drm_edid.c revision 1.2.4.2
1 /* 2 * Copyright (c) 2006 Luc Verhaegen (quirks list) 3 * Copyright (c) 2007-2008 Intel Corporation 4 * Jesse Barnes <jesse.barnes (at) 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 (at) 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 <linux/moduleparam.h> 35 #include <linux/export.h> 36 #include <linux/printk.h> 37 #include <linux/device.h> 38 #include <linux/string.h> 39 #include <asm/byteorder.h> 40 #include <drm/drmP.h> 41 #include <drm/drm_edid.h> 42 #include "drm_edid_modes.h" 43 44 #define version_greater(edid, maj, min) \ 45 (((edid)->version > (maj)) || \ 46 ((edid)->version == (maj) && (edid)->revision > (min))) 47 48 #define EDID_EST_TIMINGS 16 49 #define EDID_STD_TIMINGS 8 50 #define EDID_DETAILED_TIMINGS 4 51 52 /* 53 * EDID blocks out in the wild have a variety of bugs, try to collect 54 * them here (note that userspace may work around broken monitors first, 55 * but fixes should make their way here so that the kernel "just works" 56 * on as many displays as possible). 57 */ 58 59 /* First detailed mode wrong, use largest 60Hz mode */ 60 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 61 /* Reported 135MHz pixel clock is too high, needs adjustment */ 62 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 63 /* Prefer the largest mode at 75 Hz */ 64 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 65 /* Detail timing is in cm not mm */ 66 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 67 /* Detailed timing descriptors have bogus size values, so just take the 68 * maximum size and use that. 69 */ 70 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 71 /* Monitor forgot to set the first detailed is preferred bit. */ 72 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 73 /* use +hsync +vsync for detailed mode */ 74 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 75 /* Force reduced-blanking timings for detailed modes */ 76 #define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7) 77 78 struct detailed_mode_closure { 79 struct drm_connector *connector; 80 struct edid *edid; 81 bool preferred; 82 u32 quirks; 83 int modes; 84 }; 85 86 #define LEVEL_DMT 0 87 #define LEVEL_GTF 1 88 #define LEVEL_GTF2 2 89 #define LEVEL_CVT 3 90 91 static struct edid_quirk { 92 char vendor[4]; 93 int product_id; 94 u32 quirks; 95 } edid_quirk_list[] = { 96 /* ASUS VW222S */ 97 { "ACI", 0x22a2, EDID_QUIRK_FORCE_REDUCED_BLANKING }, 98 99 /* Acer AL1706 */ 100 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 101 /* Acer F51 */ 102 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 103 /* Unknown Acer */ 104 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 105 106 /* Belinea 10 15 55 */ 107 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 108 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 109 110 /* Envision Peripherals, Inc. EN-7100e */ 111 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 112 /* Envision EN2028 */ 113 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, 114 115 /* Funai Electronics PM36B */ 116 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 117 EDID_QUIRK_DETAILED_IN_CM }, 118 119 /* LG Philips LCD LP154W01-A5 */ 120 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 121 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 122 123 /* Philips 107p5 CRT */ 124 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 125 126 /* Proview AY765C */ 127 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 128 129 /* Samsung SyncMaster 205BW. Note: irony */ 130 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 131 /* Samsung SyncMaster 22[5-6]BW */ 132 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 133 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 134 135 /* ViewSonic VA2026w */ 136 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING }, 137 }; 138 139 /*** DDC fetch and block validation ***/ 140 141 static const u8 edid_header[] = { 142 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 143 }; 144 145 /* 146 * Sanity check the header of the base EDID block. Return 8 if the header 147 * is perfect, down to 0 if it's totally wrong. 148 */ 149 int drm_edid_header_is_valid(const u8 *raw_edid) 150 { 151 int i, score = 0; 152 153 for (i = 0; i < sizeof(edid_header); i++) 154 if (raw_edid[i] == edid_header[i]) 155 score++; 156 157 return score; 158 } 159 EXPORT_SYMBOL(drm_edid_header_is_valid); 160 161 static int edid_fixup __read_mostly = 6; 162 module_param_named(edid_fixup, edid_fixup, int, 0400); 163 MODULE_PARM_DESC(edid_fixup, 164 "Minimum number of valid EDID header bytes (0-8, default 6)"); 165 166 /* 167 * Sanity check the EDID block (base or extension). Return 0 if the block 168 * doesn't check out, or 1 if it's valid. 169 */ 170 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid) 171 { 172 int i; 173 u8 csum = 0; 174 struct edid *edid = (struct edid *)raw_edid; 175 176 if (edid_fixup > 8 || edid_fixup < 0) 177 edid_fixup = 6; 178 179 if (block == 0) { 180 int score = drm_edid_header_is_valid(raw_edid); 181 if (score == 8) ; 182 else if (score >= edid_fixup) { 183 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); 184 memcpy(raw_edid, edid_header, sizeof(edid_header)); 185 } else { 186 goto bad; 187 } 188 } 189 190 for (i = 0; i < EDID_LENGTH; i++) 191 csum += raw_edid[i]; 192 if (csum) { 193 if (print_bad_edid) { 194 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 195 } 196 197 /* allow CEA to slide through, switches mangle this */ 198 if (raw_edid[0] != 0x02) 199 goto bad; 200 } 201 202 /* per-block-type checks */ 203 switch (raw_edid[0]) { 204 case 0: /* base */ 205 if (edid->version != 1) { 206 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 207 goto bad; 208 } 209 210 if (edid->revision > 4) 211 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 212 break; 213 214 default: 215 break; 216 } 217 218 return 1; 219 220 bad: 221 if (raw_edid && print_bad_edid) { 222 printk(KERN_ERR "Raw EDID:\n"); 223 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1, 224 raw_edid, EDID_LENGTH, false); 225 } 226 return 0; 227 } 228 EXPORT_SYMBOL(drm_edid_block_valid); 229 230 /** 231 * drm_edid_is_valid - sanity check EDID data 232 * @edid: EDID data 233 * 234 * Sanity-check an entire EDID record (including extensions) 235 */ 236 bool drm_edid_is_valid(struct edid *edid) 237 { 238 int i; 239 u8 *raw = (u8 *)edid; 240 241 if (!edid) 242 return false; 243 244 for (i = 0; i <= edid->extensions; i++) 245 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true)) 246 return false; 247 248 return true; 249 } 250 EXPORT_SYMBOL(drm_edid_is_valid); 251 252 #define DDC_SEGMENT_ADDR 0x30 253 /** 254 * Get EDID information via I2C. 255 * 256 * \param adapter : i2c device adaptor 257 * \param buf : EDID data buffer to be filled 258 * \param len : EDID data buffer length 259 * \return 0 on success or -1 on failure. 260 * 261 * Try to fetch EDID information by calling i2c driver function. 262 */ 263 static int 264 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, 265 int block, int len) 266 { 267 unsigned char start = block * EDID_LENGTH; 268 unsigned char segment = block >> 1; 269 unsigned char xfers = segment ? 3 : 2; 270 int ret, retries = 5; 271 272 /* The core i2c driver will automatically retry the transfer if the 273 * adapter reports EAGAIN. However, we find that bit-banging transfers 274 * are susceptible to errors under a heavily loaded machine and 275 * generate spurious NAKs and timeouts. Retrying the transfer 276 * of the individual block a few times seems to overcome this. 277 */ 278 do { 279 struct i2c_msg msgs[] = { 280 { 281 .addr = DDC_SEGMENT_ADDR, 282 .flags = 0, 283 .len = 1, 284 .buf = &segment, 285 }, { 286 .addr = DDC_ADDR, 287 .flags = 0, 288 .len = 1, 289 .buf = &start, 290 }, { 291 .addr = DDC_ADDR, 292 .flags = I2C_M_RD, 293 .len = len, 294 .buf = buf, 295 } 296 }; 297 298 /* 299 * Avoid sending the segment addr to not upset non-compliant ddc 300 * monitors. 301 */ 302 ret = i2c_transfer(adapter, &msgs[3 - xfers], xfers); 303 304 if (ret == -ENXIO) { 305 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n", 306 adapter->name); 307 break; 308 } 309 } while (ret != xfers && --retries); 310 311 return ret == xfers ? 0 : -1; 312 } 313 314 static bool drm_edid_is_zero(u8 *in_edid, int length) 315 { 316 if (memchr_inv(in_edid, 0, length)) 317 return false; 318 319 return true; 320 } 321 322 static u8 * 323 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) 324 { 325 int i, j = 0, valid_extensions = 0; 326 u8 *block, *new; 327 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS); 328 329 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) 330 return NULL; 331 332 /* base block fetch */ 333 for (i = 0; i < 4; i++) { 334 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) 335 goto out; 336 if (drm_edid_block_valid(block, 0, print_bad_edid)) 337 break; 338 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { 339 connector->null_edid_counter++; 340 goto carp; 341 } 342 } 343 if (i == 4) 344 goto carp; 345 346 /* if there's no extensions, we're done */ 347 if (block[0x7e] == 0) 348 return block; 349 350 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); 351 if (!new) 352 goto out; 353 block = new; 354 355 for (j = 1; j <= block[0x7e]; j++) { 356 for (i = 0; i < 4; i++) { 357 if (drm_do_probe_ddc_edid(adapter, 358 block + (valid_extensions + 1) * EDID_LENGTH, 359 j, EDID_LENGTH)) 360 goto out; 361 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) { 362 valid_extensions++; 363 break; 364 } 365 } 366 if (i == 4) 367 dev_warn(connector->dev->dev, 368 "%s: Ignoring invalid EDID block %d.\n", 369 drm_get_connector_name(connector), j); 370 } 371 372 if (valid_extensions != block[0x7e]) { 373 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; 374 block[0x7e] = valid_extensions; 375 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); 376 if (!new) 377 goto out; 378 block = new; 379 } 380 381 return block; 382 383 carp: 384 if (print_bad_edid) { 385 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", 386 drm_get_connector_name(connector), j); 387 } 388 connector->bad_edid_counter++; 389 390 out: 391 kfree(block); 392 return NULL; 393 } 394 395 /** 396 * Probe DDC presence. 397 * 398 * \param adapter : i2c device adaptor 399 * \return 1 on success 400 */ 401 bool 402 drm_probe_ddc(struct i2c_adapter *adapter) 403 { 404 unsigned char out; 405 406 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); 407 } 408 EXPORT_SYMBOL(drm_probe_ddc); 409 410 /** 411 * drm_get_edid - get EDID data, if available 412 * @connector: connector we're probing 413 * @adapter: i2c adapter to use for DDC 414 * 415 * Poke the given i2c channel to grab EDID data if possible. If found, 416 * attach it to the connector. 417 * 418 * Return edid data or NULL if we couldn't find any. 419 */ 420 struct edid *drm_get_edid(struct drm_connector *connector, 421 struct i2c_adapter *adapter) 422 { 423 struct edid *edid = NULL; 424 425 if (drm_probe_ddc(adapter)) 426 edid = (struct edid *)drm_do_get_edid(connector, adapter); 427 428 return edid; 429 } 430 EXPORT_SYMBOL(drm_get_edid); 431 432 /*** EDID parsing ***/ 433 434 /** 435 * edid_vendor - match a string against EDID's obfuscated vendor field 436 * @edid: EDID to match 437 * @vendor: vendor string 438 * 439 * Returns true if @vendor is in @edid, false otherwise 440 */ 441 static bool edid_vendor(struct edid *edid, char *vendor) 442 { 443 char edid_vendor[3]; 444 445 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 446 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 447 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 448 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 449 450 return !strncmp(edid_vendor, vendor, 3); 451 } 452 453 /** 454 * edid_get_quirks - return quirk flags for a given EDID 455 * @edid: EDID to process 456 * 457 * This tells subsequent routines what fixes they need to apply. 458 */ 459 static u32 edid_get_quirks(struct edid *edid) 460 { 461 struct edid_quirk *quirk; 462 int i; 463 464 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 465 quirk = &edid_quirk_list[i]; 466 467 if (edid_vendor(edid, quirk->vendor) && 468 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 469 return quirk->quirks; 470 } 471 472 return 0; 473 } 474 475 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 476 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 477 478 /** 479 * edid_fixup_preferred - set preferred modes based on quirk list 480 * @connector: has mode list to fix up 481 * @quirks: quirks list 482 * 483 * Walk the mode list for @connector, clearing the preferred status 484 * on existing modes and setting it anew for the right mode ala @quirks. 485 */ 486 static void edid_fixup_preferred(struct drm_connector *connector, 487 u32 quirks) 488 { 489 struct drm_display_mode *t, *cur_mode, *preferred_mode; 490 int target_refresh = 0; 491 492 if (list_empty(&connector->probed_modes)) 493 return; 494 495 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 496 target_refresh = 60; 497 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 498 target_refresh = 75; 499 500 preferred_mode = list_first_entry(&connector->probed_modes, 501 struct drm_display_mode, head); 502 503 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 504 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 505 506 if (cur_mode == preferred_mode) 507 continue; 508 509 /* Largest mode is preferred */ 510 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 511 preferred_mode = cur_mode; 512 513 /* At a given size, try to get closest to target refresh */ 514 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 515 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 516 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 517 preferred_mode = cur_mode; 518 } 519 } 520 521 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 522 } 523 524 static bool 525 mode_is_rb(const struct drm_display_mode *mode) 526 { 527 return (mode->htotal - mode->hdisplay == 160) && 528 (mode->hsync_end - mode->hdisplay == 80) && 529 (mode->hsync_end - mode->hsync_start == 32) && 530 (mode->vsync_start - mode->vdisplay == 3); 531 } 532 533 /* 534 * drm_mode_find_dmt - Create a copy of a mode if present in DMT 535 * @dev: Device to duplicate against 536 * @hsize: Mode width 537 * @vsize: Mode height 538 * @fresh: Mode refresh rate 539 * @rb: Mode reduced-blanking-ness 540 * 541 * Walk the DMT mode list looking for a match for the given parameters. 542 * Return a newly allocated copy of the mode, or NULL if not found. 543 */ 544 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, 545 int hsize, int vsize, int fresh, 546 bool rb) 547 { 548 int i; 549 550 for (i = 0; i < drm_num_dmt_modes; i++) { 551 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 552 if (hsize != ptr->hdisplay) 553 continue; 554 if (vsize != ptr->vdisplay) 555 continue; 556 if (fresh != drm_mode_vrefresh(ptr)) 557 continue; 558 if (rb != mode_is_rb(ptr)) 559 continue; 560 561 return drm_mode_duplicate(dev, ptr); 562 } 563 564 return NULL; 565 } 566 EXPORT_SYMBOL(drm_mode_find_dmt); 567 568 typedef void detailed_cb(struct detailed_timing *timing, void *closure); 569 570 static void 571 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 572 { 573 int i, n = 0; 574 u8 d = ext[0x02]; 575 u8 *det_base = ext + d; 576 577 n = (127 - d) / 18; 578 for (i = 0; i < n; i++) 579 cb((struct detailed_timing *)(det_base + 18 * i), closure); 580 } 581 582 static void 583 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) 584 { 585 unsigned int i, n = min((int)ext[0x02], 6); 586 u8 *det_base = ext + 5; 587 588 if (ext[0x01] != 1) 589 return; /* unknown version */ 590 591 for (i = 0; i < n; i++) 592 cb((struct detailed_timing *)(det_base + 18 * i), closure); 593 } 594 595 static void 596 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) 597 { 598 int i; 599 struct edid *edid = (struct edid *)raw_edid; 600 601 if (edid == NULL) 602 return; 603 604 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) 605 cb(&(edid->detailed_timings[i]), closure); 606 607 for (i = 1; i <= raw_edid[0x7e]; i++) { 608 u8 *ext = raw_edid + (i * EDID_LENGTH); 609 switch (*ext) { 610 case CEA_EXT: 611 cea_for_each_detailed_block(ext, cb, closure); 612 break; 613 case VTB_EXT: 614 vtb_for_each_detailed_block(ext, cb, closure); 615 break; 616 default: 617 break; 618 } 619 } 620 } 621 622 static void 623 is_rb(struct detailed_timing *t, void *data) 624 { 625 u8 *r = (u8 *)t; 626 if (r[3] == EDID_DETAIL_MONITOR_RANGE) 627 if (r[15] & 0x10) 628 *(bool *)data = true; 629 } 630 631 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ 632 static bool 633 drm_monitor_supports_rb(struct edid *edid) 634 { 635 if (edid->revision >= 4) { 636 bool ret = false; 637 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); 638 return ret; 639 } 640 641 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); 642 } 643 644 static void 645 find_gtf2(struct detailed_timing *t, void *data) 646 { 647 u8 *r = (u8 *)t; 648 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) 649 *(u8 **)data = r; 650 } 651 652 /* Secondary GTF curve kicks in above some break frequency */ 653 static int 654 drm_gtf2_hbreak(struct edid *edid) 655 { 656 u8 *r = NULL; 657 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 658 return r ? (r[12] * 2) : 0; 659 } 660 661 static int 662 drm_gtf2_2c(struct edid *edid) 663 { 664 u8 *r = NULL; 665 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 666 return r ? r[13] : 0; 667 } 668 669 static int 670 drm_gtf2_m(struct edid *edid) 671 { 672 u8 *r = NULL; 673 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 674 return r ? (r[15] << 8) + r[14] : 0; 675 } 676 677 static int 678 drm_gtf2_k(struct edid *edid) 679 { 680 u8 *r = NULL; 681 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 682 return r ? r[16] : 0; 683 } 684 685 static int 686 drm_gtf2_2j(struct edid *edid) 687 { 688 u8 *r = NULL; 689 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); 690 return r ? r[17] : 0; 691 } 692 693 /** 694 * standard_timing_level - get std. timing level(CVT/GTF/DMT) 695 * @edid: EDID block to scan 696 */ 697 static int standard_timing_level(struct edid *edid) 698 { 699 if (edid->revision >= 2) { 700 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 701 return LEVEL_CVT; 702 if (drm_gtf2_hbreak(edid)) 703 return LEVEL_GTF2; 704 return LEVEL_GTF; 705 } 706 return LEVEL_DMT; 707 } 708 709 /* 710 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old 711 * monitors fill with ascii space (0x20) instead. 712 */ 713 static int 714 bad_std_timing(u8 a, u8 b) 715 { 716 return (a == 0x00 && b == 0x00) || 717 (a == 0x01 && b == 0x01) || 718 (a == 0x20 && b == 0x20); 719 } 720 721 /** 722 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 723 * @t: standard timing params 724 * @timing_level: standard timing level 725 * 726 * Take the standard timing params (in this case width, aspect, and refresh) 727 * and convert them into a real mode using CVT/GTF/DMT. 728 */ 729 static struct drm_display_mode * 730 drm_mode_std(struct drm_connector *connector, struct edid *edid, 731 struct std_timing *t, int revision) 732 { 733 struct drm_device *dev = connector->dev; 734 struct drm_display_mode *m, *mode = NULL; 735 int hsize, vsize; 736 int vrefresh_rate; 737 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 738 >> EDID_TIMING_ASPECT_SHIFT; 739 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 740 >> EDID_TIMING_VFREQ_SHIFT; 741 int timing_level = standard_timing_level(edid); 742 743 if (bad_std_timing(t->hsize, t->vfreq_aspect)) 744 return NULL; 745 746 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 747 hsize = t->hsize * 8 + 248; 748 /* vrefresh_rate = vfreq + 60 */ 749 vrefresh_rate = vfreq + 60; 750 /* the vdisplay is calculated based on the aspect ratio */ 751 if (aspect_ratio == 0) { 752 if (revision < 3) 753 vsize = hsize; 754 else 755 vsize = (hsize * 10) / 16; 756 } else if (aspect_ratio == 1) 757 vsize = (hsize * 3) / 4; 758 else if (aspect_ratio == 2) 759 vsize = (hsize * 4) / 5; 760 else 761 vsize = (hsize * 9) / 16; 762 763 /* HDTV hack, part 1 */ 764 if (vrefresh_rate == 60 && 765 ((hsize == 1360 && vsize == 765) || 766 (hsize == 1368 && vsize == 769))) { 767 hsize = 1366; 768 vsize = 768; 769 } 770 771 /* 772 * If this connector already has a mode for this size and refresh 773 * rate (because it came from detailed or CVT info), use that 774 * instead. This way we don't have to guess at interlace or 775 * reduced blanking. 776 */ 777 list_for_each_entry(m, &connector->probed_modes, head) 778 if (m->hdisplay == hsize && m->vdisplay == vsize && 779 drm_mode_vrefresh(m) == vrefresh_rate) 780 return NULL; 781 782 /* HDTV hack, part 2 */ 783 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { 784 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, 785 false); 786 mode->hdisplay = 1366; 787 mode->hsync_start = mode->hsync_start - 1; 788 mode->hsync_end = mode->hsync_end - 1; 789 return mode; 790 } 791 792 /* check whether it can be found in default mode table */ 793 if (drm_monitor_supports_rb(edid)) { 794 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, 795 true); 796 if (mode) 797 return mode; 798 } 799 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false); 800 if (mode) 801 return mode; 802 803 /* okay, generate it */ 804 switch (timing_level) { 805 case LEVEL_DMT: 806 break; 807 case LEVEL_GTF: 808 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 809 break; 810 case LEVEL_GTF2: 811 /* 812 * This is potentially wrong if there's ever a monitor with 813 * more than one ranges section, each claiming a different 814 * secondary GTF curve. Please don't do that. 815 */ 816 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 817 if (!mode) 818 return NULL; 819 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { 820 drm_mode_destroy(dev, mode); 821 mode = drm_gtf_mode_complex(dev, hsize, vsize, 822 vrefresh_rate, 0, 0, 823 drm_gtf2_m(edid), 824 drm_gtf2_2c(edid), 825 drm_gtf2_k(edid), 826 drm_gtf2_2j(edid)); 827 } 828 break; 829 case LEVEL_CVT: 830 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, 831 false); 832 break; 833 } 834 return mode; 835 } 836 837 /* 838 * EDID is delightfully ambiguous about how interlaced modes are to be 839 * encoded. Our internal representation is of frame height, but some 840 * HDTV detailed timings are encoded as field height. 841 * 842 * The format list here is from CEA, in frame size. Technically we 843 * should be checking refresh rate too. Whatever. 844 */ 845 static void 846 drm_mode_do_interlace_quirk(struct drm_display_mode *mode, 847 struct detailed_pixel_timing *pt) 848 { 849 int i; 850 static const struct { 851 int w, h; 852 } cea_interlaced[] = { 853 { 1920, 1080 }, 854 { 720, 480 }, 855 { 1440, 480 }, 856 { 2880, 480 }, 857 { 720, 576 }, 858 { 1440, 576 }, 859 { 2880, 576 }, 860 }; 861 862 if (!(pt->misc & DRM_EDID_PT_INTERLACED)) 863 return; 864 865 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { 866 if ((mode->hdisplay == cea_interlaced[i].w) && 867 (mode->vdisplay == cea_interlaced[i].h / 2)) { 868 mode->vdisplay *= 2; 869 mode->vsync_start *= 2; 870 mode->vsync_end *= 2; 871 mode->vtotal *= 2; 872 mode->vtotal |= 1; 873 } 874 } 875 876 mode->flags |= DRM_MODE_FLAG_INTERLACE; 877 } 878 879 /** 880 * drm_mode_detailed - create a new mode from an EDID detailed timing section 881 * @dev: DRM device (needed to create new mode) 882 * @edid: EDID block 883 * @timing: EDID detailed timing info 884 * @quirks: quirks to apply 885 * 886 * An EDID detailed timing block contains enough info for us to create and 887 * return a new struct drm_display_mode. 888 */ 889 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 890 struct edid *edid, 891 struct detailed_timing *timing, 892 u32 quirks) 893 { 894 struct drm_display_mode *mode; 895 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 896 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 897 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 898 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 899 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 900 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 901 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 902 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 903 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 904 905 /* ignore tiny modes */ 906 if (hactive < 64 || vactive < 64) 907 return NULL; 908 909 if (pt->misc & DRM_EDID_PT_STEREO) { 910 printk(KERN_WARNING "stereo mode not supported\n"); 911 return NULL; 912 } 913 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 914 printk(KERN_WARNING "composite sync not supported\n"); 915 } 916 917 /* it is incorrect if hsync/vsync width is zero */ 918 if (!hsync_pulse_width || !vsync_pulse_width) { 919 DRM_DEBUG_KMS("Incorrect Detailed timing. " 920 "Wrong Hsync/Vsync pulse width\n"); 921 return NULL; 922 } 923 924 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) { 925 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false); 926 if (!mode) 927 return NULL; 928 929 goto set_size; 930 } 931 932 mode = drm_mode_create(dev); 933 if (!mode) 934 return NULL; 935 936 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 937 timing->pixel_clock = cpu_to_le16(1088); 938 939 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 940 941 mode->hdisplay = hactive; 942 mode->hsync_start = mode->hdisplay + hsync_offset; 943 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 944 mode->htotal = mode->hdisplay + hblank; 945 946 mode->vdisplay = vactive; 947 mode->vsync_start = mode->vdisplay + vsync_offset; 948 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 949 mode->vtotal = mode->vdisplay + vblank; 950 951 /* Some EDIDs have bogus h/vtotal values */ 952 if (mode->hsync_end > mode->htotal) 953 mode->htotal = mode->hsync_end + 1; 954 if (mode->vsync_end > mode->vtotal) 955 mode->vtotal = mode->vsync_end + 1; 956 957 drm_mode_do_interlace_quirk(mode, pt); 958 959 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 960 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 961 } 962 963 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 964 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 965 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 966 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 967 968 set_size: 969 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 970 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 971 972 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 973 mode->width_mm *= 10; 974 mode->height_mm *= 10; 975 } 976 977 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 978 mode->width_mm = edid->width_cm * 10; 979 mode->height_mm = edid->height_cm * 10; 980 } 981 982 mode->type = DRM_MODE_TYPE_DRIVER; 983 drm_mode_set_name(mode); 984 985 return mode; 986 } 987 988 static bool 989 mode_in_hsync_range(const struct drm_display_mode *mode, 990 struct edid *edid, u8 *t) 991 { 992 int hsync, hmin, hmax; 993 994 hmin = t[7]; 995 if (edid->revision >= 4) 996 hmin += ((t[4] & 0x04) ? 255 : 0); 997 hmax = t[8]; 998 if (edid->revision >= 4) 999 hmax += ((t[4] & 0x08) ? 255 : 0); 1000 hsync = drm_mode_hsync(mode); 1001 1002 return (hsync <= hmax && hsync >= hmin); 1003 } 1004 1005 static bool 1006 mode_in_vsync_range(const struct drm_display_mode *mode, 1007 struct edid *edid, u8 *t) 1008 { 1009 int vsync, vmin, vmax; 1010 1011 vmin = t[5]; 1012 if (edid->revision >= 4) 1013 vmin += ((t[4] & 0x01) ? 255 : 0); 1014 vmax = t[6]; 1015 if (edid->revision >= 4) 1016 vmax += ((t[4] & 0x02) ? 255 : 0); 1017 vsync = drm_mode_vrefresh(mode); 1018 1019 return (vsync <= vmax && vsync >= vmin); 1020 } 1021 1022 static u32 1023 range_pixel_clock(struct edid *edid, u8 *t) 1024 { 1025 /* unspecified */ 1026 if (t[9] == 0 || t[9] == 255) 1027 return 0; 1028 1029 /* 1.4 with CVT support gives us real precision, yay */ 1030 if (edid->revision >= 4 && t[10] == 0x04) 1031 return (t[9] * 10000) - ((t[12] >> 2) * 250); 1032 1033 /* 1.3 is pathetic, so fuzz up a bit */ 1034 return t[9] * 10000 + 5001; 1035 } 1036 1037 static bool 1038 mode_in_range(const struct drm_display_mode *mode, struct edid *edid, 1039 struct detailed_timing *timing) 1040 { 1041 u32 max_clock; 1042 u8 *t = (u8 *)timing; 1043 1044 if (!mode_in_hsync_range(mode, edid, t)) 1045 return false; 1046 1047 if (!mode_in_vsync_range(mode, edid, t)) 1048 return false; 1049 1050 if ((max_clock = range_pixel_clock(edid, t))) 1051 if (mode->clock > max_clock) 1052 return false; 1053 1054 /* 1.4 max horizontal check */ 1055 if (edid->revision >= 4 && t[10] == 0x04) 1056 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) 1057 return false; 1058 1059 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) 1060 return false; 1061 1062 return true; 1063 } 1064 1065 static bool valid_inferred_mode(const struct drm_connector *connector, 1066 const struct drm_display_mode *mode) 1067 { 1068 struct drm_display_mode *m; 1069 bool ok = false; 1070 1071 list_for_each_entry(m, &connector->probed_modes, head) { 1072 if (mode->hdisplay == m->hdisplay && 1073 mode->vdisplay == m->vdisplay && 1074 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m)) 1075 return false; /* duplicated */ 1076 if (mode->hdisplay <= m->hdisplay && 1077 mode->vdisplay <= m->vdisplay) 1078 ok = true; 1079 } 1080 return ok; 1081 } 1082 1083 static int 1084 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1085 struct detailed_timing *timing) 1086 { 1087 int i, modes = 0; 1088 struct drm_display_mode *newmode; 1089 struct drm_device *dev = connector->dev; 1090 1091 for (i = 0; i < drm_num_dmt_modes; i++) { 1092 if (mode_in_range(drm_dmt_modes + i, edid, timing) && 1093 valid_inferred_mode(connector, drm_dmt_modes + i)) { 1094 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); 1095 if (newmode) { 1096 drm_mode_probed_add(connector, newmode); 1097 modes++; 1098 } 1099 } 1100 } 1101 1102 return modes; 1103 } 1104 1105 /* fix up 1366x768 mode from 1368x768; 1106 * GFT/CVT can't express 1366 width which isn't dividable by 8 1107 */ 1108 static void fixup_mode_1366x768(struct drm_display_mode *mode) 1109 { 1110 if (mode->hdisplay == 1368 && mode->vdisplay == 768) { 1111 mode->hdisplay = 1366; 1112 mode->hsync_start--; 1113 mode->hsync_end--; 1114 drm_mode_set_name(mode); 1115 } 1116 } 1117 1118 static int 1119 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 1120 struct detailed_timing *timing) 1121 { 1122 int i, modes = 0; 1123 struct drm_display_mode *newmode; 1124 struct drm_device *dev = connector->dev; 1125 1126 for (i = 0; i < num_extra_modes; i++) { 1127 const struct minimode *m = &extra_modes[i]; 1128 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0); 1129 if (!newmode) 1130 return modes; 1131 1132 fixup_mode_1366x768(newmode); 1133 if (!mode_in_range(newmode, edid, timing) || 1134 !valid_inferred_mode(connector, newmode)) { 1135 drm_mode_destroy(dev, newmode); 1136 continue; 1137 } 1138 1139 drm_mode_probed_add(connector, newmode); 1140 modes++; 1141 } 1142 1143 return modes; 1144 } 1145 1146 static int 1147 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 1148 struct detailed_timing *timing) 1149 { 1150 int i, modes = 0; 1151 struct drm_display_mode *newmode; 1152 struct drm_device *dev = connector->dev; 1153 bool rb = drm_monitor_supports_rb(edid); 1154 1155 for (i = 0; i < num_extra_modes; i++) { 1156 const struct minimode *m = &extra_modes[i]; 1157 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0); 1158 if (!newmode) 1159 return modes; 1160 1161 fixup_mode_1366x768(newmode); 1162 if (!mode_in_range(newmode, edid, timing) || 1163 !valid_inferred_mode(connector, newmode)) { 1164 drm_mode_destroy(dev, newmode); 1165 continue; 1166 } 1167 1168 drm_mode_probed_add(connector, newmode); 1169 modes++; 1170 } 1171 1172 return modes; 1173 } 1174 1175 static void 1176 do_inferred_modes(struct detailed_timing *timing, void *c) 1177 { 1178 struct detailed_mode_closure *closure = c; 1179 struct detailed_non_pixel *data = &timing->data.other_data; 1180 struct detailed_data_monitor_range *range = &data->data.range; 1181 1182 if (data->type != EDID_DETAIL_MONITOR_RANGE) 1183 return; 1184 1185 closure->modes += drm_dmt_modes_for_range(closure->connector, 1186 closure->edid, 1187 timing); 1188 1189 if (!version_greater(closure->edid, 1, 1)) 1190 return; /* GTF not defined yet */ 1191 1192 switch (range->flags) { 1193 case 0x02: /* secondary gtf, XXX could do more */ 1194 case 0x00: /* default gtf */ 1195 closure->modes += drm_gtf_modes_for_range(closure->connector, 1196 closure->edid, 1197 timing); 1198 break; 1199 case 0x04: /* cvt, only in 1.4+ */ 1200 if (!version_greater(closure->edid, 1, 3)) 1201 break; 1202 1203 closure->modes += drm_cvt_modes_for_range(closure->connector, 1204 closure->edid, 1205 timing); 1206 break; 1207 case 0x01: /* just the ranges, no formula */ 1208 default: 1209 break; 1210 } 1211 } 1212 1213 static int 1214 add_inferred_modes(struct drm_connector *connector, struct edid *edid) 1215 { 1216 struct detailed_mode_closure closure = { 1217 connector, edid, 0, 0, 0 1218 }; 1219 1220 if (version_greater(edid, 1, 0)) 1221 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, 1222 &closure); 1223 1224 return closure.modes; 1225 } 1226 1227 static int 1228 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) 1229 { 1230 int i, j, m, modes = 0; 1231 struct drm_display_mode *mode; 1232 u8 *est = ((u8 *)timing) + 5; 1233 1234 for (i = 0; i < 6; i++) { 1235 for (j = 7; j > 0; j--) { 1236 m = (i * 8) + (7 - j); 1237 if (m >= ARRAY_SIZE(est3_modes)) 1238 break; 1239 if (est[i] & (1 << j)) { 1240 mode = drm_mode_find_dmt(connector->dev, 1241 est3_modes[m].w, 1242 est3_modes[m].h, 1243 est3_modes[m].r, 1244 est3_modes[m].rb); 1245 if (mode) { 1246 drm_mode_probed_add(connector, mode); 1247 modes++; 1248 } 1249 } 1250 } 1251 } 1252 1253 return modes; 1254 } 1255 1256 static void 1257 do_established_modes(struct detailed_timing *timing, void *c) 1258 { 1259 struct detailed_mode_closure *closure = c; 1260 struct detailed_non_pixel *data = &timing->data.other_data; 1261 1262 if (data->type == EDID_DETAIL_EST_TIMINGS) 1263 closure->modes += drm_est3_modes(closure->connector, timing); 1264 } 1265 1266 /** 1267 * add_established_modes - get est. modes from EDID and add them 1268 * @edid: EDID block to scan 1269 * 1270 * Each EDID block contains a bitmap of the supported "established modes" list 1271 * (defined above). Tease them out and add them to the global modes list. 1272 */ 1273 static int 1274 add_established_modes(struct drm_connector *connector, struct edid *edid) 1275 { 1276 struct drm_device *dev = connector->dev; 1277 unsigned long est_bits = edid->established_timings.t1 | 1278 (edid->established_timings.t2 << 8) | 1279 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 1280 int i, modes = 0; 1281 struct detailed_mode_closure closure = { 1282 connector, edid, 0, 0, 0 1283 }; 1284 1285 for (i = 0; i <= EDID_EST_TIMINGS; i++) { 1286 if (est_bits & (1<<i)) { 1287 struct drm_display_mode *newmode; 1288 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 1289 if (newmode) { 1290 drm_mode_probed_add(connector, newmode); 1291 modes++; 1292 } 1293 } 1294 } 1295 1296 if (version_greater(edid, 1, 0)) 1297 drm_for_each_detailed_block((u8 *)edid, 1298 do_established_modes, &closure); 1299 1300 return modes + closure.modes; 1301 } 1302 1303 static void 1304 do_standard_modes(struct detailed_timing *timing, void *c) 1305 { 1306 struct detailed_mode_closure *closure = c; 1307 struct detailed_non_pixel *data = &timing->data.other_data; 1308 struct drm_connector *connector = closure->connector; 1309 struct edid *edid = closure->edid; 1310 1311 if (data->type == EDID_DETAIL_STD_MODES) { 1312 int i; 1313 for (i = 0; i < 6; i++) { 1314 struct std_timing *std; 1315 struct drm_display_mode *newmode; 1316 1317 std = &data->data.timings[i]; 1318 newmode = drm_mode_std(connector, edid, std, 1319 edid->revision); 1320 if (newmode) { 1321 drm_mode_probed_add(connector, newmode); 1322 closure->modes++; 1323 } 1324 } 1325 } 1326 } 1327 1328 /** 1329 * add_standard_modes - get std. modes from EDID and add them 1330 * @edid: EDID block to scan 1331 * 1332 * Standard modes can be calculated using the appropriate standard (DMT, 1333 * GTF or CVT. Grab them from @edid and add them to the list. 1334 */ 1335 static int 1336 add_standard_modes(struct drm_connector *connector, struct edid *edid) 1337 { 1338 int i, modes = 0; 1339 struct detailed_mode_closure closure = { 1340 connector, edid, 0, 0, 0 1341 }; 1342 1343 for (i = 0; i < EDID_STD_TIMINGS; i++) { 1344 struct drm_display_mode *newmode; 1345 1346 newmode = drm_mode_std(connector, edid, 1347 &edid->standard_timings[i], 1348 edid->revision); 1349 if (newmode) { 1350 drm_mode_probed_add(connector, newmode); 1351 modes++; 1352 } 1353 } 1354 1355 if (version_greater(edid, 1, 0)) 1356 drm_for_each_detailed_block((u8 *)edid, do_standard_modes, 1357 &closure); 1358 1359 /* XXX should also look for standard codes in VTB blocks */ 1360 1361 return modes + closure.modes; 1362 } 1363 1364 static int drm_cvt_modes(struct drm_connector *connector, 1365 struct detailed_timing *timing) 1366 { 1367 int i, j, modes = 0; 1368 struct drm_display_mode *newmode; 1369 struct drm_device *dev = connector->dev; 1370 struct cvt_timing *cvt; 1371 const int rates[] = { 60, 85, 75, 60, 50 }; 1372 const u8 empty[3] = { 0, 0, 0 }; 1373 1374 for (i = 0; i < 4; i++) { 1375 int uninitialized_var(width), height; 1376 cvt = &(timing->data.other_data.data.cvt[i]); 1377 1378 if (!memcmp(cvt->code, empty, 3)) 1379 continue; 1380 1381 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; 1382 switch (cvt->code[1] & 0x0c) { 1383 case 0x00: 1384 width = height * 4 / 3; 1385 break; 1386 case 0x04: 1387 width = height * 16 / 9; 1388 break; 1389 case 0x08: 1390 width = height * 16 / 10; 1391 break; 1392 case 0x0c: 1393 width = height * 15 / 9; 1394 break; 1395 } 1396 1397 for (j = 1; j < 5; j++) { 1398 if (cvt->code[2] & (1 << j)) { 1399 newmode = drm_cvt_mode(dev, width, height, 1400 rates[j], j == 0, 1401 false, false); 1402 if (newmode) { 1403 drm_mode_probed_add(connector, newmode); 1404 modes++; 1405 } 1406 } 1407 } 1408 } 1409 1410 return modes; 1411 } 1412 1413 static void 1414 do_cvt_mode(struct detailed_timing *timing, void *c) 1415 { 1416 struct detailed_mode_closure *closure = c; 1417 struct detailed_non_pixel *data = &timing->data.other_data; 1418 1419 if (data->type == EDID_DETAIL_CVT_3BYTE) 1420 closure->modes += drm_cvt_modes(closure->connector, timing); 1421 } 1422 1423 static int 1424 add_cvt_modes(struct drm_connector *connector, struct edid *edid) 1425 { 1426 struct detailed_mode_closure closure = { 1427 connector, edid, 0, 0, 0 1428 }; 1429 1430 if (version_greater(edid, 1, 2)) 1431 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); 1432 1433 /* XXX should also look for CVT codes in VTB blocks */ 1434 1435 return closure.modes; 1436 } 1437 1438 static void 1439 do_detailed_mode(struct detailed_timing *timing, void *c) 1440 { 1441 struct detailed_mode_closure *closure = c; 1442 struct drm_display_mode *newmode; 1443 1444 if (timing->pixel_clock) { 1445 newmode = drm_mode_detailed(closure->connector->dev, 1446 closure->edid, timing, 1447 closure->quirks); 1448 if (!newmode) 1449 return; 1450 1451 if (closure->preferred) 1452 newmode->type |= DRM_MODE_TYPE_PREFERRED; 1453 1454 drm_mode_probed_add(closure->connector, newmode); 1455 closure->modes++; 1456 closure->preferred = 0; 1457 } 1458 } 1459 1460 /* 1461 * add_detailed_modes - Add modes from detailed timings 1462 * @connector: attached connector 1463 * @edid: EDID block to scan 1464 * @quirks: quirks to apply 1465 */ 1466 static int 1467 add_detailed_modes(struct drm_connector *connector, struct edid *edid, 1468 u32 quirks) 1469 { 1470 struct detailed_mode_closure closure = { 1471 connector, 1472 edid, 1473 1, 1474 quirks, 1475 0 1476 }; 1477 1478 if (closure.preferred && !version_greater(edid, 1, 3)) 1479 closure.preferred = 1480 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); 1481 1482 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); 1483 1484 return closure.modes; 1485 } 1486 1487 #define HDMI_IDENTIFIER 0x000C03 1488 #define AUDIO_BLOCK 0x01 1489 #define VIDEO_BLOCK 0x02 1490 #define VENDOR_BLOCK 0x03 1491 #define SPEAKER_BLOCK 0x04 1492 #define EDID_BASIC_AUDIO (1 << 6) 1493 #define EDID_CEA_YCRCB444 (1 << 5) 1494 #define EDID_CEA_YCRCB422 (1 << 4) 1495 1496 /** 1497 * Search EDID for CEA extension block. 1498 */ 1499 u8 *drm_find_cea_extension(struct edid *edid) 1500 { 1501 u8 *edid_ext = NULL; 1502 int i; 1503 1504 /* No EDID or EDID extensions */ 1505 if (edid == NULL || edid->extensions == 0) 1506 return NULL; 1507 1508 /* Find CEA extension */ 1509 for (i = 0; i < edid->extensions; i++) { 1510 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); 1511 if (edid_ext[0] == CEA_EXT) 1512 break; 1513 } 1514 1515 if (i == edid->extensions) 1516 return NULL; 1517 1518 return edid_ext; 1519 } 1520 EXPORT_SYMBOL(drm_find_cea_extension); 1521 1522 /* 1523 * Looks for a CEA mode matching given drm_display_mode. 1524 * Returns its CEA Video ID code, or 0 if not found. 1525 */ 1526 u8 drm_match_cea_mode(struct drm_display_mode *to_match) 1527 { 1528 const struct drm_display_mode *cea_mode; 1529 u8 mode; 1530 1531 for (mode = 0; mode < drm_num_cea_modes; mode++) { 1532 cea_mode = &edid_cea_modes[mode]; 1533 1534 if (drm_mode_equal(to_match, cea_mode)) 1535 return mode + 1; 1536 } 1537 return 0; 1538 } 1539 EXPORT_SYMBOL(drm_match_cea_mode); 1540 1541 1542 static int 1543 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len) 1544 { 1545 struct drm_device *dev = connector->dev; 1546 u8 * mode, cea_mode; 1547 int modes = 0; 1548 1549 for (mode = db; mode < db + len; mode++) { 1550 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */ 1551 if (cea_mode < drm_num_cea_modes) { 1552 struct drm_display_mode *newmode; 1553 newmode = drm_mode_duplicate(dev, 1554 &edid_cea_modes[cea_mode]); 1555 if (newmode) { 1556 drm_mode_probed_add(connector, newmode); 1557 modes++; 1558 } 1559 } 1560 } 1561 1562 return modes; 1563 } 1564 1565 static int 1566 cea_db_payload_len(const u8 *db) 1567 { 1568 return db[0] & 0x1f; 1569 } 1570 1571 static int 1572 cea_db_tag(const u8 *db) 1573 { 1574 return db[0] >> 5; 1575 } 1576 1577 static int 1578 cea_revision(const u8 *cea) 1579 { 1580 return cea[1]; 1581 } 1582 1583 static int 1584 cea_db_offsets(const u8 *cea, int *start, int *end) 1585 { 1586 /* Data block offset in CEA extension block */ 1587 *start = 4; 1588 *end = cea[2]; 1589 if (*end == 0) 1590 *end = 127; 1591 if (*end < 4 || *end > 127) 1592 return -ERANGE; 1593 return 0; 1594 } 1595 1596 #define for_each_cea_db(cea, i, start, end) \ 1597 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1) 1598 1599 static int 1600 add_cea_modes(struct drm_connector *connector, struct edid *edid) 1601 { 1602 u8 * cea = drm_find_cea_extension(edid); 1603 u8 * db, dbl; 1604 int modes = 0; 1605 1606 if (cea && cea_revision(cea) >= 3) { 1607 int i, start, end; 1608 1609 if (cea_db_offsets(cea, &start, &end)) 1610 return 0; 1611 1612 for_each_cea_db(cea, i, start, end) { 1613 db = &cea[i]; 1614 dbl = cea_db_payload_len(db); 1615 1616 if (cea_db_tag(db) == VIDEO_BLOCK) 1617 modes += do_cea_modes (connector, db+1, dbl); 1618 } 1619 } 1620 1621 return modes; 1622 } 1623 1624 static void 1625 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db) 1626 { 1627 u8 len = cea_db_payload_len(db); 1628 1629 if (len >= 6) { 1630 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */ 1631 connector->dvi_dual = db[6] & 1; 1632 } 1633 if (len >= 7) 1634 connector->max_tmds_clock = db[7] * 5; 1635 if (len >= 8) { 1636 connector->latency_present[0] = db[8] >> 7; 1637 connector->latency_present[1] = (db[8] >> 6) & 1; 1638 } 1639 if (len >= 9) 1640 connector->video_latency[0] = db[9]; 1641 if (len >= 10) 1642 connector->audio_latency[0] = db[10]; 1643 if (len >= 11) 1644 connector->video_latency[1] = db[11]; 1645 if (len >= 12) 1646 connector->audio_latency[1] = db[12]; 1647 1648 DRM_DEBUG_KMS("HDMI: DVI dual %d, " 1649 "max TMDS clock %d, " 1650 "latency present %d %d, " 1651 "video latency %d %d, " 1652 "audio latency %d %d\n", 1653 connector->dvi_dual, 1654 connector->max_tmds_clock, 1655 (int) connector->latency_present[0], 1656 (int) connector->latency_present[1], 1657 connector->video_latency[0], 1658 connector->video_latency[1], 1659 connector->audio_latency[0], 1660 connector->audio_latency[1]); 1661 } 1662 1663 static void 1664 monitor_name(struct detailed_timing *t, void *data) 1665 { 1666 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME) 1667 *(u8 **)data = t->data.other_data.data.str.str; 1668 } 1669 1670 static bool cea_db_is_hdmi_vsdb(const u8 *db) 1671 { 1672 int hdmi_id; 1673 1674 if (cea_db_tag(db) != VENDOR_BLOCK) 1675 return false; 1676 1677 if (cea_db_payload_len(db) < 5) 1678 return false; 1679 1680 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16); 1681 1682 return hdmi_id == HDMI_IDENTIFIER; 1683 } 1684 1685 /** 1686 * drm_edid_to_eld - build ELD from EDID 1687 * @connector: connector corresponding to the HDMI/DP sink 1688 * @edid: EDID to parse 1689 * 1690 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver. 1691 * Some ELD fields are left to the graphics driver caller: 1692 * - Conn_Type 1693 * - HDCP 1694 * - Port_ID 1695 */ 1696 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid) 1697 { 1698 uint8_t *eld = connector->eld; 1699 u8 *cea; 1700 u8 *name; 1701 u8 *db; 1702 int sad_count = 0; 1703 int mnl; 1704 int dbl; 1705 1706 memset(eld, 0, sizeof(connector->eld)); 1707 1708 cea = drm_find_cea_extension(edid); 1709 if (!cea) { 1710 DRM_DEBUG_KMS("ELD: no CEA Extension found\n"); 1711 return; 1712 } 1713 1714 name = NULL; 1715 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name); 1716 for (mnl = 0; name && mnl < 13; mnl++) { 1717 if (name[mnl] == 0x0a) 1718 break; 1719 eld[20 + mnl] = name[mnl]; 1720 } 1721 eld[4] = (cea[1] << 5) | mnl; 1722 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20); 1723 1724 eld[0] = 2 << 3; /* ELD version: 2 */ 1725 1726 eld[16] = edid->mfg_id[0]; 1727 eld[17] = edid->mfg_id[1]; 1728 eld[18] = edid->prod_code[0]; 1729 eld[19] = edid->prod_code[1]; 1730 1731 if (cea_revision(cea) >= 3) { 1732 int i, start, end; 1733 1734 if (cea_db_offsets(cea, &start, &end)) { 1735 start = 0; 1736 end = 0; 1737 } 1738 1739 for_each_cea_db(cea, i, start, end) { 1740 db = &cea[i]; 1741 dbl = cea_db_payload_len(db); 1742 1743 switch (cea_db_tag(db)) { 1744 case AUDIO_BLOCK: 1745 /* Audio Data Block, contains SADs */ 1746 sad_count = dbl / 3; 1747 if (dbl >= 1) 1748 memcpy(eld + 20 + mnl, &db[1], dbl); 1749 break; 1750 case SPEAKER_BLOCK: 1751 /* Speaker Allocation Data Block */ 1752 if (dbl >= 1) 1753 eld[7] = db[1]; 1754 break; 1755 case VENDOR_BLOCK: 1756 /* HDMI Vendor-Specific Data Block */ 1757 if (cea_db_is_hdmi_vsdb(db)) 1758 parse_hdmi_vsdb(connector, db); 1759 break; 1760 default: 1761 break; 1762 } 1763 } 1764 } 1765 eld[5] |= sad_count << 4; 1766 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4; 1767 1768 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count); 1769 } 1770 EXPORT_SYMBOL(drm_edid_to_eld); 1771 1772 /** 1773 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond 1774 * @connector: connector associated with the HDMI/DP sink 1775 * @mode: the display mode 1776 */ 1777 int drm_av_sync_delay(struct drm_connector *connector, 1778 struct drm_display_mode *mode) 1779 { 1780 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1781 int a, v; 1782 1783 if (!connector->latency_present[0]) 1784 return 0; 1785 if (!connector->latency_present[1]) 1786 i = 0; 1787 1788 a = connector->audio_latency[i]; 1789 v = connector->video_latency[i]; 1790 1791 /* 1792 * HDMI/DP sink doesn't support audio or video? 1793 */ 1794 if (a == 255 || v == 255) 1795 return 0; 1796 1797 /* 1798 * Convert raw EDID values to millisecond. 1799 * Treat unknown latency as 0ms. 1800 */ 1801 if (a) 1802 a = min(2 * (a - 1), 500); 1803 if (v) 1804 v = min(2 * (v - 1), 500); 1805 1806 return max(v - a, 0); 1807 } 1808 EXPORT_SYMBOL(drm_av_sync_delay); 1809 1810 /** 1811 * drm_select_eld - select one ELD from multiple HDMI/DP sinks 1812 * @encoder: the encoder just changed display mode 1813 * @mode: the adjusted display mode 1814 * 1815 * It's possible for one encoder to be associated with multiple HDMI/DP sinks. 1816 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD. 1817 */ 1818 struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 1819 struct drm_display_mode *mode) 1820 { 1821 struct drm_connector *connector; 1822 struct drm_device *dev = encoder->dev; 1823 1824 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 1825 if (connector->encoder == encoder && connector->eld[0]) 1826 return connector; 1827 1828 return NULL; 1829 } 1830 EXPORT_SYMBOL(drm_select_eld); 1831 1832 /** 1833 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 1834 * @edid: monitor EDID information 1835 * 1836 * Parse the CEA extension according to CEA-861-B. 1837 * Return true if HDMI, false if not or unknown. 1838 */ 1839 bool drm_detect_hdmi_monitor(struct edid *edid) 1840 { 1841 u8 *edid_ext; 1842 int i; 1843 int start_offset, end_offset; 1844 1845 edid_ext = drm_find_cea_extension(edid); 1846 if (!edid_ext) 1847 return false; 1848 1849 if (cea_db_offsets(edid_ext, &start_offset, &end_offset)) 1850 return false; 1851 1852 /* 1853 * Because HDMI identifier is in Vendor Specific Block, 1854 * search it from all data blocks of CEA extension. 1855 */ 1856 for_each_cea_db(edid_ext, i, start_offset, end_offset) { 1857 if (cea_db_is_hdmi_vsdb(&edid_ext[i])) 1858 return true; 1859 } 1860 1861 return false; 1862 } 1863 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 1864 1865 /** 1866 * drm_detect_monitor_audio - check monitor audio capability 1867 * 1868 * Monitor should have CEA extension block. 1869 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic 1870 * audio' only. If there is any audio extension block and supported 1871 * audio format, assume at least 'basic audio' support, even if 'basic 1872 * audio' is not defined in EDID. 1873 * 1874 */ 1875 bool drm_detect_monitor_audio(struct edid *edid) 1876 { 1877 u8 *edid_ext; 1878 int i, j; 1879 bool has_audio = false; 1880 int start_offset, end_offset; 1881 1882 edid_ext = drm_find_cea_extension(edid); 1883 if (!edid_ext) 1884 goto end; 1885 1886 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); 1887 1888 if (has_audio) { 1889 DRM_DEBUG_KMS("Monitor has basic audio support\n"); 1890 goto end; 1891 } 1892 1893 if (cea_db_offsets(edid_ext, &start_offset, &end_offset)) 1894 goto end; 1895 1896 for_each_cea_db(edid_ext, i, start_offset, end_offset) { 1897 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) { 1898 has_audio = true; 1899 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3) 1900 DRM_DEBUG_KMS("CEA audio format %d\n", 1901 (edid_ext[i + j] >> 3) & 0xf); 1902 goto end; 1903 } 1904 } 1905 end: 1906 return has_audio; 1907 } 1908 EXPORT_SYMBOL(drm_detect_monitor_audio); 1909 1910 /** 1911 * drm_add_display_info - pull display info out if present 1912 * @edid: EDID data 1913 * @info: display info (attached to connector) 1914 * 1915 * Grab any available display info and stuff it into the drm_display_info 1916 * structure that's part of the connector. Useful for tracking bpp and 1917 * color spaces. 1918 */ 1919 static void drm_add_display_info(struct edid *edid, 1920 struct drm_display_info *info) 1921 { 1922 u8 *edid_ext; 1923 1924 info->width_mm = edid->width_cm * 10; 1925 info->height_mm = edid->height_cm * 10; 1926 1927 /* driver figures it out in this case */ 1928 info->bpc = 0; 1929 info->color_formats = 0; 1930 1931 if (edid->revision < 3) 1932 return; 1933 1934 if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) 1935 return; 1936 1937 /* Get data from CEA blocks if present */ 1938 edid_ext = drm_find_cea_extension(edid); 1939 if (edid_ext) { 1940 info->cea_rev = edid_ext[1]; 1941 1942 /* The existence of a CEA block should imply RGB support */ 1943 info->color_formats = DRM_COLOR_FORMAT_RGB444; 1944 if (edid_ext[3] & EDID_CEA_YCRCB444) 1945 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1946 if (edid_ext[3] & EDID_CEA_YCRCB422) 1947 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1948 } 1949 1950 /* Only defined for 1.4 with digital displays */ 1951 if (edid->revision < 4) 1952 return; 1953 1954 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { 1955 case DRM_EDID_DIGITAL_DEPTH_6: 1956 info->bpc = 6; 1957 break; 1958 case DRM_EDID_DIGITAL_DEPTH_8: 1959 info->bpc = 8; 1960 break; 1961 case DRM_EDID_DIGITAL_DEPTH_10: 1962 info->bpc = 10; 1963 break; 1964 case DRM_EDID_DIGITAL_DEPTH_12: 1965 info->bpc = 12; 1966 break; 1967 case DRM_EDID_DIGITAL_DEPTH_14: 1968 info->bpc = 14; 1969 break; 1970 case DRM_EDID_DIGITAL_DEPTH_16: 1971 info->bpc = 16; 1972 break; 1973 case DRM_EDID_DIGITAL_DEPTH_UNDEF: 1974 default: 1975 info->bpc = 0; 1976 break; 1977 } 1978 1979 info->color_formats |= DRM_COLOR_FORMAT_RGB444; 1980 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444) 1981 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; 1982 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) 1983 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; 1984 } 1985 1986 /** 1987 * drm_add_edid_modes - add modes from EDID data, if available 1988 * @connector: connector we're probing 1989 * @edid: edid data 1990 * 1991 * Add the specified modes to the connector's mode list. 1992 * 1993 * Return number of modes added or 0 if we couldn't find any. 1994 */ 1995 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 1996 { 1997 int num_modes = 0; 1998 u32 quirks; 1999 2000 if (edid == NULL) { 2001 return 0; 2002 } 2003 if (!drm_edid_is_valid(edid)) { 2004 dev_warn(connector->dev->dev, "%s: EDID invalid.\n", 2005 drm_get_connector_name(connector)); 2006 return 0; 2007 } 2008 2009 quirks = edid_get_quirks(edid); 2010 2011 /* 2012 * EDID spec says modes should be preferred in this order: 2013 * - preferred detailed mode 2014 * - other detailed modes from base block 2015 * - detailed modes from extension blocks 2016 * - CVT 3-byte code modes 2017 * - standard timing codes 2018 * - established timing codes 2019 * - modes inferred from GTF or CVT range information 2020 * 2021 * We get this pretty much right. 2022 * 2023 * XXX order for additional mode types in extension blocks? 2024 */ 2025 num_modes += add_detailed_modes(connector, edid, quirks); 2026 num_modes += add_cvt_modes(connector, edid); 2027 num_modes += add_standard_modes(connector, edid); 2028 num_modes += add_established_modes(connector, edid); 2029 num_modes += add_inferred_modes(connector, edid); 2030 num_modes += add_cea_modes(connector, edid); 2031 2032 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 2033 edid_fixup_preferred(connector, quirks); 2034 2035 drm_add_display_info(edid, &connector->display_info); 2036 2037 return num_modes; 2038 } 2039 EXPORT_SYMBOL(drm_add_edid_modes); 2040 2041 /** 2042 * drm_add_modes_noedid - add modes for the connectors without EDID 2043 * @connector: connector we're probing 2044 * @hdisplay: the horizontal display limit 2045 * @vdisplay: the vertical display limit 2046 * 2047 * Add the specified modes to the connector's mode list. Only when the 2048 * hdisplay/vdisplay is not beyond the given limit, it will be added. 2049 * 2050 * Return number of modes added or 0 if we couldn't find any. 2051 */ 2052 int drm_add_modes_noedid(struct drm_connector *connector, 2053 int hdisplay, int vdisplay) 2054 { 2055 int i, count, num_modes = 0; 2056 struct drm_display_mode *mode; 2057 struct drm_device *dev = connector->dev; 2058 2059 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); 2060 if (hdisplay < 0) 2061 hdisplay = 0; 2062 if (vdisplay < 0) 2063 vdisplay = 0; 2064 2065 for (i = 0; i < count; i++) { 2066 const struct drm_display_mode *ptr = &drm_dmt_modes[i]; 2067 if (hdisplay && vdisplay) { 2068 /* 2069 * Only when two are valid, they will be used to check 2070 * whether the mode should be added to the mode list of 2071 * the connector. 2072 */ 2073 if (ptr->hdisplay > hdisplay || 2074 ptr->vdisplay > vdisplay) 2075 continue; 2076 } 2077 if (drm_mode_vrefresh(ptr) > 61) 2078 continue; 2079 mode = drm_mode_duplicate(dev, ptr); 2080 if (mode) { 2081 drm_mode_probed_add(connector, mode); 2082 num_modes++; 2083 } 2084 } 2085 return num_modes; 2086 } 2087 EXPORT_SYMBOL(drm_add_modes_noedid); 2088 2089 /** 2090 * drm_mode_cea_vic - return the CEA-861 VIC of a given mode 2091 * @mode: mode 2092 * 2093 * RETURNS: 2094 * The VIC number, 0 in case it's not a CEA-861 mode. 2095 */ 2096 uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode) 2097 { 2098 uint8_t i; 2099 2100 for (i = 0; i < drm_num_cea_modes; i++) 2101 if (drm_mode_equal(mode, &edid_cea_modes[i])) 2102 return i + 1; 2103 2104 return 0; 2105 } 2106 EXPORT_SYMBOL(drm_mode_cea_vic); 2107
Indexes created Thu Oct 16 14:10:15 GMT 2025