1 /* 2 * Copyright (c) 2006 Luc Verhaegen (quirks list) 3 * Copyright (c) 2007-2008 Intel Corporation 4 * Jesse Barnes <jesse.barnes@intel.com> 5 * Copyright 2010 Red Hat, Inc. 6 * 7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from 8 * FB layer. 9 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com> 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sub license, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the 19 * next paragraph) shall be included in all copies or substantial portions 20 * of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 28 * DEALINGS IN THE SOFTWARE. 29 */ 30 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/i2c.h> 33 #include <linux/export.h> 34 #include "drmP.h" 35 #include "drm_edid.h" 36 #include "drm_edid_modes.h" 37 38 #define version_greater(edid, maj, min) \ 39 (((edid)->version > (maj)) || \ 40 ((edid)->version == (maj) && (edid)->revision > (min))) 41 42 #define EDID_EST_TIMINGS 16 43 #define EDID_STD_TIMINGS 8 44 #define EDID_DETAILED_TIMINGS 4 45 46 /* 47 * EDID blocks out in the wild have a variety of bugs, try to collect 48 * them here (note that userspace may work around broken monitors first, 49 * but fixes should make their way here so that the kernel "just works" 50 * on as many displays as possible). 51 */ 52 53 /* First detailed mode wrong, use largest 60Hz mode */ 54 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 55 /* Reported 135MHz pixel clock is too high, needs adjustment */ 56 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 57 /* Prefer the largest mode at 75 Hz */ 58 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 59 /* Detail timing is in cm not mm */ 60 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 61 /* Detailed timing descriptors have bogus size values, so just take the 62 * maximum size and use that. 63 */ 64 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 65 /* Monitor forgot to set the first detailed is preferred bit. */ 66 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 67 /* use +hsync +vsync for detailed mode */ 68 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 69 70 struct detailed_mode_closure { 71 struct drm_connector *connector; 72 struct edid *edid; 73 bool preferred; 74 u32 quirks; 75 int modes; 76 }; 77 78 #define LEVEL_DMT 0 79 #define LEVEL_GTF 1 80 #define LEVEL_GTF2 2 81 #define LEVEL_CVT 3 82 83 static struct edid_quirk { 84 char *vendor; 85 int product_id; 86 u32 quirks; 87 } edid_quirk_list[] = { 88 /* Acer AL1706 */ 89 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 90 /* Acer F51 */ 91 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 92 /* Unknown Acer */ 93 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 94 95 /* Belinea 10 15 55 */ 96 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 97 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 98 99 /* Envision Peripherals, Inc. EN-7100e */ 100 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 101 /* Envision EN2028 */ 102 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 103 104 /* Funai Electronics PM36B */ 105 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 106 EDID_QUIRK_DETAILED_IN_CM }, 107 108 /* LG Philips LCD LP154W01-A5 */ 109 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 110 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 111 112 /* Philips 107p5 CRT */ 113 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 114 115 /* Proview AY765C */ 116 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 117 118 /* Samsung SyncMaster 205BW. Note: irony */ 119 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 120 /* Samsung SyncMaster 22[5-6]BW */ 121 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 122 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 123 }; 124 125 /*** DDC fetch and block validation ***/ 126 127 static const u8 edid_header[] = { 128 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 129 }; 130 131 /* 132 * Sanity check the header of the base EDID block. Return 8 if the header 133 * is perfect, down to 0 if it's totally wrong. 134 */ 135 int drm_edid_header_is_valid(const u8 *raw_edid) 136 { 137 int i, score = 0; 138 139 for (i = 0; i < sizeof(edid_header); i++) 140 if (raw_edid[i] == edid_header[i]) 141 score++; 142 143 return score; 144 } 145 EXPORT_SYMBOL(drm_edid_header_is_valid); 146 147 148 /* 149 * Sanity check the EDID block (base or extension). Return 0 if the block 150 * doesn't check out, or 1 if it's valid. 151 */ 152 bool drm_edid_block_valid(u8 *raw_edid) 153 { 154 int i; 155 u8 csum = 0; 156 struct edid *edid = (struct edid *)raw_edid; 157 158 if (raw_edid[0] == 0x00) { 159 int score = drm_edid_header_is_valid(raw_edid); 160 if (score == 8) ; 161 else if (score >= 6) { 162 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 163 memcpy(raw_edid, edid_header, sizeof(edid_header)); 164 } else { 165 goto bad; 166 } 167 } 168 169 for (i = 0; i < EDID_LENGTH; i++) 170 csum += raw_edid[i]; 171 if (csum) { 172 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 173 174 /* allow CEA to slide through, switches mangle this */ 175 if (raw_edid[0] != 0x02) 176 goto bad; 177 } 178 179 /* per-block-type checks */ 180 switch (raw_edid[0]) { 181 case 0: /* base */ 182 if (edid->version != 1) { 183 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 184 goto bad; 185 } 186 187 if (edid->revision > 4) 188 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 189 break; 190 191 default: 192 break; 193 } 194 195 return 1; 196 197 bad: 198 if (raw_edid) { 199 printk(KERN_ERR "Raw EDID:\n"); 200 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1, 201 raw_edid, EDID_LENGTH, false); 202 } 203 return 0; 204 } 205 EXPORT_SYMBOL(drm_edid_block_valid); 206 207 /** 208 * drm_edid_is_valid - sanity check EDID data 209 * @edid: EDID data 210 * 211 * Sanity-check an entire EDID record (including extensions) 212 */ 213 bool drm_edid_is_valid(struct edid *edid) 214 { 215 int i; 216 u8 *raw = (u8 *)edid; 217 218 if (!edid) 219 return false; 220 221 for (i = 0; i <= edid->extensions; i++) 222 if (!drm_edid_block_valid(raw + i * EDID_LENGTH)) 223 return false; 224 225 return true; 226 } 227 EXPORT_SYMBOL(drm_edid_is_valid); 228 229 #define DDC_SEGMENT_ADDR 0x30 230 /** 231 * Get EDID information via I2C. 232 * 233 * \param adapter : i2c device adaptor 234 * \param buf : EDID data buffer to be filled 235 * \param len : EDID data buffer length 236 * \return 0 on success or -1 on failure. 237 * 238 * Try to fetch EDID information by calling i2c driver function. 239 */ 240 static int 241 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, 242 int block, int len) 243 { 244 unsigned char start = block * EDID_LENGTH; 245 int ret, retries = 5; 246 247 /* The core i2c driver will automatically retry the transfer if the 248 * adapter reports EAGAIN. However, we find that bit-banging transfers 249 * are susceptible to errors under a heavily loaded machine and 250 * generate spurious NAKs and timeouts. Retrying the transfer 251 * of the individual block a few times seems to overcome this. 252 */ 253 do { 254 struct i2c_msg msgs[] = { 255 { 256 .addr = DDC_ADDR, 257 .flags = 0, 258 .len = 1, 259 .buf = &start, 260 }, { 261 .addr = DDC_ADDR, 262 .flags = I2C_M_RD, 263 .len = len, 264 .buf = buf, 265 } 266 }; 267 ret = i2c_transfer(adapter, msgs, 2); 268 if (ret == -ENXIO) { 269 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n", 270 adapter->name); 271 break; 272 } 273 } while (ret != 2 && --retries); 274 275 return ret == 2 ? 0 : -1; 276 } 277 278 static bool drm_edid_is_zero(u8 *in_edid, int length) 279 { 280 int i; 281 u32 *raw_edid = (u32 *)in_edid; 282 283 for (i = 0; i < length / 4; i++) 284 if (*(raw_edid + i) != 0) 285 return false; 286 return true; 287 } 288 289 static u8 * 290 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 291 { 292 int i, j = 0, valid_extensions = 0; 293 u8 *block, *new; 294 295 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 296 return NULL; 297 298 /* base block fetch */ 299 for (i = 0; i < 4; i++) { 300 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 301 goto out; 302 if (drm_edid_block_valid(block)) 303 break; 304 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 305 connector->null_edid_counter++; 306 goto carp; 307 } 308 } 309 if (i == 4) 310 goto carp; 311 312 /* if there's no extensions, we're done */ 313 if (block[0x7e] == 0) 314 return block; 315 316 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 317 if (!new) 318 goto out; 319 block = new; 320 321 for (j = 1; j <= block[0x7e]; j++) { 322 for (i = 0; i < 4; i++) { 323 if (drm_do_probe_ddc_edid(adapter, 324 block + (valid_extensions + 1) * EDID_LENGTH, 325 j, EDID_LENGTH)) 326 goto out; 327 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { 328 valid_extensions++; 329 break; 330 } 331 } 332 if (i == 4) 333 dev_warn(connector->dev->dev, 334 "%s: Ignoring invalid EDID block %d.\n", 335 drm_get_connector_name(connector), j); 336 } 337 338 if (valid_extensions != block[0x7e]) { 339 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 340 block[0x7e] = valid_extensions; 341 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 342 if (!new) 343 goto out; 344 block = new; 345 } 346 347 return block; 348 349 carp: 350 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 351 drm_get_connector_name(connector), j); 352 353 out: 354 kfree(block); 355 return NULL; 356 } 357 358 /** 359 * Probe DDC presence. 360 * 361 * \param adapter : i2c device adaptor 362 * \return 1 on success 363 */ 364 static bool 365 drm_probe_ddc(struct i2c_adapter *adapter) 366 { 367 unsigned char out; 368 369 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 370 } 371 372 /** 373 * drm_get_edid - get EDID data, if available 374 * @connector: connector we're probing 375 * @adapter: i2c adapter to use for DDC 376 * 377 * Poke the given i2c channel to grab EDID data if possible. If found, 378 * attach it to the connector. 379 * 380 * Return edid data or NULL if we couldn't find any. 381 */ 382 struct edid *drm_get_edid(struct drm_connector *connector, 383 struct i2c_adapter *adapter) 384 { 385 struct edid *edid = NULL; 386 387 if (drm_probe_ddc(adapter)) 388 edid = (struct edid *)drm_do_get_edid(connector, adapter); 389 390 connector->display_info.raw_edid = (char *)edid; 391 392 return edid; 393 394 } 395 EXPORT_SYMBOL(drm_get_edid); 396 397 /*** EDID parsing ***/ 398 399 /** 400 * edid_vendor - match a string against EDID's obfuscated vendor field 401 * @edid: EDID to match 402 * @vendor: vendor string 403 * 404 * Returns true if @vendor is in @edid, false otherwise 405 */ 406 static bool edid_vendor(struct edid *edid, char *vendor) 407 { 408 char edid_vendor[3]; 409 410 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 411 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 412 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 413 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 414 415 return !strncmp(edid_vendor, vendor, 3); 416 } 417 418 /** 419 * edid_get_quirks - return quirk flags for a given EDID 420 * @edid: EDID to process 421 * 422 * This tells subsequent routines what fixes they need to apply. 423 */ 424 static u32 edid_get_quirks(struct edid *edid) 425 { 426 struct edid_quirk *quirk; 427 int i; 428 429 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 430 quirk = &edid_quirk_list[i]; 431 432 if (edid_vendor(edid, quirk->vendor) && 433 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 434 return quirk->quirks; 435 } 436 437 return 0; 438 } 439 440 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 441 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 442 443 /** 444 * edid_fixup_preferred - set preferred modes based on quirk list 445 * @connector: has mode list to fix up 446 * @quirks: quirks list 447 * 448 * Walk the mode list for @connector, clearing the preferred status 449 * on existing modes and setting it anew for the right mode ala @quirks. 450 */ 451 static void edid_fixup_preferred(struct drm_connector *connector, 452 u32 quirks) 453 { 454 struct drm_display_mode *t, *cur_mode, *preferred_mode; 455 int target_refresh = 0; 456 457 if (list_empty(&connector->probed_modes)) 458 return; 459 460 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 461 target_refresh = 60; 462 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 463 target_refresh = 75; 464 465 preferred_mode = list_first_entry(&connector->probed_modes, 466 struct drm_display_mode, head); 467 468 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 469 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 470 471 if (cur_mode == preferred_mode) 472 continue; 473 474 /* Largest mode is preferred */ 475 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 476 preferred_mode = cur_mode; 477 478 /* At a given size, try to get closest to target refresh */ 479 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 480 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 481 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 482 preferred_mode = cur_mode; 483 } 484 } 485 486 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 487 } 488 489 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 490 int hsize, int vsize, int fresh) 491 { 492 struct drm_display_mode *mode = NULL; 493 int i; 494 495 for (i = 0; i < drm_num_dmt_modes; i++) { 496 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 497 if (hsize == ptr->hdisplay && 498 vsize == ptr->vdisplay && 499 fresh == drm_mode_vrefresh(ptr)) { 500 /* get the expected default mode */ 501 mode = drm_mode_duplicate(dev, ptr); 502 break; 503 } 504 } 505 return mode; 506 } 507 EXPORT_SYMBOL(drm_mode_find_dmt); 508 509 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 510 511 static void 512 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 513 { 514 int i, n = 0; 515 u8 d = ext[0x02]; 516 u8 *det_base = ext + d; 517 518 n = (127 - d) / 18; 519 for (i = 0; i < n; i++) 520 cb((struct detailed_timing *)(det_base + 18 * i), closure); 521 } 522 523 static void 524 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 525 { 526 unsigned int i, n = min((int)ext[0x02], 6); 527 u8 *det_base = ext + 5; 528 529 if (ext[0x01] != 1) 530 return; /* unknown version */ 531 532 for (i = 0; i < n; i++) 533 cb((struct detailed_timing *)(det_base + 18 * i), closure); 534 } 535 536 static void 537 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 538 { 539 int i; 540 struct edid *edid = (struct edid *)raw_edid; 541 542 if (edid == NULL) 543 return; 544 545 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 546 cb(&(edid->detailed_timings[i]), closure); 547 548 for (i = 1; i <= raw_edid[0x7e]; i++) { 549 u8 *ext = raw_edid + (i * EDID_LENGTH); 550 switch (*ext) { 551 case CEA_EXT: 552 cea_for_each_detailed_block(ext, cb, closure); 553 break; 554 case VTB_EXT: 555 vtb_for_each_detailed_block(ext, cb, closure); 556 break; 557 default: 558 break; 559 } 560 } 561 } 562 563 static void 564 is_rb(struct detailed_timing *t, void *data) 565 { 566 u8 *r = (u8 *)t; 567 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 568 if (r[15] & 0x10) 569 *(bool *)data = true; 570 } 571 572 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 573 static bool 574 drm_monitor_supports_rb(struct edid *edid) 575 { 576 if (edid->revision >= 4) { 577 bool ret; 578 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 579 return ret; 580 } 581 582 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 583 } 584 585 static void 586 find_gtf2(struct detailed_timing *t, void *data) 587 { 588 u8 *r = (u8 *)t; 589 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 590 *(u8 **)data = r; 591 } 592 593 /* Secondary GTF curve kicks in above some break frequency */ 594 static int 595 drm_gtf2_hbreak(struct edid *edid) 596 { 597 u8 *r = NULL; 598 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 599 return r ? (r[12] * 2) : 0; 600 } 601 602 static int 603 drm_gtf2_2c(struct edid *edid) 604 { 605 u8 *r = NULL; 606 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 607 return r ? r[13] : 0; 608 } 609 610 static int 611 drm_gtf2_m(struct edid *edid) 612 { 613 u8 *r = NULL; 614 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 615 return r ? (r[15] << 8) + r[14] : 0; 616 } 617 618 static int 619 drm_gtf2_k(struct edid *edid) 620 { 621 u8 *r = NULL; 622 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 623 return r ? r[16] : 0; 624 } 625 626 static int 627 drm_gtf2_2j(struct edid *edid) 628 { 629 u8 *r = NULL; 630 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 631 return r ? r[17] : 0; 632 } 633 634 /** 635 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 636 * @edid: EDID block to scan 637 */ 638 static int standard_timing_level(struct edid *edid) 639 { 640 if (edid->revision >= 2) { 641 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 642 return LEVEL_CVT; 643 if (drm_gtf2_hbreak(edid)) 644 return LEVEL_GTF2; 645 return LEVEL_GTF; 646 } 647 return LEVEL_DMT; 648 } 649 650 /* 651 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 652 * monitors fill with ascii space (0x20) instead. 653 */ 654 static int 655 bad_std_timing(u8 a, u8 b) 656 { 657 return (a == 0x00 && b == 0x00) || 658 (a == 0x01 && b == 0x01) || 659 (a == 0x20 && b == 0x20); 660 } 661 662 /** 663 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 664 * @t: standard timing params 665 * @timing_level: standard timing level 666 * 667 * Take the standard timing params (in this case width, aspect, and refresh) 668 * and convert them into a real mode using CVT/GTF/DMT. 669 */ 670 static struct drm_display_mode * 671 drm_mode_std(struct drm_connector *connector, struct edid *edid, 672 struct std_timing *t, int revision) 673 { 674 struct drm_device *dev = connector->dev; 675 struct drm_display_mode *m, *mode = NULL; 676 int hsize, vsize; 677 int vrefresh_rate; 678 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 679 >> EDID_TIMING_ASPECT_SHIFT; 680 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 681 >> EDID_TIMING_VFREQ_SHIFT; 682 int timing_level = standard_timing_level(edid); 683 684 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 685 return NULL; 686 687 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 688 hsize = t->hsize * 8 + 248; 689 /* vrefresh_rate = vfreq + 60 */ 690 vrefresh_rate = vfreq + 60; 691 /* the vdisplay is calculated based on the aspect ratio */ 692 if (aspect_ratio == 0) { 693 if (revision < 3) 694 vsize = hsize; 695 else 696 vsize = (hsize * 10) / 16; 697 } else if (aspect_ratio == 1) 698 vsize = (hsize * 3) / 4; 699 else if (aspect_ratio == 2) 700 vsize = (hsize * 4) / 5; 701 else 702 vsize = (hsize * 9) / 16; 703 704 /* HDTV hack, part 1 */ 705 if (vrefresh_rate == 60 && 706 ((hsize == 1360 && vsize == 765) || 707 (hsize == 1368 && vsize == 769))) { 708 hsize = 1366; 709 vsize = 768; 710 } 711 712 /* 713 * If this connector already has a mode for this size and refresh 714 * rate (because it came from detailed or CVT info), use that 715 * instead. This way we don't have to guess at interlace or 716 * reduced blanking. 717 */ 718 list_for_each_entry(m, &connector->probed_modes, head) 719 if (m->hdisplay == hsize && m->vdisplay == vsize && 720 drm_mode_vrefresh(m) == vrefresh_rate) 721 return NULL; 722 723 /* HDTV hack, part 2 */ 724 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 725 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 726 false); 727 mode->hdisplay = 1366; 728 mode->hsync_start = mode->hsync_start - 1; 729 mode->hsync_end = mode->hsync_end - 1; 730 return mode; 731 } 732 733 /* check whether it can be found in default mode table */ 734 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); 735 if (mode) 736 return mode; 737 738 switch (timing_level) { 739 case LEVEL_DMT: 740 break; 741 case LEVEL_GTF: 742 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 743 break; 744 case LEVEL_GTF2: 745 /* 746 * This is potentially wrong if there's ever a monitor with 747 * more than one ranges section, each claiming a different 748 * secondary GTF curve. Please don't do that. 749 */ 750 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 751 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 752 drm_mode_destroy(dev, mode); 753 mode = drm_gtf_mode_complex(dev, hsize, vsize, 754 vrefresh_rate, 0, 0, 755 drm_gtf2_m(edid), 756 drm_gtf2_2c(edid), 757 drm_gtf2_k(edid), 758 drm_gtf2_2j(edid)); 759 } 760 break; 761 case LEVEL_CVT: 762 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 763 false); 764 break; 765 } 766 return mode; 767 } 768 769 /* 770 * EDID is delightfully ambiguous about how interlaced modes are to be 771 * encoded. Our internal representation is of frame height, but some 772 * HDTV detailed timings are encoded as field height. 773 * 774 * The format list here is from CEA, in frame size. Technically we 775 * should be checking refresh rate too. Whatever. 776 */ 777 static void 778 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 779 struct detailed_pixel_timing *pt) 780 { 781 int i; 782 static const struct { 783 int w, h; 784 } cea_interlaced[] = { 785 { 1920, 1080 }, 786 { 720, 480 }, 787 { 1440, 480 }, 788 { 2880, 480 }, 789 { 720, 576 }, 790 { 1440, 576 }, 791 { 2880, 576 }, 792 }; 793 794 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 795 return; 796 797 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 798 if ((mode->hdisplay == cea_interlaced[i].w) && 799 (mode->vdisplay == cea_interlaced[i].h / 2)) { 800 mode->vdisplay *= 2; 801 mode->vsync_start *= 2; 802 mode->vsync_end *= 2; 803 mode->vtotal *= 2; 804 mode->vtotal |= 1; 805 } 806 } 807 808 mode->flags |= DRM_MODE_FLAG_INTERLACE; 809 } 810 811 /** 812 * drm_mode_detailed - create a new mode from an EDID detailed timing section 813 * @dev: DRM device (needed to create new mode) 814 * @edid: EDID block 815 * @timing: EDID detailed timing info 816 * @quirks: quirks to apply 817 * 818 * An EDID detailed timing block contains enough info for us to create and 819 * return a new struct drm_display_mode. 820 */ 821 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 822 struct edid *edid, 823 struct detailed_timing *timing, 824 u32 quirks) 825 { 826 struct drm_display_mode *mode; 827 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 828 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 829 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 830 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 831 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 832 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 833 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 834 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 835 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 836 837 /* ignore tiny modes */ 838 if (hactive < 64 || vactive < 64) 839 return NULL; 840 841 if (pt->misc & DRM_EDID_PT_STEREO) { 842 printk(KERN_WARNING "stereo mode not supported\n"); 843 return NULL; 844 } 845 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 846 printk(KERN_WARNING "composite sync not supported\n"); 847 } 848 849 /* it is incorrect if hsync/vsync width is zero */ 850 if (!hsync_pulse_width || !vsync_pulse_width) { 851 DRM_DEBUG_KMS("Incorrect Detailed timing. " 852 "Wrong Hsync/Vsync pulse width\n"); 853 return NULL; 854 } 855 mode = drm_mode_create(dev); 856 if (!mode) 857 return NULL; 858 859 mode->type = DRM_MODE_TYPE_DRIVER; 860 861 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 862 timing->pixel_clock = cpu_to_le16(1088); 863 864 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 865 866 mode->hdisplay = hactive; 867 mode->hsync_start = mode->hdisplay + hsync_offset; 868 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 869 mode->htotal = mode->hdisplay + hblank; 870 871 mode->vdisplay = vactive; 872 mode->vsync_start = mode->vdisplay + vsync_offset; 873 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 874 mode->vtotal = mode->vdisplay + vblank; 875 876 /* Some EDIDs have bogus h/vtotal values */ 877 if (mode->hsync_end > mode->htotal) 878 mode->htotal = mode->hsync_end + 1; 879 if (mode->vsync_end > mode->vtotal) 880 mode->vtotal = mode->vsync_end + 1; 881 882 drm_mode_do_interlace_quirk(mode, pt); 883 884 drm_mode_set_name(mode); 885 886 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 887 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 888 } 889 890 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 891 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 892 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 893 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 894 895 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 896 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 897 898 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 899 mode->width_mm *= 10; 900 mode->height_mm *= 10; 901 } 902 903 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 904 mode->width_mm = edid->width_cm * 10; 905 mode->height_mm = edid->height_cm * 10; 906 } 907 908 return mode; 909 } 910 911 static bool 912 mode_is_rb(const struct drm_display_mode *mode) 913 { 914 return (mode->htotal - mode->hdisplay == 160) && 915 (mode->hsync_end - mode->hdisplay == 80) && 916 (mode->hsync_end - mode->hsync_start == 32) && 917 (mode->vsync_start - mode->vdisplay == 3); 918 } 919 920 static bool 921 mode_in_hsync_range(const struct drm_display_mode *mode, 922 struct edid *edid, u8 *t) 923 { 924 int hsync, hmin, hmax; 925 926 hmin = t[7]; 927 if (edid->revision >= 4) 928 hmin += ((t[4] & 0x04) ? 255 : 0); 929 hmax = t[8]; 930 if (edid->revision >= 4) 931 hmax += ((t[4] & 0x08) ? 255 : 0); 932 hsync = drm_mode_hsync(mode); 933 934 return (hsync <= hmax && hsync >= hmin); 935 } 936 937 static bool 938 mode_in_vsync_range(const struct drm_display_mode *mode, 939 struct edid *edid, u8 *t) 940 { 941 int vsync, vmin, vmax; 942 943 vmin = t[5]; 944 if (edid->revision >= 4) 945 vmin += ((t[4] & 0x01) ? 255 : 0); 946 vmax = t[6]; 947 if (edid->revision >= 4) 948 vmax += ((t[4] & 0x02) ? 255 : 0); 949 vsync = drm_mode_vrefresh(mode); 950 951 return (vsync <= vmax && vsync >= vmin); 952 } 953 954 static u32 955 range_pixel_clock(struct edid *edid, u8 *t) 956 { 957 /* unspecified */ 958 if (t[9] == 0 || t[9] == 255) 959 return 0; 960 961 /* 1.4 with CVT support gives us real precision, yay */ 962 if (edid->revision >= 4 && t[10] == 0x04) 963 return (t[9] * 10000) - ((t[12] >> 2) * 250); 964 965 /* 1.3 is pathetic, so fuzz up a bit */ 966 return t[9] * 10000 + 5001; 967 } 968 969 static bool 970 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 971 struct detailed_timing *timing) 972 { 973 u32 max_clock; 974 u8 *t = (u8 *)timing; 975 976 if (!mode_in_hsync_range(mode, edid, t)) 977 return false; 978 979 if (!mode_in_vsync_range(mode, edid, t)) 980 return false; 981 982 if ((max_clock = range_pixel_clock(edid, t))) 983 if (mode->clock > max_clock) 984 return false; 985 986 /* 1.4 max horizontal check */ 987 if (edid->revision >= 4 && t[10] == 0x04) 988 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 989 return false; 990 991 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 992 return false; 993 994 return true; 995 } 996 997 /* 998 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will 999 * need to account for them. 1000 */ 1001 static int 1002 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1003 struct detailed_timing *timing) 1004 { 1005 int i, modes = 0; 1006 struct drm_display_mode *newmode; 1007 struct drm_device *dev = connector->dev; 1008 1009 for (i = 0; i < drm_num_dmt_modes; i++) { 1010 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1011 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1012 if (newmode) { 1013 drm_mode_probed_add(connector, newmode); 1014 modes++; 1015 } 1016 } 1017 } 1018 1019 return modes; 1020 } 1021 1022 static void 1023 do_inferred_modes(struct detailed_timing *timing, void *c) 1024 { 1025 struct detailed_mode_closure *closure = c; 1026 struct detailed_non_pixel *data = &timing->data.other_data; 1027 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); 1028 1029 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) 1030 closure->modes += drm_gtf_modes_for_range(closure->connector, 1031 closure->edid, 1032 timing); 1033 } 1034 1035 static int 1036 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1037 { 1038 struct detailed_mode_closure closure = { 1039 connector, edid, 0, 0, 0 1040 }; 1041 1042 if (version_greater(edid, 1, 0)) 1043 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1044 &closure); 1045 1046 return closure.modes; 1047 } 1048 1049 static int 1050 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1051 { 1052 int i, j, m, modes = 0; 1053 struct drm_display_mode *mode; 1054 u8 *est = ((u8 *)timing) + 5; 1055 1056 for (i = 0; i < 6; i++) { 1057 for (j = 7; j > 0; j--) { 1058 m = (i * 8) + (7 - j); 1059 if (m >= ARRAY_SIZE(est3_modes)) 1060 break; 1061 if (est[i] & (1 << j)) { 1062 mode = drm_mode_find_dmt(connector->dev, 1063 est3_modes[m].w, 1064 est3_modes[m].h, 1065 est3_modes[m].r 1066 /*, est3_modes[m].rb */); 1067 if (mode) { 1068 drm_mode_probed_add(connector, mode); 1069 modes++; 1070 } 1071 } 1072 } 1073 } 1074 1075 return modes; 1076 } 1077 1078 static void 1079 do_established_modes(struct detailed_timing *timing, void *c) 1080 { 1081 struct detailed_mode_closure *closure = c; 1082 struct detailed_non_pixel *data = &timing->data.other_data; 1083 1084 if (data->type == EDID_DETAIL_EST_TIMINGS) 1085 closure->modes += drm_est3_modes(closure->connector, timing); 1086 } 1087 1088 /** 1089 * add_established_modes - get est. modes from EDID and add them 1090 * @edid: EDID block to scan 1091 * 1092 * Each EDID block contains a bitmap of the supported "established modes" list 1093 * (defined above). Tease them out and add them to the global modes list. 1094 */ 1095 static int 1096 add_established_modes(struct drm_connector *connector, struct edid *edid) 1097 { 1098 struct drm_device *dev = connector->dev; 1099 unsigned long est_bits = edid->established_timings.t1 | 1100 (edid->established_timings.t2 << 8) | 1101 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1102 int i, modes = 0; 1103 struct detailed_mode_closure closure = { 1104 connector, edid, 0, 0, 0 1105 }; 1106 1107 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1108 if (est_bits & (1<<i)) { 1109 struct drm_display_mode *newmode; 1110 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1111 if (newmode) { 1112 drm_mode_probed_add(connector, newmode); 1113 modes++; 1114 } 1115 } 1116 } 1117 1118 if (version_greater(edid, 1, 0)) 1119 drm_for_each_detailed_block((u8 *)edid, 1120 do_established_modes, &closure); 1121 1122 return modes + closure.modes; 1123 } 1124 1125 static void 1126 do_standard_modes(struct detailed_timing *timing, void *c) 1127 { 1128 struct detailed_mode_closure *closure = c; 1129 struct detailed_non_pixel *data = &timing->data.other_data; 1130 struct drm_connector *connector = closure->connector; 1131 struct edid *edid = closure->edid; 1132 1133 if (data->type == EDID_DETAIL_STD_MODES) { 1134 int i; 1135 for (i = 0; i < 6; i++) { 1136 struct std_timing *std; 1137 struct drm_display_mode *newmode; 1138 1139 std = &data->data.timings[i]; 1140 newmode = drm_mode_std(connector, edid, std, 1141 edid->revision); 1142 if (newmode) { 1143 drm_mode_probed_add(connector, newmode); 1144 closure->modes++; 1145 } 1146 } 1147 } 1148 } 1149 1150 /** 1151 * add_standard_modes - get std. modes from EDID and add them 1152 * @edid: EDID block to scan 1153 * 1154 * Standard modes can be calculated using the appropriate standard (DMT, 1155 * GTF or CVT. Grab them from @edid and add them to the list. 1156 */ 1157 static int 1158 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1159 { 1160 int i, modes = 0; 1161 struct detailed_mode_closure closure = { 1162 connector, edid, 0, 0, 0 1163 }; 1164 1165 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1166 struct drm_display_mode *newmode; 1167 1168 newmode = drm_mode_std(connector, edid, 1169 &edid->standard_timings[i], 1170 edid->revision); 1171 if (newmode) { 1172 drm_mode_probed_add(connector, newmode); 1173 modes++; 1174 } 1175 } 1176 1177 if (version_greater(edid, 1, 0)) 1178 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1179 &closure); 1180 1181 /* XXX should also look for standard codes in VTB blocks */ 1182 1183 return modes + closure.modes; 1184 } 1185 1186 static int drm_cvt_modes(struct drm_connector *connector, 1187 struct detailed_timing *timing) 1188 { 1189 int i, j, modes = 0; 1190 struct drm_display_mode *newmode; 1191 struct drm_device *dev = connector->dev; 1192 struct cvt_timing *cvt; 1193 const int rates[] = { 60, 85, 75, 60, 50 }; 1194 const u8 empty[3] = { 0, 0, 0 }; 1195 1196 for (i = 0; i < 4; i++) { 1197 int uninitialized_var(width), height; 1198 cvt = &(timing->data.other_data.data.cvt[i]); 1199 1200 if (!memcmp(cvt->code, empty, 3)) 1201 continue; 1202 1203 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1204 switch (cvt->code[1] & 0x0c) { 1205 case 0x00: 1206 width = height * 4 / 3; 1207 break; 1208 case 0x04: 1209 width = height * 16 / 9; 1210 break; 1211 case 0x08: 1212 width = height * 16 / 10; 1213 break; 1214 case 0x0c: 1215 width = height * 15 / 9; 1216 break; 1217 } 1218 1219 for (j = 1; j < 5; j++) { 1220 if (cvt->code[2] & (1 << j)) { 1221 newmode = drm_cvt_mode(dev, width, height, 1222 rates[j], j == 0, 1223 false, false); 1224 if (newmode) { 1225 drm_mode_probed_add(connector, newmode); 1226 modes++; 1227 } 1228 } 1229 } 1230 } 1231 1232 return modes; 1233 } 1234 1235 static void 1236 do_cvt_mode(struct detailed_timing *timing, void *c) 1237 { 1238 struct detailed_mode_closure *closure = c; 1239 struct detailed_non_pixel *data = &timing->data.other_data; 1240 1241 if (data->type == EDID_DETAIL_CVT_3BYTE) 1242 closure->modes += drm_cvt_modes(closure->connector, timing); 1243 } 1244 1245 static int 1246 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1247 { 1248 struct detailed_mode_closure closure = { 1249 connector, edid, 0, 0, 0 1250 }; 1251 1252 if (version_greater(edid, 1, 2)) 1253 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1254 1255 /* XXX should also look for CVT codes in VTB blocks */ 1256 1257 return closure.modes; 1258 } 1259 1260 static void 1261 do_detailed_mode(struct detailed_timing *timing, void *c) 1262 { 1263 struct detailed_mode_closure *closure = c; 1264 struct drm_display_mode *newmode; 1265 1266 if (timing->pixel_clock) { 1267 newmode = drm_mode_detailed(closure->connector->dev, 1268 closure->edid, timing, 1269 closure->quirks); 1270 if (!newmode) 1271 return; 1272 1273 if (closure->preferred) 1274 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1275 1276 drm_mode_probed_add(closure->connector, newmode); 1277 closure->modes++; 1278 closure->preferred = 0; 1279 } 1280 } 1281 1282 /* 1283 * add_detailed_modes - Add modes from detailed timings 1284 * @connector: attached connector 1285 * @edid: EDID block to scan 1286 * @quirks: quirks to apply 1287 */ 1288 static int 1289 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1290 u32 quirks) 1291 { 1292 struct detailed_mode_closure closure = { 1293 connector, 1294 edid, 1295 1, 1296 quirks, 1297 0 1298 }; 1299 1300 if (closure.preferred && !version_greater(edid, 1, 3)) 1301 closure.preferred = 1302 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1303 1304 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1305 1306 return closure.modes; 1307 } 1308 1309 #define HDMI_IDENTIFIER 0x000C03 1310 #define AUDIO_BLOCK 0x01 1311 #define VIDEO_BLOCK 0x02 1312 #define VENDOR_BLOCK 0x03 1313 #define SPEAKER_BLOCK 0x04 1314 #define EDID_BASIC_AUDIO (1 << 6) 1315 1316 /** 1317 * Search EDID for CEA extension block. 1318 */ 1319 u8 *drm_find_cea_extension(struct edid *edid) 1320 { 1321 u8 *edid_ext = NULL; 1322 int i; 1323 1324 /* No EDID or EDID extensions */ 1325 if (edid == NULL || edid->extensions == 0) 1326 return NULL; 1327 1328 /* Find CEA extension */ 1329 for (i = 0; i < edid->extensions; i++) { 1330 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1331 if (edid_ext[0] == CEA_EXT) 1332 break; 1333 } 1334 1335 if (i == edid->extensions) 1336 return NULL; 1337 1338 return edid_ext; 1339 } 1340 EXPORT_SYMBOL(drm_find_cea_extension); 1341 1342 static int 1343 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1344 { 1345 struct drm_device *dev = connector->dev; 1346 u8 * mode, cea_mode; 1347 int modes = 0; 1348 1349 for (mode = db; mode < db + len; mode++) { 1350 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1351 if (cea_mode < drm_num_cea_modes) { 1352 struct drm_display_mode *newmode; 1353 newmode = drm_mode_duplicate(dev, 1354 &edid_cea_modes[cea_mode]); 1355 if (newmode) { 1356 drm_mode_probed_add(connector, newmode); 1357 modes++; 1358 } 1359 } 1360 } 1361 1362 return modes; 1363 } 1364 1365 static int 1366 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1367 { 1368 u8 * cea = drm_find_cea_extension(edid); 1369 u8 * db, dbl; 1370 int modes = 0; 1371 1372 if (cea && cea[1] >= 3) { 1373 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1374 dbl = db[0] & 0x1f; 1375 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK) 1376 modes += do_cea_modes (connector, db+1, dbl); 1377 } 1378 } 1379 1380 return modes; 1381 } 1382 1383 static void 1384 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1385 { 1386 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1387 1388 connector->dvi_dual = db[6] & 1; 1389 connector->max_tmds_clock = db[7] * 5; 1390 1391 connector->latency_present[0] = db[8] >> 7; 1392 connector->latency_present[1] = (db[8] >> 6) & 1; 1393 connector->video_latency[0] = db[9]; 1394 connector->audio_latency[0] = db[10]; 1395 connector->video_latency[1] = db[11]; 1396 connector->audio_latency[1] = db[12]; 1397 1398 DRM_LOG_KMS("HDMI: DVI dual %d, " 1399 "max TMDS clock %d, " 1400 "latency present %d %d, " 1401 "video latency %d %d, " 1402 "audio latency %d %d\n", 1403 connector->dvi_dual, 1404 connector->max_tmds_clock, 1405 (int) connector->latency_present[0], 1406 (int) connector->latency_present[1], 1407 connector->video_latency[0], 1408 connector->video_latency[1], 1409 connector->audio_latency[0], 1410 connector->audio_latency[1]); 1411 } 1412 1413 static void 1414 monitor_name(struct detailed_timing *t, void *data) 1415 { 1416 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1417 *(u8 **)data = t->data.other_data.data.str.str; 1418 } 1419 1420 /** 1421 * drm_edid_to_eld - build ELD from EDID 1422 * @connector: connector corresponding to the HDMI/DP sink 1423 * @edid: EDID to parse 1424 * 1425 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1426 * Some ELD fields are left to the graphics driver caller: 1427 * - Conn_Type 1428 * - HDCP 1429 * - Port_ID 1430 */ 1431 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1432 { 1433 uint8_t *eld = connector->eld; 1434 u8 *cea; 1435 u8 *name; 1436 u8 *db; 1437 int sad_count = 0; 1438 int mnl; 1439 int dbl; 1440 1441 memset(eld, 0, sizeof(connector->eld)); 1442 1443 cea = drm_find_cea_extension(edid); 1444 if (!cea) { 1445 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1446 return; 1447 } 1448 1449 name = NULL; 1450 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1451 for (mnl = 0; name && mnl < 13; mnl++) { 1452 if (name[mnl] == 0x0a) 1453 break; 1454 eld[20 + mnl] = name[mnl]; 1455 } 1456 eld[4] = (cea[1] << 5) | mnl; 1457 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1458 1459 eld[0] = 2 << 3; /* ELD version: 2 */ 1460 1461 eld[16] = edid->mfg_id[0]; 1462 eld[17] = edid->mfg_id[1]; 1463 eld[18] = edid->prod_code[0]; 1464 eld[19] = edid->prod_code[1]; 1465 1466 if (cea[1] >= 3) 1467 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1468 dbl = db[0] & 0x1f; 1469 1470 switch ((db[0] & 0xe0) >> 5) { 1471 case AUDIO_BLOCK: 1472 /* Audio Data Block, contains SADs */ 1473 sad_count = dbl / 3; 1474 memcpy(eld + 20 + mnl, &db[1], dbl); 1475 break; 1476 case SPEAKER_BLOCK: 1477 /* Speaker Allocation Data Block */ 1478 eld[7] = db[1]; 1479 break; 1480 case VENDOR_BLOCK: 1481 /* HDMI Vendor-Specific Data Block */ 1482 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1483 parse_hdmi_vsdb(connector, db); 1484 break; 1485 default: 1486 break; 1487 } 1488 } 1489 eld[5] |= sad_count << 4; 1490 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1491 1492 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1493 } 1494 EXPORT_SYMBOL(drm_edid_to_eld); 1495 1496 /** 1497 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1498 * @connector: connector associated with the HDMI/DP sink 1499 * @mode: the display mode 1500 */ 1501 int drm_av_sync_delay(struct drm_connector *connector, 1502 struct drm_display_mode *mode) 1503 { 1504 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1505 int a, v; 1506 1507 if (!connector->latency_present[0]) 1508 return 0; 1509 if (!connector->latency_present[1]) 1510 i = 0; 1511 1512 a = connector->audio_latency[i]; 1513 v = connector->video_latency[i]; 1514 1515 /* 1516 * HDMI/DP sink doesn't support audio or video? 1517 */ 1518 if (a == 255 || v == 255) 1519 return 0; 1520 1521 /* 1522 * Convert raw EDID values to millisecond. 1523 * Treat unknown latency as 0ms. 1524 */ 1525 if (a) 1526 a = min(2 * (a - 1), 500); 1527 if (v) 1528 v = min(2 * (v - 1), 500); 1529 1530 return max(v - a, 0); 1531 } 1532 EXPORT_SYMBOL(drm_av_sync_delay); 1533 1534 /** 1535 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1536 * @encoder: the encoder just changed display mode 1537 * @mode: the adjusted display mode 1538 * 1539 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1540 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1541 */ 1542 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1543 struct drm_display_mode *mode) 1544 { 1545 struct drm_connector *connector; 1546 struct drm_device *dev = encoder->dev; 1547 1548 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1549 if (connector->encoder == encoder && connector->eld[0]) 1550 return connector; 1551 1552 return NULL; 1553 } 1554 EXPORT_SYMBOL(drm_select_eld); 1555 1556 /** 1557 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1558 * @edid: monitor EDID information 1559 * 1560 * Parse the CEA extension according to CEA-861-B. 1561 * Return true if HDMI, false if not or unknown. 1562 */ 1563 bool drm_detect_hdmi_monitor(struct edid *edid) 1564 { 1565 u8 *edid_ext; 1566 int i, hdmi_id; 1567 int start_offset, end_offset; 1568 bool is_hdmi = false; 1569 1570 edid_ext = drm_find_cea_extension(edid); 1571 if (!edid_ext) 1572 goto end; 1573 1574 /* Data block offset in CEA extension block */ 1575 start_offset = 4; 1576 end_offset = edid_ext[2]; 1577 1578 /* 1579 * Because HDMI identifier is in Vendor Specific Block, 1580 * search it from all data blocks of CEA extension. 1581 */ 1582 for (i = start_offset; i < end_offset; 1583 /* Increased by data block len */ 1584 i += ((edid_ext[i] & 0x1f) + 1)) { 1585 /* Find vendor specific block */ 1586 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1587 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1588 edid_ext[i + 3] << 16; 1589 /* Find HDMI identifier */ 1590 if (hdmi_id == HDMI_IDENTIFIER) 1591 is_hdmi = true; 1592 break; 1593 } 1594 } 1595 1596 end: 1597 return is_hdmi; 1598 } 1599 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1600 1601 /** 1602 * drm_detect_monitor_audio - check monitor audio capability 1603 * 1604 * Monitor should have CEA extension block. 1605 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1606 * audio' only. If there is any audio extension block and supported 1607 * audio format, assume at least 'basic audio' support, even if 'basic 1608 * audio' is not defined in EDID. 1609 * 1610 */ 1611 bool drm_detect_monitor_audio(struct edid *edid) 1612 { 1613 u8 *edid_ext; 1614 int i, j; 1615 bool has_audio = false; 1616 int start_offset, end_offset; 1617 1618 edid_ext = drm_find_cea_extension(edid); 1619 if (!edid_ext) 1620 goto end; 1621 1622 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1623 1624 if (has_audio) { 1625 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1626 goto end; 1627 } 1628 1629 /* Data block offset in CEA extension block */ 1630 start_offset = 4; 1631 end_offset = edid_ext[2]; 1632 1633 for (i = start_offset; i < end_offset; 1634 i += ((edid_ext[i] & 0x1f) + 1)) { 1635 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1636 has_audio = true; 1637 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1638 DRM_DEBUG_KMS("CEA audio format %d\n", 1639 (edid_ext[i + j] >> 3) & 0xf); 1640 goto end; 1641 } 1642 } 1643 end: 1644 return has_audio; 1645 } 1646 EXPORT_SYMBOL(drm_detect_monitor_audio); 1647 1648 /** 1649 * drm_add_display_info - pull display info out if present 1650 * @edid: EDID data 1651 * @info: display info (attached to connector) 1652 * 1653 * Grab any available display info and stuff it into the drm_display_info 1654 * structure that's part of the connector. Useful for tracking bpp and 1655 * color spaces. 1656 */ 1657 static void drm_add_display_info(struct edid *edid, 1658 struct drm_display_info *info) 1659 { 1660 u8 *edid_ext; 1661 1662 info->width_mm = edid->width_cm * 10; 1663 info->height_mm = edid->height_cm * 10; 1664 1665 /* driver figures it out in this case */ 1666 info->bpc = 0; 1667 info->color_formats = 0; 1668 1669 /* Only defined for 1.4 with digital displays */ 1670 if (edid->revision < 4) 1671 return; 1672 1673 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1674 return; 1675 1676 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1677 case DRM_EDID_DIGITAL_DEPTH_6: 1678 info->bpc = 6; 1679 break; 1680 case DRM_EDID_DIGITAL_DEPTH_8: 1681 info->bpc = 8; 1682 break; 1683 case DRM_EDID_DIGITAL_DEPTH_10: 1684 info->bpc = 10; 1685 break; 1686 case DRM_EDID_DIGITAL_DEPTH_12: 1687 info->bpc = 12; 1688 break; 1689 case DRM_EDID_DIGITAL_DEPTH_14: 1690 info->bpc = 14; 1691 break; 1692 case DRM_EDID_DIGITAL_DEPTH_16: 1693 info->bpc = 16; 1694 break; 1695 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1696 default: 1697 info->bpc = 0; 1698 break; 1699 } 1700 1701 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1702 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) 1703 info->color_formats = DRM_COLOR_FORMAT_YCRCB444; 1704 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) 1705 info->color_formats = DRM_COLOR_FORMAT_YCRCB422; 1706 1707 /* Get data from CEA blocks if present */ 1708 edid_ext = drm_find_cea_extension(edid); 1709 if (!edid_ext) 1710 return; 1711 1712 info->cea_rev = edid_ext[1]; 1713 } 1714 1715 /** 1716 * drm_add_edid_modes - add modes from EDID data, if available 1717 * @connector: connector we're probing 1718 * @edid: edid data 1719 * 1720 * Add the specified modes to the connector's mode list. 1721 * 1722 * Return number of modes added or 0 if we couldn't find any. 1723 */ 1724 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1725 { 1726 int num_modes = 0; 1727 u32 quirks; 1728 1729 if (edid == NULL) { 1730 return 0; 1731 } 1732 if (!drm_edid_is_valid(edid)) { 1733 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1734 drm_get_connector_name(connector)); 1735 return 0; 1736 } 1737 1738 quirks = edid_get_quirks(edid); 1739 1740 /* 1741 * EDID spec says modes should be preferred in this order: 1742 * - preferred detailed mode 1743 * - other detailed modes from base block 1744 * - detailed modes from extension blocks 1745 * - CVT 3-byte code modes 1746 * - standard timing codes 1747 * - established timing codes 1748 * - modes inferred from GTF or CVT range information 1749 * 1750 * We get this pretty much right. 1751 * 1752 * XXX order for additional mode types in extension blocks? 1753 */ 1754 num_modes += add_detailed_modes(connector, edid, quirks); 1755 num_modes += add_cvt_modes(connector, edid); 1756 num_modes += add_standard_modes(connector, edid); 1757 num_modes += add_established_modes(connector, edid); 1758 num_modes += add_inferred_modes(connector, edid); 1759 num_modes += add_cea_modes(connector, edid); 1760 1761 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1762 edid_fixup_preferred(connector, quirks); 1763 1764 drm_add_display_info(edid, &connector->display_info); 1765 1766 return num_modes; 1767 } 1768 EXPORT_SYMBOL(drm_add_edid_modes); 1769 1770 /** 1771 * drm_add_modes_noedid - add modes for the connectors without EDID 1772 * @connector: connector we're probing 1773 * @hdisplay: the horizontal display limit 1774 * @vdisplay: the vertical display limit 1775 * 1776 * Add the specified modes to the connector's mode list. Only when the 1777 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1778 * 1779 * Return number of modes added or 0 if we couldn't find any. 1780 */ 1781 int drm_add_modes_noedid(struct drm_connector *connector, 1782 int hdisplay, int vdisplay) 1783 { 1784 int i, count, num_modes = 0; 1785 struct drm_display_mode *mode; 1786 struct drm_device *dev = connector->dev; 1787 1788 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1789 if (hdisplay < 0) 1790 hdisplay = 0; 1791 if (vdisplay < 0) 1792 vdisplay = 0; 1793 1794 for (i = 0; i < count; i++) { 1795 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1796 if (hdisplay && vdisplay) { 1797 /* 1798 * Only when two are valid, they will be used to check 1799 * whether the mode should be added to the mode list of 1800 * the connector. 1801 */ 1802 if (ptr->hdisplay > hdisplay || 1803 ptr->vdisplay > vdisplay) 1804 continue; 1805 } 1806 if (drm_mode_vrefresh(ptr) > 61) 1807 continue; 1808 mode = drm_mode_duplicate(dev, ptr); 1809 if (mode) { 1810 drm_mode_probed_add(connector, mode); 1811 num_modes++; 1812 } 1813 } 1814 return num_modes; 1815 } 1816 EXPORT_SYMBOL(drm_add_modes_noedid); 1817