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