1 /* 2 * Copyright (c) 2006 Luc Verhaegen (quirks list) 3 * Copyright (c) 2007-2008 Intel Corporation 4 * Jesse Barnes <jesse.barnes@intel.com> 5 * Copyright 2010 Red Hat, Inc. 6 * 7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from 8 * FB layer. 9 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com> 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sub license, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the 19 * next paragraph) shall be included in all copies or substantial portions 20 * of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 28 * DEALINGS IN THE SOFTWARE. 29 */ 30 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/i2c.h> 33 #include "drmP.h" 34 #include "drm_edid.h" 35 #include "drm_edid_modes.h" 36 37 #define version_greater(edid, maj, min) \ 38 (((edid)->version > (maj)) || \ 39 ((edid)->version == (maj) && (edid)->revision > (min))) 40 41 #define EDID_EST_TIMINGS 16 42 #define EDID_STD_TIMINGS 8 43 #define EDID_DETAILED_TIMINGS 4 44 45 /* 46 * EDID blocks out in the wild have a variety of bugs, try to collect 47 * them here (note that userspace may work around broken monitors first, 48 * but fixes should make their way here so that the kernel "just works" 49 * on as many displays as possible). 50 */ 51 52 /* First detailed mode wrong, use largest 60Hz mode */ 53 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 54 /* Reported 135MHz pixel clock is too high, needs adjustment */ 55 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 56 /* Prefer the largest mode at 75 Hz */ 57 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 58 /* Detail timing is in cm not mm */ 59 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 60 /* Detailed timing descriptors have bogus size values, so just take the 61 * maximum size and use that. 62 */ 63 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 64 /* Monitor forgot to set the first detailed is preferred bit. */ 65 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 66 /* use +hsync +vsync for detailed mode */ 67 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 68 69 struct detailed_mode_closure { 70 struct drm_connector *connector; 71 struct edid *edid; 72 bool preferred; 73 u32 quirks; 74 int modes; 75 }; 76 77 #define LEVEL_DMT 0 78 #define LEVEL_GTF 1 79 #define LEVEL_GTF2 2 80 #define LEVEL_CVT 3 81 82 static struct edid_quirk { 83 char *vendor; 84 int product_id; 85 u32 quirks; 86 } edid_quirk_list[] = { 87 /* Acer AL1706 */ 88 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 89 /* Acer F51 */ 90 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 91 /* Unknown Acer */ 92 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 93 94 /* Belinea 10 15 55 */ 95 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 96 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 97 98 /* Envision Peripherals, Inc. EN-7100e */ 99 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 100 /* Envision EN2028 */ 101 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 102 103 /* Funai Electronics PM36B */ 104 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 105 EDID_QUIRK_DETAILED_IN_CM }, 106 107 /* LG Philips LCD LP154W01-A5 */ 108 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 109 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 110 111 /* Philips 107p5 CRT */ 112 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 113 114 /* Proview AY765C */ 115 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 116 117 /* Samsung SyncMaster 205BW. Note: irony */ 118 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 119 /* Samsung SyncMaster 22[5-6]BW */ 120 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 121 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 122 }; 123 124 /*** DDC fetch and block validation ***/ 125 126 static const u8 edid_header[] = { 127 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 128 }; 129 130 /* 131 * Sanity check the EDID block (base or extension). Return 0 if the block 132 * doesn't check out, or 1 if it's valid. 133 */ 134 static bool 135 drm_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; 184 185 bad: 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 */ 200 bool 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 } 214 EXPORT_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 */ 228 static int 229 drm_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 struct i2c_msg msgs[] = { 234 { 235 .addr = DDC_ADDR, 236 .flags = 0, 237 .len = 1, 238 .buf = &start, 239 }, { 240 .addr = DDC_ADDR, 241 .flags = I2C_M_RD, 242 .len = len, 243 .buf = buf, 244 } 245 }; 246 247 if (i2c_transfer(adapter, msgs, 2) == 2) 248 return 0; 249 250 return -1; 251 } 252 253 static u8 * 254 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 255 { 256 int i, j = 0, valid_extensions = 0; 257 u8 *block, *new; 258 259 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 260 return NULL; 261 262 /* base block fetch */ 263 for (i = 0; i < 4; i++) { 264 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 265 goto out; 266 if (drm_edid_block_valid(block)) 267 break; 268 } 269 if (i == 4) 270 goto carp; 271 272 /* if there's no extensions, we're done */ 273 if (block[0x7e] == 0) 274 return block; 275 276 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 277 if (!new) 278 goto out; 279 block = new; 280 281 for (j = 1; j <= block[0x7e]; j++) { 282 for (i = 0; i < 4; i++) { 283 if (drm_do_probe_ddc_edid(adapter, 284 block + (valid_extensions + 1) * EDID_LENGTH, 285 j, EDID_LENGTH)) 286 goto out; 287 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 288 valid_extensions++; 289 break; 290 } 291 } 292 if (i == 4) 293 dev_warn(connector->dev->dev, 294 "%s: Ignoring invalid EDID block %d.\n", 295 drm_get_connector_name(connector), j); 296 } 297 298 if (valid_extensions != block[0x7e]) { 299 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 300 block[0x7e] = valid_extensions; 301 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 302 if (!new) 303 goto out; 304 block = new; 305 } 306 307 return block; 308 309 carp: 310 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 311 drm_get_connector_name(connector), j); 312 313 out: 314 kfree(block); 315 return NULL; 316 } 317 318 /** 319 * Probe DDC presence. 320 * 321 * \param adapter : i2c device adaptor 322 * \return 1 on success 323 */ 324 static bool 325 drm_probe_ddc(struct i2c_adapter *adapter) 326 { 327 unsigned char out; 328 329 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 330 } 331 332 /** 333 * drm_get_edid - get EDID data, if available 334 * @connector: connector we're probing 335 * @adapter: i2c adapter to use for DDC 336 * 337 * Poke the given i2c channel to grab EDID data if possible. If found, 338 * attach it to the connector. 339 * 340 * Return edid data or NULL if we couldn't find any. 341 */ 342 struct edid *drm_get_edid(struct drm_connector *connector, 343 struct i2c_adapter *adapter) 344 { 345 struct edid *edid = NULL; 346 347 if (drm_probe_ddc(adapter)) 348 edid = (struct edid *)drm_do_get_edid(connector, adapter); 349 350 connector->display_info.raw_edid = (char *)edid; 351 352 return edid; 353 354 } 355 EXPORT_SYMBOL(drm_get_edid); 356 357 /*** EDID parsing ***/ 358 359 /** 360 * edid_vendor - match a string against EDID's obfuscated vendor field 361 * @edid: EDID to match 362 * @vendor: vendor string 363 * 364 * Returns true if @vendor is in @edid, false otherwise 365 */ 366 static bool edid_vendor(struct edid *edid, char *vendor) 367 { 368 char edid_vendor[3]; 369 370 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 371 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 372 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 373 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 374 375 return !strncmp(edid_vendor, vendor, 3); 376 } 377 378 /** 379 * edid_get_quirks - return quirk flags for a given EDID 380 * @edid: EDID to process 381 * 382 * This tells subsequent routines what fixes they need to apply. 383 */ 384 static u32 edid_get_quirks(struct edid *edid) 385 { 386 struct edid_quirk *quirk; 387 int i; 388 389 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 390 quirk = &edid_quirk_list[i]; 391 392 if (edid_vendor(edid, quirk->vendor) && 393 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 394 return quirk->quirks; 395 } 396 397 return 0; 398 } 399 400 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 401 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 402 403 /** 404 * edid_fixup_preferred - set preferred modes based on quirk list 405 * @connector: has mode list to fix up 406 * @quirks: quirks list 407 * 408 * Walk the mode list for @connector, clearing the preferred status 409 * on existing modes and setting it anew for the right mode ala @quirks. 410 */ 411 static void edid_fixup_preferred(struct drm_connector *connector, 412 u32 quirks) 413 { 414 struct drm_display_mode *t, *cur_mode, *preferred_mode; 415 int target_refresh = 0; 416 417 if (list_empty(&connector->probed_modes)) 418 return; 419 420 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 421 target_refresh = 60; 422 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 423 target_refresh = 75; 424 425 preferred_mode = list_first_entry(&connector->probed_modes, 426 struct drm_display_mode, head); 427 428 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 429 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 430 431 if (cur_mode == preferred_mode) 432 continue; 433 434 /* Largest mode is preferred */ 435 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 436 preferred_mode = cur_mode; 437 438 /* At a given size, try to get closest to target refresh */ 439 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 440 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 441 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 442 preferred_mode = cur_mode; 443 } 444 } 445 446 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 447 } 448 449 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 450 int hsize, int vsize, int fresh) 451 { 452 int i; 453 struct drm_display_mode *ptr, *mode; 454 455 mode = NULL; 456 for (i = 0; i < drm_num_dmt_modes; i++) { 457 ptr = &drm_dmt_modes[i]; 458 if (hsize == ptr->hdisplay && 459 vsize == ptr->vdisplay && 460 fresh == drm_mode_vrefresh(ptr)) { 461 /* get the expected default mode */ 462 mode = drm_mode_duplicate(dev, ptr); 463 break; 464 } 465 } 466 return mode; 467 } 468 EXPORT_SYMBOL(drm_mode_find_dmt); 469 470 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 471 472 static void 473 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 474 { 475 int i, n = 0; 476 u8 rev = ext[0x01], d = ext[0x02]; 477 u8 *det_base = ext + d; 478 479 switch (rev) { 480 case 0: 481 /* can't happen */ 482 return; 483 case 1: 484 /* have to infer how many blocks we have, check pixel clock */ 485 for (i = 0; i < 6; i++) 486 if (det_base[18*i] || det_base[18*i+1]) 487 n++; 488 break; 489 default: 490 /* explicit count */ 491 n = min(ext[0x03] & 0x0f, 6); 492 break; 493 } 494 495 for (i = 0; i < n; i++) 496 cb((struct detailed_timing *)(det_base + 18 * i), closure); 497 } 498 499 static void 500 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 501 { 502 unsigned int i, n = min((int)ext[0x02], 6); 503 u8 *det_base = ext + 5; 504 505 if (ext[0x01] != 1) 506 return; /* unknown version */ 507 508 for (i = 0; i < n; i++) 509 cb((struct detailed_timing *)(det_base + 18 * i), closure); 510 } 511 512 static void 513 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 514 { 515 int i; 516 struct edid *edid = (struct edid *)raw_edid; 517 518 if (edid == NULL) 519 return; 520 521 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 522 cb(&(edid->detailed_timings[i]), closure); 523 524 for (i = 1; i <= raw_edid[0x7e]; i++) { 525 u8 *ext = raw_edid + (i * EDID_LENGTH); 526 switch (*ext) { 527 case CEA_EXT: 528 cea_for_each_detailed_block(ext, cb, closure); 529 break; 530 case VTB_EXT: 531 vtb_for_each_detailed_block(ext, cb, closure); 532 break; 533 default: 534 break; 535 } 536 } 537 } 538 539 static void 540 is_rb(struct detailed_timing *t, void *data) 541 { 542 u8 *r = (u8 *)t; 543 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 544 if (r[15] & 0x10) 545 *(bool *)data = true; 546 } 547 548 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 549 static bool 550 drm_monitor_supports_rb(struct edid *edid) 551 { 552 if (edid->revision >= 4) { 553 bool ret; 554 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 555 return ret; 556 } 557 558 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 559 } 560 561 static void 562 find_gtf2(struct detailed_timing *t, void *data) 563 { 564 u8 *r = (u8 *)t; 565 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 566 *(u8 **)data = r; 567 } 568 569 /* Secondary GTF curve kicks in above some break frequency */ 570 static int 571 drm_gtf2_hbreak(struct edid *edid) 572 { 573 u8 *r = NULL; 574 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 575 return r ? (r[12] * 2) : 0; 576 } 577 578 static int 579 drm_gtf2_2c(struct edid *edid) 580 { 581 u8 *r = NULL; 582 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 583 return r ? r[13] : 0; 584 } 585 586 static int 587 drm_gtf2_m(struct edid *edid) 588 { 589 u8 *r = NULL; 590 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 591 return r ? (r[15] << 8) + r[14] : 0; 592 } 593 594 static int 595 drm_gtf2_k(struct edid *edid) 596 { 597 u8 *r = NULL; 598 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 599 return r ? r[16] : 0; 600 } 601 602 static int 603 drm_gtf2_2j(struct edid *edid) 604 { 605 u8 *r = NULL; 606 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 607 return r ? r[17] : 0; 608 } 609 610 /** 611 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 612 * @edid: EDID block to scan 613 */ 614 static int standard_timing_level(struct edid *edid) 615 { 616 if (edid->revision >= 2) { 617 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 618 return LEVEL_CVT; 619 if (drm_gtf2_hbreak(edid)) 620 return LEVEL_GTF2; 621 return LEVEL_GTF; 622 } 623 return LEVEL_DMT; 624 } 625 626 /* 627 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 628 * monitors fill with ascii space (0x20) instead. 629 */ 630 static int 631 bad_std_timing(u8 a, u8 b) 632 { 633 return (a == 0x00 && b == 0x00) || 634 (a == 0x01 && b == 0x01) || 635 (a == 0x20 && b == 0x20); 636 } 637 638 /** 639 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 640 * @t: standard timing params 641 * @timing_level: standard timing level 642 * 643 * Take the standard timing params (in this case width, aspect, and refresh) 644 * and convert them into a real mode using CVT/GTF/DMT. 645 */ 646 static struct drm_display_mode * 647 drm_mode_std(struct drm_connector *connector, struct edid *edid, 648 struct std_timing *t, int revision) 649 { 650 struct drm_device *dev = connector->dev; 651 struct drm_display_mode *m, *mode = NULL; 652 int hsize, vsize; 653 int vrefresh_rate; 654 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 655 >> EDID_TIMING_ASPECT_SHIFT; 656 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 657 >> EDID_TIMING_VFREQ_SHIFT; 658 int timing_level = standard_timing_level(edid); 659 660 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 661 return NULL; 662 663 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 664 hsize = t->hsize * 8 + 248; 665 /* vrefresh_rate = vfreq + 60 */ 666 vrefresh_rate = vfreq + 60; 667 /* the vdisplay is calculated based on the aspect ratio */ 668 if (aspect_ratio == 0) { 669 if (revision < 3) 670 vsize = hsize; 671 else 672 vsize = (hsize * 10) / 16; 673 } else if (aspect_ratio == 1) 674 vsize = (hsize * 3) / 4; 675 else if (aspect_ratio == 2) 676 vsize = (hsize * 4) / 5; 677 else 678 vsize = (hsize * 9) / 16; 679 680 /* HDTV hack, part 1 */ 681 if (vrefresh_rate == 60 && 682 ((hsize == 1360 && vsize == 765) || 683 (hsize == 1368 && vsize == 769))) { 684 hsize = 1366; 685 vsize = 768; 686 } 687 688 /* 689 * If this connector already has a mode for this size and refresh 690 * rate (because it came from detailed or CVT info), use that 691 * instead. This way we don't have to guess at interlace or 692 * reduced blanking. 693 */ 694 list_for_each_entry(m, &connector->probed_modes, head) 695 if (m->hdisplay == hsize && m->vdisplay == vsize && 696 drm_mode_vrefresh(m) == vrefresh_rate) 697 return NULL; 698 699 /* HDTV hack, part 2 */ 700 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 701 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 702 false); 703 mode->hdisplay = 1366; 704 mode->hsync_start = mode->hsync_start - 1; 705 mode->hsync_end = mode->hsync_end - 1; 706 return mode; 707 } 708 709 /* check whether it can be found in default mode table */ 710 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 711 if (mode) 712 return mode; 713 714 switch (timing_level) { 715 case LEVEL_DMT: 716 break; 717 case LEVEL_GTF: 718 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 719 break; 720 case LEVEL_GTF2: 721 /* 722 * This is potentially wrong if there's ever a monitor with 723 * more than one ranges section, each claiming a different 724 * secondary GTF curve. Please don't do that. 725 */ 726 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 727 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 728 kfree(mode); 729 mode = drm_gtf_mode_complex(dev, hsize, vsize, 730 vrefresh_rate, 0, 0, 731 drm_gtf2_m(edid), 732 drm_gtf2_2c(edid), 733 drm_gtf2_k(edid), 734 drm_gtf2_2j(edid)); 735 } 736 break; 737 case LEVEL_CVT: 738 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 739 false); 740 break; 741 } 742 return mode; 743 } 744 745 /* 746 * EDID is delightfully ambiguous about how interlaced modes are to be 747 * encoded. Our internal representation is of frame height, but some 748 * HDTV detailed timings are encoded as field height. 749 * 750 * The format list here is from CEA, in frame size. Technically we 751 * should be checking refresh rate too. Whatever. 752 */ 753 static void 754 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 755 struct detailed_pixel_timing *pt) 756 { 757 int i; 758 static const struct { 759 int w, h; 760 } cea_interlaced[] = { 761 { 1920, 1080 }, 762 { 720, 480 }, 763 { 1440, 480 }, 764 { 2880, 480 }, 765 { 720, 576 }, 766 { 1440, 576 }, 767 { 2880, 576 }, 768 }; 769 770 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 771 return; 772 773 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 774 if ((mode->hdisplay == cea_interlaced[i].w) && 775 (mode->vdisplay == cea_interlaced[i].h / 2)) { 776 mode->vdisplay *= 2; 777 mode->vsync_start *= 2; 778 mode->vsync_end *= 2; 779 mode->vtotal *= 2; 780 mode->vtotal |= 1; 781 } 782 } 783 784 mode->flags |= DRM_MODE_FLAG_INTERLACE; 785 } 786 787 /** 788 * drm_mode_detailed - create a new mode from an EDID detailed timing section 789 * @dev: DRM device (needed to create new mode) 790 * @edid: EDID block 791 * @timing: EDID detailed timing info 792 * @quirks: quirks to apply 793 * 794 * An EDID detailed timing block contains enough info for us to create and 795 * return a new struct drm_display_mode. 796 */ 797 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 798 struct edid *edid, 799 struct detailed_timing *timing, 800 u32 quirks) 801 { 802 struct drm_display_mode *mode; 803 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 804 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 805 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 806 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 807 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 808 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 809 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 810 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 811 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 812 813 /* ignore tiny modes */ 814 if (hactive < 64 || vactive < 64) 815 return NULL; 816 817 if (pt->misc & DRM_EDID_PT_STEREO) { 818 printk(KERN_WARNING "stereo mode not supported\n"); 819 return NULL; 820 } 821 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 822 printk(KERN_WARNING "composite sync not supported\n"); 823 } 824 825 /* it is incorrect if hsync/vsync width is zero */ 826 if (!hsync_pulse_width || !vsync_pulse_width) { 827 DRM_DEBUG_KMS("Incorrect Detailed timing. " 828 "Wrong Hsync/Vsync pulse width\n"); 829 return NULL; 830 } 831 mode = drm_mode_create(dev); 832 if (!mode) 833 return NULL; 834 835 mode->type = DRM_MODE_TYPE_DRIVER; 836 837 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 838 timing->pixel_clock = cpu_to_le16(1088); 839 840 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 841 842 mode->hdisplay = hactive; 843 mode->hsync_start = mode->hdisplay + hsync_offset; 844 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 845 mode->htotal = mode->hdisplay + hblank; 846 847 mode->vdisplay = vactive; 848 mode->vsync_start = mode->vdisplay + vsync_offset; 849 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 850 mode->vtotal = mode->vdisplay + vblank; 851 852 /* Some EDIDs have bogus h/vtotal values */ 853 if (mode->hsync_end > mode->htotal) 854 mode->htotal = mode->hsync_end + 1; 855 if (mode->vsync_end > mode->vtotal) 856 mode->vtotal = mode->vsync_end + 1; 857 858 drm_mode_do_interlace_quirk(mode, pt); 859 860 drm_mode_set_name(mode); 861 862 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 863 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 864 } 865 866 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 867 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 868 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 869 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 870 871 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 872 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 873 874 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 875 mode->width_mm *= 10; 876 mode->height_mm *= 10; 877 } 878 879 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 880 mode->width_mm = edid->width_cm * 10; 881 mode->height_mm = edid->height_cm * 10; 882 } 883 884 return mode; 885 } 886 887 static bool 888 mode_is_rb(struct drm_display_mode *mode) 889 { 890 return (mode->htotal - mode->hdisplay == 160) && 891 (mode->hsync_end - mode->hdisplay == 80) && 892 (mode->hsync_end - mode->hsync_start == 32) && 893 (mode->vsync_start - mode->vdisplay == 3); 894 } 895 896 static bool 897 mode_in_hsync_range(struct drm_display_mode *mode, struct edid *edid, u8 *t) 898 { 899 int hsync, hmin, hmax; 900 901 hmin = t[7]; 902 if (edid->revision >= 4) 903 hmin += ((t[4] & 0x04) ? 255 : 0); 904 hmax = t[8]; 905 if (edid->revision >= 4) 906 hmax += ((t[4] & 0x08) ? 255 : 0); 907 hsync = drm_mode_hsync(mode); 908 909 return (hsync <= hmax && hsync >= hmin); 910 } 911 912 static bool 913 mode_in_vsync_range(struct drm_display_mode *mode, struct edid *edid, u8 *t) 914 { 915 int vsync, vmin, vmax; 916 917 vmin = t[5]; 918 if (edid->revision >= 4) 919 vmin += ((t[4] & 0x01) ? 255 : 0); 920 vmax = t[6]; 921 if (edid->revision >= 4) 922 vmax += ((t[4] & 0x02) ? 255 : 0); 923 vsync = drm_mode_vrefresh(mode); 924 925 return (vsync <= vmax && vsync >= vmin); 926 } 927 928 static u32 929 range_pixel_clock(struct edid *edid, u8 *t) 930 { 931 /* unspecified */ 932 if (t[9] == 0 || t[9] == 255) 933 return 0; 934 935 /* 1.4 with CVT support gives us real precision, yay */ 936 if (edid->revision >= 4 && t[10] == 0x04) 937 return (t[9] * 10000) - ((t[12] >> 2) * 250); 938 939 /* 1.3 is pathetic, so fuzz up a bit */ 940 return t[9] * 10000 + 5001; 941 } 942 943 static bool 944 mode_in_range(struct drm_display_mode *mode, struct edid *edid, 945 struct detailed_timing *timing) 946 { 947 u32 max_clock; 948 u8 *t = (u8 *)timing; 949 950 if (!mode_in_hsync_range(mode, edid, t)) 951 return false; 952 953 if (!mode_in_vsync_range(mode, edid, t)) 954 return false; 955 956 if ((max_clock = range_pixel_clock(edid, t))) 957 if (mode->clock > max_clock) 958 return false; 959 960 /* 1.4 max horizontal check */ 961 if (edid->revision >= 4 && t[10] == 0x04) 962 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 963 return false; 964 965 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 966 return false; 967 968 return true; 969 } 970 971 /* 972 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 973 * need to account for them. 974 */ 975 static int 976 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 977 struct detailed_timing *timing) 978 { 979 int i, modes = 0; 980 struct drm_display_mode *newmode; 981 struct drm_device *dev = connector->dev; 982 983 for (i = 0; i < drm_num_dmt_modes; i++) { 984 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 985 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 986 if (newmode) { 987 drm_mode_probed_add(connector, newmode); 988 modes++; 989 } 990 } 991 } 992 993 return modes; 994 } 995 996 static void 997 do_inferred_modes(struct detailed_timing *timing, void *c) 998 { 999 struct detailed_mode_closure *closure = c; 1000 struct detailed_non_pixel *data = &timing->data.other_data; 1001 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1002 1003 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1004 closure->modes += drm_gtf_modes_for_range(closure->connector, 1005 closure->edid, 1006 timing); 1007 } 1008 1009 static int 1010 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1011 { 1012 struct detailed_mode_closure closure = { 1013 connector, edid, 0, 0, 0 1014 }; 1015 1016 if (version_greater(edid, 1, 0)) 1017 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1018 &closure); 1019 1020 return closure.modes; 1021 } 1022 1023 static int 1024 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1025 { 1026 int i, j, m, modes = 0; 1027 struct drm_display_mode *mode; 1028 u8 *est = ((u8 *)timing) + 5; 1029 1030 for (i = 0; i < 6; i++) { 1031 for (j = 7; j > 0; j--) { 1032 m = (i * 8) + (7 - j); 1033 if (m >= ARRAY_SIZE(est3_modes)) 1034 break; 1035 if (est[i] & (1 << j)) { 1036 mode = drm_mode_find_dmt(connector->dev, 1037 est3_modes[m].w, 1038 est3_modes[m].h, 1039 est3_modes[m].r 1040 /*, est3_modes[m].rb */); 1041 if (mode) { 1042 drm_mode_probed_add(connector, mode); 1043 modes++; 1044 } 1045 } 1046 } 1047 } 1048 1049 return modes; 1050 } 1051 1052 static void 1053 do_established_modes(struct detailed_timing *timing, void *c) 1054 { 1055 struct detailed_mode_closure *closure = c; 1056 struct detailed_non_pixel *data = &timing->data.other_data; 1057 1058 if (data->type == EDID_DETAIL_EST_TIMINGS) 1059 closure->modes += drm_est3_modes(closure->connector, timing); 1060 } 1061 1062 /** 1063 * add_established_modes - get est. modes from EDID and add them 1064 * @edid: EDID block to scan 1065 * 1066 * Each EDID block contains a bitmap of the supported "established modes" list 1067 * (defined above). Tease them out and add them to the global modes list. 1068 */ 1069 static int 1070 add_established_modes(struct drm_connector *connector, struct edid *edid) 1071 { 1072 struct drm_device *dev = connector->dev; 1073 unsigned long est_bits = edid->established_timings.t1 | 1074 (edid->established_timings.t2 << 8) | 1075 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1076 int i, modes = 0; 1077 struct detailed_mode_closure closure = { 1078 connector, edid, 0, 0, 0 1079 }; 1080 1081 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1082 if (est_bits & (1<<i)) { 1083 struct drm_display_mode *newmode; 1084 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1085 if (newmode) { 1086 drm_mode_probed_add(connector, newmode); 1087 modes++; 1088 } 1089 } 1090 } 1091 1092 if (version_greater(edid, 1, 0)) 1093 drm_for_each_detailed_block((u8 *)edid, 1094 do_established_modes, &closure); 1095 1096 return modes + closure.modes; 1097 } 1098 1099 static void 1100 do_standard_modes(struct detailed_timing *timing, void *c) 1101 { 1102 struct detailed_mode_closure *closure = c; 1103 struct detailed_non_pixel *data = &timing->data.other_data; 1104 struct drm_connector *connector = closure->connector; 1105 struct edid *edid = closure->edid; 1106 1107 if (data->type == EDID_DETAIL_STD_MODES) { 1108 int i; 1109 for (i = 0; i < 6; i++) { 1110 struct std_timing *std; 1111 struct drm_display_mode *newmode; 1112 1113 std = &data->data.timings[i]; 1114 newmode = drm_mode_std(connector, edid, std, 1115 edid->revision); 1116 if (newmode) { 1117 drm_mode_probed_add(connector, newmode); 1118 closure->modes++; 1119 } 1120 } 1121 } 1122 } 1123 1124 /** 1125 * add_standard_modes - get std. modes from EDID and add them 1126 * @edid: EDID block to scan 1127 * 1128 * Standard modes can be calculated using the appropriate standard (DMT, 1129 * GTF or CVT. Grab them from @edid and add them to the list. 1130 */ 1131 static int 1132 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1133 { 1134 int i, modes = 0; 1135 struct detailed_mode_closure closure = { 1136 connector, edid, 0, 0, 0 1137 }; 1138 1139 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1140 struct drm_display_mode *newmode; 1141 1142 newmode = drm_mode_std(connector, edid, 1143 &edid->standard_timings[i], 1144 edid->revision); 1145 if (newmode) { 1146 drm_mode_probed_add(connector, newmode); 1147 modes++; 1148 } 1149 } 1150 1151 if (version_greater(edid, 1, 0)) 1152 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1153 &closure); 1154 1155 /* XXX should also look for standard codes in VTB blocks */ 1156 1157 return modes + closure.modes; 1158 } 1159 1160 static int drm_cvt_modes(struct drm_connector *connector, 1161 struct detailed_timing *timing) 1162 { 1163 int i, j, modes = 0; 1164 struct drm_display_mode *newmode; 1165 struct drm_device *dev = connector->dev; 1166 struct cvt_timing *cvt; 1167 const int rates[] = { 60, 85, 75, 60, 50 }; 1168 const u8 empty[3] = { 0, 0, 0 }; 1169 1170 for (i = 0; i < 4; i++) { 1171 int uninitialized_var(width), height; 1172 cvt = &(timing->data.other_data.data.cvt[i]); 1173 1174 if (!memcmp(cvt->code, empty, 3)) 1175 continue; 1176 1177 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1178 switch (cvt->code[1] & 0x0c) { 1179 case 0x00: 1180 width = height * 4 / 3; 1181 break; 1182 case 0x04: 1183 width = height * 16 / 9; 1184 break; 1185 case 0x08: 1186 width = height * 16 / 10; 1187 break; 1188 case 0x0c: 1189 width = height * 15 / 9; 1190 break; 1191 } 1192 1193 for (j = 1; j < 5; j++) { 1194 if (cvt->code[2] & (1 << j)) { 1195 newmode = drm_cvt_mode(dev, width, height, 1196 rates[j], j == 0, 1197 false, false); 1198 if (newmode) { 1199 drm_mode_probed_add(connector, newmode); 1200 modes++; 1201 } 1202 } 1203 } 1204 } 1205 1206 return modes; 1207 } 1208 1209 static void 1210 do_cvt_mode(struct detailed_timing *timing, void *c) 1211 { 1212 struct detailed_mode_closure *closure = c; 1213 struct detailed_non_pixel *data = &timing->data.other_data; 1214 1215 if (data->type == EDID_DETAIL_CVT_3BYTE) 1216 closure->modes += drm_cvt_modes(closure->connector, timing); 1217 } 1218 1219 static int 1220 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1221 { 1222 struct detailed_mode_closure closure = { 1223 connector, edid, 0, 0, 0 1224 }; 1225 1226 if (version_greater(edid, 1, 2)) 1227 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1228 1229 /* XXX should also look for CVT codes in VTB blocks */ 1230 1231 return closure.modes; 1232 } 1233 1234 static void 1235 do_detailed_mode(struct detailed_timing *timing, void *c) 1236 { 1237 struct detailed_mode_closure *closure = c; 1238 struct drm_display_mode *newmode; 1239 1240 if (timing->pixel_clock) { 1241 newmode = drm_mode_detailed(closure->connector->dev, 1242 closure->edid, timing, 1243 closure->quirks); 1244 if (!newmode) 1245 return; 1246 1247 if (closure->preferred) 1248 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1249 1250 drm_mode_probed_add(closure->connector, newmode); 1251 closure->modes++; 1252 closure->preferred = 0; 1253 } 1254 } 1255 1256 /* 1257 * add_detailed_modes - Add modes from detailed timings 1258 * @connector: attached connector 1259 * @edid: EDID block to scan 1260 * @quirks: quirks to apply 1261 */ 1262 static int 1263 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1264 u32 quirks) 1265 { 1266 struct detailed_mode_closure closure = { 1267 connector, 1268 edid, 1269 1, 1270 quirks, 1271 0 1272 }; 1273 1274 if (closure.preferred && !version_greater(edid, 1, 3)) 1275 closure.preferred = 1276 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1277 1278 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1279 1280 return closure.modes; 1281 } 1282 1283 #define HDMI_IDENTIFIER 0x000C03 1284 #define AUDIO_BLOCK 0x01 1285 #define VENDOR_BLOCK 0x03 1286 #define EDID_BASIC_AUDIO (1 << 6) 1287 1288 /** 1289 * Search EDID for CEA extension block. 1290 */ 1291 static u8 *drm_find_cea_extension(struct edid *edid) 1292 { 1293 u8 *edid_ext = NULL; 1294 int i; 1295 1296 /* No EDID or EDID extensions */ 1297 if (edid == NULL || edid->extensions == 0) 1298 return NULL; 1299 1300 /* Find CEA extension */ 1301 for (i = 0; i < edid->extensions; i++) { 1302 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1303 if (edid_ext[0] == CEA_EXT) 1304 break; 1305 } 1306 1307 if (i == edid->extensions) 1308 return NULL; 1309 1310 return edid_ext; 1311 } 1312 1313 /** 1314 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1315 * @edid: monitor EDID information 1316 * 1317 * Parse the CEA extension according to CEA-861-B. 1318 * Return true if HDMI, false if not or unknown. 1319 */ 1320 bool drm_detect_hdmi_monitor(struct edid *edid) 1321 { 1322 u8 *edid_ext; 1323 int i, hdmi_id; 1324 int start_offset, end_offset; 1325 bool is_hdmi = false; 1326 1327 edid_ext = drm_find_cea_extension(edid); 1328 if (!edid_ext) 1329 goto end; 1330 1331 /* Data block offset in CEA extension block */ 1332 start_offset = 4; 1333 end_offset = edid_ext[2]; 1334 1335 /* 1336 * Because HDMI identifier is in Vendor Specific Block, 1337 * search it from all data blocks of CEA extension. 1338 */ 1339 for (i = start_offset; i < end_offset; 1340 /* Increased by data block len */ 1341 i += ((edid_ext[i] & 0x1f) + 1)) { 1342 /* Find vendor specific block */ 1343 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1344 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1345 edid_ext[i + 3] << 16; 1346 /* Find HDMI identifier */ 1347 if (hdmi_id == HDMI_IDENTIFIER) 1348 is_hdmi = true; 1349 break; 1350 } 1351 } 1352 1353 end: 1354 return is_hdmi; 1355 } 1356 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1357 1358 /** 1359 * drm_detect_monitor_audio - check monitor audio capability 1360 * 1361 * Monitor should have CEA extension block. 1362 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1363 * audio' only. If there is any audio extension block and supported 1364 * audio format, assume at least 'basic audio' support, even if 'basic 1365 * audio' is not defined in EDID. 1366 * 1367 */ 1368 bool drm_detect_monitor_audio(struct edid *edid) 1369 { 1370 u8 *edid_ext; 1371 int i, j; 1372 bool has_audio = false; 1373 int start_offset, end_offset; 1374 1375 edid_ext = drm_find_cea_extension(edid); 1376 if (!edid_ext) 1377 goto end; 1378 1379 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1380 1381 if (has_audio) { 1382 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1383 goto end; 1384 } 1385 1386 /* Data block offset in CEA extension block */ 1387 start_offset = 4; 1388 end_offset = edid_ext[2]; 1389 1390 for (i = start_offset; i < end_offset; 1391 i += ((edid_ext[i] & 0x1f) + 1)) { 1392 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1393 has_audio = true; 1394 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1395 DRM_DEBUG_KMS("CEA audio format %d\n", 1396 (edid_ext[i + j] >> 3) & 0xf); 1397 goto end; 1398 } 1399 } 1400 end: 1401 return has_audio; 1402 } 1403 EXPORT_SYMBOL(drm_detect_monitor_audio); 1404 1405 /** 1406 * drm_add_edid_modes - add modes from EDID data, if available 1407 * @connector: connector we're probing 1408 * @edid: edid data 1409 * 1410 * Add the specified modes to the connector's mode list. 1411 * 1412 * Return number of modes added or 0 if we couldn't find any. 1413 */ 1414 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1415 { 1416 int num_modes = 0; 1417 u32 quirks; 1418 1419 if (edid == NULL) { 1420 return 0; 1421 } 1422 if (!drm_edid_is_valid(edid)) { 1423 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1424 drm_get_connector_name(connector)); 1425 return 0; 1426 } 1427 1428 quirks = edid_get_quirks(edid); 1429 1430 /* 1431 * EDID spec says modes should be preferred in this order: 1432 * - preferred detailed mode 1433 * - other detailed modes from base block 1434 * - detailed modes from extension blocks 1435 * - CVT 3-byte code modes 1436 * - standard timing codes 1437 * - established timing codes 1438 * - modes inferred from GTF or CVT range information 1439 * 1440 * We get this pretty much right. 1441 * 1442 * XXX order for additional mode types in extension blocks? 1443 */ 1444 num_modes += add_detailed_modes(connector, edid, quirks); 1445 num_modes += add_cvt_modes(connector, edid); 1446 num_modes += add_standard_modes(connector, edid); 1447 num_modes += add_established_modes(connector, edid); 1448 num_modes += add_inferred_modes(connector, edid); 1449 1450 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1451 edid_fixup_preferred(connector, quirks); 1452 1453 connector->display_info.width_mm = edid->width_cm * 10; 1454 connector->display_info.height_mm = edid->height_cm * 10; 1455 1456 return num_modes; 1457 } 1458 EXPORT_SYMBOL(drm_add_edid_modes); 1459 1460 /** 1461 * drm_add_modes_noedid - add modes for the connectors without EDID 1462 * @connector: connector we're probing 1463 * @hdisplay: the horizontal display limit 1464 * @vdisplay: the vertical display limit 1465 * 1466 * Add the specified modes to the connector's mode list. Only when the 1467 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1468 * 1469 * Return number of modes added or 0 if we couldn't find any. 1470 */ 1471 int drm_add_modes_noedid(struct drm_connector *connector, 1472 int hdisplay, int vdisplay) 1473 { 1474 int i, count, num_modes = 0; 1475 struct drm_display_mode *mode, *ptr; 1476 struct drm_device *dev = connector->dev; 1477 1478 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1479 if (hdisplay < 0) 1480 hdisplay = 0; 1481 if (vdisplay < 0) 1482 vdisplay = 0; 1483 1484 for (i = 0; i < count; i++) { 1485 ptr = &drm_dmt_modes[i]; 1486 if (hdisplay && vdisplay) { 1487 /* 1488 * Only when two are valid, they will be used to check 1489 * whether the mode should be added to the mode list of 1490 * the connector. 1491 */ 1492 if (ptr->hdisplay > hdisplay || 1493 ptr->vdisplay > vdisplay) 1494 continue; 1495 } 1496 if (drm_mode_vrefresh(ptr) > 61) 1497 continue; 1498 mode = drm_mode_duplicate(dev, ptr); 1499 if (mode) { 1500 drm_mode_probed_add(connector, mode); 1501 num_modes++; 1502 } 1503 } 1504 return num_modes; 1505 } 1506 EXPORT_SYMBOL(drm_add_modes_noedid); 1507