edid.c revision 278798
1/* $NetBSD: edid.c,v 1.12 2013/02/08 16:35:10 skrll Exp $ */ 2/* $FreeBSD: head/sys/dev/videomode/edid.c 278798 2015-02-15 11:37:40Z hselasky $ */ 3 4/*- 5 * Copyright (c) 2006 Itronix Inc. 6 * All rights reserved. 7 * 8 * Written by Garrett D'Amore for Itronix Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of Itronix Inc. may not be used to endorse 19 * or promote products derived from this software without specific 20 * prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS 23 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 26 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 28 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: head/sys/dev/videomode/edid.c 278798 2015-02-15 11:37:40Z hselasky $"); 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/malloc.h> 42#include <sys/libkern.h> 43#include <dev/videomode/videomode.h> 44#include <dev/videomode/ediddevs.h> 45#include <dev/videomode/edidreg.h> 46#include <dev/videomode/edidvar.h> 47#include <dev/videomode/vesagtf.h> 48 49#define EDIDVERBOSE 1 50#define DIVIDE(x,y) (((x) + ((y) / 2)) / (y)) 51 52/* These are reversed established timing order */ 53static const char *_edid_modes[] = { 54 "1280x1024x75", 55 "1024x768x75", 56 "1024x768x70", 57 "1024x768x60", 58 "1024x768x87i", 59 "832x624x74", /* rounding error, 74.55 Hz aka "832x624x75" */ 60 "800x600x75", 61 "800x600x72", 62 "800x600x60", 63 "800x600x56", 64 "640x480x75", 65 "640x480x72", 66 "640x480x67", 67 "640x480x60", 68 "720x400x87", /* rounding error, 87.85 Hz aka "720x400x88" */ 69 "720x400x70", 70}; 71 72#ifdef EDIDVERBOSE 73struct edid_vendor { 74 const char *vendor; 75 const char *name; 76}; 77 78struct edid_product { 79 const char *vendor; 80 uint16_t product; 81 const char *name; 82}; 83 84#include <dev/videomode/ediddevs_data.h> 85#endif /* EDIDVERBOSE */ 86 87static const char * 88edid_findvendor(const char *vendor) 89{ 90#ifdef EDIDVERBOSE 91 int n; 92 93 for (n = 0; n < edid_nvendors; n++) 94 if (memcmp(edid_vendors[n].vendor, vendor, 3) == 0) 95 return edid_vendors[n].name; 96#endif 97 return NULL; 98} 99 100static const char * 101edid_findproduct(const char *vendor, uint16_t product) 102{ 103#ifdef EDIDVERBOSE 104 int n; 105 106 for (n = 0; n < edid_nproducts; n++) 107 if (edid_products[n].product == product && 108 memcmp(edid_products[n].vendor, vendor, 3) == 0) 109 return edid_products[n].name; 110#endif /* EDIDVERBOSE */ 111 return NULL; 112 113} 114 115static void 116edid_strchomp(char *ptr) 117{ 118 for (;;) { 119 switch (*ptr) { 120 case '\0': 121 return; 122 case '\r': 123 case '\n': 124 *ptr = '\0'; 125 return; 126 } 127 ptr++; 128 } 129} 130 131int 132edid_is_valid(uint8_t *d) 133{ 134 int sum = 0, i; 135 uint8_t sig[8] = EDID_SIGNATURE; 136 137 if (memcmp(d, sig, 8) != 0) 138 return EINVAL; 139 140 for (i = 0; i < 128; i++) 141 sum += d[i]; 142 if ((sum & 0xff) != 0) 143 return EINVAL; 144 145 return 0; 146} 147 148void 149edid_print(struct edid_info *edid) 150{ 151 int i; 152 153 if (edid == NULL) 154 return; 155 printf("Vendor: [%s] %s\n", edid->edid_vendor, edid->edid_vendorname); 156 printf("Product: [%04X] %s\n", edid->edid_product, 157 edid->edid_productname); 158 printf("Serial number: %s\n", edid->edid_serial); 159 printf("Manufactured %d Week %d\n", 160 edid->edid_year, edid->edid_week); 161 printf("EDID Version %d.%d\n", edid->edid_version, 162 edid->edid_revision); 163 printf("EDID Comment: %s\n", edid->edid_comment); 164 165 printf("Video Input: %x\n", edid->edid_video_input); 166 if (edid->edid_video_input & EDID_VIDEO_INPUT_DIGITAL) { 167 printf("\tDigital"); 168 if (edid->edid_video_input & EDID_VIDEO_INPUT_DFP1_COMPAT) 169 printf(" (DFP 1.x compatible)"); 170 printf("\n"); 171 } else { 172 printf("\tAnalog\n"); 173 switch (EDID_VIDEO_INPUT_LEVEL(edid->edid_video_input)) { 174 case 0: 175 printf("\t-0.7, 0.3V\n"); 176 break; 177 case 1: 178 printf("\t-0.714, 0.286V\n"); 179 break; 180 case 2: 181 printf("\t-1.0, 0.4V\n"); 182 break; 183 case 3: 184 printf("\t-0.7, 0.0V\n"); 185 break; 186 } 187 if (edid->edid_video_input & EDID_VIDEO_INPUT_BLANK_TO_BLACK) 188 printf("\tBlank-to-black setup\n"); 189 if (edid->edid_video_input & EDID_VIDEO_INPUT_SEPARATE_SYNCS) 190 printf("\tSeperate syncs\n"); 191 if (edid->edid_video_input & EDID_VIDEO_INPUT_COMPOSITE_SYNC) 192 printf("\tComposite sync\n"); 193 if (edid->edid_video_input & EDID_VIDEO_INPUT_SYNC_ON_GRN) 194 printf("\tSync on green\n"); 195 if (edid->edid_video_input & EDID_VIDEO_INPUT_SERRATION) 196 printf("\tSerration vsync\n"); 197 } 198 199 printf("Gamma: %d.%02d\n", 200 edid->edid_gamma / 100, edid->edid_gamma % 100); 201 202 printf("Max Size: %d cm x %d cm\n", 203 edid->edid_max_hsize, edid->edid_max_vsize); 204 205 printf("Features: %x\n", edid->edid_features); 206 if (edid->edid_features & EDID_FEATURES_STANDBY) 207 printf("\tDPMS standby\n"); 208 if (edid->edid_features & EDID_FEATURES_SUSPEND) 209 printf("\tDPMS suspend\n"); 210 if (edid->edid_features & EDID_FEATURES_ACTIVE_OFF) 211 printf("\tDPMS active-off\n"); 212 switch (EDID_FEATURES_DISP_TYPE(edid->edid_features)) { 213 case EDID_FEATURES_DISP_TYPE_MONO: 214 printf("\tMonochrome\n"); 215 break; 216 case EDID_FEATURES_DISP_TYPE_RGB: 217 printf("\tRGB\n"); 218 break; 219 case EDID_FEATURES_DISP_TYPE_NON_RGB: 220 printf("\tMulticolor\n"); 221 break; 222 case EDID_FEATURES_DISP_TYPE_UNDEFINED: 223 printf("\tUndefined monitor type\n"); 224 break; 225 } 226 if (edid->edid_features & EDID_FEATURES_STD_COLOR) 227 printf("\tStandard color space\n"); 228 if (edid->edid_features & EDID_FEATURES_PREFERRED_TIMING) 229 printf("\tPreferred timing\n"); 230 if (edid->edid_features & EDID_FEATURES_DEFAULT_GTF) 231 printf("\tDefault GTF supported\n"); 232 233 printf("Chroma Info:\n"); 234 printf("\tRed X: 0.%03d\n", edid->edid_chroma.ec_redx); 235 printf("\tRed Y: 0.%03d\n", edid->edid_chroma.ec_redy); 236 printf("\tGrn X: 0.%03d\n", edid->edid_chroma.ec_greenx); 237 printf("\tGrn Y: 0.%03d\n", edid->edid_chroma.ec_greeny); 238 printf("\tBlu X: 0.%03d\n", edid->edid_chroma.ec_bluex); 239 printf("\tBlu Y: 0.%03d\n", edid->edid_chroma.ec_bluey); 240 printf("\tWht X: 0.%03d\n", edid->edid_chroma.ec_whitex); 241 printf("\tWht Y: 0.%03d\n", edid->edid_chroma.ec_whitey); 242 243 if (edid->edid_have_range) { 244 printf("Range:\n"); 245 printf("\tHorizontal: %d - %d kHz\n", 246 edid->edid_range.er_min_hfreq, 247 edid->edid_range.er_max_hfreq); 248 printf("\tVertical: %d - %d Hz\n", 249 edid->edid_range.er_min_vfreq, 250 edid->edid_range.er_max_vfreq); 251 printf("\tMax Dot Clock: %d MHz\n", 252 edid->edid_range.er_max_clock); 253 if (edid->edid_range.er_have_gtf2) { 254 printf("\tGTF2 hfreq: %d\n", 255 edid->edid_range.er_gtf2_hfreq); 256 printf("\tGTF2 C: %d\n", edid->edid_range.er_gtf2_c); 257 printf("\tGTF2 M: %d\n", edid->edid_range.er_gtf2_m); 258 printf("\tGTF2 J: %d\n", edid->edid_range.er_gtf2_j); 259 printf("\tGTF2 K: %d\n", edid->edid_range.er_gtf2_k); 260 } 261 } 262 printf("Video modes:\n"); 263 for (i = 0; i < edid->edid_nmodes; i++) { 264 printf("\t%dx%d @ %dHz", 265 edid->edid_modes[i].hdisplay, 266 edid->edid_modes[i].vdisplay, 267 DIVIDE(DIVIDE(edid->edid_modes[i].dot_clock * 1000, 268 edid->edid_modes[i].htotal), edid->edid_modes[i].vtotal)); 269 printf(" (%d %d %d %d %d %d %d", 270 edid->edid_modes[i].dot_clock, 271 edid->edid_modes[i].hsync_start, 272 edid->edid_modes[i].hsync_end, 273 edid->edid_modes[i].htotal, 274 edid->edid_modes[i].vsync_start, 275 edid->edid_modes[i].vsync_end, 276 edid->edid_modes[i].vtotal); 277 printf(" %s%sH %s%sV)\n", 278 edid->edid_modes[i].flags & VID_PHSYNC ? "+" : "", 279 edid->edid_modes[i].flags & VID_NHSYNC ? "-" : "", 280 edid->edid_modes[i].flags & VID_PVSYNC ? "+" : "", 281 edid->edid_modes[i].flags & VID_NVSYNC ? "-" : ""); 282 } 283 if (edid->edid_preferred_mode) 284 printf("Preferred mode: %dx%d @ %dHz\n", 285 edid->edid_preferred_mode->hdisplay, 286 edid->edid_preferred_mode->vdisplay, 287 DIVIDE(DIVIDE(edid->edid_preferred_mode->dot_clock * 1000, 288 edid->edid_preferred_mode->htotal), 289 edid->edid_preferred_mode->vtotal)); 290 291 printf("Number of extension blocks: %d\n", edid->edid_ext_block_count); 292} 293 294static const struct videomode * 295edid_mode_lookup_list(const char *name) 296{ 297 int i; 298 299 for (i = 0; i < videomode_count; i++) 300 if (strcmp(name, videomode_list[i].name) == 0) 301 return &videomode_list[i]; 302 return NULL; 303} 304 305static struct videomode * 306edid_search_mode(struct edid_info *edid, const struct videomode *mode) 307{ 308 int refresh, i; 309 310 refresh = DIVIDE(DIVIDE(mode->dot_clock * 1000, 311 mode->htotal), mode->vtotal); 312 for (i = 0; i < edid->edid_nmodes; i++) { 313 if (mode->hdisplay == edid->edid_modes[i].hdisplay && 314 mode->vdisplay == edid->edid_modes[i].vdisplay && 315 refresh == DIVIDE(DIVIDE( 316 edid->edid_modes[i].dot_clock * 1000, 317 edid->edid_modes[i].htotal), edid->edid_modes[i].vtotal)) { 318 return &edid->edid_modes[i]; 319 } 320 } 321 return NULL; 322} 323 324static int 325edid_std_timing(uint8_t *data, struct videomode *vmp) 326{ 327 unsigned x, y, f; 328 const struct videomode *lookup; 329 char name[80]; 330 331 if ((data[0] == 1 && data[1] == 1) || 332 (data[0] == 0 && data[1] == 0) || 333 (data[0] == 0x20 && data[1] == 0x20)) 334 return 0; 335 336 x = EDID_STD_TIMING_HRES(data); 337 switch (EDID_STD_TIMING_RATIO(data)) { 338 case EDID_STD_TIMING_RATIO_16_10: 339 y = x * 10 / 16; 340 break; 341 case EDID_STD_TIMING_RATIO_4_3: 342 y = x * 3 / 4; 343 break; 344 case EDID_STD_TIMING_RATIO_5_4: 345 y = x * 4 / 5; 346 break; 347 case EDID_STD_TIMING_RATIO_16_9: 348 default: 349 y = x * 9 / 16; 350 break; 351 } 352 f = EDID_STD_TIMING_VFREQ(data); 353 354 /* first try to lookup the mode as a DMT timing */ 355 snprintf(name, sizeof(name), "%dx%dx%d", x, y, f); 356 if ((lookup = edid_mode_lookup_list(name)) != NULL) { 357 *vmp = *lookup; 358 } else { 359 /* failing that, calculate it using gtf */ 360 /* 361 * Hmm. I'm not using alternate GTF timings, which 362 * could, in theory, be present. 363 */ 364 vesagtf_mode(x, y, f, vmp); 365 } 366 return 1; 367} 368 369static int 370edid_det_timing(uint8_t *data, struct videomode *vmp) 371{ 372 unsigned hactive, hblank, hsyncwid, hsyncoff; 373 unsigned vactive, vblank, vsyncwid, vsyncoff; 374 uint8_t flags; 375 376 flags = EDID_DET_TIMING_FLAGS(data); 377 378 /* we don't support stereo modes (for now) */ 379 if (flags & (EDID_DET_TIMING_FLAG_STEREO | 380 EDID_DET_TIMING_FLAG_STEREO_MODE)) 381 return 0; 382 383 vmp->dot_clock = EDID_DET_TIMING_DOT_CLOCK(data) / 1000; 384 385 hactive = EDID_DET_TIMING_HACTIVE(data); 386 hblank = EDID_DET_TIMING_HBLANK(data); 387 hsyncwid = EDID_DET_TIMING_HSYNC_WIDTH(data); 388 hsyncoff = EDID_DET_TIMING_HSYNC_OFFSET(data); 389 390 vactive = EDID_DET_TIMING_VACTIVE(data); 391 vblank = EDID_DET_TIMING_VBLANK(data); 392 vsyncwid = EDID_DET_TIMING_VSYNC_WIDTH(data); 393 vsyncoff = EDID_DET_TIMING_VSYNC_OFFSET(data); 394 395 /* Borders are contained within the blank areas. */ 396 397 vmp->hdisplay = hactive; 398 vmp->htotal = hactive + hblank; 399 vmp->hsync_start = hactive + hsyncoff; 400 vmp->hsync_end = vmp->hsync_start + hsyncwid; 401 402 vmp->vdisplay = vactive; 403 vmp->vtotal = vactive + vblank; 404 vmp->vsync_start = vactive + vsyncoff; 405 vmp->vsync_end = vmp->vsync_start + vsyncwid; 406 407 vmp->flags = 0; 408 409 if (flags & EDID_DET_TIMING_FLAG_INTERLACE) 410 vmp->flags |= VID_INTERLACE; 411 if (flags & EDID_DET_TIMING_FLAG_HSYNC_POSITIVE) 412 vmp->flags |= VID_PHSYNC; 413 else 414 vmp->flags |= VID_NHSYNC; 415 416 if (flags & EDID_DET_TIMING_FLAG_VSYNC_POSITIVE) 417 vmp->flags |= VID_PVSYNC; 418 else 419 vmp->flags |= VID_NVSYNC; 420 421 return 1; 422} 423 424static void 425edid_block(struct edid_info *edid, uint8_t *data) 426{ 427 int i; 428 struct videomode mode, *exist_mode; 429 430 if (EDID_BLOCK_IS_DET_TIMING(data)) { 431 if (!edid_det_timing(data, &mode)) 432 return; 433 /* Does this mode already exist? */ 434 exist_mode = edid_search_mode(edid, &mode); 435 if (exist_mode != NULL) { 436 *exist_mode = mode; 437 if (edid->edid_preferred_mode == NULL) 438 edid->edid_preferred_mode = exist_mode; 439 } else { 440 edid->edid_modes[edid->edid_nmodes] = mode; 441 if (edid->edid_preferred_mode == NULL) 442 edid->edid_preferred_mode = 443 &edid->edid_modes[edid->edid_nmodes]; 444 edid->edid_nmodes++; 445 } 446 return; 447 } 448 449 switch (EDID_BLOCK_TYPE(data)) { 450 case EDID_DESC_BLOCK_TYPE_SERIAL: 451 memcpy(edid->edid_serial, data + EDID_DESC_ASCII_DATA_OFFSET, 452 EDID_DESC_ASCII_DATA_LEN); 453 edid->edid_serial[sizeof(edid->edid_serial) - 1] = 0; 454 break; 455 456 case EDID_DESC_BLOCK_TYPE_ASCII: 457 memcpy(edid->edid_comment, data + EDID_DESC_ASCII_DATA_OFFSET, 458 EDID_DESC_ASCII_DATA_LEN); 459 edid->edid_comment[sizeof(edid->edid_comment) - 1] = 0; 460 break; 461 462 case EDID_DESC_BLOCK_TYPE_RANGE: 463 edid->edid_have_range = 1; 464 edid->edid_range.er_min_vfreq = EDID_DESC_RANGE_MIN_VFREQ(data); 465 edid->edid_range.er_max_vfreq = EDID_DESC_RANGE_MAX_VFREQ(data); 466 edid->edid_range.er_min_hfreq = EDID_DESC_RANGE_MIN_HFREQ(data); 467 edid->edid_range.er_max_hfreq = EDID_DESC_RANGE_MAX_HFREQ(data); 468 edid->edid_range.er_max_clock = EDID_DESC_RANGE_MAX_CLOCK(data); 469 if (!EDID_DESC_RANGE_HAVE_GTF2(data)) 470 break; 471 edid->edid_range.er_have_gtf2 = 1; 472 edid->edid_range.er_gtf2_hfreq = 473 EDID_DESC_RANGE_GTF2_HFREQ(data); 474 edid->edid_range.er_gtf2_c = EDID_DESC_RANGE_GTF2_C(data); 475 edid->edid_range.er_gtf2_m = EDID_DESC_RANGE_GTF2_M(data); 476 edid->edid_range.er_gtf2_j = EDID_DESC_RANGE_GTF2_J(data); 477 edid->edid_range.er_gtf2_k = EDID_DESC_RANGE_GTF2_K(data); 478 break; 479 480 case EDID_DESC_BLOCK_TYPE_NAME: 481 /* copy the product name into place */ 482 memcpy(edid->edid_productname, 483 data + EDID_DESC_ASCII_DATA_OFFSET, 484 EDID_DESC_ASCII_DATA_LEN); 485 break; 486 487 case EDID_DESC_BLOCK_TYPE_STD_TIMING: 488 data += EDID_DESC_STD_TIMING_START; 489 for (i = 0; i < EDID_DESC_STD_TIMING_COUNT; i++) { 490 if (edid_std_timing(data, &mode)) { 491 /* Does this mode already exist? */ 492 exist_mode = edid_search_mode(edid, &mode); 493 if (exist_mode == NULL) { 494 edid->edid_modes[edid->edid_nmodes] = 495 mode; 496 edid->edid_nmodes++; 497 } 498 } 499 data += 2; 500 } 501 break; 502 503 case EDID_DESC_BLOCK_TYPE_COLOR_POINT: 504 /* XXX: not implemented yet */ 505 break; 506 } 507} 508 509/* 510 * Gets EDID version in BCD, e.g. EDID v1.3 returned as 0x0103 511 */ 512int 513edid_parse(uint8_t *data, struct edid_info *edid) 514{ 515 uint16_t manfid, estmodes; 516 const struct videomode *vmp; 517 int i; 518 const char *name; 519 int max_dotclock = 0; 520 int mhz; 521 522 if (edid_is_valid(data) != 0) 523 return -1; 524 525 /* get product identification */ 526 manfid = EDID_VENDOR_ID(data); 527 edid->edid_vendor[0] = EDID_MANFID_0(manfid); 528 edid->edid_vendor[1] = EDID_MANFID_1(manfid); 529 edid->edid_vendor[2] = EDID_MANFID_2(manfid); 530 edid->edid_vendor[3] = 0; /* null terminate for convenience */ 531 532 edid->edid_product = data[EDID_OFFSET_PRODUCT_ID] + 533 (data[EDID_OFFSET_PRODUCT_ID + 1] << 8); 534 535 name = edid_findvendor(edid->edid_vendor); 536 if (name != NULL) 537 strlcpy(edid->edid_vendorname, name, 538 sizeof(edid->edid_vendorname)); 539 else 540 edid->edid_vendorname[0] = '\0'; 541 542 name = edid_findproduct(edid->edid_vendor, edid->edid_product); 543 if (name != NULL) 544 strlcpy(edid->edid_productname, name, 545 sizeof(edid->edid_productname)); 546 else 547 edid->edid_productname[0] = '\0'; 548 549 snprintf(edid->edid_serial, sizeof(edid->edid_serial), "%08x", 550 EDID_SERIAL_NUMBER(data)); 551 552 edid->edid_week = EDID_WEEK(data); 553 edid->edid_year = EDID_YEAR(data); 554 555 /* get edid revision */ 556 edid->edid_version = EDID_VERSION(data); 557 edid->edid_revision = EDID_REVISION(data); 558 559 edid->edid_video_input = EDID_VIDEO_INPUT(data); 560 edid->edid_max_hsize = EDID_MAX_HSIZE(data); 561 edid->edid_max_vsize = EDID_MAX_VSIZE(data); 562 563 edid->edid_gamma = EDID_GAMMA(data); 564 edid->edid_features = EDID_FEATURES(data); 565 566 edid->edid_chroma.ec_redx = EDID_CHROMA_REDX(data); 567 edid->edid_chroma.ec_redy = EDID_CHROMA_REDX(data); 568 edid->edid_chroma.ec_greenx = EDID_CHROMA_GREENX(data); 569 edid->edid_chroma.ec_greeny = EDID_CHROMA_GREENY(data); 570 edid->edid_chroma.ec_bluex = EDID_CHROMA_BLUEX(data); 571 edid->edid_chroma.ec_bluey = EDID_CHROMA_BLUEY(data); 572 edid->edid_chroma.ec_whitex = EDID_CHROMA_WHITEX(data); 573 edid->edid_chroma.ec_whitey = EDID_CHROMA_WHITEY(data); 574 575 edid->edid_ext_block_count = EDID_EXT_BLOCK_COUNT(data); 576 577 /* lookup established modes */ 578 edid->edid_nmodes = 0; 579 edid->edid_preferred_mode = NULL; 580 estmodes = EDID_EST_TIMING(data); 581 /* Iterate in esztablished timing order */ 582 for (i = 15; i >= 0; i--) { 583 if (estmodes & (1 << i)) { 584 vmp = edid_mode_lookup_list(_edid_modes[i]); 585 if (vmp != NULL) { 586 edid->edid_modes[edid->edid_nmodes] = *vmp; 587 edid->edid_nmodes++; 588 } 589#ifdef DIAGNOSTIC 590 else 591 printf("no data for est. mode %s\n", 592 _edid_modes[i]); 593#endif 594 } 595 } 596 597 /* do standard timing section */ 598 for (i = 0; i < EDID_STD_TIMING_COUNT; i++) { 599 struct videomode mode, *exist_mode; 600 if (edid_std_timing(data + EDID_OFFSET_STD_TIMING + i * 2, 601 &mode)) { 602 /* Does this mode already exist? */ 603 exist_mode = edid_search_mode(edid, &mode); 604 if (exist_mode == NULL) { 605 edid->edid_modes[edid->edid_nmodes] = mode; 606 edid->edid_nmodes++; 607 } 608 } 609 } 610 611 /* do detailed timings and descriptors */ 612 for (i = 0; i < EDID_BLOCK_COUNT; i++) { 613 edid_block(edid, data + EDID_OFFSET_DESC_BLOCK + 614 i * EDID_BLOCK_SIZE); 615 } 616 617 edid_strchomp(edid->edid_vendorname); 618 edid_strchomp(edid->edid_productname); 619 edid_strchomp(edid->edid_serial); 620 edid_strchomp(edid->edid_comment); 621 622 /* 623 * XXX 624 * some monitors lie about their maximum supported dot clock 625 * by claiming to support modes which need a higher dot clock 626 * than the stated maximum. 627 * For sanity's sake we bump it to the highest dot clock we find 628 * in the list of supported modes 629 */ 630 for (i = 0; i < edid->edid_nmodes; i++) 631 if (edid->edid_modes[i].dot_clock > max_dotclock) 632 max_dotclock = edid->edid_modes[i].dot_clock; 633 if (bootverbose) { 634 printf("edid: max_dotclock according to supported modes: %d\n", 635 max_dotclock); 636 } 637 mhz = (max_dotclock + 999) / 1000; 638 639 if (edid->edid_have_range) { 640 if (mhz > edid->edid_range.er_max_clock) 641 edid->edid_range.er_max_clock = mhz; 642 } else 643 edid->edid_range.er_max_clock = mhz; 644 645 return 0; 646} 647 648