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