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 printk(KERN_ERR "Raw EDID:\n"); 188 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH); 189 printk(KERN_ERR "\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 int ret, retries = 5; 234 235 /* The core i2c driver will automatically retry the transfer if the 236 * adapter reports EAGAIN. However, we find that bit-banging transfers 237 * are susceptible to errors under a heavily loaded machine and 238 * generate spurious NAKs and timeouts. Retrying the transfer 239 * of the individual block a few times seems to overcome this. 240 */ 241 do { 242 struct i2c_msg msgs[] = { 243 { 244 .addr = DDC_ADDR, 245 .flags = 0, 246 .len = 1, 247 .buf = &start, 248 }, { 249 .addr = DDC_ADDR, 250 .flags = I2C_M_RD, 251 .len = len, 252 .buf = buf, 253 } 254 }; 255 ret = i2c_transfer(adapter, msgs, 2); 256 } while (ret != 2 && --retries); 257 258 return ret == 2 ? 0 : -1; 259 } 260 261 static bool drm_edid_is_zero(u8 *in_edid, int length) 262 { 263 int i; 264 u32 *raw_edid = (u32 *)in_edid; 265 266 for (i = 0; i < length / 4; i++) 267 if (*(raw_edid + i) != 0) 268 return false; 269 return true; 270 } 271 272 static u8 * 273 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 274 { 275 int i, j = 0, valid_extensions = 0; 276 u8 *block, *new; 277 278 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 279 return NULL; 280 281 /* base block fetch */ 282 for (i = 0; i < 4; i++) { 283 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 284 goto out; 285 if (drm_edid_block_valid(block)) 286 break; 287 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 288 connector->null_edid_counter++; 289 goto carp; 290 } 291 } 292 if (i == 4) 293 goto carp; 294 295 /* if there's no extensions, we're done */ 296 if (block[0x7e] == 0) 297 return block; 298 299 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 300 if (!new) 301 goto out; 302 block = new; 303 304 for (j = 1; j <= block[0x7e]; j++) { 305 for (i = 0; i < 4; i++) { 306 if (drm_do_probe_ddc_edid(adapter, 307 block + (valid_extensions + 1) * EDID_LENGTH, 308 j, EDID_LENGTH)) 309 goto out; 310 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 311 valid_extensions++; 312 break; 313 } 314 } 315 if (i == 4) 316 dev_warn(connector->dev->dev, 317 "%s: Ignoring invalid EDID block %d.\n", 318 drm_get_connector_name(connector), j); 319 } 320 321 if (valid_extensions != block[0x7e]) { 322 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 323 block[0x7e] = valid_extensions; 324 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 325 if (!new) 326 goto out; 327 block = new; 328 } 329 330 return block; 331 332 carp: 333 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 334 drm_get_connector_name(connector), j); 335 336 out: 337 kfree(block); 338 return NULL; 339 } 340 341 /** 342 * Probe DDC presence. 343 * 344 * \param adapter : i2c device adaptor 345 * \return 1 on success 346 */ 347 static bool 348 drm_probe_ddc(struct i2c_adapter *adapter) 349 { 350 unsigned char out; 351 352 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 353 } 354 355 /** 356 * drm_get_edid - get EDID data, if available 357 * @connector: connector we're probing 358 * @adapter: i2c adapter to use for DDC 359 * 360 * Poke the given i2c channel to grab EDID data if possible. If found, 361 * attach it to the connector. 362 * 363 * Return edid data or NULL if we couldn't find any. 364 */ 365 struct edid *drm_get_edid(struct drm_connector *connector, 366 struct i2c_adapter *adapter) 367 { 368 struct edid *edid = NULL; 369 370 if (drm_probe_ddc(adapter)) 371 edid = (struct edid *)drm_do_get_edid(connector, adapter); 372 373 connector->display_info.raw_edid = (char *)edid; 374 375 return edid; 376 377 } 378 EXPORT_SYMBOL(drm_get_edid); 379 380 /*** EDID parsing ***/ 381 382 /** 383 * edid_vendor - match a string against EDID's obfuscated vendor field 384 * @edid: EDID to match 385 * @vendor: vendor string 386 * 387 * Returns true if @vendor is in @edid, false otherwise 388 */ 389 static bool edid_vendor(struct edid *edid, char *vendor) 390 { 391 char edid_vendor[3]; 392 393 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 394 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 395 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 396 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 397 398 return !strncmp(edid_vendor, vendor, 3); 399 } 400 401 /** 402 * edid_get_quirks - return quirk flags for a given EDID 403 * @edid: EDID to process 404 * 405 * This tells subsequent routines what fixes they need to apply. 406 */ 407 static u32 edid_get_quirks(struct edid *edid) 408 { 409 struct edid_quirk *quirk; 410 int i; 411 412 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 413 quirk = &edid_quirk_list[i]; 414 415 if (edid_vendor(edid, quirk->vendor) && 416 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 417 return quirk->quirks; 418 } 419 420 return 0; 421 } 422 423 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 424 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 425 426 /** 427 * edid_fixup_preferred - set preferred modes based on quirk list 428 * @connector: has mode list to fix up 429 * @quirks: quirks list 430 * 431 * Walk the mode list for @connector, clearing the preferred status 432 * on existing modes and setting it anew for the right mode ala @quirks. 433 */ 434 static void edid_fixup_preferred(struct drm_connector *connector, 435 u32 quirks) 436 { 437 struct drm_display_mode *t, *cur_mode, *preferred_mode; 438 int target_refresh = 0; 439 440 if (list_empty(&connector->probed_modes)) 441 return; 442 443 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 444 target_refresh = 60; 445 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 446 target_refresh = 75; 447 448 preferred_mode = list_first_entry(&connector->probed_modes, 449 struct drm_display_mode, head); 450 451 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 452 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 453 454 if (cur_mode == preferred_mode) 455 continue; 456 457 /* Largest mode is preferred */ 458 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 459 preferred_mode = cur_mode; 460 461 /* At a given size, try to get closest to target refresh */ 462 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 463 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 464 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 465 preferred_mode = cur_mode; 466 } 467 } 468 469 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 470 } 471 472 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 473 int hsize, int vsize, int fresh) 474 { 475 struct drm_display_mode *mode = NULL; 476 int i; 477 478 for (i = 0; i < drm_num_dmt_modes; i++) { 479 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 480 if (hsize == ptr->hdisplay && 481 vsize == ptr->vdisplay && 482 fresh == drm_mode_vrefresh(ptr)) { 483 /* get the expected default mode */ 484 mode = drm_mode_duplicate(dev, ptr); 485 break; 486 } 487 } 488 return mode; 489 } 490 EXPORT_SYMBOL(drm_mode_find_dmt); 491 492 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 493 494 static void 495 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 496 { 497 int i, n = 0; 498 u8 rev = ext[0x01], d = ext[0x02]; 499 u8 *det_base = ext + d; 500 501 switch (rev) { 502 case 0: 503 /* can't happen */ 504 return; 505 case 1: 506 /* have to infer how many blocks we have, check pixel clock */ 507 for (i = 0; i < 6; i++) 508 if (det_base[18*i] || det_base[18*i+1]) 509 n++; 510 break; 511 default: 512 /* explicit count */ 513 n = min(ext[0x03] & 0x0f, 6); 514 break; 515 } 516 517 for (i = 0; i < n; i++) 518 cb((struct detailed_timing *)(det_base + 18 * i), closure); 519 } 520 521 static void 522 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 523 { 524 unsigned int i, n = min((int)ext[0x02], 6); 525 u8 *det_base = ext + 5; 526 527 if (ext[0x01] != 1) 528 return; /* unknown version */ 529 530 for (i = 0; i < n; i++) 531 cb((struct detailed_timing *)(det_base + 18 * i), closure); 532 } 533 534 static void 535 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 536 { 537 int i; 538 struct edid *edid = (struct edid *)raw_edid; 539 540 if (edid == NULL) 541 return; 542 543 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 544 cb(&(edid->detailed_timings[i]), closure); 545 546 for (i = 1; i <= raw_edid[0x7e]; i++) { 547 u8 *ext = raw_edid + (i * EDID_LENGTH); 548 switch (*ext) { 549 case CEA_EXT: 550 cea_for_each_detailed_block(ext, cb, closure); 551 break; 552 case VTB_EXT: 553 vtb_for_each_detailed_block(ext, cb, closure); 554 break; 555 default: 556 break; 557 } 558 } 559 } 560 561 static void 562 is_rb(struct detailed_timing *t, void *data) 563 { 564 u8 *r = (u8 *)t; 565 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 566 if (r[15] & 0x10) 567 *(bool *)data = true; 568 } 569 570 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 571 static bool 572 drm_monitor_supports_rb(struct edid *edid) 573 { 574 if (edid->revision >= 4) { 575 bool ret; 576 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 577 return ret; 578 } 579 580 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 581 } 582 583 static void 584 find_gtf2(struct detailed_timing *t, void *data) 585 { 586 u8 *r = (u8 *)t; 587 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 588 *(u8 **)data = r; 589 } 590 591 /* Secondary GTF curve kicks in above some break frequency */ 592 static int 593 drm_gtf2_hbreak(struct edid *edid) 594 { 595 u8 *r = NULL; 596 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 597 return r ? (r[12] * 2) : 0; 598 } 599 600 static int 601 drm_gtf2_2c(struct edid *edid) 602 { 603 u8 *r = NULL; 604 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 605 return r ? r[13] : 0; 606 } 607 608 static int 609 drm_gtf2_m(struct edid *edid) 610 { 611 u8 *r = NULL; 612 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 613 return r ? (r[15] << 8) + r[14] : 0; 614 } 615 616 static int 617 drm_gtf2_k(struct edid *edid) 618 { 619 u8 *r = NULL; 620 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 621 return r ? r[16] : 0; 622 } 623 624 static int 625 drm_gtf2_2j(struct edid *edid) 626 { 627 u8 *r = NULL; 628 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 629 return r ? r[17] : 0; 630 } 631 632 /** 633 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 634 * @edid: EDID block to scan 635 */ 636 static int standard_timing_level(struct edid *edid) 637 { 638 if (edid->revision >= 2) { 639 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 640 return LEVEL_CVT; 641 if (drm_gtf2_hbreak(edid)) 642 return LEVEL_GTF2; 643 return LEVEL_GTF; 644 } 645 return LEVEL_DMT; 646 } 647 648 /* 649 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 650 * monitors fill with ascii space (0x20) instead. 651 */ 652 static int 653 bad_std_timing(u8 a, u8 b) 654 { 655 return (a == 0x00 && b == 0x00) || 656 (a == 0x01 && b == 0x01) || 657 (a == 0x20 && b == 0x20); 658 } 659 660 /** 661 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 662 * @t: standard timing params 663 * @timing_level: standard timing level 664 * 665 * Take the standard timing params (in this case width, aspect, and refresh) 666 * and convert them into a real mode using CVT/GTF/DMT. 667 */ 668 static struct drm_display_mode * 669 drm_mode_std(struct drm_connector *connector, struct edid *edid, 670 struct std_timing *t, int revision) 671 { 672 struct drm_device *dev = connector->dev; 673 struct drm_display_mode *m, *mode = NULL; 674 int hsize, vsize; 675 int vrefresh_rate; 676 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 677 >> EDID_TIMING_ASPECT_SHIFT; 678 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 679 >> EDID_TIMING_VFREQ_SHIFT; 680 int timing_level = standard_timing_level(edid); 681 682 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 683 return NULL; 684 685 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 686 hsize = t->hsize * 8 + 248; 687 /* vrefresh_rate = vfreq + 60 */ 688 vrefresh_rate = vfreq + 60; 689 /* the vdisplay is calculated based on the aspect ratio */ 690 if (aspect_ratio == 0) { 691 if (revision < 3) 692 vsize = hsize; 693 else 694 vsize = (hsize * 10) / 16; 695 } else if (aspect_ratio == 1) 696 vsize = (hsize * 3) / 4; 697 else if (aspect_ratio == 2) 698 vsize = (hsize * 4) / 5; 699 else 700 vsize = (hsize * 9) / 16; 701 702 /* HDTV hack, part 1 */ 703 if (vrefresh_rate == 60 && 704 ((hsize == 1360 && vsize == 765) || 705 (hsize == 1368 && vsize == 769))) { 706 hsize = 1366; 707 vsize = 768; 708 } 709 710 /* 711 * If this connector already has a mode for this size and refresh 712 * rate (because it came from detailed or CVT info), use that 713 * instead. This way we don't have to guess at interlace or 714 * reduced blanking. 715 */ 716 list_for_each_entry(m, &connector->probed_modes, head) 717 if (m->hdisplay == hsize && m->vdisplay == vsize && 718 drm_mode_vrefresh(m) == vrefresh_rate) 719 return NULL; 720 721 /* HDTV hack, part 2 */ 722 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 723 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 724 false); 725 mode->hdisplay = 1366; 726 mode->hsync_start = mode->hsync_start - 1; 727 mode->hsync_end = mode->hsync_end - 1; 728 return mode; 729 } 730 731 /* check whether it can be found in default mode table */ 732 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 733 if (mode) 734 return mode; 735 736 switch (timing_level) { 737 case LEVEL_DMT: 738 break; 739 case LEVEL_GTF: 740 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 741 break; 742 case LEVEL_GTF2: 743 /* 744 * This is potentially wrong if there's ever a monitor with 745 * more than one ranges section, each claiming a different 746 * secondary GTF curve. Please don't do that. 747 */ 748 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 749 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 750 kfree(mode); 751 mode = drm_gtf_mode_complex(dev, hsize, vsize, 752 vrefresh_rate, 0, 0, 753 drm_gtf2_m(edid), 754 drm_gtf2_2c(edid), 755 drm_gtf2_k(edid), 756 drm_gtf2_2j(edid)); 757 } 758 break; 759 case LEVEL_CVT: 760 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 761 false); 762 break; 763 } 764 return mode; 765 } 766 767 /* 768 * EDID is delightfully ambiguous about how interlaced modes are to be 769 * encoded. Our internal representation is of frame height, but some 770 * HDTV detailed timings are encoded as field height. 771 * 772 * The format list here is from CEA, in frame size. Technically we 773 * should be checking refresh rate too. Whatever. 774 */ 775 static void 776 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 777 struct detailed_pixel_timing *pt) 778 { 779 int i; 780 static const struct { 781 int w, h; 782 } cea_interlaced[] = { 783 { 1920, 1080 }, 784 { 720, 480 }, 785 { 1440, 480 }, 786 { 2880, 480 }, 787 { 720, 576 }, 788 { 1440, 576 }, 789 { 2880, 576 }, 790 }; 791 792 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 793 return; 794 795 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 796 if ((mode->hdisplay == cea_interlaced[i].w) && 797 (mode->vdisplay == cea_interlaced[i].h / 2)) { 798 mode->vdisplay *= 2; 799 mode->vsync_start *= 2; 800 mode->vsync_end *= 2; 801 mode->vtotal *= 2; 802 mode->vtotal |= 1; 803 } 804 } 805 806 mode->flags |= DRM_MODE_FLAG_INTERLACE; 807 } 808 809 /** 810 * drm_mode_detailed - create a new mode from an EDID detailed timing section 811 * @dev: DRM device (needed to create new mode) 812 * @edid: EDID block 813 * @timing: EDID detailed timing info 814 * @quirks: quirks to apply 815 * 816 * An EDID detailed timing block contains enough info for us to create and 817 * return a new struct drm_display_mode. 818 */ 819 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 820 struct edid *edid, 821 struct detailed_timing *timing, 822 u32 quirks) 823 { 824 struct drm_display_mode *mode; 825 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 826 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 827 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 828 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 829 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 830 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 831 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 832 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 833 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 834 835 /* ignore tiny modes */ 836 if (hactive < 64 || vactive < 64) 837 return NULL; 838 839 if (pt->misc & DRM_EDID_PT_STEREO) { 840 printk(KERN_WARNING "stereo mode not supported\n"); 841 return NULL; 842 } 843 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 844 printk(KERN_WARNING "composite sync not supported\n"); 845 } 846 847 /* it is incorrect if hsync/vsync width is zero */ 848 if (!hsync_pulse_width || !vsync_pulse_width) { 849 DRM_DEBUG_KMS("Incorrect Detailed timing. " 850 "Wrong Hsync/Vsync pulse width\n"); 851 return NULL; 852 } 853 mode = drm_mode_create(dev); 854 if (!mode) 855 return NULL; 856 857 mode->type = DRM_MODE_TYPE_DRIVER; 858 859 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 860 timing->pixel_clock = cpu_to_le16(1088); 861 862 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 863 864 mode->hdisplay = hactive; 865 mode->hsync_start = mode->hdisplay + hsync_offset; 866 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 867 mode->htotal = mode->hdisplay + hblank; 868 869 mode->vdisplay = vactive; 870 mode->vsync_start = mode->vdisplay + vsync_offset; 871 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 872 mode->vtotal = mode->vdisplay + vblank; 873 874 /* Some EDIDs have bogus h/vtotal values */ 875 if (mode->hsync_end > mode->htotal) 876 mode->htotal = mode->hsync_end + 1; 877 if (mode->vsync_end > mode->vtotal) 878 mode->vtotal = mode->vsync_end + 1; 879 880 drm_mode_do_interlace_quirk(mode, pt); 881 882 drm_mode_set_name(mode); 883 884 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 885 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 886 } 887 888 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 889 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 890 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 891 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 892 893 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 894 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 895 896 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 897 mode->width_mm *= 10; 898 mode->height_mm *= 10; 899 } 900 901 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 902 mode->width_mm = edid->width_cm * 10; 903 mode->height_mm = edid->height_cm * 10; 904 } 905 906 return mode; 907 } 908 909 static bool 910 mode_is_rb(const struct drm_display_mode *mode) 911 { 912 return (mode->htotal - mode->hdisplay == 160) && 913 (mode->hsync_end - mode->hdisplay == 80) && 914 (mode->hsync_end - mode->hsync_start == 32) && 915 (mode->vsync_start - mode->vdisplay == 3); 916 } 917 918 static bool 919 mode_in_hsync_range(const struct drm_display_mode *mode, 920 struct edid *edid, u8 *t) 921 { 922 int hsync, hmin, hmax; 923 924 hmin = t[7]; 925 if (edid->revision >= 4) 926 hmin += ((t[4] & 0x04) ? 255 : 0); 927 hmax = t[8]; 928 if (edid->revision >= 4) 929 hmax += ((t[4] & 0x08) ? 255 : 0); 930 hsync = drm_mode_hsync(mode); 931 932 return (hsync <= hmax && hsync >= hmin); 933 } 934 935 static bool 936 mode_in_vsync_range(const struct drm_display_mode *mode, 937 struct edid *edid, u8 *t) 938 { 939 int vsync, vmin, vmax; 940 941 vmin = t[5]; 942 if (edid->revision >= 4) 943 vmin += ((t[4] & 0x01) ? 255 : 0); 944 vmax = t[6]; 945 if (edid->revision >= 4) 946 vmax += ((t[4] & 0x02) ? 255 : 0); 947 vsync = drm_mode_vrefresh(mode); 948 949 return (vsync <= vmax && vsync >= vmin); 950 } 951 952 static u32 953 range_pixel_clock(struct edid *edid, u8 *t) 954 { 955 /* unspecified */ 956 if (t[9] == 0 || t[9] == 255) 957 return 0; 958 959 /* 1.4 with CVT support gives us real precision, yay */ 960 if (edid->revision >= 4 && t[10] == 0x04) 961 return (t[9] * 10000) - ((t[12] >> 2) * 250); 962 963 /* 1.3 is pathetic, so fuzz up a bit */ 964 return t[9] * 10000 + 5001; 965 } 966 967 static bool 968 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 969 struct detailed_timing *timing) 970 { 971 u32 max_clock; 972 u8 *t = (u8 *)timing; 973 974 if (!mode_in_hsync_range(mode, edid, t)) 975 return false; 976 977 if (!mode_in_vsync_range(mode, edid, t)) 978 return false; 979 980 if ((max_clock = range_pixel_clock(edid, t))) 981 if (mode->clock > max_clock) 982 return false; 983 984 /* 1.4 max horizontal check */ 985 if (edid->revision >= 4 && t[10] == 0x04) 986 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 987 return false; 988 989 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 990 return false; 991 992 return true; 993 } 994 995 /* 996 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 997 * need to account for them. 998 */ 999 static int 1000 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1001 struct detailed_timing *timing) 1002 { 1003 int i, modes = 0; 1004 struct drm_display_mode *newmode; 1005 struct drm_device *dev = connector->dev; 1006 1007 for (i = 0; i < drm_num_dmt_modes; i++) { 1008 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1009 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1010 if (newmode) { 1011 drm_mode_probed_add(connector, newmode); 1012 modes++; 1013 } 1014 } 1015 } 1016 1017 return modes; 1018 } 1019 1020 static void 1021 do_inferred_modes(struct detailed_timing *timing, void *c) 1022 { 1023 struct detailed_mode_closure *closure = c; 1024 struct detailed_non_pixel *data = &timing->data.other_data; 1025 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1026 1027 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1028 closure->modes += drm_gtf_modes_for_range(closure->connector, 1029 closure->edid, 1030 timing); 1031 } 1032 1033 static int 1034 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1035 { 1036 struct detailed_mode_closure closure = { 1037 connector, edid, 0, 0, 0 1038 }; 1039 1040 if (version_greater(edid, 1, 0)) 1041 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1042 &closure); 1043 1044 return closure.modes; 1045 } 1046 1047 static int 1048 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1049 { 1050 int i, j, m, modes = 0; 1051 struct drm_display_mode *mode; 1052 u8 *est = ((u8 *)timing) + 5; 1053 1054 for (i = 0; i < 6; i++) { 1055 for (j = 7; j > 0; j--) { 1056 m = (i * 8) + (7 - j); 1057 if (m >= ARRAY_SIZE(est3_modes)) 1058 break; 1059 if (est[i] & (1 << j)) { 1060 mode = drm_mode_find_dmt(connector->dev, 1061 est3_modes[m].w, 1062 est3_modes[m].h, 1063 est3_modes[m].r 1064 /*, est3_modes[m].rb */); 1065 if (mode) { 1066 drm_mode_probed_add(connector, mode); 1067 modes++; 1068 } 1069 } 1070 } 1071 } 1072 1073 return modes; 1074 } 1075 1076 static void 1077 do_established_modes(struct detailed_timing *timing, void *c) 1078 { 1079 struct detailed_mode_closure *closure = c; 1080 struct detailed_non_pixel *data = &timing->data.other_data; 1081 1082 if (data->type == EDID_DETAIL_EST_TIMINGS) 1083 closure->modes += drm_est3_modes(closure->connector, timing); 1084 } 1085 1086 /** 1087 * add_established_modes - get est. modes from EDID and add them 1088 * @edid: EDID block to scan 1089 * 1090 * Each EDID block contains a bitmap of the supported "established modes" list 1091 * (defined above). Tease them out and add them to the global modes list. 1092 */ 1093 static int 1094 add_established_modes(struct drm_connector *connector, struct edid *edid) 1095 { 1096 struct drm_device *dev = connector->dev; 1097 unsigned long est_bits = edid->established_timings.t1 | 1098 (edid->established_timings.t2 << 8) | 1099 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1100 int i, modes = 0; 1101 struct detailed_mode_closure closure = { 1102 connector, edid, 0, 0, 0 1103 }; 1104 1105 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1106 if (est_bits & (1<<i)) { 1107 struct drm_display_mode *newmode; 1108 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1109 if (newmode) { 1110 drm_mode_probed_add(connector, newmode); 1111 modes++; 1112 } 1113 } 1114 } 1115 1116 if (version_greater(edid, 1, 0)) 1117 drm_for_each_detailed_block((u8 *)edid, 1118 do_established_modes, &closure); 1119 1120 return modes + closure.modes; 1121 } 1122 1123 static void 1124 do_standard_modes(struct detailed_timing *timing, void *c) 1125 { 1126 struct detailed_mode_closure *closure = c; 1127 struct detailed_non_pixel *data = &timing->data.other_data; 1128 struct drm_connector *connector = closure->connector; 1129 struct edid *edid = closure->edid; 1130 1131 if (data->type == EDID_DETAIL_STD_MODES) { 1132 int i; 1133 for (i = 0; i < 6; i++) { 1134 struct std_timing *std; 1135 struct drm_display_mode *newmode; 1136 1137 std = &data->data.timings[i]; 1138 newmode = drm_mode_std(connector, edid, std, 1139 edid->revision); 1140 if (newmode) { 1141 drm_mode_probed_add(connector, newmode); 1142 closure->modes++; 1143 } 1144 } 1145 } 1146 } 1147 1148 /** 1149 * add_standard_modes - get std. modes from EDID and add them 1150 * @edid: EDID block to scan 1151 * 1152 * Standard modes can be calculated using the appropriate standard (DMT, 1153 * GTF or CVT. Grab them from @edid and add them to the list. 1154 */ 1155 static int 1156 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1157 { 1158 int i, modes = 0; 1159 struct detailed_mode_closure closure = { 1160 connector, edid, 0, 0, 0 1161 }; 1162 1163 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1164 struct drm_display_mode *newmode; 1165 1166 newmode = drm_mode_std(connector, edid, 1167 &edid->standard_timings[i], 1168 edid->revision); 1169 if (newmode) { 1170 drm_mode_probed_add(connector, newmode); 1171 modes++; 1172 } 1173 } 1174 1175 if (version_greater(edid, 1, 0)) 1176 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1177 &closure); 1178 1179 /* XXX should also look for standard codes in VTB blocks */ 1180 1181 return modes + closure.modes; 1182 } 1183 1184 static int drm_cvt_modes(struct drm_connector *connector, 1185 struct detailed_timing *timing) 1186 { 1187 int i, j, modes = 0; 1188 struct drm_display_mode *newmode; 1189 struct drm_device *dev = connector->dev; 1190 struct cvt_timing *cvt; 1191 const int rates[] = { 60, 85, 75, 60, 50 }; 1192 const u8 empty[3] = { 0, 0, 0 }; 1193 1194 for (i = 0; i < 4; i++) { 1195 int uninitialized_var(width), height; 1196 cvt = &(timing->data.other_data.data.cvt[i]); 1197 1198 if (!memcmp(cvt->code, empty, 3)) 1199 continue; 1200 1201 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1202 switch (cvt->code[1] & 0x0c) { 1203 case 0x00: 1204 width = height * 4 / 3; 1205 break; 1206 case 0x04: 1207 width = height * 16 / 9; 1208 break; 1209 case 0x08: 1210 width = height * 16 / 10; 1211 break; 1212 case 0x0c: 1213 width = height * 15 / 9; 1214 break; 1215 } 1216 1217 for (j = 1; j < 5; j++) { 1218 if (cvt->code[2] & (1 << j)) { 1219 newmode = drm_cvt_mode(dev, width, height, 1220 rates[j], j == 0, 1221 false, false); 1222 if (newmode) { 1223 drm_mode_probed_add(connector, newmode); 1224 modes++; 1225 } 1226 } 1227 } 1228 } 1229 1230 return modes; 1231 } 1232 1233 static void 1234 do_cvt_mode(struct detailed_timing *timing, void *c) 1235 { 1236 struct detailed_mode_closure *closure = c; 1237 struct detailed_non_pixel *data = &timing->data.other_data; 1238 1239 if (data->type == EDID_DETAIL_CVT_3BYTE) 1240 closure->modes += drm_cvt_modes(closure->connector, timing); 1241 } 1242 1243 static int 1244 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1245 { 1246 struct detailed_mode_closure closure = { 1247 connector, edid, 0, 0, 0 1248 }; 1249 1250 if (version_greater(edid, 1, 2)) 1251 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1252 1253 /* XXX should also look for CVT codes in VTB blocks */ 1254 1255 return closure.modes; 1256 } 1257 1258 static void 1259 do_detailed_mode(struct detailed_timing *timing, void *c) 1260 { 1261 struct detailed_mode_closure *closure = c; 1262 struct drm_display_mode *newmode; 1263 1264 if (timing->pixel_clock) { 1265 newmode = drm_mode_detailed(closure->connector->dev, 1266 closure->edid, timing, 1267 closure->quirks); 1268 if (!newmode) 1269 return; 1270 1271 if (closure->preferred) 1272 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1273 1274 drm_mode_probed_add(closure->connector, newmode); 1275 closure->modes++; 1276 closure->preferred = 0; 1277 } 1278 } 1279 1280 /* 1281 * add_detailed_modes - Add modes from detailed timings 1282 * @connector: attached connector 1283 * @edid: EDID block to scan 1284 * @quirks: quirks to apply 1285 */ 1286 static int 1287 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1288 u32 quirks) 1289 { 1290 struct detailed_mode_closure closure = { 1291 connector, 1292 edid, 1293 1, 1294 quirks, 1295 0 1296 }; 1297 1298 if (closure.preferred && !version_greater(edid, 1, 3)) 1299 closure.preferred = 1300 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1301 1302 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1303 1304 return closure.modes; 1305 } 1306 1307 #define HDMI_IDENTIFIER 0x000C03 1308 #define AUDIO_BLOCK 0x01 1309 #define VENDOR_BLOCK 0x03 1310 #define EDID_BASIC_AUDIO (1 << 6) 1311 1312 /** 1313 * Search EDID for CEA extension block. 1314 */ 1315 u8 *drm_find_cea_extension(struct edid *edid) 1316 { 1317 u8 *edid_ext = NULL; 1318 int i; 1319 1320 /* No EDID or EDID extensions */ 1321 if (edid == NULL || edid->extensions == 0) 1322 return NULL; 1323 1324 /* Find CEA extension */ 1325 for (i = 0; i < edid->extensions; i++) { 1326 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1327 if (edid_ext[0] == CEA_EXT) 1328 break; 1329 } 1330 1331 if (i == edid->extensions) 1332 return NULL; 1333 1334 return edid_ext; 1335 } 1336 EXPORT_SYMBOL(drm_find_cea_extension); 1337 1338 /** 1339 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1340 * @edid: monitor EDID information 1341 * 1342 * Parse the CEA extension according to CEA-861-B. 1343 * Return true if HDMI, false if not or unknown. 1344 */ 1345 bool drm_detect_hdmi_monitor(struct edid *edid) 1346 { 1347 u8 *edid_ext; 1348 int i, hdmi_id; 1349 int start_offset, end_offset; 1350 bool is_hdmi = false; 1351 1352 edid_ext = drm_find_cea_extension(edid); 1353 if (!edid_ext) 1354 goto end; 1355 1356 /* Data block offset in CEA extension block */ 1357 start_offset = 4; 1358 end_offset = edid_ext[2]; 1359 1360 /* 1361 * Because HDMI identifier is in Vendor Specific Block, 1362 * search it from all data blocks of CEA extension. 1363 */ 1364 for (i = start_offset; i < end_offset; 1365 /* Increased by data block len */ 1366 i += ((edid_ext[i] & 0x1f) + 1)) { 1367 /* Find vendor specific block */ 1368 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1369 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1370 edid_ext[i + 3] << 16; 1371 /* Find HDMI identifier */ 1372 if (hdmi_id == HDMI_IDENTIFIER) 1373 is_hdmi = true; 1374 break; 1375 } 1376 } 1377 1378 end: 1379 return is_hdmi; 1380 } 1381 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1382 1383 /** 1384 * drm_detect_monitor_audio - check monitor audio capability 1385 * 1386 * Monitor should have CEA extension block. 1387 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1388 * audio' only. If there is any audio extension block and supported 1389 * audio format, assume at least 'basic audio' support, even if 'basic 1390 * audio' is not defined in EDID. 1391 * 1392 */ 1393 bool drm_detect_monitor_audio(struct edid *edid) 1394 { 1395 u8 *edid_ext; 1396 int i, j; 1397 bool has_audio = false; 1398 int start_offset, end_offset; 1399 1400 edid_ext = drm_find_cea_extension(edid); 1401 if (!edid_ext) 1402 goto end; 1403 1404 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1405 1406 if (has_audio) { 1407 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1408 goto end; 1409 } 1410 1411 /* Data block offset in CEA extension block */ 1412 start_offset = 4; 1413 end_offset = edid_ext[2]; 1414 1415 for (i = start_offset; i < end_offset; 1416 i += ((edid_ext[i] & 0x1f) + 1)) { 1417 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1418 has_audio = true; 1419 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1420 DRM_DEBUG_KMS("CEA audio format %d\n", 1421 (edid_ext[i + j] >> 3) & 0xf); 1422 goto end; 1423 } 1424 } 1425 end: 1426 return has_audio; 1427 } 1428 EXPORT_SYMBOL(drm_detect_monitor_audio); 1429 1430 /** 1431 * drm_add_display_info - pull display info out if present 1432 * @edid: EDID data 1433 * @info: display info (attached to connector) 1434 * 1435 * Grab any available display info and stuff it into the drm_display_info 1436 * structure that's part of the connector. Useful for tracking bpp and 1437 * color spaces. 1438 */ 1439 static void drm_add_display_info(struct edid *edid, 1440 struct drm_display_info *info) 1441 { 1442 info->width_mm = edid->width_cm * 10; 1443 info->height_mm = edid->height_cm * 10; 1444 1445 /* driver figures it out in this case */ 1446 info->bpc = 0; 1447 info->color_formats = 0; 1448 1449 /* Only defined for 1.4 with digital displays */ 1450 if (edid->revision < 4) 1451 return; 1452 1453 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1454 return; 1455 1456 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1457 case DRM_EDID_DIGITAL_DEPTH_6: 1458 info->bpc = 6; 1459 break; 1460 case DRM_EDID_DIGITAL_DEPTH_8: 1461 info->bpc = 8; 1462 break; 1463 case DRM_EDID_DIGITAL_DEPTH_10: 1464 info->bpc = 10; 1465 break; 1466 case DRM_EDID_DIGITAL_DEPTH_12: 1467 info->bpc = 12; 1468 break; 1469 case DRM_EDID_DIGITAL_DEPTH_14: 1470 info->bpc = 14; 1471 break; 1472 case DRM_EDID_DIGITAL_DEPTH_16: 1473 info->bpc = 16; 1474 break; 1475 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1476 default: 1477 info->bpc = 0; 1478 break; 1479 } 1480 1481 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1482 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1483 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1484 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1485 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1486 } 1487 1488 /** 1489 * drm_add_edid_modes - add modes from EDID data, if available 1490 * @connector: connector we're probing 1491 * @edid: edid data 1492 * 1493 * Add the specified modes to the connector's mode list. 1494 * 1495 * Return number of modes added or 0 if we couldn't find any. 1496 */ 1497 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1498 { 1499 int num_modes = 0; 1500 u32 quirks; 1501 1502 if (edid == NULL) { 1503 return 0; 1504 } 1505 if (!drm_edid_is_valid(edid)) { 1506 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1507 drm_get_connector_name(connector)); 1508 return 0; 1509 } 1510 1511 quirks = edid_get_quirks(edid); 1512 1513 /* 1514 * EDID spec says modes should be preferred in this order: 1515 * - preferred detailed mode 1516 * - other detailed modes from base block 1517 * - detailed modes from extension blocks 1518 * - CVT 3-byte code modes 1519 * - standard timing codes 1520 * - established timing codes 1521 * - modes inferred from GTF or CVT range information 1522 * 1523 * We get this pretty much right. 1524 * 1525 * XXX order for additional mode types in extension blocks? 1526 */ 1527 num_modes += add_detailed_modes(connector, edid, quirks); 1528 num_modes += add_cvt_modes(connector, edid); 1529 num_modes += add_standard_modes(connector, edid); 1530 num_modes += add_established_modes(connector, edid); 1531 num_modes += add_inferred_modes(connector, edid); 1532 1533 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1534 edid_fixup_preferred(connector, quirks); 1535 1536 drm_add_display_info(edid, &connector->display_info); 1537 1538 return num_modes; 1539 } 1540 EXPORT_SYMBOL(drm_add_edid_modes); 1541 1542 /** 1543 * drm_add_modes_noedid - add modes for the connectors without EDID 1544 * @connector: connector we're probing 1545 * @hdisplay: the horizontal display limit 1546 * @vdisplay: the vertical display limit 1547 * 1548 * Add the specified modes to the connector's mode list. Only when the 1549 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1550 * 1551 * Return number of modes added or 0 if we couldn't find any. 1552 */ 1553 int drm_add_modes_noedid(struct drm_connector *connector, 1554 int hdisplay, int vdisplay) 1555 { 1556 int i, count, num_modes = 0; 1557 struct drm_display_mode *mode; 1558 struct drm_device *dev = connector->dev; 1559 1560 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1561 if (hdisplay < 0) 1562 hdisplay = 0; 1563 if (vdisplay < 0) 1564 vdisplay = 0; 1565 1566 for (i = 0; i < count; i++) { 1567 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1568 if (hdisplay && vdisplay) { 1569 /* 1570 * Only when two are valid, they will be used to check 1571 * whether the mode should be added to the mode list of 1572 * the connector. 1573 */ 1574 if (ptr->hdisplay > hdisplay || 1575 ptr->vdisplay > vdisplay) 1576 continue; 1577 } 1578 if (drm_mode_vrefresh(ptr) > 61) 1579 continue; 1580 mode = drm_mode_duplicate(dev, ptr); 1581 if (mode) { 1582 drm_mode_probed_add(connector, mode); 1583 num_modes++; 1584 } 1585 } 1586 return num_modes; 1587 } 1588 EXPORT_SYMBOL(drm_add_modes_noedid); 1589