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 * $FreeBSD: head/sys/dev/drm2/drm_edid.c 249041 2013-04-03 08:27:35Z dumbbell $ 31 */ 32 33 #include <linux/export.h> 34 #include <linux/kernel.h> 35 #include <linux/i2c.h> 36 #include <drm/drmP.h> 37 #include <drm/drm_edid.h> 38 #include "drm_edid_modes.h" 39 #include <bus/iicbus/iic.h> 40 #include <bus/iicbus/iiconf.h> 41 #include "iicbus_if.h" 42 43 #define version_greater(edid, maj, min) \ 44 (((edid)->version > (maj)) || \ 45 ((edid)->version == (maj) && (edid)->revision > (min))) 46 47 #define EDID_EST_TIMINGS 16 48 #define EDID_STD_TIMINGS 8 49 #define EDID_DETAILED_TIMINGS 4 50 51 /* 52 * EDID blocks out in the wild have a variety of bugs, try to collect 53 * them here (note that userspace may work around broken monitors first, 54 * but fixes should make their way here so that the kernel "just works" 55 * on as many displays as possible). 56 */ 57 58 /* First detailed mode wrong, use largest 60Hz mode */ 59 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 60 /* Reported 135MHz pixel clock is too high, needs adjustment */ 61 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 62 /* Prefer the largest mode at 75 Hz */ 63 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 64 /* Detail timing is in cm not mm */ 65 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 66 /* Detailed timing descriptors have bogus size values, so just take the 67 * maximum size and use that. 68 */ 69 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 70 /* Monitor forgot to set the first detailed is preferred bit. */ 71 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 72 /* use +hsync +vsync for detailed mode */ 73 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 74 /* Force reduced-blanking timings for detailed modes */ 75 #define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7) 76 77 struct detailed_mode_closure { 78 struct drm_connector *connector; 79 struct edid *edid; 80 bool preferred; 81 u32 quirks; 82 int modes; 83 }; 84 85 #define LEVEL_DMT 0 86 #define LEVEL_GTF 1 87 #define LEVEL_GTF2 2 88 #define LEVEL_CVT 3 89 90 static struct edid_quirk { 91 char vendor[4]; 92 int product_id; 93 u32 quirks; 94 } edid_quirk_list[] = { 95 /* ASUS VW222S */ 96 { "ACI", 0x22a2, EDID_QUIRK_FORCE_REDUCED_BLANKING }, 97 98 /* Acer AL1706 */ 99 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 100 /* Acer F51 */ 101 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 102 /* Unknown Acer */ 103 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 104 105 /* Belinea 10 15 55 */ 106 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 107 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 108 109 /* Envision Peripherals, Inc. EN-7100e */ 110 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 111 /* Envision EN2028 */ 112 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 113 114 /* Funai Electronics PM36B */ 115 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 116 EDID_QUIRK_DETAILED_IN_CM }, 117 118 /* LG Philips LCD LP154W01-A5 */ 119 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 120 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 121 122 /* Philips 107p5 CRT */ 123 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 124 125 /* Proview AY765C */ 126 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 127 128 /* Samsung SyncMaster 205BW. Note: irony */ 129 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 130 /* Samsung SyncMaster 22[5-6]BW */ 131 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 132 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 133 134 /* ViewSonic VA2026w */ 135 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING }, 136 }; 137 138 /*** DDC fetch and block validation ***/ 139 140 static const u8 edid_header[] = { 141 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 142 }; 143 144 /* 145 * Sanity check the header of the base EDID block. Return 8 if the header 146 * is perfect, down to 0 if it's totally wrong. 147 */ 148 int drm_edid_header_is_valid(const u8 *raw_edid) 149 { 150 int i, score = 0; 151 152 for (i = 0; i < sizeof(edid_header); i++) 153 if (raw_edid[i] == edid_header[i]) 154 score++; 155 156 return score; 157 } 158 EXPORT_SYMBOL(drm_edid_header_is_valid); 159 160 static int edid_fixup __read_mostly = 6; 161 162 /* 163 * Sanity check the EDID block (base or extension). Return 0 if the block 164 * doesn't check out, or 1 if it's valid. 165 */ 166 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid) 167 { 168 int i; 169 u8 csum = 0; 170 struct edid *edid = (struct edid *)raw_edid; 171 172 if (edid_fixup > 8 || edid_fixup < 0) 173 edid_fixup = 6; 174 175 if (block == 0) { 176 int score = drm_edid_header_is_valid(raw_edid); 177 if (score == 8) ; 178 else if (score >= edid_fixup) { 179 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 180 memcpy(raw_edid, edid_header, sizeof(edid_header)); 181 } else { 182 goto bad; 183 } 184 } 185 186 for (i = 0; i < EDID_LENGTH; i++) 187 csum += raw_edid[i]; 188 if (csum) { 189 if (print_bad_edid) { 190 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 191 } 192 193 /* allow CEA to slide through, switches mangle this */ 194 if (raw_edid[0] != 0x02) 195 goto bad; 196 } 197 198 /* per-block-type checks */ 199 switch (raw_edid[0]) { 200 case 0: /* base */ 201 if (edid->version != 1) { 202 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 203 goto bad; 204 } 205 206 if (edid->revision > 4) 207 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 208 break; 209 210 default: 211 break; 212 } 213 214 return 1; 215 216 bad: 217 if (raw_edid && print_bad_edid) { 218 DRM_DEBUG_KMS("Raw EDID:\n"); 219 if ((drm_debug & DRM_DEBUGBITS_KMS) != 0) { 220 for (i = 0; i < EDID_LENGTH; ) { 221 kprintf("%02x", raw_edid[i]); 222 i++; 223 if (i % 16 == 0 || i == EDID_LENGTH) 224 kprintf("\n"); 225 else if (i % 8 == 0) 226 kprintf(" "); 227 else 228 kprintf(" "); 229 } 230 } 231 } 232 return 0; 233 } 234 EXPORT_SYMBOL(drm_edid_block_valid); 235 236 /** 237 * drm_edid_is_valid - sanity check EDID data 238 * @edid: EDID data 239 * 240 * Sanity-check an entire EDID record (including extensions) 241 */ 242 bool drm_edid_is_valid(struct edid *edid) 243 { 244 int i; 245 u8 *raw = (u8 *)edid; 246 247 if (!edid) 248 return false; 249 250 for (i = 0; i <= edid->extensions; i++) 251 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true)) 252 return false; 253 254 return true; 255 } 256 EXPORT_SYMBOL(drm_edid_is_valid); 257 258 #define DDC_SEGMENT_ADDR 0x30 259 /** 260 * Get EDID information via I2C. 261 * 262 * \param adapter : i2c device adaptor 263 * \param buf : EDID data buffer to be filled 264 * \param len : EDID data buffer length 265 * \return 0 on success or -1 on failure. 266 * 267 * Try to fetch EDID information by calling i2c driver function. 268 */ 269 static int 270 drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf, 271 int block, int len) 272 { 273 unsigned char start = block * EDID_LENGTH; 274 unsigned char segment = block >> 1; 275 unsigned char xfers = segment ? 3 : 2; 276 int ret, retries = 5; 277 278 /* The core i2c driver will automatically retry the transfer if the 279 * adapter reports EAGAIN. However, we find that bit-banging transfers 280 * are susceptible to errors under a heavily loaded machine and 281 * generate spurious NAKs and timeouts. Retrying the transfer 282 * of the individual block a few times seems to overcome this. 283 */ 284 do { 285 struct i2c_msg msgs[] = { 286 { 287 .slave = DDC_SEGMENT_ADDR << 1, 288 .flags = 0, 289 .len = 1, 290 .buf = &segment, 291 }, { 292 .slave = DDC_ADDR << 1, 293 .flags = 0, 294 .len = 1, 295 .buf = &start, 296 }, { 297 .slave = DDC_ADDR << 1, 298 .flags = I2C_M_RD, 299 .len = len, 300 .buf = buf, 301 } 302 }; 303 304 /* 305 * Avoid sending the segment addr to not upset non-compliant ddc 306 * monitors. 307 */ 308 ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers); 309 310 if (ret != 0) 311 DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n", 312 retries, ret); 313 } while (ret != 0 && --retries); 314 315 return (ret == 0 ? 0 : -1); 316 } 317 318 static bool drm_edid_is_zero(u8 *in_edid, int length) 319 { 320 int i; 321 u32 *raw_edid = (u32 *)in_edid; 322 323 for (i = 0; i < length / 4; i++) 324 if (*(raw_edid + i) != 0) 325 return false; 326 return true; 327 } 328 329 static u8 * 330 drm_do_get_edid(struct drm_connector *connector, device_t adapter) 331 { 332 int i, j = 0, valid_extensions = 0; 333 u8 *block, *new; 334 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS); 335 336 block = kmalloc(EDID_LENGTH, M_DRM, M_WAITOK | M_ZERO); 337 338 /* base block fetch */ 339 for (i = 0; i < 4; i++) { 340 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 341 goto out; 342 if (drm_edid_block_valid(block, 0, print_bad_edid)) 343 break; 344 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 345 connector->null_edid_counter++; 346 goto carp; 347 } 348 } 349 if (i == 4) 350 goto carp; 351 352 /* if there's no extensions, we're done */ 353 if (block[0x7e] == 0) 354 return block; 355 356 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, M_DRM, 357 M_WAITOK); 358 if (!new) 359 goto out; 360 block = new; 361 362 for (j = 1; j <= block[0x7e]; j++) { 363 for (i = 0; i < 4; i++) { 364 if (drm_do_probe_ddc_edid(adapter, 365 block + (valid_extensions + 1) * EDID_LENGTH, 366 j, EDID_LENGTH)) 367 goto out; 368 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) { 369 valid_extensions++; 370 break; 371 } 372 } 373 if (i == 4) 374 dev_warn(connector->dev->dev, 375 "%s: Ignoring invalid EDID block %d.\n", 376 drm_get_connector_name(connector), j); 377 } 378 379 if (valid_extensions != block[0x7e]) { 380 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 381 block[0x7e] = valid_extensions; 382 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, 383 M_DRM, M_WAITOK); 384 if (!new) 385 goto out; 386 block = new; 387 } 388 389 return block; 390 391 carp: 392 if (print_bad_edid) { 393 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 394 drm_get_connector_name(connector), j); 395 } 396 connector->bad_edid_counter++; 397 398 out: 399 kfree(block, M_DRM); 400 return NULL; 401 } 402 403 /** 404 * Probe DDC presence. 405 * 406 * \param adapter : i2c device adaptor 407 * \return 1 on success 408 */ 409 bool 410 drm_probe_ddc(device_t adapter) 411 { 412 unsigned char out; 413 414 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 415 } 416 EXPORT_SYMBOL(drm_probe_ddc); 417 418 /** 419 * drm_get_edid - get EDID data, if available 420 * @connector: connector we're probing 421 * @adapter: i2c adapter to use for DDC 422 * 423 * Poke the given i2c channel to grab EDID data if possible. If found, 424 * attach it to the connector. 425 * 426 * Return edid data or NULL if we couldn't find any. 427 */ 428 struct edid *drm_get_edid(struct drm_connector *connector, 429 device_t adapter) 430 { 431 struct edid *edid = NULL; 432 433 if (drm_probe_ddc(adapter)) 434 edid = (struct edid *)drm_do_get_edid(connector, adapter); 435 436 return edid; 437 } 438 EXPORT_SYMBOL(drm_get_edid); 439 440 /*** EDID parsing ***/ 441 442 /** 443 * edid_vendor - match a string against EDID's obfuscated vendor field 444 * @edid: EDID to match 445 * @vendor: vendor string 446 * 447 * Returns true if @vendor is in @edid, false otherwise 448 */ 449 static bool edid_vendor(struct edid *edid, char *vendor) 450 { 451 char edid_vendor[3]; 452 453 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 454 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 455 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 456 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 457 458 return !strncmp(edid_vendor, vendor, 3); 459 } 460 461 /** 462 * edid_get_quirks - return quirk flags for a given EDID 463 * @edid: EDID to process 464 * 465 * This tells subsequent routines what fixes they need to apply. 466 */ 467 static u32 edid_get_quirks(struct edid *edid) 468 { 469 struct edid_quirk *quirk; 470 int i; 471 472 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 473 quirk = &edid_quirk_list[i]; 474 475 if (edid_vendor(edid, quirk->vendor) && 476 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 477 return quirk->quirks; 478 } 479 480 return 0; 481 } 482 483 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 484 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 485 486 /** 487 * edid_fixup_preferred - set preferred modes based on quirk list 488 * @connector: has mode list to fix up 489 * @quirks: quirks list 490 * 491 * Walk the mode list for @connector, clearing the preferred status 492 * on existing modes and setting it anew for the right mode ala @quirks. 493 */ 494 static void edid_fixup_preferred(struct drm_connector *connector, 495 u32 quirks) 496 { 497 struct drm_display_mode *t, *cur_mode, *preferred_mode; 498 int target_refresh = 0; 499 500 if (list_empty(&connector->probed_modes)) 501 return; 502 503 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 504 target_refresh = 60; 505 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 506 target_refresh = 75; 507 508 preferred_mode = list_first_entry(&connector->probed_modes, 509 struct drm_display_mode, head); 510 511 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 512 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 513 514 if (cur_mode == preferred_mode) 515 continue; 516 517 /* Largest mode is preferred */ 518 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 519 preferred_mode = cur_mode; 520 521 /* At a given size, try to get closest to target refresh */ 522 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 523 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 524 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 525 preferred_mode = cur_mode; 526 } 527 } 528 529 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 530 } 531 532 static bool 533 mode_is_rb(const struct drm_display_mode *mode) 534 { 535 return (mode->htotal - mode->hdisplay == 160) && 536 (mode->hsync_end - mode->hdisplay == 80) && 537 (mode->hsync_end - mode->hsync_start == 32) && 538 (mode->vsync_start - mode->vdisplay == 3); 539 } 540 541 /* 542 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 543 * @dev: Device to duplicate against 544 * @hsize: Mode width 545 * @vsize: Mode height 546 * @fresh: Mode refresh rate 547 * @rb: Mode reduced-blanking-ness 548 * 549 * Walk the DMT mode list looking for a match for the given parameters. 550 * Return a newly allocated copy of the mode, or NULL if not found. 551 */ 552 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 553 int hsize, int vsize, int fresh, 554 bool rb) 555 { 556 int i; 557 558 for (i = 0; i < drm_num_dmt_modes; i++) { 559 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 560 if (hsize != ptr->hdisplay) 561 continue; 562 if (vsize != ptr->vdisplay) 563 continue; 564 if (fresh != drm_mode_vrefresh(ptr)) 565 continue; 566 if (rb != mode_is_rb(ptr)) 567 continue; 568 569 return drm_mode_duplicate(dev, ptr); 570 } 571 572 return NULL; 573 } 574 EXPORT_SYMBOL(drm_mode_find_dmt); 575 576 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 577 578 static void 579 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 580 { 581 int i, n = 0; 582 u8 d = ext[0x02]; 583 u8 *det_base = ext + d; 584 585 n = (127 - d) / 18; 586 for (i = 0; i < n; i++) 587 cb((struct detailed_timing *)(det_base + 18 * i), closure); 588 } 589 590 static void 591 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 592 { 593 unsigned int i, n = min((int)ext[0x02], 6); 594 u8 *det_base = ext + 5; 595 596 if (ext[0x01] != 1) 597 return; /* unknown version */ 598 599 for (i = 0; i < n; i++) 600 cb((struct detailed_timing *)(det_base + 18 * i), closure); 601 } 602 603 static void 604 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 605 { 606 int i; 607 struct edid *edid = (struct edid *)raw_edid; 608 609 if (edid == NULL) 610 return; 611 612 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 613 cb(&(edid->detailed_timings[i]), closure); 614 615 for (i = 1; i <= raw_edid[0x7e]; i++) { 616 u8 *ext = raw_edid + (i * EDID_LENGTH); 617 switch (*ext) { 618 case CEA_EXT: 619 cea_for_each_detailed_block(ext, cb, closure); 620 break; 621 case VTB_EXT: 622 vtb_for_each_detailed_block(ext, cb, closure); 623 break; 624 default: 625 break; 626 } 627 } 628 } 629 630 static void 631 is_rb(struct detailed_timing *t, void *data) 632 { 633 u8 *r = (u8 *)t; 634 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 635 if (r[15] & 0x10) 636 *(bool *)data = true; 637 } 638 639 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 640 static bool 641 drm_monitor_supports_rb(struct edid *edid) 642 { 643 if (edid->revision >= 4) { 644 bool ret = false; 645 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 646 return ret; 647 } 648 649 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 650 } 651 652 static void 653 find_gtf2(struct detailed_timing *t, void *data) 654 { 655 u8 *r = (u8 *)t; 656 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 657 *(u8 **)data = r; 658 } 659 660 /* Secondary GTF curve kicks in above some break frequency */ 661 static int 662 drm_gtf2_hbreak(struct edid *edid) 663 { 664 u8 *r = NULL; 665 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 666 return r ? (r[12] * 2) : 0; 667 } 668 669 static int 670 drm_gtf2_2c(struct edid *edid) 671 { 672 u8 *r = NULL; 673 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 674 return r ? r[13] : 0; 675 } 676 677 static int 678 drm_gtf2_m(struct edid *edid) 679 { 680 u8 *r = NULL; 681 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 682 return r ? (r[15] << 8) + r[14] : 0; 683 } 684 685 static int 686 drm_gtf2_k(struct edid *edid) 687 { 688 u8 *r = NULL; 689 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 690 return r ? r[16] : 0; 691 } 692 693 static int 694 drm_gtf2_2j(struct edid *edid) 695 { 696 u8 *r = NULL; 697 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 698 return r ? r[17] : 0; 699 } 700 701 /** 702 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 703 * @edid: EDID block to scan 704 */ 705 static int standard_timing_level(struct edid *edid) 706 { 707 if (edid->revision >= 2) { 708 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 709 return LEVEL_CVT; 710 if (drm_gtf2_hbreak(edid)) 711 return LEVEL_GTF2; 712 return LEVEL_GTF; 713 } 714 return LEVEL_DMT; 715 } 716 717 /* 718 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 719 * monitors fill with ascii space (0x20) instead. 720 */ 721 static int 722 bad_std_timing(u8 a, u8 b) 723 { 724 return (a == 0x00 && b == 0x00) || 725 (a == 0x01 && b == 0x01) || 726 (a == 0x20 && b == 0x20); 727 } 728 729 /** 730 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 731 * @t: standard timing params 732 * @timing_level: standard timing level 733 * 734 * Take the standard timing params (in this case width, aspect, and refresh) 735 * and convert them into a real mode using CVT/GTF/DMT. 736 */ 737 static struct drm_display_mode * 738 drm_mode_std(struct drm_connector *connector, struct edid *edid, 739 struct std_timing *t, int revision) 740 { 741 struct drm_device *dev = connector->dev; 742 struct drm_display_mode *m, *mode = NULL; 743 int hsize, vsize; 744 int vrefresh_rate; 745 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 746 >> EDID_TIMING_ASPECT_SHIFT; 747 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 748 >> EDID_TIMING_VFREQ_SHIFT; 749 int timing_level = standard_timing_level(edid); 750 751 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 752 return NULL; 753 754 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 755 hsize = t->hsize * 8 + 248; 756 /* vrefresh_rate = vfreq + 60 */ 757 vrefresh_rate = vfreq + 60; 758 /* the vdisplay is calculated based on the aspect ratio */ 759 if (aspect_ratio == 0) { 760 if (revision < 3) 761 vsize = hsize; 762 else 763 vsize = (hsize * 10) / 16; 764 } else if (aspect_ratio == 1) 765 vsize = (hsize * 3) / 4; 766 else if (aspect_ratio == 2) 767 vsize = (hsize * 4) / 5; 768 else 769 vsize = (hsize * 9) / 16; 770 771 /* HDTV hack, part 1 */ 772 if (vrefresh_rate == 60 && 773 ((hsize == 1360 && vsize == 765) || 774 (hsize == 1368 && vsize == 769))) { 775 hsize = 1366; 776 vsize = 768; 777 } 778 779 /* 780 * If this connector already has a mode for this size and refresh 781 * rate (because it came from detailed or CVT info), use that 782 * instead. This way we don't have to guess at interlace or 783 * reduced blanking. 784 */ 785 list_for_each_entry(m, &connector->probed_modes, head) 786 if (m->hdisplay == hsize && m->vdisplay == vsize && 787 drm_mode_vrefresh(m) == vrefresh_rate) 788 return NULL; 789 790 /* HDTV hack, part 2 */ 791 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 792 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 793 false); 794 mode->hdisplay = 1366; 795 mode->hsync_start = mode->hsync_start - 1; 796 mode->hsync_end = mode->hsync_end - 1; 797 return mode; 798 } 799 800 /* check whether it can be found in default mode table */ 801 if (drm_monitor_supports_rb(edid)) { 802 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, 803 true); 804 if (mode) 805 return mode; 806 } 807 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false); 808 if (mode) 809 return mode; 810 811 /* okay, generate it */ 812 switch (timing_level) { 813 case LEVEL_DMT: 814 break; 815 case LEVEL_GTF: 816 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 817 break; 818 case LEVEL_GTF2: 819 /* 820 * This is potentially wrong if there's ever a monitor with 821 * more than one ranges section, each claiming a different 822 * secondary GTF curve. Please don't do that. 823 */ 824 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 825 if (!mode) 826 return NULL; 827 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 828 drm_mode_destroy(dev, mode); 829 mode = drm_gtf_mode_complex(dev, hsize, vsize, 830 vrefresh_rate, 0, 0, 831 drm_gtf2_m(edid), 832 drm_gtf2_2c(edid), 833 drm_gtf2_k(edid), 834 drm_gtf2_2j(edid)); 835 } 836 break; 837 case LEVEL_CVT: 838 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 839 false); 840 break; 841 } 842 return mode; 843 } 844 845 /* 846 * EDID is delightfully ambiguous about how interlaced modes are to be 847 * encoded. Our internal representation is of frame height, but some 848 * HDTV detailed timings are encoded as field height. 849 * 850 * The format list here is from CEA, in frame size. Technically we 851 * should be checking refresh rate too. Whatever. 852 */ 853 static void 854 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 855 struct detailed_pixel_timing *pt) 856 { 857 int i; 858 static const struct { 859 int w, h; 860 } cea_interlaced[] = { 861 { 1920, 1080 }, 862 { 720, 480 }, 863 { 1440, 480 }, 864 { 2880, 480 }, 865 { 720, 576 }, 866 { 1440, 576 }, 867 { 2880, 576 }, 868 }; 869 870 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 871 return; 872 873 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 874 if ((mode->hdisplay == cea_interlaced[i].w) && 875 (mode->vdisplay == cea_interlaced[i].h / 2)) { 876 mode->vdisplay *= 2; 877 mode->vsync_start *= 2; 878 mode->vsync_end *= 2; 879 mode->vtotal *= 2; 880 mode->vtotal |= 1; 881 } 882 } 883 884 mode->flags |= DRM_MODE_FLAG_INTERLACE; 885 } 886 887 /** 888 * drm_mode_detailed - create a new mode from an EDID detailed timing section 889 * @dev: DRM device (needed to create new mode) 890 * @edid: EDID block 891 * @timing: EDID detailed timing info 892 * @quirks: quirks to apply 893 * 894 * An EDID detailed timing block contains enough info for us to create and 895 * return a new struct drm_display_mode. 896 */ 897 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 898 struct edid *edid, 899 struct detailed_timing *timing, 900 u32 quirks) 901 { 902 struct drm_display_mode *mode; 903 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 904 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 905 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 906 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 907 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 908 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 909 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 910 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 911 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 912 913 /* ignore tiny modes */ 914 if (hactive < 64 || vactive < 64) 915 return NULL; 916 917 if (pt->misc & DRM_EDID_PT_STEREO) { 918 kprintf("stereo mode not supported\n"); 919 return NULL; 920 } 921 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 922 kprintf("composite sync not supported\n"); 923 } 924 925 /* it is incorrect if hsync/vsync width is zero */ 926 if (!hsync_pulse_width || !vsync_pulse_width) { 927 DRM_DEBUG_KMS("Incorrect Detailed timing. " 928 "Wrong Hsync/Vsync pulse width\n"); 929 return NULL; 930 } 931 932 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) { 933 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false); 934 if (!mode) 935 return NULL; 936 937 goto set_size; 938 } 939 940 mode = drm_mode_create(dev); 941 if (!mode) 942 return NULL; 943 944 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 945 timing->pixel_clock = cpu_to_le16(1088); 946 947 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 948 949 mode->hdisplay = hactive; 950 mode->hsync_start = mode->hdisplay + hsync_offset; 951 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 952 mode->htotal = mode->hdisplay + hblank; 953 954 mode->vdisplay = vactive; 955 mode->vsync_start = mode->vdisplay + vsync_offset; 956 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 957 mode->vtotal = mode->vdisplay + vblank; 958 959 /* Some EDIDs have bogus h/vtotal values */ 960 if (mode->hsync_end > mode->htotal) 961 mode->htotal = mode->hsync_end + 1; 962 if (mode->vsync_end > mode->vtotal) 963 mode->vtotal = mode->vsync_end + 1; 964 965 drm_mode_do_interlace_quirk(mode, pt); 966 967 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 968 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 969 } 970 971 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 972 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 973 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 974 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 975 976 set_size: 977 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 978 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 979 980 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 981 mode->width_mm *= 10; 982 mode->height_mm *= 10; 983 } 984 985 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 986 mode->width_mm = edid->width_cm * 10; 987 mode->height_mm = edid->height_cm * 10; 988 } 989 990 mode->type = DRM_MODE_TYPE_DRIVER; 991 drm_mode_set_name(mode); 992 993 return mode; 994 } 995 996 static bool 997 mode_in_hsync_range(const struct drm_display_mode *mode, 998 struct edid *edid, u8 *t) 999 { 1000 int hsync, hmin, hmax; 1001 1002 hmin = t[7]; 1003 if (edid->revision >= 4) 1004 hmin += ((t[4] & 0x04) ? 255 : 0); 1005 hmax = t[8]; 1006 if (edid->revision >= 4) 1007 hmax += ((t[4] & 0x08) ? 255 : 0); 1008 hsync = drm_mode_hsync(mode); 1009 1010 return (hsync <= hmax && hsync >= hmin); 1011 } 1012 1013 static bool 1014 mode_in_vsync_range(const struct drm_display_mode *mode, 1015 struct edid *edid, u8 *t) 1016 { 1017 int vsync, vmin, vmax; 1018 1019 vmin = t[5]; 1020 if (edid->revision >= 4) 1021 vmin += ((t[4] & 0x01) ? 255 : 0); 1022 vmax = t[6]; 1023 if (edid->revision >= 4) 1024 vmax += ((t[4] & 0x02) ? 255 : 0); 1025 vsync = drm_mode_vrefresh(mode); 1026 1027 return (vsync <= vmax && vsync >= vmin); 1028 } 1029 1030 static u32 1031 range_pixel_clock(struct edid *edid, u8 *t) 1032 { 1033 /* unspecified */ 1034 if (t[9] == 0 || t[9] == 255) 1035 return 0; 1036 1037 /* 1.4 with CVT support gives us real precision, yay */ 1038 if (edid->revision >= 4 && t[10] == 0x04) 1039 return (t[9] * 10000) - ((t[12] >> 2) * 250); 1040 1041 /* 1.3 is pathetic, so fuzz up a bit */ 1042 return t[9] * 10000 + 5001; 1043 } 1044 1045 static bool 1046 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 1047 struct detailed_timing *timing) 1048 { 1049 u32 max_clock; 1050 u8 *t = (u8 *)timing; 1051 1052 if (!mode_in_hsync_range(mode, edid, t)) 1053 return false; 1054 1055 if (!mode_in_vsync_range(mode, edid, t)) 1056 return false; 1057 1058 if ((max_clock = range_pixel_clock(edid, t))) 1059 if (mode->clock > max_clock) 1060 return false; 1061 1062 /* 1.4 max horizontal check */ 1063 if (edid->revision >= 4 && t[10] == 0x04) 1064 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1065 return false; 1066 1067 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1068 return false; 1069 1070 return true; 1071 } 1072 1073 static bool valid_inferred_mode(const struct drm_connector *connector, 1074 const struct drm_display_mode *mode) 1075 { 1076 struct drm_display_mode *m; 1077 bool ok = false; 1078 1079 list_for_each_entry(m, &connector->probed_modes, head) { 1080 if (mode->hdisplay == m->hdisplay && 1081 mode->vdisplay == m->vdisplay && 1082 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m)) 1083 return false; /* duplicated */ 1084 if (mode->hdisplay <= m->hdisplay && 1085 mode->vdisplay <= m->vdisplay) 1086 ok = true; 1087 } 1088 return ok; 1089 } 1090 1091 static int 1092 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1093 struct detailed_timing *timing) 1094 { 1095 int i, modes = 0; 1096 struct drm_display_mode *newmode; 1097 struct drm_device *dev = connector->dev; 1098 1099 for (i = 0; i < drm_num_dmt_modes; i++) { 1100 if (mode_in_range(drm_dmt_modes + i, edid, timing) && 1101 valid_inferred_mode(connector, drm_dmt_modes + i)) { 1102 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1103 if (newmode) { 1104 drm_mode_probed_add(connector, newmode); 1105 modes++; 1106 } 1107 } 1108 } 1109 1110 return modes; 1111 } 1112 1113 /* fix up 1366x768 mode from 1368x768; 1114 * GFT/CVT can't express 1366 width which isn't dividable by 8 1115 */ 1116 static void fixup_mode_1366x768(struct drm_display_mode *mode) 1117 { 1118 if (mode->hdisplay == 1368 && mode->vdisplay == 768) { 1119 mode->hdisplay = 1366; 1120 mode->hsync_start--; 1121 mode->hsync_end--; 1122 drm_mode_set_name(mode); 1123 } 1124 } 1125 1126 static int 1127 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1128 struct detailed_timing *timing) 1129 { 1130 int i, modes = 0; 1131 struct drm_display_mode *newmode; 1132 struct drm_device *dev = connector->dev; 1133 1134 for (i = 0; i < num_extra_modes; i++) { 1135 const struct minimode *m = &extra_modes[i]; 1136 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0); 1137 if (!newmode) 1138 return modes; 1139 1140 fixup_mode_1366x768(newmode); 1141 if (!mode_in_range(newmode, edid, timing) || 1142 !valid_inferred_mode(connector, newmode)) { 1143 drm_mode_destroy(dev, newmode); 1144 continue; 1145 } 1146 1147 drm_mode_probed_add(connector, newmode); 1148 modes++; 1149 } 1150 1151 return modes; 1152 } 1153 1154 static int 1155 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1156 struct detailed_timing *timing) 1157 { 1158 int i, modes = 0; 1159 struct drm_display_mode *newmode; 1160 struct drm_device *dev = connector->dev; 1161 bool rb = drm_monitor_supports_rb(edid); 1162 1163 for (i = 0; i < num_extra_modes; i++) { 1164 const struct minimode *m = &extra_modes[i]; 1165 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0); 1166 if (!newmode) 1167 return modes; 1168 1169 fixup_mode_1366x768(newmode); 1170 if (!mode_in_range(newmode, edid, timing) || 1171 !valid_inferred_mode(connector, newmode)) { 1172 drm_mode_destroy(dev, newmode); 1173 continue; 1174 } 1175 1176 drm_mode_probed_add(connector, newmode); 1177 modes++; 1178 } 1179 1180 return modes; 1181 } 1182 1183 static void 1184 do_inferred_modes(struct detailed_timing *timing, void *c) 1185 { 1186 struct detailed_mode_closure *closure = c; 1187 struct detailed_non_pixel *data = &timing->data.other_data; 1188 struct detailed_data_monitor_range *range = &data->data.range; 1189 1190 if (data->type != EDID_DETAIL_MONITOR_RANGE) 1191 return; 1192 1193 closure->modes += drm_dmt_modes_for_range(closure->connector, 1194 closure->edid, 1195 timing); 1196 1197 if (!version_greater(closure->edid, 1, 1)) 1198 return; /* GTF not defined yet */ 1199 1200 switch (range->flags) { 1201 case 0x02: /* secondary gtf, XXX could do more */ 1202 case 0x00: /* default gtf */ 1203 closure->modes += drm_gtf_modes_for_range(closure->connector, 1204 closure->edid, 1205 timing); 1206 break; 1207 case 0x04: /* cvt, only in 1.4+ */ 1208 if (!version_greater(closure->edid, 1, 3)) 1209 break; 1210 1211 closure->modes += drm_cvt_modes_for_range(closure->connector, 1212 closure->edid, 1213 timing); 1214 break; 1215 case 0x01: /* just the ranges, no formula */ 1216 default: 1217 break; 1218 } 1219 } 1220 1221 static int 1222 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1223 { 1224 struct detailed_mode_closure closure = { 1225 connector, edid, 0, 0, 0 1226 }; 1227 1228 if (version_greater(edid, 1, 0)) 1229 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1230 &closure); 1231 1232 return closure.modes; 1233 } 1234 1235 static int 1236 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1237 { 1238 int i, j, m, modes = 0; 1239 struct drm_display_mode *mode; 1240 u8 *est = ((u8 *)timing) + 5; 1241 1242 for (i = 0; i < 6; i++) { 1243 for (j = 7; j > 0; j--) { 1244 m = (i * 8) + (7 - j); 1245 if (m >= ARRAY_SIZE(est3_modes)) 1246 break; 1247 if (est[i] & (1 << j)) { 1248 mode = drm_mode_find_dmt(connector->dev, 1249 est3_modes[m].w, 1250 est3_modes[m].h, 1251 est3_modes[m].r, 1252 est3_modes[m].rb); 1253 if (mode) { 1254 drm_mode_probed_add(connector, mode); 1255 modes++; 1256 } 1257 } 1258 } 1259 } 1260 1261 return modes; 1262 } 1263 1264 static void 1265 do_established_modes(struct detailed_timing *timing, void *c) 1266 { 1267 struct detailed_mode_closure *closure = c; 1268 struct detailed_non_pixel *data = &timing->data.other_data; 1269 1270 if (data->type == EDID_DETAIL_EST_TIMINGS) 1271 closure->modes += drm_est3_modes(closure->connector, timing); 1272 } 1273 1274 /** 1275 * add_established_modes - get est. modes from EDID and add them 1276 * @edid: EDID block to scan 1277 * 1278 * Each EDID block contains a bitmap of the supported "established modes" list 1279 * (defined above). Tease them out and add them to the global modes list. 1280 */ 1281 static int 1282 add_established_modes(struct drm_connector *connector, struct edid *edid) 1283 { 1284 struct drm_device *dev = connector->dev; 1285 unsigned long est_bits = edid->established_timings.t1 | 1286 (edid->established_timings.t2 << 8) | 1287 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1288 int i, modes = 0; 1289 struct detailed_mode_closure closure = { 1290 connector, edid, 0, 0, 0 1291 }; 1292 1293 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1294 if (est_bits & (1<<i)) { 1295 struct drm_display_mode *newmode; 1296 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1297 if (newmode) { 1298 drm_mode_probed_add(connector, newmode); 1299 modes++; 1300 } 1301 } 1302 } 1303 1304 if (version_greater(edid, 1, 0)) 1305 drm_for_each_detailed_block((u8 *)edid, 1306 do_established_modes, &closure); 1307 1308 return modes + closure.modes; 1309 } 1310 1311 static void 1312 do_standard_modes(struct detailed_timing *timing, void *c) 1313 { 1314 struct detailed_mode_closure *closure = c; 1315 struct detailed_non_pixel *data = &timing->data.other_data; 1316 struct drm_connector *connector = closure->connector; 1317 struct edid *edid = closure->edid; 1318 1319 if (data->type == EDID_DETAIL_STD_MODES) { 1320 int i; 1321 for (i = 0; i < 6; i++) { 1322 struct std_timing *std; 1323 struct drm_display_mode *newmode; 1324 1325 std = &data->data.timings[i]; 1326 newmode = drm_mode_std(connector, edid, std, 1327 edid->revision); 1328 if (newmode) { 1329 drm_mode_probed_add(connector, newmode); 1330 closure->modes++; 1331 } 1332 } 1333 } 1334 } 1335 1336 /** 1337 * add_standard_modes - get std. modes from EDID and add them 1338 * @edid: EDID block to scan 1339 * 1340 * Standard modes can be calculated using the appropriate standard (DMT, 1341 * GTF or CVT. Grab them from @edid and add them to the list. 1342 */ 1343 static int 1344 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1345 { 1346 int i, modes = 0; 1347 struct detailed_mode_closure closure = { 1348 connector, edid, 0, 0, 0 1349 }; 1350 1351 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1352 struct drm_display_mode *newmode; 1353 1354 newmode = drm_mode_std(connector, edid, 1355 &edid->standard_timings[i], 1356 edid->revision); 1357 if (newmode) { 1358 drm_mode_probed_add(connector, newmode); 1359 modes++; 1360 } 1361 } 1362 1363 if (version_greater(edid, 1, 0)) 1364 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1365 &closure); 1366 1367 /* XXX should also look for standard codes in VTB blocks */ 1368 1369 return modes + closure.modes; 1370 } 1371 1372 static int drm_cvt_modes(struct drm_connector *connector, 1373 struct detailed_timing *timing) 1374 { 1375 int i, j, modes = 0; 1376 struct drm_display_mode *newmode; 1377 struct drm_device *dev = connector->dev; 1378 struct cvt_timing *cvt; 1379 const int rates[] = { 60, 85, 75, 60, 50 }; 1380 const u8 empty[3] = { 0, 0, 0 }; 1381 1382 for (i = 0; i < 4; i++) { 1383 int width = 0, height; 1384 cvt = &(timing->data.other_data.data.cvt[i]); 1385 1386 if (!memcmp(cvt->code, empty, 3)) 1387 continue; 1388 1389 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1390 switch (cvt->code[1] & 0x0c) { 1391 case 0x00: 1392 width = height * 4 / 3; 1393 break; 1394 case 0x04: 1395 width = height * 16 / 9; 1396 break; 1397 case 0x08: 1398 width = height * 16 / 10; 1399 break; 1400 case 0x0c: 1401 width = height * 15 / 9; 1402 break; 1403 } 1404 1405 for (j = 1; j < 5; j++) { 1406 if (cvt->code[2] & (1 << j)) { 1407 newmode = drm_cvt_mode(dev, width, height, 1408 rates[j], j == 0, 1409 false, false); 1410 if (newmode) { 1411 drm_mode_probed_add(connector, newmode); 1412 modes++; 1413 } 1414 } 1415 } 1416 } 1417 1418 return modes; 1419 } 1420 1421 static void 1422 do_cvt_mode(struct detailed_timing *timing, void *c) 1423 { 1424 struct detailed_mode_closure *closure = c; 1425 struct detailed_non_pixel *data = &timing->data.other_data; 1426 1427 if (data->type == EDID_DETAIL_CVT_3BYTE) 1428 closure->modes += drm_cvt_modes(closure->connector, timing); 1429 } 1430 1431 static int 1432 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1433 { 1434 struct detailed_mode_closure closure = { 1435 connector, edid, 0, 0, 0 1436 }; 1437 1438 if (version_greater(edid, 1, 2)) 1439 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1440 1441 /* XXX should also look for CVT codes in VTB blocks */ 1442 1443 return closure.modes; 1444 } 1445 1446 static void 1447 do_detailed_mode(struct detailed_timing *timing, void *c) 1448 { 1449 struct detailed_mode_closure *closure = c; 1450 struct drm_display_mode *newmode; 1451 1452 if (timing->pixel_clock) { 1453 newmode = drm_mode_detailed(closure->connector->dev, 1454 closure->edid, timing, 1455 closure->quirks); 1456 if (!newmode) 1457 return; 1458 1459 if (closure->preferred) 1460 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1461 1462 drm_mode_probed_add(closure->connector, newmode); 1463 closure->modes++; 1464 closure->preferred = 0; 1465 } 1466 } 1467 1468 /* 1469 * add_detailed_modes - Add modes from detailed timings 1470 * @connector: attached connector 1471 * @edid: EDID block to scan 1472 * @quirks: quirks to apply 1473 */ 1474 static int 1475 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1476 u32 quirks) 1477 { 1478 struct detailed_mode_closure closure = { 1479 connector, 1480 edid, 1481 1, 1482 quirks, 1483 0 1484 }; 1485 1486 if (closure.preferred && !version_greater(edid, 1, 3)) 1487 closure.preferred = 1488 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1489 1490 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1491 1492 return closure.modes; 1493 } 1494 1495 #define HDMI_IDENTIFIER 0x000C03 1496 #define AUDIO_BLOCK 0x01 1497 #define VIDEO_BLOCK 0x02 1498 #define VENDOR_BLOCK 0x03 1499 #define SPEAKER_BLOCK 0x04 1500 #define EDID_BASIC_AUDIO (1 << 6) 1501 #define EDID_CEA_YCRCB444 (1 << 5) 1502 #define EDID_CEA_YCRCB422 (1 << 4) 1503 1504 /** 1505 * Search EDID for CEA extension block. 1506 */ 1507 u8 *drm_find_cea_extension(struct edid *edid) 1508 { 1509 u8 *edid_ext = NULL; 1510 int i; 1511 1512 /* No EDID or EDID extensions */ 1513 if (edid == NULL || edid->extensions == 0) 1514 return NULL; 1515 1516 /* Find CEA extension */ 1517 for (i = 0; i < edid->extensions; i++) { 1518 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1519 if (edid_ext[0] == CEA_EXT) 1520 break; 1521 } 1522 1523 if (i == edid->extensions) 1524 return NULL; 1525 1526 return edid_ext; 1527 } 1528 EXPORT_SYMBOL(drm_find_cea_extension); 1529 1530 /* 1531 * Looks for a CEA mode matching given drm_display_mode. 1532 * Returns its CEA Video ID code, or 0 if not found. 1533 */ 1534 u8 drm_match_cea_mode(struct drm_display_mode *to_match) 1535 { 1536 u8 mode; 1537 1538 for (mode = 0; mode < drm_num_cea_modes; mode++) { 1539 const struct drm_display_mode *cea_mode = &edid_cea_modes[mode]; 1540 1541 if (drm_mode_equal(to_match, cea_mode)) 1542 return mode + 1; 1543 } 1544 return 0; 1545 } 1546 EXPORT_SYMBOL(drm_match_cea_mode); 1547 1548 1549 static int 1550 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1551 { 1552 struct drm_device *dev = connector->dev; 1553 u8 * mode, cea_mode; 1554 int modes = 0; 1555 1556 for (mode = db; mode < db + len; mode++) { 1557 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1558 if (cea_mode < drm_num_cea_modes) { 1559 struct drm_display_mode *newmode; 1560 newmode = drm_mode_duplicate(dev, 1561 &edid_cea_modes[cea_mode]); 1562 if (newmode) { 1563 drm_mode_probed_add(connector, newmode); 1564 modes++; 1565 } 1566 } 1567 } 1568 1569 return modes; 1570 } 1571 1572 static int 1573 cea_db_payload_len(const u8 *db) 1574 { 1575 return db[0] & 0x1f; 1576 } 1577 1578 static int 1579 cea_db_tag(const u8 *db) 1580 { 1581 return db[0] >> 5; 1582 } 1583 1584 static int 1585 cea_revision(const u8 *cea) 1586 { 1587 return cea[1]; 1588 } 1589 1590 static int 1591 cea_db_offsets(const u8 *cea, int *start, int *end) 1592 { 1593 /* Data block offset in CEA extension block */ 1594 *start = 4; 1595 *end = cea[2]; 1596 if (*end == 0) 1597 *end = 127; 1598 if (*end < 4 || *end > 127) 1599 return -ERANGE; 1600 return 0; 1601 } 1602 1603 #define for_each_cea_db(cea, i, start, end) \ 1604 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1) 1605 1606 static int 1607 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1608 { 1609 u8 * cea = drm_find_cea_extension(edid); 1610 u8 * db, dbl; 1611 int modes = 0; 1612 1613 if (cea && cea_revision(cea) >= 3) { 1614 int i, start, end; 1615 1616 if (cea_db_offsets(cea, &start, &end)) 1617 return 0; 1618 1619 for_each_cea_db(cea, i, start, end) { 1620 db = &cea[i]; 1621 dbl = cea_db_payload_len(db); 1622 1623 if (cea_db_tag(db) == VIDEO_BLOCK) 1624 modes += do_cea_modes (connector, db+1, dbl); 1625 } 1626 } 1627 1628 return modes; 1629 } 1630 1631 static void 1632 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db) 1633 { 1634 u8 len = cea_db_payload_len(db); 1635 1636 if (len >= 6) { 1637 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1638 connector->dvi_dual = db[6] & 1; 1639 } 1640 if (len >= 7) 1641 connector->max_tmds_clock = db[7] * 5; 1642 if (len >= 8) { 1643 connector->latency_present[0] = db[8] >> 7; 1644 connector->latency_present[1] = (db[8] >> 6) & 1; 1645 } 1646 if (len >= 9) 1647 connector->video_latency[0] = db[9]; 1648 if (len >= 10) 1649 connector->audio_latency[0] = db[10]; 1650 if (len >= 11) 1651 connector->video_latency[1] = db[11]; 1652 if (len >= 12) 1653 connector->audio_latency[1] = db[12]; 1654 1655 DRM_DEBUG_KMS("HDMI: DVI dual %d, " 1656 "max TMDS clock %d, " 1657 "latency present %d %d, " 1658 "video latency %d %d, " 1659 "audio latency %d %d\n", 1660 connector->dvi_dual, 1661 connector->max_tmds_clock, 1662 (int) connector->latency_present[0], 1663 (int) connector->latency_present[1], 1664 connector->video_latency[0], 1665 connector->video_latency[1], 1666 connector->audio_latency[0], 1667 connector->audio_latency[1]); 1668 } 1669 1670 static void 1671 monitor_name(struct detailed_timing *t, void *data) 1672 { 1673 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1674 *(u8 **)data = t->data.other_data.data.str.str; 1675 } 1676 1677 static bool cea_db_is_hdmi_vsdb(const u8 *db) 1678 { 1679 int hdmi_id; 1680 1681 if (cea_db_tag(db) != VENDOR_BLOCK) 1682 return false; 1683 1684 if (cea_db_payload_len(db) < 5) 1685 return false; 1686 1687 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16); 1688 1689 return hdmi_id == HDMI_IDENTIFIER; 1690 } 1691 1692 /** 1693 * drm_edid_to_eld - build ELD from EDID 1694 * @connector: connector corresponding to the HDMI/DP sink 1695 * @edid: EDID to parse 1696 * 1697 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1698 * Some ELD fields are left to the graphics driver caller: 1699 * - Conn_Type 1700 * - HDCP 1701 * - Port_ID 1702 */ 1703 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1704 { 1705 uint8_t *eld = connector->eld; 1706 u8 *cea; 1707 u8 *name; 1708 u8 *db; 1709 int sad_count = 0; 1710 int mnl; 1711 int dbl; 1712 1713 memset(eld, 0, sizeof(connector->eld)); 1714 1715 cea = drm_find_cea_extension(edid); 1716 if (!cea) { 1717 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1718 return; 1719 } 1720 1721 name = NULL; 1722 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1723 for (mnl = 0; name && mnl < 13; mnl++) { 1724 if (name[mnl] == 0x0a) 1725 break; 1726 eld[20 + mnl] = name[mnl]; 1727 } 1728 eld[4] = (cea[1] << 5) | mnl; 1729 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1730 1731 eld[0] = 2 << 3; /* ELD version: 2 */ 1732 1733 eld[16] = edid->mfg_id[0]; 1734 eld[17] = edid->mfg_id[1]; 1735 eld[18] = edid->prod_code[0]; 1736 eld[19] = edid->prod_code[1]; 1737 1738 if (cea_revision(cea) >= 3) { 1739 int i, start, end; 1740 1741 if (cea_db_offsets(cea, &start, &end)) { 1742 start = 0; 1743 end = 0; 1744 } 1745 1746 for_each_cea_db(cea, i, start, end) { 1747 db = &cea[i]; 1748 dbl = cea_db_payload_len(db); 1749 1750 switch (cea_db_tag(db)) { 1751 case AUDIO_BLOCK: 1752 /* Audio Data Block, contains SADs */ 1753 sad_count = dbl / 3; 1754 if (dbl >= 1) 1755 memcpy(eld + 20 + mnl, &db[1], dbl); 1756 break; 1757 case SPEAKER_BLOCK: 1758 /* Speaker Allocation Data Block */ 1759 if (dbl >= 1) 1760 eld[7] = db[1]; 1761 break; 1762 case VENDOR_BLOCK: 1763 /* HDMI Vendor-Specific Data Block */ 1764 if (cea_db_is_hdmi_vsdb(db)) 1765 parse_hdmi_vsdb(connector, db); 1766 break; 1767 default: 1768 break; 1769 } 1770 } 1771 } 1772 eld[5] |= sad_count << 4; 1773 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1774 1775 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1776 } 1777 EXPORT_SYMBOL(drm_edid_to_eld); 1778 1779 /** 1780 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1781 * @connector: connector associated with the HDMI/DP sink 1782 * @mode: the display mode 1783 */ 1784 int drm_av_sync_delay(struct drm_connector *connector, 1785 struct drm_display_mode *mode) 1786 { 1787 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1788 int a, v; 1789 1790 if (!connector->latency_present[0]) 1791 return 0; 1792 if (!connector->latency_present[1]) 1793 i = 0; 1794 1795 a = connector->audio_latency[i]; 1796 v = connector->video_latency[i]; 1797 1798 /* 1799 * HDMI/DP sink doesn't support audio or video? 1800 */ 1801 if (a == 255 || v == 255) 1802 return 0; 1803 1804 /* 1805 * Convert raw EDID values to millisecond. 1806 * Treat unknown latency as 0ms. 1807 */ 1808 if (a) 1809 a = min(2 * (a - 1), 500); 1810 if (v) 1811 v = min(2 * (v - 1), 500); 1812 1813 return max(v - a, 0); 1814 } 1815 EXPORT_SYMBOL(drm_av_sync_delay); 1816 1817 /** 1818 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1819 * @encoder: the encoder just changed display mode 1820 * @mode: the adjusted display mode 1821 * 1822 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1823 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1824 */ 1825 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1826 struct drm_display_mode *mode) 1827 { 1828 struct drm_connector *connector; 1829 struct drm_device *dev = encoder->dev; 1830 1831 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1832 if (connector->encoder == encoder && connector->eld[0]) 1833 return connector; 1834 1835 return NULL; 1836 } 1837 EXPORT_SYMBOL(drm_select_eld); 1838 1839 /** 1840 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1841 * @edid: monitor EDID information 1842 * 1843 * Parse the CEA extension according to CEA-861-B. 1844 * Return true if HDMI, false if not or unknown. 1845 */ 1846 bool drm_detect_hdmi_monitor(struct edid *edid) 1847 { 1848 u8 *edid_ext; 1849 int i; 1850 int start_offset, end_offset; 1851 1852 edid_ext = drm_find_cea_extension(edid); 1853 if (!edid_ext) 1854 return false; 1855 1856 if (cea_db_offsets(edid_ext, &start_offset, &end_offset)) 1857 return false; 1858 1859 /* 1860 * Because HDMI identifier is in Vendor Specific Block, 1861 * search it from all data blocks of CEA extension. 1862 */ 1863 for_each_cea_db(edid_ext, i, start_offset, end_offset) { 1864 if (cea_db_is_hdmi_vsdb(&edid_ext[i])) 1865 return true; 1866 } 1867 1868 return false; 1869 } 1870 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1871 1872 /** 1873 * drm_detect_monitor_audio - check monitor audio capability 1874 * 1875 * Monitor should have CEA extension block. 1876 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1877 * audio' only. If there is any audio extension block and supported 1878 * audio format, assume at least 'basic audio' support, even if 'basic 1879 * audio' is not defined in EDID. 1880 * 1881 */ 1882 bool drm_detect_monitor_audio(struct edid *edid) 1883 { 1884 u8 *edid_ext; 1885 int i, j; 1886 bool has_audio = false; 1887 int start_offset, end_offset; 1888 1889 edid_ext = drm_find_cea_extension(edid); 1890 if (!edid_ext) 1891 goto end; 1892 1893 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1894 1895 if (has_audio) { 1896 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1897 goto end; 1898 } 1899 1900 if (cea_db_offsets(edid_ext, &start_offset, &end_offset)) 1901 goto end; 1902 1903 for_each_cea_db(edid_ext, i, start_offset, end_offset) { 1904 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) { 1905 has_audio = true; 1906 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3) 1907 DRM_DEBUG_KMS("CEA audio format %d\n", 1908 (edid_ext[i + j] >> 3) & 0xf); 1909 goto end; 1910 } 1911 } 1912 end: 1913 return has_audio; 1914 } 1915 EXPORT_SYMBOL(drm_detect_monitor_audio); 1916 1917 /** 1918 * drm_add_display_info - pull display info out if present 1919 * @edid: EDID data 1920 * @info: display info (attached to connector) 1921 * 1922 * Grab any available display info and stuff it into the drm_display_info 1923 * structure that's part of the connector. Useful for tracking bpp and 1924 * color spaces. 1925 */ 1926 static void drm_add_display_info(struct edid *edid, 1927 struct drm_display_info *info) 1928 { 1929 u8 *edid_ext; 1930 1931 info->width_mm = edid->width_cm * 10; 1932 info->height_mm = edid->height_cm * 10; 1933 1934 /* driver figures it out in this case */ 1935 info->bpc = 0; 1936 info->color_formats = 0; 1937 1938 if (edid->revision < 3) 1939 return; 1940 1941 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1942 return; 1943 1944 /* Get data from CEA blocks if present */ 1945 edid_ext = drm_find_cea_extension(edid); 1946 if (edid_ext) { 1947 info->cea_rev = edid_ext[1]; 1948 1949 /* The existence of a CEA block should imply RGB support */ 1950 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1951 if (edid_ext[3] & EDID_CEA_YCRCB444) 1952 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1953 if (edid_ext[3] & EDID_CEA_YCRCB422) 1954 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1955 } 1956 1957 /* Only defined for 1.4 with digital displays */ 1958 if (edid->revision < 4) 1959 return; 1960 1961 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1962 case DRM_EDID_DIGITAL_DEPTH_6: 1963 info->bpc = 6; 1964 break; 1965 case DRM_EDID_DIGITAL_DEPTH_8: 1966 info->bpc = 8; 1967 break; 1968 case DRM_EDID_DIGITAL_DEPTH_10: 1969 info->bpc = 10; 1970 break; 1971 case DRM_EDID_DIGITAL_DEPTH_12: 1972 info->bpc = 12; 1973 break; 1974 case DRM_EDID_DIGITAL_DEPTH_14: 1975 info->bpc = 14; 1976 break; 1977 case DRM_EDID_DIGITAL_DEPTH_16: 1978 info->bpc = 16; 1979 break; 1980 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1981 default: 1982 info->bpc = 0; 1983 break; 1984 } 1985 1986 info->color_formats |= DRM_COLOR_FORMAT_RGB444; 1987 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444) 1988 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1989 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) 1990 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1991 } 1992 1993 /** 1994 * drm_add_edid_modes - add modes from EDID data, if available 1995 * @connector: connector we're probing 1996 * @edid: edid data 1997 * 1998 * Add the specified modes to the connector's mode list. 1999 * 2000 * Return number of modes added or 0 if we couldn't find any. 2001 */ 2002 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 2003 { 2004 int num_modes = 0; 2005 u32 quirks; 2006 2007 if (edid == NULL) { 2008 return 0; 2009 } 2010 if (!drm_edid_is_valid(edid)) { 2011 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 2012 drm_get_connector_name(connector)); 2013 return 0; 2014 } 2015 2016 quirks = edid_get_quirks(edid); 2017 2018 /* 2019 * EDID spec says modes should be preferred in this order: 2020 * - preferred detailed mode 2021 * - other detailed modes from base block 2022 * - detailed modes from extension blocks 2023 * - CVT 3-byte code modes 2024 * - standard timing codes 2025 * - established timing codes 2026 * - modes inferred from GTF or CVT range information 2027 * 2028 * We get this pretty much right. 2029 * 2030 * XXX order for additional mode types in extension blocks? 2031 */ 2032 num_modes += add_detailed_modes(connector, edid, quirks); 2033 num_modes += add_cvt_modes(connector, edid); 2034 num_modes += add_standard_modes(connector, edid); 2035 num_modes += add_established_modes(connector, edid); 2036 num_modes += add_inferred_modes(connector, edid); 2037 num_modes += add_cea_modes(connector, edid); 2038 2039 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 2040 edid_fixup_preferred(connector, quirks); 2041 2042 drm_add_display_info(edid, &connector->display_info); 2043 2044 return num_modes; 2045 } 2046 EXPORT_SYMBOL(drm_add_edid_modes); 2047 2048 /** 2049 * drm_add_modes_noedid - add modes for the connectors without EDID 2050 * @connector: connector we're probing 2051 * @hdisplay: the horizontal display limit 2052 * @vdisplay: the vertical display limit 2053 * 2054 * Add the specified modes to the connector's mode list. Only when the 2055 * hdisplay/vdisplay is not beyond the given limit, it will be added. 2056 * 2057 * Return number of modes added or 0 if we couldn't find any. 2058 */ 2059 int drm_add_modes_noedid(struct drm_connector *connector, 2060 int hdisplay, int vdisplay) 2061 { 2062 int i, count, num_modes = 0; 2063 struct drm_display_mode *mode; 2064 struct drm_device *dev = connector->dev; 2065 2066 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 2067 if (hdisplay < 0) 2068 hdisplay = 0; 2069 if (vdisplay < 0) 2070 vdisplay = 0; 2071 2072 for (i = 0; i < count; i++) { 2073 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 2074 if (hdisplay && vdisplay) { 2075 /* 2076 * Only when two are valid, they will be used to check 2077 * whether the mode should be added to the mode list of 2078 * the connector. 2079 */ 2080 if (ptr->hdisplay > hdisplay || 2081 ptr->vdisplay > vdisplay) 2082 continue; 2083 } 2084 if (drm_mode_vrefresh(ptr) > 61) 2085 continue; 2086 mode = drm_mode_duplicate(dev, ptr); 2087 if (mode) { 2088 drm_mode_probed_add(connector, mode); 2089 num_modes++; 2090 } 2091 } 2092 return num_modes; 2093 } 2094 EXPORT_SYMBOL(drm_add_modes_noedid); 2095 2096 /** 2097 * drm_mode_cea_vic - return the CEA-861 VIC of a given mode 2098 * @mode: mode 2099 * 2100 * RETURNS: 2101 * The VIC number, 0 in case it's not a CEA-861 mode. 2102 */ 2103 uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode) 2104 { 2105 uint8_t i; 2106 2107 for (i = 0; i < drm_num_cea_modes; i++) 2108 if (drm_mode_equal(mode, &edid_cea_modes[i])) 2109 return i + 1; 2110 2111 return 0; 2112 } 2113 EXPORT_SYMBOL(drm_mode_cea_vic); 2114