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   1 /*
   2  * linux/drivers/video/fbmon.c
   3  *
   4  * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
   5  *
   6  * Credits:
   7  *
   8  * The EDID Parser is a conglomeration from the following sources:
   9  *
  10  *   1. SciTech SNAP Graphics Architecture
  11  *      Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
  12  *
  13  *   2. XFree86 4.3.0, interpret_edid.c
  14  *      Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
  15  *
  16  *   3. John Fremlin <vii@users.sourceforge.net> and
  17  *      Ani Joshi <ajoshi@unixbox.com>
  18  *
  19  * Generalized Timing Formula is derived from:
  20  *
  21  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  22  *      available at http://www.vesa.org
  23  *
  24  * This file is subject to the terms and conditions of the GNU General Public
  25  * License.  See the file COPYING in the main directory of this archive
  26  * for more details.
  27  *
  28  */
  29 #include <linux/fb.h>
  30 #include <linux/module.h>
  31 #include <linux/pci.h>
  32 #include <video/edid.h>
  33 #ifdef CONFIG_PPC_OF
  34 #include <asm/prom.h>
  35 #include <asm/pci-bridge.h>
  36 #endif
  37 #include "edid.h"
  38
  39 /*
  40  * EDID parser
  41  */
  42
  43 #undef DEBUG  /* define this for verbose EDID parsing output */
  44
  45 #ifdef DEBUG
  46 #define DPRINTK(fmt, args...) printk(fmt,## args)
  47 #else
  48 #define DPRINTK(fmt, args...)
  49 #endif
  50
  51 #define FBMON_FIX_HEADER  1
  52 #define FBMON_FIX_INPUT   2
  53 #define FBMON_FIX_TIMINGS 3
  54
  55 #ifdef CONFIG_FB_MODE_HELPERS
  56 struct broken_edid {
  57         u8  manufacturer[4];
  58         u32 model;
  59         u32 fix;
  60 };
  61
  62 static const struct broken_edid brokendb[] = {
  63         /* DEC FR-PCXAV-YZ */
  64         {
  65                 .manufacturer = "DEC",
  66                 .model        = 0x073a,
  67                 .fix          = FBMON_FIX_HEADER,
  68         },
  69         /* ViewSonic PF775a */
  70         {
  71                 .manufacturer = "VSC",
  72                 .model        = 0x5a44,
  73                 .fix          = FBMON_FIX_INPUT,
  74         },
  75         /* Sharp UXGA? */
  76         {
  77                 .manufacturer = "SHP",
  78                 .model        = 0x138e,
  79                 .fix          = FBMON_FIX_TIMINGS,
  80         },
  81 };
  82
  83 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
  84         0xff, 0xff, 0xff, 0x00
  85 };
  86
  87 static void copy_string(unsigned char *c, unsigned char *s)
  88 {
  89   int i;
  90   c = c + 5;
  91   for (i = 0; (i < 13 && *c != 0x0A); i++)
  92     *(s++) = *(c++);
  93   *s = 0;
  94   while (i-- && (*--s == 0x20)) *s = 0;
  95 }
  96
  97 static int edid_is_serial_block(unsigned char *block)
  98 {
  99         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 100             (block[2] == 0x00) && (block[3] == 0xff) &&
 101             (block[4] == 0x00))
 102                 return 1;
 103         else
 104                 return 0;
 105 }
 106
 107 static int edid_is_ascii_block(unsigned char *block)
 108 {
 109         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 110             (block[2] == 0x00) && (block[3] == 0xfe) &&
 111             (block[4] == 0x00))
 112                 return 1;
 113         else
 114                 return 0;
 115 }
 116
 117 static int edid_is_limits_block(unsigned char *block)
 118 {
 119         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 120             (block[2] == 0x00) && (block[3] == 0xfd) &&
 121             (block[4] == 0x00))
 122                 return 1;
 123         else
 124                 return 0;
 125 }
 126
 127 static int edid_is_monitor_block(unsigned char *block)
 128 {
 129         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 130             (block[2] == 0x00) && (block[3] == 0xfc) &&
 131             (block[4] == 0x00))
 132                 return 1;
 133         else
 134                 return 0;
 135 }
 136
 137 static int edid_is_timing_block(unsigned char *block)
 138 {
 139         if ((block[0] != 0x00) || (block[1] != 0x00) ||
 140             (block[2] != 0x00) || (block[4] != 0x00))
 141                 return 1;
 142         else
 143                 return 0;
 144 }
 145
 146 static int check_edid(unsigned char *edid)
 147 {
 148         unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
 149         unsigned char *b;
 150         u32 model;
 151         int i, fix = 0, ret = 0;
 152
 153         manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 154         manufacturer[1] = ((block[0] & 0x03) << 3) +
 155                 ((block[1] & 0xe0) >> 5) + '@';
 156         manufacturer[2] = (block[1] & 0x1f) + '@';
 157         manufacturer[3] = 0;
 158         model = block[2] + (block[3] << 8);
 159
 160         for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
 161                 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
 162                         brokendb[i].model == model) {
 163                         fix = brokendb[i].fix;
 164                         break;
 165                 }
 166         }
 167
 168         switch (fix) {
 169         case FBMON_FIX_HEADER:
 170                 for (i = 0; i < 8; i++) {
 171                         if (edid[i] != edid_v1_header[i]) {
 172                                 ret = fix;
 173                                 break;
 174                         }
 175                 }
 176                 break;
 177         case FBMON_FIX_INPUT:
 178                 b = edid + EDID_STRUCT_DISPLAY;
 179                 /* Only if display is GTF capable will
 180                    the input type be reset to analog */
 181                 if (b[4] & 0x01 && b[0] & 0x80)
 182                         ret = fix;
 183                 break;
 184         case FBMON_FIX_TIMINGS:
 185                 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 186                 ret = fix;
 187
 188                 for (i = 0; i < 4; i++) {
 189                         if (edid_is_limits_block(b)) {
 190                                 ret = 0;
 191                                 break;
 192                         }
 193
 194                         b += DETAILED_TIMING_DESCRIPTION_SIZE;
 195                 }
 196
 197                 break;
 198         }
 199
 200         if (ret)
 201                 printk("fbmon: The EDID Block of "
 202                        "Manufacturer: %s Model: 0x%x is known to "
 203                        "be broken,\n",  manufacturer, model);
 204
 205         return ret;
 206 }
 207
 208 static void fix_edid(unsigned char *edid, int fix)
 209 {
 210         int i;
 211         unsigned char *b, csum = 0;
 212
 213         switch (fix) {
 214         case FBMON_FIX_HEADER:
 215                 printk("fbmon: trying a header reconstruct\n");
 216                 memcpy(edid, edid_v1_header, 8);
 217                 break;
 218         case FBMON_FIX_INPUT:
 219                 printk("fbmon: trying to fix input type\n");
 220                 b = edid + EDID_STRUCT_DISPLAY;
 221                 b[0] &= ~0x80;
 222                 edid[127] += 0x80;
 223                 break;
 224         case FBMON_FIX_TIMINGS:
 225                 printk("fbmon: trying to fix monitor timings\n");
 226                 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 227                 for (i = 0; i < 4; i++) {
 228                         if (!(edid_is_serial_block(b) ||
 229                               edid_is_ascii_block(b) ||
 230                               edid_is_monitor_block(b) ||
 231                               edid_is_timing_block(b))) {
 232                                 b[0] = 0x00;
 233                                 b[1] = 0x00;
 234                                 b[2] = 0x00;
 235                                 b[3] = 0xfd;
 236                                 b[4] = 0x00;
 237                                 b[5] = 60;   /* vfmin */
 238                                 b[6] = 60;   /* vfmax */
 239                                 b[7] = 30;   /* hfmin */
 240                                 b[8] = 75;   /* hfmax */
 241                                 b[9] = 17;   /* pixclock - 170 MHz*/
 242                                 b[10] = 0;   /* GTF */
 243                                 break;
 244                         }
 245
 246                         b += DETAILED_TIMING_DESCRIPTION_SIZE;
 247                 }
 248
 249                 for (i = 0; i < EDID_LENGTH - 1; i++)
 250                         csum += edid[i];
 251
 252                 edid[127] = 256 - csum;
 253                 break;
 254         }
 255 }
 256
 257 static int edid_checksum(unsigned char *edid)
 258 {
 259         unsigned char i, csum = 0, all_null = 0;
 260         int err = 0, fix = check_edid(edid);
 261
 262         if (fix)
 263                 fix_edid(edid, fix);
 264
 265         for (i = 0; i < EDID_LENGTH; i++) {
 266                 csum += edid[i];
 267                 all_null |= edid[i];
 268         }
 269
 270         if (csum == 0x00 && all_null) {
 271                 /* checksum passed, everything's good */
 272                 err = 1;
 273         }
 274
 275         return err;
 276 }
 277
 278 static int edid_check_header(unsigned char *edid)
 279 {
 280         int i, err = 1, fix = check_edid(edid);
 281
 282         if (fix)
 283                 fix_edid(edid, fix);
 284
 285         for (i = 0; i < 8; i++) {
 286                 if (edid[i] != edid_v1_header[i])
 287                         err = 0;
 288         }
 289
 290         return err;
 291 }
 292
 293 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
 294 {
 295         specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 296         specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
 297                 ((block[1] & 0xe0) >> 5) + '@';
 298         specs->manufacturer[2] = (block[1] & 0x1f) + '@';
 299         specs->manufacturer[3] = 0;
 300         specs->model = block[2] + (block[3] << 8);
 301         specs->serial = block[4] + (block[5] << 8) +
 302                (block[6] << 16) + (block[7] << 24);
 303         specs->year = block[9] + 1990;
 304         specs->week = block[8];
 305         DPRINTK("   Manufacturer: %s\n", specs->manufacturer);
 306         DPRINTK("   Model: %x\n", specs->model);
 307         DPRINTK("   Serial#: %u\n", specs->serial);
 308         DPRINTK("   Year: %u Week %u\n", specs->year, specs->week);
 309 }
 310
 311 static void get_dpms_capabilities(unsigned char flags,
 312                                   struct fb_monspecs *specs)
 313 {
 314         specs->dpms = 0;
 315         if (flags & DPMS_ACTIVE_OFF)
 316                 specs->dpms |= FB_DPMS_ACTIVE_OFF;
 317         if (flags & DPMS_SUSPEND)
 318                 specs->dpms |= FB_DPMS_SUSPEND;
 319         if (flags & DPMS_STANDBY)
 320                 specs->dpms |= FB_DPMS_STANDBY;
 321         DPRINTK("      DPMS: Active %s, Suspend %s, Standby %s\n",
 322                (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
 323                (flags & DPMS_SUSPEND)    ? "yes" : "no",
 324                (flags & DPMS_STANDBY)    ? "yes" : "no");
 325 }
 326
 327 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
 328 {
 329         int tmp;
 330
 331         DPRINTK("      Chroma\n");
 332         /* Chromaticity data */
 333         tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
 334         tmp *= 1000;
 335         tmp += 512;
 336         specs->chroma.redx = tmp/1024;
 337         DPRINTK("         RedX:     0.%03d ", specs->chroma.redx);
 338
 339         tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
 340         tmp *= 1000;
 341         tmp += 512;
 342         specs->chroma.redy = tmp/1024;
 343         DPRINTK("RedY:     0.%03d\n", specs->chroma.redy);
 344
 345         tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
 346         tmp *= 1000;
 347         tmp += 512;
 348         specs->chroma.greenx = tmp/1024;
 349         DPRINTK("         GreenX:   0.%03d ", specs->chroma.greenx);
 350
 351         tmp = (block[5] & 3) | (block[0xa] << 2);
 352         tmp *= 1000;
 353         tmp += 512;
 354         specs->chroma.greeny = tmp/1024;
 355         DPRINTK("GreenY:   0.%03d\n", specs->chroma.greeny);
 356
 357         tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
 358         tmp *= 1000;
 359         tmp += 512;
 360         specs->chroma.bluex = tmp/1024;
 361         DPRINTK("         BlueX:    0.%03d ", specs->chroma.bluex);
 362
 363         tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
 364         tmp *= 1000;
 365         tmp += 512;
 366         specs->chroma.bluey = tmp/1024;
 367         DPRINTK("BlueY:    0.%03d\n", specs->chroma.bluey);
 368
 369         tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
 370         tmp *= 1000;
 371         tmp += 512;
 372         specs->chroma.whitex = tmp/1024;
 373         DPRINTK("         WhiteX:   0.%03d ", specs->chroma.whitex);
 374
 375         tmp = (block[6] & 3) | (block[0xe] << 2);
 376         tmp *= 1000;
 377         tmp += 512;
 378         specs->chroma.whitey = tmp/1024;
 379         DPRINTK("WhiteY:   0.%03d\n", specs->chroma.whitey);
 380 }
 381
 382 static void calc_mode_timings(int xres, int yres, int refresh,
 383                               struct fb_videomode *mode)
 384 {
 385         struct fb_var_screeninfo *var;
 386
 387         var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
 388
 389         if (var) {
 390                 var->xres = xres;
 391                 var->yres = yres;
 392                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
 393                             refresh, var, NULL);
 394                 mode->xres = xres;
 395                 mode->yres = yres;
 396                 mode->pixclock = var->pixclock;
 397                 mode->refresh = refresh;
 398                 mode->left_margin = var->left_margin;
 399                 mode->right_margin = var->right_margin;
 400                 mode->upper_margin = var->upper_margin;
 401                 mode->lower_margin = var->lower_margin;
 402                 mode->hsync_len = var->hsync_len;
 403                 mode->vsync_len = var->vsync_len;
 404                 mode->vmode = 0;
 405                 mode->sync = 0;
 406                 kfree(var);
 407         }
 408 }
 409
 410 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
 411 {
 412         int num = 0;
 413         unsigned char c;
 414
 415         c = block[0];
 416         if (c&0x80) {
 417                 calc_mode_timings(720, 400, 70, &mode[num]);
 418                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 419                 DPRINTK("      720x400@70Hz\n");
 420         }
 421         if (c&0x40) {
 422                 calc_mode_timings(720, 400, 88, &mode[num]);
 423                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 424                 DPRINTK("      720x400@88Hz\n");
 425         }
 426         if (c&0x20) {
 427                 mode[num++] = vesa_modes[3];
 428                 DPRINTK("      640x480@60Hz\n");
 429         }
 430         if (c&0x10) {
 431                 calc_mode_timings(640, 480, 67, &mode[num]);
 432                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 433                 DPRINTK("      640x480@67Hz\n");
 434         }
 435         if (c&0x08) {
 436                 mode[num++] = vesa_modes[4];
 437                 DPRINTK("      640x480@72Hz\n");
 438         }
 439         if (c&0x04) {
 440                 mode[num++] = vesa_modes[5];
 441                 DPRINTK("      640x480@75Hz\n");
 442         }
 443         if (c&0x02) {
 444                 mode[num++] = vesa_modes[7];
 445                 DPRINTK("      800x600@56Hz\n");
 446         }
 447         if (c&0x01) {
 448                 mode[num++] = vesa_modes[8];
 449                 DPRINTK("      800x600@60Hz\n");
 450         }
 451
 452         c = block[1];
 453         if (c&0x80) {
 454                 mode[num++] = vesa_modes[9];
 455                 DPRINTK("      800x600@72Hz\n");
 456         }
 457         if (c&0x40) {
 458                 mode[num++] = vesa_modes[10];
 459                 DPRINTK("      800x600@75Hz\n");
 460         }
 461         if (c&0x20) {
 462                 calc_mode_timings(832, 624, 75, &mode[num]);
 463                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 464                 DPRINTK("      832x624@75Hz\n");
 465         }
 466         if (c&0x10) {
 467                 mode[num++] = vesa_modes[12];
 468                 DPRINTK("      1024x768@87Hz Interlaced\n");
 469         }
 470         if (c&0x08) {
 471                 mode[num++] = vesa_modes[13];
 472                 DPRINTK("      1024x768@60Hz\n");
 473         }
 474         if (c&0x04) {
 475                 mode[num++] = vesa_modes[14];
 476                 DPRINTK("      1024x768@70Hz\n");
 477         }
 478         if (c&0x02) {
 479                 mode[num++] = vesa_modes[15];
 480                 DPRINTK("      1024x768@75Hz\n");
 481         }
 482         if (c&0x01) {
 483                 mode[num++] = vesa_modes[21];
 484                 DPRINTK("      1280x1024@75Hz\n");
 485         }
 486         c = block[2];
 487         if (c&0x80) {
 488                 mode[num++] = vesa_modes[17];
 489                 DPRINTK("      1152x870@75Hz\n");
 490         }
 491         DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
 492         return num;
 493 }
 494
 495 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
 496 {
 497         int xres, yres = 0, refresh, ratio, i;
 498
 499         xres = (block[0] + 31) * 8;
 500         if (xres <= 256)
 501                 return 0;
 502
 503         ratio = (block[1] & 0xc0) >> 6;
 504         switch (ratio) {
 505         case 0:
 506                 yres = xres;
 507                 break;
 508         case 1:
 509                 yres = (xres * 3)/4;
 510                 break;
 511         case 2:
 512                 yres = (xres * 4)/5;
 513                 break;
 514         case 3:
 515                 yres = (xres * 9)/16;
 516                 break;
 517         }
 518         refresh = (block[1] & 0x3f) + 60;
 519
 520         DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 521         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 522                 if (vesa_modes[i].xres == xres &&
 523                     vesa_modes[i].yres == yres &&
 524                     vesa_modes[i].refresh == refresh) {
 525                         *mode = vesa_modes[i];
 526                         mode->flag |= FB_MODE_IS_STANDARD;
 527                         return 1;
 528                 }
 529         }
 530         calc_mode_timings(xres, yres, refresh, mode);
 531         return 1;
 532 }
 533
 534 static int get_dst_timing(unsigned char *block,
 535                           struct fb_videomode *mode)
 536 {
 537         int j, num = 0;
 538
 539         for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
 540                 num += get_std_timing(block, &mode[num]);
 541
 542         return num;
 543 }
 544
 545 static void get_detailed_timing(unsigned char *block,
 546                                 struct fb_videomode *mode)
 547 {
 548         mode->xres = H_ACTIVE;
 549         mode->yres = V_ACTIVE;
 550         mode->pixclock = PIXEL_CLOCK;
 551         mode->pixclock /= 1000;
 552         mode->pixclock = KHZ2PICOS(mode->pixclock);
 553         mode->right_margin = H_SYNC_OFFSET;
 554         mode->left_margin = (H_ACTIVE + H_BLANKING) -
 555                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 556         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 557                 V_SYNC_WIDTH;
 558         mode->lower_margin = V_SYNC_OFFSET;
 559         mode->hsync_len = H_SYNC_WIDTH;
 560         mode->vsync_len = V_SYNC_WIDTH;
 561         if (HSYNC_POSITIVE)
 562                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 563         if (VSYNC_POSITIVE)
 564                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 565         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 566                                      (V_ACTIVE + V_BLANKING));
 567         if (INTERLACED) {
 568                 mode->yres *= 2;
 569                 mode->upper_margin *= 2;
 570                 mode->lower_margin *= 2;
 571                 mode->vsync_len *= 2;
 572                 mode->vmode |= FB_VMODE_INTERLACED;
 573         }
 574         mode->flag = FB_MODE_IS_DETAILED;
 575
 576         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 577         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 578                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 579         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 580                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 581         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 582                (VSYNC_POSITIVE) ? "+" : "-");
 583 }
 584
 585 /**
 586  * fb_create_modedb - create video mode database
 587  * @edid: EDID data
 588  * @dbsize: database size
 589  *
 590  * RETURNS: struct fb_videomode, @dbsize contains length of database
 591  *
 592  * DESCRIPTION:
 593  * This function builds a mode database using the contents of the EDID
 594  * data
 595  */
 596 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 597 {
 598         struct fb_videomode *mode, *m;
 599         unsigned char *block;
 600         int num = 0, i, first = 1;
 601
 602         mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 603         if (mode == NULL)
 604                 return NULL;
 605
 606         if (edid == NULL || !edid_checksum(edid) ||
 607             !edid_check_header(edid)) {
 608                 kfree(mode);
 609                 return NULL;
 610         }
 611
 612         *dbsize = 0;
 613
 614         DPRINTK("   Detailed Timings\n");
 615         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 616         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 617                 if (!(block[0] == 0x00 && block[1] == 0x00)) {
 618                         get_detailed_timing(block, &mode[num]);
 619                         if (first) {
 620                                 mode[num].flag |= FB_MODE_IS_FIRST;
 621                                 first = 0;
 622                         }
 623                         num++;
 624                 }
 625         }
 626
 627         DPRINTK("   Supported VESA Modes\n");
 628         block = edid + ESTABLISHED_TIMING_1;
 629         num += get_est_timing(block, &mode[num]);
 630
 631         DPRINTK("   Standard Timings\n");
 632         block = edid + STD_TIMING_DESCRIPTIONS_START;
 633         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 634                 num += get_std_timing(block, &mode[num]);
 635
 636         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 637         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 638                 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 639                         num += get_dst_timing(block + 5, &mode[num]);
 640         }
 641
 642         /* Yikes, EDID data is totally useless */
 643         if (!num) {
 644                 kfree(mode);
 645                 return NULL;
 646         }
 647
 648         *dbsize = num;
 649         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 650         if (!m)
 651                 return mode;
 652         memmove(m, mode, num * sizeof(struct fb_videomode));
 653         kfree(mode);
 654         return m;
 655 }
 656
 657 /**
 658  * fb_destroy_modedb - destroys mode database
 659  * @modedb: mode database to destroy
 660  *
 661  * DESCRIPTION:
 662  * Destroy mode database created by fb_create_modedb
 663  */
 664 void fb_destroy_modedb(struct fb_videomode *modedb)
 665 {
 666         kfree(modedb);
 667 }
 668
 669 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 670 {
 671         int i, retval = 1;
 672         unsigned char *block;
 673
 674         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 675
 676         DPRINTK("      Monitor Operating Limits: ");
 677
 678         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 679                 if (edid_is_limits_block(block)) {
 680                         specs->hfmin = H_MIN_RATE * 1000;
 681                         specs->hfmax = H_MAX_RATE * 1000;
 682                         specs->vfmin = V_MIN_RATE;
 683                         specs->vfmax = V_MAX_RATE;
 684                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 685                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 686                         retval = 0;
 687                         DPRINTK("From EDID\n");
 688                         break;
 689                 }
 690         }
 691
 692         /* estimate monitor limits based on modes supported */
 693         if (retval) {
 694                 struct fb_videomode *modes, *mode;
 695                 int num_modes, hz, hscan, pixclock;
 696                 int vtotal, htotal;
 697
 698                 modes = fb_create_modedb(edid, &num_modes);
 699                 if (!modes) {
 700                         DPRINTK("None Available\n");
 701                         return 1;
 702                 }
 703
 704                 retval = 0;
 705                 for (i = 0; i < num_modes; i++) {
 706                         mode = &modes[i];
 707                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 708                         htotal = mode->xres + mode->right_margin + mode->hsync_len
 709                                 + mode->left_margin;
 710                         vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 711                                 + mode->upper_margin;
 712
 713                         if (mode->vmode & FB_VMODE_INTERLACED)
 714                                 vtotal /= 2;
 715
 716                         if (mode->vmode & FB_VMODE_DOUBLE)
 717                                 vtotal *= 2;
 718
 719                         hscan = (pixclock + htotal / 2) / htotal;
 720                         hscan = (hscan + 500) / 1000 * 1000;
 721                         hz = (hscan + vtotal / 2) / vtotal;
 722
 723                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 724                                 specs->dclkmax = pixclock;
 725
 726                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 727                                 specs->dclkmin = pixclock;
 728
 729                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 730                                 specs->hfmax = hscan;
 731
 732                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 733                                 specs->hfmin = hscan;
 734
 735                         if (specs->vfmax == 0 || specs->vfmax < hz)
 736                                 specs->vfmax = hz;
 737
 738                         if (specs->vfmin == 0 || specs->vfmin > hz)
 739                                 specs->vfmin = hz;
 740                 }
 741                 DPRINTK("Extrapolated\n");
 742                 fb_destroy_modedb(modes);
 743         }
 744         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 745                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 746                 specs->vfmax, specs->dclkmax/1000000);
 747         return retval;
 748 }
 749
 750 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 751 {
 752         unsigned char c, *block;
 753
 754         block = edid + EDID_STRUCT_DISPLAY;
 755
 756         fb_get_monitor_limits(edid, specs);
 757
 758         c = block[0] & 0x80;
 759         specs->input = 0;
 760         if (c) {
 761                 specs->input |= FB_DISP_DDI;
 762                 DPRINTK("      Digital Display Input");
 763         } else {
 764                 DPRINTK("      Analog Display Input: Input Voltage - ");
 765                 switch ((block[0] & 0x60) >> 5) {
 766                 case 0:
 767                         DPRINTK("0.700V/0.300V");
 768                         specs->input |= FB_DISP_ANA_700_300;
 769                         break;
 770                 case 1:
 771                         DPRINTK("0.714V/0.286V");
 772                         specs->input |= FB_DISP_ANA_714_286;
 773                         break;
 774                 case 2:
 775                         DPRINTK("1.000V/0.400V");
 776                         specs->input |= FB_DISP_ANA_1000_400;
 777                         break;
 778                 case 3:
 779                         DPRINTK("0.700V/0.000V");
 780                         specs->input |= FB_DISP_ANA_700_000;
 781                         break;
 782                 }
 783         }
 784         DPRINTK("\n      Sync: ");
 785         c = block[0] & 0x10;
 786         if (c)
 787                 DPRINTK("      Configurable signal level\n");
 788         c = block[0] & 0x0f;
 789         specs->signal = 0;
 790         if (c & 0x10) {
 791                 DPRINTK("Blank to Blank ");
 792                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 793         }
 794         if (c & 0x08) {
 795                 DPRINTK("Separate ");
 796                 specs->signal |= FB_SIGNAL_SEPARATE;
 797         }
 798         if (c & 0x04) {
 799                 DPRINTK("Composite ");
 800                 specs->signal |= FB_SIGNAL_COMPOSITE;
 801         }
 802         if (c & 0x02) {
 803                 DPRINTK("Sync on Green ");
 804                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 805         }
 806         if (c & 0x01) {
 807                 DPRINTK("Serration on ");
 808                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 809         }
 810         DPRINTK("\n");
 811         specs->max_x = block[1];
 812         specs->max_y = block[2];
 813         DPRINTK("      Max H-size in cm: ");
 814         if (specs->max_x)
 815                 DPRINTK("%d\n", specs->max_x);
 816         else
 817                 DPRINTK("variable\n");
 818         DPRINTK("      Max V-size in cm: ");
 819         if (specs->max_y)
 820                 DPRINTK("%d\n", specs->max_y);
 821         else
 822                 DPRINTK("variable\n");
 823
 824         c = block[3];
 825         specs->gamma = c+100;
 826         DPRINTK("      Gamma: ");
 827         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 828
 829         get_dpms_capabilities(block[4], specs);
 830
 831         switch ((block[4] & 0x18) >> 3) {
 832         case 0:
 833                 DPRINTK("      Monochrome/Grayscale\n");
 834                 specs->input |= FB_DISP_MONO;
 835                 break;
 836         case 1:
 837                 DPRINTK("      RGB Color Display\n");
 838                 specs->input |= FB_DISP_RGB;
 839                 break;
 840         case 2:
 841                 DPRINTK("      Non-RGB Multicolor Display\n");
 842                 specs->input |= FB_DISP_MULTI;
 843                 break;
 844         default:
 845                 DPRINTK("      Unknown\n");
 846                 specs->input |= FB_DISP_UNKNOWN;
 847                 break;
 848         }
 849
 850         get_chroma(block, specs);
 851
 852         specs->misc = 0;
 853         c = block[4] & 0x7;
 854         if (c & 0x04) {
 855                 DPRINTK("      Default color format is primary\n");
 856                 specs->misc |= FB_MISC_PRIM_COLOR;
 857         }
 858         if (c & 0x02) {
 859                 DPRINTK("      First DETAILED Timing is preferred\n");
 860                 specs->misc |= FB_MISC_1ST_DETAIL;
 861         }
 862         if (c & 0x01) {
 863                 printk("      Display is GTF capable\n");
 864                 specs->gtf = 1;
 865         }
 866 }
 867
 868 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 869 {
 870         int i;
 871         unsigned char *block;
 872
 873         if (edid == NULL || var == NULL)
 874                 return 1;
 875
 876         if (!(edid_checksum(edid)))
 877                 return 1;
 878
 879         if (!(edid_check_header(edid)))
 880                 return 1;
 881
 882         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 883
 884         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 885                 if (edid_is_timing_block(block)) {
 886                         var->xres = var->xres_virtual = H_ACTIVE;
 887                         var->yres = var->yres_virtual = V_ACTIVE;
 888                         var->height = var->width = 0;
 889                         var->right_margin = H_SYNC_OFFSET;
 890                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 891                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 892                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 893                                 V_SYNC_WIDTH;
 894                         var->lower_margin = V_SYNC_OFFSET;
 895                         var->hsync_len = H_SYNC_WIDTH;
 896                         var->vsync_len = V_SYNC_WIDTH;
 897                         var->pixclock = PIXEL_CLOCK;
 898                         var->pixclock /= 1000;
 899                         var->pixclock = KHZ2PICOS(var->pixclock);
 900
 901                         if (HSYNC_POSITIVE)
 902                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 903                         if (VSYNC_POSITIVE)
 904                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 905                         return 0;
 906                 }
 907         }
 908         return 1;
 909 }
 910
 911 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 912 {
 913         unsigned char *block;
 914         int i, found = 0;
 915
 916         if (edid == NULL)
 917                 return;
 918
 919         if (!(edid_checksum(edid)))
 920                 return;
 921
 922         if (!(edid_check_header(edid)))
 923                 return;
 924
 925         memset(specs, 0, sizeof(struct fb_monspecs));
 926
 927         specs->version = edid[EDID_STRUCT_VERSION];
 928         specs->revision = edid[EDID_STRUCT_REVISION];
 929
 930         DPRINTK("========================================\n");
 931         DPRINTK("Display Information (EDID)\n");
 932         DPRINTK("========================================\n");
 933         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 934                (int) specs->revision);
 935
 936         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 937
 938         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 939         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 940                 if (edid_is_serial_block(block)) {
 941                         copy_string(block, specs->serial_no);
 942                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 943                 } else if (edid_is_ascii_block(block)) {
 944                         copy_string(block, specs->ascii);
 945                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 946                 } else if (edid_is_monitor_block(block)) {
 947                         copy_string(block, specs->monitor);
 948                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 949                 }
 950         }
 951
 952         DPRINTK("   Display Characteristics:\n");
 953         get_monspecs(edid, specs);
 954
 955         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 956
 957         /*
 958          * Workaround for buggy EDIDs that sets that the first
 959          * detailed timing is preferred but has not detailed
 960          * timing specified
 961          */
 962         for (i = 0; i < specs->modedb_len; i++) {
 963                 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 964                         found = 1;
 965                         break;
 966                 }
 967         }
 968
 969         if (!found)
 970                 specs->misc &= ~FB_MISC_1ST_DETAIL;
 971
 972         DPRINTK("========================================\n");
 973 }
 974
 975 /*
 976  * VESA Generalized Timing Formula (GTF)
 977  */
 978
 979 #define FLYBACK                     550
 980 #define V_FRONTPORCH                1
 981 #define H_OFFSET                    40
 982 #define H_SCALEFACTOR               20
 983 #define H_BLANKSCALE                128
 984 #define H_GRADIENT                  600
 985 #define C_VAL                       30
 986 #define M_VAL                       300
 987
 988 struct __fb_timings {
 989         u32 dclk;
 990         u32 hfreq;
 991         u32 vfreq;
 992         u32 hactive;
 993         u32 vactive;
 994         u32 hblank;
 995         u32 vblank;
 996         u32 htotal;
 997         u32 vtotal;
 998 };
 999
1000 /**
1001  * fb_get_vblank - get vertical blank time
1002  * @hfreq: horizontal freq
1003  *
1004  * DESCRIPTION:
1005  * vblank = right_margin + vsync_len + left_margin
1006  *
1007  *    given: right_margin = 1 (V_FRONTPORCH)
1008  *           vsync_len    = 3
1009  *           flyback      = 550
1010  *
1011  *                          flyback * hfreq
1012  *           left_margin  = --------------- - vsync_len
1013  *                           1000000
1014  */
1015 static u32 fb_get_vblank(u32 hfreq)
1016 {
1017         u32 vblank;
1018
1019         vblank = (hfreq * FLYBACK)/1000;
1020         vblank = (vblank + 500)/1000;
1021         return (vblank + V_FRONTPORCH);
1022 }
1023
1024 /**
1025  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1026  * @hfreq: horizontal freq
1027  * @xres: horizontal resolution in pixels
1028  *
1029  * DESCRIPTION:
1030  *
1031  *           xres * duty_cycle
1032  * hblank = ------------------
1033  *           100 - duty_cycle
1034  *
1035  * duty cycle = percent of htotal assigned to inactive display
1036  * duty cycle = C - (M/Hfreq)
1037  *
1038  * where: C = ((offset - scale factor) * blank_scale)
1039  *            -------------------------------------- + scale factor
1040  *                        256
1041  *        M = blank_scale * gradient
1042  *
1043  */
1044 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1045 {
1046         u32 c_val, m_val, duty_cycle, hblank;
1047
1048         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1049                  H_SCALEFACTOR) * 1000;
1050         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1051         m_val = (m_val * 1000000)/hfreq;
1052         duty_cycle = c_val - m_val;
1053         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1054         return (hblank);
1055 }
1056
1057 /**
1058  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1059  * @dclk: pixelclock in Hz
1060  * @xres: horizontal resolution in pixels
1061  *
1062  * DESCRIPTION:
1063  *
1064  *           xres * duty_cycle
1065  * hblank = ------------------
1066  *           100 - duty_cycle
1067  *
1068  * duty cycle = percent of htotal assigned to inactive display
1069  * duty cycle = C - (M * h_period)
1070  *
1071  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1072  *                   -----------------------------------------------
1073  *                                    2 * M
1074  *        M = 300;
1075  *        C = 30;
1076
1077  */
1078 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1079 {
1080         u32 duty_cycle, h_period, hblank;
1081
1082         dclk /= 1000;
1083         h_period = 100 - C_VAL;
1084         h_period *= h_period;
1085         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1086         h_period *= 10000;
1087
1088         h_period = int_sqrt(h_period);
1089         h_period -= (100 - C_VAL) * 100;
1090         h_period *= 1000;
1091         h_period /= 2 * M_VAL;
1092
1093         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1094         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1095         hblank &= ~15;
1096         return (hblank);
1097 }
1098
1099 /**
1100  * fb_get_hfreq - estimate hsync
1101  * @vfreq: vertical refresh rate
1102  * @yres: vertical resolution
1103  *
1104  * DESCRIPTION:
1105  *
1106  *          (yres + front_port) * vfreq * 1000000
1107  * hfreq = -------------------------------------
1108  *          (1000000 - (vfreq * FLYBACK)
1109  *
1110  */
1111
1112 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1113 {
1114         u32 divisor, hfreq;
1115
1116         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1117         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1118         return (hfreq/divisor);
1119 }
1120
1121 static void fb_timings_vfreq(struct __fb_timings *timings)
1122 {
1123         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1124         timings->vblank = fb_get_vblank(timings->hfreq);
1125         timings->vtotal = timings->vactive + timings->vblank;
1126         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1127                                                  timings->hactive);
1128         timings->htotal = timings->hactive + timings->hblank;
1129         timings->dclk = timings->htotal * timings->hfreq;
1130 }
1131
1132 static void fb_timings_hfreq(struct __fb_timings *timings)
1133 {
1134         timings->vblank = fb_get_vblank(timings->hfreq);
1135         timings->vtotal = timings->vactive + timings->vblank;
1136         timings->vfreq = timings->hfreq/timings->vtotal;
1137         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1138                                                  timings->hactive);
1139         timings->htotal = timings->hactive + timings->hblank;
1140         timings->dclk = timings->htotal * timings->hfreq;
1141 }
1142
1143 static void fb_timings_dclk(struct __fb_timings *timings)
1144 {
1145         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1146                                                 timings->hactive);
1147         timings->htotal = timings->hactive + timings->hblank;
1148         timings->hfreq = timings->dclk/timings->htotal;
1149         timings->vblank = fb_get_vblank(timings->hfreq);
1150         timings->vtotal = timings->vactive + timings->vblank;
1151         timings->vfreq = timings->hfreq/timings->vtotal;
1152 }
1153
1154 /*
1155  * fb_get_mode - calculates video mode using VESA GTF
1156  * @flags: if: 0 - maximize vertical refresh rate
1157  *             1 - vrefresh-driven calculation;
1158  *             2 - hscan-driven calculation;
1159  *             3 - pixelclock-driven calculation;
1160  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1161  * @var: pointer to fb_var_screeninfo
1162  * @info: pointer to fb_info
1163  *
1164  * DESCRIPTION:
1165  * Calculates video mode based on monitor specs using VESA GTF.
1166  * The GTF is best for VESA GTF compliant monitors but is
1167  * specifically formulated to work for older monitors as well.
1168  *
1169  * If @flag==0, the function will attempt to maximize the
1170  * refresh rate.  Otherwise, it will calculate timings based on
1171  * the flag and accompanying value.
1172  *
1173  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1174  * ignored and @var will be filled with the calculated timings.
1175  *
1176  * All calculations are based on the VESA GTF Spreadsheet
1177  * available at VESA's public ftp (http://www.vesa.org).
1178  *
1179  * NOTES:
1180  * The timings generated by the GTF will be different from VESA
1181  * DMT.  It might be a good idea to keep a table of standard
1182  * VESA modes as well.  The GTF may also not work for some displays,
1183  * such as, and especially, analog TV.
1184  *
1185  * REQUIRES:
1186  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1187  */
1188 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1189 {
1190         struct __fb_timings *timings;
1191         u32 interlace = 1, dscan = 1;
1192         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1193
1194
1195         timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1196
1197         if (!timings)
1198                 return -ENOMEM;
1199
1200         /*
1201          * If monspecs are invalid, use values that are enough
1202          * for 640x480@60
1203          */
1204         if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1205             !info->monspecs.dclkmax ||
1206             info->monspecs.hfmax < info->monspecs.hfmin ||
1207             info->monspecs.vfmax < info->monspecs.vfmin ||
1208             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1209                 hfmin = 29000; hfmax = 30000;
1210                 vfmin = 60; vfmax = 60;
1211                 dclkmin = 0; dclkmax = 25000000;
1212         } else {
1213                 hfmin = info->monspecs.hfmin;
1214                 hfmax = info->monspecs.hfmax;
1215                 vfmin = info->monspecs.vfmin;
1216                 vfmax = info->monspecs.vfmax;
1217                 dclkmin = info->monspecs.dclkmin;
1218                 dclkmax = info->monspecs.dclkmax;
1219         }
1220
1221         timings->hactive = var->xres;
1222         timings->vactive = var->yres;
1223         if (var->vmode & FB_VMODE_INTERLACED) {
1224                 timings->vactive /= 2;
1225                 interlace = 2;
1226         }
1227         if (var->vmode & FB_VMODE_DOUBLE) {
1228                 timings->vactive *= 2;
1229                 dscan = 2;
1230         }
1231
1232         switch (flags & ~FB_IGNOREMON) {
1233         case FB_MAXTIMINGS: /* maximize refresh rate */
1234                 timings->hfreq = hfmax;
1235                 fb_timings_hfreq(timings);
1236                 if (timings->vfreq > vfmax) {
1237                         timings->vfreq = vfmax;
1238                         fb_timings_vfreq(timings);
1239                 }
1240                 if (timings->dclk > dclkmax) {
1241                         timings->dclk = dclkmax;
1242                         fb_timings_dclk(timings);
1243                 }
1244                 break;
1245         case FB_VSYNCTIMINGS: /* vrefresh driven */
1246                 timings->vfreq = val;
1247                 fb_timings_vfreq(timings);
1248                 break;
1249         case FB_HSYNCTIMINGS: /* hsync driven */
1250                 timings->hfreq = val;
1251                 fb_timings_hfreq(timings);
1252                 break;
1253         case FB_DCLKTIMINGS: /* pixelclock driven */
1254                 timings->dclk = PICOS2KHZ(val) * 1000;
1255                 fb_timings_dclk(timings);
1256                 break;
1257         default:
1258                 err = -EINVAL;
1259
1260         }
1261
1262         if (err || (!(flags & FB_IGNOREMON) &&
1263             (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1264              timings->hfreq < hfmin || timings->hfreq > hfmax ||
1265              timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1266                 err = -EINVAL;
1267         } else {
1268                 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1269                 var->hsync_len = (timings->htotal * 8)/100;
1270                 var->right_margin = (timings->hblank/2) - var->hsync_len;
1271                 var->left_margin = timings->hblank - var->right_margin -
1272                         var->hsync_len;
1273                 var->vsync_len = (3 * interlace)/dscan;
1274                 var->lower_margin = (1 * interlace)/dscan;
1275                 var->upper_margin = (timings->vblank * interlace)/dscan -
1276                         (var->vsync_len + var->lower_margin);
1277         }
1278
1279         kfree(timings);
1280         return err;
1281 }
1282 #else
1283 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1284 {
1285         return 1;
1286 }
1287 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1288 {
1289         specs = NULL;
1290 }
1291 void fb_destroy_modedb(struct fb_videomode *modedb)
1292 {
1293 }
1294 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1295                 struct fb_info *info)
1296 {
1297         return -EINVAL;
1298 }
1299 #endif /* CONFIG_FB_MODE_HELPERS */
1300
1301 /*
1302  * fb_validate_mode - validates var against monitor capabilities
1303  * @var: pointer to fb_var_screeninfo
1304  * @info: pointer to fb_info
1305  *
1306  * DESCRIPTION:
1307  * Validates video mode against monitor capabilities specified in
1308  * info->monspecs.
1309  *
1310  * REQUIRES:
1311  * A valid info->monspecs.
1312  */
1313 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1314 {
1315         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1316         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1317
1318         /*
1319          * If monspecs are invalid, use values that are enough
1320          * for 640x480@60
1321          */
1322         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1323             !info->monspecs.dclkmax ||
1324             info->monspecs.hfmax < info->monspecs.hfmin ||
1325             info->monspecs.vfmax < info->monspecs.vfmin ||
1326             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1327                 hfmin = 29000; hfmax = 30000;
1328                 vfmin = 60; vfmax = 60;
1329                 dclkmin = 0; dclkmax = 25000000;
1330         } else {
1331                 hfmin = info->monspecs.hfmin;
1332                 hfmax = info->monspecs.hfmax;
1333                 vfmin = info->monspecs.vfmin;
1334                 vfmax = info->monspecs.vfmax;
1335                 dclkmin = info->monspecs.dclkmin;
1336                 dclkmax = info->monspecs.dclkmax;
1337         }
1338
1339         if (!var->pixclock)
1340                 return -EINVAL;
1341         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1342
1343         htotal = var->xres + var->right_margin + var->hsync_len +
1344                 var->left_margin;
1345         vtotal = var->yres + var->lower_margin + var->vsync_len +
1346                 var->upper_margin;
1347
1348         if (var->vmode & FB_VMODE_INTERLACED)
1349                 vtotal /= 2;
1350         if (var->vmode & FB_VMODE_DOUBLE)
1351                 vtotal *= 2;
1352
1353         hfreq = pixclock/htotal;
1354         hfreq = (hfreq + 500) / 1000 * 1000;
1355
1356         vfreq = hfreq/vtotal;
1357
1358         return (vfreq < vfmin || vfreq > vfmax ||
1359                 hfreq < hfmin || hfreq > hfmax ||
1360                 pixclock < dclkmin || pixclock > dclkmax) ?
1361                 -EINVAL : 0;
1362 }
1363
1364 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1365
1366 /*
1367  * We need to ensure that the EDID block is only returned for
1368  * the primary graphics adapter.
1369  */
1370
1371 const unsigned char *fb_firmware_edid(struct device *device)
1372 {
1373         struct pci_dev *dev = NULL;
1374         struct resource *res = NULL;
1375         unsigned char *edid = NULL;
1376
1377         if (device)
1378                 dev = to_pci_dev(device);
1379
1380         if (dev)
1381                 res = &dev->resource[PCI_ROM_RESOURCE];
1382
1383         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1384                 edid = edid_info.dummy;
1385
1386         return edid;
1387 }
1388 #else
1389 const unsigned char *fb_firmware_edid(struct device *device)
1390 {
1391         return NULL;
1392 }
1393 #endif
1394 EXPORT_SYMBOL(fb_firmware_edid);
1395
1396 EXPORT_SYMBOL(fb_parse_edid);
1397 EXPORT_SYMBOL(fb_edid_to_monspecs);
1398 EXPORT_SYMBOL(fb_get_mode);
1399 EXPORT_SYMBOL(fb_validate_mode);
1400 EXPORT_SYMBOL(fb_destroy_modedb);