drivers/video/fbmon.c

   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         mode->vmode = 0;
 568         mode->flag = FB_MODE_IS_DETAILED;
 569
 570         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 571         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 572                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 573         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 574                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 575         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 576                (VSYNC_POSITIVE) ? "+" : "-");
 577 }
 578
 579 /**
 580  * fb_create_modedb - create video mode database
 581  * @edid: EDID data
 582  * @dbsize: database size
 583  *
 584  * RETURNS: struct fb_videomode, @dbsize contains length of database
 585  *
 586  * DESCRIPTION:
 587  * This function builds a mode database using the contents of the EDID
 588  * data
 589  */
 590 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 591 {
 592         struct fb_videomode *mode, *m;
 593         unsigned char *block;
 594         int num = 0, i;
 595
 596         mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 597         if (mode == NULL)
 598                 return NULL;
 599
 600         if (edid == NULL || !edid_checksum(edid) ||
 601             !edid_check_header(edid)) {
 602                 kfree(mode);
 603                 return NULL;
 604         }
 605
 606         *dbsize = 0;
 607
 608         DPRINTK("   Detailed Timings\n");
 609         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 610         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 611                 int first = 1;
 612
 613                 if (!(block[0] == 0x00 && block[1] == 0x00)) {
 614                         get_detailed_timing(block, &mode[num]);
 615                         if (first) {
 616                                 mode[num].flag |= FB_MODE_IS_FIRST;
 617                                 first = 0;
 618                         }
 619                         num++;
 620                 }
 621         }
 622
 623         DPRINTK("   Supported VESA Modes\n");
 624         block = edid + ESTABLISHED_TIMING_1;
 625         num += get_est_timing(block, &mode[num]);
 626
 627         DPRINTK("   Standard Timings\n");
 628         block = edid + STD_TIMING_DESCRIPTIONS_START;
 629         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 630                 num += get_std_timing(block, &mode[num]);
 631
 632         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 633         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 634                 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 635                         num += get_dst_timing(block + 5, &mode[num]);
 636         }
 637
 638         /* Yikes, EDID data is totally useless */
 639         if (!num) {
 640                 kfree(mode);
 641                 return NULL;
 642         }
 643
 644         *dbsize = num;
 645         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 646         if (!m)
 647                 return mode;
 648         memmove(m, mode, num * sizeof(struct fb_videomode));
 649         kfree(mode);
 650         return m;
 651 }
 652
 653 /**
 654  * fb_destroy_modedb - destroys mode database
 655  * @modedb: mode database to destroy
 656  *
 657  * DESCRIPTION:
 658  * Destroy mode database created by fb_create_modedb
 659  */
 660 void fb_destroy_modedb(struct fb_videomode *modedb)
 661 {
 662         kfree(modedb);
 663 }
 664
 665 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 666 {
 667         int i, retval = 1;
 668         unsigned char *block;
 669
 670         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 671
 672         DPRINTK("      Monitor Operating Limits: ");
 673
 674         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 675                 if (edid_is_limits_block(block)) {
 676                         specs->hfmin = H_MIN_RATE * 1000;
 677                         specs->hfmax = H_MAX_RATE * 1000;
 678                         specs->vfmin = V_MIN_RATE;
 679                         specs->vfmax = V_MAX_RATE;
 680                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 681                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 682                         retval = 0;
 683                         DPRINTK("From EDID\n");
 684                         break;
 685                 }
 686         }
 687
 688         /* estimate monitor limits based on modes supported */
 689         if (retval) {
 690                 struct fb_videomode *modes, *mode;
 691                 int num_modes, i, hz, hscan, pixclock;
 692                 int vtotal, htotal;
 693
 694                 modes = fb_create_modedb(edid, &num_modes);
 695                 if (!modes) {
 696                         DPRINTK("None Available\n");
 697                         return 1;
 698                 }
 699
 700                 retval = 0;
 701                 for (i = 0; i < num_modes; i++) {
 702                         mode = &modes[i];
 703                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 704                         htotal = mode->xres + mode->right_margin + mode->hsync_len
 705                                 + mode->left_margin;
 706                         vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 707                                 + mode->upper_margin;
 708
 709                         if (mode->vmode & FB_VMODE_INTERLACED)
 710                                 vtotal /= 2;
 711
 712                         if (mode->vmode & FB_VMODE_DOUBLE)
 713                                 vtotal *= 2;
 714
 715                         hscan = (pixclock + htotal / 2) / htotal;
 716                         hscan = (hscan + 500) / 1000 * 1000;
 717                         hz = (hscan + vtotal / 2) / vtotal;
 718
 719                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 720                                 specs->dclkmax = pixclock;
 721
 722                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 723                                 specs->dclkmin = pixclock;
 724
 725                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 726                                 specs->hfmax = hscan;
 727
 728                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 729                                 specs->hfmin = hscan;
 730
 731                         if (specs->vfmax == 0 || specs->vfmax < hz)
 732                                 specs->vfmax = hz;
 733
 734                         if (specs->vfmin == 0 || specs->vfmin > hz)
 735                                 specs->vfmin = hz;
 736                 }
 737                 DPRINTK("Extrapolated\n");
 738                 fb_destroy_modedb(modes);
 739         }
 740         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 741                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 742                 specs->vfmax, specs->dclkmax/1000000);
 743         return retval;
 744 }
 745
 746 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 747 {
 748         unsigned char c, *block;
 749
 750         block = edid + EDID_STRUCT_DISPLAY;
 751
 752         fb_get_monitor_limits(edid, specs);
 753
 754         c = block[0] & 0x80;
 755         specs->input = 0;
 756         if (c) {
 757                 specs->input |= FB_DISP_DDI;
 758                 DPRINTK("      Digital Display Input");
 759         } else {
 760                 DPRINTK("      Analog Display Input: Input Voltage - ");
 761                 switch ((block[0] & 0x60) >> 5) {
 762                 case 0:
 763                         DPRINTK("0.700V/0.300V");
 764                         specs->input |= FB_DISP_ANA_700_300;
 765                         break;
 766                 case 1:
 767                         DPRINTK("0.714V/0.286V");
 768                         specs->input |= FB_DISP_ANA_714_286;
 769                         break;
 770                 case 2:
 771                         DPRINTK("1.000V/0.400V");
 772                         specs->input |= FB_DISP_ANA_1000_400;
 773                         break;
 774                 case 3:
 775                         DPRINTK("0.700V/0.000V");
 776                         specs->input |= FB_DISP_ANA_700_000;
 777                         break;
 778                 }
 779         }
 780         DPRINTK("\n      Sync: ");
 781         c = block[0] & 0x10;
 782         if (c)
 783                 DPRINTK("      Configurable signal level\n");
 784         c = block[0] & 0x0f;
 785         specs->signal = 0;
 786         if (c & 0x10) {
 787                 DPRINTK("Blank to Blank ");
 788                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 789         }
 790         if (c & 0x08) {
 791                 DPRINTK("Separate ");
 792                 specs->signal |= FB_SIGNAL_SEPARATE;
 793         }
 794         if (c & 0x04) {
 795                 DPRINTK("Composite ");
 796                 specs->signal |= FB_SIGNAL_COMPOSITE;
 797         }
 798         if (c & 0x02) {
 799                 DPRINTK("Sync on Green ");
 800                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 801         }
 802         if (c & 0x01) {
 803                 DPRINTK("Serration on ");
 804                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 805         }
 806         DPRINTK("\n");
 807         specs->max_x = block[1];
 808         specs->max_y = block[2];
 809         DPRINTK("      Max H-size in cm: ");
 810         if (specs->max_x)
 811                 DPRINTK("%d\n", specs->max_x);
 812         else
 813                 DPRINTK("variable\n");
 814         DPRINTK("      Max V-size in cm: ");
 815         if (specs->max_y)
 816                 DPRINTK("%d\n", specs->max_y);
 817         else
 818                 DPRINTK("variable\n");
 819
 820         c = block[3];
 821         specs->gamma = c+100;
 822         DPRINTK("      Gamma: ");
 823         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 824
 825         get_dpms_capabilities(block[4], specs);
 826
 827         switch ((block[4] & 0x18) >> 3) {
 828         case 0:
 829                 DPRINTK("      Monochrome/Grayscale\n");
 830                 specs->input |= FB_DISP_MONO;
 831                 break;
 832         case 1:
 833                 DPRINTK("      RGB Color Display\n");
 834                 specs->input |= FB_DISP_RGB;
 835                 break;
 836         case 2:
 837                 DPRINTK("      Non-RGB Multicolor Display\n");
 838                 specs->input |= FB_DISP_MULTI;
 839                 break;
 840         default:
 841                 DPRINTK("      Unknown\n");
 842                 specs->input |= FB_DISP_UNKNOWN;
 843                 break;
 844         }
 845
 846         get_chroma(block, specs);
 847
 848         specs->misc = 0;
 849         c = block[4] & 0x7;
 850         if (c & 0x04) {
 851                 DPRINTK("      Default color format is primary\n");
 852                 specs->misc |= FB_MISC_PRIM_COLOR;
 853         }
 854         if (c & 0x02) {
 855                 DPRINTK("      First DETAILED Timing is preferred\n");
 856                 specs->misc |= FB_MISC_1ST_DETAIL;
 857         }
 858         if (c & 0x01) {
 859                 printk("      Display is GTF capable\n");
 860                 specs->gtf = 1;
 861         }
 862 }
 863
 864 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 865 {
 866         int i;
 867         unsigned char *block;
 868
 869         if (edid == NULL || var == NULL)
 870                 return 1;
 871
 872         if (!(edid_checksum(edid)))
 873                 return 1;
 874
 875         if (!(edid_check_header(edid)))
 876                 return 1;
 877
 878         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 879
 880         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 881                 if (edid_is_timing_block(block)) {
 882                         var->xres = var->xres_virtual = H_ACTIVE;
 883                         var->yres = var->yres_virtual = V_ACTIVE;
 884                         var->height = var->width = -1;
 885                         var->right_margin = H_SYNC_OFFSET;
 886                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 887                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 888                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 889                                 V_SYNC_WIDTH;
 890                         var->lower_margin = V_SYNC_OFFSET;
 891                         var->hsync_len = H_SYNC_WIDTH;
 892                         var->vsync_len = V_SYNC_WIDTH;
 893                         var->pixclock = PIXEL_CLOCK;
 894                         var->pixclock /= 1000;
 895                         var->pixclock = KHZ2PICOS(var->pixclock);
 896
 897                         if (HSYNC_POSITIVE)
 898                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 899                         if (VSYNC_POSITIVE)
 900                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 901                         return 0;
 902                 }
 903         }
 904         return 1;
 905 }
 906
 907 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 908 {
 909         unsigned char *block;
 910         int i, found = 0;
 911
 912         if (edid == NULL)
 913                 return;
 914
 915         if (!(edid_checksum(edid)))
 916                 return;
 917
 918         if (!(edid_check_header(edid)))
 919                 return;
 920
 921         memset(specs, 0, sizeof(struct fb_monspecs));
 922
 923         specs->version = edid[EDID_STRUCT_VERSION];
 924         specs->revision = edid[EDID_STRUCT_REVISION];
 925
 926         DPRINTK("========================================\n");
 927         DPRINTK("Display Information (EDID)\n");
 928         DPRINTK("========================================\n");
 929         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 930                (int) specs->revision);
 931
 932         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 933
 934         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 935         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 936                 if (edid_is_serial_block(block)) {
 937                         copy_string(block, specs->serial_no);
 938                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 939                 } else if (edid_is_ascii_block(block)) {
 940                         copy_string(block, specs->ascii);
 941                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 942                 } else if (edid_is_monitor_block(block)) {
 943                         copy_string(block, specs->monitor);
 944                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 945                 }
 946         }
 947
 948         DPRINTK("   Display Characteristics:\n");
 949         get_monspecs(edid, specs);
 950
 951         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 952
 953         /*
 954          * Workaround for buggy EDIDs that sets that the first
 955          * detailed timing is preferred but has not detailed
 956          * timing specified
 957          */
 958         for (i = 0; i < specs->modedb_len; i++) {
 959                 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 960                         found = 1;
 961                         break;
 962                 }
 963         }
 964
 965         if (!found)
 966                 specs->misc &= ~FB_MISC_1ST_DETAIL;
 967
 968         DPRINTK("========================================\n");
 969 }
 970
 971 /*
 972  * VESA Generalized Timing Formula (GTF)
 973  */
 974
 975 #define FLYBACK                     550
 976 #define V_FRONTPORCH                1
 977 #define H_OFFSET                    40
 978 #define H_SCALEFACTOR               20
 979 #define H_BLANKSCALE                128
 980 #define H_GRADIENT                  600
 981 #define C_VAL                       30
 982 #define M_VAL                       300
 983
 984 struct __fb_timings {
 985         u32 dclk;
 986         u32 hfreq;
 987         u32 vfreq;
 988         u32 hactive;
 989         u32 vactive;
 990         u32 hblank;
 991         u32 vblank;
 992         u32 htotal;
 993         u32 vtotal;
 994 };
 995
 996 /**
 997  * fb_get_vblank - get vertical blank time
 998  * @hfreq: horizontal freq
 999  *
1000  * DESCRIPTION:
1001  * vblank = right_margin + vsync_len + left_margin
1002  *
1003  *    given: right_margin = 1 (V_FRONTPORCH)
1004  *           vsync_len    = 3
1005  *           flyback      = 550
1006  *
1007  *                          flyback * hfreq
1008  *           left_margin  = --------------- - vsync_len
1009  *                           1000000
1010  */
1011 static u32 fb_get_vblank(u32 hfreq)
1012 {
1013         u32 vblank;
1014
1015         vblank = (hfreq * FLYBACK)/1000;
1016         vblank = (vblank + 500)/1000;
1017         return (vblank + V_FRONTPORCH);
1018 }
1019
1020 /**
1021  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1022  * @hfreq: horizontal freq
1023  * @xres: horizontal resolution in pixels
1024  *
1025  * DESCRIPTION:
1026  *
1027  *           xres * duty_cycle
1028  * hblank = ------------------
1029  *           100 - duty_cycle
1030  *
1031  * duty cycle = percent of htotal assigned to inactive display
1032  * duty cycle = C - (M/Hfreq)
1033  *
1034  * where: C = ((offset - scale factor) * blank_scale)
1035  *            -------------------------------------- + scale factor
1036  *                        256
1037  *        M = blank_scale * gradient
1038  *
1039  */
1040 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1041 {
1042         u32 c_val, m_val, duty_cycle, hblank;
1043
1044         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1045                  H_SCALEFACTOR) * 1000;
1046         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1047         m_val = (m_val * 1000000)/hfreq;
1048         duty_cycle = c_val - m_val;
1049         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1050         return (hblank);
1051 }
1052
1053 /**
1054  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1055  * @dclk: pixelclock in Hz
1056  * @xres: horizontal resolution in pixels
1057  *
1058  * DESCRIPTION:
1059  *
1060  *           xres * duty_cycle
1061  * hblank = ------------------
1062  *           100 - duty_cycle
1063  *
1064  * duty cycle = percent of htotal assigned to inactive display
1065  * duty cycle = C - (M * h_period)
1066  *
1067  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1068  *                   -----------------------------------------------
1069  *                                    2 * M
1070  *        M = 300;
1071  *        C = 30;
1072
1073  */
1074 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1075 {
1076         u32 duty_cycle, h_period, hblank;
1077
1078         dclk /= 1000;
1079         h_period = 100 - C_VAL;
1080         h_period *= h_period;
1081         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1082         h_period *=10000;
1083
1084         h_period = int_sqrt(h_period);
1085         h_period -= (100 - C_VAL) * 100;
1086         h_period *= 1000;
1087         h_period /= 2 * M_VAL;
1088
1089         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1090         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1091         hblank &= ~15;
1092         return (hblank);
1093 }
1094
1095 /**
1096  * fb_get_hfreq - estimate hsync
1097  * @vfreq: vertical refresh rate
1098  * @yres: vertical resolution
1099  *
1100  * DESCRIPTION:
1101  *
1102  *          (yres + front_port) * vfreq * 1000000
1103  * hfreq = -------------------------------------
1104  *          (1000000 - (vfreq * FLYBACK)
1105  *
1106  */
1107
1108 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1109 {
1110         u32 divisor, hfreq;
1111
1112         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1113         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1114         return (hfreq/divisor);
1115 }
1116
1117 static void fb_timings_vfreq(struct __fb_timings *timings)
1118 {
1119         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1120         timings->vblank = fb_get_vblank(timings->hfreq);
1121         timings->vtotal = timings->vactive + timings->vblank;
1122         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1123                                                  timings->hactive);
1124         timings->htotal = timings->hactive + timings->hblank;
1125         timings->dclk = timings->htotal * timings->hfreq;
1126 }
1127
1128 static void fb_timings_hfreq(struct __fb_timings *timings)
1129 {
1130         timings->vblank = fb_get_vblank(timings->hfreq);
1131         timings->vtotal = timings->vactive + timings->vblank;
1132         timings->vfreq = timings->hfreq/timings->vtotal;
1133         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1134                                                  timings->hactive);
1135         timings->htotal = timings->hactive + timings->hblank;
1136         timings->dclk = timings->htotal * timings->hfreq;
1137 }
1138
1139 static void fb_timings_dclk(struct __fb_timings *timings)
1140 {
1141         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1142                                                 timings->hactive);
1143         timings->htotal = timings->hactive + timings->hblank;
1144         timings->hfreq = timings->dclk/timings->htotal;
1145         timings->vblank = fb_get_vblank(timings->hfreq);
1146         timings->vtotal = timings->vactive + timings->vblank;
1147         timings->vfreq = timings->hfreq/timings->vtotal;
1148 }
1149
1150 /*
1151  * fb_get_mode - calculates video mode using VESA GTF
1152  * @flags: if: 0 - maximize vertical refresh rate
1153  *             1 - vrefresh-driven calculation;
1154  *             2 - hscan-driven calculation;
1155  *             3 - pixelclock-driven calculation;
1156  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1157  * @var: pointer to fb_var_screeninfo
1158  * @info: pointer to fb_info
1159  *
1160  * DESCRIPTION:
1161  * Calculates video mode based on monitor specs using VESA GTF.
1162  * The GTF is best for VESA GTF compliant monitors but is
1163  * specifically formulated to work for older monitors as well.
1164  *
1165  * If @flag==0, the function will attempt to maximize the
1166  * refresh rate.  Otherwise, it will calculate timings based on
1167  * the flag and accompanying value.
1168  *
1169  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1170  * ignored and @var will be filled with the calculated timings.
1171  *
1172  * All calculations are based on the VESA GTF Spreadsheet
1173  * available at VESA's public ftp (http://www.vesa.org).
1174  *
1175  * NOTES:
1176  * The timings generated by the GTF will be different from VESA
1177  * DMT.  It might be a good idea to keep a table of standard
1178  * VESA modes as well.  The GTF may also not work for some displays,
1179  * such as, and especially, analog TV.
1180  *
1181  * REQUIRES:
1182  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1183  */
1184 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1185 {
1186         struct __fb_timings *timings;
1187         u32 interlace = 1, dscan = 1;
1188         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1189
1190
1191         timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1192
1193         if (!timings)
1194                 return -ENOMEM;
1195
1196         /*
1197          * If monspecs are invalid, use values that are enough
1198          * for 640x480@60
1199          */
1200         if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1201             !info->monspecs.dclkmax ||
1202             info->monspecs.hfmax < info->monspecs.hfmin ||
1203             info->monspecs.vfmax < info->monspecs.vfmin ||
1204             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1205                 hfmin = 29000; hfmax = 30000;
1206                 vfmin = 60; vfmax = 60;
1207                 dclkmin = 0; dclkmax = 25000000;
1208         } else {
1209                 hfmin = info->monspecs.hfmin;
1210                 hfmax = info->monspecs.hfmax;
1211                 vfmin = info->monspecs.vfmin;
1212                 vfmax = info->monspecs.vfmax;
1213                 dclkmin = info->monspecs.dclkmin;
1214                 dclkmax = info->monspecs.dclkmax;
1215         }
1216
1217         timings->hactive = var->xres;
1218         timings->vactive = var->yres;
1219         if (var->vmode & FB_VMODE_INTERLACED) {
1220                 timings->vactive /= 2;
1221                 interlace = 2;
1222         }
1223         if (var->vmode & FB_VMODE_DOUBLE) {
1224                 timings->vactive *= 2;
1225                 dscan = 2;
1226         }
1227
1228         switch (flags & ~FB_IGNOREMON) {
1229         case FB_MAXTIMINGS: /* maximize refresh rate */
1230                 timings->hfreq = hfmax;
1231                 fb_timings_hfreq(timings);
1232                 if (timings->vfreq > vfmax) {
1233                         timings->vfreq = vfmax;
1234                         fb_timings_vfreq(timings);
1235                 }
1236                 if (timings->dclk > dclkmax) {
1237                         timings->dclk = dclkmax;
1238                         fb_timings_dclk(timings);
1239                 }
1240                 break;
1241         case FB_VSYNCTIMINGS: /* vrefresh driven */
1242                 timings->vfreq = val;
1243                 fb_timings_vfreq(timings);
1244                 break;
1245         case FB_HSYNCTIMINGS: /* hsync driven */
1246                 timings->hfreq = val;
1247                 fb_timings_hfreq(timings);
1248                 break;
1249         case FB_DCLKTIMINGS: /* pixelclock driven */
1250                 timings->dclk = PICOS2KHZ(val) * 1000;
1251                 fb_timings_dclk(timings);
1252                 break;
1253         default:
1254                 err = -EINVAL;
1255
1256         }
1257
1258         if (err || (!(flags & FB_IGNOREMON) &&
1259             (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1260              timings->hfreq < hfmin || timings->hfreq > hfmax ||
1261              timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1262                 err = -EINVAL;
1263         } else {
1264                 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1265                 var->hsync_len = (timings->htotal * 8)/100;
1266                 var->right_margin = (timings->hblank/2) - var->hsync_len;
1267                 var->left_margin = timings->hblank - var->right_margin -
1268                         var->hsync_len;
1269                 var->vsync_len = (3 * interlace)/dscan;
1270                 var->lower_margin = (1 * interlace)/dscan;
1271                 var->upper_margin = (timings->vblank * interlace)/dscan -
1272                         (var->vsync_len + var->lower_margin);
1273         }
1274
1275         kfree(timings);
1276         return err;
1277 }
1278 #else
1279 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1280 {
1281         return 1;
1282 }
1283 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1284 {
1285         specs = NULL;
1286 }
1287 void fb_destroy_modedb(struct fb_videomode *modedb)
1288 {
1289 }
1290 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1291                 struct fb_info *info)
1292 {
1293         return -EINVAL;
1294 }
1295 #endif /* CONFIG_FB_MODE_HELPERS */
1296
1297 /*
1298  * fb_validate_mode - validates var against monitor capabilities
1299  * @var: pointer to fb_var_screeninfo
1300  * @info: pointer to fb_info
1301  *
1302  * DESCRIPTION:
1303  * Validates video mode against monitor capabilities specified in
1304  * info->monspecs.
1305  *
1306  * REQUIRES:
1307  * A valid info->monspecs.
1308  */
1309 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1310 {
1311         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1312         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1313
1314         /*
1315          * If monspecs are invalid, use values that are enough
1316          * for 640x480@60
1317          */
1318         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1319             !info->monspecs.dclkmax ||
1320             info->monspecs.hfmax < info->monspecs.hfmin ||
1321             info->monspecs.vfmax < info->monspecs.vfmin ||
1322             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1323                 hfmin = 29000; hfmax = 30000;
1324                 vfmin = 60; vfmax = 60;
1325                 dclkmin = 0; dclkmax = 25000000;
1326         } else {
1327                 hfmin = info->monspecs.hfmin;
1328                 hfmax = info->monspecs.hfmax;
1329                 vfmin = info->monspecs.vfmin;
1330                 vfmax = info->monspecs.vfmax;
1331                 dclkmin = info->monspecs.dclkmin;
1332                 dclkmax = info->monspecs.dclkmax;
1333         }
1334
1335         if (!var->pixclock)
1336                 return -EINVAL;
1337         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1338
1339         htotal = var->xres + var->right_margin + var->hsync_len +
1340                 var->left_margin;
1341         vtotal = var->yres + var->lower_margin + var->vsync_len +
1342                 var->upper_margin;
1343
1344         if (var->vmode & FB_VMODE_INTERLACED)
1345                 vtotal /= 2;
1346         if (var->vmode & FB_VMODE_DOUBLE)
1347                 vtotal *= 2;
1348
1349         hfreq = pixclock/htotal;
1350         hfreq = (hfreq + 500) / 1000 * 1000;
1351
1352         vfreq = hfreq/vtotal;
1353
1354         return (vfreq < vfmin || vfreq > vfmax ||
1355                 hfreq < hfmin || hfreq > hfmax ||
1356                 pixclock < dclkmin || pixclock > dclkmax) ?
1357                 -EINVAL : 0;
1358 }
1359
1360 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1361
1362 /*
1363  * We need to ensure that the EDID block is only returned for
1364  * the primary graphics adapter.
1365  */
1366
1367 const unsigned char *fb_firmware_edid(struct device *device)
1368 {
1369         struct pci_dev *dev = NULL;
1370         struct resource *res = NULL;
1371         unsigned char *edid = NULL;
1372
1373         if (device)
1374                 dev = to_pci_dev(device);
1375
1376         if (dev)
1377                 res = &dev->resource[PCI_ROM_RESOURCE];
1378
1379         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1380                 edid = edid_info.dummy;
1381
1382         return edid;
1383 }
1384 #else
1385 const unsigned char *fb_firmware_edid(struct device *device)
1386 {
1387         return NULL;
1388 }
1389 #endif
1390 EXPORT_SYMBOL(fb_firmware_edid);
1391
1392 EXPORT_SYMBOL(fb_parse_edid);
1393 EXPORT_SYMBOL(fb_edid_to_monspecs);
1394 EXPORT_SYMBOL(fb_get_mode);
1395 EXPORT_SYMBOL(fb_validate_mode);
1396 EXPORT_SYMBOL(fb_destroy_modedb);