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 31 #include <sys/cdefs.h> 32 #include <dev/drm2/drmP.h> 33 #include <dev/drm2/drm_edid.h> 34 #include "drm_edid_modes.h" 35 #include <dev/iicbus/iic.h> 36 #include <dev/iicbus/iiconf.h> 37 #include "iicbus_if.h" 38 39 #define version_greater(edid, maj, min) \ 40 (((edid)->version > (maj)) || \ 41 ((edid)->version == (maj) && (edid)->revision > (min))) 42 43 #define EDID_EST_TIMINGS 16 44 #define EDID_STD_TIMINGS 8 45 #define EDID_DETAILED_TIMINGS 4 46 47 /* 48 * EDID blocks out in the wild have a variety of bugs, try to collect 49 * them here (note that userspace may work around broken monitors first, 50 * but fixes should make their way here so that the kernel "just works" 51 * on as many displays as possible). 52 */ 53 54 /* First detailed mode wrong, use largest 60Hz mode */ 55 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 56 /* Reported 135MHz pixel clock is too high, needs adjustment */ 57 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 58 /* Prefer the largest mode at 75 Hz */ 59 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 60 /* Detail timing is in cm not mm */ 61 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 62 /* Detailed timing descriptors have bogus size values, so just take the 63 * maximum size and use that. 64 */ 65 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 66 /* Monitor forgot to set the first detailed is preferred bit. */ 67 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 68 /* use +hsync +vsync for detailed mode */ 69 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 70 /* Force reduced-blanking timings for detailed modes */ 71 #define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7) 72 73 struct detailed_mode_closure { 74 struct drm_connector *connector; 75 struct edid *edid; 76 bool preferred; 77 u32 quirks; 78 int modes; 79 }; 80 81 #define LEVEL_DMT 0 82 #define LEVEL_GTF 1 83 #define LEVEL_GTF2 2 84 #define LEVEL_CVT 3 85 86 static struct edid_quirk { 87 char vendor[4]; 88 int product_id; 89 u32 quirks; 90 } edid_quirk_list[] = { 91 /* Acer AL1706 */ 92 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 93 /* Acer F51 */ 94 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 95 /* Unknown Acer */ 96 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 97 98 /* Belinea 10 15 55 */ 99 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 100 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 101 102 /* Envision Peripherals, Inc. EN-7100e */ 103 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 104 /* Envision EN2028 */ 105 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 106 107 /* Funai Electronics PM36B */ 108 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 109 EDID_QUIRK_DETAILED_IN_CM }, 110 111 /* LG Philips LCD LP154W01-A5 */ 112 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 113 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 114 115 /* Philips 107p5 CRT */ 116 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 117 118 /* Proview AY765C */ 119 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 120 121 /* Samsung SyncMaster 205BW. Note: irony */ 122 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 123 /* Samsung SyncMaster 22[5-6]BW */ 124 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 125 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 126 127 /* ViewSonic VA2026w */ 128 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING }, 129 }; 130 131 /*** DDC fetch and block validation ***/ 132 133 static const u8 edid_header[] = { 134 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 135 }; 136 137 /* 138 * Sanity check the header of the base EDID block. Return 8 if the header 139 * is perfect, down to 0 if it's totally wrong. 140 */ 141 int drm_edid_header_is_valid(const u8 *raw_edid) 142 { 143 int i, score = 0; 144 145 for (i = 0; i < sizeof(edid_header); i++) 146 if (raw_edid[i] == edid_header[i]) 147 score++; 148 149 return score; 150 } 151 EXPORT_SYMBOL(drm_edid_header_is_valid); 152 153 static int edid_fixup __read_mostly = 6; 154 module_param_named(edid_fixup, edid_fixup, int, 0400); 155 MODULE_PARM_DESC(edid_fixup, 156 "Minimum number of valid EDID header bytes (0-8, default 6)"); 157 158 /* 159 * Sanity check the EDID block (base or extension). Return 0 if the block 160 * doesn't check out, or 1 if it's valid. 161 */ 162 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid) 163 { 164 int i; 165 u8 csum = 0; 166 struct edid *edid = (struct edid *)raw_edid; 167 168 if (edid_fixup > 8 || edid_fixup < 0) 169 edid_fixup = 6; 170 171 if (block == 0) { 172 int score = drm_edid_header_is_valid(raw_edid); 173 if (score == 8) ; 174 else if (score >= edid_fixup) { 175 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 176 memcpy(raw_edid, edid_header, sizeof(edid_header)); 177 } else { 178 goto bad; 179 } 180 } 181 182 for (i = 0; i < EDID_LENGTH; i++) 183 csum += raw_edid[i]; 184 if (csum) { 185 if (print_bad_edid) { 186 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 187 } 188 189 /* allow CEA to slide through, switches mangle this */ 190 if (raw_edid[0] != 0x02) 191 goto bad; 192 } 193 194 /* per-block-type checks */ 195 switch (raw_edid[0]) { 196 case 0: /* base */ 197 if (edid->version != 1) { 198 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 199 goto bad; 200 } 201 202 if (edid->revision > 4) 203 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 204 break; 205 206 default: 207 break; 208 } 209 210 return 1; 211 212 bad: 213 if (raw_edid && print_bad_edid) { 214 DRM_DEBUG_KMS("Raw EDID:\n"); 215 for (i = 0; i < EDID_LENGTH; ) { 216 printf("%02x", raw_edid[i]); 217 i++; 218 if (i % 16 == 0 || i == EDID_LENGTH) 219 printf("\n"); 220 else if (i % 8 == 0) 221 printf(" "); 222 else 223 printf(" "); 224 } 225 } 226 return 0; 227 } 228 EXPORT_SYMBOL(drm_edid_block_valid); 229 230 /** 231 * drm_edid_is_valid - sanity check EDID data 232 * @edid: EDID data 233 * 234 * Sanity-check an entire EDID record (including extensions) 235 */ 236 bool drm_edid_is_valid(struct edid *edid) 237 { 238 int i; 239 u8 *raw = (u8 *)edid; 240 241 if (!edid) 242 return false; 243 244 for (i = 0; i <= edid->extensions; i++) 245 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true)) 246 return false; 247 248 return true; 249 } 250 EXPORT_SYMBOL(drm_edid_is_valid); 251 252 #define DDC_SEGMENT_ADDR 0x30 253 /** 254 * Get EDID information via I2C. 255 * 256 * \param adapter : i2c device adaptor 257 * \param buf : EDID data buffer to be filled 258 * \param len : EDID data buffer length 259 * \return 0 on success or -1 on failure. 260 * 261 * Try to fetch EDID information by calling i2c driver function. 262 */ 263 static int 264 drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf, 265 int block, int len) 266 { 267 unsigned char start = block * EDID_LENGTH; 268 unsigned char segment = block >> 1; 269 unsigned char xfers = segment ? 3 : 2; 270 int ret, retries = 5; 271 272 /* The core i2c driver will automatically retry the transfer if the 273 * adapter reports EAGAIN. However, we find that bit-banging transfers 274 * are susceptible to errors under a heavily loaded machine and 275 * generate spurious NAKs and timeouts. Retrying the transfer 276 * of the individual block a few times seems to overcome this. 277 */ 278 do { 279 struct iic_msg msgs[] = { 280 { 281 .slave = DDC_SEGMENT_ADDR << 1, 282 .flags = 0, 283 .len = 1, 284 .buf = &segment, 285 }, { 286 .slave = DDC_ADDR << 1, 287 .flags = 0, 288 .len = 1, 289 .buf = &start, 290 }, { 291 .slave = DDC_ADDR << 1, 292 .flags = IIC_M_RD, 293 .len = len, 294 .buf = buf, 295 } 296 }; 297 298 /* 299 * Avoid sending the segment addr to not upset non-compliant ddc 300 * monitors. 301 */ 302 ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers); 303 304 if (ret != 0) 305 DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n", 306 retries, ret); 307 } while (ret != 0 && --retries); 308 309 return ret == 0 ? 0 : -1; 310 } 311 312 static bool drm_edid_is_zero(u8 *in_edid, int length) 313 { 314 int i; 315 u32 *raw_edid = (u32 *)in_edid; 316 317 for (i = 0; i < length / 4; i++) 318 if (*(raw_edid + i) != 0) 319 return false; 320 321 return true; 322 } 323 324 static u8 * 325 drm_do_get_edid(struct drm_connector *connector, device_t adapter) 326 { 327 int i, j = 0, valid_extensions = 0; 328 u8 *block, *new; 329 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_DEBUGBITS_KMS); 330 331 if ((block = malloc(EDID_LENGTH, DRM_MEM_KMS, M_NOWAIT)) == NULL) 332 return NULL; 333 334 /* base block fetch */ 335 for (i = 0; i < 4; i++) { 336 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 337 goto out; 338 if (drm_edid_block_valid(block, 0, print_bad_edid)) 339 break; 340 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 341 connector->null_edid_counter++; 342 goto carp; 343 } 344 } 345 if (i == 4) 346 goto carp; 347 348 /* if there's no extensions, we're done */ 349 if (block[0x7e] == 0) 350 return block; 351 352 new = reallocf(block, (block[0x7e] + 1) * EDID_LENGTH, DRM_MEM_KMS, 353 M_NOWAIT); 354 if (!new) { 355 block = NULL; 356 goto out; 357 } 358 block = new; 359 360 for (j = 1; j <= block[0x7e]; j++) { 361 for (i = 0; i < 4; i++) { 362 if (drm_do_probe_ddc_edid(adapter, 363 block + (valid_extensions + 1) * EDID_LENGTH, 364 j, EDID_LENGTH)) 365 goto out; 366 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) { 367 valid_extensions++; 368 break; 369 } 370 } 371 372 if (i == 4 && print_bad_edid) { 373 dev_warn(connector->dev->dev, 374 "%s: Ignoring invalid EDID block %d.\n", 375 drm_get_connector_name(connector), j); 376 377 connector->bad_edid_counter++; 378 } 379 } 380 381 if (valid_extensions != block[0x7e]) { 382 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 383 block[0x7e] = valid_extensions; 384 new = reallocf(block, (valid_extensions + 1) * EDID_LENGTH, 385 DRM_MEM_KMS, M_NOWAIT); 386 if (!new) 387 goto out; 388 block = new; 389 } 390 391 return block; 392 393 carp: 394 if (print_bad_edid) { 395 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 396 drm_get_connector_name(connector), j); 397 } 398 connector->bad_edid_counter++; 399 400 out: 401 free(block, DRM_MEM_KMS); 402 return NULL; 403 } 404 405 /** 406 * Probe DDC presence. 407 * 408 * \param adapter : i2c device adaptor 409 * \return 1 on success 410 */ 411 bool 412 drm_probe_ddc(device_t adapter) 413 { 414 unsigned char out; 415 416 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 417 } 418 EXPORT_SYMBOL(drm_probe_ddc); 419 420 /** 421 * drm_get_edid - get EDID data, if available 422 * @connector: connector we're probing 423 * @adapter: i2c adapter to use for DDC 424 * 425 * Poke the given i2c channel to grab EDID data if possible. If found, 426 * attach it to the connector. 427 * 428 * Return edid data or NULL if we couldn't find any. 429 */ 430 struct edid *drm_get_edid(struct drm_connector *connector, 431 device_t adapter) 432 { 433 struct edid *edid = NULL; 434 435 if (drm_probe_ddc(adapter)) 436 edid = (struct edid *)drm_do_get_edid(connector, adapter); 437 438 return edid; 439 } 440 EXPORT_SYMBOL(drm_get_edid); 441 442 /*** EDID parsing ***/ 443 444 /** 445 * edid_vendor - match a string against EDID's obfuscated vendor field 446 * @edid: EDID to match 447 * @vendor: vendor string 448 * 449 * Returns true if @vendor is in @edid, false otherwise 450 */ 451 static bool edid_vendor(struct edid *edid, char *vendor) 452 { 453 char edid_vendor[3]; 454 455 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 456 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 457 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 458 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 459 460 return !strncmp(edid_vendor, vendor, 3); 461 } 462 463 /** 464 * edid_get_quirks - return quirk flags for a given EDID 465 * @edid: EDID to process 466 * 467 * This tells subsequent routines what fixes they need to apply. 468 */ 469 static u32 edid_get_quirks(struct edid *edid) 470 { 471 struct edid_quirk *quirk; 472 int i; 473 474 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 475 quirk = &edid_quirk_list[i]; 476 477 if (edid_vendor(edid, quirk->vendor) && 478 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 479 return quirk->quirks; 480 } 481 482 return 0; 483 } 484 485 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 486 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 487 488 /** 489 * edid_fixup_preferred - set preferred modes based on quirk list 490 * @connector: has mode list to fix up 491 * @quirks: quirks list 492 * 493 * Walk the mode list for @connector, clearing the preferred status 494 * on existing modes and setting it anew for the right mode ala @quirks. 495 */ 496 static void edid_fixup_preferred(struct drm_connector *connector, 497 u32 quirks) 498 { 499 struct drm_display_mode *t, *cur_mode, *preferred_mode; 500 int target_refresh = 0; 501 502 if (list_empty(&connector->probed_modes)) 503 return; 504 505 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 506 target_refresh = 60; 507 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 508 target_refresh = 75; 509 510 preferred_mode = list_first_entry(&connector->probed_modes, 511 struct drm_display_mode, head); 512 513 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 514 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 515 516 if (cur_mode == preferred_mode) 517 continue; 518 519 /* Largest mode is preferred */ 520 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 521 preferred_mode = cur_mode; 522 523 /* At a given size, try to get closest to target refresh */ 524 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 525 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 526 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 527 preferred_mode = cur_mode; 528 } 529 } 530 531 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 532 } 533 534 static bool 535 mode_is_rb(const struct drm_display_mode *mode) 536 { 537 return (mode->htotal - mode->hdisplay == 160) && 538 (mode->hsync_end - mode->hdisplay == 80) && 539 (mode->hsync_end - mode->hsync_start == 32) && 540 (mode->vsync_start - mode->vdisplay == 3); 541 } 542 543 /* 544 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 545 * @dev: Device to duplicate against 546 * @hsize: Mode width 547 * @vsize: Mode height 548 * @fresh: Mode refresh rate 549 * @rb: Mode reduced-blanking-ness 550 * 551 * Walk the DMT mode list looking for a match for the given parameters. 552 * Return a newly allocated copy of the mode, or NULL if not found. 553 */ 554 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 555 int hsize, int vsize, int fresh, 556 bool rb) 557 { 558 int i; 559 560 for (i = 0; i < drm_num_dmt_modes; i++) { 561 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 562 if (hsize != ptr->hdisplay) 563 continue; 564 if (vsize != ptr->vdisplay) 565 continue; 566 if (fresh != drm_mode_vrefresh(ptr)) 567 continue; 568 if (rb != mode_is_rb(ptr)) 569 continue; 570 571 return drm_mode_duplicate(dev, ptr); 572 } 573 574 return NULL; 575 } 576 EXPORT_SYMBOL(drm_mode_find_dmt); 577 578 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 579 580 static void 581 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 582 { 583 int i, n = 0; 584 u8 d = ext[0x02]; 585 u8 *det_base = ext + d; 586 587 n = (127 - d) / 18; 588 for (i = 0; i < n; i++) 589 cb((struct detailed_timing *)(det_base + 18 * i), closure); 590 } 591 592 static void 593 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 594 { 595 unsigned int i, n = min((int)ext[0x02], 6); 596 u8 *det_base = ext + 5; 597 598 if (ext[0x01] != 1) 599 return; /* unknown version */ 600 601 for (i = 0; i < n; i++) 602 cb((struct detailed_timing *)(det_base + 18 * i), closure); 603 } 604 605 static void 606 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 607 { 608 int i; 609 struct edid *edid = (struct edid *)raw_edid; 610 611 if (edid == NULL) 612 return; 613 614 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 615 cb(&(edid->detailed_timings[i]), closure); 616 617 for (i = 1; i <= raw_edid[0x7e]; i++) { 618 u8 *ext = raw_edid + (i * EDID_LENGTH); 619 switch (*ext) { 620 case CEA_EXT: 621 cea_for_each_detailed_block(ext, cb, closure); 622 break; 623 case VTB_EXT: 624 vtb_for_each_detailed_block(ext, cb, closure); 625 break; 626 default: 627 break; 628 } 629 } 630 } 631 632 static void 633 is_rb(struct detailed_timing *t, void *data) 634 { 635 u8 *r = (u8 *)t; 636 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 637 if (r[15] & 0x10) 638 *(bool *)data = true; 639 } 640 641 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 642 static bool 643 drm_monitor_supports_rb(struct edid *edid) 644 { 645 if (edid->revision >= 4) { 646 bool ret = false; 647 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 648 return ret; 649 } 650 651 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 652 } 653 654 static void 655 find_gtf2(struct detailed_timing *t, void *data) 656 { 657 u8 *r = (u8 *)t; 658 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 659 *(u8 **)data = r; 660 } 661 662 /* Secondary GTF curve kicks in above some break frequency */ 663 static int 664 drm_gtf2_hbreak(struct edid *edid) 665 { 666 u8 *r = NULL; 667 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 668 return r ? (r[12] * 2) : 0; 669 } 670 671 static int 672 drm_gtf2_2c(struct edid *edid) 673 { 674 u8 *r = NULL; 675 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 676 return r ? r[13] : 0; 677 } 678 679 static int 680 drm_gtf2_m(struct edid *edid) 681 { 682 u8 *r = NULL; 683 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 684 return r ? (r[15] << 8) + r[14] : 0; 685 } 686 687 static int 688 drm_gtf2_k(struct edid *edid) 689 { 690 u8 *r = NULL; 691 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 692 return r ? r[16] : 0; 693 } 694 695 static int 696 drm_gtf2_2j(struct edid *edid) 697 { 698 u8 *r = NULL; 699 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 700 return r ? r[17] : 0; 701 } 702 703 /** 704 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 705 * @edid: EDID block to scan 706 */ 707 static int standard_timing_level(struct edid *edid) 708 { 709 if (edid->revision >= 2) { 710 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 711 return LEVEL_CVT; 712 if (drm_gtf2_hbreak(edid)) 713 return LEVEL_GTF2; 714 return LEVEL_GTF; 715 } 716 return LEVEL_DMT; 717 } 718 719 /* 720 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 721 * monitors fill with ascii space (0x20) instead. 722 */ 723 static int 724 bad_std_timing(u8 a, u8 b) 725 { 726 return (a == 0x00 && b == 0x00) || 727 (a == 0x01 && b == 0x01) || 728 (a == 0x20 && b == 0x20); 729 } 730 731 /** 732 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 733 * @t: standard timing params 734 * @timing_level: standard timing level 735 * 736 * Take the standard timing params (in this case width, aspect, and refresh) 737 * and convert them into a real mode using CVT/GTF/DMT. 738 */ 739 static struct drm_display_mode * 740 drm_mode_std(struct drm_connector *connector, struct edid *edid, 741 struct std_timing *t, int revision) 742 { 743 struct drm_device *dev = connector->dev; 744 struct drm_display_mode *m, *mode = NULL; 745 int hsize, vsize; 746 int vrefresh_rate; 747 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 748 >> EDID_TIMING_ASPECT_SHIFT; 749 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 750 >> EDID_TIMING_VFREQ_SHIFT; 751 int timing_level = standard_timing_level(edid); 752 753 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 754 return NULL; 755 756 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 757 hsize = t->hsize * 8 + 248; 758 /* vrefresh_rate = vfreq + 60 */ 759 vrefresh_rate = vfreq + 60; 760 /* the vdisplay is calculated based on the aspect ratio */ 761 if (aspect_ratio == 0) { 762 if (revision < 3) 763 vsize = hsize; 764 else 765 vsize = (hsize * 10) / 16; 766 } else if (aspect_ratio == 1) 767 vsize = (hsize * 3) / 4; 768 else if (aspect_ratio == 2) 769 vsize = (hsize * 4) / 5; 770 else 771 vsize = (hsize * 9) / 16; 772 773 /* HDTV hack, part 1 */ 774 if (vrefresh_rate == 60 && 775 ((hsize == 1360 && vsize == 765) || 776 (hsize == 1368 && vsize == 769))) { 777 hsize = 1366; 778 vsize = 768; 779 } 780 781 /* 782 * If this connector already has a mode for this size and refresh 783 * rate (because it came from detailed or CVT info), use that 784 * instead. This way we don't have to guess at interlace or 785 * reduced blanking. 786 */ 787 list_for_each_entry(m, &connector->probed_modes, head) 788 if (m->hdisplay == hsize && m->vdisplay == vsize && 789 drm_mode_vrefresh(m) == vrefresh_rate) 790 return NULL; 791 792 /* HDTV hack, part 2 */ 793 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 794 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 795 false); 796 mode->hdisplay = 1366; 797 mode->hsync_start = mode->hsync_start - 1; 798 mode->hsync_end = mode->hsync_end - 1; 799 return mode; 800 } 801 802 /* check whether it can be found in default mode table */ 803 if (drm_monitor_supports_rb(edid)) { 804 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, 805 true); 806 if (mode) 807 return mode; 808 } 809 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false); 810 if (mode) 811 return mode; 812 813 /* okay, generate it */ 814 switch (timing_level) { 815 case LEVEL_DMT: 816 break; 817 case LEVEL_GTF: 818 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 819 break; 820 case LEVEL_GTF2: 821 /* 822 * This is potentially wrong if there's ever a monitor with 823 * more than one ranges section, each claiming a different 824 * secondary GTF curve. Please don't do that. 825 */ 826 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 827 if (!mode) 828 return NULL; 829 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 830 drm_mode_destroy(dev, mode); 831 mode = drm_gtf_mode_complex(dev, hsize, vsize, 832 vrefresh_rate, 0, 0, 833 drm_gtf2_m(edid), 834 drm_gtf2_2c(edid), 835 drm_gtf2_k(edid), 836 drm_gtf2_2j(edid)); 837 } 838 break; 839 case LEVEL_CVT: 840 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 841 false); 842 break; 843 } 844 return mode; 845 } 846 847 /* 848 * EDID is delightfully ambiguous about how interlaced modes are to be 849 * encoded. Our internal representation is of frame height, but some 850 * HDTV detailed timings are encoded as field height. 851 * 852 * The format list here is from CEA, in frame size. Technically we 853 * should be checking refresh rate too. Whatever. 854 */ 855 static void 856 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 857 struct detailed_pixel_timing *pt) 858 { 859 int i; 860 static const struct { 861 int w, h; 862 } cea_interlaced[] = { 863 { 1920, 1080 }, 864 { 720, 480 }, 865 { 1440, 480 }, 866 { 2880, 480 }, 867 { 720, 576 }, 868 { 1440, 576 }, 869 { 2880, 576 }, 870 }; 871 872 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 873 return; 874 875 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 876 if ((mode->hdisplay == cea_interlaced[i].w) && 877 (mode->vdisplay == cea_interlaced[i].h / 2)) { 878 mode->vdisplay *= 2; 879 mode->vsync_start *= 2; 880 mode->vsync_end *= 2; 881 mode->vtotal *= 2; 882 mode->vtotal |= 1; 883 } 884 } 885 886 mode->flags |= DRM_MODE_FLAG_INTERLACE; 887 } 888 889 /** 890 * drm_mode_detailed - create a new mode from an EDID detailed timing section 891 * @dev: DRM device (needed to create new mode) 892 * @edid: EDID block 893 * @timing: EDID detailed timing info 894 * @quirks: quirks to apply 895 * 896 * An EDID detailed timing block contains enough info for us to create and 897 * return a new struct drm_display_mode. 898 */ 899 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 900 struct edid *edid, 901 struct detailed_timing *timing, 902 u32 quirks) 903 { 904 struct drm_display_mode *mode; 905 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 906 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 907 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 908 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 909 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 910 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 911 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 912 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) << 2 | pt->vsync_offset_pulse_width_lo >> 4; 913 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 914 915 /* ignore tiny modes */ 916 if (hactive < 64 || vactive < 64) 917 return NULL; 918 919 if (pt->misc & DRM_EDID_PT_STEREO) { 920 printf("stereo mode not supported\n"); 921 return NULL; 922 } 923 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 924 printf("composite sync not supported\n"); 925 } 926 927 /* it is incorrect if hsync/vsync width is zero */ 928 if (!hsync_pulse_width || !vsync_pulse_width) { 929 DRM_DEBUG_KMS("Incorrect Detailed timing. " 930 "Wrong Hsync/Vsync pulse width\n"); 931 return NULL; 932 } 933 934 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) { 935 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false); 936 if (!mode) 937 return NULL; 938 939 goto set_size; 940 } 941 942 mode = drm_mode_create(dev); 943 if (!mode) 944 return NULL; 945 946 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 947 timing->pixel_clock = cpu_to_le16(1088); 948 949 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 950 951 mode->hdisplay = hactive; 952 mode->hsync_start = mode->hdisplay + hsync_offset; 953 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 954 mode->htotal = mode->hdisplay + hblank; 955 956 mode->vdisplay = vactive; 957 mode->vsync_start = mode->vdisplay + vsync_offset; 958 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 959 mode->vtotal = mode->vdisplay + vblank; 960 961 /* Some EDIDs have bogus h/vtotal values */ 962 if (mode->hsync_end > mode->htotal) 963 mode->htotal = mode->hsync_end + 1; 964 if (mode->vsync_end > mode->vtotal) 965 mode->vtotal = mode->vsync_end + 1; 966 967 drm_mode_do_interlace_quirk(mode, pt); 968 969 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 970 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 971 } 972 973 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 974 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 975 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 976 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 977 978 set_size: 979 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 980 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 981 982 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 983 mode->width_mm *= 10; 984 mode->height_mm *= 10; 985 } 986 987 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 988 mode->width_mm = edid->width_cm * 10; 989 mode->height_mm = edid->height_cm * 10; 990 } 991 992 mode->type = DRM_MODE_TYPE_DRIVER; 993 mode->vrefresh = drm_mode_vrefresh(mode); 994 drm_mode_set_name(mode); 995 996 return mode; 997 } 998 999 static bool 1000 mode_in_hsync_range(const struct drm_display_mode *mode, 1001 struct edid *edid, u8 *t) 1002 { 1003 int hsync, hmin, hmax; 1004 1005 hmin = t[7]; 1006 if (edid->revision >= 4) 1007 hmin += ((t[4] & 0x04) ? 255 : 0); 1008 hmax = t[8]; 1009 if (edid->revision >= 4) 1010 hmax += ((t[4] & 0x08) ? 255 : 0); 1011 hsync = drm_mode_hsync(mode); 1012 1013 return (hsync <= hmax && hsync >= hmin); 1014 } 1015 1016 static bool 1017 mode_in_vsync_range(const struct drm_display_mode *mode, 1018 struct edid *edid, u8 *t) 1019 { 1020 int vsync, vmin, vmax; 1021 1022 vmin = t[5]; 1023 if (edid->revision >= 4) 1024 vmin += ((t[4] & 0x01) ? 255 : 0); 1025 vmax = t[6]; 1026 if (edid->revision >= 4) 1027 vmax += ((t[4] & 0x02) ? 255 : 0); 1028 vsync = drm_mode_vrefresh(mode); 1029 1030 return (vsync <= vmax && vsync >= vmin); 1031 } 1032 1033 static u32 1034 range_pixel_clock(struct edid *edid, u8 *t) 1035 { 1036 /* unspecified */ 1037 if (t[9] == 0 || t[9] == 255) 1038 return 0; 1039 1040 /* 1.4 with CVT support gives us real precision, yay */ 1041 if (edid->revision >= 4 && t[10] == 0x04) 1042 return (t[9] * 10000) - ((t[12] >> 2) * 250); 1043 1044 /* 1.3 is pathetic, so fuzz up a bit */ 1045 return t[9] * 10000 + 5001; 1046 } 1047 1048 static bool 1049 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 1050 struct detailed_timing *timing) 1051 { 1052 u32 max_clock; 1053 u8 *t = (u8 *)timing; 1054 1055 if (!mode_in_hsync_range(mode, edid, t)) 1056 return false; 1057 1058 if (!mode_in_vsync_range(mode, edid, t)) 1059 return false; 1060 1061 if ((max_clock = range_pixel_clock(edid, t))) 1062 if (mode->clock > max_clock) 1063 return false; 1064 1065 /* 1.4 max horizontal check */ 1066 if (edid->revision >= 4 && t[10] == 0x04) 1067 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1068 return false; 1069 1070 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1071 return false; 1072 1073 return true; 1074 } 1075 1076 static bool valid_inferred_mode(const struct drm_connector *connector, 1077 const struct drm_display_mode *mode) 1078 { 1079 struct drm_display_mode *m; 1080 bool ok = false; 1081 1082 list_for_each_entry(m, &connector->probed_modes, head) { 1083 if (mode->hdisplay == m->hdisplay && 1084 mode->vdisplay == m->vdisplay && 1085 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m)) 1086 return false; /* duplicated */ 1087 if (mode->hdisplay <= m->hdisplay && 1088 mode->vdisplay <= m->vdisplay) 1089 ok = true; 1090 } 1091 return ok; 1092 } 1093 1094 static int 1095 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1096 struct detailed_timing *timing) 1097 { 1098 int i, modes = 0; 1099 struct drm_display_mode *newmode; 1100 struct drm_device *dev = connector->dev; 1101 1102 for (i = 0; i < drm_num_dmt_modes; i++) { 1103 if (mode_in_range(drm_dmt_modes + i, edid, timing) && 1104 valid_inferred_mode(connector, drm_dmt_modes + i)) { 1105 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1106 if (newmode) { 1107 drm_mode_probed_add(connector, newmode); 1108 modes++; 1109 } 1110 } 1111 } 1112 1113 return modes; 1114 } 1115 1116 /* fix up 1366x768 mode from 1368x768; 1117 * GFT/CVT can't express 1366 width which isn't dividable by 8 1118 */ 1119 static void fixup_mode_1366x768(struct drm_display_mode *mode) 1120 { 1121 if (mode->hdisplay == 1368 && mode->vdisplay == 768) { 1122 mode->hdisplay = 1366; 1123 mode->hsync_start--; 1124 mode->hsync_end--; 1125 drm_mode_set_name(mode); 1126 } 1127 } 1128 1129 static int 1130 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1131 struct detailed_timing *timing) 1132 { 1133 int i, modes = 0; 1134 struct drm_display_mode *newmode; 1135 struct drm_device *dev = connector->dev; 1136 1137 for (i = 0; i < num_extra_modes; i++) { 1138 const struct minimode *m = &extra_modes[i]; 1139 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0); 1140 if (!newmode) 1141 return modes; 1142 1143 fixup_mode_1366x768(newmode); 1144 if (!mode_in_range(newmode, edid, timing) || 1145 !valid_inferred_mode(connector, newmode)) { 1146 drm_mode_destroy(dev, newmode); 1147 continue; 1148 } 1149 1150 drm_mode_probed_add(connector, newmode); 1151 modes++; 1152 } 1153 1154 return modes; 1155 } 1156 1157 static int 1158 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1159 struct detailed_timing *timing) 1160 { 1161 int i, modes = 0; 1162 struct drm_display_mode *newmode; 1163 struct drm_device *dev = connector->dev; 1164 bool rb = drm_monitor_supports_rb(edid); 1165 1166 for (i = 0; i < num_extra_modes; i++) { 1167 const struct minimode *m = &extra_modes[i]; 1168 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0); 1169 if (!newmode) 1170 return modes; 1171 1172 fixup_mode_1366x768(newmode); 1173 if (!mode_in_range(newmode, edid, timing) || 1174 !valid_inferred_mode(connector, newmode)) { 1175 drm_mode_destroy(dev, newmode); 1176 continue; 1177 } 1178 1179 drm_mode_probed_add(connector, newmode); 1180 modes++; 1181 } 1182 1183 return modes; 1184 } 1185 1186 static void 1187 do_inferred_modes(struct detailed_timing *timing, void *c) 1188 { 1189 struct detailed_mode_closure *closure = c; 1190 struct detailed_non_pixel *data = &timing->data.other_data; 1191 struct detailed_data_monitor_range *range = &data->data.range; 1192 1193 if (data->type != EDID_DETAIL_MONITOR_RANGE) 1194 return; 1195 1196 closure->modes += drm_dmt_modes_for_range(closure->connector, 1197 closure->edid, 1198 timing); 1199 1200 if (!version_greater(closure->edid, 1, 1)) 1201 return; /* GTF not defined yet */ 1202 1203 switch (range->flags) { 1204 case 0x02: /* secondary gtf, XXX could do more */ 1205 case 0x00: /* default gtf */ 1206 closure->modes += drm_gtf_modes_for_range(closure->connector, 1207 closure->edid, 1208 timing); 1209 break; 1210 case 0x04: /* cvt, only in 1.4+ */ 1211 if (!version_greater(closure->edid, 1, 3)) 1212 break; 1213 1214 closure->modes += drm_cvt_modes_for_range(closure->connector, 1215 closure->edid, 1216 timing); 1217 break; 1218 case 0x01: /* just the ranges, no formula */ 1219 default: 1220 break; 1221 } 1222 } 1223 1224 static int 1225 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1226 { 1227 struct detailed_mode_closure closure = { 1228 connector, edid, 0, 0, 0 1229 }; 1230 1231 if (version_greater(edid, 1, 0)) 1232 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1233 &closure); 1234 1235 return closure.modes; 1236 } 1237 1238 static int 1239 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1240 { 1241 int i, j, m, modes = 0; 1242 struct drm_display_mode *mode; 1243 u8 *est = ((u8 *)timing) + 5; 1244 1245 for (i = 0; i < 6; i++) { 1246 for (j = 7; j > 0; j--) { 1247 m = (i * 8) + (7 - j); 1248 if (m >= ARRAY_SIZE(est3_modes)) 1249 break; 1250 if (est[i] & (1 << j)) { 1251 mode = drm_mode_find_dmt(connector->dev, 1252 est3_modes[m].w, 1253 est3_modes[m].h, 1254 est3_modes[m].r, 1255 est3_modes[m].rb); 1256 if (mode) { 1257 drm_mode_probed_add(connector, mode); 1258 modes++; 1259 } 1260 } 1261 } 1262 } 1263 1264 return modes; 1265 } 1266 1267 static void 1268 do_established_modes(struct detailed_timing *timing, void *c) 1269 { 1270 struct detailed_mode_closure *closure = c; 1271 struct detailed_non_pixel *data = &timing->data.other_data; 1272 1273 if (data->type == EDID_DETAIL_EST_TIMINGS) 1274 closure->modes += drm_est3_modes(closure->connector, timing); 1275 } 1276 1277 /** 1278 * add_established_modes - get est. modes from EDID and add them 1279 * @edid: EDID block to scan 1280 * 1281 * Each EDID block contains a bitmap of the supported "established modes" list 1282 * (defined above). Tease them out and add them to the global modes list. 1283 */ 1284 static int 1285 add_established_modes(struct drm_connector *connector, struct edid *edid) 1286 { 1287 struct drm_device *dev = connector->dev; 1288 unsigned long est_bits = edid->established_timings.t1 | 1289 (edid->established_timings.t2 << 8) | 1290 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1291 int i, modes = 0; 1292 struct detailed_mode_closure closure = { 1293 connector, edid, 0, 0, 0 1294 }; 1295 1296 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1297 if (est_bits & (1<<i)) { 1298 struct drm_display_mode *newmode; 1299 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1300 if (newmode) { 1301 drm_mode_probed_add(connector, newmode); 1302 modes++; 1303 } 1304 } 1305 } 1306 1307 if (version_greater(edid, 1, 0)) 1308 drm_for_each_detailed_block((u8 *)edid, 1309 do_established_modes, &closure); 1310 1311 return modes + closure.modes; 1312 } 1313 1314 static void 1315 do_standard_modes(struct detailed_timing *timing, void *c) 1316 { 1317 struct detailed_mode_closure *closure = c; 1318 struct detailed_non_pixel *data = &timing->data.other_data; 1319 struct drm_connector *connector = closure->connector; 1320 struct edid *edid = closure->edid; 1321 1322 if (data->type == EDID_DETAIL_STD_MODES) { 1323 int i; 1324 for (i = 0; i < 6; i++) { 1325 struct std_timing *std; 1326 struct drm_display_mode *newmode; 1327 1328 std = &data->data.timings[i]; 1329 newmode = drm_mode_std(connector, edid, std, 1330 edid->revision); 1331 if (newmode) { 1332 drm_mode_probed_add(connector, newmode); 1333 closure->modes++; 1334 } 1335 } 1336 } 1337 } 1338 1339 /** 1340 * add_standard_modes - get std. modes from EDID and add them 1341 * @edid: EDID block to scan 1342 * 1343 * Standard modes can be calculated using the appropriate standard (DMT, 1344 * GTF or CVT. Grab them from @edid and add them to the list. 1345 */ 1346 static int 1347 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1348 { 1349 int i, modes = 0; 1350 struct detailed_mode_closure closure = { 1351 connector, edid, 0, 0, 0 1352 }; 1353 1354 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1355 struct drm_display_mode *newmode; 1356 1357 newmode = drm_mode_std(connector, edid, 1358 &edid->standard_timings[i], 1359 edid->revision); 1360 if (newmode) { 1361 drm_mode_probed_add(connector, newmode); 1362 modes++; 1363 } 1364 } 1365 1366 if (version_greater(edid, 1, 0)) 1367 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1368 &closure); 1369 1370 /* XXX should also look for standard codes in VTB blocks */ 1371 1372 return modes + closure.modes; 1373 } 1374 1375 static int drm_cvt_modes(struct drm_connector *connector, 1376 struct detailed_timing *timing) 1377 { 1378 int i, j, modes = 0; 1379 struct drm_display_mode *newmode; 1380 struct drm_device *dev = connector->dev; 1381 struct cvt_timing *cvt; 1382 const int rates[] = { 60, 85, 75, 60, 50 }; 1383 const u8 empty[3] = { 0, 0, 0 }; 1384 1385 for (i = 0; i < 4; i++) { 1386 int width = 0, height; 1387 cvt = &(timing->data.other_data.data.cvt[i]); 1388 1389 if (!memcmp(cvt->code, empty, 3)) 1390 continue; 1391 1392 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1393 switch (cvt->code[1] & 0x0c) { 1394 case 0x00: 1395 width = height * 4 / 3; 1396 break; 1397 case 0x04: 1398 width = height * 16 / 9; 1399 break; 1400 case 0x08: 1401 width = height * 16 / 10; 1402 break; 1403 case 0x0c: 1404 width = height * 15 / 9; 1405 break; 1406 } 1407 1408 for (j = 1; j < 5; j++) { 1409 if (cvt->code[2] & (1 << j)) { 1410 newmode = drm_cvt_mode(dev, width, height, 1411 rates[j], j == 0, 1412 false, false); 1413 if (newmode) { 1414 drm_mode_probed_add(connector, newmode); 1415 modes++; 1416 } 1417 } 1418 } 1419 } 1420 1421 return modes; 1422 } 1423 1424 static void 1425 do_cvt_mode(struct detailed_timing *timing, void *c) 1426 { 1427 struct detailed_mode_closure *closure = c; 1428 struct detailed_non_pixel *data = &timing->data.other_data; 1429 1430 if (data->type == EDID_DETAIL_CVT_3BYTE) 1431 closure->modes += drm_cvt_modes(closure->connector, timing); 1432 } 1433 1434 static int 1435 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1436 { 1437 struct detailed_mode_closure closure = { 1438 connector, edid, 0, 0, 0 1439 }; 1440 1441 if (version_greater(edid, 1, 2)) 1442 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1443 1444 /* XXX should also look for CVT codes in VTB blocks */ 1445 1446 return closure.modes; 1447 } 1448 1449 static void 1450 do_detailed_mode(struct detailed_timing *timing, void *c) 1451 { 1452 struct detailed_mode_closure *closure = c; 1453 struct drm_display_mode *newmode; 1454 1455 if (timing->pixel_clock) { 1456 newmode = drm_mode_detailed(closure->connector->dev, 1457 closure->edid, timing, 1458 closure->quirks); 1459 if (!newmode) 1460 return; 1461 1462 if (closure->preferred) 1463 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1464 1465 drm_mode_probed_add(closure->connector, newmode); 1466 closure->modes++; 1467 closure->preferred = 0; 1468 } 1469 } 1470 1471 /* 1472 * add_detailed_modes - Add modes from detailed timings 1473 * @connector: attached connector 1474 * @edid: EDID block to scan 1475 * @quirks: quirks to apply 1476 */ 1477 static int 1478 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1479 u32 quirks) 1480 { 1481 struct detailed_mode_closure closure = { 1482 connector, 1483 edid, 1484 1, 1485 quirks, 1486 0 1487 }; 1488 1489 if (closure.preferred && !version_greater(edid, 1, 3)) 1490 closure.preferred = 1491 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1492 1493 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1494 1495 return closure.modes; 1496 } 1497 1498 #define HDMI_IDENTIFIER 0x000C03 1499 #define AUDIO_BLOCK 0x01 1500 #define VIDEO_BLOCK 0x02 1501 #define VENDOR_BLOCK 0x03 1502 #define SPEAKER_BLOCK 0x04 1503 #define EDID_BASIC_AUDIO (1 << 6) 1504 #define EDID_CEA_YCRCB444 (1 << 5) 1505 #define EDID_CEA_YCRCB422 (1 << 4) 1506 1507 /** 1508 * Search EDID for CEA extension block. 1509 */ 1510 u8 *drm_find_cea_extension(struct edid *edid) 1511 { 1512 u8 *edid_ext = NULL; 1513 int i; 1514 1515 /* No EDID or EDID extensions */ 1516 if (edid == NULL || edid->extensions == 0) 1517 return NULL; 1518 1519 /* Find CEA extension */ 1520 for (i = 0; i < edid->extensions; i++) { 1521 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1522 if (edid_ext[0] == CEA_EXT) 1523 break; 1524 } 1525 1526 if (i == edid->extensions) 1527 return NULL; 1528 1529 return edid_ext; 1530 } 1531 EXPORT_SYMBOL(drm_find_cea_extension); 1532 1533 /* 1534 * Looks for a CEA mode matching given drm_display_mode. 1535 * Returns its CEA Video ID code, or 0 if not found. 1536 */ 1537 u8 drm_match_cea_mode(struct drm_display_mode *to_match) 1538 { 1539 const struct drm_display_mode *cea_mode; 1540 u8 mode; 1541 1542 for (mode = 0; mode < drm_num_cea_modes; mode++) { 1543 cea_mode = (const struct drm_display_mode *)&edid_cea_modes[mode]; 1544 1545 if (drm_mode_equal(to_match, cea_mode)) 1546 return mode + 1; 1547 } 1548 return 0; 1549 } 1550 EXPORT_SYMBOL(drm_match_cea_mode); 1551 1552 1553 static int 1554 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1555 { 1556 struct drm_device *dev = connector->dev; 1557 u8 * mode, cea_mode; 1558 int modes = 0; 1559 1560 for (mode = db; mode < db + len; mode++) { 1561 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1562 if (cea_mode < drm_num_cea_modes) { 1563 struct drm_display_mode *newmode; 1564 newmode = drm_mode_duplicate(dev, 1565 &edid_cea_modes[cea_mode]); 1566 if (newmode) { 1567 drm_mode_probed_add(connector, newmode); 1568 modes++; 1569 } 1570 } 1571 } 1572 1573 return modes; 1574 } 1575 1576 static int 1577 cea_db_payload_len(const u8 *db) 1578 { 1579 return db[0] & 0x1f; 1580 } 1581 1582 static int 1583 cea_db_tag(const u8 *db) 1584 { 1585 return db[0] >> 5; 1586 } 1587 1588 static int 1589 cea_revision(const u8 *cea) 1590 { 1591 return cea[1]; 1592 } 1593 1594 static int 1595 cea_db_offsets(const u8 *cea, int *start, int *end) 1596 { 1597 /* Data block offset in CEA extension block */ 1598 *start = 4; 1599 *end = cea[2]; 1600 if (*end == 0) 1601 *end = 127; 1602 if (*end < 4 || *end > 127) 1603 return -ERANGE; 1604 return 0; 1605 } 1606 1607 #define for_each_cea_db(cea, i, start, end) \ 1608 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1) 1609 1610 static int 1611 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1612 { 1613 u8 * cea = drm_find_cea_extension(edid); 1614 u8 * db, dbl; 1615 int modes = 0; 1616 1617 if (cea && cea_revision(cea) >= 3) { 1618 int i, start, end; 1619 1620 if (cea_db_offsets(cea, &start, &end)) 1621 return 0; 1622 1623 for_each_cea_db(cea, i, start, end) { 1624 db = &cea[i]; 1625 dbl = cea_db_payload_len(db); 1626 1627 if (cea_db_tag(db) == VIDEO_BLOCK) 1628 modes += do_cea_modes (connector, db+1, dbl); 1629 } 1630 } 1631 1632 return modes; 1633 } 1634 1635 static void 1636 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db) 1637 { 1638 u8 len = cea_db_payload_len(db); 1639 1640 if (len >= 6) { 1641 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1642 connector->dvi_dual = db[6] & 1; 1643 } 1644 if (len >= 7) 1645 connector->max_tmds_clock = db[7] * 5; 1646 if (len >= 8) { 1647 connector->latency_present[0] = db[8] >> 7; 1648 connector->latency_present[1] = (db[8] >> 6) & 1; 1649 } 1650 if (len >= 9) 1651 connector->video_latency[0] = db[9]; 1652 if (len >= 10) 1653 connector->audio_latency[0] = db[10]; 1654 if (len >= 11) 1655 connector->video_latency[1] = db[11]; 1656 if (len >= 12) 1657 connector->audio_latency[1] = db[12]; 1658 1659 DRM_DEBUG_KMS("HDMI: DVI dual %d, " 1660 "max TMDS clock %d, " 1661 "latency present %d %d, " 1662 "video latency %d %d, " 1663 "audio latency %d %d\n", 1664 connector->dvi_dual, 1665 connector->max_tmds_clock, 1666 (int) connector->latency_present[0], 1667 (int) connector->latency_present[1], 1668 connector->video_latency[0], 1669 connector->video_latency[1], 1670 connector->audio_latency[0], 1671 connector->audio_latency[1]); 1672 } 1673 1674 static void 1675 monitor_name(struct detailed_timing *t, void *data) 1676 { 1677 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1678 *(u8 **)data = t->data.other_data.data.str.str; 1679 } 1680 1681 static bool cea_db_is_hdmi_vsdb(const u8 *db) 1682 { 1683 int hdmi_id; 1684 1685 if (cea_db_tag(db) != VENDOR_BLOCK) 1686 return false; 1687 1688 if (cea_db_payload_len(db) < 5) 1689 return false; 1690 1691 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16); 1692 1693 return hdmi_id == HDMI_IDENTIFIER; 1694 } 1695 1696 /** 1697 * drm_edid_to_eld - build ELD from EDID 1698 * @connector: connector corresponding to the HDMI/DP sink 1699 * @edid: EDID to parse 1700 * 1701 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1702 * Some ELD fields are left to the graphics driver caller: 1703 * - Conn_Type 1704 * - HDCP 1705 * - Port_ID 1706 */ 1707 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1708 { 1709 uint8_t *eld = connector->eld; 1710 u8 *cea; 1711 u8 *name; 1712 u8 *db; 1713 int sad_count = 0; 1714 int mnl; 1715 int dbl; 1716 1717 memset(eld, 0, sizeof(connector->eld)); 1718 1719 cea = drm_find_cea_extension(edid); 1720 if (!cea) { 1721 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1722 return; 1723 } 1724 1725 name = NULL; 1726 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1727 for (mnl = 0; name && mnl < 13; mnl++) { 1728 if (name[mnl] == 0x0a) 1729 break; 1730 eld[20 + mnl] = name[mnl]; 1731 } 1732 eld[4] = (cea[1] << 5) | mnl; 1733 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1734 1735 eld[0] = 2 << 3; /* ELD version: 2 */ 1736 1737 eld[16] = edid->mfg_id[0]; 1738 eld[17] = edid->mfg_id[1]; 1739 eld[18] = edid->prod_code[0]; 1740 eld[19] = edid->prod_code[1]; 1741 1742 if (cea_revision(cea) >= 3) { 1743 int i, start, end; 1744 1745 if (cea_db_offsets(cea, &start, &end)) { 1746 start = 0; 1747 end = 0; 1748 } 1749 1750 for_each_cea_db(cea, i, start, end) { 1751 db = &cea[i]; 1752 dbl = cea_db_payload_len(db); 1753 1754 switch (cea_db_tag(db)) { 1755 case AUDIO_BLOCK: 1756 /* Audio Data Block, contains SADs */ 1757 sad_count = dbl / 3; 1758 if (dbl >= 1) 1759 memcpy(eld + 20 + mnl, &db[1], dbl); 1760 break; 1761 case SPEAKER_BLOCK: 1762 /* Speaker Allocation Data Block */ 1763 if (dbl >= 1) 1764 eld[7] = db[1]; 1765 break; 1766 case VENDOR_BLOCK: 1767 /* HDMI Vendor-Specific Data Block */ 1768 if (cea_db_is_hdmi_vsdb(db)) 1769 parse_hdmi_vsdb(connector, db); 1770 break; 1771 default: 1772 break; 1773 } 1774 } 1775 } 1776 eld[5] |= sad_count << 4; 1777 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1778 1779 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1780 } 1781 EXPORT_SYMBOL(drm_edid_to_eld); 1782 1783 /** 1784 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1785 * @connector: connector associated with the HDMI/DP sink 1786 * @mode: the display mode 1787 */ 1788 int drm_av_sync_delay(struct drm_connector *connector, 1789 struct drm_display_mode *mode) 1790 { 1791 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1792 int a, v; 1793 1794 if (!connector->latency_present[0]) 1795 return 0; 1796 if (!connector->latency_present[1]) 1797 i = 0; 1798 1799 a = connector->audio_latency[i]; 1800 v = connector->video_latency[i]; 1801 1802 /* 1803 * HDMI/DP sink doesn't support audio or video? 1804 */ 1805 if (a == 255 || v == 255) 1806 return 0; 1807 1808 /* 1809 * Convert raw EDID values to millisecond. 1810 * Treat unknown latency as 0ms. 1811 */ 1812 if (a) 1813 a = min(2 * (a - 1), 500); 1814 if (v) 1815 v = min(2 * (v - 1), 500); 1816 1817 return max(v - a, 0); 1818 } 1819 EXPORT_SYMBOL(drm_av_sync_delay); 1820 1821 /** 1822 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1823 * @encoder: the encoder just changed display mode 1824 * @mode: the adjusted display mode 1825 * 1826 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1827 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1828 */ 1829 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1830 struct drm_display_mode *mode) 1831 { 1832 struct drm_connector *connector; 1833 struct drm_device *dev = encoder->dev; 1834 1835 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1836 if (connector->encoder == encoder && connector->eld[0]) 1837 return connector; 1838 1839 return NULL; 1840 } 1841 EXPORT_SYMBOL(drm_select_eld); 1842 1843 /** 1844 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1845 * @edid: monitor EDID information 1846 * 1847 * Parse the CEA extension according to CEA-861-B. 1848 * Return true if HDMI, false if not or unknown. 1849 */ 1850 bool drm_detect_hdmi_monitor(struct edid *edid) 1851 { 1852 u8 *edid_ext; 1853 int i; 1854 int start_offset, end_offset; 1855 1856 edid_ext = drm_find_cea_extension(edid); 1857 if (!edid_ext) 1858 return false; 1859 1860 if (cea_db_offsets(edid_ext, &start_offset, &end_offset)) 1861 return false; 1862 1863 /* 1864 * Because HDMI identifier is in Vendor Specific Block, 1865 * search it from all data blocks of CEA extension. 1866 */ 1867 for_each_cea_db(edid_ext, i, start_offset, end_offset) { 1868 if (cea_db_is_hdmi_vsdb(&edid_ext[i])) 1869 return true; 1870 } 1871 1872 return false; 1873 } 1874 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1875 1876 /** 1877 * drm_detect_monitor_audio - check monitor audio capability 1878 * 1879 * Monitor should have CEA extension block. 1880 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1881 * audio' only. If there is any audio extension block and supported 1882 * audio format, assume at least 'basic audio' support, even if 'basic 1883 * audio' is not defined in EDID. 1884 * 1885 */ 1886 bool drm_detect_monitor_audio(struct edid *edid) 1887 { 1888 u8 *edid_ext; 1889 int i, j; 1890 bool has_audio = false; 1891 int start_offset, end_offset; 1892 1893 edid_ext = drm_find_cea_extension(edid); 1894 if (!edid_ext) 1895 goto end; 1896 1897 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1898 1899 if (has_audio) { 1900 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1901 goto end; 1902 } 1903 1904 if (cea_db_offsets(edid_ext, &start_offset, &end_offset)) 1905 goto end; 1906 1907 for_each_cea_db(edid_ext, i, start_offset, end_offset) { 1908 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) { 1909 has_audio = true; 1910 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3) 1911 DRM_DEBUG_KMS("CEA audio format %d\n", 1912 (edid_ext[i + j] >> 3) & 0xf); 1913 goto end; 1914 } 1915 } 1916 end: 1917 return has_audio; 1918 } 1919 EXPORT_SYMBOL(drm_detect_monitor_audio); 1920 1921 /** 1922 * drm_add_display_info - pull display info out if present 1923 * @edid: EDID data 1924 * @info: display info (attached to connector) 1925 * 1926 * Grab any available display info and stuff it into the drm_display_info 1927 * structure that's part of the connector. Useful for tracking bpp and 1928 * color spaces. 1929 */ 1930 static void drm_add_display_info(struct edid *edid, 1931 struct drm_display_info *info) 1932 { 1933 u8 *edid_ext; 1934 1935 info->width_mm = edid->width_cm * 10; 1936 info->height_mm = edid->height_cm * 10; 1937 1938 /* driver figures it out in this case */ 1939 info->bpc = 0; 1940 info->color_formats = 0; 1941 1942 if (edid->revision < 3) 1943 return; 1944 1945 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1946 return; 1947 1948 /* Get data from CEA blocks if present */ 1949 edid_ext = drm_find_cea_extension(edid); 1950 if (edid_ext) { 1951 info->cea_rev = edid_ext[1]; 1952 1953 /* The existence of a CEA block should imply RGB support */ 1954 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1955 if (edid_ext[3] & EDID_CEA_YCRCB444) 1956 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1957 if (edid_ext[3] & EDID_CEA_YCRCB422) 1958 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1959 } 1960 1961 /* Only defined for 1.4 with digital displays */ 1962 if (edid->revision < 4) 1963 return; 1964 1965 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1966 case DRM_EDID_DIGITAL_DEPTH_6: 1967 info->bpc = 6; 1968 break; 1969 case DRM_EDID_DIGITAL_DEPTH_8: 1970 info->bpc = 8; 1971 break; 1972 case DRM_EDID_DIGITAL_DEPTH_10: 1973 info->bpc = 10; 1974 break; 1975 case DRM_EDID_DIGITAL_DEPTH_12: 1976 info->bpc = 12; 1977 break; 1978 case DRM_EDID_DIGITAL_DEPTH_14: 1979 info->bpc = 14; 1980 break; 1981 case DRM_EDID_DIGITAL_DEPTH_16: 1982 info->bpc = 16; 1983 break; 1984 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1985 default: 1986 info->bpc = 0; 1987 break; 1988 } 1989 1990 info->color_formats |= DRM_COLOR_FORMAT_RGB444; 1991 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444) 1992 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1993 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) 1994 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1995 } 1996 1997 /** 1998 * drm_add_edid_modes - add modes from EDID data, if available 1999 * @connector: connector we're probing 2000 * @edid: edid data 2001 * 2002 * Add the specified modes to the connector's mode list. 2003 * 2004 * Return number of modes added or 0 if we couldn't find any. 2005 */ 2006 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 2007 { 2008 int num_modes = 0; 2009 u32 quirks; 2010 2011 if (edid == NULL) { 2012 return 0; 2013 } 2014 if (!drm_edid_is_valid(edid)) { 2015 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 2016 drm_get_connector_name(connector)); 2017 return 0; 2018 } 2019 2020 quirks = edid_get_quirks(edid); 2021 2022 /* 2023 * EDID spec says modes should be preferred in this order: 2024 * - preferred detailed mode 2025 * - other detailed modes from base block 2026 * - detailed modes from extension blocks 2027 * - CVT 3-byte code modes 2028 * - standard timing codes 2029 * - established timing codes 2030 * - modes inferred from GTF or CVT range information 2031 * 2032 * We get this pretty much right. 2033 * 2034 * XXX order for additional mode types in extension blocks? 2035 */ 2036 num_modes += add_detailed_modes(connector, edid, quirks); 2037 num_modes += add_cvt_modes(connector, edid); 2038 num_modes += add_standard_modes(connector, edid); 2039 num_modes += add_established_modes(connector, edid); 2040 if (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF) 2041 num_modes += add_inferred_modes(connector, edid); 2042 num_modes += add_cea_modes(connector, edid); 2043 2044 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 2045 edid_fixup_preferred(connector, quirks); 2046 2047 drm_add_display_info(edid, &connector->display_info); 2048 2049 return num_modes; 2050 } 2051 EXPORT_SYMBOL(drm_add_edid_modes); 2052 2053 /** 2054 * drm_add_modes_noedid - add modes for the connectors without EDID 2055 * @connector: connector we're probing 2056 * @hdisplay: the horizontal display limit 2057 * @vdisplay: the vertical display limit 2058 * 2059 * Add the specified modes to the connector's mode list. Only when the 2060 * hdisplay/vdisplay is not beyond the given limit, it will be added. 2061 * 2062 * Return number of modes added or 0 if we couldn't find any. 2063 */ 2064 int drm_add_modes_noedid(struct drm_connector *connector, 2065 int hdisplay, int vdisplay) 2066 { 2067 int i, count, num_modes = 0; 2068 struct drm_display_mode *mode; 2069 struct drm_device *dev = connector->dev; 2070 2071 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 2072 if (hdisplay < 0) 2073 hdisplay = 0; 2074 if (vdisplay < 0) 2075 vdisplay = 0; 2076 2077 for (i = 0; i < count; i++) { 2078 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 2079 if (hdisplay && vdisplay) { 2080 /* 2081 * Only when two are valid, they will be used to check 2082 * whether the mode should be added to the mode list of 2083 * the connector. 2084 */ 2085 if (ptr->hdisplay > hdisplay || 2086 ptr->vdisplay > vdisplay) 2087 continue; 2088 } 2089 if (drm_mode_vrefresh(ptr) > 61) 2090 continue; 2091 mode = drm_mode_duplicate(dev, ptr); 2092 if (mode) { 2093 drm_mode_probed_add(connector, mode); 2094 num_modes++; 2095 } 2096 } 2097 return num_modes; 2098 } 2099 EXPORT_SYMBOL(drm_add_modes_noedid); 2100 2101 /** 2102 * drm_mode_cea_vic - return the CEA-861 VIC of a given mode 2103 * @mode: mode 2104 * 2105 * RETURNS: 2106 * The VIC number, 0 in case it's not a CEA-861 mode. 2107 */ 2108 uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode) 2109 { 2110 uint8_t i; 2111 2112 for (i = 0; i < drm_num_cea_modes; i++) 2113 if (drm_mode_equal(mode, &edid_cea_modes[i])) 2114 return i + 1; 2115 2116 return 0; 2117 } 2118 EXPORT_SYMBOL(drm_mode_cea_vic); 2119