drm_edid.c revision da05a5a71ad8fc7c51d526151be193b7ef6e6c95
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 69struct 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 82static 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 126static const u8 edid_header[] = { 127 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 128}; 129 130/* 131 * Sanity check the EDID block (base or extension). Return 0 if the block 132 * doesn't check out, or 1 if it's valid. 133 */ 134static bool 135drm_edid_block_valid(u8 *raw_edid) 136{ 137 int i; 138 u8 csum = 0; 139 struct edid *edid = (struct edid *)raw_edid; 140 141 if (raw_edid[0] == 0x00) { 142 int score = 0; 143 144 for (i = 0; i < sizeof(edid_header); i++) 145 if (raw_edid[i] == edid_header[i]) 146 score++; 147 148 if (score == 8) ; 149 else if (score >= 6) { 150 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 151 memcpy(raw_edid, edid_header, sizeof(edid_header)); 152 } else { 153 goto bad; 154 } 155 } 156 157 for (i = 0; i < EDID_LENGTH; i++) 158 csum += raw_edid[i]; 159 if (csum) { 160 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 161 162 /* allow CEA to slide through, switches mangle this */ 163 if (raw_edid[0] != 0x02) 164 goto bad; 165 } 166 167 /* per-block-type checks */ 168 switch (raw_edid[0]) { 169 case 0: /* base */ 170 if (edid->version != 1) { 171 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 172 goto bad; 173 } 174 175 if (edid->revision > 4) 176 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 177 break; 178 179 default: 180 break; 181 } 182 183 return 1; 184 185bad: 186 if (raw_edid) { 187 DRM_ERROR("Raw EDID:\n"); 188 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH); 189 printk("\n"); 190 } 191 return 0; 192} 193 194/** 195 * drm_edid_is_valid - sanity check EDID data 196 * @edid: EDID data 197 * 198 * Sanity-check an entire EDID record (including extensions) 199 */ 200bool drm_edid_is_valid(struct edid *edid) 201{ 202 int i; 203 u8 *raw = (u8 *)edid; 204 205 if (!edid) 206 return false; 207 208 for (i = 0; i <= edid->extensions; i++) 209 if (!drm_edid_block_valid(raw + i * EDID_LENGTH)) 210 return false; 211 212 return true; 213} 214EXPORT_SYMBOL(drm_edid_is_valid); 215 216#define DDC_ADDR 0x50 217#define DDC_SEGMENT_ADDR 0x30 218/** 219 * Get EDID information via I2C. 220 * 221 * \param adapter : i2c device adaptor 222 * \param buf : EDID data buffer to be filled 223 * \param len : EDID data buffer length 224 * \return 0 on success or -1 on failure. 225 * 226 * Try to fetch EDID information by calling i2c driver function. 227 */ 228static int 229drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, 230 int block, int len) 231{ 232 unsigned char start = block * EDID_LENGTH; 233 int ret, retries = 5; 234 235 /* The core i2c driver will automatically retry the transfer if the 236 * adapter reports EAGAIN. However, we find that bit-banging transfers 237 * are susceptible to errors under a heavily loaded machine and 238 * generate spurious NAKs and timeouts. Retrying the transfer 239 * of the individual block a few times seems to overcome this. 240 */ 241 do { 242 struct i2c_msg msgs[] = { 243 { 244 .addr = DDC_ADDR, 245 .flags = 0, 246 .len = 1, 247 .buf = &start, 248 }, { 249 .addr = DDC_ADDR, 250 .flags = I2C_M_RD, 251 .len = len, 252 .buf = buf, 253 } 254 }; 255 ret = i2c_transfer(adapter, msgs, 2); 256 } while (ret != 2 && --retries); 257 258 return ret == 2 ? 0 : -1; 259} 260 261static u8 * 262drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 263{ 264 int i, j = 0, valid_extensions = 0; 265 u8 *block, *new; 266 267 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 268 return NULL; 269 270 /* base block fetch */ 271 for (i = 0; i < 4; i++) { 272 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 273 goto out; 274 if (drm_edid_block_valid(block)) 275 break; 276 } 277 if (i == 4) 278 goto carp; 279 280 /* if there's no extensions, we're done */ 281 if (block[0x7e] == 0) 282 return block; 283 284 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 285 if (!new) 286 goto out; 287 block = new; 288 289 for (j = 1; j <= block[0x7e]; j++) { 290 for (i = 0; i < 4; i++) { 291 if (drm_do_probe_ddc_edid(adapter, 292 block + (valid_extensions + 1) * EDID_LENGTH, 293 j, EDID_LENGTH)) 294 goto out; 295 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 296 valid_extensions++; 297 break; 298 } 299 } 300 if (i == 4) 301 dev_warn(connector->dev->dev, 302 "%s: Ignoring invalid EDID block %d.\n", 303 drm_get_connector_name(connector), j); 304 } 305 306 if (valid_extensions != block[0x7e]) { 307 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 308 block[0x7e] = valid_extensions; 309 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 310 if (!new) 311 goto out; 312 block = new; 313 } 314 315 return block; 316 317carp: 318 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 319 drm_get_connector_name(connector), j); 320 321out: 322 kfree(block); 323 return NULL; 324} 325 326/** 327 * Probe DDC presence. 328 * 329 * \param adapter : i2c device adaptor 330 * \return 1 on success 331 */ 332static bool 333drm_probe_ddc(struct i2c_adapter *adapter) 334{ 335 unsigned char out; 336 337 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 338} 339 340/** 341 * drm_get_edid - get EDID data, if available 342 * @connector: connector we're probing 343 * @adapter: i2c adapter to use for DDC 344 * 345 * Poke the given i2c channel to grab EDID data if possible. If found, 346 * attach it to the connector. 347 * 348 * Return edid data or NULL if we couldn't find any. 349 */ 350struct edid *drm_get_edid(struct drm_connector *connector, 351 struct i2c_adapter *adapter) 352{ 353 struct edid *edid = NULL; 354 355 if (drm_probe_ddc(adapter)) 356 edid = (struct edid *)drm_do_get_edid(connector, adapter); 357 358 connector->display_info.raw_edid = (char *)edid; 359 360 return edid; 361 362} 363EXPORT_SYMBOL(drm_get_edid); 364 365/*** EDID parsing ***/ 366 367/** 368 * edid_vendor - match a string against EDID's obfuscated vendor field 369 * @edid: EDID to match 370 * @vendor: vendor string 371 * 372 * Returns true if @vendor is in @edid, false otherwise 373 */ 374static bool edid_vendor(struct edid *edid, char *vendor) 375{ 376 char edid_vendor[3]; 377 378 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 379 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 380 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 381 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 382 383 return !strncmp(edid_vendor, vendor, 3); 384} 385 386/** 387 * edid_get_quirks - return quirk flags for a given EDID 388 * @edid: EDID to process 389 * 390 * This tells subsequent routines what fixes they need to apply. 391 */ 392static u32 edid_get_quirks(struct edid *edid) 393{ 394 struct edid_quirk *quirk; 395 int i; 396 397 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 398 quirk = &edid_quirk_list[i]; 399 400 if (edid_vendor(edid, quirk->vendor) && 401 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 402 return quirk->quirks; 403 } 404 405 return 0; 406} 407 408#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 409#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 410 411/** 412 * edid_fixup_preferred - set preferred modes based on quirk list 413 * @connector: has mode list to fix up 414 * @quirks: quirks list 415 * 416 * Walk the mode list for @connector, clearing the preferred status 417 * on existing modes and setting it anew for the right mode ala @quirks. 418 */ 419static void edid_fixup_preferred(struct drm_connector *connector, 420 u32 quirks) 421{ 422 struct drm_display_mode *t, *cur_mode, *preferred_mode; 423 int target_refresh = 0; 424 425 if (list_empty(&connector->probed_modes)) 426 return; 427 428 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 429 target_refresh = 60; 430 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 431 target_refresh = 75; 432 433 preferred_mode = list_first_entry(&connector->probed_modes, 434 struct drm_display_mode, head); 435 436 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 437 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 438 439 if (cur_mode == preferred_mode) 440 continue; 441 442 /* Largest mode is preferred */ 443 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 444 preferred_mode = cur_mode; 445 446 /* At a given size, try to get closest to target refresh */ 447 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 448 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 449 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 450 preferred_mode = cur_mode; 451 } 452 } 453 454 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 455} 456 457struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 458 int hsize, int vsize, int fresh) 459{ 460 struct drm_display_mode *mode = NULL; 461 int i; 462 463 for (i = 0; i < drm_num_dmt_modes; i++) { 464 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 465 if (hsize == ptr->hdisplay && 466 vsize == ptr->vdisplay && 467 fresh == drm_mode_vrefresh(ptr)) { 468 /* get the expected default mode */ 469 mode = drm_mode_duplicate(dev, ptr); 470 break; 471 } 472 } 473 return mode; 474} 475EXPORT_SYMBOL(drm_mode_find_dmt); 476 477typedef void detailed_cb(struct detailed_timing *timing, void *closure); 478 479static void 480cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 481{ 482 int i, n = 0; 483 u8 rev = ext[0x01], d = ext[0x02]; 484 u8 *det_base = ext + d; 485 486 switch (rev) { 487 case 0: 488 /* can't happen */ 489 return; 490 case 1: 491 /* have to infer how many blocks we have, check pixel clock */ 492 for (i = 0; i < 6; i++) 493 if (det_base[18*i] || det_base[18*i+1]) 494 n++; 495 break; 496 default: 497 /* explicit count */ 498 n = min(ext[0x03] & 0x0f, 6); 499 break; 500 } 501 502 for (i = 0; i < n; i++) 503 cb((struct detailed_timing *)(det_base + 18 * i), closure); 504} 505 506static void 507vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 508{ 509 unsigned int i, n = min((int)ext[0x02], 6); 510 u8 *det_base = ext + 5; 511 512 if (ext[0x01] != 1) 513 return; /* unknown version */ 514 515 for (i = 0; i < n; i++) 516 cb((struct detailed_timing *)(det_base + 18 * i), closure); 517} 518 519static void 520drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 521{ 522 int i; 523 struct edid *edid = (struct edid *)raw_edid; 524 525 if (edid == NULL) 526 return; 527 528 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 529 cb(&(edid->detailed_timings[i]), closure); 530 531 for (i = 1; i <= raw_edid[0x7e]; i++) { 532 u8 *ext = raw_edid + (i * EDID_LENGTH); 533 switch (*ext) { 534 case CEA_EXT: 535 cea_for_each_detailed_block(ext, cb, closure); 536 break; 537 case VTB_EXT: 538 vtb_for_each_detailed_block(ext, cb, closure); 539 break; 540 default: 541 break; 542 } 543 } 544} 545 546static void 547is_rb(struct detailed_timing *t, void *data) 548{ 549 u8 *r = (u8 *)t; 550 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 551 if (r[15] & 0x10) 552 *(bool *)data = true; 553} 554 555/* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 556static bool 557drm_monitor_supports_rb(struct edid *edid) 558{ 559 if (edid->revision >= 4) { 560 bool ret; 561 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 562 return ret; 563 } 564 565 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 566} 567 568static void 569find_gtf2(struct detailed_timing *t, void *data) 570{ 571 u8 *r = (u8 *)t; 572 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 573 *(u8 **)data = r; 574} 575 576/* Secondary GTF curve kicks in above some break frequency */ 577static int 578drm_gtf2_hbreak(struct edid *edid) 579{ 580 u8 *r = NULL; 581 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 582 return r ? (r[12] * 2) : 0; 583} 584 585static int 586drm_gtf2_2c(struct edid *edid) 587{ 588 u8 *r = NULL; 589 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 590 return r ? r[13] : 0; 591} 592 593static int 594drm_gtf2_m(struct edid *edid) 595{ 596 u8 *r = NULL; 597 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 598 return r ? (r[15] << 8) + r[14] : 0; 599} 600 601static int 602drm_gtf2_k(struct edid *edid) 603{ 604 u8 *r = NULL; 605 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 606 return r ? r[16] : 0; 607} 608 609static int 610drm_gtf2_2j(struct edid *edid) 611{ 612 u8 *r = NULL; 613 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 614 return r ? r[17] : 0; 615} 616 617/** 618 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 619 * @edid: EDID block to scan 620 */ 621static int standard_timing_level(struct edid *edid) 622{ 623 if (edid->revision >= 2) { 624 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 625 return LEVEL_CVT; 626 if (drm_gtf2_hbreak(edid)) 627 return LEVEL_GTF2; 628 return LEVEL_GTF; 629 } 630 return LEVEL_DMT; 631} 632 633/* 634 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 635 * monitors fill with ascii space (0x20) instead. 636 */ 637static int 638bad_std_timing(u8 a, u8 b) 639{ 640 return (a == 0x00 && b == 0x00) || 641 (a == 0x01 && b == 0x01) || 642 (a == 0x20 && b == 0x20); 643} 644 645/** 646 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 647 * @t: standard timing params 648 * @timing_level: standard timing level 649 * 650 * Take the standard timing params (in this case width, aspect, and refresh) 651 * and convert them into a real mode using CVT/GTF/DMT. 652 */ 653static struct drm_display_mode * 654drm_mode_std(struct drm_connector *connector, struct edid *edid, 655 struct std_timing *t, int revision) 656{ 657 struct drm_device *dev = connector->dev; 658 struct drm_display_mode *m, *mode = NULL; 659 int hsize, vsize; 660 int vrefresh_rate; 661 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 662 >> EDID_TIMING_ASPECT_SHIFT; 663 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 664 >> EDID_TIMING_VFREQ_SHIFT; 665 int timing_level = standard_timing_level(edid); 666 667 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 668 return NULL; 669 670 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 671 hsize = t->hsize * 8 + 248; 672 /* vrefresh_rate = vfreq + 60 */ 673 vrefresh_rate = vfreq + 60; 674 /* the vdisplay is calculated based on the aspect ratio */ 675 if (aspect_ratio == 0) { 676 if (revision < 3) 677 vsize = hsize; 678 else 679 vsize = (hsize * 10) / 16; 680 } else if (aspect_ratio == 1) 681 vsize = (hsize * 3) / 4; 682 else if (aspect_ratio == 2) 683 vsize = (hsize * 4) / 5; 684 else 685 vsize = (hsize * 9) / 16; 686 687 /* HDTV hack, part 1 */ 688 if (vrefresh_rate == 60 && 689 ((hsize == 1360 && vsize == 765) || 690 (hsize == 1368 && vsize == 769))) { 691 hsize = 1366; 692 vsize = 768; 693 } 694 695 /* 696 * If this connector already has a mode for this size and refresh 697 * rate (because it came from detailed or CVT info), use that 698 * instead. This way we don't have to guess at interlace or 699 * reduced blanking. 700 */ 701 list_for_each_entry(m, &connector->probed_modes, head) 702 if (m->hdisplay == hsize && m->vdisplay == vsize && 703 drm_mode_vrefresh(m) == vrefresh_rate) 704 return NULL; 705 706 /* HDTV hack, part 2 */ 707 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 708 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 709 false); 710 mode->hdisplay = 1366; 711 mode->hsync_start = mode->hsync_start - 1; 712 mode->hsync_end = mode->hsync_end - 1; 713 return mode; 714 } 715 716 /* check whether it can be found in default mode table */ 717 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 718 if (mode) 719 return mode; 720 721 switch (timing_level) { 722 case LEVEL_DMT: 723 break; 724 case LEVEL_GTF: 725 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 726 break; 727 case LEVEL_GTF2: 728 /* 729 * This is potentially wrong if there's ever a monitor with 730 * more than one ranges section, each claiming a different 731 * secondary GTF curve. Please don't do that. 732 */ 733 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 734 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 735 kfree(mode); 736 mode = drm_gtf_mode_complex(dev, hsize, vsize, 737 vrefresh_rate, 0, 0, 738 drm_gtf2_m(edid), 739 drm_gtf2_2c(edid), 740 drm_gtf2_k(edid), 741 drm_gtf2_2j(edid)); 742 } 743 break; 744 case LEVEL_CVT: 745 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 746 false); 747 break; 748 } 749 return mode; 750} 751 752/* 753 * EDID is delightfully ambiguous about how interlaced modes are to be 754 * encoded. Our internal representation is of frame height, but some 755 * HDTV detailed timings are encoded as field height. 756 * 757 * The format list here is from CEA, in frame size. Technically we 758 * should be checking refresh rate too. Whatever. 759 */ 760static void 761drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 762 struct detailed_pixel_timing *pt) 763{ 764 int i; 765 static const struct { 766 int w, h; 767 } cea_interlaced[] = { 768 { 1920, 1080 }, 769 { 720, 480 }, 770 { 1440, 480 }, 771 { 2880, 480 }, 772 { 720, 576 }, 773 { 1440, 576 }, 774 { 2880, 576 }, 775 }; 776 777 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 778 return; 779 780 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 781 if ((mode->hdisplay == cea_interlaced[i].w) && 782 (mode->vdisplay == cea_interlaced[i].h / 2)) { 783 mode->vdisplay *= 2; 784 mode->vsync_start *= 2; 785 mode->vsync_end *= 2; 786 mode->vtotal *= 2; 787 mode->vtotal |= 1; 788 } 789 } 790 791 mode->flags |= DRM_MODE_FLAG_INTERLACE; 792} 793 794/** 795 * drm_mode_detailed - create a new mode from an EDID detailed timing section 796 * @dev: DRM device (needed to create new mode) 797 * @edid: EDID block 798 * @timing: EDID detailed timing info 799 * @quirks: quirks to apply 800 * 801 * An EDID detailed timing block contains enough info for us to create and 802 * return a new struct drm_display_mode. 803 */ 804static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 805 struct edid *edid, 806 struct detailed_timing *timing, 807 u32 quirks) 808{ 809 struct drm_display_mode *mode; 810 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 811 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 812 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 813 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 814 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 815 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 816 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 817 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 818 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 819 820 /* ignore tiny modes */ 821 if (hactive < 64 || vactive < 64) 822 return NULL; 823 824 if (pt->misc & DRM_EDID_PT_STEREO) { 825 printk(KERN_WARNING "stereo mode not supported\n"); 826 return NULL; 827 } 828 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 829 printk(KERN_WARNING "composite sync not supported\n"); 830 } 831 832 /* it is incorrect if hsync/vsync width is zero */ 833 if (!hsync_pulse_width || !vsync_pulse_width) { 834 DRM_DEBUG_KMS("Incorrect Detailed timing. " 835 "Wrong Hsync/Vsync pulse width\n"); 836 return NULL; 837 } 838 mode = drm_mode_create(dev); 839 if (!mode) 840 return NULL; 841 842 mode->type = DRM_MODE_TYPE_DRIVER; 843 844 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 845 timing->pixel_clock = cpu_to_le16(1088); 846 847 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 848 849 mode->hdisplay = hactive; 850 mode->hsync_start = mode->hdisplay + hsync_offset; 851 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 852 mode->htotal = mode->hdisplay + hblank; 853 854 mode->vdisplay = vactive; 855 mode->vsync_start = mode->vdisplay + vsync_offset; 856 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 857 mode->vtotal = mode->vdisplay + vblank; 858 859 /* Some EDIDs have bogus h/vtotal values */ 860 if (mode->hsync_end > mode->htotal) 861 mode->htotal = mode->hsync_end + 1; 862 if (mode->vsync_end > mode->vtotal) 863 mode->vtotal = mode->vsync_end + 1; 864 865 drm_mode_do_interlace_quirk(mode, pt); 866 867 drm_mode_set_name(mode); 868 869 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 870 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 871 } 872 873 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 874 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 875 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 876 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 877 878 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 879 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 880 881 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 882 mode->width_mm *= 10; 883 mode->height_mm *= 10; 884 } 885 886 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 887 mode->width_mm = edid->width_cm * 10; 888 mode->height_mm = edid->height_cm * 10; 889 } 890 891 return mode; 892} 893 894static bool 895mode_is_rb(const struct drm_display_mode *mode) 896{ 897 return (mode->htotal - mode->hdisplay == 160) && 898 (mode->hsync_end - mode->hdisplay == 80) && 899 (mode->hsync_end - mode->hsync_start == 32) && 900 (mode->vsync_start - mode->vdisplay == 3); 901} 902 903static bool 904mode_in_hsync_range(const struct drm_display_mode *mode, 905 struct edid *edid, u8 *t) 906{ 907 int hsync, hmin, hmax; 908 909 hmin = t[7]; 910 if (edid->revision >= 4) 911 hmin += ((t[4] & 0x04) ? 255 : 0); 912 hmax = t[8]; 913 if (edid->revision >= 4) 914 hmax += ((t[4] & 0x08) ? 255 : 0); 915 hsync = drm_mode_hsync(mode); 916 917 return (hsync <= hmax && hsync >= hmin); 918} 919 920static bool 921mode_in_vsync_range(const struct drm_display_mode *mode, 922 struct edid *edid, u8 *t) 923{ 924 int vsync, vmin, vmax; 925 926 vmin = t[5]; 927 if (edid->revision >= 4) 928 vmin += ((t[4] & 0x01) ? 255 : 0); 929 vmax = t[6]; 930 if (edid->revision >= 4) 931 vmax += ((t[4] & 0x02) ? 255 : 0); 932 vsync = drm_mode_vrefresh(mode); 933 934 return (vsync <= vmax && vsync >= vmin); 935} 936 937static u32 938range_pixel_clock(struct edid *edid, u8 *t) 939{ 940 /* unspecified */ 941 if (t[9] == 0 || t[9] == 255) 942 return 0; 943 944 /* 1.4 with CVT support gives us real precision, yay */ 945 if (edid->revision >= 4 && t[10] == 0x04) 946 return (t[9] * 10000) - ((t[12] >> 2) * 250); 947 948 /* 1.3 is pathetic, so fuzz up a bit */ 949 return t[9] * 10000 + 5001; 950} 951 952static bool 953mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 954 struct detailed_timing *timing) 955{ 956 u32 max_clock; 957 u8 *t = (u8 *)timing; 958 959 if (!mode_in_hsync_range(mode, edid, t)) 960 return false; 961 962 if (!mode_in_vsync_range(mode, edid, t)) 963 return false; 964 965 if ((max_clock = range_pixel_clock(edid, t))) 966 if (mode->clock > max_clock) 967 return false; 968 969 /* 1.4 max horizontal check */ 970 if (edid->revision >= 4 && t[10] == 0x04) 971 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 972 return false; 973 974 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 975 return false; 976 977 return true; 978} 979 980/* 981 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 982 * need to account for them. 983 */ 984static int 985drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 986 struct detailed_timing *timing) 987{ 988 int i, modes = 0; 989 struct drm_display_mode *newmode; 990 struct drm_device *dev = connector->dev; 991 992 for (i = 0; i < drm_num_dmt_modes; i++) { 993 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 994 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 995 if (newmode) { 996 drm_mode_probed_add(connector, newmode); 997 modes++; 998 } 999 } 1000 } 1001 1002 return modes; 1003} 1004 1005static void 1006do_inferred_modes(struct detailed_timing *timing, void *c) 1007{ 1008 struct detailed_mode_closure *closure = c; 1009 struct detailed_non_pixel *data = &timing->data.other_data; 1010 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1011 1012 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1013 closure->modes += drm_gtf_modes_for_range(closure->connector, 1014 closure->edid, 1015 timing); 1016} 1017 1018static int 1019add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1020{ 1021 struct detailed_mode_closure closure = { 1022 connector, edid, 0, 0, 0 1023 }; 1024 1025 if (version_greater(edid, 1, 0)) 1026 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1027 &closure); 1028 1029 return closure.modes; 1030} 1031 1032static int 1033drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1034{ 1035 int i, j, m, modes = 0; 1036 struct drm_display_mode *mode; 1037 u8 *est = ((u8 *)timing) + 5; 1038 1039 for (i = 0; i < 6; i++) { 1040 for (j = 7; j > 0; j--) { 1041 m = (i * 8) + (7 - j); 1042 if (m >= ARRAY_SIZE(est3_modes)) 1043 break; 1044 if (est[i] & (1 << j)) { 1045 mode = drm_mode_find_dmt(connector->dev, 1046 est3_modes[m].w, 1047 est3_modes[m].h, 1048 est3_modes[m].r 1049 /*, est3_modes[m].rb */); 1050 if (mode) { 1051 drm_mode_probed_add(connector, mode); 1052 modes++; 1053 } 1054 } 1055 } 1056 } 1057 1058 return modes; 1059} 1060 1061static void 1062do_established_modes(struct detailed_timing *timing, void *c) 1063{ 1064 struct detailed_mode_closure *closure = c; 1065 struct detailed_non_pixel *data = &timing->data.other_data; 1066 1067 if (data->type == EDID_DETAIL_EST_TIMINGS) 1068 closure->modes += drm_est3_modes(closure->connector, timing); 1069} 1070 1071/** 1072 * add_established_modes - get est. modes from EDID and add them 1073 * @edid: EDID block to scan 1074 * 1075 * Each EDID block contains a bitmap of the supported "established modes" list 1076 * (defined above). Tease them out and add them to the global modes list. 1077 */ 1078static int 1079add_established_modes(struct drm_connector *connector, struct edid *edid) 1080{ 1081 struct drm_device *dev = connector->dev; 1082 unsigned long est_bits = edid->established_timings.t1 | 1083 (edid->established_timings.t2 << 8) | 1084 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1085 int i, modes = 0; 1086 struct detailed_mode_closure closure = { 1087 connector, edid, 0, 0, 0 1088 }; 1089 1090 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1091 if (est_bits & (1<<i)) { 1092 struct drm_display_mode *newmode; 1093 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1094 if (newmode) { 1095 drm_mode_probed_add(connector, newmode); 1096 modes++; 1097 } 1098 } 1099 } 1100 1101 if (version_greater(edid, 1, 0)) 1102 drm_for_each_detailed_block((u8 *)edid, 1103 do_established_modes, &closure); 1104 1105 return modes + closure.modes; 1106} 1107 1108static void 1109do_standard_modes(struct detailed_timing *timing, void *c) 1110{ 1111 struct detailed_mode_closure *closure = c; 1112 struct detailed_non_pixel *data = &timing->data.other_data; 1113 struct drm_connector *connector = closure->connector; 1114 struct edid *edid = closure->edid; 1115 1116 if (data->type == EDID_DETAIL_STD_MODES) { 1117 int i; 1118 for (i = 0; i < 6; i++) { 1119 struct std_timing *std; 1120 struct drm_display_mode *newmode; 1121 1122 std = &data->data.timings[i]; 1123 newmode = drm_mode_std(connector, edid, std, 1124 edid->revision); 1125 if (newmode) { 1126 drm_mode_probed_add(connector, newmode); 1127 closure->modes++; 1128 } 1129 } 1130 } 1131} 1132 1133/** 1134 * add_standard_modes - get std. modes from EDID and add them 1135 * @edid: EDID block to scan 1136 * 1137 * Standard modes can be calculated using the appropriate standard (DMT, 1138 * GTF or CVT. Grab them from @edid and add them to the list. 1139 */ 1140static int 1141add_standard_modes(struct drm_connector *connector, struct edid *edid) 1142{ 1143 int i, modes = 0; 1144 struct detailed_mode_closure closure = { 1145 connector, edid, 0, 0, 0 1146 }; 1147 1148 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1149 struct drm_display_mode *newmode; 1150 1151 newmode = drm_mode_std(connector, edid, 1152 &edid->standard_timings[i], 1153 edid->revision); 1154 if (newmode) { 1155 drm_mode_probed_add(connector, newmode); 1156 modes++; 1157 } 1158 } 1159 1160 if (version_greater(edid, 1, 0)) 1161 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1162 &closure); 1163 1164 /* XXX should also look for standard codes in VTB blocks */ 1165 1166 return modes + closure.modes; 1167} 1168 1169static int drm_cvt_modes(struct drm_connector *connector, 1170 struct detailed_timing *timing) 1171{ 1172 int i, j, modes = 0; 1173 struct drm_display_mode *newmode; 1174 struct drm_device *dev = connector->dev; 1175 struct cvt_timing *cvt; 1176 const int rates[] = { 60, 85, 75, 60, 50 }; 1177 const u8 empty[3] = { 0, 0, 0 }; 1178 1179 for (i = 0; i < 4; i++) { 1180 int uninitialized_var(width), height; 1181 cvt = &(timing->data.other_data.data.cvt[i]); 1182 1183 if (!memcmp(cvt->code, empty, 3)) 1184 continue; 1185 1186 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1187 switch (cvt->code[1] & 0x0c) { 1188 case 0x00: 1189 width = height * 4 / 3; 1190 break; 1191 case 0x04: 1192 width = height * 16 / 9; 1193 break; 1194 case 0x08: 1195 width = height * 16 / 10; 1196 break; 1197 case 0x0c: 1198 width = height * 15 / 9; 1199 break; 1200 } 1201 1202 for (j = 1; j < 5; j++) { 1203 if (cvt->code[2] & (1 << j)) { 1204 newmode = drm_cvt_mode(dev, width, height, 1205 rates[j], j == 0, 1206 false, false); 1207 if (newmode) { 1208 drm_mode_probed_add(connector, newmode); 1209 modes++; 1210 } 1211 } 1212 } 1213 } 1214 1215 return modes; 1216} 1217 1218static void 1219do_cvt_mode(struct detailed_timing *timing, void *c) 1220{ 1221 struct detailed_mode_closure *closure = c; 1222 struct detailed_non_pixel *data = &timing->data.other_data; 1223 1224 if (data->type == EDID_DETAIL_CVT_3BYTE) 1225 closure->modes += drm_cvt_modes(closure->connector, timing); 1226} 1227 1228static int 1229add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1230{ 1231 struct detailed_mode_closure closure = { 1232 connector, edid, 0, 0, 0 1233 }; 1234 1235 if (version_greater(edid, 1, 2)) 1236 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1237 1238 /* XXX should also look for CVT codes in VTB blocks */ 1239 1240 return closure.modes; 1241} 1242 1243static void 1244do_detailed_mode(struct detailed_timing *timing, void *c) 1245{ 1246 struct detailed_mode_closure *closure = c; 1247 struct drm_display_mode *newmode; 1248 1249 if (timing->pixel_clock) { 1250 newmode = drm_mode_detailed(closure->connector->dev, 1251 closure->edid, timing, 1252 closure->quirks); 1253 if (!newmode) 1254 return; 1255 1256 if (closure->preferred) 1257 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1258 1259 drm_mode_probed_add(closure->connector, newmode); 1260 closure->modes++; 1261 closure->preferred = 0; 1262 } 1263} 1264 1265/* 1266 * add_detailed_modes - Add modes from detailed timings 1267 * @connector: attached connector 1268 * @edid: EDID block to scan 1269 * @quirks: quirks to apply 1270 */ 1271static int 1272add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1273 u32 quirks) 1274{ 1275 struct detailed_mode_closure closure = { 1276 connector, 1277 edid, 1278 1, 1279 quirks, 1280 0 1281 }; 1282 1283 if (closure.preferred && !version_greater(edid, 1, 3)) 1284 closure.preferred = 1285 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1286 1287 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1288 1289 return closure.modes; 1290} 1291 1292#define HDMI_IDENTIFIER 0x000C03 1293#define AUDIO_BLOCK 0x01 1294#define VENDOR_BLOCK 0x03 1295#define EDID_BASIC_AUDIO (1 << 6) 1296 1297/** 1298 * Search EDID for CEA extension block. 1299 */ 1300u8 *drm_find_cea_extension(struct edid *edid) 1301{ 1302 u8 *edid_ext = NULL; 1303 int i; 1304 1305 /* No EDID or EDID extensions */ 1306 if (edid == NULL || edid->extensions == 0) 1307 return NULL; 1308 1309 /* Find CEA extension */ 1310 for (i = 0; i < edid->extensions; i++) { 1311 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1312 if (edid_ext[0] == CEA_EXT) 1313 break; 1314 } 1315 1316 if (i == edid->extensions) 1317 return NULL; 1318 1319 return edid_ext; 1320} 1321EXPORT_SYMBOL(drm_find_cea_extension); 1322 1323/** 1324 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1325 * @edid: monitor EDID information 1326 * 1327 * Parse the CEA extension according to CEA-861-B. 1328 * Return true if HDMI, false if not or unknown. 1329 */ 1330bool drm_detect_hdmi_monitor(struct edid *edid) 1331{ 1332 u8 *edid_ext; 1333 int i, hdmi_id; 1334 int start_offset, end_offset; 1335 bool is_hdmi = false; 1336 1337 edid_ext = drm_find_cea_extension(edid); 1338 if (!edid_ext) 1339 goto end; 1340 1341 /* Data block offset in CEA extension block */ 1342 start_offset = 4; 1343 end_offset = edid_ext[2]; 1344 1345 /* 1346 * Because HDMI identifier is in Vendor Specific Block, 1347 * search it from all data blocks of CEA extension. 1348 */ 1349 for (i = start_offset; i < end_offset; 1350 /* Increased by data block len */ 1351 i += ((edid_ext[i] & 0x1f) + 1)) { 1352 /* Find vendor specific block */ 1353 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1354 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1355 edid_ext[i + 3] << 16; 1356 /* Find HDMI identifier */ 1357 if (hdmi_id == HDMI_IDENTIFIER) 1358 is_hdmi = true; 1359 break; 1360 } 1361 } 1362 1363end: 1364 return is_hdmi; 1365} 1366EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1367 1368/** 1369 * drm_detect_monitor_audio - check monitor audio capability 1370 * 1371 * Monitor should have CEA extension block. 1372 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1373 * audio' only. If there is any audio extension block and supported 1374 * audio format, assume at least 'basic audio' support, even if 'basic 1375 * audio' is not defined in EDID. 1376 * 1377 */ 1378bool drm_detect_monitor_audio(struct edid *edid) 1379{ 1380 u8 *edid_ext; 1381 int i, j; 1382 bool has_audio = false; 1383 int start_offset, end_offset; 1384 1385 edid_ext = drm_find_cea_extension(edid); 1386 if (!edid_ext) 1387 goto end; 1388 1389 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1390 1391 if (has_audio) { 1392 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1393 goto end; 1394 } 1395 1396 /* Data block offset in CEA extension block */ 1397 start_offset = 4; 1398 end_offset = edid_ext[2]; 1399 1400 for (i = start_offset; i < end_offset; 1401 i += ((edid_ext[i] & 0x1f) + 1)) { 1402 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1403 has_audio = true; 1404 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1405 DRM_DEBUG_KMS("CEA audio format %d\n", 1406 (edid_ext[i + j] >> 3) & 0xf); 1407 goto end; 1408 } 1409 } 1410end: 1411 return has_audio; 1412} 1413EXPORT_SYMBOL(drm_detect_monitor_audio); 1414 1415/** 1416 * drm_add_display_info - pull display info out if present 1417 * @edid: EDID data 1418 * @info: display info (attached to connector) 1419 * 1420 * Grab any available display info and stuff it into the drm_display_info 1421 * structure that's part of the connector. Useful for tracking bpp and 1422 * color spaces. 1423 */ 1424static void drm_add_display_info(struct edid *edid, 1425 struct drm_display_info *info) 1426{ 1427 info->width_mm = edid->width_cm * 10; 1428 info->height_mm = edid->height_cm * 10; 1429 1430 /* driver figures it out in this case */ 1431 info->bpc = 0; 1432 info->color_formats = 0; 1433 1434 /* Only defined for 1.4 with digital displays */ 1435 if (edid->revision < 4) 1436 return; 1437 1438 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1439 return; 1440 1441 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1442 case DRM_EDID_DIGITAL_DEPTH_6: 1443 info->bpc = 6; 1444 break; 1445 case DRM_EDID_DIGITAL_DEPTH_8: 1446 info->bpc = 8; 1447 break; 1448 case DRM_EDID_DIGITAL_DEPTH_10: 1449 info->bpc = 10; 1450 break; 1451 case DRM_EDID_DIGITAL_DEPTH_12: 1452 info->bpc = 12; 1453 break; 1454 case DRM_EDID_DIGITAL_DEPTH_14: 1455 info->bpc = 14; 1456 break; 1457 case DRM_EDID_DIGITAL_DEPTH_16: 1458 info->bpc = 16; 1459 break; 1460 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1461 default: 1462 info->bpc = 0; 1463 break; 1464 } 1465 1466 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1467 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1468 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1469 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1470 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1471} 1472 1473/** 1474 * drm_add_edid_modes - add modes from EDID data, if available 1475 * @connector: connector we're probing 1476 * @edid: edid data 1477 * 1478 * Add the specified modes to the connector's mode list. 1479 * 1480 * Return number of modes added or 0 if we couldn't find any. 1481 */ 1482int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1483{ 1484 int num_modes = 0; 1485 u32 quirks; 1486 1487 if (edid == NULL) { 1488 return 0; 1489 } 1490 if (!drm_edid_is_valid(edid)) { 1491 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1492 drm_get_connector_name(connector)); 1493 return 0; 1494 } 1495 1496 quirks = edid_get_quirks(edid); 1497 1498 /* 1499 * EDID spec says modes should be preferred in this order: 1500 * - preferred detailed mode 1501 * - other detailed modes from base block 1502 * - detailed modes from extension blocks 1503 * - CVT 3-byte code modes 1504 * - standard timing codes 1505 * - established timing codes 1506 * - modes inferred from GTF or CVT range information 1507 * 1508 * We get this pretty much right. 1509 * 1510 * XXX order for additional mode types in extension blocks? 1511 */ 1512 num_modes += add_detailed_modes(connector, edid, quirks); 1513 num_modes += add_cvt_modes(connector, edid); 1514 num_modes += add_standard_modes(connector, edid); 1515 num_modes += add_established_modes(connector, edid); 1516 num_modes += add_inferred_modes(connector, edid); 1517 1518 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1519 edid_fixup_preferred(connector, quirks); 1520 1521 drm_add_display_info(edid, &connector->display_info); 1522 1523 return num_modes; 1524} 1525EXPORT_SYMBOL(drm_add_edid_modes); 1526 1527/** 1528 * drm_add_modes_noedid - add modes for the connectors without EDID 1529 * @connector: connector we're probing 1530 * @hdisplay: the horizontal display limit 1531 * @vdisplay: the vertical display limit 1532 * 1533 * Add the specified modes to the connector's mode list. Only when the 1534 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1535 * 1536 * Return number of modes added or 0 if we couldn't find any. 1537 */ 1538int drm_add_modes_noedid(struct drm_connector *connector, 1539 int hdisplay, int vdisplay) 1540{ 1541 int i, count, num_modes = 0; 1542 struct drm_display_mode *mode; 1543 struct drm_device *dev = connector->dev; 1544 1545 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1546 if (hdisplay < 0) 1547 hdisplay = 0; 1548 if (vdisplay < 0) 1549 vdisplay = 0; 1550 1551 for (i = 0; i < count; i++) { 1552 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1553 if (hdisplay && vdisplay) { 1554 /* 1555 * Only when two are valid, they will be used to check 1556 * whether the mode should be added to the mode list of 1557 * the connector. 1558 */ 1559 if (ptr->hdisplay > hdisplay || 1560 ptr->vdisplay > vdisplay) 1561 continue; 1562 } 1563 if (drm_mode_vrefresh(ptr) > 61) 1564 continue; 1565 mode = drm_mode_duplicate(dev, ptr); 1566 if (mode) { 1567 drm_mode_probed_add(connector, mode); 1568 num_modes++; 1569 } 1570 } 1571 return num_modes; 1572} 1573EXPORT_SYMBOL(drm_add_modes_noedid); 1574