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/tty.h>
  30 #include <linux/fb.h>
  31 #include <linux/module.h>
  32 #include <video/edid.h>
  33 #ifdef CONFIG_PPC_OF
  34 #include <linux/pci.h>
  35 #include <asm/prom.h>
  36 #include <asm/pci-bridge.h>
  37 #endif
  38 #include "edid.h"
  39
  40 /*
  41  * EDID parser
  42  */
  43
  44 #undef DEBUG  /* define this for verbose EDID parsing output */
  45
  46 #ifdef DEBUG
  47 #define DPRINTK(fmt, args...) printk(fmt,## args)
  48 #else
  49 #define DPRINTK(fmt, args...)
  50 #endif
  51
  52 #define FBMON_FIX_HEADER 1
  53 #define FBMON_FIX_INPUT  2
  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 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 };
  76
  77 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
  78         0xff, 0xff, 0xff, 0x00
  79 };
  80
  81 static void copy_string(unsigned char *c, unsigned char *s)
  82 {
  83   int i;
  84   c = c + 5;
  85   for (i = 0; (i < 13 && *c != 0x0A); i++)
  86     *(s++) = *(c++);
  87   *s = 0;
  88   while (i-- && (*--s == 0x20)) *s = 0;
  89 }
  90
  91 static int check_edid(unsigned char *edid)
  92 {
  93         unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
  94         unsigned char *b;
  95         u32 model;
  96         int i, fix = 0, ret = 0;
  97
  98         manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
  99         manufacturer[1] = ((block[0] & 0x03) << 3) +
 100                 ((block[1] & 0xe0) >> 5) + '@';
 101         manufacturer[2] = (block[1] & 0x1f) + '@';
 102         manufacturer[3] = 0;
 103         model = block[2] + (block[3] << 8);
 104
 105         for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
 106                 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
 107                         brokendb[i].model == model) {
 108                         printk("fbmon: The EDID Block of "
 109                                "Manufacturer: %s Model: 0x%x is known to "
 110                                "be broken,\n",  manufacturer, model);
 111                         fix = brokendb[i].fix;
 112                         break;
 113                 }
 114         }
 115
 116         switch (fix) {
 117         case FBMON_FIX_HEADER:
 118                 for (i = 0; i < 8; i++) {
 119                         if (edid[i] != edid_v1_header[i])
 120                                 ret = fix;
 121                 }
 122                 break;
 123         case FBMON_FIX_INPUT:
 124                 b = edid + EDID_STRUCT_DISPLAY;
 125                 /* Only if display is GTF capable will
 126                    the input type be reset to analog */
 127                 if (b[4] & 0x01 && b[0] & 0x80)
 128                         ret = fix;
 129                 break;
 130         }
 131
 132         return ret;
 133 }
 134
 135 static void fix_edid(unsigned char *edid, int fix)
 136 {
 137         unsigned char *b;
 138
 139         switch (fix) {
 140         case FBMON_FIX_HEADER:
 141                 printk("fbmon: trying a header reconstruct\n");
 142                 memcpy(edid, edid_v1_header, 8);
 143                 break;
 144         case FBMON_FIX_INPUT:
 145                 printk("fbmon: trying to fix input type\n");
 146                 b = edid + EDID_STRUCT_DISPLAY;
 147                 b[0] &= ~0x80;
 148                 edid[127] += 0x80;
 149         }
 150 }
 151
 152 static int edid_checksum(unsigned char *edid)
 153 {
 154         unsigned char i, csum = 0, all_null = 0;
 155         int err = 0, fix = check_edid(edid);
 156
 157         if (fix)
 158                 fix_edid(edid, fix);
 159
 160         for (i = 0; i < EDID_LENGTH; i++) {
 161                 csum += edid[i];
 162                 all_null |= edid[i];
 163         }
 164
 165         if (csum == 0x00 && all_null) {
 166                 /* checksum passed, everything's good */
 167                 err = 1;
 168         }
 169
 170         return err;
 171 }
 172
 173 static int edid_check_header(unsigned char *edid)
 174 {
 175         int i, err = 1, fix = check_edid(edid);
 176
 177         if (fix)
 178                 fix_edid(edid, fix);
 179
 180         for (i = 0; i < 8; i++) {
 181                 if (edid[i] != edid_v1_header[i])
 182                         err = 0;
 183         }
 184
 185         return err;
 186 }
 187
 188 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
 189 {
 190         specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 191         specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
 192                 ((block[1] & 0xe0) >> 5) + '@';
 193         specs->manufacturer[2] = (block[1] & 0x1f) + '@';
 194         specs->manufacturer[3] = 0;
 195         specs->model = block[2] + (block[3] << 8);
 196         specs->serial = block[4] + (block[5] << 8) +
 197                (block[6] << 16) + (block[7] << 24);
 198         specs->year = block[9] + 1990;
 199         specs->week = block[8];
 200         DPRINTK("   Manufacturer: %s\n", specs->manufacturer);
 201         DPRINTK("   Model: %x\n", specs->model);
 202         DPRINTK("   Serial#: %u\n", specs->serial);
 203         DPRINTK("   Year: %u Week %u\n", specs->year, specs->week);
 204 }
 205
 206 static void get_dpms_capabilities(unsigned char flags,
 207                                   struct fb_monspecs *specs)
 208 {
 209         specs->dpms = 0;
 210         if (flags & DPMS_ACTIVE_OFF)
 211                 specs->dpms |= FB_DPMS_ACTIVE_OFF;
 212         if (flags & DPMS_SUSPEND)
 213                 specs->dpms |= FB_DPMS_SUSPEND;
 214         if (flags & DPMS_STANDBY)
 215                 specs->dpms |= FB_DPMS_STANDBY;
 216         DPRINTK("      DPMS: Active %s, Suspend %s, Standby %s\n",
 217                (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
 218                (flags & DPMS_SUSPEND)    ? "yes" : "no",
 219                (flags & DPMS_STANDBY)    ? "yes" : "no");
 220 }
 221
 222 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
 223 {
 224         int tmp;
 225
 226         DPRINTK("      Chroma\n");
 227         /* Chromaticity data */
 228         tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
 229         tmp *= 1000;
 230         tmp += 512;
 231         specs->chroma.redx = tmp/1024;
 232         DPRINTK("         RedX:     0.%03d ", specs->chroma.redx);
 233
 234         tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
 235         tmp *= 1000;
 236         tmp += 512;
 237         specs->chroma.redy = tmp/1024;
 238         DPRINTK("RedY:     0.%03d\n", specs->chroma.redy);
 239
 240         tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
 241         tmp *= 1000;
 242         tmp += 512;
 243         specs->chroma.greenx = tmp/1024;
 244         DPRINTK("         GreenX:   0.%03d ", specs->chroma.greenx);
 245
 246         tmp = (block[5] & 3) | (block[0xa] << 2);
 247         tmp *= 1000;
 248         tmp += 512;
 249         specs->chroma.greeny = tmp/1024;
 250         DPRINTK("GreenY:   0.%03d\n", specs->chroma.greeny);
 251
 252         tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
 253         tmp *= 1000;
 254         tmp += 512;
 255         specs->chroma.bluex = tmp/1024;
 256         DPRINTK("         BlueX:    0.%03d ", specs->chroma.bluex);
 257
 258         tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
 259         tmp *= 1000;
 260         tmp += 512;
 261         specs->chroma.bluey = tmp/1024;
 262         DPRINTK("BlueY:    0.%03d\n", specs->chroma.bluey);
 263
 264         tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
 265         tmp *= 1000;
 266         tmp += 512;
 267         specs->chroma.whitex = tmp/1024;
 268         DPRINTK("         WhiteX:   0.%03d ", specs->chroma.whitex);
 269
 270         tmp = (block[6] & 3) | (block[0xe] << 2);
 271         tmp *= 1000;
 272         tmp += 512;
 273         specs->chroma.whitey = tmp/1024;
 274         DPRINTK("WhiteY:   0.%03d\n", specs->chroma.whitey);
 275 }
 276
 277 static int edid_is_serial_block(unsigned char *block)
 278 {
 279         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 280             (block[2] == 0x00) && (block[3] == 0xff) &&
 281             (block[4] == 0x00))
 282                 return 1;
 283         else
 284                 return 0;
 285 }
 286
 287 static int edid_is_ascii_block(unsigned char *block)
 288 {
 289         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 290             (block[2] == 0x00) && (block[3] == 0xfe) &&
 291             (block[4] == 0x00))
 292                 return 1;
 293         else
 294                 return 0;
 295 }
 296
 297 static int edid_is_limits_block(unsigned char *block)
 298 {
 299         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 300             (block[2] == 0x00) && (block[3] == 0xfd) &&
 301             (block[4] == 0x00))
 302                 return 1;
 303         else
 304                 return 0;
 305 }
 306
 307 static int edid_is_monitor_block(unsigned char *block)
 308 {
 309         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 310             (block[2] == 0x00) && (block[3] == 0xfc) &&
 311             (block[4] == 0x00))
 312                 return 1;
 313         else
 314                 return 0;
 315 }
 316
 317 static void calc_mode_timings(int xres, int yres, int refresh,
 318                               struct fb_videomode *mode)
 319 {
 320         struct fb_var_screeninfo var;
 321         struct fb_info info;
 322
 323         memset(&var, 0, sizeof(struct fb_var_screeninfo));
 324         var.xres = xres;
 325         var.yres = yres;
 326         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
 327                     refresh, &var, &info);
 328         mode->xres = xres;
 329         mode->yres = yres;
 330         mode->pixclock = var.pixclock;
 331         mode->refresh = refresh;
 332         mode->left_margin = var.left_margin;
 333         mode->right_margin = var.right_margin;
 334         mode->upper_margin = var.upper_margin;
 335         mode->lower_margin = var.lower_margin;
 336         mode->hsync_len = var.hsync_len;
 337         mode->vsync_len = var.vsync_len;
 338         mode->vmode = 0;
 339         mode->sync = 0;
 340 }
 341
 342 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
 343 {
 344         int num = 0;
 345         unsigned char c;
 346
 347         c = block[0];
 348         if (c&0x80) {
 349                 calc_mode_timings(720, 400, 70, &mode[num]);
 350                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 351                 DPRINTK("      720x400@70Hz\n");
 352         }
 353         if (c&0x40) {
 354                 calc_mode_timings(720, 400, 88, &mode[num]);
 355                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 356                 DPRINTK("      720x400@88Hz\n");
 357         }
 358         if (c&0x20) {
 359                 mode[num++] = vesa_modes[3];
 360                 DPRINTK("      640x480@60Hz\n");
 361         }
 362         if (c&0x10) {
 363                 calc_mode_timings(640, 480, 67, &mode[num]);
 364                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 365                 DPRINTK("      640x480@67Hz\n");
 366         }
 367         if (c&0x08) {
 368                 mode[num++] = vesa_modes[4];
 369                 DPRINTK("      640x480@72Hz\n");
 370         }
 371         if (c&0x04) {
 372                 mode[num++] = vesa_modes[5];
 373                 DPRINTK("      640x480@75Hz\n");
 374         }
 375         if (c&0x02) {
 376                 mode[num++] = vesa_modes[7];
 377                 DPRINTK("      800x600@56Hz\n");
 378         }
 379         if (c&0x01) {
 380                 mode[num++] = vesa_modes[8];
 381                 DPRINTK("      800x600@60Hz\n");
 382         }
 383
 384         c = block[1];
 385         if (c&0x80) {
 386                 mode[num++] = vesa_modes[9];
 387                 DPRINTK("      800x600@72Hz\n");
 388         }
 389         if (c&0x40) {
 390                 mode[num++] = vesa_modes[10];
 391                 DPRINTK("      800x600@75Hz\n");
 392         }
 393         if (c&0x20) {
 394                 calc_mode_timings(832, 624, 75, &mode[num]);
 395                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 396                 DPRINTK("      832x624@75Hz\n");
 397         }
 398         if (c&0x10) {
 399                 mode[num++] = vesa_modes[12];
 400                 DPRINTK("      1024x768@87Hz Interlaced\n");
 401         }
 402         if (c&0x08) {
 403                 mode[num++] = vesa_modes[13];
 404                 DPRINTK("      1024x768@60Hz\n");
 405         }
 406         if (c&0x04) {
 407                 mode[num++] = vesa_modes[14];
 408                 DPRINTK("      1024x768@70Hz\n");
 409         }
 410         if (c&0x02) {
 411                 mode[num++] = vesa_modes[15];
 412                 DPRINTK("      1024x768@75Hz\n");
 413         }
 414         if (c&0x01) {
 415                 mode[num++] = vesa_modes[21];
 416                 DPRINTK("      1280x1024@75Hz\n");
 417         }
 418         c = block[2];
 419         if (c&0x80) {
 420                 mode[num++] = vesa_modes[17];
 421                 DPRINTK("      1152x870@75Hz\n");
 422         }
 423         DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
 424         return num;
 425 }
 426
 427 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
 428 {
 429         int xres, yres = 0, refresh, ratio, i;
 430
 431         xres = (block[0] + 31) * 8;
 432         if (xres <= 256)
 433                 return 0;
 434
 435         ratio = (block[1] & 0xc0) >> 6;
 436         switch (ratio) {
 437         case 0:
 438                 yres = xres;
 439                 break;
 440         case 1:
 441                 yres = (xres * 3)/4;
 442                 break;
 443         case 2:
 444                 yres = (xres * 4)/5;
 445                 break;
 446         case 3:
 447                 yres = (xres * 9)/16;
 448                 break;
 449         }
 450         refresh = (block[1] & 0x3f) + 60;
 451
 452         DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 453         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 454                 if (vesa_modes[i].xres == xres &&
 455                     vesa_modes[i].yres == yres &&
 456                     vesa_modes[i].refresh == refresh) {
 457                         *mode = vesa_modes[i];
 458                         mode->flag |= FB_MODE_IS_STANDARD;
 459                         return 1;
 460                 }
 461         }
 462         calc_mode_timings(xres, yres, refresh, mode);
 463         return 1;
 464 }
 465
 466 static int get_dst_timing(unsigned char *block,
 467                           struct fb_videomode *mode)
 468 {
 469         int j, num = 0;
 470
 471         for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
 472                 num += get_std_timing(block, &mode[num]);
 473
 474         return num;
 475 }
 476
 477 static void get_detailed_timing(unsigned char *block,
 478                                 struct fb_videomode *mode)
 479 {
 480         mode->xres = H_ACTIVE;
 481         mode->yres = V_ACTIVE;
 482         mode->pixclock = PIXEL_CLOCK;
 483         mode->pixclock /= 1000;
 484         mode->pixclock = KHZ2PICOS(mode->pixclock);
 485         mode->right_margin = H_SYNC_OFFSET;
 486         mode->left_margin = (H_ACTIVE + H_BLANKING) -
 487                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 488         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 489                 V_SYNC_WIDTH;
 490         mode->lower_margin = V_SYNC_OFFSET;
 491         mode->hsync_len = H_SYNC_WIDTH;
 492         mode->vsync_len = V_SYNC_WIDTH;
 493         if (HSYNC_POSITIVE)
 494                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 495         if (VSYNC_POSITIVE)
 496                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 497         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 498                                      (V_ACTIVE + V_BLANKING));
 499         mode->vmode = 0;
 500         mode->flag = FB_MODE_IS_DETAILED;
 501
 502         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 503         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 504                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 505         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 506                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 507         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 508                (VSYNC_POSITIVE) ? "+" : "-");
 509 }
 510
 511 /**
 512  * fb_create_modedb - create video mode database
 513  * @edid: EDID data
 514  * @dbsize: database size
 515  *
 516  * RETURNS: struct fb_videomode, @dbsize contains length of database
 517  *
 518  * DESCRIPTION:
 519  * This function builds a mode database using the contents of the EDID
 520  * data
 521  */
 522 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 523 {
 524         struct fb_videomode *mode, *m;
 525         unsigned char *block;
 526         int num = 0, i;
 527
 528         mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 529         if (mode == NULL)
 530                 return NULL;
 531         memset(mode, 0, 50 * sizeof(struct fb_videomode));
 532
 533         if (edid == NULL || !edid_checksum(edid) ||
 534             !edid_check_header(edid)) {
 535                 kfree(mode);
 536                 return NULL;
 537         }
 538
 539         *dbsize = 0;
 540
 541         DPRINTK("   Detailed Timings\n");
 542         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 543         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 544                 int first = 1;
 545
 546                 if (!(block[0] == 0x00 && block[1] == 0x00)) {
 547                         get_detailed_timing(block, &mode[num]);
 548                         if (first) {
 549                                 mode[num].flag |= FB_MODE_IS_FIRST;
 550                                 first = 0;
 551                         }
 552                         num++;
 553                 }
 554         }
 555
 556         DPRINTK("   Supported VESA Modes\n");
 557         block = edid + ESTABLISHED_TIMING_1;
 558         num += get_est_timing(block, &mode[num]);
 559
 560         DPRINTK("   Standard Timings\n");
 561         block = edid + STD_TIMING_DESCRIPTIONS_START;
 562         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 563                 num += get_std_timing(block, &mode[num]);
 564
 565         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 566         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 567                 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 568                         num += get_dst_timing(block + 5, &mode[num]);
 569         }
 570
 571         /* Yikes, EDID data is totally useless */
 572         if (!num) {
 573                 kfree(mode);
 574                 return NULL;
 575         }
 576
 577         *dbsize = num;
 578         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 579         if (!m)
 580                 return mode;
 581         memmove(m, mode, num * sizeof(struct fb_videomode));
 582         kfree(mode);
 583         return m;
 584 }
 585
 586 /**
 587  * fb_destroy_modedb - destroys mode database
 588  * @modedb: mode database to destroy
 589  *
 590  * DESCRIPTION:
 591  * Destroy mode database created by fb_create_modedb
 592  */
 593 void fb_destroy_modedb(struct fb_videomode *modedb)
 594 {
 595         kfree(modedb);
 596 }
 597
 598 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 599 {
 600         int i, retval = 1;
 601         unsigned char *block;
 602
 603         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 604
 605         DPRINTK("      Monitor Operating Limits: ");
 606         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 607                 if (edid_is_limits_block(block)) {
 608                         specs->hfmin = H_MIN_RATE * 1000;
 609                         specs->hfmax = H_MAX_RATE * 1000;
 610                         specs->vfmin = V_MIN_RATE;
 611                         specs->vfmax = V_MAX_RATE;
 612                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 613                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 614                         retval = 0;
 615                         DPRINTK("From EDID\n");
 616                         break;
 617                 }
 618         }
 619
 620         /* estimate monitor limits based on modes supported */
 621         if (retval) {
 622                 struct fb_videomode *modes;
 623                 int num_modes, i, hz, hscan, pixclock;
 624
 625                 modes = fb_create_modedb(edid, &num_modes);
 626                 if (!modes) {
 627                         DPRINTK("None Available\n");
 628                         return 1;
 629                 }
 630
 631                 retval = 0;
 632                 for (i = 0; i < num_modes; i++) {
 633                         hz = modes[i].refresh;
 634                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 635                         hscan = (modes[i].yres * 105 * hz + 5000)/100;
 636
 637                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 638                                 specs->dclkmax = pixclock;
 639                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 640                                 specs->dclkmin = pixclock;
 641                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 642                                 specs->hfmax = hscan;
 643                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 644                                 specs->hfmin = hscan;
 645                         if (specs->vfmax == 0 || specs->vfmax < hz)
 646                                 specs->vfmax = hz;
 647                         if (specs->vfmin == 0 || specs->vfmin > hz)
 648                                 specs->vfmin = hz;
 649                 }
 650                 DPRINTK("Extrapolated\n");
 651                 fb_destroy_modedb(modes);
 652         }
 653         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 654                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 655                 specs->vfmax, specs->dclkmax/1000000);
 656         return retval;
 657 }
 658
 659 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 660 {
 661         unsigned char c, *block;
 662
 663         block = edid + EDID_STRUCT_DISPLAY;
 664
 665         fb_get_monitor_limits(edid, specs);
 666
 667         c = block[0] & 0x80;
 668         specs->input = 0;
 669         if (c) {
 670                 specs->input |= FB_DISP_DDI;
 671                 DPRINTK("      Digital Display Input");
 672         } else {
 673                 DPRINTK("      Analog Display Input: Input Voltage - ");
 674                 switch ((block[0] & 0x60) >> 5) {
 675                 case 0:
 676                         DPRINTK("0.700V/0.300V");
 677                         specs->input |= FB_DISP_ANA_700_300;
 678                         break;
 679                 case 1:
 680                         DPRINTK("0.714V/0.286V");
 681                         specs->input |= FB_DISP_ANA_714_286;
 682                         break;
 683                 case 2:
 684                         DPRINTK("1.000V/0.400V");
 685                         specs->input |= FB_DISP_ANA_1000_400;
 686                         break;
 687                 case 3:
 688                         DPRINTK("0.700V/0.000V");
 689                         specs->input |= FB_DISP_ANA_700_000;
 690                         break;
 691                 }
 692         }
 693         DPRINTK("\n      Sync: ");
 694         c = block[0] & 0x10;
 695         if (c)
 696                 DPRINTK("      Configurable signal level\n");
 697         c = block[0] & 0x0f;
 698         specs->signal = 0;
 699         if (c & 0x10) {
 700                 DPRINTK("Blank to Blank ");
 701                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 702         }
 703         if (c & 0x08) {
 704                 DPRINTK("Separate ");
 705                 specs->signal |= FB_SIGNAL_SEPARATE;
 706         }
 707         if (c & 0x04) {
 708                 DPRINTK("Composite ");
 709                 specs->signal |= FB_SIGNAL_COMPOSITE;
 710         }
 711         if (c & 0x02) {
 712                 DPRINTK("Sync on Green ");
 713                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 714         }
 715         if (c & 0x01) {
 716                 DPRINTK("Serration on ");
 717                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 718         }
 719         DPRINTK("\n");
 720         specs->max_x = block[1];
 721         specs->max_y = block[2];
 722         DPRINTK("      Max H-size in cm: ");
 723         if (specs->max_x)
 724                 DPRINTK("%d\n", specs->max_x);
 725         else
 726                 DPRINTK("variable\n");
 727         DPRINTK("      Max V-size in cm: ");
 728         if (specs->max_y)
 729                 DPRINTK("%d\n", specs->max_y);
 730         else
 731                 DPRINTK("variable\n");
 732
 733         c = block[3];
 734         specs->gamma = c+100;
 735         DPRINTK("      Gamma: ");
 736         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 737
 738         get_dpms_capabilities(block[4], specs);
 739
 740         switch ((block[4] & 0x18) >> 3) {
 741         case 0:
 742                 DPRINTK("      Monochrome/Grayscale\n");
 743                 specs->input |= FB_DISP_MONO;
 744                 break;
 745         case 1:
 746                 DPRINTK("      RGB Color Display\n");
 747                 specs->input |= FB_DISP_RGB;
 748                 break;
 749         case 2:
 750                 DPRINTK("      Non-RGB Multicolor Display\n");
 751                 specs->input |= FB_DISP_MULTI;
 752                 break;
 753         default:
 754                 DPRINTK("      Unknown\n");
 755                 specs->input |= FB_DISP_UNKNOWN;
 756                 break;
 757         }
 758
 759         get_chroma(block, specs);
 760
 761         specs->misc = 0;
 762         c = block[4] & 0x7;
 763         if (c & 0x04) {
 764                 DPRINTK("      Default color format is primary\n");
 765                 specs->misc |= FB_MISC_PRIM_COLOR;
 766         }
 767         if (c & 0x02) {
 768                 DPRINTK("      First DETAILED Timing is preferred\n");
 769                 specs->misc |= FB_MISC_1ST_DETAIL;
 770         }
 771         if (c & 0x01) {
 772                 printk("      Display is GTF capable\n");
 773                 specs->gtf = 1;
 774         }
 775 }
 776
 777 static int edid_is_timing_block(unsigned char *block)
 778 {
 779         if ((block[0] != 0x00) || (block[1] != 0x00) ||
 780             (block[2] != 0x00) || (block[4] != 0x00))
 781                 return 1;
 782         else
 783                 return 0;
 784 }
 785
 786 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 787 {
 788         int i;
 789         unsigned char *block;
 790
 791         if (edid == NULL || var == NULL)
 792                 return 1;
 793
 794         if (!(edid_checksum(edid)))
 795                 return 1;
 796
 797         if (!(edid_check_header(edid)))
 798                 return 1;
 799
 800         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 801
 802         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 803                 if (edid_is_timing_block(block)) {
 804                         var->xres = var->xres_virtual = H_ACTIVE;
 805                         var->yres = var->yres_virtual = V_ACTIVE;
 806                         var->height = var->width = -1;
 807                         var->right_margin = H_SYNC_OFFSET;
 808                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 809                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 810                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 811                                 V_SYNC_WIDTH;
 812                         var->lower_margin = V_SYNC_OFFSET;
 813                         var->hsync_len = H_SYNC_WIDTH;
 814                         var->vsync_len = V_SYNC_WIDTH;
 815                         var->pixclock = PIXEL_CLOCK;
 816                         var->pixclock /= 1000;
 817                         var->pixclock = KHZ2PICOS(var->pixclock);
 818
 819                         if (HSYNC_POSITIVE)
 820                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 821                         if (VSYNC_POSITIVE)
 822                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 823                         return 0;
 824                 }
 825         }
 826         return 1;
 827 }
 828
 829 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 830 {
 831         unsigned char *block;
 832         int i, found = 0;
 833
 834         if (edid == NULL)
 835                 return;
 836
 837         if (!(edid_checksum(edid)))
 838                 return;
 839
 840         if (!(edid_check_header(edid)))
 841                 return;
 842
 843         memset(specs, 0, sizeof(struct fb_monspecs));
 844
 845         specs->version = edid[EDID_STRUCT_VERSION];
 846         specs->revision = edid[EDID_STRUCT_REVISION];
 847
 848         DPRINTK("========================================\n");
 849         DPRINTK("Display Information (EDID)\n");
 850         DPRINTK("========================================\n");
 851         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 852                (int) specs->revision);
 853
 854         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 855
 856         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 857         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 858                 if (edid_is_serial_block(block)) {
 859                         copy_string(block, specs->serial_no);
 860                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 861                 } else if (edid_is_ascii_block(block)) {
 862                         copy_string(block, specs->ascii);
 863                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 864                 } else if (edid_is_monitor_block(block)) {
 865                         copy_string(block, specs->monitor);
 866                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 867                 }
 868         }
 869
 870         DPRINTK("   Display Characteristics:\n");
 871         get_monspecs(edid, specs);
 872
 873         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 874
 875         /*
 876          * Workaround for buggy EDIDs that sets that the first
 877          * detailed timing is preferred but has not detailed
 878          * timing specified
 879          */
 880         for (i = 0; i < specs->modedb_len; i++) {
 881                 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 882                         found = 1;
 883                         break;
 884                 }
 885         }
 886
 887         if (!found)
 888                 specs->misc &= ~FB_MISC_1ST_DETAIL;
 889
 890         DPRINTK("========================================\n");
 891 }
 892
 893 /*
 894  * VESA Generalized Timing Formula (GTF)
 895  */
 896
 897 #define FLYBACK                     550
 898 #define V_FRONTPORCH                1
 899 #define H_OFFSET                    40
 900 #define H_SCALEFACTOR               20
 901 #define H_BLANKSCALE                128
 902 #define H_GRADIENT                  600
 903 #define C_VAL                       30
 904 #define M_VAL                       300
 905
 906 struct __fb_timings {
 907         u32 dclk;
 908         u32 hfreq;
 909         u32 vfreq;
 910         u32 hactive;
 911         u32 vactive;
 912         u32 hblank;
 913         u32 vblank;
 914         u32 htotal;
 915         u32 vtotal;
 916 };
 917
 918 /**
 919  * fb_get_vblank - get vertical blank time
 920  * @hfreq: horizontal freq
 921  *
 922  * DESCRIPTION:
 923  * vblank = right_margin + vsync_len + left_margin
 924  *
 925  *    given: right_margin = 1 (V_FRONTPORCH)
 926  *           vsync_len    = 3
 927  *           flyback      = 550
 928  *
 929  *                          flyback * hfreq
 930  *           left_margin  = --------------- - vsync_len
 931  *                           1000000
 932  */
 933 static u32 fb_get_vblank(u32 hfreq)
 934 {
 935         u32 vblank;
 936
 937         vblank = (hfreq * FLYBACK)/1000;
 938         vblank = (vblank + 500)/1000;
 939         return (vblank + V_FRONTPORCH);
 940 }
 941
 942 /**
 943  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
 944  * @hfreq: horizontal freq
 945  * @xres: horizontal resolution in pixels
 946  *
 947  * DESCRIPTION:
 948  *
 949  *           xres * duty_cycle
 950  * hblank = ------------------
 951  *           100 - duty_cycle
 952  *
 953  * duty cycle = percent of htotal assigned to inactive display
 954  * duty cycle = C - (M/Hfreq)
 955  *
 956  * where: C = ((offset - scale factor) * blank_scale)
 957  *            -------------------------------------- + scale factor
 958  *                        256
 959  *        M = blank_scale * gradient
 960  *
 961  */
 962 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
 963 {
 964         u32 c_val, m_val, duty_cycle, hblank;
 965
 966         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
 967                  H_SCALEFACTOR) * 1000;
 968         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
 969         m_val = (m_val * 1000000)/hfreq;
 970         duty_cycle = c_val - m_val;
 971         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
 972         return (hblank);
 973 }
 974
 975 /**
 976  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
 977  * @dclk: pixelclock in Hz
 978  * @xres: horizontal resolution in pixels
 979  *
 980  * DESCRIPTION:
 981  *
 982  *           xres * duty_cycle
 983  * hblank = ------------------
 984  *           100 - duty_cycle
 985  *
 986  * duty cycle = percent of htotal assigned to inactive display
 987  * duty cycle = C - (M * h_period)
 988  *
 989  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
 990  *                   -----------------------------------------------
 991  *                                    2 * M
 992  *        M = 300;
 993  *        C = 30;
 994
 995  */
 996 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
 997 {
 998         u32 duty_cycle, h_period, hblank;
 999
1000         dclk /= 1000;
1001         h_period = 100 - C_VAL;
1002         h_period *= h_period;
1003         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1004         h_period *=10000;
1005
1006         h_period = int_sqrt(h_period);
1007         h_period -= (100 - C_VAL) * 100;
1008         h_period *= 1000;
1009         h_period /= 2 * M_VAL;
1010
1011         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1012         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1013         hblank &= ~15;
1014         return (hblank);
1015 }
1016
1017 /**
1018  * fb_get_hfreq - estimate hsync
1019  * @vfreq: vertical refresh rate
1020  * @yres: vertical resolution
1021  *
1022  * DESCRIPTION:
1023  *
1024  *          (yres + front_port) * vfreq * 1000000
1025  * hfreq = -------------------------------------
1026  *          (1000000 - (vfreq * FLYBACK)
1027  *
1028  */
1029
1030 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1031 {
1032         u32 divisor, hfreq;
1033
1034         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1035         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1036         return (hfreq/divisor);
1037 }
1038
1039 static void fb_timings_vfreq(struct __fb_timings *timings)
1040 {
1041         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1042         timings->vblank = fb_get_vblank(timings->hfreq);
1043         timings->vtotal = timings->vactive + timings->vblank;
1044         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1045                                                  timings->hactive);
1046         timings->htotal = timings->hactive + timings->hblank;
1047         timings->dclk = timings->htotal * timings->hfreq;
1048 }
1049
1050 static void fb_timings_hfreq(struct __fb_timings *timings)
1051 {
1052         timings->vblank = fb_get_vblank(timings->hfreq);
1053         timings->vtotal = timings->vactive + timings->vblank;
1054         timings->vfreq = timings->hfreq/timings->vtotal;
1055         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1056                                                  timings->hactive);
1057         timings->htotal = timings->hactive + timings->hblank;
1058         timings->dclk = timings->htotal * timings->hfreq;
1059 }
1060
1061 static void fb_timings_dclk(struct __fb_timings *timings)
1062 {
1063         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1064                                                 timings->hactive);
1065         timings->htotal = timings->hactive + timings->hblank;
1066         timings->hfreq = timings->dclk/timings->htotal;
1067         timings->vblank = fb_get_vblank(timings->hfreq);
1068         timings->vtotal = timings->vactive + timings->vblank;
1069         timings->vfreq = timings->hfreq/timings->vtotal;
1070 }
1071
1072 /*
1073  * fb_get_mode - calculates video mode using VESA GTF
1074  * @flags: if: 0 - maximize vertical refresh rate
1075  *             1 - vrefresh-driven calculation;
1076  *             2 - hscan-driven calculation;
1077  *             3 - pixelclock-driven calculation;
1078  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1079  * @var: pointer to fb_var_screeninfo
1080  * @info: pointer to fb_info
1081  *
1082  * DESCRIPTION:
1083  * Calculates video mode based on monitor specs using VESA GTF.
1084  * The GTF is best for VESA GTF compliant monitors but is
1085  * specifically formulated to work for older monitors as well.
1086  *
1087  * If @flag==0, the function will attempt to maximize the
1088  * refresh rate.  Otherwise, it will calculate timings based on
1089  * the flag and accompanying value.
1090  *
1091  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1092  * ignored and @var will be filled with the calculated timings.
1093  *
1094  * All calculations are based on the VESA GTF Spreadsheet
1095  * available at VESA's public ftp (http://www.vesa.org).
1096  *
1097  * NOTES:
1098  * The timings generated by the GTF will be different from VESA
1099  * DMT.  It might be a good idea to keep a table of standard
1100  * VESA modes as well.  The GTF may also not work for some displays,
1101  * such as, and especially, analog TV.
1102  *
1103  * REQUIRES:
1104  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1105  */
1106 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1107 {
1108         struct __fb_timings timings;
1109         u32 interlace = 1, dscan = 1;
1110         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1111
1112         /*
1113          * If monspecs are invalid, use values that are enough
1114          * for 640x480@60
1115          */
1116         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1117             !info->monspecs.dclkmax ||
1118             info->monspecs.hfmax < info->monspecs.hfmin ||
1119             info->monspecs.vfmax < info->monspecs.vfmin ||
1120             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1121                 hfmin = 29000; hfmax = 30000;
1122                 vfmin = 60; vfmax = 60;
1123                 dclkmin = 0; dclkmax = 25000000;
1124         } else {
1125                 hfmin = info->monspecs.hfmin;
1126                 hfmax = info->monspecs.hfmax;
1127                 vfmin = info->monspecs.vfmin;
1128                 vfmax = info->monspecs.vfmax;
1129                 dclkmin = info->monspecs.dclkmin;
1130                 dclkmax = info->monspecs.dclkmax;
1131         }
1132
1133         memset(&timings, 0, sizeof(struct __fb_timings));
1134         timings.hactive = var->xres;
1135         timings.vactive = var->yres;
1136         if (var->vmode & FB_VMODE_INTERLACED) {
1137                 timings.vactive /= 2;
1138                 interlace = 2;
1139         }
1140         if (var->vmode & FB_VMODE_DOUBLE) {
1141                 timings.vactive *= 2;
1142                 dscan = 2;
1143         }
1144
1145         switch (flags & ~FB_IGNOREMON) {
1146         case FB_MAXTIMINGS: /* maximize refresh rate */
1147                 timings.hfreq = hfmax;
1148                 fb_timings_hfreq(&timings);
1149                 if (timings.vfreq > vfmax) {
1150                         timings.vfreq = vfmax;
1151                         fb_timings_vfreq(&timings);
1152                 }
1153                 if (timings.dclk > dclkmax) {
1154                         timings.dclk = dclkmax;
1155                         fb_timings_dclk(&timings);
1156                 }
1157                 break;
1158         case FB_VSYNCTIMINGS: /* vrefresh driven */
1159                 timings.vfreq = val;
1160                 fb_timings_vfreq(&timings);
1161                 break;
1162         case FB_HSYNCTIMINGS: /* hsync driven */
1163                 timings.hfreq = val;
1164                 fb_timings_hfreq(&timings);
1165                 break;
1166         case FB_DCLKTIMINGS: /* pixelclock driven */
1167                 timings.dclk = PICOS2KHZ(val) * 1000;
1168                 fb_timings_dclk(&timings);
1169                 break;
1170         default:
1171                 return -EINVAL;
1172
1173         }
1174
1175         if (!(flags & FB_IGNOREMON) &&
1176             (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1177              timings.hfreq < hfmin || timings.hfreq > hfmax ||
1178              timings.dclk < dclkmin || timings.dclk > dclkmax))
1179                 return -EINVAL;
1180
1181         var->pixclock = KHZ2PICOS(timings.dclk/1000);
1182         var->hsync_len = (timings.htotal * 8)/100;
1183         var->right_margin = (timings.hblank/2) - var->hsync_len;
1184         var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1185
1186         var->vsync_len = (3 * interlace)/dscan;
1187         var->lower_margin = (1 * interlace)/dscan;
1188         var->upper_margin = (timings.vblank * interlace)/dscan -
1189                 (var->vsync_len + var->lower_margin);
1190
1191         return 0;
1192 }
1193 #else
1194 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1195 {
1196         return 1;
1197 }
1198 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1199 {
1200         specs = NULL;
1201 }
1202 void fb_destroy_modedb(struct fb_videomode *modedb)
1203 {
1204 }
1205 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1206                 struct fb_info *info)
1207 {
1208         return -EINVAL;
1209 }
1210 #endif /* CONFIG_FB_MODE_HELPERS */
1211
1212 /*
1213  * fb_validate_mode - validates var against monitor capabilities
1214  * @var: pointer to fb_var_screeninfo
1215  * @info: pointer to fb_info
1216  *
1217  * DESCRIPTION:
1218  * Validates video mode against monitor capabilities specified in
1219  * info->monspecs.
1220  *
1221  * REQUIRES:
1222  * A valid info->monspecs.
1223  */
1224 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1225 {
1226         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1227         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1228
1229         /*
1230          * If monspecs are invalid, use values that are enough
1231          * for 640x480@60
1232          */
1233         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1234             !info->monspecs.dclkmax ||
1235             info->monspecs.hfmax < info->monspecs.hfmin ||
1236             info->monspecs.vfmax < info->monspecs.vfmin ||
1237             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1238                 hfmin = 29000; hfmax = 30000;
1239                 vfmin = 60; vfmax = 60;
1240                 dclkmin = 0; dclkmax = 25000000;
1241         } else {
1242                 hfmin = info->monspecs.hfmin;
1243                 hfmax = info->monspecs.hfmax;
1244                 vfmin = info->monspecs.vfmin;
1245                 vfmax = info->monspecs.vfmax;
1246                 dclkmin = info->monspecs.dclkmin;
1247                 dclkmax = info->monspecs.dclkmax;
1248         }
1249
1250         if (!var->pixclock)
1251                 return -EINVAL;
1252         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1253
1254         htotal = var->xres + var->right_margin + var->hsync_len +
1255                 var->left_margin;
1256         vtotal = var->yres + var->lower_margin + var->vsync_len +
1257                 var->upper_margin;
1258
1259         if (var->vmode & FB_VMODE_INTERLACED)
1260                 vtotal /= 2;
1261         if (var->vmode & FB_VMODE_DOUBLE)
1262                 vtotal *= 2;
1263
1264         hfreq = pixclock/htotal;
1265         hfreq = (hfreq + 500) / 1000 * 1000;
1266
1267         vfreq = hfreq/vtotal;
1268
1269         return (vfreq < vfmin || vfreq > vfmax ||
1270                 hfreq < hfmin || hfreq > hfmax ||
1271                 pixclock < dclkmin || pixclock > dclkmax) ?
1272                 -EINVAL : 0;
1273 }
1274
1275 #if defined(__i386__)
1276 #include <linux/pci.h>
1277
1278 /*
1279  * We need to ensure that the EDID block is only returned for
1280  * the primary graphics adapter.
1281  */
1282
1283 const unsigned char *fb_firmware_edid(struct device *device)
1284 {
1285         struct pci_dev *dev = NULL;
1286         struct resource *res = NULL;
1287         unsigned char *edid = NULL;
1288
1289         if (device)
1290                 dev = to_pci_dev(device);
1291
1292         if (dev)
1293                 res = &dev->resource[PCI_ROM_RESOURCE];
1294
1295         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1296                 edid = edid_info.dummy;
1297
1298         return edid;
1299 }
1300 #else
1301 const unsigned char *fb_firmware_edid(struct device *device)
1302 {
1303         return NULL;
1304 }
1305 #endif /* _i386_ */
1306
1307 EXPORT_SYMBOL(fb_parse_edid);
1308 EXPORT_SYMBOL(fb_edid_to_monspecs);
1309 EXPORT_SYMBOL(fb_firmware_edid);
1310 EXPORT_SYMBOL(fb_get_mode);
1311 EXPORT_SYMBOL(fb_validate_mode);
1312 EXPORT_SYMBOL(fb_destroy_modedb);