sys/dev/videomode/edid.c

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