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/module.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 /* Force reduced-blanking timings for detailed modes */ 70 #define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7) 71 72 struct detailed_mode_closure { 73 struct drm_connector *connector; 74 struct edid *edid; 75 bool preferred; 76 u32 quirks; 77 int modes; 78 }; 79 80 #define LEVEL_DMT 0 81 #define LEVEL_GTF 1 82 #define LEVEL_GTF2 2 83 #define LEVEL_CVT 3 84 85 static struct edid_quirk { 86 char vendor[4]; 87 int product_id; 88 u32 quirks; 89 } edid_quirk_list[] = { 90 /* Acer AL1706 */ 91 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 92 /* Acer F51 */ 93 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 94 /* Unknown Acer */ 95 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 96 97 /* Belinea 10 15 55 */ 98 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 99 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 100 101 /* Envision Peripherals, Inc. EN-7100e */ 102 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 103 /* Envision EN2028 */ 104 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 105 106 /* Funai Electronics PM36B */ 107 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 108 EDID_QUIRK_DETAILED_IN_CM }, 109 110 /* LG Philips LCD LP154W01-A5 */ 111 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 112 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 113 114 /* Philips 107p5 CRT */ 115 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 116 117 /* Proview AY765C */ 118 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 119 120 /* Samsung SyncMaster 205BW. Note: irony */ 121 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 122 /* Samsung SyncMaster 22[5-6]BW */ 123 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 124 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 125 126 /* ViewSonic VA2026w */ 127 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING }, 128 }; 129 130 /*** DDC fetch and block validation ***/ 131 132 static const u8 edid_header[] = { 133 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 134 }; 135 136 /* 137 * Sanity check the header of the base EDID block. Return 8 if the header 138 * is perfect, down to 0 if it's totally wrong. 139 */ 140 int drm_edid_header_is_valid(const u8 *raw_edid) 141 { 142 int i, score = 0; 143 144 for (i = 0; i < sizeof(edid_header); i++) 145 if (raw_edid[i] == edid_header[i]) 146 score++; 147 148 return score; 149 } 150 EXPORT_SYMBOL(drm_edid_header_is_valid); 151 152 static int edid_fixup __read_mostly = 6; 153 module_param_named(edid_fixup, edid_fixup, int, 0400); 154 MODULE_PARM_DESC(edid_fixup, 155 "Minimum number of valid EDID header bytes (0-8, default 6)"); 156 157 /* 158 * Sanity check the EDID block (base or extension). Return 0 if the block 159 * doesn't check out, or 1 if it's valid. 160 */ 161 bool drm_edid_block_valid(u8 *raw_edid, int block) 162 { 163 int i; 164 u8 csum = 0; 165 struct edid *edid = (struct edid *)raw_edid; 166 167 if (edid_fixup > 8 || edid_fixup < 0) 168 edid_fixup = 6; 169 170 if (block == 0) { 171 int score = drm_edid_header_is_valid(raw_edid); 172 if (score == 8) ; 173 else if (score >= edid_fixup) { 174 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 175 memcpy(raw_edid, edid_header, sizeof(edid_header)); 176 } else { 177 goto bad; 178 } 179 } 180 181 for (i = 0; i < EDID_LENGTH; i++) 182 csum += raw_edid[i]; 183 if (csum) { 184 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 185 186 /* allow CEA to slide through, switches mangle this */ 187 if (raw_edid[0] != 0x02) 188 goto bad; 189 } 190 191 /* per-block-type checks */ 192 switch (raw_edid[0]) { 193 case 0: /* base */ 194 if (edid->version != 1) { 195 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 196 goto bad; 197 } 198 199 if (edid->revision > 4) 200 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 201 break; 202 203 default: 204 break; 205 } 206 207 return 1; 208 209 bad: 210 if (raw_edid) { 211 printk(KERN_ERR "Raw EDID:\n"); 212 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1, 213 raw_edid, EDID_LENGTH, false); 214 } 215 return 0; 216 } 217 EXPORT_SYMBOL(drm_edid_block_valid); 218 219 /** 220 * drm_edid_is_valid - sanity check EDID data 221 * @edid: EDID data 222 * 223 * Sanity-check an entire EDID record (including extensions) 224 */ 225 bool drm_edid_is_valid(struct edid *edid) 226 { 227 int i; 228 u8 *raw = (u8 *)edid; 229 230 if (!edid) 231 return false; 232 233 for (i = 0; i <= edid->extensions; i++) 234 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i)) 235 return false; 236 237 return true; 238 } 239 EXPORT_SYMBOL(drm_edid_is_valid); 240 241 #define DDC_SEGMENT_ADDR 0x30 242 /** 243 * Get EDID information via I2C. 244 * 245 * \param adapter : i2c device adaptor 246 * \param buf : EDID data buffer to be filled 247 * \param len : EDID data buffer length 248 * \return 0 on success or -1 on failure. 249 * 250 * Try to fetch EDID information by calling i2c driver function. 251 */ 252 static int 253 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, 254 int block, int len) 255 { 256 unsigned char start = block * EDID_LENGTH; 257 int ret, retries = 5; 258 259 /* The core i2c driver will automatically retry the transfer if the 260 * adapter reports EAGAIN. However, we find that bit-banging transfers 261 * are susceptible to errors under a heavily loaded machine and 262 * generate spurious NAKs and timeouts. Retrying the transfer 263 * of the individual block a few times seems to overcome this. 264 */ 265 do { 266 struct i2c_msg msgs[] = { 267 { 268 .addr = DDC_ADDR, 269 .flags = 0, 270 .len = 1, 271 .buf = &start, 272 }, { 273 .addr = DDC_ADDR, 274 .flags = I2C_M_RD, 275 .len = len, 276 .buf = buf, 277 } 278 }; 279 ret = i2c_transfer(adapter, msgs, 2); 280 if (ret == -ENXIO) { 281 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n", 282 adapter->name); 283 break; 284 } 285 } while (ret != 2 && --retries); 286 287 return ret == 2 ? 0 : -1; 288 } 289 290 static bool drm_edid_is_zero(u8 *in_edid, int length) 291 { 292 int i; 293 u32 *raw_edid = (u32 *)in_edid; 294 295 for (i = 0; i < length / 4; i++) 296 if (*(raw_edid + i) != 0) 297 return false; 298 return true; 299 } 300 301 static u8 * 302 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 303 { 304 int i, j = 0, valid_extensions = 0; 305 u8 *block, *new; 306 307 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 308 return NULL; 309 310 /* base block fetch */ 311 for (i = 0; i < 4; i++) { 312 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 313 goto out; 314 if (drm_edid_block_valid(block, 0)) 315 break; 316 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 317 connector->null_edid_counter++; 318 goto carp; 319 } 320 } 321 if (i == 4) 322 goto carp; 323 324 /* if there's no extensions, we're done */ 325 if (block[0x7e] == 0) 326 return block; 327 328 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 329 if (!new) 330 goto out; 331 block = new; 332 333 for (j = 1; j <= block[0x7e]; j++) { 334 for (i = 0; i < 4; i++) { 335 if (drm_do_probe_ddc_edid(adapter, 336 block + (valid_extensions + 1) * EDID_LENGTH, 337 j, EDID_LENGTH)) 338 goto out; 339 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j)) { 340 valid_extensions++; 341 break; 342 } 343 } 344 if (i == 4) 345 dev_warn(connector->dev->dev, 346 "%s: Ignoring invalid EDID block %d.\n", 347 drm_get_connector_name(connector), j); 348 } 349 350 if (valid_extensions != block[0x7e]) { 351 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 352 block[0x7e] = valid_extensions; 353 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 354 if (!new) 355 goto out; 356 block = new; 357 } 358 359 return block; 360 361 carp: 362 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 363 drm_get_connector_name(connector), j); 364 365 out: 366 kfree(block); 367 return NULL; 368 } 369 370 /** 371 * Probe DDC presence. 372 * 373 * \param adapter : i2c device adaptor 374 * \return 1 on success 375 */ 376 static bool 377 drm_probe_ddc(struct i2c_adapter *adapter) 378 { 379 unsigned char out; 380 381 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 382 } 383 384 /** 385 * drm_get_edid - get EDID data, if available 386 * @connector: connector we're probing 387 * @adapter: i2c adapter to use for DDC 388 * 389 * Poke the given i2c channel to grab EDID data if possible. If found, 390 * attach it to the connector. 391 * 392 * Return edid data or NULL if we couldn't find any. 393 */ 394 struct edid *drm_get_edid(struct drm_connector *connector, 395 struct i2c_adapter *adapter) 396 { 397 struct edid *edid = NULL; 398 399 if (drm_probe_ddc(adapter)) 400 edid = (struct edid *)drm_do_get_edid(connector, adapter); 401 402 connector->display_info.raw_edid = (char *)edid; 403 404 return edid; 405 406 } 407 EXPORT_SYMBOL(drm_get_edid); 408 409 /*** EDID parsing ***/ 410 411 /** 412 * edid_vendor - match a string against EDID's obfuscated vendor field 413 * @edid: EDID to match 414 * @vendor: vendor string 415 * 416 * Returns true if @vendor is in @edid, false otherwise 417 */ 418 static bool edid_vendor(struct edid *edid, char *vendor) 419 { 420 char edid_vendor[3]; 421 422 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 423 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 424 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 425 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 426 427 return !strncmp(edid_vendor, vendor, 3); 428 } 429 430 /** 431 * edid_get_quirks - return quirk flags for a given EDID 432 * @edid: EDID to process 433 * 434 * This tells subsequent routines what fixes they need to apply. 435 */ 436 static u32 edid_get_quirks(struct edid *edid) 437 { 438 struct edid_quirk *quirk; 439 int i; 440 441 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 442 quirk = &edid_quirk_list[i]; 443 444 if (edid_vendor(edid, quirk->vendor) && 445 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 446 return quirk->quirks; 447 } 448 449 return 0; 450 } 451 452 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 453 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 454 455 /** 456 * edid_fixup_preferred - set preferred modes based on quirk list 457 * @connector: has mode list to fix up 458 * @quirks: quirks list 459 * 460 * Walk the mode list for @connector, clearing the preferred status 461 * on existing modes and setting it anew for the right mode ala @quirks. 462 */ 463 static void edid_fixup_preferred(struct drm_connector *connector, 464 u32 quirks) 465 { 466 struct drm_display_mode *t, *cur_mode, *preferred_mode; 467 int target_refresh = 0; 468 469 if (list_empty(&connector->probed_modes)) 470 return; 471 472 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 473 target_refresh = 60; 474 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 475 target_refresh = 75; 476 477 preferred_mode = list_first_entry(&connector->probed_modes, 478 struct drm_display_mode, head); 479 480 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 481 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 482 483 if (cur_mode == preferred_mode) 484 continue; 485 486 /* Largest mode is preferred */ 487 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 488 preferred_mode = cur_mode; 489 490 /* At a given size, try to get closest to target refresh */ 491 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 492 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 493 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 494 preferred_mode = cur_mode; 495 } 496 } 497 498 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 499 } 500 501 static bool 502 mode_is_rb(const struct drm_display_mode *mode) 503 { 504 return (mode->htotal - mode->hdisplay == 160) && 505 (mode->hsync_end - mode->hdisplay == 80) && 506 (mode->hsync_end - mode->hsync_start == 32) && 507 (mode->vsync_start - mode->vdisplay == 3); 508 } 509 510 /* 511 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 512 * @dev: Device to duplicate against 513 * @hsize: Mode width 514 * @vsize: Mode height 515 * @fresh: Mode refresh rate 516 * @rb: Mode reduced-blanking-ness 517 * 518 * Walk the DMT mode list looking for a match for the given parameters. 519 * Return a newly allocated copy of the mode, or NULL if not found. 520 */ 521 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 522 int hsize, int vsize, int fresh, 523 bool rb) 524 { 525 int i; 526 527 for (i = 0; i < drm_num_dmt_modes; i++) { 528 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 529 if (hsize != ptr->hdisplay) 530 continue; 531 if (vsize != ptr->vdisplay) 532 continue; 533 if (fresh != drm_mode_vrefresh(ptr)) 534 continue; 535 if (rb != mode_is_rb(ptr)) 536 continue; 537 538 return drm_mode_duplicate(dev, ptr); 539 } 540 541 return NULL; 542 } 543 EXPORT_SYMBOL(drm_mode_find_dmt); 544 545 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 546 547 static void 548 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 549 { 550 int i, n = 0; 551 u8 d = ext[0x02]; 552 u8 *det_base = ext + d; 553 554 n = (127 - d) / 18; 555 for (i = 0; i < n; i++) 556 cb((struct detailed_timing *)(det_base + 18 * i), closure); 557 } 558 559 static void 560 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 561 { 562 unsigned int i, n = min((int)ext[0x02], 6); 563 u8 *det_base = ext + 5; 564 565 if (ext[0x01] != 1) 566 return; /* unknown version */ 567 568 for (i = 0; i < n; i++) 569 cb((struct detailed_timing *)(det_base + 18 * i), closure); 570 } 571 572 static void 573 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 574 { 575 int i; 576 struct edid *edid = (struct edid *)raw_edid; 577 578 if (edid == NULL) 579 return; 580 581 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 582 cb(&(edid->detailed_timings[i]), closure); 583 584 for (i = 1; i <= raw_edid[0x7e]; i++) { 585 u8 *ext = raw_edid + (i * EDID_LENGTH); 586 switch (*ext) { 587 case CEA_EXT: 588 cea_for_each_detailed_block(ext, cb, closure); 589 break; 590 case VTB_EXT: 591 vtb_for_each_detailed_block(ext, cb, closure); 592 break; 593 default: 594 break; 595 } 596 } 597 } 598 599 static void 600 is_rb(struct detailed_timing *t, void *data) 601 { 602 u8 *r = (u8 *)t; 603 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 604 if (r[15] & 0x10) 605 *(bool *)data = true; 606 } 607 608 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 609 static bool 610 drm_monitor_supports_rb(struct edid *edid) 611 { 612 if (edid->revision >= 4) { 613 bool ret; 614 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 615 return ret; 616 } 617 618 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 619 } 620 621 static void 622 find_gtf2(struct detailed_timing *t, void *data) 623 { 624 u8 *r = (u8 *)t; 625 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 626 *(u8 **)data = r; 627 } 628 629 /* Secondary GTF curve kicks in above some break frequency */ 630 static int 631 drm_gtf2_hbreak(struct edid *edid) 632 { 633 u8 *r = NULL; 634 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 635 return r ? (r[12] * 2) : 0; 636 } 637 638 static int 639 drm_gtf2_2c(struct edid *edid) 640 { 641 u8 *r = NULL; 642 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 643 return r ? r[13] : 0; 644 } 645 646 static int 647 drm_gtf2_m(struct edid *edid) 648 { 649 u8 *r = NULL; 650 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 651 return r ? (r[15] << 8) + r[14] : 0; 652 } 653 654 static int 655 drm_gtf2_k(struct edid *edid) 656 { 657 u8 *r = NULL; 658 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 659 return r ? r[16] : 0; 660 } 661 662 static int 663 drm_gtf2_2j(struct edid *edid) 664 { 665 u8 *r = NULL; 666 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 667 return r ? r[17] : 0; 668 } 669 670 /** 671 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 672 * @edid: EDID block to scan 673 */ 674 static int standard_timing_level(struct edid *edid) 675 { 676 if (edid->revision >= 2) { 677 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 678 return LEVEL_CVT; 679 if (drm_gtf2_hbreak(edid)) 680 return LEVEL_GTF2; 681 return LEVEL_GTF; 682 } 683 return LEVEL_DMT; 684 } 685 686 /* 687 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 688 * monitors fill with ascii space (0x20) instead. 689 */ 690 static int 691 bad_std_timing(u8 a, u8 b) 692 { 693 return (a == 0x00 && b == 0x00) || 694 (a == 0x01 && b == 0x01) || 695 (a == 0x20 && b == 0x20); 696 } 697 698 /** 699 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 700 * @t: standard timing params 701 * @timing_level: standard timing level 702 * 703 * Take the standard timing params (in this case width, aspect, and refresh) 704 * and convert them into a real mode using CVT/GTF/DMT. 705 */ 706 static struct drm_display_mode * 707 drm_mode_std(struct drm_connector *connector, struct edid *edid, 708 struct std_timing *t, int revision) 709 { 710 struct drm_device *dev = connector->dev; 711 struct drm_display_mode *m, *mode = NULL; 712 int hsize, vsize; 713 int vrefresh_rate; 714 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 715 >> EDID_TIMING_ASPECT_SHIFT; 716 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 717 >> EDID_TIMING_VFREQ_SHIFT; 718 int timing_level = standard_timing_level(edid); 719 720 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 721 return NULL; 722 723 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 724 hsize = t->hsize * 8 + 248; 725 /* vrefresh_rate = vfreq + 60 */ 726 vrefresh_rate = vfreq + 60; 727 /* the vdisplay is calculated based on the aspect ratio */ 728 if (aspect_ratio == 0) { 729 if (revision < 3) 730 vsize = hsize; 731 else 732 vsize = (hsize * 10) / 16; 733 } else if (aspect_ratio == 1) 734 vsize = (hsize * 3) / 4; 735 else if (aspect_ratio == 2) 736 vsize = (hsize * 4) / 5; 737 else 738 vsize = (hsize * 9) / 16; 739 740 /* HDTV hack, part 1 */ 741 if (vrefresh_rate == 60 && 742 ((hsize == 1360 && vsize == 765) || 743 (hsize == 1368 && vsize == 769))) { 744 hsize = 1366; 745 vsize = 768; 746 } 747 748 /* 749 * If this connector already has a mode for this size and refresh 750 * rate (because it came from detailed or CVT info), use that 751 * instead. This way we don't have to guess at interlace or 752 * reduced blanking. 753 */ 754 list_for_each_entry(m, &connector->probed_modes, head) 755 if (m->hdisplay == hsize && m->vdisplay == vsize && 756 drm_mode_vrefresh(m) == vrefresh_rate) 757 return NULL; 758 759 /* HDTV hack, part 2 */ 760 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 761 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 762 false); 763 mode->hdisplay = 1366; 764 mode->hsync_start = mode->hsync_start - 1; 765 mode->hsync_end = mode->hsync_end - 1; 766 return mode; 767 } 768 769 /* check whether it can be found in default mode table */ 770 if (drm_monitor_supports_rb(edid)) { 771 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, 772 true); 773 if (mode) 774 return mode; 775 } 776 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false); 777 if (mode) 778 return mode; 779 780 /* okay, generate it */ 781 switch (timing_level) { 782 case LEVEL_DMT: 783 break; 784 case LEVEL_GTF: 785 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 786 break; 787 case LEVEL_GTF2: 788 /* 789 * This is potentially wrong if there's ever a monitor with 790 * more than one ranges section, each claiming a different 791 * secondary GTF curve. Please don't do that. 792 */ 793 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 794 if (!mode) 795 return NULL; 796 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 797 drm_mode_destroy(dev, mode); 798 mode = drm_gtf_mode_complex(dev, hsize, vsize, 799 vrefresh_rate, 0, 0, 800 drm_gtf2_m(edid), 801 drm_gtf2_2c(edid), 802 drm_gtf2_k(edid), 803 drm_gtf2_2j(edid)); 804 } 805 break; 806 case LEVEL_CVT: 807 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 808 false); 809 break; 810 } 811 return mode; 812 } 813 814 /* 815 * EDID is delightfully ambiguous about how interlaced modes are to be 816 * encoded. Our internal representation is of frame height, but some 817 * HDTV detailed timings are encoded as field height. 818 * 819 * The format list here is from CEA, in frame size. Technically we 820 * should be checking refresh rate too. Whatever. 821 */ 822 static void 823 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 824 struct detailed_pixel_timing *pt) 825 { 826 int i; 827 static const struct { 828 int w, h; 829 } cea_interlaced[] = { 830 { 1920, 1080 }, 831 { 720, 480 }, 832 { 1440, 480 }, 833 { 2880, 480 }, 834 { 720, 576 }, 835 { 1440, 576 }, 836 { 2880, 576 }, 837 }; 838 839 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 840 return; 841 842 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 843 if ((mode->hdisplay == cea_interlaced[i].w) && 844 (mode->vdisplay == cea_interlaced[i].h / 2)) { 845 mode->vdisplay *= 2; 846 mode->vsync_start *= 2; 847 mode->vsync_end *= 2; 848 mode->vtotal *= 2; 849 mode->vtotal |= 1; 850 } 851 } 852 853 mode->flags |= DRM_MODE_FLAG_INTERLACE; 854 } 855 856 /** 857 * drm_mode_detailed - create a new mode from an EDID detailed timing section 858 * @dev: DRM device (needed to create new mode) 859 * @edid: EDID block 860 * @timing: EDID detailed timing info 861 * @quirks: quirks to apply 862 * 863 * An EDID detailed timing block contains enough info for us to create and 864 * return a new struct drm_display_mode. 865 */ 866 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 867 struct edid *edid, 868 struct detailed_timing *timing, 869 u32 quirks) 870 { 871 struct drm_display_mode *mode; 872 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 873 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 874 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 875 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 876 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 877 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 878 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 879 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 880 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 881 882 /* ignore tiny modes */ 883 if (hactive < 64 || vactive < 64) 884 return NULL; 885 886 if (pt->misc & DRM_EDID_PT_STEREO) { 887 printk(KERN_WARNING "stereo mode not supported\n"); 888 return NULL; 889 } 890 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 891 printk(KERN_WARNING "composite sync not supported\n"); 892 } 893 894 /* it is incorrect if hsync/vsync width is zero */ 895 if (!hsync_pulse_width || !vsync_pulse_width) { 896 DRM_DEBUG_KMS("Incorrect Detailed timing. " 897 "Wrong Hsync/Vsync pulse width\n"); 898 return NULL; 899 } 900 901 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) { 902 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false); 903 if (!mode) 904 return NULL; 905 906 goto set_size; 907 } 908 909 mode = drm_mode_create(dev); 910 if (!mode) 911 return NULL; 912 913 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 914 timing->pixel_clock = cpu_to_le16(1088); 915 916 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 917 918 mode->hdisplay = hactive; 919 mode->hsync_start = mode->hdisplay + hsync_offset; 920 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 921 mode->htotal = mode->hdisplay + hblank; 922 923 mode->vdisplay = vactive; 924 mode->vsync_start = mode->vdisplay + vsync_offset; 925 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 926 mode->vtotal = mode->vdisplay + vblank; 927 928 /* Some EDIDs have bogus h/vtotal values */ 929 if (mode->hsync_end > mode->htotal) 930 mode->htotal = mode->hsync_end + 1; 931 if (mode->vsync_end > mode->vtotal) 932 mode->vtotal = mode->vsync_end + 1; 933 934 drm_mode_do_interlace_quirk(mode, pt); 935 936 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 937 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 938 } 939 940 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 941 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 942 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 943 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 944 945 set_size: 946 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 947 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 948 949 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 950 mode->width_mm *= 10; 951 mode->height_mm *= 10; 952 } 953 954 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 955 mode->width_mm = edid->width_cm * 10; 956 mode->height_mm = edid->height_cm * 10; 957 } 958 959 mode->type = DRM_MODE_TYPE_DRIVER; 960 drm_mode_set_name(mode); 961 962 return mode; 963 } 964 965 static bool 966 mode_in_hsync_range(const struct drm_display_mode *mode, 967 struct edid *edid, u8 *t) 968 { 969 int hsync, hmin, hmax; 970 971 hmin = t[7]; 972 if (edid->revision >= 4) 973 hmin += ((t[4] & 0x04) ? 255 : 0); 974 hmax = t[8]; 975 if (edid->revision >= 4) 976 hmax += ((t[4] & 0x08) ? 255 : 0); 977 hsync = drm_mode_hsync(mode); 978 979 return (hsync <= hmax && hsync >= hmin); 980 } 981 982 static bool 983 mode_in_vsync_range(const struct drm_display_mode *mode, 984 struct edid *edid, u8 *t) 985 { 986 int vsync, vmin, vmax; 987 988 vmin = t[5]; 989 if (edid->revision >= 4) 990 vmin += ((t[4] & 0x01) ? 255 : 0); 991 vmax = t[6]; 992 if (edid->revision >= 4) 993 vmax += ((t[4] & 0x02) ? 255 : 0); 994 vsync = drm_mode_vrefresh(mode); 995 996 return (vsync <= vmax && vsync >= vmin); 997 } 998 999 static u32 1000 range_pixel_clock(struct edid *edid, u8 *t) 1001 { 1002 /* unspecified */ 1003 if (t[9] == 0 || t[9] == 255) 1004 return 0; 1005 1006 /* 1.4 with CVT support gives us real precision, yay */ 1007 if (edid->revision >= 4 && t[10] == 0x04) 1008 return (t[9] * 10000) - ((t[12] >> 2) * 250); 1009 1010 /* 1.3 is pathetic, so fuzz up a bit */ 1011 return t[9] * 10000 + 5001; 1012 } 1013 1014 static bool 1015 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 1016 struct detailed_timing *timing) 1017 { 1018 u32 max_clock; 1019 u8 *t = (u8 *)timing; 1020 1021 if (!mode_in_hsync_range(mode, edid, t)) 1022 return false; 1023 1024 if (!mode_in_vsync_range(mode, edid, t)) 1025 return false; 1026 1027 if ((max_clock = range_pixel_clock(edid, t))) 1028 if (mode->clock > max_clock) 1029 return false; 1030 1031 /* 1.4 max horizontal check */ 1032 if (edid->revision >= 4 && t[10] == 0x04) 1033 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1034 return false; 1035 1036 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1037 return false; 1038 1039 return true; 1040 } 1041 1042 static int 1043 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1044 struct detailed_timing *timing) 1045 { 1046 int i, modes = 0; 1047 struct drm_display_mode *newmode; 1048 struct drm_device *dev = connector->dev; 1049 1050 for (i = 0; i < drm_num_dmt_modes; i++) { 1051 if (mode_in_range(drm_dmt_modes + i, edid, timing)) { 1052 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1053 if (newmode) { 1054 drm_mode_probed_add(connector, newmode); 1055 modes++; 1056 } 1057 } 1058 } 1059 1060 return modes; 1061 } 1062 1063 /* fix up 1366x768 mode from 1368x768; 1064 * GFT/CVT can't express 1366 width which isn't dividable by 8 1065 */ 1066 static void fixup_mode_1366x768(struct drm_display_mode *mode) 1067 { 1068 if (mode->hdisplay == 1368 && mode->vdisplay == 768) { 1069 mode->hdisplay = 1366; 1070 mode->hsync_start--; 1071 mode->hsync_end--; 1072 drm_mode_set_name(mode); 1073 } 1074 } 1075 1076 static int 1077 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1078 struct detailed_timing *timing) 1079 { 1080 int i, modes = 0; 1081 struct drm_display_mode *newmode; 1082 struct drm_device *dev = connector->dev; 1083 1084 for (i = 0; i < num_extra_modes; i++) { 1085 const struct minimode *m = &extra_modes[i]; 1086 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0); 1087 if (!newmode) 1088 return modes; 1089 1090 fixup_mode_1366x768(newmode); 1091 if (!mode_in_range(newmode, edid, timing)) { 1092 drm_mode_destroy(dev, newmode); 1093 continue; 1094 } 1095 1096 drm_mode_probed_add(connector, newmode); 1097 modes++; 1098 } 1099 1100 return modes; 1101 } 1102 1103 static int 1104 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1105 struct detailed_timing *timing) 1106 { 1107 int i, modes = 0; 1108 struct drm_display_mode *newmode; 1109 struct drm_device *dev = connector->dev; 1110 bool rb = drm_monitor_supports_rb(edid); 1111 1112 for (i = 0; i < num_extra_modes; i++) { 1113 const struct minimode *m = &extra_modes[i]; 1114 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0); 1115 if (!newmode) 1116 return modes; 1117 1118 fixup_mode_1366x768(newmode); 1119 if (!mode_in_range(newmode, edid, timing)) { 1120 drm_mode_destroy(dev, newmode); 1121 continue; 1122 } 1123 1124 drm_mode_probed_add(connector, newmode); 1125 modes++; 1126 } 1127 1128 return modes; 1129 } 1130 1131 static void 1132 do_inferred_modes(struct detailed_timing *timing, void *c) 1133 { 1134 struct detailed_mode_closure *closure = c; 1135 struct detailed_non_pixel *data = &timing->data.other_data; 1136 struct detailed_data_monitor_range *range = &data->data.range; 1137 1138 if (data->type != EDID_DETAIL_MONITOR_RANGE) 1139 return; 1140 1141 closure->modes += drm_dmt_modes_for_range(closure->connector, 1142 closure->edid, 1143 timing); 1144 1145 if (!version_greater(closure->edid, 1, 1)) 1146 return; /* GTF not defined yet */ 1147 1148 switch (range->flags) { 1149 case 0x02: /* secondary gtf, XXX could do more */ 1150 case 0x00: /* default gtf */ 1151 closure->modes += drm_gtf_modes_for_range(closure->connector, 1152 closure->edid, 1153 timing); 1154 break; 1155 case 0x04: /* cvt, only in 1.4+ */ 1156 if (!version_greater(closure->edid, 1, 3)) 1157 break; 1158 1159 closure->modes += drm_cvt_modes_for_range(closure->connector, 1160 closure->edid, 1161 timing); 1162 break; 1163 case 0x01: /* just the ranges, no formula */ 1164 default: 1165 break; 1166 } 1167 } 1168 1169 static int 1170 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1171 { 1172 struct detailed_mode_closure closure = { 1173 connector, edid, 0, 0, 0 1174 }; 1175 1176 if (version_greater(edid, 1, 0)) 1177 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1178 &closure); 1179 1180 return closure.modes; 1181 } 1182 1183 static int 1184 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1185 { 1186 int i, j, m, modes = 0; 1187 struct drm_display_mode *mode; 1188 u8 *est = ((u8 *)timing) + 5; 1189 1190 for (i = 0; i < 6; i++) { 1191 for (j = 7; j > 0; j--) { 1192 m = (i * 8) + (7 - j); 1193 if (m >= ARRAY_SIZE(est3_modes)) 1194 break; 1195 if (est[i] & (1 << j)) { 1196 mode = drm_mode_find_dmt(connector->dev, 1197 est3_modes[m].w, 1198 est3_modes[m].h, 1199 est3_modes[m].r, 1200 est3_modes[m].rb); 1201 if (mode) { 1202 drm_mode_probed_add(connector, mode); 1203 modes++; 1204 } 1205 } 1206 } 1207 } 1208 1209 return modes; 1210 } 1211 1212 static void 1213 do_established_modes(struct detailed_timing *timing, void *c) 1214 { 1215 struct detailed_mode_closure *closure = c; 1216 struct detailed_non_pixel *data = &timing->data.other_data; 1217 1218 if (data->type == EDID_DETAIL_EST_TIMINGS) 1219 closure->modes += drm_est3_modes(closure->connector, timing); 1220 } 1221 1222 /** 1223 * add_established_modes - get est. modes from EDID and add them 1224 * @edid: EDID block to scan 1225 * 1226 * Each EDID block contains a bitmap of the supported "established modes" list 1227 * (defined above). Tease them out and add them to the global modes list. 1228 */ 1229 static int 1230 add_established_modes(struct drm_connector *connector, struct edid *edid) 1231 { 1232 struct drm_device *dev = connector->dev; 1233 unsigned long est_bits = edid->established_timings.t1 | 1234 (edid->established_timings.t2 << 8) | 1235 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1236 int i, modes = 0; 1237 struct detailed_mode_closure closure = { 1238 connector, edid, 0, 0, 0 1239 }; 1240 1241 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1242 if (est_bits & (1<<i)) { 1243 struct drm_display_mode *newmode; 1244 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1245 if (newmode) { 1246 drm_mode_probed_add(connector, newmode); 1247 modes++; 1248 } 1249 } 1250 } 1251 1252 if (version_greater(edid, 1, 0)) 1253 drm_for_each_detailed_block((u8 *)edid, 1254 do_established_modes, &closure); 1255 1256 return modes + closure.modes; 1257 } 1258 1259 static void 1260 do_standard_modes(struct detailed_timing *timing, void *c) 1261 { 1262 struct detailed_mode_closure *closure = c; 1263 struct detailed_non_pixel *data = &timing->data.other_data; 1264 struct drm_connector *connector = closure->connector; 1265 struct edid *edid = closure->edid; 1266 1267 if (data->type == EDID_DETAIL_STD_MODES) { 1268 int i; 1269 for (i = 0; i < 6; i++) { 1270 struct std_timing *std; 1271 struct drm_display_mode *newmode; 1272 1273 std = &data->data.timings[i]; 1274 newmode = drm_mode_std(connector, edid, std, 1275 edid->revision); 1276 if (newmode) { 1277 drm_mode_probed_add(connector, newmode); 1278 closure->modes++; 1279 } 1280 } 1281 } 1282 } 1283 1284 /** 1285 * add_standard_modes - get std. modes from EDID and add them 1286 * @edid: EDID block to scan 1287 * 1288 * Standard modes can be calculated using the appropriate standard (DMT, 1289 * GTF or CVT. Grab them from @edid and add them to the list. 1290 */ 1291 static int 1292 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1293 { 1294 int i, modes = 0; 1295 struct detailed_mode_closure closure = { 1296 connector, edid, 0, 0, 0 1297 }; 1298 1299 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1300 struct drm_display_mode *newmode; 1301 1302 newmode = drm_mode_std(connector, edid, 1303 &edid->standard_timings[i], 1304 edid->revision); 1305 if (newmode) { 1306 drm_mode_probed_add(connector, newmode); 1307 modes++; 1308 } 1309 } 1310 1311 if (version_greater(edid, 1, 0)) 1312 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1313 &closure); 1314 1315 /* XXX should also look for standard codes in VTB blocks */ 1316 1317 return modes + closure.modes; 1318 } 1319 1320 static int drm_cvt_modes(struct drm_connector *connector, 1321 struct detailed_timing *timing) 1322 { 1323 int i, j, modes = 0; 1324 struct drm_display_mode *newmode; 1325 struct drm_device *dev = connector->dev; 1326 struct cvt_timing *cvt; 1327 const int rates[] = { 60, 85, 75, 60, 50 }; 1328 const u8 empty[3] = { 0, 0, 0 }; 1329 1330 for (i = 0; i < 4; i++) { 1331 int uninitialized_var(width), height; 1332 cvt = &(timing->data.other_data.data.cvt[i]); 1333 1334 if (!memcmp(cvt->code, empty, 3)) 1335 continue; 1336 1337 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1338 switch (cvt->code[1] & 0x0c) { 1339 case 0x00: 1340 width = height * 4 / 3; 1341 break; 1342 case 0x04: 1343 width = height * 16 / 9; 1344 break; 1345 case 0x08: 1346 width = height * 16 / 10; 1347 break; 1348 case 0x0c: 1349 width = height * 15 / 9; 1350 break; 1351 } 1352 1353 for (j = 1; j < 5; j++) { 1354 if (cvt->code[2] & (1 << j)) { 1355 newmode = drm_cvt_mode(dev, width, height, 1356 rates[j], j == 0, 1357 false, false); 1358 if (newmode) { 1359 drm_mode_probed_add(connector, newmode); 1360 modes++; 1361 } 1362 } 1363 } 1364 } 1365 1366 return modes; 1367 } 1368 1369 static void 1370 do_cvt_mode(struct detailed_timing *timing, void *c) 1371 { 1372 struct detailed_mode_closure *closure = c; 1373 struct detailed_non_pixel *data = &timing->data.other_data; 1374 1375 if (data->type == EDID_DETAIL_CVT_3BYTE) 1376 closure->modes += drm_cvt_modes(closure->connector, timing); 1377 } 1378 1379 static int 1380 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1381 { 1382 struct detailed_mode_closure closure = { 1383 connector, edid, 0, 0, 0 1384 }; 1385 1386 if (version_greater(edid, 1, 2)) 1387 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1388 1389 /* XXX should also look for CVT codes in VTB blocks */ 1390 1391 return closure.modes; 1392 } 1393 1394 static void 1395 do_detailed_mode(struct detailed_timing *timing, void *c) 1396 { 1397 struct detailed_mode_closure *closure = c; 1398 struct drm_display_mode *newmode; 1399 1400 if (timing->pixel_clock) { 1401 newmode = drm_mode_detailed(closure->connector->dev, 1402 closure->edid, timing, 1403 closure->quirks); 1404 if (!newmode) 1405 return; 1406 1407 if (closure->preferred) 1408 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1409 1410 drm_mode_probed_add(closure->connector, newmode); 1411 closure->modes++; 1412 closure->preferred = 0; 1413 } 1414 } 1415 1416 /* 1417 * add_detailed_modes - Add modes from detailed timings 1418 * @connector: attached connector 1419 * @edid: EDID block to scan 1420 * @quirks: quirks to apply 1421 */ 1422 static int 1423 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1424 u32 quirks) 1425 { 1426 struct detailed_mode_closure closure = { 1427 connector, 1428 edid, 1429 1, 1430 quirks, 1431 0 1432 }; 1433 1434 if (closure.preferred && !version_greater(edid, 1, 3)) 1435 closure.preferred = 1436 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1437 1438 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1439 1440 return closure.modes; 1441 } 1442 1443 #define HDMI_IDENTIFIER 0x000C03 1444 #define AUDIO_BLOCK 0x01 1445 #define VIDEO_BLOCK 0x02 1446 #define VENDOR_BLOCK 0x03 1447 #define SPEAKER_BLOCK 0x04 1448 #define EDID_BASIC_AUDIO (1 << 6) 1449 #define EDID_CEA_YCRCB444 (1 << 5) 1450 #define EDID_CEA_YCRCB422 (1 << 4) 1451 1452 /** 1453 * Search EDID for CEA extension block. 1454 */ 1455 u8 *drm_find_cea_extension(struct edid *edid) 1456 { 1457 u8 *edid_ext = NULL; 1458 int i; 1459 1460 /* No EDID or EDID extensions */ 1461 if (edid == NULL || edid->extensions == 0) 1462 return NULL; 1463 1464 /* Find CEA extension */ 1465 for (i = 0; i < edid->extensions; i++) { 1466 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1467 if (edid_ext[0] == CEA_EXT) 1468 break; 1469 } 1470 1471 if (i == edid->extensions) 1472 return NULL; 1473 1474 return edid_ext; 1475 } 1476 EXPORT_SYMBOL(drm_find_cea_extension); 1477 1478 static int 1479 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1480 { 1481 struct drm_device *dev = connector->dev; 1482 u8 * mode, cea_mode; 1483 int modes = 0; 1484 1485 for (mode = db; mode < db + len; mode++) { 1486 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1487 if (cea_mode < drm_num_cea_modes) { 1488 struct drm_display_mode *newmode; 1489 newmode = drm_mode_duplicate(dev, 1490 &edid_cea_modes[cea_mode]); 1491 if (newmode) { 1492 drm_mode_probed_add(connector, newmode); 1493 modes++; 1494 } 1495 } 1496 } 1497 1498 return modes; 1499 } 1500 1501 static int 1502 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1503 { 1504 u8 * cea = drm_find_cea_extension(edid); 1505 u8 * db, dbl; 1506 int modes = 0; 1507 1508 if (cea && cea[1] >= 3) { 1509 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1510 dbl = db[0] & 0x1f; 1511 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK) 1512 modes += do_cea_modes (connector, db+1, dbl); 1513 } 1514 } 1515 1516 return modes; 1517 } 1518 1519 static void 1520 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1521 { 1522 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1523 1524 connector->dvi_dual = db[6] & 1; 1525 connector->max_tmds_clock = db[7] * 5; 1526 1527 connector->latency_present[0] = db[8] >> 7; 1528 connector->latency_present[1] = (db[8] >> 6) & 1; 1529 connector->video_latency[0] = db[9]; 1530 connector->audio_latency[0] = db[10]; 1531 connector->video_latency[1] = db[11]; 1532 connector->audio_latency[1] = db[12]; 1533 1534 DRM_LOG_KMS("HDMI: DVI dual %d, " 1535 "max TMDS clock %d, " 1536 "latency present %d %d, " 1537 "video latency %d %d, " 1538 "audio latency %d %d\n", 1539 connector->dvi_dual, 1540 connector->max_tmds_clock, 1541 (int) connector->latency_present[0], 1542 (int) connector->latency_present[1], 1543 connector->video_latency[0], 1544 connector->video_latency[1], 1545 connector->audio_latency[0], 1546 connector->audio_latency[1]); 1547 } 1548 1549 static void 1550 monitor_name(struct detailed_timing *t, void *data) 1551 { 1552 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1553 *(u8 **)data = t->data.other_data.data.str.str; 1554 } 1555 1556 /** 1557 * drm_edid_to_eld - build ELD from EDID 1558 * @connector: connector corresponding to the HDMI/DP sink 1559 * @edid: EDID to parse 1560 * 1561 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1562 * Some ELD fields are left to the graphics driver caller: 1563 * - Conn_Type 1564 * - HDCP 1565 * - Port_ID 1566 */ 1567 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1568 { 1569 uint8_t *eld = connector->eld; 1570 u8 *cea; 1571 u8 *name; 1572 u8 *db; 1573 int sad_count = 0; 1574 int mnl; 1575 int dbl; 1576 1577 memset(eld, 0, sizeof(connector->eld)); 1578 1579 cea = drm_find_cea_extension(edid); 1580 if (!cea) { 1581 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1582 return; 1583 } 1584 1585 name = NULL; 1586 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1587 for (mnl = 0; name && mnl < 13; mnl++) { 1588 if (name[mnl] == 0x0a) 1589 break; 1590 eld[20 + mnl] = name[mnl]; 1591 } 1592 eld[4] = (cea[1] << 5) | mnl; 1593 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1594 1595 eld[0] = 2 << 3; /* ELD version: 2 */ 1596 1597 eld[16] = edid->mfg_id[0]; 1598 eld[17] = edid->mfg_id[1]; 1599 eld[18] = edid->prod_code[0]; 1600 eld[19] = edid->prod_code[1]; 1601 1602 if (cea[1] >= 3) 1603 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1604 dbl = db[0] & 0x1f; 1605 1606 switch ((db[0] & 0xe0) >> 5) { 1607 case AUDIO_BLOCK: 1608 /* Audio Data Block, contains SADs */ 1609 sad_count = dbl / 3; 1610 memcpy(eld + 20 + mnl, &db[1], dbl); 1611 break; 1612 case SPEAKER_BLOCK: 1613 /* Speaker Allocation Data Block */ 1614 eld[7] = db[1]; 1615 break; 1616 case VENDOR_BLOCK: 1617 /* HDMI Vendor-Specific Data Block */ 1618 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1619 parse_hdmi_vsdb(connector, db); 1620 break; 1621 default: 1622 break; 1623 } 1624 } 1625 eld[5] |= sad_count << 4; 1626 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1627 1628 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1629 } 1630 EXPORT_SYMBOL(drm_edid_to_eld); 1631 1632 /** 1633 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1634 * @connector: connector associated with the HDMI/DP sink 1635 * @mode: the display mode 1636 */ 1637 int drm_av_sync_delay(struct drm_connector *connector, 1638 struct drm_display_mode *mode) 1639 { 1640 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1641 int a, v; 1642 1643 if (!connector->latency_present[0]) 1644 return 0; 1645 if (!connector->latency_present[1]) 1646 i = 0; 1647 1648 a = connector->audio_latency[i]; 1649 v = connector->video_latency[i]; 1650 1651 /* 1652 * HDMI/DP sink doesn't support audio or video? 1653 */ 1654 if (a == 255 || v == 255) 1655 return 0; 1656 1657 /* 1658 * Convert raw EDID values to millisecond. 1659 * Treat unknown latency as 0ms. 1660 */ 1661 if (a) 1662 a = min(2 * (a - 1), 500); 1663 if (v) 1664 v = min(2 * (v - 1), 500); 1665 1666 return max(v - a, 0); 1667 } 1668 EXPORT_SYMBOL(drm_av_sync_delay); 1669 1670 /** 1671 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1672 * @encoder: the encoder just changed display mode 1673 * @mode: the adjusted display mode 1674 * 1675 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1676 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1677 */ 1678 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1679 struct drm_display_mode *mode) 1680 { 1681 struct drm_connector *connector; 1682 struct drm_device *dev = encoder->dev; 1683 1684 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1685 if (connector->encoder == encoder && connector->eld[0]) 1686 return connector; 1687 1688 return NULL; 1689 } 1690 EXPORT_SYMBOL(drm_select_eld); 1691 1692 /** 1693 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1694 * @edid: monitor EDID information 1695 * 1696 * Parse the CEA extension according to CEA-861-B. 1697 * Return true if HDMI, false if not or unknown. 1698 */ 1699 bool drm_detect_hdmi_monitor(struct edid *edid) 1700 { 1701 u8 *edid_ext; 1702 int i, hdmi_id; 1703 int start_offset, end_offset; 1704 bool is_hdmi = false; 1705 1706 edid_ext = drm_find_cea_extension(edid); 1707 if (!edid_ext) 1708 goto end; 1709 1710 /* Data block offset in CEA extension block */ 1711 start_offset = 4; 1712 end_offset = edid_ext[2]; 1713 1714 /* 1715 * Because HDMI identifier is in Vendor Specific Block, 1716 * search it from all data blocks of CEA extension. 1717 */ 1718 for (i = start_offset; i < end_offset; 1719 /* Increased by data block len */ 1720 i += ((edid_ext[i] & 0x1f) + 1)) { 1721 /* Find vendor specific block */ 1722 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1723 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1724 edid_ext[i + 3] << 16; 1725 /* Find HDMI identifier */ 1726 if (hdmi_id == HDMI_IDENTIFIER) 1727 is_hdmi = true; 1728 break; 1729 } 1730 } 1731 1732 end: 1733 return is_hdmi; 1734 } 1735 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1736 1737 /** 1738 * drm_detect_monitor_audio - check monitor audio capability 1739 * 1740 * Monitor should have CEA extension block. 1741 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1742 * audio' only. If there is any audio extension block and supported 1743 * audio format, assume at least 'basic audio' support, even if 'basic 1744 * audio' is not defined in EDID. 1745 * 1746 */ 1747 bool drm_detect_monitor_audio(struct edid *edid) 1748 { 1749 u8 *edid_ext; 1750 int i, j; 1751 bool has_audio = false; 1752 int start_offset, end_offset; 1753 1754 edid_ext = drm_find_cea_extension(edid); 1755 if (!edid_ext) 1756 goto end; 1757 1758 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1759 1760 if (has_audio) { 1761 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1762 goto end; 1763 } 1764 1765 /* Data block offset in CEA extension block */ 1766 start_offset = 4; 1767 end_offset = edid_ext[2]; 1768 1769 for (i = start_offset; i < end_offset; 1770 i += ((edid_ext[i] & 0x1f) + 1)) { 1771 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1772 has_audio = true; 1773 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1774 DRM_DEBUG_KMS("CEA audio format %d\n", 1775 (edid_ext[i + j] >> 3) & 0xf); 1776 goto end; 1777 } 1778 } 1779 end: 1780 return has_audio; 1781 } 1782 EXPORT_SYMBOL(drm_detect_monitor_audio); 1783 1784 /** 1785 * drm_add_display_info - pull display info out if present 1786 * @edid: EDID data 1787 * @info: display info (attached to connector) 1788 * 1789 * Grab any available display info and stuff it into the drm_display_info 1790 * structure that's part of the connector. Useful for tracking bpp and 1791 * color spaces. 1792 */ 1793 static void drm_add_display_info(struct edid *edid, 1794 struct drm_display_info *info) 1795 { 1796 u8 *edid_ext; 1797 1798 info->width_mm = edid->width_cm * 10; 1799 info->height_mm = edid->height_cm * 10; 1800 1801 /* driver figures it out in this case */ 1802 info->bpc = 0; 1803 info->color_formats = 0; 1804 1805 if (edid->revision < 3) 1806 return; 1807 1808 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1809 return; 1810 1811 /* Get data from CEA blocks if present */ 1812 edid_ext = drm_find_cea_extension(edid); 1813 if (edid_ext) { 1814 info->cea_rev = edid_ext[1]; 1815 1816 /* The existence of a CEA block should imply RGB support */ 1817 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1818 if (edid_ext[3] & EDID_CEA_YCRCB444) 1819 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1820 if (edid_ext[3] & EDID_CEA_YCRCB422) 1821 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1822 } 1823 1824 /* Only defined for 1.4 with digital displays */ 1825 if (edid->revision < 4) 1826 return; 1827 1828 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1829 case DRM_EDID_DIGITAL_DEPTH_6: 1830 info->bpc = 6; 1831 break; 1832 case DRM_EDID_DIGITAL_DEPTH_8: 1833 info->bpc = 8; 1834 break; 1835 case DRM_EDID_DIGITAL_DEPTH_10: 1836 info->bpc = 10; 1837 break; 1838 case DRM_EDID_DIGITAL_DEPTH_12: 1839 info->bpc = 12; 1840 break; 1841 case DRM_EDID_DIGITAL_DEPTH_14: 1842 info->bpc = 14; 1843 break; 1844 case DRM_EDID_DIGITAL_DEPTH_16: 1845 info->bpc = 16; 1846 break; 1847 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1848 default: 1849 info->bpc = 0; 1850 break; 1851 } 1852 1853 info->color_formats |= DRM_COLOR_FORMAT_RGB444; 1854 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444) 1855 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1856 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) 1857 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1858 } 1859 1860 /** 1861 * drm_add_edid_modes - add modes from EDID data, if available 1862 * @connector: connector we're probing 1863 * @edid: edid data 1864 * 1865 * Add the specified modes to the connector's mode list. 1866 * 1867 * Return number of modes added or 0 if we couldn't find any. 1868 */ 1869 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1870 { 1871 int num_modes = 0; 1872 u32 quirks; 1873 1874 if (edid == NULL) { 1875 return 0; 1876 } 1877 if (!drm_edid_is_valid(edid)) { 1878 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1879 drm_get_connector_name(connector)); 1880 return 0; 1881 } 1882 1883 quirks = edid_get_quirks(edid); 1884 1885 /* 1886 * EDID spec says modes should be preferred in this order: 1887 * - preferred detailed mode 1888 * - other detailed modes from base block 1889 * - detailed modes from extension blocks 1890 * - CVT 3-byte code modes 1891 * - standard timing codes 1892 * - established timing codes 1893 * - modes inferred from GTF or CVT range information 1894 * 1895 * We get this pretty much right. 1896 * 1897 * XXX order for additional mode types in extension blocks? 1898 */ 1899 num_modes += add_detailed_modes(connector, edid, quirks); 1900 num_modes += add_cvt_modes(connector, edid); 1901 num_modes += add_standard_modes(connector, edid); 1902 num_modes += add_established_modes(connector, edid); 1903 num_modes += add_inferred_modes(connector, edid); 1904 num_modes += add_cea_modes(connector, edid); 1905 1906 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1907 edid_fixup_preferred(connector, quirks); 1908 1909 drm_add_display_info(edid, &connector->display_info); 1910 1911 return num_modes; 1912 } 1913 EXPORT_SYMBOL(drm_add_edid_modes); 1914 1915 /** 1916 * drm_add_modes_noedid - add modes for the connectors without EDID 1917 * @connector: connector we're probing 1918 * @hdisplay: the horizontal display limit 1919 * @vdisplay: the vertical display limit 1920 * 1921 * Add the specified modes to the connector's mode list. Only when the 1922 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1923 * 1924 * Return number of modes added or 0 if we couldn't find any. 1925 */ 1926 int drm_add_modes_noedid(struct drm_connector *connector, 1927 int hdisplay, int vdisplay) 1928 { 1929 int i, count, num_modes = 0; 1930 struct drm_display_mode *mode; 1931 struct drm_device *dev = connector->dev; 1932 1933 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1934 if (hdisplay < 0) 1935 hdisplay = 0; 1936 if (vdisplay < 0) 1937 vdisplay = 0; 1938 1939 for (i = 0; i < count; i++) { 1940 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1941 if (hdisplay && vdisplay) { 1942 /* 1943 * Only when two are valid, they will be used to check 1944 * whether the mode should be added to the mode list of 1945 * the connector. 1946 */ 1947 if (ptr->hdisplay > hdisplay || 1948 ptr->vdisplay > vdisplay) 1949 continue; 1950 } 1951 if (drm_mode_vrefresh(ptr) > 61) 1952 continue; 1953 mode = drm_mode_duplicate(dev, ptr); 1954 if (mode) { 1955 drm_mode_probed_add(connector, mode); 1956 num_modes++; 1957 } 1958 } 1959 return num_modes; 1960 } 1961 EXPORT_SYMBOL(drm_add_modes_noedid); 1962