_level) { 805 case LEVEL_DMT: 806 break; 807 case LEVEL_GTF: 808 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 809 break; 810 case LEVEL_GTF2: 811 /* 812 * This is potentially wrong if there's ever a monitor with 813 * more than one ranges section, each claiming a different 814 * secondary GTF curve. Please don't do that. 815 */ 816 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 817 if (!mode) 818 return NULL; 819 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 820 drm_mode_destroy(dev, mode); 821 mode = drm_gtf_mode_complex(dev, hsize, vsize, 822 vrefresh_rate, 0, 0, 823 drm_gtf2_m(edid), 824 drm_gtf2_2c(edid), 825 drm_gtf2_k(edid), 826 drm_gtf2_2j(edid)); 827 } 828 break; 829 case LEVEL_CVT: 830 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 831 false); 832 break; 833 } 834 return mode; 835 } 836 837 /* 838 * EDID is delightfully ambiguous about how interlaced modes are to be 839 * encoded. Our internal representation is of frame height, but some 840 * HDTV detailed timings are encoded as field height. 841 * 842 * The format list here is from CEA, in frame size. Technically we 843 * should be checking refresh rate too. Whatever. 844 */ 845 static void 846 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 847 struct detailed_pixel_timing *pt) 848 { 849 int i; 850 static const struct { 851 int w, h; 852 } cea_interlaced[] = { 853 { 1920, 1080 }, 854 { 720, 480 }, 855 { 1440, 480 }, 856 { 2880, 480 }, 857 { 720, 576 }, 858 { 1440, 576 }, 859 { 2880, 576 }, 860 }; 861 862 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 863 return; 864 865 for (i = 0; i < DRM_ARRAY_SIZE(cea_interlaced); i++) { 866 if ((mode->hdisplay == cea_interlaced[i].w) && 867 (mode->vdisplay == cea_interlaced[i].h / 2)) { 868 mode->vdisplay *= 2; 869 mode->vsync_start *= 2; 870 mode->vsync_end *= 2; 871 mode->vtotal *= 2; 872 mode->vtotal |= 1; 873 } 874 } 875 876 mode->flags |= DRM_MODE_FLAG_INTERLACE; 877 } 878 879 /** 880 * drm_mode_detailed - create a new mode from an EDID detailed timing section 881 * @dev: DRM device (needed to create new mode) 882 * @edid: EDID block 883 * @timing: EDID detailed timing info 884 * @quirks: quirks to apply 885 * 886 * An EDID detailed timing block contains enough info for us to create and 887 * return a new struct drm_display_mode. 888 */ 889 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 890 struct edid *edid, 891 struct detailed_timing *timing, 892 u32 quirks) 893 { 894 struct drm_display_mode *mode; 895 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 896 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 897 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 898 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 899 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 900 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 901 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 902 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 903 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 904 905 /* ignore tiny modes */ 906 if (hactive < 64 || vactive < 64) 907 return NULL; 908 909 if (pt->misc & DRM_EDID_PT_STEREO) { 910 kprintf("stereo mode not supported\n"); 911 return NULL; 912 } 913 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 914 kprintf("composite sync not supported\n"); 915 } 916 917 /* it is incorrect if hsync/vsync width is zero */ 918 if (!hsync_pulse_width || !vsync_pulse_width) { 919 DRM_DEBUG_KMS("Incorrect Detailed timing. " 920 "Wrong Hsync/Vsync pulse width\n"); 921 return NULL; 922 } 923 mode = drm_mode_create(dev); 924 if (!mode) 925 return NULL; 926 927 mode->type = DRM_MODE_TYPE_DRIVER; 928 929 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 930 timing->pixel_clock = htole16(1088); 931 932 mode->clock = le16toh(timing->pixel_clock) * 10; 933 934 mode->hdisplay = hactive; 935 mode->hsync_start = mode->hdisplay + hsync_offset; 936 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 937 mode->htotal = mode->hdisplay + hblank; 938 939 mode->vdisplay = vactive; 940 mode->vsync_start = mode->vdisplay + vsync_offset; 941 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 942 mode->vtotal = mode->vdisplay + vblank; 943 944 /* Some EDIDs have bogus h/vtotal values */ 945 if (mode->hsync_end > mode->htotal) 946 mode->htotal = mode->hsync_end + 1; 947 if (mode->vsync_end > mode->vtotal) 948 mode->vtotal = mode->vsync_end + 1; 949 950 drm_mode_do_interlace_quirk(mode, pt); 951 952 drm_mode_set_name(mode); 953 954 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 955 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 956 } 957 958 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 959 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 960 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 961 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 962 963 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 964 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 965 966 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 967 mode->width_mm *= 10; 968 mode->height_mm *= 10; 969 } 970 971 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 972 mode->width_mm = edid->width_cm * 10; 973 mode->height_mm = edid->height_cm * 10; 974 } 975 976 return mode; 977 } 978 979 static bool 980 mode_in_hsync_range(const struct drm_display_mode *mode, 981 struct edid *edid, u8 *t) 982 { 983 int hsync, hmin, hmax; 984 985 hmin = t[7]; 986 if (edid->revision >= 4) 987 hmin += ((t[4] & 0x04) ? 255 : 0); 988 hmax = t[8]; 989 if (edid->revision >= 4) 990 hmax += ((t[4] & 0x08) ? 255 : 0); 991 hsync = drm_mode_hsync(mode); 992 993 return (hsync <= hmax && hsync >= hmin); 994 } 995 996 static bool 997 mode_in_vsync_range(const struct drm_display_mode *mode, 998 struct edid *edid, u8 *t) 999 { 1000 int vsync, vmin, vmax; 1001 1002 vmin = t[5]; 1003 if (edid->revision >= 4) 1004 vmin += ((t[4] & 0x01) ? 255 : 0); 1005 vmax = t[6]; 1006 if (edid->revision >= 4) 1007 vmax += ((t[4] & 0x02) ? 255 : 0); 1008 vsync = drm_mode_vrefresh(mode); 1009 1010 return (vsync <= vmax && vsync >= vmin); 1011 } 1012 1013 static u32 1014 range_pixel_clock(struct edid *edid, u8 *t) 1015 { 1016 /* unspecified */ 1017 if (t[9] == 0 || t[9] == 255) 1018 return 0; 1019 1020 /* 1.4 with CVT support gives us real precision, yay */ 1021 if (edid->revision >= 4 && t[10] == 0x04) 1022 return (t[9] * 10000) - ((t[12] >> 2) * 250); 1023 1024 /* 1.3 is pathetic, so fuzz up a bit */ 1025 return t[9] * 10000 + 5001; 1026 } 1027 1028 static bool 1029 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 1030 struct detailed_timing *timing) 1031 { 1032 u32 max_clock; 1033 u8 *t = (u8 *)timing; 1034 1035 if (!mode_in_hsync_range(mode, edid, t)) 1036 return false; 1037 1038 if (!mode_in_vsync_range(mode, edid, t)) 1039 return false; 1040 1041 if ((max_clock = range_pixel_clock(edid, t))) 1042 if (mode->clock > max_clock) 1043 return false; 1044 1045 /* 1.4 max horizontal check */ 1046 if (edid->revision >= 4 && t[10] == 0x04) 1047 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1048 return false; 1049 1050 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1051 return false; 1052 1053 return true; 1054 } 1055 1056 /* 1057 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 1058 * need to account for them. 1059 */ 1060 static int 1061 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1062 struct detailed_timing *timing) 1063 { 1064 int i, modes = 0; 1065 struct drm_display_mode *newmode; 1066 struct drm_device *dev = connector->dev; 1067 1068 for (i = 0; i < drm_num_dmt_modes; i++) { 1069 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1070 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1071 if (newmode) { 1072 drm_mode_probed_add(connector, newmode); 1073 modes++; 1074 } 1075 } 1076 } 1077 1078 return modes; 1079 } 1080 1081 static void 1082 do_inferred_modes(struct detailed_timing *timing, void *c) 1083 { 1084 struct detailed_mode_closure *closure = c; 1085 struct detailed_non_pixel *data = &timing->data.other_data; 1086 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1087 1088 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1089 closure->modes += drm_gtf_modes_for_range(closure->connector, 1090 closure->edid, 1091 timing); 1092 } 1093 1094 static int 1095 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1096 { 1097 struct detailed_mode_closure closure = { 1098 connector, edid, 0, 0, 0 1099 }; 1100 1101 if (version_greater(edid, 1, 0)) 1102 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1103 &closure); 1104 1105 return closure.modes; 1106 } 1107 1108 static int 1109 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1110 { 1111 int i, j, m, modes = 0; 1112 struct drm_display_mode *mode; 1113 u8 *est = ((u8 *)timing) + 5; 1114 1115 for (i = 0; i < 6; i++) { 1116 for (j = 7; j > 0; j--) { 1117 m = (i * 8) + (7 - j); 1118 if (m >= ARRAY_SIZE(est3_modes)) 1119 break; 1120 if (est[i] & (1 << j)) { 1121 mode = drm_mode_find_dmt(connector->dev, 1122 est3_modes[m].w, 1123 est3_modes[m].h, 1124 est3_modes[m].r, 1125 est3_modes[m].rb); 1126 if (mode) { 1127 drm_mode_probed_add(connector, mode); 1128 modes++; 1129 } 1130 } 1131 } 1132 } 1133 1134 return modes; 1135 } 1136 1137 static void 1138 do_established_modes(struct detailed_timing *timing, void *c) 1139 { 1140 struct detailed_mode_closure *closure = c; 1141 struct detailed_non_pixel *data = &timing->data.other_data; 1142 1143 if (data->type == EDID_DETAIL_EST_TIMINGS) 1144 closure->modes += drm_est3_modes(closure->connector, timing); 1145 } 1146 1147 /** 1148 * add_established_modes - get est. modes from EDID and add them 1149 * @edid: EDID block to scan 1150 * 1151 * Each EDID block contains a bitmap of the supported "established modes" list 1152 * (defined above). Tease them out and add them to the global modes list. 1153 */ 1154 static int 1155 add_established_modes(struct drm_connector *connector, struct edid *edid) 1156 { 1157 struct drm_device *dev = connector->dev; 1158 unsigned long est_bits = edid->established_timings.t1 | 1159 (edid->established_timings.t2 << 8) | 1160 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1161 int i, modes = 0; 1162 struct detailed_mode_closure closure = { 1163 connector, edid, 0, 0, 0 1164 }; 1165 1166 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1167 if (est_bits & (1<<i)) { 1168 struct drm_display_mode *newmode; 1169 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1170 if (newmode) { 1171 drm_mode_probed_add(connector, newmode); 1172 modes++; 1173 } 1174 } 1175 } 1176 1177 if (version_greater(edid, 1, 0)) 1178 drm_for_each_detailed_block((u8 *)edid, 1179 do_established_modes, &closure); 1180 1181 return modes + closure.modes; 1182 } 1183 1184 static void 1185 do_standard_modes(struct detailed_timing *timing, void *c) 1186 { 1187 struct detailed_mode_closure *closure = c; 1188 struct detailed_non_pixel *data = &timing->data.other_data; 1189 struct drm_connector *connector = closure->connector; 1190 struct edid *edid = closure->edid; 1191 1192 if (data->type == EDID_DETAIL_STD_MODES) { 1193 int i; 1194 for (i = 0; i < 6; i++) { 1195 struct std_timing *std; 1196 struct drm_display_mode *newmode; 1197 1198 std = &data->data.timings[i]; 1199 newmode = drm_mode_std(connector, edid, std, 1200 edid->revision); 1201 if (newmode) { 1202 drm_mode_probed_add(connector, newmode); 1203 closure->modes++; 1204 } 1205 } 1206 } 1207 } 1208 1209 /** 1210 * add_standard_modes - get std. modes from EDID and add them 1211 * @edid: EDID block to scan 1212 * 1213 * Standard modes can be calculated using the appropriate standard (DMT, 1214 * GTF or CVT. Grab them from @edid and add them to the list. 1215 */ 1216 static int 1217 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1218 { 1219 int i, modes = 0; 1220 struct detailed_mode_closure closure = { 1221 connector, edid, 0, 0, 0 1222 }; 1223 1224 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1225 struct drm_display_mode *newmode; 1226 1227 newmode = drm_mode_std(connector, edid, 1228 &edid->standard_timings[i], 1229 edid->revision); 1230 if (newmode) { 1231 drm_mode_probed_add(connector, newmode); 1232 modes++; 1233 } 1234 } 1235 1236 if (version_greater(edid, 1, 0)) 1237 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1238 &closure); 1239 1240 /* XXX should also look for standard codes in VTB blocks */ 1241 1242 return modes + closure.modes; 1243 } 1244 1245 static int drm_cvt_modes(struct drm_connector *connector, 1246 struct detailed_timing *timing) 1247 { 1248 int i, j, modes = 0; 1249 struct drm_display_mode *newmode; 1250 struct drm_device *dev = connector->dev; 1251 struct cvt_timing *cvt; 1252 const int rates[] = { 60, 85, 75, 60, 50 }; 1253 const u8 empty[3] = { 0, 0, 0 }; 1254 1255 for (i = 0; i < 4; i++) { 1256 int width = 0, height; 1257 cvt = &(timing->data.other_data.data.cvt[i]); 1258 1259 if (!memcmp(cvt->code, empty, 3)) 1260 continue; 1261 1262 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1263 switch (cvt->code[1] & 0x0c) { 1264 case 0x00: 1265 width = height * 4 / 3; 1266 break; 1267 case 0x04: 1268 width = height * 16 / 9; 1269 break; 1270 case 0x08: 1271 width = height * 16 / 10; 1272 break; 1273 case 0x0c: 1274 width = height * 15 / 9; 1275 break; 1276 } 1277 1278 for (j = 1; j < 5; j++) { 1279 if (cvt->code[2] & (1 << j)) { 1280 newmode = drm_cvt_mode(dev, width, height, 1281 rates[j], j == 0, 1282 false, false); 1283 if (newmode) { 1284 drm_mode_probed_add(connector, newmode); 1285 modes++; 1286 } 1287 } 1288 } 1289 } 1290 1291 return modes; 1292 } 1293 1294 static void 1295 do_cvt_mode(struct detailed_timing *timing, void *c) 1296 { 1297 struct detailed_mode_closure *closure = c; 1298 struct detailed_non_pixel *data = &timing->data.other_data; 1299 1300 if (data->type == EDID_DETAIL_CVT_3BYTE) 1301 closure->modes += drm_cvt_modes(closure->connector, timing); 1302 } 1303 1304 static int 1305 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1306 { 1307 struct detailed_mode_closure closure = { 1308 connector, edid, 0, 0, 0 1309 }; 1310 1311 if (version_greater(edid, 1, 2)) 1312 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1313 1314 /* XXX should also look for CVT codes in VTB blocks */ 1315 1316 return closure.modes; 1317 } 1318 1319 static void 1320 do_detailed_mode(struct detailed_timing *timing, void *c) 1321 { 1322 struct detailed_mode_closure *closure = c; 1323 struct drm_display_mode *newmode; 1324 1325 if (timing->pixel_clock) { 1326 newmode = drm_mode_detailed(closure->connector->dev, 1327 closure->edid, timing, 1328 closure->quirks); 1329 if (!newmode) 1330 return; 1331 1332 if (closure->preferred) 1333 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1334 1335 drm_mode_probed_add(closure->connector, newmode); 1336 closure->modes++; 1337 closure->preferred = 0; 1338 } 1339 } 1340 1341 /* 1342 * add_detailed_modes - Add modes from detailed timings 1343 * @connector: attached connector 1344 * @edid: EDID block to scan 1345 * @quirks: quirks to apply 1346 */ 1347 static int 1348 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1349 u32 quirks) 1350 { 1351 struct detailed_mode_closure closure = { 1352 connector, 1353 edid, 1354 1, 1355 quirks, 1356 0 1357 }; 1358 1359 if (closure.preferred && !version_greater(edid, 1, 3)) 1360 closure.preferred = 1361 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1362 1363 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1364 1365 return closure.modes; 1366 } 1367 1368 #define HDMI_IDENTIFIER 0x000C03 1369 #define AUDIO_BLOCK 0x01 1370 #define VENDOR_BLOCK 0x03 1371 #define SPEAKER_BLOCK 0x04 1372 #define EDID_BASIC_AUDIO (1 << 6) 1373 1374 /** 1375 * Search EDID for CEA extension block. 1376 */ 1377 u8 *drm_find_cea_extension(struct edid *edid) 1378 { 1379 u8 *edid_ext = NULL; 1380 int i; 1381 1382 /* No EDID or EDID extensions */ 1383 if (edid == NULL || edid->extensions == 0) 1384 return NULL; 1385 1386 /* Find CEA extension */ 1387 for (i = 0; i < edid->extensions; i++) { 1388 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1389 if (edid_ext[0] == CEA_EXT) 1390 break; 1391 } 1392 1393 if (i == edid->extensions) 1394 return NULL; 1395 1396 return edid_ext; 1397 } 1398 EXPORT_SYMBOL(drm_find_cea_extension); 1399 1400 static void 1401 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1402 { 1403 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1404 1405 connector->dvi_dual = db[6] & 1; 1406 connector->max_tmds_clock = db[7] * 5; 1407 1408 connector->latency_present[0] = db[8] >> 7; 1409 connector->latency_present[1] = (db[8] >> 6) & 1; 1410 connector->video_latency[0] = db[9]; 1411 connector->audio_latency[0] = db[10]; 1412 connector->video_latency[1] = db[11]; 1413 connector->audio_latency[1] = db[12]; 1414 1415 DRM_DEBUG_KMS("HDMI: DVI dual %d, " 1416 "max TMDS clock %d, " 1417 "latency present %d %d, " 1418 "video latency %d %d, " 1419 "audio latency %d %d\n", 1420 connector->dvi_dual, 1421 connector->max_tmds_clock, 1422 (int) connector->latency_present[0], 1423 (int) connector->latency_present[1], 1424 connector->video_latency[0], 1425 connector->video_latency[1], 1426 connector->audio_latency[0], 1427 connector->audio_latency[1]); 1428 } 1429 1430 static void 1431 monitor_name(struct detailed_timing *t, void *data) 1432 { 1433 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1434 *(u8 **)data = t->data.other_data.data.str.str; 1435 } 1436 1437 /** 1438 * drm_edid_to_eld - build ELD from EDID 1439 * @connector: connector corresponding to the HDMI/DP sink 1440 * @edid: EDID to parse 1441 * 1442 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1443 * Some ELD fields are left to the graphics driver caller: 1444 * - Conn_Type 1445 * - HDCP 1446 * - Port_ID 1447 */ 1448 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1449 { 1450 uint8_t *eld = connector->eld; 1451 u8 *cea; 1452 u8 *name; 1453 u8 *db; 1454 int sad_count = 0; 1455 int mnl; 1456 int dbl; 1457 1458 memset(eld, 0, sizeof(connector->eld)); 1459 1460 cea = drm_find_cea_extension(edid); 1461 if (!cea) { 1462 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1463 return; 1464 } 1465 1466 name = NULL; 1467 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1468 for (mnl = 0; name && mnl < 13; mnl++) { 1469 if (name[mnl] == 0x0a) 1470 break; 1471 eld[20 + mnl] = name[mnl]; 1472 } 1473 eld[4] = (cea[1] << 5) | mnl; 1474 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1475 1476 eld[0] = 2 << 3; /* ELD version: 2 */ 1477 1478 eld[16] = edid->mfg_id[0]; 1479 eld[17] = edid->mfg_id[1]; 1480 eld[18] = edid->prod_code[0]; 1481 eld[19] = edid->prod_code[1]; 1482 1483 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1484 dbl = db[0] & 0x1f; 1485 1486 switch ((db[0] & 0xe0) >> 5) { 1487 case AUDIO_BLOCK: /* Audio Data Block, contains SADs */ 1488 sad_count = dbl / 3; 1489 memcpy(eld + 20 + mnl, &db[1], dbl); 1490 break; 1491 case SPEAKER_BLOCK: /* Speaker Allocation Data Block */ 1492 eld[7] = db[1]; 1493 break; 1494 case VENDOR_BLOCK: 1495 /* HDMI Vendor-Specific Data Block */ 1496 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1497 parse_hdmi_vsdb(connector, db); 1498 break; 1499 default: 1500 break; 1501 } 1502 } 1503 eld[5] |= sad_count << 4; 1504 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1505 1506 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1507 } 1508 1509 /** 1510 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1511 * @connector: connector associated with the HDMI/DP sink 1512 * @mode: the display mode 1513 */ 1514 int drm_av_sync_delay(struct drm_connector *connector, 1515 struct drm_display_mode *mode) 1516 { 1517 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1518 int a, v; 1519 1520 if (!connector->latency_present[0]) 1521 return 0; 1522 if (!connector->latency_present[1]) 1523 i = 0; 1524 1525 a = connector->audio_latency[i]; 1526 v = connector->video_latency[i]; 1527 1528 /* 1529 * HDMI/DP sink doesn't support audio or video? 1530 */ 1531 if (a == 255 || v == 255) 1532 return 0; 1533 1534 /* 1535 * Convert raw EDID values to millisecond. 1536 * Treat unknown latency as 0ms. 1537 */ 1538 if (a) 1539 a = min(2 * (a - 1), 500); 1540 if (v) 1541 v = min(2 * (v - 1), 500); 1542 1543 return max(v - a, 0); 1544 } 1545 1546 /** 1547 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1548 * @encoder: the encoder just changed display mode 1549 * @mode: the adjusted display mode 1550 * 1551 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1552 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1553 */ 1554 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1555 struct drm_display_mode *mode) 1556 { 1557 struct drm_connector *connector; 1558 struct drm_device *dev = encoder->dev; 1559 1560 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1561 if (connector->encoder == encoder && connector->eld[0]) 1562 return connector; 1563 1564 return NULL; 1565 } 1566 1567 /** 1568 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1569 * @edid: monitor EDID information 1570 * 1571 * Parse the CEA extension according to CEA-861-B. 1572 * Return true if HDMI, false if not or unknown. 1573 */ 1574 bool drm_detect_hdmi_monitor(struct edid *edid) 1575 { 1576 u8 *edid_ext; 1577 int i, hdmi_id; 1578 int start_offset, end_offset; 1579 bool is_hdmi = false; 1580 1581 edid_ext = drm_find_cea_extension(edid); 1582 if (!edid_ext) 1583 goto end; 1584 1585 /* Data block offset in CEA extension block */ 1586 start_offset = 4; 1587 end_offset = edid_ext[2]; 1588 1589 /* 1590 * Because HDMI identifier is in Vendor Specific Block, 1591 * search it from all data blocks of CEA extension. 1592 */ 1593 for (i = start_offset; i < end_offset; 1594 /* Increased by data block len */ 1595 i += ((edid_ext[i] & 0x1f) + 1)) { 1596 /* Find vendor specific block */ 1597 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1598 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1599 edid_ext[i + 3] << 16; 1600 /* Find HDMI identifier */ 1601 if (hdmi_id == HDMI_IDENTIFIER) 1602 is_hdmi = true; 1603 break; 1604 } 1605 } 1606 1607 end: 1608 return is_hdmi; 1609 } 1610 1611 /** 1612 * drm_detect_monitor_audio - check monitor audio capability 1613 * 1614 * Monitor should have CEA extension block. 1615 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1616 * audio' only. If there is any audio extension block and supported 1617 * audio format, assume at least 'basic audio' support, even if 'basic 1618 * audio' is not defined in EDID. 1619 * 1620 */ 1621 bool drm_detect_monitor_audio(struct edid *edid) 1622 { 1623 u8 *edid_ext; 1624 int i, j; 1625 bool has_audio = false; 1626 int start_offset, end_offset; 1627 1628 edid_ext = drm_find_cea_extension(edid); 1629 if (!edid_ext) 1630 goto end; 1631 1632 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1633 1634 if (has_audio) { 1635 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1636 goto end; 1637 } 1638 1639 /* Data block offset in CEA extension block */ 1640 start_offset = 4; 1641 end_offset = edid_ext[2]; 1642 1643 for (i = start_offset; i < end_offset; 1644 i += ((edid_ext[i] & 0x1f) + 1)) { 1645 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1646 has_audio = true; 1647 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1648 DRM_DEBUG_KMS("CEA audio format %d\n", 1649 (edid_ext[i + j] >> 3) & 0xf); 1650 goto end; 1651 } 1652 } 1653 end: 1654 return has_audio; 1655 } 1656 1657 /** 1658 * drm_add_display_info - pull display info out if present 1659 * @edid: EDID data 1660 * @info: display info (attached to connector) 1661 * 1662 * Grab any available display info and stuff it into the drm_display_info 1663 * structure that's part of the connector. Useful for tracking bpp and 1664 * color spaces. 1665 */ 1666 static void drm_add_display_info(struct edid *edid, 1667 struct drm_display_info *info) 1668 { 1669 u8 *edid_ext; 1670 1671 info->width_mm = edid->width_cm * 10; 1672 info->height_mm = edid->height_cm * 10; 1673 1674 /* driver figures it out in this case */ 1675 info->bpc = 0; 1676 info->color_formats = 0; 1677 1678 /* Only defined for 1.4 with digital displays */ 1679 if (edid->revision < 4) 1680 return; 1681 1682 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1683 return; 1684 1685 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1686 case DRM_EDID_DIGITAL_DEPTH_6: 1687 info->bpc = 6; 1688 break; 1689 case DRM_EDID_DIGITAL_DEPTH_8: 1690 info->bpc = 8; 1691 break; 1692 case DRM_EDID_DIGITAL_DEPTH_10: 1693 info->bpc = 10; 1694 break; 1695 case DRM_EDID_DIGITAL_DEPTH_12: 1696 info->bpc = 12; 1697 break; 1698 case DRM_EDID_DIGITAL_DEPTH_14: 1699 info->bpc = 14; 1700 break; 1701 case DRM_EDID_DIGITAL_DEPTH_16: 1702 info->bpc = 16; 1703 break; 1704 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1705 default: 1706 info->bpc = 0; 1707 break; 1708 } 1709 1710 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1711 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1712 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1713 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1714 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1715 1716 /* Get data from CEA blocks if present */ 1717 edid_ext = drm_find_cea_extension(edid); 1718 if (!edid_ext) 1719 return; 1720 1721 info->cea_rev = edid_ext[1]; 1722 } 1723 1724 /** 1725 * drm_add_edid_modes - add modes from EDID data, if available 1726 * @connector: connector we're probing 1727 * @edid: edid data 1728 * 1729 * Add the specified modes to the connector's mode list. 1730 * 1731 * Return number of modes added or 0 if we couldn't find any. 1732 */ 1733 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1734 { 1735 int num_modes = 0; 1736 u32 quirks; 1737 1738 if (edid == NULL) { 1739 return 0; 1740 } 1741 if (!drm_edid_is_valid(edid)) { 1742 device_printf(connector->dev->dev, "%s: EDID invalid.\n", 1743 drm_get_connector_name(connector)); 1744 return 0; 1745 } 1746 1747 quirks = edid_get_quirks(edid); 1748 1749 /* 1750 * EDID spec says modes should be preferred in this order: 1751 * - preferred detailed mode 1752 * - other detailed modes from base block 1753 * - detailed modes from extension blocks 1754 * - CVT 3-byte code modes 1755 * - standard timing codes 1756 * - established timing codes 1757 * - modes inferred from GTF or CVT range information 1758 * 1759 * We get this pretty much right. 1760 * 1761 * XXX order for additional mode types in extension blocks? 1762 */ 1763 num_modes += add_detailed_modes(connector, edid, quirks); 1764 num_modes += add_cvt_modes(connector, edid); 1765 num_modes += add_standard_modes(connector, edid); 1766 num_modes += add_established_modes(connector, edid); 1767 num_modes += add_inferred_modes(connector, edid); 1768 1769 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1770 edid_fixup_preferred(connector, quirks); 1771 1772 drm_add_display_info(edid, &connector->display_info); 1773 1774 return num_modes; 1775 } 1776 1777 /** 1778 * drm_add_modes_noedid - add modes for the connectors without EDID 1779 * @connector: connector we're probing 1780 * @hdisplay: the horizontal display limit 1781 * @vdisplay: the vertical display limit 1782 * 1783 * Add the specified modes to the connector's mode list. Only when the 1784 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1785 * 1786 * Return number of modes added or 0 if we couldn't find any. 1787 */ 1788 int drm_add_modes_noedid(struct drm_connector *connector, 1789 int hdisplay, int vdisplay) 1790 { 1791 int i, count, num_modes = 0; 1792 struct drm_display_mode *mode; 1793 struct drm_device *dev = connector->dev; 1794 1795 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1796 if (hdisplay < 0) 1797 hdisplay = 0; 1798 if (vdisplay < 0) 1799 vdisplay = 0; 1800 1801 for (i = 0; i < count; i++) { 1802 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1803 if (hdisplay && vdisplay) { 1804 /* 1805 * Only when two are valid, they will be used to check 1806 * whether the mode should be added to the mode list of 1807 * the connector. 1808 */ 1809 if (ptr->hdisplay > hdisplay || 1810 ptr->vdisplay > vdisplay) 1811 continue; 1812 } 1813 if (drm_mode_vrefresh(ptr) > 61) 1814 continue; 1815 mode = drm_mode_duplicate(dev, ptr); 1816 if (mode) { 1817 drm_mode_probed_add(connector, mode); 1818 num_modes++; 1819 } 1820 } 1821 return num_modes; 1822 } 1823