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 struct drm_display_mode *mode = NULL; 453 int i; 454 455 for (i = 0; i < drm_num_dmt_modes; i++) { 456 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 457 if (hsize == ptr->hdisplay && 458 vsize == ptr->vdisplay && 459 fresh == drm_mode_vrefresh(ptr)) { 460 /* get the expected default mode */ 461 mode = drm_mode_duplicate(dev, ptr); 462 break; 463 } 464 } 465 return mode; 466 } 467 EXPORT_SYMBOL(drm_mode_find_dmt); 468 469 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 470 471 static void 472 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 473 { 474 int i, n = 0; 475 u8 rev = ext[0x01], d = ext[0x02]; 476 u8 *det_base = ext + d; 477 478 switch (rev) { 479 case 0: 480 /* can't happen */ 481 return; 482 case 1: 483 /* have to infer how many blocks we have, check pixel clock */ 484 for (i = 0; i < 6; i++) 485 if (det_base[18*i] || det_base[18*i+1]) 486 n++; 487 break; 488 default: 489 /* explicit count */ 490 n = min(ext[0x03] & 0x0f, 6); 491 break; 492 } 493 494 for (i = 0; i < n; i++) 495 cb((struct detailed_timing *)(det_base + 18 * i), closure); 496 } 497 498 static void 499 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 500 { 501 unsigned int i, n = min((int)ext[0x02], 6); 502 u8 *det_base = ext + 5; 503 504 if (ext[0x01] != 1) 505 return; /* unknown version */ 506 507 for (i = 0; i < n; i++) 508 cb((struct detailed_timing *)(det_base + 18 * i), closure); 509 } 510 511 static void 512 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 513 { 514 int i; 515 struct edid *edid = (struct edid *)raw_edid; 516 517 if (edid == NULL) 518 return; 519 520 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 521 cb(&(edid->detailed_timings[i]), closure); 522 523 for (i = 1; i <= raw_edid[0x7e]; i++) { 524 u8 *ext = raw_edid + (i * EDID_LENGTH); 525 switch (*ext) { 526 case CEA_EXT: 527 cea_for_each_detailed_block(ext, cb, closure); 528 break; 529 case VTB_EXT: 530 vtb_for_each_detailed_block(ext, cb, closure); 531 break; 532 default: 533 break; 534 } 535 } 536 } 537 538 static void 539 is_rb(struct detailed_timing *t, void *data) 540 { 541 u8 *r = (u8 *)t; 542 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 543 if (r[15] & 0x10) 544 *(bool *)data = true; 545 } 546 547 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 548 static bool 549 drm_monitor_supports_rb(struct edid *edid) 550 { 551 if (edid->revision >= 4) { 552 bool ret; 553 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 554 return ret; 555 } 556 557 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 558 } 559 560 static void 561 find_gtf2(struct detailed_timing *t, void *data) 562 { 563 u8 *r = (u8 *)t; 564 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 565 *(u8 **)data = r; 566 } 567 568 /* Secondary GTF curve kicks in above some break frequency */ 569 static int 570 drm_gtf2_hbreak(struct edid *edid) 571 { 572 u8 *r = NULL; 573 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 574 return r ? (r[12] * 2) : 0; 575 } 576 577 static int 578 drm_gtf2_2c(struct edid *edid) 579 { 580 u8 *r = NULL; 581 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 582 return r ? r[13] : 0; 583 } 584 585 static int 586 drm_gtf2_m(struct edid *edid) 587 { 588 u8 *r = NULL; 589 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 590 return r ? (r[15] << 8) + r[14] : 0; 591 } 592 593 static int 594 drm_gtf2_k(struct edid *edid) 595 { 596 u8 *r = NULL; 597 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 598 return r ? r[16] : 0; 599 } 600 601 static int 602 drm_gtf2_2j(struct edid *edid) 603 { 604 u8 *r = NULL; 605 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 606 return r ? r[17] : 0; 607 } 608 609 /** 610 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 611 * @edid: EDID block to scan 612 */ 613 static int standard_timing_level(struct edid *edid) 614 { 615 if (edid->revision >= 2) { 616 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 617 return LEVEL_CVT; 618 if (drm_gtf2_hbreak(edid)) 619 return LEVEL_GTF2; 620 return LEVEL_GTF; 621 } 622 return LEVEL_DMT; 623 } 624 625 /* 626 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 627 * monitors fill with ascii space (0x20) instead. 628 */ 629 static int 630 bad_std_timing(u8 a, u8 b) 631 { 632 return (a == 0x00 && b == 0x00) || 633 (a == 0x01 && b == 0x01) || 634 (a == 0x20 && b == 0x20); 635 } 636 637 /** 638 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 639 * @t: standard timing params 640 * @timing_level: standard timing level 641 * 642 * Take the standard timing params (in this case width, aspect, and refresh) 643 * and convert them into a real mode using CVT/GTF/DMT. 644 */ 645 static struct drm_display_mode * 646 drm_mode_std(struct drm_connector *connector, struct edid *edid, 647 struct std_timing *t, int revision) 648 { 649 struct drm_device *dev = connector->dev; 650 struct drm_display_mode *m, *mode = NULL; 651 int hsize, vsize; 652 int vrefresh_rate; 653 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 654 >> EDID_TIMING_ASPECT_SHIFT; 655 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 656 >> EDID_TIMING_VFREQ_SHIFT; 657 int timing_level = standard_timing_level(edid); 658 659 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 660 return NULL; 661 662 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 663 hsize = t->hsize * 8 + 248; 664 /* vrefresh_rate = vfreq + 60 */ 665 vrefresh_rate = vfreq + 60; 666 /* the vdisplay is calculated based on the aspect ratio */ 667 if (aspect_ratio == 0) { 668 if (revision < 3) 669 vsize = hsize; 670 else 671 vsize = (hsize * 10) / 16; 672 } else if (aspect_ratio == 1) 673 vsize = (hsize * 3) / 4; 674 else if (aspect_ratio == 2) 675 vsize = (hsize * 4) / 5; 676 else 677 vsize = (hsize * 9) / 16; 678 679 /* HDTV hack, part 1 */ 680 if (vrefresh_rate == 60 && 681 ((hsize == 1360 && vsize == 765) || 682 (hsize == 1368 && vsize == 769))) { 683 hsize = 1366; 684 vsize = 768; 685 } 686 687 /* 688 * If this connector already has a mode for this size and refresh 689 * rate (because it came from detailed or CVT info), use that 690 * instead. This way we don't have to guess at interlace or 691 * reduced blanking. 692 */ 693 list_for_each_entry(m, &connector->probed_modes, head) 694 if (m->hdisplay == hsize && m->vdisplay == vsize && 695 drm_mode_vrefresh(m) == vrefresh_rate) 696 return NULL; 697 698 /* HDTV hack, part 2 */ 699 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 700 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 701 false); 702 mode->hdisplay = 1366; 703 mode->hsync_start = mode->hsync_start - 1; 704 mode->hsync_end = mode->hsync_end - 1; 705 return mode; 706 } 707 708 /* check whether it can be found in default mode table */ 709 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 710 if (mode) 711 return mode; 712 713 switch (timing_level) { 714 case LEVEL_DMT: 715 break; 716 case LEVEL_GTF: 717 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 718 break; 719 case LEVEL_GTF2: 720 /* 721 * This is potentially wrong if there's ever a monitor with 722 * more than one ranges section, each claiming a different 723 * secondary GTF curve. Please don't do that. 724 */ 725 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 726 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 727 kfree(mode); 728 mode = drm_gtf_mode_complex(dev, hsize, vsize, 729 vrefresh_rate, 0, 0, 730 drm_gtf2_m(edid), 731 drm_gtf2_2c(edid), 732 drm_gtf2_k(edid), 733 drm_gtf2_2j(edid)); 734 } 735 break; 736 case LEVEL_CVT: 737 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 738 false); 739 break; 740 } 741 return mode; 742 } 743 744 /* 745 * EDID is delightfully ambiguous about how interlaced modes are to be 746 * encoded. Our internal representation is of frame height, but some 747 * HDTV detailed timings are encoded as field height. 748 * 749 * The format list here is from CEA, in frame size. Technically we 750 * should be checking refresh rate too. Whatever. 751 */ 752 static void 753 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 754 struct detailed_pixel_timing *pt) 755 { 756 int i; 757 static const struct { 758 int w, h; 759 } cea_interlaced[] = { 760 { 1920, 1080 }, 761 { 720, 480 }, 762 { 1440, 480 }, 763 { 2880, 480 }, 764 { 720, 576 }, 765 { 1440, 576 }, 766 { 2880, 576 }, 767 }; 768 769 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 770 return; 771 772 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 773 if ((mode->hdisplay == cea_interlaced[i].w) && 774 (mode->vdisplay == cea_interlaced[i].h / 2)) { 775 mode->vdisplay *= 2; 776 mode->vsync_start *= 2; 777 mode->vsync_end *= 2; 778 mode->vtotal *= 2; 779 mode->vtotal |= 1; 780 } 781 } 782 783 mode->flags |= DRM_MODE_FLAG_INTERLACE; 784 } 785 786 /** 787 * drm_mode_detailed - create a new mode from an EDID detailed timing section 788 * @dev: DRM device (needed to create new mode) 789 * @edid: EDID block 790 * @timing: EDID detailed timing info 791 * @quirks: quirks to apply 792 * 793 * An EDID detailed timing block contains enough info for us to create and 794 * return a new struct drm_display_mode. 795 */ 796 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 797 struct edid *edid, 798 struct detailed_timing *timing, 799 u32 quirks) 800 { 801 struct drm_display_mode *mode; 802 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 803 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 804 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 805 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 806 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 807 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 808 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 809 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 810 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 811 812 /* ignore tiny modes */ 813 if (hactive < 64 || vactive < 64) 814 return NULL; 815 816 if (pt->misc & DRM_EDID_PT_STEREO) { 817 printk(KERN_WARNING "stereo mode not supported\n"); 818 return NULL; 819 } 820 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 821 printk(KERN_WARNING "composite sync not supported\n"); 822 } 823 824 /* it is incorrect if hsync/vsync width is zero */ 825 if (!hsync_pulse_width || !vsync_pulse_width) { 826 DRM_DEBUG_KMS("Incorrect Detailed timing. " 827 "Wrong Hsync/Vsync pulse width\n"); 828 return NULL; 829 } 830 mode = drm_mode_create(dev); 831 if (!mode) 832 return NULL; 833 834 mode->type = DRM_MODE_TYPE_DRIVER; 835 836 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 837 timing->pixel_clock = cpu_to_le16(1088); 838 839 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 840 841 mode->hdisplay = hactive; 842 mode->hsync_start = mode->hdisplay + hsync_offset; 843 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 844 mode->htotal = mode->hdisplay + hblank; 845 846 mode->vdisplay = vactive; 847 mode->vsync_start = mode->vdisplay + vsync_offset; 848 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 849 mode->vtotal = mode->vdisplay + vblank; 850 851 /* Some EDIDs have bogus h/vtotal values */ 852 if (mode->hsync_end > mode->htotal) 853 mode->htotal = mode->hsync_end + 1; 854 if (mode->vsync_end > mode->vtotal) 855 mode->vtotal = mode->vsync_end + 1; 856 857 drm_mode_do_interlace_quirk(mode, pt); 858 859 drm_mode_set_name(mode); 860 861 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 862 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 863 } 864 865 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 866 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 867 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 868 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 869 870 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 871 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 872 873 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 874 mode->width_mm *= 10; 875 mode->height_mm *= 10; 876 } 877 878 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 879 mode->width_mm = edid->width_cm * 10; 880 mode->height_mm = edid->height_cm * 10; 881 } 882 883 return mode; 884 } 885 886 static bool 887 mode_is_rb(const struct drm_display_mode *mode) 888 { 889 return (mode->htotal - mode->hdisplay == 160) && 890 (mode->hsync_end - mode->hdisplay == 80) && 891 (mode->hsync_end - mode->hsync_start == 32) && 892 (mode->vsync_start - mode->vdisplay == 3); 893 } 894 895 static bool 896 mode_in_hsync_range(const struct drm_display_mode *mode, 897 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(const struct drm_display_mode *mode, 914 struct edid *edid, u8 *t) 915 { 916 int vsync, vmin, vmax; 917 918 vmin = t[5]; 919 if (edid->revision >= 4) 920 vmin += ((t[4] & 0x01) ? 255 : 0); 921 vmax = t[6]; 922 if (edid->revision >= 4) 923 vmax += ((t[4] & 0x02) ? 255 : 0); 924 vsync = drm_mode_vrefresh(mode); 925 926 return (vsync <= vmax && vsync >= vmin); 927 } 928 929 static u32 930 range_pixel_clock(struct edid *edid, u8 *t) 931 { 932 /* unspecified */ 933 if (t[9] == 0 || t[9] == 255) 934 return 0; 935 936 /* 1.4 with CVT support gives us real precision, yay */ 937 if (edid->revision >= 4 && t[10] == 0x04) 938 return (t[9] * 10000) - ((t[12] >> 2) * 250); 939 940 /* 1.3 is pathetic, so fuzz up a bit */ 941 return t[9] * 10000 + 5001; 942 } 943 944 static bool 945 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 946 struct detailed_timing *timing) 947 { 948 u32 max_clock; 949 u8 *t = (u8 *)timing; 950 951 if (!mode_in_hsync_range(mode, edid, t)) 952 return false; 953 954 if (!mode_in_vsync_range(mode, edid, t)) 955 return false; 956 957 if ((max_clock = range_pixel_clock(edid, t))) 958 if (mode->clock > max_clock) 959 return false; 960 961 /* 1.4 max horizontal check */ 962 if (edid->revision >= 4 && t[10] == 0x04) 963 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 964 return false; 965 966 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 967 return false; 968 969 return true; 970 } 971 972 /* 973 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 974 * need to account for them. 975 */ 976 static int 977 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 978 struct detailed_timing *timing) 979 { 980 int i, modes = 0; 981 struct drm_display_mode *newmode; 982 struct drm_device *dev = connector->dev; 983 984 for (i = 0; i < drm_num_dmt_modes; i++) { 985 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 986 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 987 if (newmode) { 988 drm_mode_probed_add(connector, newmode); 989 modes++; 990 } 991 } 992 } 993 994 return modes; 995 } 996 997 static void 998 do_inferred_modes(struct detailed_timing *timing, void *c) 999 { 1000 struct detailed_mode_closure *closure = c; 1001 struct detailed_non_pixel *data = &timing->data.other_data; 1002 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1003 1004 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1005 closure->modes += drm_gtf_modes_for_range(closure->connector, 1006 closure->edid, 1007 timing); 1008 } 1009 1010 static int 1011 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1012 { 1013 struct detailed_mode_closure closure = { 1014 connector, edid, 0, 0, 0 1015 }; 1016 1017 if (version_greater(edid, 1, 0)) 1018 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1019 &closure); 1020 1021 return closure.modes; 1022 } 1023 1024 static int 1025 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1026 { 1027 int i, j, m, modes = 0; 1028 struct drm_display_mode *mode; 1029 u8 *est = ((u8 *)timing) + 5; 1030 1031 for (i = 0; i < 6; i++) { 1032 for (j = 7; j > 0; j--) { 1033 m = (i * 8) + (7 - j); 1034 if (m >= ARRAY_SIZE(est3_modes)) 1035 break; 1036 if (est[i] & (1 << j)) { 1037 mode = drm_mode_find_dmt(connector->dev, 1038 est3_modes[m].w, 1039 est3_modes[m].h, 1040 est3_modes[m].r 1041 /*, est3_modes[m].rb */); 1042 if (mode) { 1043 drm_mode_probed_add(connector, mode); 1044 modes++; 1045 } 1046 } 1047 } 1048 } 1049 1050 return modes; 1051 } 1052 1053 static void 1054 do_established_modes(struct detailed_timing *timing, void *c) 1055 { 1056 struct detailed_mode_closure *closure = c; 1057 struct detailed_non_pixel *data = &timing->data.other_data; 1058 1059 if (data->type == EDID_DETAIL_EST_TIMINGS) 1060 closure->modes += drm_est3_modes(closure->connector, timing); 1061 } 1062 1063 /** 1064 * add_established_modes - get est. modes from EDID and add them 1065 * @edid: EDID block to scan 1066 * 1067 * Each EDID block contains a bitmap of the supported "established modes" list 1068 * (defined above). Tease them out and add them to the global modes list. 1069 */ 1070 static int 1071 add_established_modes(struct drm_connector *connector, struct edid *edid) 1072 { 1073 struct drm_device *dev = connector->dev; 1074 unsigned long est_bits = edid->established_timings.t1 | 1075 (edid->established_timings.t2 << 8) | 1076 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1077 int i, modes = 0; 1078 struct detailed_mode_closure closure = { 1079 connector, edid, 0, 0, 0 1080 }; 1081 1082 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1083 if (est_bits & (1<<i)) { 1084 struct drm_display_mode *newmode; 1085 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1086 if (newmode) { 1087 drm_mode_probed_add(connector, newmode); 1088 modes++; 1089 } 1090 } 1091 } 1092 1093 if (version_greater(edid, 1, 0)) 1094 drm_for_each_detailed_block((u8 *)edid, 1095 do_established_modes, &closure); 1096 1097 return modes + closure.modes; 1098 } 1099 1100 static void 1101 do_standard_modes(struct detailed_timing *timing, void *c) 1102 { 1103 struct detailed_mode_closure *closure = c; 1104 struct detailed_non_pixel *data = &timing->data.other_data; 1105 struct drm_connector *connector = closure->connector; 1106 struct edid *edid = closure->edid; 1107 1108 if (data->type == EDID_DETAIL_STD_MODES) { 1109 int i; 1110 for (i = 0; i < 6; i++) { 1111 struct std_timing *std; 1112 struct drm_display_mode *newmode; 1113 1114 std = &data->data.timings[i]; 1115 newmode = drm_mode_std(connector, edid, std, 1116 edid->revision); 1117 if (newmode) { 1118 drm_mode_probed_add(connector, newmode); 1119 closure->modes++; 1120 } 1121 } 1122 } 1123 } 1124 1125 /** 1126 * add_standard_modes - get std. modes from EDID and add them 1127 * @edid: EDID block to scan 1128 * 1129 * Standard modes can be calculated using the appropriate standard (DMT, 1130 * GTF or CVT. Grab them from @edid and add them to the list. 1131 */ 1132 static int 1133 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1134 { 1135 int i, modes = 0; 1136 struct detailed_mode_closure closure = { 1137 connector, edid, 0, 0, 0 1138 }; 1139 1140 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1141 struct drm_display_mode *newmode; 1142 1143 newmode = drm_mode_std(connector, edid, 1144 &edid->standard_timings[i], 1145 edid->revision); 1146 if (newmode) { 1147 drm_mode_probed_add(connector, newmode); 1148 modes++; 1149 } 1150 } 1151 1152 if (version_greater(edid, 1, 0)) 1153 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1154 &closure); 1155 1156 /* XXX should also look for standard codes in VTB blocks */ 1157 1158 return modes + closure.modes; 1159 } 1160 1161 static int drm_cvt_modes(struct drm_connector *connector, 1162 struct detailed_timing *timing) 1163 { 1164 int i, j, modes = 0; 1165 struct drm_display_mode *newmode; 1166 struct drm_device *dev = connector->dev; 1167 struct cvt_timing *cvt; 1168 const int rates[] = { 60, 85, 75, 60, 50 }; 1169 const u8 empty[3] = { 0, 0, 0 }; 1170 1171 for (i = 0; i < 4; i++) { 1172 int uninitialized_var(width), height; 1173 cvt = &(timing->data.other_data.data.cvt[i]); 1174 1175 if (!memcmp(cvt->code, empty, 3)) 1176 continue; 1177 1178 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1179 switch (cvt->code[1] & 0x0c) { 1180 case 0x00: 1181 width = height * 4 / 3; 1182 break; 1183 case 0x04: 1184 width = height * 16 / 9; 1185 break; 1186 case 0x08: 1187 width = height * 16 / 10; 1188 break; 1189 case 0x0c: 1190 width = height * 15 / 9; 1191 break; 1192 } 1193 1194 for (j = 1; j < 5; j++) { 1195 if (cvt->code[2] & (1 << j)) { 1196 newmode = drm_cvt_mode(dev, width, height, 1197 rates[j], j == 0, 1198 false, false); 1199 if (newmode) { 1200 drm_mode_probed_add(connector, newmode); 1201 modes++; 1202 } 1203 } 1204 } 1205 } 1206 1207 return modes; 1208 } 1209 1210 static void 1211 do_cvt_mode(struct detailed_timing *timing, void *c) 1212 { 1213 struct detailed_mode_closure *closure = c; 1214 struct detailed_non_pixel *data = &timing->data.other_data; 1215 1216 if (data->type == EDID_DETAIL_CVT_3BYTE) 1217 closure->modes += drm_cvt_modes(closure->connector, timing); 1218 } 1219 1220 static int 1221 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1222 { 1223 struct detailed_mode_closure closure = { 1224 connector, edid, 0, 0, 0 1225 }; 1226 1227 if (version_greater(edid, 1, 2)) 1228 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1229 1230 /* XXX should also look for CVT codes in VTB blocks */ 1231 1232 return closure.modes; 1233 } 1234 1235 static void 1236 do_detailed_mode(struct detailed_timing *timing, void *c) 1237 { 1238 struct detailed_mode_closure *closure = c; 1239 struct drm_display_mode *newmode; 1240 1241 if (timing->pixel_clock) { 1242 newmode = drm_mode_detailed(closure->connector->dev, 1243 closure->edid, timing, 1244 closure->quirks); 1245 if (!newmode) 1246 return; 1247 1248 if (closure->preferred) 1249 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1250 1251 drm_mode_probed_add(closure->connector, newmode); 1252 closure->modes++; 1253 closure->preferred = 0; 1254 } 1255 } 1256 1257 /* 1258 * add_detailed_modes - Add modes from detailed timings 1259 * @connector: attached connector 1260 * @edid: EDID block to scan 1261 * @quirks: quirks to apply 1262 */ 1263 static int 1264 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1265 u32 quirks) 1266 { 1267 struct detailed_mode_closure closure = { 1268 connector, 1269 edid, 1270 1, 1271 quirks, 1272 0 1273 }; 1274 1275 if (closure.preferred && !version_greater(edid, 1, 3)) 1276 closure.preferred = 1277 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1278 1279 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1280 1281 return closure.modes; 1282 } 1283 1284 #define HDMI_IDENTIFIER 0x000C03 1285 #define AUDIO_BLOCK 0x01 1286 #define VENDOR_BLOCK 0x03 1287 #define EDID_BASIC_AUDIO (1 << 6) 1288 1289 /** 1290 * Search EDID for CEA extension block. 1291 */ 1292 static u8 *drm_find_cea_extension(struct edid *edid) 1293 { 1294 u8 *edid_ext = NULL; 1295 int i; 1296 1297 /* No EDID or EDID extensions */ 1298 if (edid == NULL || edid->extensions == 0) 1299 return NULL; 1300 1301 /* Find CEA extension */ 1302 for (i = 0; i < edid->extensions; i++) { 1303 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1304 if (edid_ext[0] == CEA_EXT) 1305 break; 1306 } 1307 1308 if (i == edid->extensions) 1309 return NULL; 1310 1311 return edid_ext; 1312 } 1313 1314 /** 1315 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1316 * @edid: monitor EDID information 1317 * 1318 * Parse the CEA extension according to CEA-861-B. 1319 * Return true if HDMI, false if not or unknown. 1320 */ 1321 bool drm_detect_hdmi_monitor(struct edid *edid) 1322 { 1323 u8 *edid_ext; 1324 int i, hdmi_id; 1325 int start_offset, end_offset; 1326 bool is_hdmi = false; 1327 1328 edid_ext = drm_find_cea_extension(edid); 1329 if (!edid_ext) 1330 goto end; 1331 1332 /* Data block offset in CEA extension block */ 1333 start_offset = 4; 1334 end_offset = edid_ext[2]; 1335 1336 /* 1337 * Because HDMI identifier is in Vendor Specific Block, 1338 * search it from all data blocks of CEA extension. 1339 */ 1340 for (i = start_offset; i < end_offset; 1341 /* Increased by data block len */ 1342 i += ((edid_ext[i] & 0x1f) + 1)) { 1343 /* Find vendor specific block */ 1344 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1345 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1346 edid_ext[i + 3] << 16; 1347 /* Find HDMI identifier */ 1348 if (hdmi_id == HDMI_IDENTIFIER) 1349 is_hdmi = true; 1350 break; 1351 } 1352 } 1353 1354 end: 1355 return is_hdmi; 1356 } 1357 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1358 1359 /** 1360 * drm_detect_monitor_audio - check monitor audio capability 1361 * 1362 * Monitor should have CEA extension block. 1363 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1364 * audio' only. If there is any audio extension block and supported 1365 * audio format, assume at least 'basic audio' support, even if 'basic 1366 * audio' is not defined in EDID. 1367 * 1368 */ 1369 bool drm_detect_monitor_audio(struct edid *edid) 1370 { 1371 u8 *edid_ext; 1372 int i, j; 1373 bool has_audio = false; 1374 int start_offset, end_offset; 1375 1376 edid_ext = drm_find_cea_extension(edid); 1377 if (!edid_ext) 1378 goto end; 1379 1380 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1381 1382 if (has_audio) { 1383 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1384 goto end; 1385 } 1386 1387 /* Data block offset in CEA extension block */ 1388 start_offset = 4; 1389 end_offset = edid_ext[2]; 1390 1391 for (i = start_offset; i < end_offset; 1392 i += ((edid_ext[i] & 0x1f) + 1)) { 1393 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1394 has_audio = true; 1395 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1396 DRM_DEBUG_KMS("CEA audio format %d\n", 1397 (edid_ext[i + j] >> 3) & 0xf); 1398 goto end; 1399 } 1400 } 1401 end: 1402 return has_audio; 1403 } 1404 EXPORT_SYMBOL(drm_detect_monitor_audio); 1405 1406 /** 1407 * drm_add_edid_modes - add modes from EDID data, if available 1408 * @connector: connector we're probing 1409 * @edid: edid data 1410 * 1411 * Add the specified modes to the connector's mode list. 1412 * 1413 * Return number of modes added or 0 if we couldn't find any. 1414 */ 1415 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1416 { 1417 int num_modes = 0; 1418 u32 quirks; 1419 1420 if (edid == NULL) { 1421 return 0; 1422 } 1423 if (!drm_edid_is_valid(edid)) { 1424 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1425 drm_get_connector_name(connector)); 1426 return 0; 1427 } 1428 1429 quirks = edid_get_quirks(edid); 1430 1431 /* 1432 * EDID spec says modes should be preferred in this order: 1433 * - preferred detailed mode 1434 * - other detailed modes from base block 1435 * - detailed modes from extension blocks 1436 * - CVT 3-byte code modes 1437 * - standard timing codes 1438 * - established timing codes 1439 * - modes inferred from GTF or CVT range information 1440 * 1441 * We get this pretty much right. 1442 * 1443 * XXX order for additional mode types in extension blocks? 1444 */ 1445 num_modes += add_detailed_modes(connector, edid, quirks); 1446 num_modes += add_cvt_modes(connector, edid); 1447 num_modes += add_standard_modes(connector, edid); 1448 num_modes += add_established_modes(connector, edid); 1449 num_modes += add_inferred_modes(connector, edid); 1450 1451 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1452 edid_fixup_preferred(connector, quirks); 1453 1454 connector->display_info.width_mm = edid->width_cm * 10; 1455 connector->display_info.height_mm = edid->height_cm * 10; 1456 1457 return num_modes; 1458 } 1459 EXPORT_SYMBOL(drm_add_edid_modes); 1460 1461 /** 1462 * drm_add_modes_noedid - add modes for the connectors without EDID 1463 * @connector: connector we're probing 1464 * @hdisplay: the horizontal display limit 1465 * @vdisplay: the vertical display limit 1466 * 1467 * Add the specified modes to the connector's mode list. Only when the 1468 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1469 * 1470 * Return number of modes added or 0 if we couldn't find any. 1471 */ 1472 int drm_add_modes_noedid(struct drm_connector *connector, 1473 int hdisplay, int vdisplay) 1474 { 1475 int i, count, num_modes = 0; 1476 struct drm_display_mode *mode; 1477 struct drm_device *dev = connector->dev; 1478 1479 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1480 if (hdisplay < 0) 1481 hdisplay = 0; 1482 if (vdisplay < 0) 1483 vdisplay = 0; 1484 1485 for (i = 0; i < count; i++) { 1486 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1487 if (hdisplay && vdisplay) { 1488 /* 1489 * Only when two are valid, they will be used to check 1490 * whether the mode should be added to the mode list of 1491 * the connector. 1492 */ 1493 if (ptr->hdisplay > hdisplay || 1494 ptr->vdisplay > vdisplay) 1495 continue; 1496 } 1497 if (drm_mode_vrefresh(ptr) > 61) 1498 continue; 1499 mode = drm_mode_duplicate(dev, ptr); 1500 if (mode) { 1501 drm_mode_probed_add(connector, mode); 1502 num_modes++; 1503 } 1504 } 1505 return num_modes; 1506 } 1507 EXPORT_SYMBOL(drm_add_modes_noedid); 1508