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 = false; 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 bool valid_inferred_mode(const struct drm_connector *connector, 1043 const struct drm_display_mode *mode) 1044 { 1045 struct drm_display_mode *m; 1046 bool ok = false; 1047 1048 list_for_each_entry(m, &connector->probed_modes, head) { 1049 if (mode->hdisplay == m->hdisplay && 1050 mode->vdisplay == m->vdisplay && 1051 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m)) 1052 return false; /* duplicated */ 1053 if (mode->hdisplay <= m->hdisplay && 1054 mode->vdisplay <= m->vdisplay) 1055 ok = true; 1056 } 1057 return ok; 1058 } 1059 1060 static int 1061 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1062 struct detailed_timing *timing) 1063 { 1064 int i, modes = 0; 1065 struct drm_display_mode *newmode; 1066 struct drm_device *dev = connector->dev; 1067 1068 for (i = 0; i < drm_num_dmt_modes; i++) { 1069 if (mode_in_range(drm_dmt_modes + i, edid, timing) && 1070 valid_inferred_mode(connector, drm_dmt_modes + i)) { 1071 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1072 if (newmode) { 1073 drm_mode_probed_add(connector, newmode); 1074 modes++; 1075 } 1076 } 1077 } 1078 1079 return modes; 1080 } 1081 1082 /* fix up 1366x768 mode from 1368x768; 1083 * GFT/CVT can't express 1366 width which isn't dividable by 8 1084 */ 1085 static void fixup_mode_1366x768(struct drm_display_mode *mode) 1086 { 1087 if (mode->hdisplay == 1368 && mode->vdisplay == 768) { 1088 mode->hdisplay = 1366; 1089 mode->hsync_start--; 1090 mode->hsync_end--; 1091 drm_mode_set_name(mode); 1092 } 1093 } 1094 1095 static int 1096 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1097 struct detailed_timing *timing) 1098 { 1099 int i, modes = 0; 1100 struct drm_display_mode *newmode; 1101 struct drm_device *dev = connector->dev; 1102 1103 for (i = 0; i < num_extra_modes; i++) { 1104 const struct minimode *m = &extra_modes[i]; 1105 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0); 1106 if (!newmode) 1107 return modes; 1108 1109 fixup_mode_1366x768(newmode); 1110 if (!mode_in_range(newmode, edid, timing) || 1111 !valid_inferred_mode(connector, newmode)) { 1112 drm_mode_destroy(dev, newmode); 1113 continue; 1114 } 1115 1116 drm_mode_probed_add(connector, newmode); 1117 modes++; 1118 } 1119 1120 return modes; 1121 } 1122 1123 static int 1124 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1125 struct detailed_timing *timing) 1126 { 1127 int i, modes = 0; 1128 struct drm_display_mode *newmode; 1129 struct drm_device *dev = connector->dev; 1130 bool rb = drm_monitor_supports_rb(edid); 1131 1132 for (i = 0; i < num_extra_modes; i++) { 1133 const struct minimode *m = &extra_modes[i]; 1134 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0); 1135 if (!newmode) 1136 return modes; 1137 1138 fixup_mode_1366x768(newmode); 1139 if (!mode_in_range(newmode, edid, timing) || 1140 !valid_inferred_mode(connector, newmode)) { 1141 drm_mode_destroy(dev, newmode); 1142 continue; 1143 } 1144 1145 drm_mode_probed_add(connector, newmode); 1146 modes++; 1147 } 1148 1149 return modes; 1150 } 1151 1152 static void 1153 do_inferred_modes(struct detailed_timing *timing, void *c) 1154 { 1155 struct detailed_mode_closure *closure = c; 1156 struct detailed_non_pixel *data = &timing->data.other_data; 1157 struct detailed_data_monitor_range *range = &data->data.range; 1158 1159 if (data->type != EDID_DETAIL_MONITOR_RANGE) 1160 return; 1161 1162 closure->modes += drm_dmt_modes_for_range(closure->connector, 1163 closure->edid, 1164 timing); 1165 1166 if (!version_greater(closure->edid, 1, 1)) 1167 return; /* GTF not defined yet */ 1168 1169 switch (range->flags) { 1170 case 0x02: /* secondary gtf, XXX could do more */ 1171 case 0x00: /* default gtf */ 1172 closure->modes += drm_gtf_modes_for_range(closure->connector, 1173 closure->edid, 1174 timing); 1175 break; 1176 case 0x04: /* cvt, only in 1.4+ */ 1177 if (!version_greater(closure->edid, 1, 3)) 1178 break; 1179 1180 closure->modes += drm_cvt_modes_for_range(closure->connector, 1181 closure->edid, 1182 timing); 1183 break; 1184 case 0x01: /* just the ranges, no formula */ 1185 default: 1186 break; 1187 } 1188 } 1189 1190 static int 1191 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1192 { 1193 struct detailed_mode_closure closure = { 1194 connector, edid, 0, 0, 0 1195 }; 1196 1197 if (version_greater(edid, 1, 0)) 1198 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1199 &closure); 1200 1201 return closure.modes; 1202 } 1203 1204 static int 1205 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1206 { 1207 int i, j, m, modes = 0; 1208 struct drm_display_mode *mode; 1209 u8 *est = ((u8 *)timing) + 5; 1210 1211 for (i = 0; i < 6; i++) { 1212 for (j = 7; j > 0; j--) { 1213 m = (i * 8) + (7 - j); 1214 if (m >= ARRAY_SIZE(est3_modes)) 1215 break; 1216 if (est[i] & (1 << j)) { 1217 mode = drm_mode_find_dmt(connector->dev, 1218 est3_modes[m].w, 1219 est3_modes[m].h, 1220 est3_modes[m].r, 1221 est3_modes[m].rb); 1222 if (mode) { 1223 drm_mode_probed_add(connector, mode); 1224 modes++; 1225 } 1226 } 1227 } 1228 } 1229 1230 return modes; 1231 } 1232 1233 static void 1234 do_established_modes(struct detailed_timing *timing, void *c) 1235 { 1236 struct detailed_mode_closure *closure = c; 1237 struct detailed_non_pixel *data = &timing->data.other_data; 1238 1239 if (data->type == EDID_DETAIL_EST_TIMINGS) 1240 closure->modes += drm_est3_modes(closure->connector, timing); 1241 } 1242 1243 /** 1244 * add_established_modes - get est. modes from EDID and add them 1245 * @edid: EDID block to scan 1246 * 1247 * Each EDID block contains a bitmap of the supported "established modes" list 1248 * (defined above). Tease them out and add them to the global modes list. 1249 */ 1250 static int 1251 add_established_modes(struct drm_connector *connector, struct edid *edid) 1252 { 1253 struct drm_device *dev = connector->dev; 1254 unsigned long est_bits = edid->established_timings.t1 | 1255 (edid->established_timings.t2 << 8) | 1256 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1257 int i, modes = 0; 1258 struct detailed_mode_closure closure = { 1259 connector, edid, 0, 0, 0 1260 }; 1261 1262 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1263 if (est_bits & (1<<i)) { 1264 struct drm_display_mode *newmode; 1265 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1266 if (newmode) { 1267 drm_mode_probed_add(connector, newmode); 1268 modes++; 1269 } 1270 } 1271 } 1272 1273 if (version_greater(edid, 1, 0)) 1274 drm_for_each_detailed_block((u8 *)edid, 1275 do_established_modes, &closure); 1276 1277 return modes + closure.modes; 1278 } 1279 1280 static void 1281 do_standard_modes(struct detailed_timing *timing, void *c) 1282 { 1283 struct detailed_mode_closure *closure = c; 1284 struct detailed_non_pixel *data = &timing->data.other_data; 1285 struct drm_connector *connector = closure->connector; 1286 struct edid *edid = closure->edid; 1287 1288 if (data->type == EDID_DETAIL_STD_MODES) { 1289 int i; 1290 for (i = 0; i < 6; i++) { 1291 struct std_timing *std; 1292 struct drm_display_mode *newmode; 1293 1294 std = &data->data.timings[i]; 1295 newmode = drm_mode_std(connector, edid, std, 1296 edid->revision); 1297 if (newmode) { 1298 drm_mode_probed_add(connector, newmode); 1299 closure->modes++; 1300 } 1301 } 1302 } 1303 } 1304 1305 /** 1306 * add_standard_modes - get std. modes from EDID and add them 1307 * @edid: EDID block to scan 1308 * 1309 * Standard modes can be calculated using the appropriate standard (DMT, 1310 * GTF or CVT. Grab them from @edid and add them to the list. 1311 */ 1312 static int 1313 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1314 { 1315 int i, modes = 0; 1316 struct detailed_mode_closure closure = { 1317 connector, edid, 0, 0, 0 1318 }; 1319 1320 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1321 struct drm_display_mode *newmode; 1322 1323 newmode = drm_mode_std(connector, edid, 1324 &edid->standard_timings[i], 1325 edid->revision); 1326 if (newmode) { 1327 drm_mode_probed_add(connector, newmode); 1328 modes++; 1329 } 1330 } 1331 1332 if (version_greater(edid, 1, 0)) 1333 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1334 &closure); 1335 1336 /* XXX should also look for standard codes in VTB blocks */ 1337 1338 return modes + closure.modes; 1339 } 1340 1341 static int drm_cvt_modes(struct drm_connector *connector, 1342 struct detailed_timing *timing) 1343 { 1344 int i, j, modes = 0; 1345 struct drm_display_mode *newmode; 1346 struct drm_device *dev = connector->dev; 1347 struct cvt_timing *cvt; 1348 const int rates[] = { 60, 85, 75, 60, 50 }; 1349 const u8 empty[3] = { 0, 0, 0 }; 1350 1351 for (i = 0; i < 4; i++) { 1352 int uninitialized_var(width), height; 1353 cvt = &(timing->data.other_data.data.cvt[i]); 1354 1355 if (!memcmp(cvt->code, empty, 3)) 1356 continue; 1357 1358 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1359 switch (cvt->code[1] & 0x0c) { 1360 case 0x00: 1361 width = height * 4 / 3; 1362 break; 1363 case 0x04: 1364 width = height * 16 / 9; 1365 break; 1366 case 0x08: 1367 width = height * 16 / 10; 1368 break; 1369 case 0x0c: 1370 width = height * 15 / 9; 1371 break; 1372 } 1373 1374 for (j = 1; j < 5; j++) { 1375 if (cvt->code[2] & (1 << j)) { 1376 newmode = drm_cvt_mode(dev, width, height, 1377 rates[j], j == 0, 1378 false, false); 1379 if (newmode) { 1380 drm_mode_probed_add(connector, newmode); 1381 modes++; 1382 } 1383 } 1384 } 1385 } 1386 1387 return modes; 1388 } 1389 1390 static void 1391 do_cvt_mode(struct detailed_timing *timing, void *c) 1392 { 1393 struct detailed_mode_closure *closure = c; 1394 struct detailed_non_pixel *data = &timing->data.other_data; 1395 1396 if (data->type == EDID_DETAIL_CVT_3BYTE) 1397 closure->modes += drm_cvt_modes(closure->connector, timing); 1398 } 1399 1400 static int 1401 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1402 { 1403 struct detailed_mode_closure closure = { 1404 connector, edid, 0, 0, 0 1405 }; 1406 1407 if (version_greater(edid, 1, 2)) 1408 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1409 1410 /* XXX should also look for CVT codes in VTB blocks */ 1411 1412 return closure.modes; 1413 } 1414 1415 static void 1416 do_detailed_mode(struct detailed_timing *timing, void *c) 1417 { 1418 struct detailed_mode_closure *closure = c; 1419 struct drm_display_mode *newmode; 1420 1421 if (timing->pixel_clock) { 1422 newmode = drm_mode_detailed(closure->connector->dev, 1423 closure->edid, timing, 1424 closure->quirks); 1425 if (!newmode) 1426 return; 1427 1428 if (closure->preferred) 1429 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1430 1431 drm_mode_probed_add(closure->connector, newmode); 1432 closure->modes++; 1433 closure->preferred = 0; 1434 } 1435 } 1436 1437 /* 1438 * add_detailed_modes - Add modes from detailed timings 1439 * @connector: attached connector 1440 * @edid: EDID block to scan 1441 * @quirks: quirks to apply 1442 */ 1443 static int 1444 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1445 u32 quirks) 1446 { 1447 struct detailed_mode_closure closure = { 1448 connector, 1449 edid, 1450 1, 1451 quirks, 1452 0 1453 }; 1454 1455 if (closure.preferred && !version_greater(edid, 1, 3)) 1456 closure.preferred = 1457 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1458 1459 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1460 1461 return closure.modes; 1462 } 1463 1464 #define HDMI_IDENTIFIER 0x000C03 1465 #define AUDIO_BLOCK 0x01 1466 #define VIDEO_BLOCK 0x02 1467 #define VENDOR_BLOCK 0x03 1468 #define SPEAKER_BLOCK 0x04 1469 #define EDID_BASIC_AUDIO (1 << 6) 1470 #define EDID_CEA_YCRCB444 (1 << 5) 1471 #define EDID_CEA_YCRCB422 (1 << 4) 1472 1473 /** 1474 * Search EDID for CEA extension block. 1475 */ 1476 u8 *drm_find_cea_extension(struct edid *edid) 1477 { 1478 u8 *edid_ext = NULL; 1479 int i; 1480 1481 /* No EDID or EDID extensions */ 1482 if (edid == NULL || edid->extensions == 0) 1483 return NULL; 1484 1485 /* Find CEA extension */ 1486 for (i = 0; i < edid->extensions; i++) { 1487 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1488 if (edid_ext[0] == CEA_EXT) 1489 break; 1490 } 1491 1492 if (i == edid->extensions) 1493 return NULL; 1494 1495 return edid_ext; 1496 } 1497 EXPORT_SYMBOL(drm_find_cea_extension); 1498 1499 static int 1500 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1501 { 1502 struct drm_device *dev = connector->dev; 1503 u8 * mode, cea_mode; 1504 int modes = 0; 1505 1506 for (mode = db; mode < db + len; mode++) { 1507 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1508 if (cea_mode < drm_num_cea_modes) { 1509 struct drm_display_mode *newmode; 1510 newmode = drm_mode_duplicate(dev, 1511 &edid_cea_modes[cea_mode]); 1512 if (newmode) { 1513 drm_mode_probed_add(connector, newmode); 1514 modes++; 1515 } 1516 } 1517 } 1518 1519 return modes; 1520 } 1521 1522 static int 1523 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1524 { 1525 u8 * cea = drm_find_cea_extension(edid); 1526 u8 * db, dbl; 1527 int modes = 0; 1528 1529 if (cea && cea[1] >= 3) { 1530 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1531 dbl = db[0] & 0x1f; 1532 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK) 1533 modes += do_cea_modes (connector, db+1, dbl); 1534 } 1535 } 1536 1537 return modes; 1538 } 1539 1540 static void 1541 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db) 1542 { 1543 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1544 1545 connector->dvi_dual = db[6] & 1; 1546 connector->max_tmds_clock = db[7] * 5; 1547 1548 connector->latency_present[0] = db[8] >> 7; 1549 connector->latency_present[1] = (db[8] >> 6) & 1; 1550 connector->video_latency[0] = db[9]; 1551 connector->audio_latency[0] = db[10]; 1552 connector->video_latency[1] = db[11]; 1553 connector->audio_latency[1] = db[12]; 1554 1555 DRM_LOG_KMS("HDMI: DVI dual %d, " 1556 "max TMDS clock %d, " 1557 "latency present %d %d, " 1558 "video latency %d %d, " 1559 "audio latency %d %d\n", 1560 connector->dvi_dual, 1561 connector->max_tmds_clock, 1562 (int) connector->latency_present[0], 1563 (int) connector->latency_present[1], 1564 connector->video_latency[0], 1565 connector->video_latency[1], 1566 connector->audio_latency[0], 1567 connector->audio_latency[1]); 1568 } 1569 1570 static void 1571 monitor_name(struct detailed_timing *t, void *data) 1572 { 1573 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1574 *(u8 **)data = t->data.other_data.data.str.str; 1575 } 1576 1577 /** 1578 * drm_edid_to_eld - build ELD from EDID 1579 * @connector: connector corresponding to the HDMI/DP sink 1580 * @edid: EDID to parse 1581 * 1582 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1583 * Some ELD fields are left to the graphics driver caller: 1584 * - Conn_Type 1585 * - HDCP 1586 * - Port_ID 1587 */ 1588 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1589 { 1590 uint8_t *eld = connector->eld; 1591 u8 *cea; 1592 u8 *name; 1593 u8 *db; 1594 int sad_count = 0; 1595 int mnl; 1596 int dbl; 1597 1598 memset(eld, 0, sizeof(connector->eld)); 1599 1600 cea = drm_find_cea_extension(edid); 1601 if (!cea) { 1602 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1603 return; 1604 } 1605 1606 name = NULL; 1607 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1608 for (mnl = 0; name && mnl < 13; mnl++) { 1609 if (name[mnl] == 0x0a) 1610 break; 1611 eld[20 + mnl] = name[mnl]; 1612 } 1613 eld[4] = (cea[1] << 5) | mnl; 1614 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1615 1616 eld[0] = 2 << 3; /* ELD version: 2 */ 1617 1618 eld[16] = edid->mfg_id[0]; 1619 eld[17] = edid->mfg_id[1]; 1620 eld[18] = edid->prod_code[0]; 1621 eld[19] = edid->prod_code[1]; 1622 1623 if (cea[1] >= 3) 1624 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) { 1625 dbl = db[0] & 0x1f; 1626 1627 switch ((db[0] & 0xe0) >> 5) { 1628 case AUDIO_BLOCK: 1629 /* Audio Data Block, contains SADs */ 1630 sad_count = dbl / 3; 1631 memcpy(eld + 20 + mnl, &db[1], dbl); 1632 break; 1633 case SPEAKER_BLOCK: 1634 /* Speaker Allocation Data Block */ 1635 eld[7] = db[1]; 1636 break; 1637 case VENDOR_BLOCK: 1638 /* HDMI Vendor-Specific Data Block */ 1639 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0) 1640 parse_hdmi_vsdb(connector, db); 1641 break; 1642 default: 1643 break; 1644 } 1645 } 1646 eld[5] |= sad_count << 4; 1647 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1648 1649 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1650 } 1651 EXPORT_SYMBOL(drm_edid_to_eld); 1652 1653 /** 1654 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1655 * @connector: connector associated with the HDMI/DP sink 1656 * @mode: the display mode 1657 */ 1658 int drm_av_sync_delay(struct drm_connector *connector, 1659 struct drm_display_mode *mode) 1660 { 1661 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1662 int a, v; 1663 1664 if (!connector->latency_present[0]) 1665 return 0; 1666 if (!connector->latency_present[1]) 1667 i = 0; 1668 1669 a = connector->audio_latency[i]; 1670 v = connector->video_latency[i]; 1671 1672 /* 1673 * HDMI/DP sink doesn't support audio or video? 1674 */ 1675 if (a == 255 || v == 255) 1676 return 0; 1677 1678 /* 1679 * Convert raw EDID values to millisecond. 1680 * Treat unknown latency as 0ms. 1681 */ 1682 if (a) 1683 a = min(2 * (a - 1), 500); 1684 if (v) 1685 v = min(2 * (v - 1), 500); 1686 1687 return max(v - a, 0); 1688 } 1689 EXPORT_SYMBOL(drm_av_sync_delay); 1690 1691 /** 1692 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1693 * @encoder: the encoder just changed display mode 1694 * @mode: the adjusted display mode 1695 * 1696 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1697 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1698 */ 1699 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1700 struct drm_display_mode *mode) 1701 { 1702 struct drm_connector *connector; 1703 struct drm_device *dev = encoder->dev; 1704 1705 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1706 if (connector->encoder == encoder && connector->eld[0]) 1707 return connector; 1708 1709 return NULL; 1710 } 1711 EXPORT_SYMBOL(drm_select_eld); 1712 1713 /** 1714 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1715 * @edid: monitor EDID information 1716 * 1717 * Parse the CEA extension according to CEA-861-B. 1718 * Return true if HDMI, false if not or unknown. 1719 */ 1720 bool drm_detect_hdmi_monitor(struct edid *edid) 1721 { 1722 u8 *edid_ext; 1723 int i, hdmi_id; 1724 int start_offset, end_offset; 1725 bool is_hdmi = false; 1726 1727 edid_ext = drm_find_cea_extension(edid); 1728 if (!edid_ext) 1729 goto end; 1730 1731 /* Data block offset in CEA extension block */ 1732 start_offset = 4; 1733 end_offset = edid_ext[2]; 1734 1735 /* 1736 * Because HDMI identifier is in Vendor Specific Block, 1737 * search it from all data blocks of CEA extension. 1738 */ 1739 for (i = start_offset; i < end_offset; 1740 /* Increased by data block len */ 1741 i += ((edid_ext[i] & 0x1f) + 1)) { 1742 /* Find vendor specific block */ 1743 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 1744 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 1745 edid_ext[i + 3] << 16; 1746 /* Find HDMI identifier */ 1747 if (hdmi_id == HDMI_IDENTIFIER) 1748 is_hdmi = true; 1749 break; 1750 } 1751 } 1752 1753 end: 1754 return is_hdmi; 1755 } 1756 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1757 1758 /** 1759 * drm_detect_monitor_audio - check monitor audio capability 1760 * 1761 * Monitor should have CEA extension block. 1762 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1763 * audio' only. If there is any audio extension block and supported 1764 * audio format, assume at least 'basic audio' support, even if 'basic 1765 * audio' is not defined in EDID. 1766 * 1767 */ 1768 bool drm_detect_monitor_audio(struct edid *edid) 1769 { 1770 u8 *edid_ext; 1771 int i, j; 1772 bool has_audio = false; 1773 int start_offset, end_offset; 1774 1775 edid_ext = drm_find_cea_extension(edid); 1776 if (!edid_ext) 1777 goto end; 1778 1779 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1780 1781 if (has_audio) { 1782 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1783 goto end; 1784 } 1785 1786 /* Data block offset in CEA extension block */ 1787 start_offset = 4; 1788 end_offset = edid_ext[2]; 1789 1790 for (i = start_offset; i < end_offset; 1791 i += ((edid_ext[i] & 0x1f) + 1)) { 1792 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { 1793 has_audio = true; 1794 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) 1795 DRM_DEBUG_KMS("CEA audio format %d\n", 1796 (edid_ext[i + j] >> 3) & 0xf); 1797 goto end; 1798 } 1799 } 1800 end: 1801 return has_audio; 1802 } 1803 EXPORT_SYMBOL(drm_detect_monitor_audio); 1804 1805 /** 1806 * drm_add_display_info - pull display info out if present 1807 * @edid: EDID data 1808 * @info: display info (attached to connector) 1809 * 1810 * Grab any available display info and stuff it into the drm_display_info 1811 * structure that's part of the connector. Useful for tracking bpp and 1812 * color spaces. 1813 */ 1814 static void drm_add_display_info(struct edid *edid, 1815 struct drm_display_info *info) 1816 { 1817 u8 *edid_ext; 1818 1819 info->width_mm = edid->width_cm * 10; 1820 info->height_mm = edid->height_cm * 10; 1821 1822 /* driver figures it out in this case */ 1823 info->bpc = 0; 1824 info->color_formats = 0; 1825 1826 if (edid->revision < 3) 1827 return; 1828 1829 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1830 return; 1831 1832 /* Get data from CEA blocks if present */ 1833 edid_ext = drm_find_cea_extension(edid); 1834 if (edid_ext) { 1835 info->cea_rev = edid_ext[1]; 1836 1837 /* The existence of a CEA block should imply RGB support */ 1838 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1839 if (edid_ext[3] & EDID_CEA_YCRCB444) 1840 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1841 if (edid_ext[3] & EDID_CEA_YCRCB422) 1842 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1843 } 1844 1845 /* Only defined for 1.4 with digital displays */ 1846 if (edid->revision < 4) 1847 return; 1848 1849 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1850 case DRM_EDID_DIGITAL_DEPTH_6: 1851 info->bpc = 6; 1852 break; 1853 case DRM_EDID_DIGITAL_DEPTH_8: 1854 info->bpc = 8; 1855 break; 1856 case DRM_EDID_DIGITAL_DEPTH_10: 1857 info->bpc = 10; 1858 break; 1859 case DRM_EDID_DIGITAL_DEPTH_12: 1860 info->bpc = 12; 1861 break; 1862 case DRM_EDID_DIGITAL_DEPTH_14: 1863 info->bpc = 14; 1864 break; 1865 case DRM_EDID_DIGITAL_DEPTH_16: 1866 info->bpc = 16; 1867 break; 1868 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1869 default: 1870 info->bpc = 0; 1871 break; 1872 } 1873 1874 info->color_formats |= DRM_COLOR_FORMAT_RGB444; 1875 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444) 1876 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1877 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) 1878 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1879 } 1880 1881 /** 1882 * drm_add_edid_modes - add modes from EDID data, if available 1883 * @connector: connector we're probing 1884 * @edid: edid data 1885 * 1886 * Add the specified modes to the connector's mode list. 1887 * 1888 * Return number of modes added or 0 if we couldn't find any. 1889 */ 1890 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1891 { 1892 int num_modes = 0; 1893 u32 quirks; 1894 1895 if (edid == NULL) { 1896 return 0; 1897 } 1898 if (!drm_edid_is_valid(edid)) { 1899 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 1900 drm_get_connector_name(connector)); 1901 return 0; 1902 } 1903 1904 quirks = edid_get_quirks(edid); 1905 1906 /* 1907 * EDID spec says modes should be preferred in this order: 1908 * - preferred detailed mode 1909 * - other detailed modes from base block 1910 * - detailed modes from extension blocks 1911 * - CVT 3-byte code modes 1912 * - standard timing codes 1913 * - established timing codes 1914 * - modes inferred from GTF or CVT range information 1915 * 1916 * We get this pretty much right. 1917 * 1918 * XXX order for additional mode types in extension blocks? 1919 */ 1920 num_modes += add_detailed_modes(connector, edid, quirks); 1921 num_modes += add_cvt_modes(connector, edid); 1922 num_modes += add_standard_modes(connector, edid); 1923 num_modes += add_established_modes(connector, edid); 1924 num_modes += add_inferred_modes(connector, edid); 1925 num_modes += add_cea_modes(connector, edid); 1926 1927 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 1928 edid_fixup_preferred(connector, quirks); 1929 1930 drm_add_display_info(edid, &connector->display_info); 1931 1932 return num_modes; 1933 } 1934 EXPORT_SYMBOL(drm_add_edid_modes); 1935 1936 /** 1937 * drm_add_modes_noedid - add modes for the connectors without EDID 1938 * @connector: connector we're probing 1939 * @hdisplay: the horizontal display limit 1940 * @vdisplay: the vertical display limit 1941 * 1942 * Add the specified modes to the connector's mode list. Only when the 1943 * hdisplay/vdisplay is not beyond the given limit, it will be added. 1944 * 1945 * Return number of modes added or 0 if we couldn't find any. 1946 */ 1947 int drm_add_modes_noedid(struct drm_connector *connector, 1948 int hdisplay, int vdisplay) 1949 { 1950 int i, count, num_modes = 0; 1951 struct drm_display_mode *mode; 1952 struct drm_device *dev = connector->dev; 1953 1954 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 1955 if (hdisplay < 0) 1956 hdisplay = 0; 1957 if (vdisplay < 0) 1958 vdisplay = 0; 1959 1960 for (i = 0; i < count; i++) { 1961 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 1962 if (hdisplay && vdisplay) { 1963 /* 1964 * Only when two are valid, they will be used to check 1965 * whether the mode should be added to the mode list of 1966 * the connector. 1967 */ 1968 if (ptr->hdisplay > hdisplay || 1969 ptr->vdisplay > vdisplay) 1970 continue; 1971 } 1972 if (drm_mode_vrefresh(ptr) > 61) 1973 continue; 1974 mode = drm_mode_duplicate(dev, ptr); 1975 if (mode) { 1976 drm_mode_probed_add(connector, mode); 1977 num_modes++; 1978 } 1979 } 1980 return num_modes; 1981 } 1982 EXPORT_SYMBOL(drm_add_modes_noedid); 1983