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 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/i2c.h> 33 #include "drmP.h" 34 #include "drm_edid.h" 35 #include "drm_edid_modes.h" 36 37 #define version_greater(edid, maj, min) \ 38 (((edid)->version > (maj)) || \ 39 ((edid)->version == (maj) && (edid)->revision > (min))) 40 41 #define EDID_EST_TIMINGS 16 42 #define EDID_STD_TIMINGS 8 43 #define EDID_DETAILED_TIMINGS 4 44 45 /* 46 * EDID blocks out in the wild have a variety of bugs, try to collect 47 * them here (note that userspace may work around broken monitors first, 48 * but fixes should make their way here so that the kernel "just works" 49 * on as many displays as possible). 50 */ 51 52 /* First detailed mode wrong, use largest 60Hz mode */ 53 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 54 /* Reported 135MHz pixel clock is too high, needs adjustment */ 55 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 56 /* Prefer the largest mode at 75 Hz */ 57 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 58 /* Detail timing is in cm not mm */ 59 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 60 /* Detailed timing descriptors have bogus size values, so just take the 61 * maximum size and use that. 62 */ 63 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 64 /* Monitor forgot to set the first detailed is preferred bit. */ 65 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 66 /* use +hsync +vsync for detailed mode */ 67 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 68 69 struct detailed_mode_closure { 70 struct drm_connector *connector; 71 struct edid *edid; 72 bool preferred; 73 u32 quirks; 74 int modes; 75 }; 76 77 #define LEVEL_DMT 0 78 #define LEVEL_GTF 1 79 #define LEVEL_GTF2 2 80 #define LEVEL_CVT 3 81 82 static struct edid_quirk { 83 char *vendor; 84 int product_id; 85 u32 quirks; 86 } edid_quirk_list[] = { 87 /* Acer AL1706 */ 88 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 89 /* Acer F51 */ 90 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 91 /* Unknown Acer */ 92 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 93 94 /* Belinea 10 15 55 */ 95 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 96 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 97 98 /* Envision Peripherals, Inc. EN-7100e */ 99 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 100 /* Envision EN2028 */ 101 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 102 103 /* Funai Electronics PM36B */ 104 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 105 EDID_QUIRK_DETAILED_IN_CM }, 106 107 /* LG Philips LCD LP154W01-A5 */ 108 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 109 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 110 111 /* Philips 107p5 CRT */ 112 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 113 114 /* Proview AY765C */ 115 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 116 117 /* Samsung SyncMaster 205BW. Note: irony */ 118 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 119 /* Samsung SyncMaster 22[5-6]BW */ 120 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 121 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 122 }; 123 124 /*** DDC fetch and block validation ***/ 125 126 static const u8 edid_header[] = { 127 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 128 }; 129 130 /* 131 * Sanity check the header of the base EDID block. Return 8 if the header 132 * is perfect, down to 0 if it's totally wrong. 133 */ 134 int drm_edid_header_is_valid(const u8 *raw_edid) 135 { 136 int i, score = 0; 137 138 for (i = 0; i < sizeof(edid_header); i++) 139 if (raw_edid[i] == edid_header[i]) 140 score++; 141 142 return score; 143 } 144 EXPORT_SYMBOL(drm_edid_header_is_valid); 145 146 147 /* 148 * Sanity check the EDID block (base or extension). Return 0 if the block 149 * doesn't check out, or 1 if it's valid. 150 */ 151 static bool 152 drm_edid_block_valid(u8 *raw_edid) 153 { 154 int i; 155 u8 csum = 0; 156 struct edid *edid = (struct edid *)raw_edid; 157 158 if (raw_edid[0] == 0x00) { 159 int score = drm_edid_header_is_valid(raw_edid); 160 if (score == 8) ; 161 else if (score >= 6) { 162 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 163 memcpy(raw_edid, edid_header, sizeof(edid_header)); 164 } else { 165 goto bad; 166 } 167 } 168 169 for (i = 0; i < EDID_LENGTH; i++) 170 csum += raw_edid[i]; 171 if (csum) { 172 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 173 174 /* allow CEA to slide through, switches mangle this */ 175 if (raw_edid[0] != 0x02) 176 goto bad; 177 } 178 179 /* per-block-type checks */ 180 switch (raw_edid[0]) { 181 case 0: /* base */ 182 if (edid->version != 1) { 183 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 184 goto bad; 185 } 186 187 if (edid->revision > 4) 188 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 189 break; 190 191 default: 192 break; 193 } 194 195 return 1; 196 197 bad: 198 if (raw_edid) { 199 printk(KERN_ERR "Raw EDID:\n"); 200 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1, 201 raw_edid, EDID_LENGTH, false); 202 } 203 return 0; 204 } 205 206 /** 207 * drm_edid_is_valid - sanity check EDID data 208 * @edid: EDID data 209 * 210 * Sanity-check an entire EDID record (including extensions) 211 */ 212 bool drm_edid_is_valid(struct edid *edid) 213 { 214 int i; 215 u8 *raw = (u8 *)edid; 216 217 if (!edid) 218 return false; 219 220 for (i = 0; i <= edid->extensions; i++) 221 if (!drm_edid_block_valid(raw + i * EDID_LENGTH)) 222 return false; 223 224 return true; 225 } 226 EXPORT_SYMBOL(drm_edid_is_valid); 227 228 #define DDC_ADDR 0x50 229 #define DDC_SEGMENT_ADDR 0x30 230 /** 231 * Get EDID information via I2C. 232 * 233 * \param adapter : i2c device adaptor 234 * \param buf : EDID data buffer to be filled 235 * \param len : EDID data buffer length 236 * \return 0 on success or -1 on failure. 237 * 238 * Try to fetch EDID information by calling i2c driver function. 239 */ 240 static int 241 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, 242 int block, int len) 243 { 244 unsigned char start = block * EDID_LENGTH; 245 int ret, retries = 5; 246 247 /* The core i2c driver will automatically retry the transfer if the 248 * adapter reports EAGAIN. However, we find that bit-banging transfers 249 * are susceptible to errors under a heavily loaded machine and 250 * generate spurious NAKs and timeouts. Retrying the transfer 251 * of the individual block a few times seems to overcome this. 252 */ 253 do { 254 struct i2c_msg msgs[] = { 255 { 256 .addr = DDC_ADDR, 257 .flags = 0, 258 .len = 1, 259 .buf = &start, 260 }, { 261 .addr = DDC_ADDR, 262 .flags = I2C_M_RD, 263 .len = len, 264 .buf = buf, 265 } 266 }; 267 ret = i2c_transfer(adapter, msgs, 2); 268 } while (ret != 2 && --retries); 269 270 return ret == 2 ? 0 : -1; 271 } 272 273 static bool drm_edid_is_zero(u8 *in_edid, int length) 274 { 275 int i; 276 u32 *raw_edid = (u32 *)in_edid; 277 278 for (i = 0; i < length / 4; i++) 279 if (*(raw_edid + i) != 0) 280 return false; 281 return true; 282 } 283 284 static u8 * 285 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 286 { 287 int i, j = 0, valid_extensions = 0; 288 u8 *block, *new; 289 290 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 291 return NULL; 292 293 /* base block fetch */ 294 for (i = 0; i < 4; i++) { 295 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 296 goto out; 297 if (drm_edid_block_valid(block)) 298 break; 299 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 300 connector->null_edid_counter++; 301 goto carp; 302 } 303 } 304 if (i == 4) 305 goto carp; 306 307 /* if there's no extensions, we're done */ 308 if (block[0x7e] == 0) 309 return block; 310 311 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 312 if (!new) 313 goto out; 314 block = new; 315 316 for (j = 1; j <= block[0x7e]; j++) { 317 for (i = 0; i < 4; i++) { 318 if (drm_do_probe_ddc_edid(adapter, 319 block + (valid_extensions + 1) * EDID_LENGTH, 320 j, EDID_LENGTH)) 321 goto out; 322 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 323 valid_extensions++; 324 break; 325 } 326 } 327 if (i == 4) 328 dev_warn(connector->dev->dev, 329 "%s: Ignoring invalid EDID block %d.\n", 330 drm_get_connector_name(connector), j); 331 } 332 333 if (valid_extensions != block[0x7e]) { 334 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 335 block[0x7e] = valid_extensions; 336 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 337 if (!new) 338 goto out; 339 block = new; 340 } 341 342 return block; 343 344 carp: 345 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 346 drm_get_connector_name(connector), j); 347 348 out: 349 kfree(block); 350 return NULL; 351 } 352 353 /** 354 * Probe DDC presence. 355 * 356 * \param adapter : i2c device adaptor 357 * \return 1 on success 358 */ 359 static bool 360 drm_probe_ddc(struct i2c_adapter *adapter) 361 { 362 unsigned char out; 363 364 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 365 } 366 367 /** 368 * drm_get_edid - get EDID data, if available 369 * @connector: connector we're probing 370 * @adapter: i2c adapter to use for DDC 371 * 372 * Poke the given i2c channel to grab EDID data if possible. If found, 373 * attach it to the connector. 374 * 375 * Return edid data or NULL if we couldn't find any. 376 */ 377 struct edid *drm_get_edid(struct drm_connector *connector, 378 struct i2c_adapter *adapter) 379 { 380 struct edid *edid = NULL; 381 382 if (drm_probe_ddc(adapter)) 383 edid = (struct edid *)drm_do_get_edid(connector, adapter); 384 385 connector->display_info.raw_edid = (char *)edid; 386 387 return edid; 388 389 } 390 EXPORT_SYMBOL(drm_get_edid); 391 392 /*** EDID parsing ***/ 393 394 /** 395 * edid_vendor - match a string against EDID's obfuscated vendor field 396 * @edid: EDID to match 397 * @vendor: vendor string 398 * 399 * Returns true if @vendor is in @edid, false otherwise 400 */ 401 static bool edid_vendor(struct edid *edid, char *vendor) 402 { 403 char edid_vendor[3]; 404 405 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 406 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 407 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 408 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 409 410 return !strncmp(edid_vendor, vendor, 3); 411 } 412 413 /** 414 * edid_get_quirks - return quirk flags for a given EDID 415 * @edid: EDID to process 416 * 417 * This tells subsequent routines what fixes they need to apply. 418 */ 419 static u32 edid_get_quirks(struct edid *edid) 420 { 421 struct edid_quirk *quirk; 422 int i; 423 424 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 425 quirk = &edid_quirk_list[i]; 426 427 if (edid_vendor(edid, quirk->vendor) && 428 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 429 return quirk->quirks; 430 } 431 432 return 0; 433 } 434 435 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 436 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 437 438 /** 439 * edid_fixup_preferred - set preferred modes based on quirk list 440 * @connector: has mode list to fix up 441 * @quirks: quirks list 442 * 443 * Walk the mode list for @connector, clearing the preferred status 444 * on existing modes and setting it anew for the right mode ala @quirks. 445 */ 446 static void edid_fixup_preferred(struct drm_connector *connector, 447 u32 quirks) 448 { 449 struct drm_display_mode *t, *cur_mode, *preferred_mode; 450 int target_refresh = 0; 451 452 if (list_empty(&connector->probed_modes)) 453 return; 454 455 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 456 target_refresh = 60; 457 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 458 target_refresh = 75; 459 460 preferred_mode = list_first_entry(&connector->probed_modes, 461 struct drm_display_mode, head); 462 463 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 464 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 465 466 if (cur_mode == preferred_mode) 467 continue; 468 469 /* Largest mode is preferred */ 470 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 471 preferred_mode = cur_mode; 472 473 /* At a given size, try to get closest to target refresh */ 474 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 475 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 476 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 477 preferred_mode = cur_mode; 478 } 479 } 480 481 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 482 } 483 484 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 485 int hsize, int vsize, int fresh) 486 { 487 struct drm_display_mode *mode = NULL; 488 int i; 489 490 for (i = 0; i < drm_num_dmt_modes; i++) { 491 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 492 if (hsize == ptr->hdisplay && 493 vsize == ptr->vdisplay && 494 fresh == drm_mode_vrefresh(ptr)) { 495 /* get the expected default mode */ 496 mode = drm_mode_duplicate(dev, ptr); 497 break; 498 } 499 } 500 return mode; 501 } 502 EXPORT_SYMBOL(drm_mode_find_dmt); 503 504 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 505 506 static void 507 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 508 { 509 int i, n = 0; 510 u8 rev = ext[0x01], d = ext[0x02]; 511 u8 *det_base = ext + d; 512 513 switch (rev) { 514 case 0: 515 /* can't happen */ 516 return; 517 case 1: 518 /* have to infer how many blocks we have, check pixel clock */ 519 for (i = 0; i < 6; i++) 520 if (det_base[18*i] || det_base[18*i+1]) 521 n++; 522 break; 523 default: 524 /* explicit count */ 525 n = min(ext[0x03] & 0x0f, 6); 526 break; 527 } 528 529 for (i = 0; i < n; i++) 530 cb((struct detailed_timing *)(det_base + 18 * i), closure); 531 } 532 533 static void 534 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 535 { 536 unsigned int i, n = min((int)ext[0x02], 6); 537 u8 *det_base = ext + 5; 538 539 if (ext[0x01] != 1) 540 return; /* unknown version */ 541 542 for (i = 0; i < n; i++) 543 cb((struct detailed_timing *)(det_base + 18 * i), closure); 544 } 545 546 static void 547 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 548 { 549 int i; 550 struct edid *edid = (struct edid *)raw_edid; 551 552 if (edid == NULL) 553 return; 554 555 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 556 cb(&(edid->detailed_timings[i]), closure); 557 558 for (i = 1; i <= raw_edid[0x7e]; i++) { 559 u8 *ext = raw_edid + (i * EDID_LENGTH); 560 switch (*ext) { 561 case CEA_EXT: 562 cea_for_each_detailed_block(ext, cb, closure); 563 break; 564 case VTB_EXT: 565 vtb_for_each_detailed_block(ext, cb, closure); 566 break; 567 default: 568 break; 569 } 570 } 571 } 572 573 static void 574 is_rb(struct detailed_timing *t, void *data) 575 { 576 u8 *r = (u8 *)t; 577 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 578 if (r[15] & 0x10) 579 *(bool *)data = true; 580 } 581 582 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 583 static bool 584 drm_monitor_supports_rb(struct edid *edid) 585 { 586 if (edid->revision >= 4) { 587 bool ret; 588 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 589 return ret; 590 } 591 592 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 593 } 594 595 static void 596 find_gtf2(struct detailed_timing *t, void *data) 597 { 598 u8 *r = (u8 *)t; 599 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 600 *(u8 **)data = r; 601 } 602 603 /* Secondary GTF curve kicks in above some break frequency */ 604 static int 605 drm_gtf2_hbreak(struct edid *edid) 606 { 607 u8 *r = NULL; 608 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 609 return r ? (r[12] * 2) : 0; 610 } 611 612 static int 613 drm_gtf2_2c(struct edid *edid) 614 { 615 u8 *r = NULL; 616 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 617 return r ? r[13] : 0; 618 } 619 620 static int 621 drm_gtf2_m(struct edid *edid) 622 { 623 u8 *r = NULL; 624 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 625 return r ? (r[15] << 8) + r[14] : 0; 626 } 627 628 static int 629 drm_gtf2_k(struct edid *edid) 630 { 631 u8 *r = NULL; 632 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 633 return r ? r[16] : 0; 634 } 635 636 static int 637 drm_gtf2_2j(struct edid *edid) 638 { 639 u8 *r = NULL; 640 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 641 return r ? r[17] : 0; 642 } 643 644 /** 645 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 646 * @edid: EDID block to scan 647 */ 648 static int standard_timing_level(struct edid *edid) 649 { 650 if (edid->revision >= 2) { 651 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 652 return LEVEL_CVT; 653 if (drm_gtf2_hbreak(edid)) 654 return LEVEL_GTF2; 655 return LEVEL_GTF; 656 } 657 return LEVEL_DMT; 658 } 659 660 /* 661 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 662 * monitors fill with ascii space (0x20) instead. 663 */ 664 static int 665 bad_std_timing(u8 a, u8 b) 666 { 667 return (a == 0x00 && b == 0x00) || 668 (a == 0x01 && b == 0x01) || 669 (a == 0x20 && b == 0x20); 670 } 671 672 /** 673 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 674 * @t: standard timing params 675 * @timing_level: standard timing level 676 * 677 * Take the standard timing params (in this case width, aspect, and refresh) 678 * and convert them into a real mode using CVT/GTF/DMT. 679 */ 680 static struct drm_display_mode * 681 drm_mode_std(struct drm_connector *connector, struct edid *edid, 682 struct std_timing *t, int revision) 683 { 684 struct drm_device *dev = connector->dev; 685 struct drm_display_mode *m, *mode = NULL; 686 int hsize, vsize; 687 int vrefresh_rate; 688 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 689 >> EDID_TIMING_ASPECT_SHIFT; 690 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 691 >> EDID_TIMING_VFREQ_SHIFT; 692 int timing_level = standard_timing_level(edid); 693 694 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 695 return NULL; 696 697 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 698 hsize = t->hsize * 8 + 248; 699 /* vrefresh_rate = vfreq + 60 */ 700 vrefresh_rate = vfreq + 60; 701 /* the vdisplay is calculated based on the aspect ratio */ 702 if (aspect_ratio == 0) { 703 if (revision < 3) 704 vsize = hsize; 705 else 706 vsize = (hsize * 10) / 16; 707 } else if (aspect_ratio == 1) 708 vsize = (hsize * 3) / 4; 709 else if (aspect_ratio == 2) 710 vsize = (hsize * 4) / 5; 711 else 712 vsize = (hsize * 9) / 16; 713 714 /* HDTV hack, part 1 */ 715 if (vrefresh_rate == 60 && 716 ((hsize == 1360 && vsize == 765) || 717 (hsize == 1368 && vsize == 769))) { 718 hsize = 1366; 719 vsize = 768; 720 } 721 722 /* 723 * If this connector already has a mode for this size and refresh 724 * rate (because it came from detailed or CVT info), use that 725 * instead. This way we don't have to guess at interlace or 726 * reduced blanking. 727 */ 728 list_for_each_entry(m, &connector->probed_modes, head) 729 if (m->hdisplay == hsize && m->vdisplay == vsize && 730 drm_mode_vrefresh(m) == vrefresh_rate) 731 return NULL; 732 733 /* HDTV hack, part 2 */ 734 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 735 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 736 false); 737 mode->hdisplay = 1366; 738 mode->hsync_start = mode->hsync_start - 1; 739 mode->hsync_end = mode->hsync_end - 1; 740 return mode; 741 } 742 743 /* check whether it can be found in default mode table */ 744 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 745 if (mode) 746 return mode; 747 748 switch (timing_level) { 749 case LEVEL_DMT: 750 break; 751 case LEVEL_GTF: 752 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 753 break; 754 case LEVEL_GTF2: 755 /* 756 * This is potentially wrong if there's ever a monitor with 757 * more than one ranges section, each claiming a different 758 * secondary GTF curve. Please don't do that. 759 */ 760 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 761 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 762 kfree(mode); 763 mode = drm_gtf_mode_complex(dev, hsize, vsize, 764 vrefresh_rate, 0, 0, 765 drm_gtf2_m(edid), 766 drm_gtf2_2c(edid), 767 drm_gtf2_k(edid), 768 drm_gtf2_2j(edid)); 769 } 770 break; 771 case LEVEL_CVT: 772 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 773 false); 774 break; 775 } 776 return mode; 777 } 778 779 /* 780 * EDID is delightfully ambiguous about how interlaced modes are to be 781 * encoded. Our internal representation is of frame height, but some 782 * HDTV detailed timings are encoded as field height. 783 * 784 * The format list here is from CEA, in frame size. Technically we 785 * should be checking refresh rate too. Whatever. 786 */ 787 static void 788 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 789 struct detailed_pixel_timing *pt) 790 { 791 int i; 792 static const struct { 793 int w, h; 794 } cea_interlaced[] = { 795 { 1920, 1080 }, 796 { 720, 480 }, 797 { 1440, 480 }, 798 { 2880, 480 }, 799 { 720, 576 }, 800 { 1440, 576 }, 801 { 2880, 576 }, 802 }; 803 804 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 805 return; 806 807 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 808 if ((mode->hdisplay == cea_interlaced[i].w) && 809 (mode->vdisplay == cea_interlaced[i].h / 2)) { 810 mode->vdisplay *= 2; 811 mode->vsync_start *= 2; 812 mode->vsync_end *= 2; 813 mode->vtotal *= 2; 814 mode->vtotal |= 1; 815 } 816 } 817 818 mode->flags |= DRM_MODE_FLAG_INTERLACE; 819 } 820 821 /** 822 * drm_mode_detailed - create a new mode from an EDID detailed timing section 823 * @dev: DRM device (needed to create new mode) 824 * @edid: EDID block 825 * @timing: EDID detailed timing info 826 * @quirks: quirks to apply 827 * 828 * An EDID detailed timing block contains enough info for us to create and 829 * return a new struct drm_display_mode. 830 */ 831 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 832 struct edid *edid, 833 struct detailed_timing *timing, 834 u32 quirks) 835 { 836 struct drm_display_mode *mode; 837 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 838 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 839 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 840 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 841 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 842 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 843 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 844 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 845 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 846 847 /* ignore tiny modes */ 848 if (hactive < 64 || vactive < 64) 849 return NULL; 850 851 if (pt->misc & DRM_EDID_PT_STEREO) { 852 printk(KERN_WARNING "stereo mode not supported\n"); 853 return NULL; 854 } 855 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 856 printk(KERN_WARNING "composite sync not supported\n"); 857 } 858 859 /* it is incorrect if hsync/vsync width is zero */ 860 if (!hsync_pulse_width || !vsync_pulse_width) { 861 DRM_DEBUG_KMS("Incorrect Detailed timing. " 862 "Wrong Hsync/Vsync pulse width\n"); 863 return NULL; 864 } 865 mode = drm_mode_create(dev); 866 if (!mode) 867 return NULL; 868 869 mode->type = DRM_MODE_TYPE_DRIVER; 870 871 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 872 timing->pixel_clock = cpu_to_le16(1088); 873 874 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 875 876 mode->hdisplay = hactive; 877 mode->hsync_start = mode->hdisplay + hsync_offset; 878 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 879 mode->htotal = mode->hdisplay + hblank; 880 881 mode->vdisplay = vactive; 882 mode->vsync_start = mode->vdisplay + vsync_offset; 883 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 884 mode->vtotal = mode->vdisplay + vblank; 885 886 /* Some EDIDs have bogus h/vtotal values */ 887 if (mode->hsync_end > mode->htotal) 888 mode->htotal = mode->hsync_end + 1; 889 if (mode->vsync_end > mode->vtotal) 890 mode->vtotal = mode->vsync_end + 1; 891 892 drm_mode_do_interlace_quirk(mode, pt); 893 894 drm_mode_set_name(mode); 895 896 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 897 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 898 } 899 900 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 901 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 902 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 903 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 904 905 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 906 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 907 908 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 909 mode->width_mm *= 10; 910 mode->height_mm *= 10; 911 } 912 913 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 914 mode->width_mm = edid->width_cm * 10; 915 mode->height_mm = edid->height_cm * 10; 916 } 917 918 return mode; 919 } 920 921 static bool 922 mode_is_rb(const struct drm_display_mode *mode) 923 { 924 return (mode->htotal - mode->hdisplay == 160) && 925 (mode->hsync_end - mode->hdisplay == 80) && 926 (mode->hsync_end - mode->hsync_start == 32) && 927 (mode->vsync_start - mode->vdisplay == 3); 928 } 929 930 static bool 931 mode_in_hsync_range(const struct drm_display_mode *mode, 932 struct edid *edid, u8 *t) 933 { 934 int hsync, hmin, hmax; 935 936 hmin = t[7]; 937 if (edid->revision >= 4) 938 hmin += ((t[4] & 0x04) ? 255 : 0); 939 hmax = t[8]; 940 if (edid->revision >= 4) 941 hmax += ((t[4] & 0x08) ? 255 : 0); 942 hsync = drm_mode_hsync(mode); 943 944 return (hsync <= hmax && hsync >= hmin); 945 } 946 947 static bool 948 mode_in_vsync_range(const struct drm_display_mode *mode, 949 struct edid *edid, u8 *t) 950 { 951 int vsync, vmin, vmax; 952 953 vmin = t[5]; 954 if (edid->revision >= 4) 955 vmin += ((t[4] & 0x01) ? 255 : 0); 956 vmax = t[6]; 957 if (edid->revision >= 4) 958 vmax += ((t[4] & 0x02) ? 255 : 0); 959 vsync = drm_mode_vrefresh(mode); 960 961 return (vsync <= vmax && vsync >= vmin); 962 } 963 964 static u32 965 range_pixel_clock(struct edid *edid, u8 *t) 966 { 967 /* unspecified */ 968 if (t[9] == 0 || t[9] == 255) 969 return 0; 970 971 /* 1.4 with CVT support gives us real precision, yay */ 972 if (edid->revision >= 4 && t[10] == 0x04) 973 return (t[9] * 10000) - ((t[12] >> 2) * 250); 974 975 /* 1.3 is pathetic, so fuzz up a bit */ 976 return t[9] * 10000 + 5001; 977 } 978 979 static bool 980 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 981 struct detailed_timing *timing) 982 { 983 u32 max_clock; 984 u8 *t = (u8 *)timing; 985 986 if (!mode_in_hsync_range(mode, edid, t)) 987 return false; 988 989 if (!mode_in_vsync_range(mode, edid, t)) 990 return false; 991 992 if ((max_clock = range_pixel_clock(edid, t))) 993 if (mode->clock > max_clock) 994 return false; 995 996 /* 1.4 max horizontal check */ 997 if (edid->revision >= 4 && t[10] == 0x04) 998 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 999 return false; 1000 1001 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1002 return false; 1003 1004 return true; 1005 } 1006 1007 /* 1008 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 1009 * need to account for them. 1010 */ 1011 static int 1012 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1013 struct detailed_timing *timing) 1014 { 1015 int i, modes = 0; 1016 struct drm_display_mode *newmode; 1017 struct drm_device *dev = connector->dev; 1018 1019 for (i = 0; i < drm_num_dmt_modes; i++) { 1020 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1021 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1022 if (newmode) { 1023 drm_mode_probed_add(connector, newmode); 1024 modes++; 1025 } 1026 } 1027 } 1028 1029 return modes; 1030 } 1031 1032 static void 1033 do_inferred_modes(struct detailed_timing *timing, void *c) 1034 { 1035 struct detailed_mode_closure *closure = c; 1036 struct detailed_non_pixel *data = &timing->data.other_data; 1037 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1038 1039 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1040 closure->modes += drm_gtf_modes_for_range(closure->connector, 1041 closure->edid, 1042 timing); 1043 } 1044 1045 static int 1046 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1047 { 1048 struct detailed_mode_closure closure = { 1049 connector, edid, 0, 0, 0 1050 }; 1051 1052 if (version_greater(edid, 1, 0)) 1053 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1054 &closure); 1055 1056 return closure.modes; 1057 } 1058 1059 static int 1060 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1061 { 1062 int i, j, m, modes = 0; 1063 struct drm_display_mode *mode; 1064 u8 *est = ((u8 *)timing) + 5; 1065 1066 for (i = 0; i < 6; i++) { 1067 for (j = 7; j > 0; j--) { 1068 m = (i * 8) + (7 - j); 1069 if (m >= ARRAY_SIZE(est3_modes)) 1070 break; 1071 if (est[i] & (1 << j)) { 1072 mode = drm_mode_find_dmt(connector->dev, 1073 est3_modes[m].w, 1074 est3_modes[m].h, 1075 est3_modes[m].r 1076 /*, est3_modes[m].rb */); 1077 if (mode) { 1078 drm_mode_probed_add(connector, mode); 1079 modes++; 1080 } 1081 } 1082 } 1083 } 1084 1085 return modes; 1086 } 1087 1088 static void 1089 do_established_modes(struct detailed_timing *timing, void *c) 1090 { 1091 struct detailed_mode_closure *closure = c; 1092 struct detailed_non_pixel *data = &timing->data.other_data; 1093 1094 if (data->type == EDID_DETAIL_EST_TIMINGS) 1095 closure->modes += drm_est3_modes(closure->connector, timing); 1096 } 1097 1098 /** 1099 * add_established_modes - get est. modes from EDID and add them 1100 * @edid: EDID block to scan 1101 * 1102 * Each EDID block contains a bitmap of the supported "established modes" list 1103 * (defined above). Tease them out and add them to the global modes list. 1104 */ 1105 static int 1106 add_established_modes(struct drm_connector *connector, struct edid *edid) 1107 { 1108 struct drm_device *dev = connector->dev; 1109 unsigned long est_bits = edid->established_timings.t1 | 1110 (edid->established_timings.t2 << 8) | 1111 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1112 int i, modes = 0; 1113 struct detailed_mode_closure closure = { 1114 connector, edid, 0, 0, 0 1115 }; 1116 1117 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1118 if (est_bits & (1<<i)) { 1119 struct drm_display_mode *newmode; 1120 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1121 if (newmode) { 1122 drm_mode_probed_add(connector, newmode); 1123 modes++; 1124 } 1125 } 1126 } 1127 1128 if (version_greater(edid, 1, 0)) 1129 drm_for_each_detailed_block((u8 *)edid, 1130 do_established_modes, &closure); 1131 1132 return modes + closure.modes; 1133 } 1134 1135 static void 1136 do_standard_modes(struct detailed_timing *timing, void *c) 1137 { 1138 struct detailed_mode_closure *closure = c; 1139 struct detailed_non_pixel *data = &timing->data.other_data; 1140 struct drm_connector *connector = closure->connector; 1141 struct edid *edid = closure->edid; 1142 1143 if (data->type == EDID_DETAIL_STD_MODES) { 1144 int i; 1145 for (i = 0; i < 6; i++) { 1146 struct std_timing *std; 1147 struct drm_display_mode *newmode; 1148 1149 std = &data->data.timings[i]; 1150 newmode = drm_mode_std(connector, edid, std, 1151 edid->revision); 1152 if (newmode) { 1153 drm_mode_probed_add(connector, newmode); 1154 closure->modes++; 1155 } 1156 } 1157 } 1158 } 1159 1160 /** 1161 * add_standard_modes - get std. modes from EDID and add them 1162 * @edid: EDID block to scan 1163 * 1164 * Standard modes can be calculated using the appropriate standard (DMT, 1165 * GTF or CVT. Grab them from @edid and add them to the list. 1166 */ 1167 static int 1168 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1169 { 1170 int i, modes = 0; 1171 struct detailed_mode_closure closure = { 1172 connector, edid, 0, 0, 0 1173 }; 1174 1175 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1176 struct drm_display_mode *newmode; 1177 1178 newmode = drm_mode_std(connector, edid, 1179 &edid->standard_timings[i], 1180 edid->revision); 1181 if (newmode) { 1182 drm_mode_probed_add(connector, newmode); 1183 modes++; 1184 } 1185 } 1186 1187 if (version_greater(edid, 1, 0)) 1188 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1189 &closure); 1190 1191 /* XXX should also look for standard codes in VTB blocks */ 1192 1193 return modes + closure.modes; 1194 } 1195 1196 static int drm_cvt_modes(struct drm_connector *connector, 1197 struct detailed_timing *timing) 1198 { 1199 int i, j, modes = 0; 1200 struct drm_display_mode *newmode; 1201 struct drm_device *dev = connector->dev; 1202 struct cvt_timing *cvt; 1203 const int rates[] = { 60, 85, 75, 60, 50 }; 1204 const u8 empty[3] = { 0, 0, 0 }; 1205 1206 for (i = 0; i < 4; i++) { 1207 int uninitialized_var(width), height; 1208 cvt = &(timing->data.other_data.data.cvt[i]); 1209 1210 if (!memcmp(cvt->code, empty, 3)) 1211 continue; 1212 1213 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1214 switch (cvt->code[1] & 0x0c) { 1215 case 0x00: 1216 width = height * 4 / 3; 1217 break; 1218 case 0x04: 1219 width = height * 16 / 9; 1220 break; 1221 case 0x08: 1222 width = height * 16 / 10; 1223 break; 1224 case 0x0c: 1225 width = height * 15 / 9; 1226 break; 1227 } 1228 1229 for (j = 1; j < 5; j++) { 1230 if (cvt->code[2] & (1 << j)) { 1231 newmode = drm_cvt_mode(dev, width, height, 1232 rates[j], j == 0, 1233 false, false); 1234 if (newmode) { 1235 drm_mode_probed_add(connector, newmode); 1236 modes++; 1237 } 1238 } 1239 } 1240 } 1241 1242 return modes; 1243 } 1244 1245 static void 1246 do_cvt_mode(struct detailed_timing *timing, void *c) 1247 { 1248 struct detailed_mode_closure *closure = c; 1249 struct detailed_non_pixel *data = &timing->data.other_data; 1250 1251 if (data->type == EDID_DETAIL_CVT_3BYTE) 1252 closure->modes += drm_cvt_modes(closure->connector, timing); 1253 } 1254 1255 static int 1256 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1257 { 1258 struct detailed_mode_closure closure = { 1259 connector, edid, 0, 0, 0 1260 }; 1261 1262 if (version_greater(edid, 1, 2)) 1263 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1264 1265 /* XXX should also look for CVT codes in VTB blocks */ 1266 1267 return closure.modes; 1268 } 1269 1270 static void 1271 do_detailed_mode(struct detailed_timing *timing, void *c) 1272 { 1273 struct detailed_mode_closure *closure = c; 1274 struct drm_display_mode *newmode; 1275 1276 if (timing->pixel_clock) { 1277 newmode = drm_mode_detailed(closure->connector->dev, 1278 closure->edid, timing, 1279 closure->quirks); 1280 if (!newmode) 1281 return; 1282 1283 if (closure->preferred) 1284 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1285 1286 drm_mode_probed_add(closure->connector, newmode); 1287 closure->modes++; 1288 closure->preferred = 0; 1289 } 1290 } 1291 1292 /* 1293 * add_detailed_modes - Add modes from detailed timings 1294 * @connector: attached connector 1295 * @edid: EDID block to scan 1296 * @quirks: quirks to apply 1297 */ 1298 static int 1299 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1300 u32 quirks) 1301 { 1302 struct detailed_mode_closure closure = { 1303 connector, 1304 edid, 1305 1, 1306 quirks, 1307 0 1308 }; 1309 1310 if (closure.preferred && !version_greater(edid, 1, 3)) 1311 closure.preferred = 1312 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1313 1314 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1315 1316 return closure.modes; 1317 } 1318 1319 #define HDMI_IDENTIFIER 0x000C03 1320 #define AUDIO_BLOCK 0x01 1321 #define VENDOR_BLOCK 0x03 1322 #define EDID_BASIC_AUDIO (1 << 6) 1323 1324 /** 1325 * Search EDID for CEA extension block. 1326 */ 1327 u8 *drm_find_cea_extension(struct edid *edid) 1328 { 1329 u8 *edid_ext = NULL; 1330 int i; 1331 1332 /* No EDID or EDID extensions */ 1333 if (edid == NULL || edid->extensions == 0) 1334 return NULL; 1335 1336 /* Find CEA extension */ 1337 for (i = 0; i < edid->extensions; i++) { 1338 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1339 if (edid_ext[0] == CEA_EXT) 1340 break; 1341 } 1342 1343 if (i == edid->extensions) 1344 return NULL; 1345 1346 return edid_ext; 1347 } 1348 EXPORT_SYMBOL(drm_find_cea_extension); 1349 1350 /** 1351 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1352 * @edid: monitor EDID information 1353 * 1354 * Parse the CEA extension according to CEA-861-B. 1355 * Return true if HDMI, false if not or unknown. 1356 */ 1357 bool drm_detect_hdmi_monitor(struct edid *edid) 1358 { 1359 u8 *edid_ext; 1360 int i, hdmi_id; 1361 int start_offset, end_offset; 1362 bool is_hdmi = false; 1363 1364 edid_ext = drm_find_cea_extension(edid); 1365 if (!edid_ext) 1366 goto end; 1367 1368 /* Data block offset in CEA extension block */ 1369 start_offset = 4; 1370 end_offset = edid_ext[2]; 1371 1372 /* 1373 * Because HDMI identifier is in Vendor Specific Block, 1374 * search it from all data blocks of CEA extension. 1375 */ 1376 for (i = start_offset; i < end_offset; 1377 /* Increased by data block len */ 1378 i += ((edid_ext[i] & 0x1f) + 1)) { 1379 /* Find vendor specific block */ 1380 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1381 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1382 edid_ext[i + 3] << 16; 1383 /* Find HDMI identifier */ 1384 if (hdmi_id == HDMI_IDENTIFIER) 1385 is_hdmi = true; 1386 break; 1387 } 1388 } 1389 1390 end: 1391 return is_hdmi; 1392 } 1393 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1394 1395 /** 1396 * drm_detect_monitor_audio - check monitor audio capability 1397 * 1398 * Monitor should have CEA extension block. 1399 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1400 * audio' only. If there is any audio extension block and supported 1401 * audio format, assume at least 'basic audio' support, even if 'basic 1402 * audio' is not defined in EDID. 1403 * 1404 */ 1405 bool drm_detect_monitor_audio(struct edid *edid) 1406 { 1407 u8 *edid_ext; 1408 int i, j; 1409 bool has_audio = false; 1410 int start_offset, end_offset; 1411 1412 edid_ext = drm_find_cea_extension(edid); 1413 if (!edid_ext) 1414 goto end; 1415 1416 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1417 1418 if (has_audio) { 1419 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1420 goto end; 1421 } 1422 1423 /* Data block offset in CEA extension block */ 1424 start_offset = 4; 1425 end_offset = edid_ext[2]; 1426 1427 for (i = start_offset; i < end_offset; 1428 i += ((edid_ext[i] & 0x1f) + 1)) { 1429 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1430 has_audio = true; 1431 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1432 DRM_DEBUG_KMS("CEA audio format %d\n", 1433 (edid_ext[i + j] >> 3) & 0xf); 1434 goto end; 1435 } 1436 } 1437 end: 1438 return has_audio; 1439 } 1440 EXPORT_SYMBOL(drm_detect_monitor_audio); 1441 1442 /** 1443 * drm_add_display_info - pull display info out if present 1444 * @edid: EDID data 1445 * @info: display info (attached to connector) 1446 * 1447 * Grab any available display info and stuff it into the drm_display_info 1448 * structure that's part of the connector. Useful for tracking bpp and 1449 * color spaces. 1450 */ 1451 static void drm_add_display_info(struct edid *edid, 1452 struct drm_display_info *info) 1453 { 1454 u8 *edid_ext; 1455 1456 info->width_mm = edid->width_cm * 10; 1457 info->height_mm = edid->height_cm * 10; 1458 1459 /* driver figures it out in this case */ 1460 info->bpc = 0; 1461 info->color_formats = 0; 1462 1463 /* Only defined for 1.4 with digital displays */ 1464 if (edid->revision < 4) 1465 return; 1466 1467 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1468 return; 1469 1470 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1471 case DRM_EDID_DIGITAL_DEPTH_6: 1472 info->bpc = 6; 1473 break; 1474 case DRM_EDID_DIGITAL_DEPTH_8: 1475 info->bpc = 8; 1476 break; 1477 case DRM_EDID_DIGITAL_DEPTH_10: 1478 info->bpc = 10; 1479 break; 1480 case DRM_EDID_DIGITAL_DEPTH_12: 1481 info->bpc = 12; 1482 break; 1483 case DRM_EDID_DIGITAL_DEPTH_14: 1484 info->bpc = 14; 1485 break; 1486 case DRM_EDID_DIGITAL_DEPTH_16: 1487 info->bpc = 16; 1488 break; 1489 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1490 default: 1491 info->bpc = 0; 1492 break; 1493 } 1494 1495 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1496 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1497 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1498 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1499 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1500 1501 /* Get data from CEA blocks if present */ 1502 edid_ext = drm_find_cea_extension(edid); 1503 if (!edid_ext) 1504 return; 1505 1506 info->cea_rev = edid_ext[1]; 1507 } 1508 1509 /** 1510 * drm_add_edid_modes - add modes from EDID data, if available 1511 * @connector: connector we're probing 1512 * @edid: edid data 1513 * 1514 * Add the specified modes to the connector's mode list. 1515 * 1516 * Return number of modes added or 0 if we couldn't find any. 1517 */ 1518 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1519 { 1520 int num_modes = 0; 1521 u32 quirks; 1522 1523 if (edid == NULL) { 1524 return 0; 1525 } 1526 if (!drm_edid_is_valid(edid)) { 1527 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1528 drm_get_connector_name(connector)); 1529 return 0; 1530 } 1531 1532 quirks = edid_get_quirks(edid); 1533 1534 /* 1535 * EDID spec says modes should be preferred in this order: 1536 * - preferred detailed mode 1537 * - other detailed modes from base block 1538 * - detailed modes from extension blocks 1539 * - CVT 3-byte code modes 1540 * - standard timing codes 1541 * - established timing codes 1542 * - modes inferred from GTF or CVT range information 1543 * 1544 * We get this pretty much right. 1545 * 1546 * XXX order for additional mode types in extension blocks? 1547 */ 1548 num_modes += add_detailed_modes(connector, edid, quirks); 1549 num_modes += add_cvt_modes(connector, edid); 1550 num_modes += add_standard_modes(connector, edid); 1551 num_modes += add_established_modes(connector, edid); 1552 num_modes += add_inferred_modes(connector, edid); 1553 1554 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1555 edid_fixup_preferred(connector, quirks); 1556 1557 drm_add_display_info(edid, &connector->display_info); 1558 1559 return num_modes; 1560 } 1561 EXPORT_SYMBOL(drm_add_edid_modes); 1562 1563 /** 1564 * drm_add_modes_noedid - add modes for the connectors without EDID 1565 * @connector: connector we're probing 1566 * @hdisplay: the horizontal display limit 1567 * @vdisplay: the vertical display limit 1568 * 1569 * Add the specified modes to the connector's mode list. Only when the 1570 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1571 * 1572 * Return number of modes added or 0 if we couldn't find any. 1573 */ 1574 int drm_add_modes_noedid(struct drm_connector *connector, 1575 int hdisplay, int vdisplay) 1576 { 1577 int i, count, num_modes = 0; 1578 struct drm_display_mode *mode; 1579 struct drm_device *dev = connector->dev; 1580 1581 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1582 if (hdisplay < 0) 1583 hdisplay = 0; 1584 if (vdisplay < 0) 1585 vdisplay = 0; 1586 1587 for (i = 0; i < count; i++) { 1588 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1589 if (hdisplay && vdisplay) { 1590 /* 1591 * Only when two are valid, they will be used to check 1592 * whether the mode should be added to the mode list of 1593 * the connector. 1594 */ 1595 if (ptr->hdisplay > hdisplay || 1596 ptr->vdisplay > vdisplay) 1597 continue; 1598 } 1599 if (drm_mode_vrefresh(ptr) > 61) 1600 continue; 1601 mode = drm_mode_duplicate(dev, ptr); 1602 if (mode) { 1603 drm_mode_probed_add(connector, mode); 1604 num_modes++; 1605 } 1606 } 1607 return num_modes; 1608 } 1609 EXPORT_SYMBOL(drm_add_modes_noedid); 1610