drm_edid.c revision a0ab734d62ef4c35ffa5e39f9ec1e6d6284f05fa
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 <linux/export.h> 34#include "drmP.h" 35#include "drm_edid.h" 36#include "drm_edid_modes.h" 37 38#define version_greater(edid, maj, min) \ 39 (((edid)->version > (maj)) || \ 40 ((edid)->version == (maj) && (edid)->revision > (min))) 41 42#define EDID_EST_TIMINGS 16 43#define EDID_STD_TIMINGS 8 44#define EDID_DETAILED_TIMINGS 4 45 46/* 47 * EDID blocks out in the wild have a variety of bugs, try to collect 48 * them here (note that userspace may work around broken monitors first, 49 * but fixes should make their way here so that the kernel "just works" 50 * on as many displays as possible). 51 */ 52 53/* First detailed mode wrong, use largest 60Hz mode */ 54#define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 55/* Reported 135MHz pixel clock is too high, needs adjustment */ 56#define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 57/* Prefer the largest mode at 75 Hz */ 58#define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 59/* Detail timing is in cm not mm */ 60#define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 61/* Detailed timing descriptors have bogus size values, so just take the 62 * maximum size and use that. 63 */ 64#define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 65/* Monitor forgot to set the first detailed is preferred bit. */ 66#define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 67/* use +hsync +vsync for detailed mode */ 68#define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 69 70struct detailed_mode_closure { 71 struct drm_connector *connector; 72 struct edid *edid; 73 bool preferred; 74 u32 quirks; 75 int modes; 76}; 77 78#define LEVEL_DMT 0 79#define LEVEL_GTF 1 80#define LEVEL_GTF2 2 81#define LEVEL_CVT 3 82 83static struct edid_quirk { 84 char *vendor; 85 int product_id; 86 u32 quirks; 87} edid_quirk_list[] = { 88 /* Acer AL1706 */ 89 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 90 /* Acer F51 */ 91 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 92 /* Unknown Acer */ 93 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 94 95 /* Belinea 10 15 55 */ 96 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 97 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 98 99 /* Envision Peripherals, Inc. EN-7100e */ 100 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 101 /* Envision EN2028 */ 102 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 103 104 /* Funai Electronics PM36B */ 105 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 106 EDID_QUIRK_DETAILED_IN_CM }, 107 108 /* LG Philips LCD LP154W01-A5 */ 109 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 110 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 111 112 /* Philips 107p5 CRT */ 113 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 114 115 /* Proview AY765C */ 116 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 117 118 /* Samsung SyncMaster 205BW. Note: irony */ 119 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 120 /* Samsung SyncMaster 22[5-6]BW */ 121 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 122 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 123}; 124 125/*** DDC fetch and block validation ***/ 126 127static const u8 edid_header[] = { 128 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 129}; 130 131 /* 132 * Sanity check the header of the base EDID block. Return 8 if the header 133 * is perfect, down to 0 if it's totally wrong. 134 */ 135int drm_edid_header_is_valid(const u8 *raw_edid) 136{ 137 int i, score = 0; 138 139 for (i = 0; i < sizeof(edid_header); i++) 140 if (raw_edid[i] == edid_header[i]) 141 score++; 142 143 return score; 144} 145EXPORT_SYMBOL(drm_edid_header_is_valid); 146 147 148/* 149 * Sanity check the EDID block (base or extension). Return 0 if the block 150 * doesn't check out, or 1 if it's valid. 151 */ 152static bool 153drm_edid_block_valid(u8 *raw_edid) 154{ 155 int i; 156 u8 csum = 0; 157 struct edid *edid = (struct edid *)raw_edid; 158 159 if (raw_edid[0] == 0x00) { 160 int score = drm_edid_header_is_valid(raw_edid); 161 if (score == 8) ; 162 else if (score >= 6) { 163 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 164 memcpy(raw_edid, edid_header, sizeof(edid_header)); 165 } else { 166 goto bad; 167 } 168 } 169 170 for (i = 0; i < EDID_LENGTH; i++) 171 csum += raw_edid[i]; 172 if (csum) { 173 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 174 175 /* allow CEA to slide through, switches mangle this */ 176 if (raw_edid[0] != 0x02) 177 goto bad; 178 } 179 180 /* per-block-type checks */ 181 switch (raw_edid[0]) { 182 case 0: /* base */ 183 if (edid->version != 1) { 184 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 185 goto bad; 186 } 187 188 if (edid->revision > 4) 189 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 190 break; 191 192 default: 193 break; 194 } 195 196 return 1; 197 198bad: 199 if (raw_edid) { 200 printk(KERN_ERR "Raw EDID:\n"); 201 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1, 202 raw_edid, EDID_LENGTH, false); 203 } 204 return 0; 205} 206 207/** 208 * drm_edid_is_valid - sanity check EDID data 209 * @edid: EDID data 210 * 211 * Sanity-check an entire EDID record (including extensions) 212 */ 213bool drm_edid_is_valid(struct edid *edid) 214{ 215 int i; 216 u8 *raw = (u8 *)edid; 217 218 if (!edid) 219 return false; 220 221 for (i = 0; i <= edid->extensions; i++) 222 if (!drm_edid_block_valid(raw + i * EDID_LENGTH)) 223 return false; 224 225 return true; 226} 227EXPORT_SYMBOL(drm_edid_is_valid); 228 229#define DDC_ADDR 0x50 230#define DDC_SEGMENT_ADDR 0x30 231/** 232 * Get EDID information via I2C. 233 * 234 * \param adapter : i2c device adaptor 235 * \param buf : EDID data buffer to be filled 236 * \param len : EDID data buffer length 237 * \return 0 on success or -1 on failure. 238 * 239 * Try to fetch EDID information by calling i2c driver function. 240 */ 241static int 242drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, 243 int block, int len) 244{ 245 unsigned char start = block * EDID_LENGTH; 246 int ret, retries = 5; 247 248 /* The core i2c driver will automatically retry the transfer if the 249 * adapter reports EAGAIN. However, we find that bit-banging transfers 250 * are susceptible to errors under a heavily loaded machine and 251 * generate spurious NAKs and timeouts. Retrying the transfer 252 * of the individual block a few times seems to overcome this. 253 */ 254 do { 255 struct i2c_msg msgs[] = { 256 { 257 .addr = DDC_ADDR, 258 .flags = 0, 259 .len = 1, 260 .buf = &start, 261 }, { 262 .addr = DDC_ADDR, 263 .flags = I2C_M_RD, 264 .len = len, 265 .buf = buf, 266 } 267 }; 268 ret = i2c_transfer(adapter, msgs, 2); 269 } while (ret != 2 && --retries); 270 271 return ret == 2 ? 0 : -1; 272} 273 274static bool drm_edid_is_zero(u8 *in_edid, int length) 275{ 276 int i; 277 u32 *raw_edid = (u32 *)in_edid; 278 279 for (i = 0; i < length / 4; i++) 280 if (*(raw_edid + i) != 0) 281 return false; 282 return true; 283} 284 285static u8 * 286drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 287{ 288 int i, j = 0, valid_extensions = 0; 289 u8 *block, *new; 290 291 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 292 return NULL; 293 294 /* base block fetch */ 295 for (i = 0; i < 4; i++) { 296 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 297 goto out; 298 if (drm_edid_block_valid(block)) 299 break; 300 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 301 connector->null_edid_counter++; 302 goto carp; 303 } 304 } 305 if (i == 4) 306 goto carp; 307 308 /* if there's no extensions, we're done */ 309 if (block[0x7e] == 0) 310 return block; 311 312 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 313 if (!new) 314 goto out; 315 block = new; 316 317 for (j = 1; j <= block[0x7e]; j++) { 318 for (i = 0; i < 4; i++) { 319 if (drm_do_probe_ddc_edid(adapter, 320 block + (valid_extensions + 1) * EDID_LENGTH, 321 j, EDID_LENGTH)) 322 goto out; 323 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 324 valid_extensions++; 325 break; 326 } 327 } 328 if (i == 4) 329 dev_warn(connector->dev->dev, 330 "%s: Ignoring invalid EDID block %d.\n", 331 drm_get_connector_name(connector), j); 332 } 333 334 if (valid_extensions != block[0x7e]) { 335 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 336 block[0x7e] = valid_extensions; 337 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 338 if (!new) 339 goto out; 340 block = new; 341 } 342 343 return block; 344 345carp: 346 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 347 drm_get_connector_name(connector), j); 348 349out: 350 kfree(block); 351 return NULL; 352} 353 354/** 355 * Probe DDC presence. 356 * 357 * \param adapter : i2c device adaptor 358 * \return 1 on success 359 */ 360static bool 361drm_probe_ddc(struct i2c_adapter *adapter) 362{ 363 unsigned char out; 364 365 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 366} 367 368/** 369 * drm_get_edid - get EDID data, if available 370 * @connector: connector we're probing 371 * @adapter: i2c adapter to use for DDC 372 * 373 * Poke the given i2c channel to grab EDID data if possible. If found, 374 * attach it to the connector. 375 * 376 * Return edid data or NULL if we couldn't find any. 377 */ 378struct edid *drm_get_edid(struct drm_connector *connector, 379 struct i2c_adapter *adapter) 380{ 381 struct edid *edid = NULL; 382 383 if (drm_probe_ddc(adapter)) 384 edid = (struct edid *)drm_do_get_edid(connector, adapter); 385 386 connector->display_info.raw_edid = (char *)edid; 387 388 return edid; 389 390} 391EXPORT_SYMBOL(drm_get_edid); 392 393/*** EDID parsing ***/ 394 395/** 396 * edid_vendor - match a string against EDID's obfuscated vendor field 397 * @edid: EDID to match 398 * @vendor: vendor string 399 * 400 * Returns true if @vendor is in @edid, false otherwise 401 */ 402static bool edid_vendor(struct edid *edid, char *vendor) 403{ 404 char edid_vendor[3]; 405 406 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 407 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 408 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 409 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 410 411 return !strncmp(edid_vendor, vendor, 3); 412} 413 414/** 415 * edid_get_quirks - return quirk flags for a given EDID 416 * @edid: EDID to process 417 * 418 * This tells subsequent routines what fixes they need to apply. 419 */ 420static u32 edid_get_quirks(struct edid *edid) 421{ 422 struct edid_quirk *quirk; 423 int i; 424 425 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 426 quirk = &edid_quirk_list[i]; 427 428 if (edid_vendor(edid, quirk->vendor) && 429 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 430 return quirk->quirks; 431 } 432 433 return 0; 434} 435 436#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 437#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 438 439/** 440 * edid_fixup_preferred - set preferred modes based on quirk list 441 * @connector: has mode list to fix up 442 * @quirks: quirks list 443 * 444 * Walk the mode list for @connector, clearing the preferred status 445 * on existing modes and setting it anew for the right mode ala @quirks. 446 */ 447static void edid_fixup_preferred(struct drm_connector *connector, 448 u32 quirks) 449{ 450 struct drm_display_mode *t, *cur_mode, *preferred_mode; 451 int target_refresh = 0; 452 453 if (list_empty(&connector->probed_modes)) 454 return; 455 456 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 457 target_refresh = 60; 458 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 459 target_refresh = 75; 460 461 preferred_mode = list_first_entry(&connector->probed_modes, 462 struct drm_display_mode, head); 463 464 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 465 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 466 467 if (cur_mode == preferred_mode) 468 continue; 469 470 /* Largest mode is preferred */ 471 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 472 preferred_mode = cur_mode; 473 474 /* At a given size, try to get closest to target refresh */ 475 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 476 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 477 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 478 preferred_mode = cur_mode; 479 } 480 } 481 482 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 483} 484 485struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 486 int hsize, int vsize, int fresh) 487{ 488 struct drm_display_mode *mode = NULL; 489 int i; 490 491 for (i = 0; i < drm_num_dmt_modes; i++) { 492 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 493 if (hsize == ptr->hdisplay && 494 vsize == ptr->vdisplay && 495 fresh == drm_mode_vrefresh(ptr)) { 496 /* get the expected default mode */ 497 mode = drm_mode_duplicate(dev, ptr); 498 break; 499 } 500 } 501 return mode; 502} 503EXPORT_SYMBOL(drm_mode_find_dmt); 504 505typedef void detailed_cb(struct detailed_timing *timing, void *closure); 506 507static void 508cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 509{ 510 int i, n = 0; 511 u8 rev = ext[0x01], d = ext[0x02]; 512 u8 *det_base = ext + d; 513 514 switch (rev) { 515 case 0: 516 /* can't happen */ 517 return; 518 case 1: 519 /* have to infer how many blocks we have, check pixel clock */ 520 for (i = 0; i < 6; i++) 521 if (det_base[18*i] || det_base[18*i+1]) 522 n++; 523 break; 524 default: 525 /* explicit count */ 526 n = min(ext[0x03] & 0x0f, 6); 527 break; 528 } 529 530 for (i = 0; i < n; i++) 531 cb((struct detailed_timing *)(det_base + 18 * i), closure); 532} 533 534static void 535vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 536{ 537 unsigned int i, n = min((int)ext[0x02], 6); 538 u8 *det_base = ext + 5; 539 540 if (ext[0x01] != 1) 541 return; /* unknown version */ 542 543 for (i = 0; i < n; i++) 544 cb((struct detailed_timing *)(det_base + 18 * i), closure); 545} 546 547static void 548drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 549{ 550 int i; 551 struct edid *edid = (struct edid *)raw_edid; 552 553 if (edid == NULL) 554 return; 555 556 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 557 cb(&(edid->detailed_timings[i]), closure); 558 559 for (i = 1; i <= raw_edid[0x7e]; i++) { 560 u8 *ext = raw_edid + (i * EDID_LENGTH); 561 switch (*ext) { 562 case CEA_EXT: 563 cea_for_each_detailed_block(ext, cb, closure); 564 break; 565 case VTB_EXT: 566 vtb_for_each_detailed_block(ext, cb, closure); 567 break; 568 default: 569 break; 570 } 571 } 572} 573 574static void 575is_rb(struct detailed_timing *t, void *data) 576{ 577 u8 *r = (u8 *)t; 578 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 579 if (r[15] & 0x10) 580 *(bool *)data = true; 581} 582 583/* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 584static bool 585drm_monitor_supports_rb(struct edid *edid) 586{ 587 if (edid->revision >= 4) { 588 bool ret; 589 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 590 return ret; 591 } 592 593 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 594} 595 596static void 597find_gtf2(struct detailed_timing *t, void *data) 598{ 599 u8 *r = (u8 *)t; 600 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 601 *(u8 **)data = r; 602} 603 604/* Secondary GTF curve kicks in above some break frequency */ 605static int 606drm_gtf2_hbreak(struct edid *edid) 607{ 608 u8 *r = NULL; 609 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 610 return r ? (r[12] * 2) : 0; 611} 612 613static int 614drm_gtf2_2c(struct edid *edid) 615{ 616 u8 *r = NULL; 617 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 618 return r ? r[13] : 0; 619} 620 621static int 622drm_gtf2_m(struct edid *edid) 623{ 624 u8 *r = NULL; 625 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 626 return r ? (r[15] << 8) + r[14] : 0; 627} 628 629static int 630drm_gtf2_k(struct edid *edid) 631{ 632 u8 *r = NULL; 633 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 634 return r ? r[16] : 0; 635} 636 637static int 638drm_gtf2_2j(struct edid *edid) 639{ 640 u8 *r = NULL; 641 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 642 return r ? r[17] : 0; 643} 644 645/** 646 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 647 * @edid: EDID block to scan 648 */ 649static int standard_timing_level(struct edid *edid) 650{ 651 if (edid->revision >= 2) { 652 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 653 return LEVEL_CVT; 654 if (drm_gtf2_hbreak(edid)) 655 return LEVEL_GTF2; 656 return LEVEL_GTF; 657 } 658 return LEVEL_DMT; 659} 660 661/* 662 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 663 * monitors fill with ascii space (0x20) instead. 664 */ 665static int 666bad_std_timing(u8 a, u8 b) 667{ 668 return (a == 0x00 && b == 0x00) || 669 (a == 0x01 && b == 0x01) || 670 (a == 0x20 && b == 0x20); 671} 672 673/** 674 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 675 * @t: standard timing params 676 * @timing_level: standard timing level 677 * 678 * Take the standard timing params (in this case width, aspect, and refresh) 679 * and convert them into a real mode using CVT/GTF/DMT. 680 */ 681static struct drm_display_mode * 682drm_mode_std(struct drm_connector *connector, struct edid *edid, 683 struct std_timing *t, int revision) 684{ 685 struct drm_device *dev = connector->dev; 686 struct drm_display_mode *m, *mode = NULL; 687 int hsize, vsize; 688 int vrefresh_rate; 689 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 690 >> EDID_TIMING_ASPECT_SHIFT; 691 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 692 >> EDID_TIMING_VFREQ_SHIFT; 693 int timing_level = standard_timing_level(edid); 694 695 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 696 return NULL; 697 698 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 699 hsize = t->hsize * 8 + 248; 700 /* vrefresh_rate = vfreq + 60 */ 701 vrefresh_rate = vfreq + 60; 702 /* the vdisplay is calculated based on the aspect ratio */ 703 if (aspect_ratio == 0) { 704 if (revision < 3) 705 vsize = hsize; 706 else 707 vsize = (hsize * 10) / 16; 708 } else if (aspect_ratio == 1) 709 vsize = (hsize * 3) / 4; 710 else if (aspect_ratio == 2) 711 vsize = (hsize * 4) / 5; 712 else 713 vsize = (hsize * 9) / 16; 714 715 /* HDTV hack, part 1 */ 716 if (vrefresh_rate == 60 && 717 ((hsize == 1360 && vsize == 765) || 718 (hsize == 1368 && vsize == 769))) { 719 hsize = 1366; 720 vsize = 768; 721 } 722 723 /* 724 * If this connector already has a mode for this size and refresh 725 * rate (because it came from detailed or CVT info), use that 726 * instead. This way we don't have to guess at interlace or 727 * reduced blanking. 728 */ 729 list_for_each_entry(m, &connector->probed_modes, head) 730 if (m->hdisplay == hsize && m->vdisplay == vsize && 731 drm_mode_vrefresh(m) == vrefresh_rate) 732 return NULL; 733 734 /* HDTV hack, part 2 */ 735 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 736 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 737 false); 738 mode->hdisplay = 1366; 739 mode->hsync_start = mode->hsync_start - 1; 740 mode->hsync_end = mode->hsync_end - 1; 741 return mode; 742 } 743 744 /* check whether it can be found in default mode table */ 745 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 746 if (mode) 747 return mode; 748 749 switch (timing_level) { 750 case LEVEL_DMT: 751 break; 752 case LEVEL_GTF: 753 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 754 break; 755 case LEVEL_GTF2: 756 /* 757 * This is potentially wrong if there's ever a monitor with 758 * more than one ranges section, each claiming a different 759 * secondary GTF curve. Please don't do that. 760 */ 761 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 762 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 763 kfree(mode); 764 mode = drm_gtf_mode_complex(dev, hsize, vsize, 765 vrefresh_rate, 0, 0, 766 drm_gtf2_m(edid), 767 drm_gtf2_2c(edid), 768 drm_gtf2_k(edid), 769 drm_gtf2_2j(edid)); 770 } 771 break; 772 case LEVEL_CVT: 773 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 774 false); 775 break; 776 } 777 return mode; 778} 779 780/* 781 * EDID is delightfully ambiguous about how interlaced modes are to be 782 * encoded. Our internal representation is of frame height, but some 783 * HDTV detailed timings are encoded as field height. 784 * 785 * The format list here is from CEA, in frame size. Technically we 786 * should be checking refresh rate too. Whatever. 787 */ 788static void 789drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 790 struct detailed_pixel_timing *pt) 791{ 792 int i; 793 static const struct { 794 int w, h; 795 } cea_interlaced[] = { 796 { 1920, 1080 }, 797 { 720, 480 }, 798 { 1440, 480 }, 799 { 2880, 480 }, 800 { 720, 576 }, 801 { 1440, 576 }, 802 { 2880, 576 }, 803 }; 804 805 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 806 return; 807 808 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 809 if ((mode->hdisplay == cea_interlaced[i].w) && 810 (mode->vdisplay == cea_interlaced[i].h / 2)) { 811 mode->vdisplay *= 2; 812 mode->vsync_start *= 2; 813 mode->vsync_end *= 2; 814 mode->vtotal *= 2; 815 mode->vtotal |= 1; 816 } 817 } 818 819 mode->flags |= DRM_MODE_FLAG_INTERLACE; 820} 821 822/** 823 * drm_mode_detailed - create a new mode from an EDID detailed timing section 824 * @dev: DRM device (needed to create new mode) 825 * @edid: EDID block 826 * @timing: EDID detailed timing info 827 * @quirks: quirks to apply 828 * 829 * An EDID detailed timing block contains enough info for us to create and 830 * return a new struct drm_display_mode. 831 */ 832static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 833 struct edid *edid, 834 struct detailed_timing *timing, 835 u32 quirks) 836{ 837 struct drm_display_mode *mode; 838 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 839 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 840 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 841 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 842 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 843 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 844 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 845 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 846 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 847 848 /* ignore tiny modes */ 849 if (hactive < 64 || vactive < 64) 850 return NULL; 851 852 if (pt->misc & DRM_EDID_PT_STEREO) { 853 printk(KERN_WARNING "stereo mode not supported\n"); 854 return NULL; 855 } 856 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 857 printk(KERN_WARNING "composite sync not supported\n"); 858 } 859 860 /* it is incorrect if hsync/vsync width is zero */ 861 if (!hsync_pulse_width || !vsync_pulse_width) { 862 DRM_DEBUG_KMS("Incorrect Detailed timing. " 863 "Wrong Hsync/Vsync pulse width\n"); 864 return NULL; 865 } 866 mode = drm_mode_create(dev); 867 if (!mode) 868 return NULL; 869 870 mode->type = DRM_MODE_TYPE_DRIVER; 871 872 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 873 timing->pixel_clock = cpu_to_le16(1088); 874 875 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 876 877 mode->hdisplay = hactive; 878 mode->hsync_start = mode->hdisplay + hsync_offset; 879 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 880 mode->htotal = mode->hdisplay + hblank; 881 882 mode->vdisplay = vactive; 883 mode->vsync_start = mode->vdisplay + vsync_offset; 884 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 885 mode->vtotal = mode->vdisplay + vblank; 886 887 /* Some EDIDs have bogus h/vtotal values */ 888 if (mode->hsync_end > mode->htotal) 889 mode->htotal = mode->hsync_end + 1; 890 if (mode->vsync_end > mode->vtotal) 891 mode->vtotal = mode->vsync_end + 1; 892 893 drm_mode_do_interlace_quirk(mode, pt); 894 895 drm_mode_set_name(mode); 896 897 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 898 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 899 } 900 901 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 902 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 903 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 904 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 905 906 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 907 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 908 909 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 910 mode->width_mm *= 10; 911 mode->height_mm *= 10; 912 } 913 914 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 915 mode->width_mm = edid->width_cm * 10; 916 mode->height_mm = edid->height_cm * 10; 917 } 918 919 return mode; 920} 921 922static bool 923mode_is_rb(const struct drm_display_mode *mode) 924{ 925 return (mode->htotal - mode->hdisplay == 160) && 926 (mode->hsync_end - mode->hdisplay == 80) && 927 (mode->hsync_end - mode->hsync_start == 32) && 928 (mode->vsync_start - mode->vdisplay == 3); 929} 930 931static bool 932mode_in_hsync_range(const struct drm_display_mode *mode, 933 struct edid *edid, u8 *t) 934{ 935 int hsync, hmin, hmax; 936 937 hmin = t[7]; 938 if (edid->revision >= 4) 939 hmin += ((t[4] & 0x04) ? 255 : 0); 940 hmax = t[8]; 941 if (edid->revision >= 4) 942 hmax += ((t[4] & 0x08) ? 255 : 0); 943 hsync = drm_mode_hsync(mode); 944 945 return (hsync <= hmax && hsync >= hmin); 946} 947 948static bool 949mode_in_vsync_range(const struct drm_display_mode *mode, 950 struct edid *edid, u8 *t) 951{ 952 int vsync, vmin, vmax; 953 954 vmin = t[5]; 955 if (edid->revision >= 4) 956 vmin += ((t[4] & 0x01) ? 255 : 0); 957 vmax = t[6]; 958 if (edid->revision >= 4) 959 vmax += ((t[4] & 0x02) ? 255 : 0); 960 vsync = drm_mode_vrefresh(mode); 961 962 return (vsync <= vmax && vsync >= vmin); 963} 964 965static u32 966range_pixel_clock(struct edid *edid, u8 *t) 967{ 968 /* unspecified */ 969 if (t[9] == 0 || t[9] == 255) 970 return 0; 971 972 /* 1.4 with CVT support gives us real precision, yay */ 973 if (edid->revision >= 4 && t[10] == 0x04) 974 return (t[9] * 10000) - ((t[12] >> 2) * 250); 975 976 /* 1.3 is pathetic, so fuzz up a bit */ 977 return t[9] * 10000 + 5001; 978} 979 980static bool 981mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 982 struct detailed_timing *timing) 983{ 984 u32 max_clock; 985 u8 *t = (u8 *)timing; 986 987 if (!mode_in_hsync_range(mode, edid, t)) 988 return false; 989 990 if (!mode_in_vsync_range(mode, edid, t)) 991 return false; 992 993 if ((max_clock = range_pixel_clock(edid, t))) 994 if (mode->clock > max_clock) 995 return false; 996 997 /* 1.4 max horizontal check */ 998 if (edid->revision >= 4 && t[10] == 0x04) 999 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1000 return false; 1001 1002 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1003 return false; 1004 1005 return true; 1006} 1007 1008/* 1009 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 1010 * need to account for them. 1011 */ 1012static int 1013drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1014 struct detailed_timing *timing) 1015{ 1016 int i, modes = 0; 1017 struct drm_display_mode *newmode; 1018 struct drm_device *dev = connector->dev; 1019 1020 for (i = 0; i < drm_num_dmt_modes; i++) { 1021 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1022 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1023 if (newmode) { 1024 drm_mode_probed_add(connector, newmode); 1025 modes++; 1026 } 1027 } 1028 } 1029 1030 return modes; 1031} 1032 1033static void 1034do_inferred_modes(struct detailed_timing *timing, void *c) 1035{ 1036 struct detailed_mode_closure *closure = c; 1037 struct detailed_non_pixel *data = &timing->data.other_data; 1038 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1039 1040 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1041 closure->modes += drm_gtf_modes_for_range(closure->connector, 1042 closure->edid, 1043 timing); 1044} 1045 1046static int 1047add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1048{ 1049 struct detailed_mode_closure closure = { 1050 connector, edid, 0, 0, 0 1051 }; 1052 1053 if (version_greater(edid, 1, 0)) 1054 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1055 &closure); 1056 1057 return closure.modes; 1058} 1059 1060static int 1061drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1062{ 1063 int i, j, m, modes = 0; 1064 struct drm_display_mode *mode; 1065 u8 *est = ((u8 *)timing) + 5; 1066 1067 for (i = 0; i < 6; i++) { 1068 for (j = 7; j > 0; j--) { 1069 m = (i * 8) + (7 - j); 1070 if (m >= ARRAY_SIZE(est3_modes)) 1071 break; 1072 if (est[i] & (1 << j)) { 1073 mode = drm_mode_find_dmt(connector->dev, 1074 est3_modes[m].w, 1075 est3_modes[m].h, 1076 est3_modes[m].r 1077 /*, est3_modes[m].rb */); 1078 if (mode) { 1079 drm_mode_probed_add(connector, mode); 1080 modes++; 1081 } 1082 } 1083 } 1084 } 1085 1086 return modes; 1087} 1088 1089static void 1090do_established_modes(struct detailed_timing *timing, void *c) 1091{ 1092 struct detailed_mode_closure *closure = c; 1093 struct detailed_non_pixel *data = &timing->data.other_data; 1094 1095 if (data->type == EDID_DETAIL_EST_TIMINGS) 1096 closure->modes += drm_est3_modes(closure->connector, timing); 1097} 1098 1099/** 1100 * add_established_modes - get est. modes from EDID and add them 1101 * @edid: EDID block to scan 1102 * 1103 * Each EDID block contains a bitmap of the supported "established modes" list 1104 * (defined above). Tease them out and add them to the global modes list. 1105 */ 1106static int 1107add_established_modes(struct drm_connector *connector, struct edid *edid) 1108{ 1109 struct drm_device *dev = connector->dev; 1110 unsigned long est_bits = edid->established_timings.t1 | 1111 (edid->established_timings.t2 << 8) | 1112 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1113 int i, modes = 0; 1114 struct detailed_mode_closure closure = { 1115 connector, edid, 0, 0, 0 1116 }; 1117 1118 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1119 if (est_bits & (1<<i)) { 1120 struct drm_display_mode *newmode; 1121 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1122 if (newmode) { 1123 drm_mode_probed_add(connector, newmode); 1124 modes++; 1125 } 1126 } 1127 } 1128 1129 if (version_greater(edid, 1, 0)) 1130 drm_for_each_detailed_block((u8 *)edid, 1131 do_established_modes, &closure); 1132 1133 return modes + closure.modes; 1134} 1135 1136static void 1137do_standard_modes(struct detailed_timing *timing, void *c) 1138{ 1139 struct detailed_mode_closure *closure = c; 1140 struct detailed_non_pixel *data = &timing->data.other_data; 1141 struct drm_connector *connector = closure->connector; 1142 struct edid *edid = closure->edid; 1143 1144 if (data->type == EDID_DETAIL_STD_MODES) { 1145 int i; 1146 for (i = 0; i < 6; i++) { 1147 struct std_timing *std; 1148 struct drm_display_mode *newmode; 1149 1150 std = &data->data.timings[i]; 1151 newmode = drm_mode_std(connector, edid, std, 1152 edid->revision); 1153 if (newmode) { 1154 drm_mode_probed_add(connector, newmode); 1155 closure->modes++; 1156 } 1157 } 1158 } 1159} 1160 1161/** 1162 * add_standard_modes - get std. modes from EDID and add them 1163 * @edid: EDID block to scan 1164 * 1165 * Standard modes can be calculated using the appropriate standard (DMT, 1166 * GTF or CVT. Grab them from @edid and add them to the list. 1167 */ 1168static int 1169add_standard_modes(struct drm_connector *connector, struct edid *edid) 1170{ 1171 int i, modes = 0; 1172 struct detailed_mode_closure closure = { 1173 connector, edid, 0, 0, 0 1174 }; 1175 1176 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1177 struct drm_display_mode *newmode; 1178 1179 newmode = drm_mode_std(connector, edid, 1180 &edid->standard_timings[i], 1181 edid->revision); 1182 if (newmode) { 1183 drm_mode_probed_add(connector, newmode); 1184 modes++; 1185 } 1186 } 1187 1188 if (version_greater(edid, 1, 0)) 1189 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1190 &closure); 1191 1192 /* XXX should also look for standard codes in VTB blocks */ 1193 1194 return modes + closure.modes; 1195} 1196 1197static int drm_cvt_modes(struct drm_connector *connector, 1198 struct detailed_timing *timing) 1199{ 1200 int i, j, modes = 0; 1201 struct drm_display_mode *newmode; 1202 struct drm_device *dev = connector->dev; 1203 struct cvt_timing *cvt; 1204 const int rates[] = { 60, 85, 75, 60, 50 }; 1205 const u8 empty[3] = { 0, 0, 0 }; 1206 1207 for (i = 0; i < 4; i++) { 1208 int uninitialized_var(width), height; 1209 cvt = &(timing->data.other_data.data.cvt[i]); 1210 1211 if (!memcmp(cvt->code, empty, 3)) 1212 continue; 1213 1214 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1215 switch (cvt->code[1] & 0x0c) { 1216 case 0x00: 1217 width = height * 4 / 3; 1218 break; 1219 case 0x04: 1220 width = height * 16 / 9; 1221 break; 1222 case 0x08: 1223 width = height * 16 / 10; 1224 break; 1225 case 0x0c: 1226 width = height * 15 / 9; 1227 break; 1228 } 1229 1230 for (j = 1; j < 5; j++) { 1231 if (cvt->code[2] & (1 << j)) { 1232 newmode = drm_cvt_mode(dev, width, height, 1233 rates[j], j == 0, 1234 false, false); 1235 if (newmode) { 1236 drm_mode_probed_add(connector, newmode); 1237 modes++; 1238 } 1239 } 1240 } 1241 } 1242 1243 return modes; 1244} 1245 1246static void 1247do_cvt_mode(struct detailed_timing *timing, void *c) 1248{ 1249 struct detailed_mode_closure *closure = c; 1250 struct detailed_non_pixel *data = &timing->data.other_data; 1251 1252 if (data->type == EDID_DETAIL_CVT_3BYTE) 1253 closure->modes += drm_cvt_modes(closure->connector, timing); 1254} 1255 1256static int 1257add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1258{ 1259 struct detailed_mode_closure closure = { 1260 connector, edid, 0, 0, 0 1261 }; 1262 1263 if (version_greater(edid, 1, 2)) 1264 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1265 1266 /* XXX should also look for CVT codes in VTB blocks */ 1267 1268 return closure.modes; 1269} 1270 1271static void 1272do_detailed_mode(struct detailed_timing *timing, void *c) 1273{ 1274 struct detailed_mode_closure *closure = c; 1275 struct drm_display_mode *newmode; 1276 1277 if (timing->pixel_clock) { 1278 newmode = drm_mode_detailed(closure->connector->dev, 1279 closure->edid, timing, 1280 closure->quirks); 1281 if (!newmode) 1282 return; 1283 1284 if (closure->preferred) 1285 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1286 1287 drm_mode_probed_add(closure->connector, newmode); 1288 closure->modes++; 1289 closure->preferred = 0; 1290 } 1291} 1292 1293/* 1294 * add_detailed_modes - Add modes from detailed timings 1295 * @connector: attached connector 1296 * @edid: EDID block to scan 1297 * @quirks: quirks to apply 1298 */ 1299static int 1300add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1301 u32 quirks) 1302{ 1303 struct detailed_mode_closure closure = { 1304 connector, 1305 edid, 1306 1, 1307 quirks, 1308 0 1309 }; 1310 1311 if (closure.preferred && !version_greater(edid, 1, 3)) 1312 closure.preferred = 1313 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1314 1315 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1316 1317 return closure.modes; 1318} 1319 1320#define HDMI_IDENTIFIER 0x000C03 1321#define AUDIO_BLOCK 0x01 1322#define VIDEO_BLOCK 0x02 1323#define VENDOR_BLOCK 0x03 1324#define SPEAKER_BLOCK 0x04 1325#define EDID_BASIC_AUDIO (1 << 6) 1326 1327/** 1328 * Search EDID for CEA extension block. 1329 */ 1330u8 *drm_find_cea_extension(struct edid *edid) 1331{ 1332 u8 *edid_ext = NULL; 1333 int i; 1334 1335 /* No EDID or EDID extensions */ 1336 if (edid == NULL || edid->extensions == 0) 1337 return NULL; 1338 1339 /* Find CEA extension */ 1340 for (i = 0; i < edid->extensions; i++) { 1341 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1342 if (edid_ext[0] == CEA_EXT) 1343 break; 1344 } 1345 1346 if (i == edid->extensions) 1347 return NULL; 1348 1349 return edid_ext; 1350} 1351EXPORT_SYMBOL(drm_find_cea_extension); 1352 1353static int 1354do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1355{ 1356 struct drm_device *dev = connector->dev; 1357 u8 * mode, cea_mode; 1358 int modes = 0; 1359 1360 for (mode = db; mode < db + len; mode++) { 1361 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1362 if (cea_mode < drm_num_cea_modes) { 1363 struct drm_display_mode *newmode; 1364 newmode = drm_mode_duplicate(dev, 1365 &edid_cea_modes[cea_mode]); 1366 if (newmode) { 1367 drm_mode_probed_add(connector, newmode); 1368 modes++; 1369 } 1370 } 1371 } 1372 1373 return modes; 1374} 1375 1376static int 1377add_cea_modes(struct drm_connector *connector, struct edid *edid) 1378{ 1379 u8 * cea = drm_find_cea_extension(edid); 1380 u8 * db, dbl; 1381 int modes = 0; 1382 1383 if (cea && cea[1] >= 3) { 1384 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1385 dbl = db[0] & 0x1f; 1386 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK) 1387 modes += do_cea_modes (connector, db+1, dbl); 1388 } 1389 } 1390 1391 return modes; 1392} 1393 1394static void 1395parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1396{ 1397 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1398 1399 connector->dvi_dual = db[6] & 1; 1400 connector->max_tmds_clock = db[7] * 5; 1401 1402 connector->latency_present[0] = db[8] >> 7; 1403 connector->latency_present[1] = (db[8] >> 6) & 1; 1404 connector->video_latency[0] = db[9]; 1405 connector->audio_latency[0] = db[10]; 1406 connector->video_latency[1] = db[11]; 1407 connector->audio_latency[1] = db[12]; 1408 1409 DRM_LOG_KMS("HDMI: DVI dual %d, " 1410 "max TMDS clock %d, " 1411 "latency present %d %d, " 1412 "video latency %d %d, " 1413 "audio latency %d %d\n", 1414 connector->dvi_dual, 1415 connector->max_tmds_clock, 1416 (int) connector->latency_present[0], 1417 (int) connector->latency_present[1], 1418 connector->video_latency[0], 1419 connector->video_latency[1], 1420 connector->audio_latency[0], 1421 connector->audio_latency[1]); 1422} 1423 1424static void 1425monitor_name(struct detailed_timing *t, void *data) 1426{ 1427 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1428 *(u8 **)data = t->data.other_data.data.str.str; 1429} 1430 1431/** 1432 * drm_edid_to_eld - build ELD from EDID 1433 * @connector: connector corresponding to the HDMI/DP sink 1434 * @edid: EDID to parse 1435 * 1436 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1437 * Some ELD fields are left to the graphics driver caller: 1438 * - Conn_Type 1439 * - HDCP 1440 * - Port_ID 1441 */ 1442void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1443{ 1444 uint8_t *eld = connector->eld; 1445 u8 *cea; 1446 u8 *name; 1447 u8 *db; 1448 int sad_count = 0; 1449 int mnl; 1450 int dbl; 1451 1452 memset(eld, 0, sizeof(connector->eld)); 1453 1454 cea = drm_find_cea_extension(edid); 1455 if (!cea) { 1456 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1457 return; 1458 } 1459 1460 name = NULL; 1461 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1462 for (mnl = 0; name && mnl < 13; mnl++) { 1463 if (name[mnl] == 0x0a) 1464 break; 1465 eld[20 + mnl] = name[mnl]; 1466 } 1467 eld[4] = (cea[1] << 5) | mnl; 1468 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1469 1470 eld[0] = 2 << 3; /* ELD version: 2 */ 1471 1472 eld[16] = edid->mfg_id[0]; 1473 eld[17] = edid->mfg_id[1]; 1474 eld[18] = edid->prod_code[0]; 1475 eld[19] = edid->prod_code[1]; 1476 1477 if (cea[1] >= 3) 1478 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1479 dbl = db[0] & 0x1f; 1480 1481 switch ((db[0] & 0xe0) >> 5) { 1482 case AUDIO_BLOCK: 1483 /* Audio Data Block, contains SADs */ 1484 sad_count = dbl / 3; 1485 memcpy(eld + 20 + mnl, &db[1], dbl); 1486 break; 1487 case SPEAKER_BLOCK: 1488 /* Speaker Allocation Data Block */ 1489 eld[7] = db[1]; 1490 break; 1491 case VENDOR_BLOCK: 1492 /* HDMI Vendor-Specific Data Block */ 1493 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1494 parse_hdmi_vsdb(connector, db); 1495 break; 1496 default: 1497 break; 1498 } 1499 } 1500 eld[5] |= sad_count << 4; 1501 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1502 1503 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1504} 1505EXPORT_SYMBOL(drm_edid_to_eld); 1506 1507/** 1508 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1509 * @connector: connector associated with the HDMI/DP sink 1510 * @mode: the display mode 1511 */ 1512int drm_av_sync_delay(struct drm_connector *connector, 1513 struct drm_display_mode *mode) 1514{ 1515 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1516 int a, v; 1517 1518 if (!connector->latency_present[0]) 1519 return 0; 1520 if (!connector->latency_present[1]) 1521 i = 0; 1522 1523 a = connector->audio_latency[i]; 1524 v = connector->video_latency[i]; 1525 1526 /* 1527 * HDMI/DP sink doesn't support audio or video? 1528 */ 1529 if (a == 255 || v == 255) 1530 return 0; 1531 1532 /* 1533 * Convert raw EDID values to millisecond. 1534 * Treat unknown latency as 0ms. 1535 */ 1536 if (a) 1537 a = min(2 * (a - 1), 500); 1538 if (v) 1539 v = min(2 * (v - 1), 500); 1540 1541 return max(v - a, 0); 1542} 1543EXPORT_SYMBOL(drm_av_sync_delay); 1544 1545/** 1546 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1547 * @encoder: the encoder just changed display mode 1548 * @mode: the adjusted display mode 1549 * 1550 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1551 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1552 */ 1553struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1554 struct drm_display_mode *mode) 1555{ 1556 struct drm_connector *connector; 1557 struct drm_device *dev = encoder->dev; 1558 1559 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1560 if (connector->encoder == encoder && connector->eld[0]) 1561 return connector; 1562 1563 return NULL; 1564} 1565EXPORT_SYMBOL(drm_select_eld); 1566 1567/** 1568 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1569 * @edid: monitor EDID information 1570 * 1571 * Parse the CEA extension according to CEA-861-B. 1572 * Return true if HDMI, false if not or unknown. 1573 */ 1574bool drm_detect_hdmi_monitor(struct edid *edid) 1575{ 1576 u8 *edid_ext; 1577 int i, hdmi_id; 1578 int start_offset, end_offset; 1579 bool is_hdmi = false; 1580 1581 edid_ext = drm_find_cea_extension(edid); 1582 if (!edid_ext) 1583 goto end; 1584 1585 /* Data block offset in CEA extension block */ 1586 start_offset = 4; 1587 end_offset = edid_ext[2]; 1588 1589 /* 1590 * Because HDMI identifier is in Vendor Specific Block, 1591 * search it from all data blocks of CEA extension. 1592 */ 1593 for (i = start_offset; i < end_offset; 1594 /* Increased by data block len */ 1595 i += ((edid_ext[i] & 0x1f) + 1)) { 1596 /* Find vendor specific block */ 1597 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1598 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1599 edid_ext[i + 3] << 16; 1600 /* Find HDMI identifier */ 1601 if (hdmi_id == HDMI_IDENTIFIER) 1602 is_hdmi = true; 1603 break; 1604 } 1605 } 1606 1607end: 1608 return is_hdmi; 1609} 1610EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1611 1612/** 1613 * drm_detect_monitor_audio - check monitor audio capability 1614 * 1615 * Monitor should have CEA extension block. 1616 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1617 * audio' only. If there is any audio extension block and supported 1618 * audio format, assume at least 'basic audio' support, even if 'basic 1619 * audio' is not defined in EDID. 1620 * 1621 */ 1622bool drm_detect_monitor_audio(struct edid *edid) 1623{ 1624 u8 *edid_ext; 1625 int i, j; 1626 bool has_audio = false; 1627 int start_offset, end_offset; 1628 1629 edid_ext = drm_find_cea_extension(edid); 1630 if (!edid_ext) 1631 goto end; 1632 1633 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1634 1635 if (has_audio) { 1636 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1637 goto end; 1638 } 1639 1640 /* Data block offset in CEA extension block */ 1641 start_offset = 4; 1642 end_offset = edid_ext[2]; 1643 1644 for (i = start_offset; i < end_offset; 1645 i += ((edid_ext[i] & 0x1f) + 1)) { 1646 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1647 has_audio = true; 1648 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1649 DRM_DEBUG_KMS("CEA audio format %d\n", 1650 (edid_ext[i + j] >> 3) & 0xf); 1651 goto end; 1652 } 1653 } 1654end: 1655 return has_audio; 1656} 1657EXPORT_SYMBOL(drm_detect_monitor_audio); 1658 1659/** 1660 * drm_add_display_info - pull display info out if present 1661 * @edid: EDID data 1662 * @info: display info (attached to connector) 1663 * 1664 * Grab any available display info and stuff it into the drm_display_info 1665 * structure that's part of the connector. Useful for tracking bpp and 1666 * color spaces. 1667 */ 1668static void drm_add_display_info(struct edid *edid, 1669 struct drm_display_info *info) 1670{ 1671 u8 *edid_ext; 1672 1673 info->width_mm = edid->width_cm * 10; 1674 info->height_mm = edid->height_cm * 10; 1675 1676 /* driver figures it out in this case */ 1677 info->bpc = 0; 1678 info->color_formats = 0; 1679 1680 /* Only defined for 1.4 with digital displays */ 1681 if (edid->revision < 4) 1682 return; 1683 1684 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1685 return; 1686 1687 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1688 case DRM_EDID_DIGITAL_DEPTH_6: 1689 info->bpc = 6; 1690 break; 1691 case DRM_EDID_DIGITAL_DEPTH_8: 1692 info->bpc = 8; 1693 break; 1694 case DRM_EDID_DIGITAL_DEPTH_10: 1695 info->bpc = 10; 1696 break; 1697 case DRM_EDID_DIGITAL_DEPTH_12: 1698 info->bpc = 12; 1699 break; 1700 case DRM_EDID_DIGITAL_DEPTH_14: 1701 info->bpc = 14; 1702 break; 1703 case DRM_EDID_DIGITAL_DEPTH_16: 1704 info->bpc = 16; 1705 break; 1706 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1707 default: 1708 info->bpc = 0; 1709 break; 1710 } 1711 1712 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1713 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1714 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1715 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1716 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1717 1718 /* Get data from CEA blocks if present */ 1719 edid_ext = drm_find_cea_extension(edid); 1720 if (!edid_ext) 1721 return; 1722 1723 info->cea_rev = edid_ext[1]; 1724} 1725 1726/** 1727 * drm_add_edid_modes - add modes from EDID data, if available 1728 * @connector: connector we're probing 1729 * @edid: edid data 1730 * 1731 * Add the specified modes to the connector's mode list. 1732 * 1733 * Return number of modes added or 0 if we couldn't find any. 1734 */ 1735int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1736{ 1737 int num_modes = 0; 1738 u32 quirks; 1739 1740 if (edid == NULL) { 1741 return 0; 1742 } 1743 if (!drm_edid_is_valid(edid)) { 1744 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1745 drm_get_connector_name(connector)); 1746 return 0; 1747 } 1748 1749 quirks = edid_get_quirks(edid); 1750 1751 /* 1752 * EDID spec says modes should be preferred in this order: 1753 * - preferred detailed mode 1754 * - other detailed modes from base block 1755 * - detailed modes from extension blocks 1756 * - CVT 3-byte code modes 1757 * - standard timing codes 1758 * - established timing codes 1759 * - modes inferred from GTF or CVT range information 1760 * 1761 * We get this pretty much right. 1762 * 1763 * XXX order for additional mode types in extension blocks? 1764 */ 1765 num_modes += add_detailed_modes(connector, edid, quirks); 1766 num_modes += add_cvt_modes(connector, edid); 1767 num_modes += add_standard_modes(connector, edid); 1768 num_modes += add_established_modes(connector, edid); 1769 num_modes += add_inferred_modes(connector, edid); 1770 num_modes += add_cea_modes(connector, edid); 1771 1772 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1773 edid_fixup_preferred(connector, quirks); 1774 1775 drm_add_display_info(edid, &connector->display_info); 1776 1777 return num_modes; 1778} 1779EXPORT_SYMBOL(drm_add_edid_modes); 1780 1781/** 1782 * drm_add_modes_noedid - add modes for the connectors without EDID 1783 * @connector: connector we're probing 1784 * @hdisplay: the horizontal display limit 1785 * @vdisplay: the vertical display limit 1786 * 1787 * Add the specified modes to the connector's mode list. Only when the 1788 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1789 * 1790 * Return number of modes added or 0 if we couldn't find any. 1791 */ 1792int drm_add_modes_noedid(struct drm_connector *connector, 1793 int hdisplay, int vdisplay) 1794{ 1795 int i, count, num_modes = 0; 1796 struct drm_display_mode *mode; 1797 struct drm_device *dev = connector->dev; 1798 1799 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1800 if (hdisplay < 0) 1801 hdisplay = 0; 1802 if (vdisplay < 0) 1803 vdisplay = 0; 1804 1805 for (i = 0; i < count; i++) { 1806 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1807 if (hdisplay && vdisplay) { 1808 /* 1809 * Only when two are valid, they will be used to check 1810 * whether the mode should be added to the mode list of 1811 * the connector. 1812 */ 1813 if (ptr->hdisplay > hdisplay || 1814 ptr->vdisplay > vdisplay) 1815 continue; 1816 } 1817 if (drm_mode_vrefresh(ptr) > 61) 1818 continue; 1819 mode = drm_mode_duplicate(dev, ptr); 1820 if (mode) { 1821 drm_mode_probed_add(connector, mode); 1822 num_modes++; 1823 } 1824 } 1825 return num_modes; 1826} 1827EXPORT_SYMBOL(drm_add_modes_noedid); 1828