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[4]; 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, int block) 153 { 154 int i; 155 u8 csum = 0; 156 struct edid *edid = (struct edid *)raw_edid; 157 158 if (block == 0) { 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, i)) 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, 0)) 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, j)) { 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 static bool 490 mode_is_rb(const struct drm_display_mode *mode) 491 { 492 return (mode->htotal - mode->hdisplay == 160) && 493 (mode->hsync_end - mode->hdisplay == 80) && 494 (mode->hsync_end - mode->hsync_start == 32) && 495 (mode->vsync_start - mode->vdisplay == 3); 496 } 497 498 /* 499 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 500 * @dev: Device to duplicate against 501 * @hsize: Mode width 502 * @vsize: Mode height 503 * @fresh: Mode refresh rate 504 * @rb: Mode reduced-blanking-ness 505 * 506 * Walk the DMT mode list looking for a match for the given parameters. 507 * Return a newly allocated copy of the mode, or NULL if not found. 508 */ 509 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 510 int hsize, int vsize, int fresh, 511 bool rb) 512 { 513 int i; 514 515 for (i = 0; i < drm_num_dmt_modes; i++) { 516 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 517 if (hsize != ptr->hdisplay) 518 continue; 519 if (vsize != ptr->vdisplay) 520 continue; 521 if (fresh != drm_mode_vrefresh(ptr)) 522 continue; 523 if (rb != mode_is_rb(ptr)) 524 continue; 525 526 return drm_mode_duplicate(dev, ptr); 527 } 528 529 return NULL; 530 } 531 EXPORT_SYMBOL(drm_mode_find_dmt); 532 533 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 534 535 static void 536 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 537 { 538 int i, n = 0; 539 u8 d = ext[0x02]; 540 u8 *det_base = ext + d; 541 542 n = (127 - d) / 18; 543 for (i = 0; i < n; i++) 544 cb((struct detailed_timing *)(det_base + 18 * i), closure); 545 } 546 547 static void 548 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 549 { 550 unsigned int i, n = min((int)ext[0x02], 6); 551 u8 *det_base = ext + 5; 552 553 if (ext[0x01] != 1) 554 return; /* unknown version */ 555 556 for (i = 0; i < n; i++) 557 cb((struct detailed_timing *)(det_base + 18 * i), closure); 558 } 559 560 static void 561 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 562 { 563 int i; 564 struct edid *edid = (struct edid *)raw_edid; 565 566 if (edid == NULL) 567 return; 568 569 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 570 cb(&(edid->detailed_timings[i]), closure); 571 572 for (i = 1; i <= raw_edid[0x7e]; i++) { 573 u8 *ext = raw_edid + (i * EDID_LENGTH); 574 switch (*ext) { 575 case CEA_EXT: 576 cea_for_each_detailed_block(ext, cb, closure); 577 break; 578 case VTB_EXT: 579 vtb_for_each_detailed_block(ext, cb, closure); 580 break; 581 default: 582 break; 583 } 584 } 585 } 586 587 static void 588 is_rb(struct detailed_timing *t, void *data) 589 { 590 u8 *r = (u8 *)t; 591 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 592 if (r[15] & 0x10) 593 *(bool *)data = true; 594 } 595 596 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 597 static bool 598 drm_monitor_supports_rb(struct edid *edid) 599 { 600 if (edid->revision >= 4) { 601 bool ret; 602 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 603 return ret; 604 } 605 606 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 607 } 608 609 static void 610 find_gtf2(struct detailed_timing *t, void *data) 611 { 612 u8 *r = (u8 *)t; 613 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 614 *(u8 **)data = r; 615 } 616 617 /* Secondary GTF curve kicks in above some break frequency */ 618 static int 619 drm_gtf2_hbreak(struct edid *edid) 620 { 621 u8 *r = NULL; 622 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 623 return r ? (r[12] * 2) : 0; 624 } 625 626 static int 627 drm_gtf2_2c(struct edid *edid) 628 { 629 u8 *r = NULL; 630 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 631 return r ? r[13] : 0; 632 } 633 634 static int 635 drm_gtf2_m(struct edid *edid) 636 { 637 u8 *r = NULL; 638 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 639 return r ? (r[15] << 8) + r[14] : 0; 640 } 641 642 static int 643 drm_gtf2_k(struct edid *edid) 644 { 645 u8 *r = NULL; 646 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 647 return r ? r[16] : 0; 648 } 649 650 static int 651 drm_gtf2_2j(struct edid *edid) 652 { 653 u8 *r = NULL; 654 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 655 return r ? r[17] : 0; 656 } 657 658 /** 659 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 660 * @edid: EDID block to scan 661 */ 662 static int standard_timing_level(struct edid *edid) 663 { 664 if (edid->revision >= 2) { 665 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 666 return LEVEL_CVT; 667 if (drm_gtf2_hbreak(edid)) 668 return LEVEL_GTF2; 669 return LEVEL_GTF; 670 } 671 return LEVEL_DMT; 672 } 673 674 /* 675 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 676 * monitors fill with ascii space (0x20) instead. 677 */ 678 static int 679 bad_std_timing(u8 a, u8 b) 680 { 681 return (a == 0x00 && b == 0x00) || 682 (a == 0x01 && b == 0x01) || 683 (a == 0x20 && b == 0x20); 684 } 685 686 /** 687 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 688 * @t: standard timing params 689 * @timing_level: standard timing level 690 * 691 * Take the standard timing params (in this case width, aspect, and refresh) 692 * and convert them into a real mode using CVT/GTF/DMT. 693 */ 694 static struct drm_display_mode * 695 drm_mode_std(struct drm_connector *connector, struct edid *edid, 696 struct std_timing *t, int revision) 697 { 698 struct drm_device *dev = connector->dev; 699 struct drm_display_mode *m, *mode = NULL; 700 int hsize, vsize; 701 int vrefresh_rate; 702 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 703 >> EDID_TIMING_ASPECT_SHIFT; 704 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 705 >> EDID_TIMING_VFREQ_SHIFT; 706 int timing_level = standard_timing_level(edid); 707 708 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 709 return NULL; 710 711 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 712 hsize = t->hsize * 8 + 248; 713 /* vrefresh_rate = vfreq + 60 */ 714 vrefresh_rate = vfreq + 60; 715 /* the vdisplay is calculated based on the aspect ratio */ 716 if (aspect_ratio == 0) { 717 if (revision < 3) 718 vsize = hsize; 719 else 720 vsize = (hsize * 10) / 16; 721 } else if (aspect_ratio == 1) 722 vsize = (hsize * 3) / 4; 723 else if (aspect_ratio == 2) 724 vsize = (hsize * 4) / 5; 725 else 726 vsize = (hsize * 9) / 16; 727 728 /* HDTV hack, part 1 */ 729 if (vrefresh_rate == 60 && 730 ((hsize == 1360 && vsize == 765) || 731 (hsize == 1368 && vsize == 769))) { 732 hsize = 1366; 733 vsize = 768; 734 } 735 736 /* 737 * If this connector already has a mode for this size and refresh 738 * rate (because it came from detailed or CVT info), use that 739 * instead. This way we don't have to guess at interlace or 740 * reduced blanking. 741 */ 742 list_for_each_entry(m, &connector->probed_modes, head) 743 if (m->hdisplay == hsize && m->vdisplay == vsize && 744 drm_mode_vrefresh(m) == vrefresh_rate) 745 return NULL; 746 747 /* HDTV hack, part 2 */ 748 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 749 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 750 false); 751 mode->hdisplay = 1366; 752 mode->hsync_start = mode->hsync_start - 1; 753 mode->hsync_end = mode->hsync_end - 1; 754 return mode; 755 } 756 757 /* check whether it can be found in default mode table */ 758 if (drm_monitor_supports_rb(edid)) { 759 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, 760 true); 761 if (mode) 762 return mode; 763 } 764 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false); 765 if (mode) 766 return mode; 767 768 /* okay, generate it */ 769 switch (timing_level) { 770 case LEVEL_DMT: 771 break; 772 case LEVEL_GTF: 773 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 774 break; 775 case LEVEL_GTF2: 776 /* 777 * This is potentially wrong if there's ever a monitor with 778 * more than one ranges section, each claiming a different 779 * secondary GTF curve. Please don't do that. 780 */ 781 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 782 if (!mode) 783 return NULL; 784 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 785 drm_mode_destroy(dev, mode); 786 mode = drm_gtf_mode_complex(dev, hsize, vsize, 787 vrefresh_rate, 0, 0, 788 drm_gtf2_m(edid), 789 drm_gtf2_2c(edid), 790 drm_gtf2_k(edid), 791 drm_gtf2_2j(edid)); 792 } 793 break; 794 case LEVEL_CVT: 795 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 796 false); 797 break; 798 } 799 return mode; 800 } 801 802 /* 803 * EDID is delightfully ambiguous about how interlaced modes are to be 804 * encoded. Our internal representation is of frame height, but some 805 * HDTV detailed timings are encoded as field height. 806 * 807 * The format list here is from CEA, in frame size. Technically we 808 * should be checking refresh rate too. Whatever. 809 */ 810 static void 811 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 812 struct detailed_pixel_timing *pt) 813 { 814 int i; 815 static const struct { 816 int w, h; 817 } cea_interlaced[] = { 818 { 1920, 1080 }, 819 { 720, 480 }, 820 { 1440, 480 }, 821 { 2880, 480 }, 822 { 720, 576 }, 823 { 1440, 576 }, 824 { 2880, 576 }, 825 }; 826 827 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 828 return; 829 830 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 831 if ((mode->hdisplay == cea_interlaced[i].w) && 832 (mode->vdisplay == cea_interlaced[i].h / 2)) { 833 mode->vdisplay *= 2; 834 mode->vsync_start *= 2; 835 mode->vsync_end *= 2; 836 mode->vtotal *= 2; 837 mode->vtotal |= 1; 838 } 839 } 840 841 mode->flags |= DRM_MODE_FLAG_INTERLACE; 842 } 843 844 /** 845 * drm_mode_detailed - create a new mode from an EDID detailed timing section 846 * @dev: DRM device (needed to create new mode) 847 * @edid: EDID block 848 * @timing: EDID detailed timing info 849 * @quirks: quirks to apply 850 * 851 * An EDID detailed timing block contains enough info for us to create and 852 * return a new struct drm_display_mode. 853 */ 854 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 855 struct edid *edid, 856 struct detailed_timing *timing, 857 u32 quirks) 858 { 859 struct drm_display_mode *mode; 860 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 861 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 862 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 863 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 864 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 865 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 866 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 867 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 868 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 869 870 /* ignore tiny modes */ 871 if (hactive < 64 || vactive < 64) 872 return NULL; 873 874 if (pt->misc & DRM_EDID_PT_STEREO) { 875 printk(KERN_WARNING "stereo mode not supported\n"); 876 return NULL; 877 } 878 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 879 printk(KERN_WARNING "composite sync not supported\n"); 880 } 881 882 /* it is incorrect if hsync/vsync width is zero */ 883 if (!hsync_pulse_width || !vsync_pulse_width) { 884 DRM_DEBUG_KMS("Incorrect Detailed timing. " 885 "Wrong Hsync/Vsync pulse width\n"); 886 return NULL; 887 } 888 mode = drm_mode_create(dev); 889 if (!mode) 890 return NULL; 891 892 mode->type = DRM_MODE_TYPE_DRIVER; 893 894 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 895 timing->pixel_clock = cpu_to_le16(1088); 896 897 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 898 899 mode->hdisplay = hactive; 900 mode->hsync_start = mode->hdisplay + hsync_offset; 901 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 902 mode->htotal = mode->hdisplay + hblank; 903 904 mode->vdisplay = vactive; 905 mode->vsync_start = mode->vdisplay + vsync_offset; 906 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 907 mode->vtotal = mode->vdisplay + vblank; 908 909 /* Some EDIDs have bogus h/vtotal values */ 910 if (mode->hsync_end > mode->htotal) 911 mode->htotal = mode->hsync_end + 1; 912 if (mode->vsync_end > mode->vtotal) 913 mode->vtotal = mode->vsync_end + 1; 914 915 drm_mode_do_interlace_quirk(mode, pt); 916 917 drm_mode_set_name(mode); 918 919 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 920 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 921 } 922 923 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 924 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 925 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 926 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 927 928 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 929 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 930 931 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 932 mode->width_mm *= 10; 933 mode->height_mm *= 10; 934 } 935 936 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 937 mode->width_mm = edid->width_cm * 10; 938 mode->height_mm = edid->height_cm * 10; 939 } 940 941 return mode; 942 } 943 944 static bool 945 mode_in_hsync_range(const struct drm_display_mode *mode, 946 struct edid *edid, u8 *t) 947 { 948 int hsync, hmin, hmax; 949 950 hmin = t[7]; 951 if (edid->revision >= 4) 952 hmin += ((t[4] & 0x04) ? 255 : 0); 953 hmax = t[8]; 954 if (edid->revision >= 4) 955 hmax += ((t[4] & 0x08) ? 255 : 0); 956 hsync = drm_mode_hsync(mode); 957 958 return (hsync <= hmax && hsync >= hmin); 959 } 960 961 static bool 962 mode_in_vsync_range(const struct drm_display_mode *mode, 963 struct edid *edid, u8 *t) 964 { 965 int vsync, vmin, vmax; 966 967 vmin = t[5]; 968 if (edid->revision >= 4) 969 vmin += ((t[4] & 0x01) ? 255 : 0); 970 vmax = t[6]; 971 if (edid->revision >= 4) 972 vmax += ((t[4] & 0x02) ? 255 : 0); 973 vsync = drm_mode_vrefresh(mode); 974 975 return (vsync <= vmax && vsync >= vmin); 976 } 977 978 static u32 979 range_pixel_clock(struct edid *edid, u8 *t) 980 { 981 /* unspecified */ 982 if (t[9] == 0 || t[9] == 255) 983 return 0; 984 985 /* 1.4 with CVT support gives us real precision, yay */ 986 if (edid->revision >= 4 && t[10] == 0x04) 987 return (t[9] * 10000) - ((t[12] >> 2) * 250); 988 989 /* 1.3 is pathetic, so fuzz up a bit */ 990 return t[9] * 10000 + 5001; 991 } 992 993 static bool 994 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 995 struct detailed_timing *timing) 996 { 997 u32 max_clock; 998 u8 *t = (u8 *)timing; 999 1000 if (!mode_in_hsync_range(mode, edid, t)) 1001 return false; 1002 1003 if (!mode_in_vsync_range(mode, edid, t)) 1004 return false; 1005 1006 if ((max_clock = range_pixel_clock(edid, t))) 1007 if (mode->clock > max_clock) 1008 return false; 1009 1010 /* 1.4 max horizontal check */ 1011 if (edid->revision >= 4 && t[10] == 0x04) 1012 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1013 return false; 1014 1015 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1016 return false; 1017 1018 return true; 1019 } 1020 1021 static int 1022 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1023 struct detailed_timing *timing) 1024 { 1025 int i, modes = 0; 1026 struct drm_display_mode *newmode; 1027 struct drm_device *dev = connector->dev; 1028 1029 for (i = 0; i < drm_num_dmt_modes; i++) { 1030 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1031 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1032 if (newmode) { 1033 drm_mode_probed_add(connector, newmode); 1034 modes++; 1035 } 1036 } 1037 } 1038 1039 return modes; 1040 } 1041 1042 /* fix up 1366x768 mode from 1368x768; 1043 * GFT/CVT can't express 1366 width which isn't dividable by 8 1044 */ 1045 static void fixup_mode_1366x768(struct drm_display_mode *mode) 1046 { 1047 if (mode->hdisplay == 1368 && mode->vdisplay == 768) { 1048 mode->hdisplay = 1366; 1049 mode->hsync_start--; 1050 mode->hsync_end--; 1051 drm_mode_set_name(mode); 1052 } 1053 } 1054 1055 static int 1056 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1057 struct detailed_timing *timing) 1058 { 1059 int i, modes = 0; 1060 struct drm_display_mode *newmode; 1061 struct drm_device *dev = connector->dev; 1062 1063 for (i = 0; i < num_extra_modes; i++) { 1064 const struct minimode *m = &extra_modes[i]; 1065 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0); 1066 if (!newmode) 1067 return modes; 1068 1069 fixup_mode_1366x768(newmode); 1070 if (!mode_in_range(newmode, edid, timing)) { 1071 drm_mode_destroy(dev, newmode); 1072 continue; 1073 } 1074 1075 drm_mode_probed_add(connector, newmode); 1076 modes++; 1077 } 1078 1079 return modes; 1080 } 1081 1082 static int 1083 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1084 struct detailed_timing *timing) 1085 { 1086 int i, modes = 0; 1087 struct drm_display_mode *newmode; 1088 struct drm_device *dev = connector->dev; 1089 bool rb = drm_monitor_supports_rb(edid); 1090 1091 for (i = 0; i < num_extra_modes; i++) { 1092 const struct minimode *m = &extra_modes[i]; 1093 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0); 1094 if (!newmode) 1095 return modes; 1096 1097 fixup_mode_1366x768(newmode); 1098 if (!mode_in_range(newmode, edid, timing)) { 1099 drm_mode_destroy(dev, newmode); 1100 continue; 1101 } 1102 1103 drm_mode_probed_add(connector, newmode); 1104 modes++; 1105 } 1106 1107 return modes; 1108 } 1109 1110 static void 1111 do_inferred_modes(struct detailed_timing *timing, void *c) 1112 { 1113 struct detailed_mode_closure *closure = c; 1114 struct detailed_non_pixel *data = &timing->data.other_data; 1115 struct detailed_data_monitor_range *range = &data->data.range; 1116 1117 if (data->type != EDID_DETAIL_MONITOR_RANGE) 1118 return; 1119 1120 closure->modes += drm_dmt_modes_for_range(closure->connector, 1121 closure->edid, 1122 timing); 1123 1124 if (!version_greater(closure->edid, 1, 1)) 1125 return; /* GTF not defined yet */ 1126 1127 switch (range->flags) { 1128 case 0x02: /* secondary gtf, XXX could do more */ 1129 case 0x00: /* default gtf */ 1130 closure->modes += drm_gtf_modes_for_range(closure->connector, 1131 closure->edid, 1132 timing); 1133 break; 1134 case 0x04: /* cvt, only in 1.4+ */ 1135 if (!version_greater(closure->edid, 1, 3)) 1136 break; 1137 1138 closure->modes += drm_cvt_modes_for_range(closure->connector, 1139 closure->edid, 1140 timing); 1141 break; 1142 case 0x01: /* just the ranges, no formula */ 1143 default: 1144 break; 1145 } 1146 } 1147 1148 static int 1149 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1150 { 1151 struct detailed_mode_closure closure = { 1152 connector, edid, 0, 0, 0 1153 }; 1154 1155 if (version_greater(edid, 1, 0)) 1156 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1157 &closure); 1158 1159 return closure.modes; 1160 } 1161 1162 static int 1163 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1164 { 1165 int i, j, m, modes = 0; 1166 struct drm_display_mode *mode; 1167 u8 *est = ((u8 *)timing) + 5; 1168 1169 for (i = 0; i < 6; i++) { 1170 for (j = 7; j > 0; j--) { 1171 m = (i * 8) + (7 - j); 1172 if (m >= ARRAY_SIZE(est3_modes)) 1173 break; 1174 if (est[i] & (1 << j)) { 1175 mode = drm_mode_find_dmt(connector->dev, 1176 est3_modes[m].w, 1177 est3_modes[m].h, 1178 est3_modes[m].r, 1179 est3_modes[m].rb); 1180 if (mode) { 1181 drm_mode_probed_add(connector, mode); 1182 modes++; 1183 } 1184 } 1185 } 1186 } 1187 1188 return modes; 1189 } 1190 1191 static void 1192 do_established_modes(struct detailed_timing *timing, void *c) 1193 { 1194 struct detailed_mode_closure *closure = c; 1195 struct detailed_non_pixel *data = &timing->data.other_data; 1196 1197 if (data->type == EDID_DETAIL_EST_TIMINGS) 1198 closure->modes += drm_est3_modes(closure->connector, timing); 1199 } 1200 1201 /** 1202 * add_established_modes - get est. modes from EDID and add them 1203 * @edid: EDID block to scan 1204 * 1205 * Each EDID block contains a bitmap of the supported "established modes" list 1206 * (defined above). Tease them out and add them to the global modes list. 1207 */ 1208 static int 1209 add_established_modes(struct drm_connector *connector, struct edid *edid) 1210 { 1211 struct drm_device *dev = connector->dev; 1212 unsigned long est_bits = edid->established_timings.t1 | 1213 (edid->established_timings.t2 << 8) | 1214 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1215 int i, modes = 0; 1216 struct detailed_mode_closure closure = { 1217 connector, edid, 0, 0, 0 1218 }; 1219 1220 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1221 if (est_bits & (1<<i)) { 1222 struct drm_display_mode *newmode; 1223 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1224 if (newmode) { 1225 drm_mode_probed_add(connector, newmode); 1226 modes++; 1227 } 1228 } 1229 } 1230 1231 if (version_greater(edid, 1, 0)) 1232 drm_for_each_detailed_block((u8 *)edid, 1233 do_established_modes, &closure); 1234 1235 return modes + closure.modes; 1236 } 1237 1238 static void 1239 do_standard_modes(struct detailed_timing *timing, void *c) 1240 { 1241 struct detailed_mode_closure *closure = c; 1242 struct detailed_non_pixel *data = &timing->data.other_data; 1243 struct drm_connector *connector = closure->connector; 1244 struct edid *edid = closure->edid; 1245 1246 if (data->type == EDID_DETAIL_STD_MODES) { 1247 int i; 1248 for (i = 0; i < 6; i++) { 1249 struct std_timing *std; 1250 struct drm_display_mode *newmode; 1251 1252 std = &data->data.timings[i]; 1253 newmode = drm_mode_std(connector, edid, std, 1254 edid->revision); 1255 if (newmode) { 1256 drm_mode_probed_add(connector, newmode); 1257 closure->modes++; 1258 } 1259 } 1260 } 1261 } 1262 1263 /** 1264 * add_standard_modes - get std. modes from EDID and add them 1265 * @edid: EDID block to scan 1266 * 1267 * Standard modes can be calculated using the appropriate standard (DMT, 1268 * GTF or CVT. Grab them from @edid and add them to the list. 1269 */ 1270 static int 1271 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1272 { 1273 int i, modes = 0; 1274 struct detailed_mode_closure closure = { 1275 connector, edid, 0, 0, 0 1276 }; 1277 1278 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1279 struct drm_display_mode *newmode; 1280 1281 newmode = drm_mode_std(connector, edid, 1282 &edid->standard_timings[i], 1283 edid->revision); 1284 if (newmode) { 1285 drm_mode_probed_add(connector, newmode); 1286 modes++; 1287 } 1288 } 1289 1290 if (version_greater(edid, 1, 0)) 1291 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1292 &closure); 1293 1294 /* XXX should also look for standard codes in VTB blocks */ 1295 1296 return modes + closure.modes; 1297 } 1298 1299 static int drm_cvt_modes(struct drm_connector *connector, 1300 struct detailed_timing *timing) 1301 { 1302 int i, j, modes = 0; 1303 struct drm_display_mode *newmode; 1304 struct drm_device *dev = connector->dev; 1305 struct cvt_timing *cvt; 1306 const int rates[] = { 60, 85, 75, 60, 50 }; 1307 const u8 empty[3] = { 0, 0, 0 }; 1308 1309 for (i = 0; i < 4; i++) { 1310 int uninitialized_var(width), height; 1311 cvt = &(timing->data.other_data.data.cvt[i]); 1312 1313 if (!memcmp(cvt->code, empty, 3)) 1314 continue; 1315 1316 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1317 switch (cvt->code[1] & 0x0c) { 1318 case 0x00: 1319 width = height * 4 / 3; 1320 break; 1321 case 0x04: 1322 width = height * 16 / 9; 1323 break; 1324 case 0x08: 1325 width = height * 16 / 10; 1326 break; 1327 case 0x0c: 1328 width = height * 15 / 9; 1329 break; 1330 } 1331 1332 for (j = 1; j < 5; j++) { 1333 if (cvt->code[2] & (1 << j)) { 1334 newmode = drm_cvt_mode(dev, width, height, 1335 rates[j], j == 0, 1336 false, false); 1337 if (newmode) { 1338 drm_mode_probed_add(connector, newmode); 1339 modes++; 1340 } 1341 } 1342 } 1343 } 1344 1345 return modes; 1346 } 1347 1348 static void 1349 do_cvt_mode(struct detailed_timing *timing, void *c) 1350 { 1351 struct detailed_mode_closure *closure = c; 1352 struct detailed_non_pixel *data = &timing->data.other_data; 1353 1354 if (data->type == EDID_DETAIL_CVT_3BYTE) 1355 closure->modes += drm_cvt_modes(closure->connector, timing); 1356 } 1357 1358 static int 1359 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1360 { 1361 struct detailed_mode_closure closure = { 1362 connector, edid, 0, 0, 0 1363 }; 1364 1365 if (version_greater(edid, 1, 2)) 1366 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1367 1368 /* XXX should also look for CVT codes in VTB blocks */ 1369 1370 return closure.modes; 1371 } 1372 1373 static void 1374 do_detailed_mode(struct detailed_timing *timing, void *c) 1375 { 1376 struct detailed_mode_closure *closure = c; 1377 struct drm_display_mode *newmode; 1378 1379 if (timing->pixel_clock) { 1380 newmode = drm_mode_detailed(closure->connector->dev, 1381 closure->edid, timing, 1382 closure->quirks); 1383 if (!newmode) 1384 return; 1385 1386 if (closure->preferred) 1387 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1388 1389 drm_mode_probed_add(closure->connector, newmode); 1390 closure->modes++; 1391 closure->preferred = 0; 1392 } 1393 } 1394 1395 /* 1396 * add_detailed_modes - Add modes from detailed timings 1397 * @connector: attached connector 1398 * @edid: EDID block to scan 1399 * @quirks: quirks to apply 1400 */ 1401 static int 1402 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1403 u32 quirks) 1404 { 1405 struct detailed_mode_closure closure = { 1406 connector, 1407 edid, 1408 1, 1409 quirks, 1410 0 1411 }; 1412 1413 if (closure.preferred && !version_greater(edid, 1, 3)) 1414 closure.preferred = 1415 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1416 1417 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1418 1419 return closure.modes; 1420 } 1421 1422 #define HDMI_IDENTIFIER 0x000C03 1423 #define AUDIO_BLOCK 0x01 1424 #define VIDEO_BLOCK 0x02 1425 #define VENDOR_BLOCK 0x03 1426 #define SPEAKER_BLOCK 0x04 1427 #define EDID_BASIC_AUDIO (1 << 6) 1428 #define EDID_CEA_YCRCB444 (1 << 5) 1429 #define EDID_CEA_YCRCB422 (1 << 4) 1430 1431 /** 1432 * Search EDID for CEA extension block. 1433 */ 1434 u8 *drm_find_cea_extension(struct edid *edid) 1435 { 1436 u8 *edid_ext = NULL; 1437 int i; 1438 1439 /* No EDID or EDID extensions */ 1440 if (edid == NULL || edid->extensions == 0) 1441 return NULL; 1442 1443 /* Find CEA extension */ 1444 for (i = 0; i < edid->extensions; i++) { 1445 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1446 if (edid_ext[0] == CEA_EXT) 1447 break; 1448 } 1449 1450 if (i == edid->extensions) 1451 return NULL; 1452 1453 return edid_ext; 1454 } 1455 EXPORT_SYMBOL(drm_find_cea_extension); 1456 1457 static int 1458 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1459 { 1460 struct drm_device *dev = connector->dev; 1461 u8 * mode, cea_mode; 1462 int modes = 0; 1463 1464 for (mode = db; mode < db + len; mode++) { 1465 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1466 if (cea_mode < drm_num_cea_modes) { 1467 struct drm_display_mode *newmode; 1468 newmode = drm_mode_duplicate(dev, 1469 &edid_cea_modes[cea_mode]); 1470 if (newmode) { 1471 drm_mode_probed_add(connector, newmode); 1472 modes++; 1473 } 1474 } 1475 } 1476 1477 return modes; 1478 } 1479 1480 static int 1481 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1482 { 1483 u8 * cea = drm_find_cea_extension(edid); 1484 u8 * db, dbl; 1485 int modes = 0; 1486 1487 if (cea && cea[1] >= 3) { 1488 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1489 dbl = db[0] & 0x1f; 1490 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK) 1491 modes += do_cea_modes (connector, db+1, dbl); 1492 } 1493 } 1494 1495 return modes; 1496 } 1497 1498 static void 1499 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1500 { 1501 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1502 1503 connector->dvi_dual = db[6] & 1; 1504 connector->max_tmds_clock = db[7] * 5; 1505 1506 connector->latency_present[0] = db[8] >> 7; 1507 connector->latency_present[1] = (db[8] >> 6) & 1; 1508 connector->video_latency[0] = db[9]; 1509 connector->audio_latency[0] = db[10]; 1510 connector->video_latency[1] = db[11]; 1511 connector->audio_latency[1] = db[12]; 1512 1513 DRM_LOG_KMS("HDMI: DVI dual %d, " 1514 "max TMDS clock %d, " 1515 "latency present %d %d, " 1516 "video latency %d %d, " 1517 "audio latency %d %d\n", 1518 connector->dvi_dual, 1519 connector->max_tmds_clock, 1520 (int) connector->latency_present[0], 1521 (int) connector->latency_present[1], 1522 connector->video_latency[0], 1523 connector->video_latency[1], 1524 connector->audio_latency[0], 1525 connector->audio_latency[1]); 1526 } 1527 1528 static void 1529 monitor_name(struct detailed_timing *t, void *data) 1530 { 1531 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1532 *(u8 **)data = t->data.other_data.data.str.str; 1533 } 1534 1535 /** 1536 * drm_edid_to_eld - build ELD from EDID 1537 * @connector: connector corresponding to the HDMI/DP sink 1538 * @edid: EDID to parse 1539 * 1540 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1541 * Some ELD fields are left to the graphics driver caller: 1542 * - Conn_Type 1543 * - HDCP 1544 * - Port_ID 1545 */ 1546 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1547 { 1548 uint8_t *eld = connector->eld; 1549 u8 *cea; 1550 u8 *name; 1551 u8 *db; 1552 int sad_count = 0; 1553 int mnl; 1554 int dbl; 1555 1556 memset(eld, 0, sizeof(connector->eld)); 1557 1558 cea = drm_find_cea_extension(edid); 1559 if (!cea) { 1560 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1561 return; 1562 } 1563 1564 name = NULL; 1565 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1566 for (mnl = 0; name && mnl < 13; mnl++) { 1567 if (name[mnl] == 0x0a) 1568 break; 1569 eld[20 + mnl] = name[mnl]; 1570 } 1571 eld[4] = (cea[1] << 5) | mnl; 1572 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1573 1574 eld[0] = 2 << 3; /* ELD version: 2 */ 1575 1576 eld[16] = edid->mfg_id[0]; 1577 eld[17] = edid->mfg_id[1]; 1578 eld[18] = edid->prod_code[0]; 1579 eld[19] = edid->prod_code[1]; 1580 1581 if (cea[1] >= 3) 1582 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1583 dbl = db[0] & 0x1f; 1584 1585 switch ((db[0] & 0xe0) >> 5) { 1586 case AUDIO_BLOCK: 1587 /* Audio Data Block, contains SADs */ 1588 sad_count = dbl / 3; 1589 memcpy(eld + 20 + mnl, &db[1], dbl); 1590 break; 1591 case SPEAKER_BLOCK: 1592 /* Speaker Allocation Data Block */ 1593 eld[7] = db[1]; 1594 break; 1595 case VENDOR_BLOCK: 1596 /* HDMI Vendor-Specific Data Block */ 1597 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1598 parse_hdmi_vsdb(connector, db); 1599 break; 1600 default: 1601 break; 1602 } 1603 } 1604 eld[5] |= sad_count << 4; 1605 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1606 1607 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1608 } 1609 EXPORT_SYMBOL(drm_edid_to_eld); 1610 1611 /** 1612 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1613 * @connector: connector associated with the HDMI/DP sink 1614 * @mode: the display mode 1615 */ 1616 int drm_av_sync_delay(struct drm_connector *connector, 1617 struct drm_display_mode *mode) 1618 { 1619 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1620 int a, v; 1621 1622 if (!connector->latency_present[0]) 1623 return 0; 1624 if (!connector->latency_present[1]) 1625 i = 0; 1626 1627 a = connector->audio_latency[i]; 1628 v = connector->video_latency[i]; 1629 1630 /* 1631 * HDMI/DP sink doesn't support audio or video? 1632 */ 1633 if (a == 255 || v == 255) 1634 return 0; 1635 1636 /* 1637 * Convert raw EDID values to millisecond. 1638 * Treat unknown latency as 0ms. 1639 */ 1640 if (a) 1641 a = min(2 * (a - 1), 500); 1642 if (v) 1643 v = min(2 * (v - 1), 500); 1644 1645 return max(v - a, 0); 1646 } 1647 EXPORT_SYMBOL(drm_av_sync_delay); 1648 1649 /** 1650 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1651 * @encoder: the encoder just changed display mode 1652 * @mode: the adjusted display mode 1653 * 1654 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1655 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1656 */ 1657 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1658 struct drm_display_mode *mode) 1659 { 1660 struct drm_connector *connector; 1661 struct drm_device *dev = encoder->dev; 1662 1663 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1664 if (connector->encoder == encoder && connector->eld[0]) 1665 return connector; 1666 1667 return NULL; 1668 } 1669 EXPORT_SYMBOL(drm_select_eld); 1670 1671 /** 1672 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1673 * @edid: monitor EDID information 1674 * 1675 * Parse the CEA extension according to CEA-861-B. 1676 * Return true if HDMI, false if not or unknown. 1677 */ 1678 bool drm_detect_hdmi_monitor(struct edid *edid) 1679 { 1680 u8 *edid_ext; 1681 int i, hdmi_id; 1682 int start_offset, end_offset; 1683 bool is_hdmi = false; 1684 1685 edid_ext = drm_find_cea_extension(edid); 1686 if (!edid_ext) 1687 goto end; 1688 1689 /* Data block offset in CEA extension block */ 1690 start_offset = 4; 1691 end_offset = edid_ext[2]; 1692 1693 /* 1694 * Because HDMI identifier is in Vendor Specific Block, 1695 * search it from all data blocks of CEA extension. 1696 */ 1697 for (i = start_offset; i < end_offset; 1698 /* Increased by data block len */ 1699 i += ((edid_ext[i] & 0x1f) + 1)) { 1700 /* Find vendor specific block */ 1701 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1702 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1703 edid_ext[i + 3] << 16; 1704 /* Find HDMI identifier */ 1705 if (hdmi_id == HDMI_IDENTIFIER) 1706 is_hdmi = true; 1707 break; 1708 } 1709 } 1710 1711 end: 1712 return is_hdmi; 1713 } 1714 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1715 1716 /** 1717 * drm_detect_monitor_audio - check monitor audio capability 1718 * 1719 * Monitor should have CEA extension block. 1720 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1721 * audio' only. If there is any audio extension block and supported 1722 * audio format, assume at least 'basic audio' support, even if 'basic 1723 * audio' is not defined in EDID. 1724 * 1725 */ 1726 bool drm_detect_monitor_audio(struct edid *edid) 1727 { 1728 u8 *edid_ext; 1729 int i, j; 1730 bool has_audio = false; 1731 int start_offset, end_offset; 1732 1733 edid_ext = drm_find_cea_extension(edid); 1734 if (!edid_ext) 1735 goto end; 1736 1737 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1738 1739 if (has_audio) { 1740 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1741 goto end; 1742 } 1743 1744 /* Data block offset in CEA extension block */ 1745 start_offset = 4; 1746 end_offset = edid_ext[2]; 1747 1748 for (i = start_offset; i < end_offset; 1749 i += ((edid_ext[i] & 0x1f) + 1)) { 1750 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1751 has_audio = true; 1752 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1753 DRM_DEBUG_KMS("CEA audio format %d\n", 1754 (edid_ext[i + j] >> 3) & 0xf); 1755 goto end; 1756 } 1757 } 1758 end: 1759 return has_audio; 1760 } 1761 EXPORT_SYMBOL(drm_detect_monitor_audio); 1762 1763 /** 1764 * drm_add_display_info - pull display info out if present 1765 * @edid: EDID data 1766 * @info: display info (attached to connector) 1767 * 1768 * Grab any available display info and stuff it into the drm_display_info 1769 * structure that's part of the connector. Useful for tracking bpp and 1770 * color spaces. 1771 */ 1772 static void drm_add_display_info(struct edid *edid, 1773 struct drm_display_info *info) 1774 { 1775 u8 *edid_ext; 1776 1777 info->width_mm = edid->width_cm * 10; 1778 info->height_mm = edid->height_cm * 10; 1779 1780 /* driver figures it out in this case */ 1781 info->bpc = 0; 1782 info->color_formats = 0; 1783 1784 if (edid->revision < 3) 1785 return; 1786 1787 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1788 return; 1789 1790 /* Get data from CEA blocks if present */ 1791 edid_ext = drm_find_cea_extension(edid); 1792 if (edid_ext) { 1793 info->cea_rev = edid_ext[1]; 1794 1795 /* The existence of a CEA block should imply RGB support */ 1796 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1797 if (edid_ext[3] & EDID_CEA_YCRCB444) 1798 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1799 if (edid_ext[3] & EDID_CEA_YCRCB422) 1800 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1801 } 1802 1803 /* Only defined for 1.4 with digital displays */ 1804 if (edid->revision < 4) 1805 return; 1806 1807 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1808 case DRM_EDID_DIGITAL_DEPTH_6: 1809 info->bpc = 6; 1810 break; 1811 case DRM_EDID_DIGITAL_DEPTH_8: 1812 info->bpc = 8; 1813 break; 1814 case DRM_EDID_DIGITAL_DEPTH_10: 1815 info->bpc = 10; 1816 break; 1817 case DRM_EDID_DIGITAL_DEPTH_12: 1818 info->bpc = 12; 1819 break; 1820 case DRM_EDID_DIGITAL_DEPTH_14: 1821 info->bpc = 14; 1822 break; 1823 case DRM_EDID_DIGITAL_DEPTH_16: 1824 info->bpc = 16; 1825 break; 1826 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1827 default: 1828 info->bpc = 0; 1829 break; 1830 } 1831 1832 info->color_formats |= DRM_COLOR_FORMAT_RGB444; 1833 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444) 1834 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1835 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) 1836 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1837 } 1838 1839 /** 1840 * drm_add_edid_modes - add modes from EDID data, if available 1841 * @connector: connector we're probing 1842 * @edid: edid data 1843 * 1844 * Add the specified modes to the connector's mode list. 1845 * 1846 * Return number of modes added or 0 if we couldn't find any. 1847 */ 1848 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1849 { 1850 int num_modes = 0; 1851 u32 quirks; 1852 1853 if (edid == NULL) { 1854 return 0; 1855 } 1856 if (!drm_edid_is_valid(edid)) { 1857 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1858 drm_get_connector_name(connector)); 1859 return 0; 1860 } 1861 1862 quirks = edid_get_quirks(edid); 1863 1864 /* 1865 * EDID spec says modes should be preferred in this order: 1866 * - preferred detailed mode 1867 * - other detailed modes from base block 1868 * - detailed modes from extension blocks 1869 * - CVT 3-byte code modes 1870 * - standard timing codes 1871 * - established timing codes 1872 * - modes inferred from GTF or CVT range information 1873 * 1874 * We get this pretty much right. 1875 * 1876 * XXX order for additional mode types in extension blocks? 1877 */ 1878 num_modes += add_detailed_modes(connector, edid, quirks); 1879 num_modes += add_cvt_modes(connector, edid); 1880 num_modes += add_standard_modes(connector, edid); 1881 num_modes += add_established_modes(connector, edid); 1882 num_modes += add_inferred_modes(connector, edid); 1883 num_modes += add_cea_modes(connector, edid); 1884 1885 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1886 edid_fixup_preferred(connector, quirks); 1887 1888 drm_add_display_info(edid, &connector->display_info); 1889 1890 return num_modes; 1891 } 1892 EXPORT_SYMBOL(drm_add_edid_modes); 1893 1894 /** 1895 * drm_add_modes_noedid - add modes for the connectors without EDID 1896 * @connector: connector we're probing 1897 * @hdisplay: the horizontal display limit 1898 * @vdisplay: the vertical display limit 1899 * 1900 * Add the specified modes to the connector's mode list. Only when the 1901 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1902 * 1903 * Return number of modes added or 0 if we couldn't find any. 1904 */ 1905 int drm_add_modes_noedid(struct drm_connector *connector, 1906 int hdisplay, int vdisplay) 1907 { 1908 int i, count, num_modes = 0; 1909 struct drm_display_mode *mode; 1910 struct drm_device *dev = connector->dev; 1911 1912 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1913 if (hdisplay < 0) 1914 hdisplay = 0; 1915 if (vdisplay < 0) 1916 vdisplay = 0; 1917 1918 for (i = 0; i < count; i++) { 1919 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1920 if (hdisplay && vdisplay) { 1921 /* 1922 * Only when two are valid, they will be used to check 1923 * whether the mode should be added to the mode list of 1924 * the connector. 1925 */ 1926 if (ptr->hdisplay > hdisplay || 1927 ptr->vdisplay > vdisplay) 1928 continue; 1929 } 1930 if (drm_mode_vrefresh(ptr) > 61) 1931 continue; 1932 mode = drm_mode_duplicate(dev, ptr); 1933 if (mode) { 1934 drm_mode_probed_add(connector, mode); 1935 num_modes++; 1936 } 1937 } 1938 return num_modes; 1939 } 1940 EXPORT_SYMBOL(drm_add_modes_noedid); 1941