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   1 /*
   2  * linux/drivers/video/fbmon.c
   3  *
   4  * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
   5  *
   6  * Credits:
   7  *
   8  * The EDID Parser is a conglomeration from the following sources:
   9  *
  10  *   1. SciTech SNAP Graphics Architecture
  11  *      Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
  12  *
  13  *   2. XFree86 4.3.0, interpret_edid.c
  14  *      Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
  15  *
  16  *   3. John Fremlin <vii@users.sourceforge.net> and
  17  *      Ani Joshi <ajoshi@unixbox.com>
  18  *
  19  * Generalized Timing Formula is derived from:
  20  *
  21  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  22  *      available at http://www.vesa.org
  23  *
  24  * This file is subject to the terms and conditions of the GNU General Public
  25  * License.  See the file COPYING in the main directory of this archive
  26  * for more details.
  27  *
  28  */
  29 #include <linux/tty.h>
  30 #include <linux/fb.h>
  31 #include <linux/module.h>
  32 #ifdef CONFIG_PPC_OF
  33 #include <linux/pci.h>
  34 #include <asm/prom.h>
  35 #include <asm/pci-bridge.h>
  36 #endif
  37 #include <video/edid.h>
  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, struct fb_videomode *mode)
 318 {
 319         struct fb_var_screeninfo var;
 320         struct fb_info info;
 321
 322         var.xres = xres;
 323         var.yres = yres;
 324         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
 325                     refresh, &var, &info);
 326         mode->xres = xres;
 327         mode->yres = yres;
 328         mode->pixclock = var.pixclock;
 329         mode->refresh = refresh;
 330         mode->left_margin = var.left_margin;
 331         mode->right_margin = var.right_margin;
 332         mode->upper_margin = var.upper_margin;
 333         mode->lower_margin = var.lower_margin;
 334         mode->hsync_len = var.hsync_len;
 335         mode->vsync_len = var.vsync_len;
 336         mode->vmode = 0;
 337         mode->sync = 0;
 338 }
 339
 340 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
 341 {
 342         int num = 0;
 343         unsigned char c;
 344
 345         c = block[0];
 346         if (c&0x80) {
 347                 calc_mode_timings(720, 400, 70, &mode[num]);
 348                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 349                 DPRINTK("      720x400@70Hz\n");
 350         }
 351         if (c&0x40) {
 352                 calc_mode_timings(720, 400, 88, &mode[num]);
 353                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 354                 DPRINTK("      720x400@88Hz\n");
 355         }
 356         if (c&0x20) {
 357                 mode[num++] = vesa_modes[3];
 358                 DPRINTK("      640x480@60Hz\n");
 359         }
 360         if (c&0x10) {
 361                 calc_mode_timings(640, 480, 67, &mode[num]);
 362                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 363                 DPRINTK("      640x480@67Hz\n");
 364         }
 365         if (c&0x08) {
 366                 mode[num++] = vesa_modes[4];
 367                 DPRINTK("      640x480@72Hz\n");
 368         }
 369         if (c&0x04) {
 370                 mode[num++] = vesa_modes[5];
 371                 DPRINTK("      640x480@75Hz\n");
 372         }
 373         if (c&0x02) {
 374                 mode[num++] = vesa_modes[7];
 375                 DPRINTK("      800x600@56Hz\n");
 376         }
 377         if (c&0x01) {
 378                 mode[num++] = vesa_modes[8];
 379                 DPRINTK("      800x600@60Hz\n");
 380         }
 381
 382         c = block[1];
 383         if (c&0x80) {
 384                 mode[num++] = vesa_modes[9];
 385                 DPRINTK("      800x600@72Hz\n");
 386         }
 387         if (c&0x40) {
 388                 mode[num++] = vesa_modes[10];
 389                 DPRINTK("      800x600@75Hz\n");
 390         }
 391         if (c&0x20) {
 392                 calc_mode_timings(832, 624, 75, &mode[num]);
 393                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 394                 DPRINTK("      832x624@75Hz\n");
 395         }
 396         if (c&0x10) {
 397                 mode[num++] = vesa_modes[12];
 398                 DPRINTK("      1024x768@87Hz Interlaced\n");
 399         }
 400         if (c&0x08) {
 401                 mode[num++] = vesa_modes[13];
 402                 DPRINTK("      1024x768@60Hz\n");
 403         }
 404         if (c&0x04) {
 405                 mode[num++] = vesa_modes[14];
 406                 DPRINTK("      1024x768@70Hz\n");
 407         }
 408         if (c&0x02) {
 409                 mode[num++] = vesa_modes[15];
 410                 DPRINTK("      1024x768@75Hz\n");
 411         }
 412         if (c&0x01) {
 413                 mode[num++] = vesa_modes[21];
 414                 DPRINTK("      1280x1024@75Hz\n");
 415         }
 416         c = block[2];
 417         if (c&0x80) {
 418                 mode[num++] = vesa_modes[17];
 419                 DPRINTK("      1152x870@75Hz\n");
 420         }
 421         DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
 422         return num;
 423 }
 424
 425 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
 426 {
 427         int xres, yres = 0, refresh, ratio, i;
 428
 429         xres = (block[0] + 31) * 8;
 430         if (xres <= 256)
 431                 return 0;
 432
 433         ratio = (block[1] & 0xc0) >> 6;
 434         switch (ratio) {
 435         case 0:
 436                 yres = xres;
 437                 break;
 438         case 1:
 439                 yres = (xres * 3)/4;
 440                 break;
 441         case 2:
 442                 yres = (xres * 4)/5;
 443                 break;
 444         case 3:
 445                 yres = (xres * 9)/16;
 446                 break;
 447         }
 448         refresh = (block[1] & 0x3f) + 60;
 449
 450         DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 451         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 452                 if (vesa_modes[i].xres == xres &&
 453                     vesa_modes[i].yres == yres &&
 454                     vesa_modes[i].refresh == refresh) {
 455                         *mode = vesa_modes[i];
 456                         mode->flag |= FB_MODE_IS_STANDARD;
 457                         return 1;
 458                 }
 459         }
 460         calc_mode_timings(xres, yres, refresh, mode);
 461         return 1;
 462 }
 463
 464 static int get_dst_timing(unsigned char *block,
 465                           struct fb_videomode *mode)
 466 {
 467         int j, num = 0;
 468
 469         for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
 470                 num += get_std_timing(block, &mode[num]);
 471
 472         return num;
 473 }
 474
 475 static void get_detailed_timing(unsigned char *block,
 476                                 struct fb_videomode *mode)
 477 {
 478         mode->xres = H_ACTIVE;
 479         mode->yres = V_ACTIVE;
 480         mode->pixclock = PIXEL_CLOCK;
 481         mode->pixclock /= 1000;
 482         mode->pixclock = KHZ2PICOS(mode->pixclock);
 483         mode->right_margin = H_SYNC_OFFSET;
 484         mode->left_margin = (H_ACTIVE + H_BLANKING) -
 485                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 486         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 487                 V_SYNC_WIDTH;
 488         mode->lower_margin = V_SYNC_OFFSET;
 489         mode->hsync_len = H_SYNC_WIDTH;
 490         mode->vsync_len = V_SYNC_WIDTH;
 491         if (HSYNC_POSITIVE)
 492                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 493         if (VSYNC_POSITIVE)
 494                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 495         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 496                                      (V_ACTIVE + V_BLANKING));
 497         mode->vmode = 0;
 498         mode->flag = FB_MODE_IS_DETAILED;
 499
 500         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 501         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 502                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 503         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 504                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 505         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 506                (VSYNC_POSITIVE) ? "+" : "-");
 507 }
 508
 509 /**
 510  * fb_create_modedb - create video mode database
 511  * @edid: EDID data
 512  * @dbsize: database size
 513  *
 514  * RETURNS: struct fb_videomode, @dbsize contains length of database
 515  *
 516  * DESCRIPTION:
 517  * This function builds a mode database using the contents of the EDID
 518  * data
 519  */
 520 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 521 {
 522         struct fb_videomode *mode, *m;
 523         unsigned char *block;
 524         int num = 0, i;
 525
 526         mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 527         if (mode == NULL)
 528                 return NULL;
 529         memset(mode, 0, 50 * sizeof(struct fb_videomode));
 530
 531         if (edid == NULL || !edid_checksum(edid) ||
 532             !edid_check_header(edid)) {
 533                 kfree(mode);
 534                 return NULL;
 535         }
 536
 537         *dbsize = 0;
 538
 539         DPRINTK("   Supported VESA Modes\n");
 540         block = edid + ESTABLISHED_TIMING_1;
 541         num += get_est_timing(block, &mode[num]);
 542
 543         DPRINTK("   Standard Timings\n");
 544         block = edid + STD_TIMING_DESCRIPTIONS_START;
 545         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 546                 num += get_std_timing(block, &mode[num]);
 547
 548         DPRINTK("   Detailed Timings\n");
 549         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 550         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 551                 int first = 1;
 552
 553                 if (block[0] == 0x00 && block[1] == 0x00) {
 554                         if (block[3] == 0xfa) {
 555                                 num += get_dst_timing(block + 5, &mode[num]);
 556                         }
 557                 } else  {
 558                         get_detailed_timing(block, &mode[num]);
 559                         if (first) {
 560                                 mode[num].flag |= FB_MODE_IS_FIRST;
 561                                 first = 0;
 562                         }
 563                         num++;
 564                 }
 565         }
 566
 567         /* Yikes, EDID data is totally useless */
 568         if (!num) {
 569                 kfree(mode);
 570                 return NULL;
 571         }
 572
 573         *dbsize = num;
 574         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 575         if (!m)
 576                 return mode;
 577         memmove(m, mode, num * sizeof(struct fb_videomode));
 578         kfree(mode);
 579         return m;
 580 }
 581
 582 /**
 583  * fb_destroy_modedb - destroys mode database
 584  * @modedb: mode database to destroy
 585  *
 586  * DESCRIPTION:
 587  * Destroy mode database created by fb_create_modedb
 588  */
 589 void fb_destroy_modedb(struct fb_videomode *modedb)
 590 {
 591         kfree(modedb);
 592 }
 593
 594 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 595 {
 596         int i, retval = 1;
 597         unsigned char *block;
 598
 599         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 600
 601         DPRINTK("      Monitor Operating Limits: ");
 602         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 603                 if (edid_is_limits_block(block)) {
 604                         specs->hfmin = H_MIN_RATE * 1000;
 605                         specs->hfmax = H_MAX_RATE * 1000;
 606                         specs->vfmin = V_MIN_RATE;
 607                         specs->vfmax = V_MAX_RATE;
 608                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 609                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 610                         retval = 0;
 611                         DPRINTK("From EDID\n");
 612                         break;
 613                 }
 614         }
 615
 616         /* estimate monitor limits based on modes supported */
 617         if (retval) {
 618                 struct fb_videomode *modes;
 619                 int num_modes, i, hz, hscan, pixclock;
 620
 621                 modes = fb_create_modedb(edid, &num_modes);
 622                 if (!modes) {
 623                         DPRINTK("None Available\n");
 624                         return 1;
 625                 }
 626
 627                 retval = 0;
 628                 for (i = 0; i < num_modes; i++) {
 629                         hz = modes[i].refresh;
 630                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 631                         hscan = (modes[i].yres * 105 * hz + 5000)/100;
 632
 633                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 634                                 specs->dclkmax = pixclock;
 635                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 636                                 specs->dclkmin = pixclock;
 637                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 638                                 specs->hfmax = hscan;
 639                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 640                                 specs->hfmin = hscan;
 641                         if (specs->vfmax == 0 || specs->vfmax < hz)
 642                                 specs->vfmax = hz;
 643                         if (specs->vfmin == 0 || specs->vfmin > hz)
 644                                 specs->vfmin = hz;
 645                 }
 646                 DPRINTK("Extrapolated\n");
 647                 fb_destroy_modedb(modes);
 648         }
 649         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 650                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 651                 specs->vfmax, specs->dclkmax/1000000);
 652         return retval;
 653 }
 654
 655 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 656 {
 657         unsigned char c, *block;
 658
 659         block = edid + EDID_STRUCT_DISPLAY;
 660
 661         fb_get_monitor_limits(edid, specs);
 662
 663         c = block[0] & 0x80;
 664         specs->input = 0;
 665         if (c) {
 666                 specs->input |= FB_DISP_DDI;
 667                 DPRINTK("      Digital Display Input");
 668         } else {
 669                 DPRINTK("      Analog Display Input: Input Voltage - ");
 670                 switch ((block[0] & 0x60) >> 5) {
 671                 case 0:
 672                         DPRINTK("0.700V/0.300V");
 673                         specs->input |= FB_DISP_ANA_700_300;
 674                         break;
 675                 case 1:
 676                         DPRINTK("0.714V/0.286V");
 677                         specs->input |= FB_DISP_ANA_714_286;
 678                         break;
 679                 case 2:
 680                         DPRINTK("1.000V/0.400V");
 681                         specs->input |= FB_DISP_ANA_1000_400;
 682                         break;
 683                 case 3:
 684                         DPRINTK("0.700V/0.000V");
 685                         specs->input |= FB_DISP_ANA_700_000;
 686                         break;
 687                 }
 688         }
 689         DPRINTK("\n      Sync: ");
 690         c = block[0] & 0x10;
 691         if (c)
 692                 DPRINTK("      Configurable signal level\n");
 693         c = block[0] & 0x0f;
 694         specs->signal = 0;
 695         if (c & 0x10) {
 696                 DPRINTK("Blank to Blank ");
 697                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 698         }
 699         if (c & 0x08) {
 700                 DPRINTK("Separate ");
 701                 specs->signal |= FB_SIGNAL_SEPARATE;
 702         }
 703         if (c & 0x04) {
 704                 DPRINTK("Composite ");
 705                 specs->signal |= FB_SIGNAL_COMPOSITE;
 706         }
 707         if (c & 0x02) {
 708                 DPRINTK("Sync on Green ");
 709                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 710         }
 711         if (c & 0x01) {
 712                 DPRINTK("Serration on ");
 713                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 714         }
 715         DPRINTK("\n");
 716         specs->max_x = block[1];
 717         specs->max_y = block[2];
 718         DPRINTK("      Max H-size in cm: ");
 719         if (specs->max_x)
 720                 DPRINTK("%d\n", specs->max_x);
 721         else
 722                 DPRINTK("variable\n");
 723         DPRINTK("      Max V-size in cm: ");
 724         if (specs->max_y)
 725                 DPRINTK("%d\n", specs->max_y);
 726         else
 727                 DPRINTK("variable\n");
 728
 729         c = block[3];
 730         specs->gamma = c+100;
 731         DPRINTK("      Gamma: ");
 732         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 733
 734         get_dpms_capabilities(block[4], specs);
 735
 736         switch ((block[4] & 0x18) >> 3) {
 737         case 0:
 738                 DPRINTK("      Monochrome/Grayscale\n");
 739                 specs->input |= FB_DISP_MONO;
 740                 break;
 741         case 1:
 742                 DPRINTK("      RGB Color Display\n");
 743                 specs->input |= FB_DISP_RGB;
 744                 break;
 745         case 2:
 746                 DPRINTK("      Non-RGB Multicolor Display\n");
 747                 specs->input |= FB_DISP_MULTI;
 748                 break;
 749         default:
 750                 DPRINTK("      Unknown\n");
 751                 specs->input |= FB_DISP_UNKNOWN;
 752                 break;
 753         }
 754
 755         get_chroma(block, specs);
 756
 757         specs->misc = 0;
 758         c = block[4] & 0x7;
 759         if (c & 0x04) {
 760                 DPRINTK("      Default color format is primary\n");
 761                 specs->misc |= FB_MISC_PRIM_COLOR;
 762         }
 763         if (c & 0x02) {
 764                 DPRINTK("      First DETAILED Timing is preferred\n");
 765                 specs->misc |= FB_MISC_1ST_DETAIL;
 766         }
 767         if (c & 0x01) {
 768                 printk("      Display is GTF capable\n");
 769                 specs->gtf = 1;
 770         }
 771 }
 772
 773 static int edid_is_timing_block(unsigned char *block)
 774 {
 775         if ((block[0] != 0x00) || (block[1] != 0x00) ||
 776             (block[2] != 0x00) || (block[4] != 0x00))
 777                 return 1;
 778         else
 779                 return 0;
 780 }
 781
 782 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 783 {
 784         int i;
 785         unsigned char *block;
 786
 787         if (edid == NULL || var == NULL)
 788                 return 1;
 789
 790         if (!(edid_checksum(edid)))
 791                 return 1;
 792
 793         if (!(edid_check_header(edid)))
 794                 return 1;
 795
 796         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 797
 798         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 799                 if (edid_is_timing_block(block)) {
 800                         var->xres = var->xres_virtual = H_ACTIVE;
 801                         var->yres = var->yres_virtual = V_ACTIVE;
 802                         var->height = var->width = -1;
 803                         var->right_margin = H_SYNC_OFFSET;
 804                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 805                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 806                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 807                                 V_SYNC_WIDTH;
 808                         var->lower_margin = V_SYNC_OFFSET;
 809                         var->hsync_len = H_SYNC_WIDTH;
 810                         var->vsync_len = V_SYNC_WIDTH;
 811                         var->pixclock = PIXEL_CLOCK;
 812                         var->pixclock /= 1000;
 813                         var->pixclock = KHZ2PICOS(var->pixclock);
 814
 815                         if (HSYNC_POSITIVE)
 816                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 817                         if (VSYNC_POSITIVE)
 818                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 819                         return 0;
 820                 }
 821         }
 822         return 1;
 823 }
 824
 825 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 826 {
 827         unsigned char *block;
 828         int i;
 829
 830         if (edid == NULL)
 831                 return;
 832
 833         if (!(edid_checksum(edid)))
 834                 return;
 835
 836         if (!(edid_check_header(edid)))
 837                 return;
 838
 839         memset(specs, 0, sizeof(struct fb_monspecs));
 840
 841         specs->version = edid[EDID_STRUCT_VERSION];
 842         specs->revision = edid[EDID_STRUCT_REVISION];
 843
 844         DPRINTK("========================================\n");
 845         DPRINTK("Display Information (EDID)\n");
 846         DPRINTK("========================================\n");
 847         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 848                (int) specs->revision);
 849
 850         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 851
 852         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 853         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 854                 if (edid_is_serial_block(block)) {
 855                         copy_string(block, specs->serial_no);
 856                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 857                 } else if (edid_is_ascii_block(block)) {
 858                         copy_string(block, specs->ascii);
 859                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 860                 } else if (edid_is_monitor_block(block)) {
 861                         copy_string(block, specs->monitor);
 862                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 863                 }
 864         }
 865
 866         DPRINTK("   Display Characteristics:\n");
 867         get_monspecs(edid, specs);
 868
 869         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 870         DPRINTK("========================================\n");
 871 }
 872
 873 /*
 874  * VESA Generalized Timing Formula (GTF)
 875  */
 876
 877 #define FLYBACK                     550
 878 #define V_FRONTPORCH                1
 879 #define H_OFFSET                    40
 880 #define H_SCALEFACTOR               20
 881 #define H_BLANKSCALE                128
 882 #define H_GRADIENT                  600
 883 #define C_VAL                       30
 884 #define M_VAL                       300
 885
 886 struct __fb_timings {
 887         u32 dclk;
 888         u32 hfreq;
 889         u32 vfreq;
 890         u32 hactive;
 891         u32 vactive;
 892         u32 hblank;
 893         u32 vblank;
 894         u32 htotal;
 895         u32 vtotal;
 896 };
 897
 898 /**
 899  * fb_get_vblank - get vertical blank time
 900  * @hfreq: horizontal freq
 901  *
 902  * DESCRIPTION:
 903  * vblank = right_margin + vsync_len + left_margin
 904  *
 905  *    given: right_margin = 1 (V_FRONTPORCH)
 906  *           vsync_len    = 3
 907  *           flyback      = 550
 908  *
 909  *                          flyback * hfreq
 910  *           left_margin  = --------------- - vsync_len
 911  *                           1000000
 912  */
 913 static u32 fb_get_vblank(u32 hfreq)
 914 {
 915         u32 vblank;
 916
 917         vblank = (hfreq * FLYBACK)/1000;
 918         vblank = (vblank + 500)/1000;
 919         return (vblank + V_FRONTPORCH);
 920 }
 921
 922 /**
 923  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
 924  * @hfreq: horizontal freq
 925  * @xres: horizontal resolution in pixels
 926  *
 927  * DESCRIPTION:
 928  *
 929  *           xres * duty_cycle
 930  * hblank = ------------------
 931  *           100 - duty_cycle
 932  *
 933  * duty cycle = percent of htotal assigned to inactive display
 934  * duty cycle = C - (M/Hfreq)
 935  *
 936  * where: C = ((offset - scale factor) * blank_scale)
 937  *            -------------------------------------- + scale factor
 938  *                        256
 939  *        M = blank_scale * gradient
 940  *
 941  */
 942 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
 943 {
 944         u32 c_val, m_val, duty_cycle, hblank;
 945
 946         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
 947                  H_SCALEFACTOR) * 1000;
 948         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
 949         m_val = (m_val * 1000000)/hfreq;
 950         duty_cycle = c_val - m_val;
 951         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
 952         return (hblank);
 953 }
 954
 955 /**
 956  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
 957  * @dclk: pixelclock in Hz
 958  * @xres: horizontal resolution in pixels
 959  *
 960  * DESCRIPTION:
 961  *
 962  *           xres * duty_cycle
 963  * hblank = ------------------
 964  *           100 - duty_cycle
 965  *
 966  * duty cycle = percent of htotal assigned to inactive display
 967  * duty cycle = C - (M * h_period)
 968  *
 969  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
 970  *                   -----------------------------------------------
 971  *                                    2 * M
 972  *        M = 300;
 973  *        C = 30;
 974
 975  */
 976 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
 977 {
 978         u32 duty_cycle, h_period, hblank;
 979
 980         dclk /= 1000;
 981         h_period = 100 - C_VAL;
 982         h_period *= h_period;
 983         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
 984         h_period *=10000;
 985
 986         h_period = int_sqrt(h_period);
 987         h_period -= (100 - C_VAL) * 100;
 988         h_period *= 1000;
 989         h_period /= 2 * M_VAL;
 990
 991         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
 992         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
 993         hblank &= ~15;
 994         return (hblank);
 995 }
 996
 997 /**
 998  * fb_get_hfreq - estimate hsync
 999  * @vfreq: vertical refresh rate
1000  * @yres: vertical resolution
1001  *
1002  * DESCRIPTION:
1003  *
1004  *          (yres + front_port) * vfreq * 1000000
1005  * hfreq = -------------------------------------
1006  *          (1000000 - (vfreq * FLYBACK)
1007  *
1008  */
1009
1010 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1011 {
1012         u32 divisor, hfreq;
1013
1014         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1015         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1016         return (hfreq/divisor);
1017 }
1018
1019 static void fb_timings_vfreq(struct __fb_timings *timings)
1020 {
1021         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1022         timings->vblank = fb_get_vblank(timings->hfreq);
1023         timings->vtotal = timings->vactive + timings->vblank;
1024         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1025                                                  timings->hactive);
1026         timings->htotal = timings->hactive + timings->hblank;
1027         timings->dclk = timings->htotal * timings->hfreq;
1028 }
1029
1030 static void fb_timings_hfreq(struct __fb_timings *timings)
1031 {
1032         timings->vblank = fb_get_vblank(timings->hfreq);
1033         timings->vtotal = timings->vactive + timings->vblank;
1034         timings->vfreq = timings->hfreq/timings->vtotal;
1035         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1036                                                  timings->hactive);
1037         timings->htotal = timings->hactive + timings->hblank;
1038         timings->dclk = timings->htotal * timings->hfreq;
1039 }
1040
1041 static void fb_timings_dclk(struct __fb_timings *timings)
1042 {
1043         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1044                                                 timings->hactive);
1045         timings->htotal = timings->hactive + timings->hblank;
1046         timings->hfreq = timings->dclk/timings->htotal;
1047         timings->vblank = fb_get_vblank(timings->hfreq);
1048         timings->vtotal = timings->vactive + timings->vblank;
1049         timings->vfreq = timings->hfreq/timings->vtotal;
1050 }
1051
1052 /*
1053  * fb_get_mode - calculates video mode using VESA GTF
1054  * @flags: if: 0 - maximize vertical refresh rate
1055  *             1 - vrefresh-driven calculation;
1056  *             2 - hscan-driven calculation;
1057  *             3 - pixelclock-driven calculation;
1058  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1059  * @var: pointer to fb_var_screeninfo
1060  * @info: pointer to fb_info
1061  *
1062  * DESCRIPTION:
1063  * Calculates video mode based on monitor specs using VESA GTF.
1064  * The GTF is best for VESA GTF compliant monitors but is
1065  * specifically formulated to work for older monitors as well.
1066  *
1067  * If @flag==0, the function will attempt to maximize the
1068  * refresh rate.  Otherwise, it will calculate timings based on
1069  * the flag and accompanying value.
1070  *
1071  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1072  * ignored and @var will be filled with the calculated timings.
1073  *
1074  * All calculations are based on the VESA GTF Spreadsheet
1075  * available at VESA's public ftp (http://www.vesa.org).
1076  *
1077  * NOTES:
1078  * The timings generated by the GTF will be different from VESA
1079  * DMT.  It might be a good idea to keep a table of standard
1080  * VESA modes as well.  The GTF may also not work for some displays,
1081  * such as, and especially, analog TV.
1082  *
1083  * REQUIRES:
1084  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1085  */
1086 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1087 {
1088         struct __fb_timings timings;
1089         u32 interlace = 1, dscan = 1;
1090         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1091
1092         /*
1093          * If monspecs are invalid, use values that are enough
1094          * for 640x480@60
1095          */
1096         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1097             !info->monspecs.dclkmax ||
1098             info->monspecs.hfmax < info->monspecs.hfmin ||
1099             info->monspecs.vfmax < info->monspecs.vfmin ||
1100             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1101                 hfmin = 29000; hfmax = 30000;
1102                 vfmin = 60; vfmax = 60;
1103                 dclkmin = 0; dclkmax = 25000000;
1104         } else {
1105                 hfmin = info->monspecs.hfmin;
1106                 hfmax = info->monspecs.hfmax;
1107                 vfmin = info->monspecs.vfmin;
1108                 vfmax = info->monspecs.vfmax;
1109                 dclkmin = info->monspecs.dclkmin;
1110                 dclkmax = info->monspecs.dclkmax;
1111         }
1112
1113         memset(&timings, 0, sizeof(struct __fb_timings));
1114         timings.hactive = var->xres;
1115         timings.vactive = var->yres;
1116         if (var->vmode & FB_VMODE_INTERLACED) {
1117                 timings.vactive /= 2;
1118                 interlace = 2;
1119         }
1120         if (var->vmode & FB_VMODE_DOUBLE) {
1121                 timings.vactive *= 2;
1122                 dscan = 2;
1123         }
1124
1125         switch (flags & ~FB_IGNOREMON) {
1126         case FB_MAXTIMINGS: /* maximize refresh rate */
1127                 timings.hfreq = hfmax;
1128                 fb_timings_hfreq(&timings);
1129                 if (timings.vfreq > vfmax) {
1130                         timings.vfreq = vfmax;
1131                         fb_timings_vfreq(&timings);
1132                 }
1133                 if (timings.dclk > dclkmax) {
1134                         timings.dclk = dclkmax;
1135                         fb_timings_dclk(&timings);
1136                 }
1137                 break;
1138         case FB_VSYNCTIMINGS: /* vrefresh driven */
1139                 timings.vfreq = val;
1140                 fb_timings_vfreq(&timings);
1141                 break;
1142         case FB_HSYNCTIMINGS: /* hsync driven */
1143                 timings.hfreq = val;
1144                 fb_timings_hfreq(&timings);
1145                 break;
1146         case FB_DCLKTIMINGS: /* pixelclock driven */
1147                 timings.dclk = PICOS2KHZ(val) * 1000;
1148                 fb_timings_dclk(&timings);
1149                 break;
1150         default:
1151                 return -EINVAL;
1152
1153         }
1154
1155         if (!(flags & FB_IGNOREMON) &&
1156             (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1157              timings.hfreq < hfmin || timings.hfreq > hfmax ||
1158              timings.dclk < dclkmin || timings.dclk > dclkmax))
1159                 return -EINVAL;
1160
1161         var->pixclock = KHZ2PICOS(timings.dclk/1000);
1162         var->hsync_len = (timings.htotal * 8)/100;
1163         var->right_margin = (timings.hblank/2) - var->hsync_len;
1164         var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1165
1166         var->vsync_len = (3 * interlace)/dscan;
1167         var->lower_margin = (1 * interlace)/dscan;
1168         var->upper_margin = (timings.vblank * interlace)/dscan -
1169                 (var->vsync_len + var->lower_margin);
1170
1171         return 0;
1172 }
1173 #else
1174 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1175 {
1176         return 1;
1177 }
1178 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1179 {
1180         specs = NULL;
1181 }
1182 void fb_destroy_modedb(struct fb_videomode *modedb)
1183 {
1184 }
1185 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1186                 struct fb_info *info)
1187 {
1188         return -EINVAL;
1189 }
1190 #endif /* CONFIG_FB_MODE_HELPERS */
1191
1192 /*
1193  * fb_validate_mode - validates var against monitor capabilities
1194  * @var: pointer to fb_var_screeninfo
1195  * @info: pointer to fb_info
1196  *
1197  * DESCRIPTION:
1198  * Validates video mode against monitor capabilities specified in
1199  * info->monspecs.
1200  *
1201  * REQUIRES:
1202  * A valid info->monspecs.
1203  */
1204 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1205 {
1206         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1207         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1208
1209         /*
1210          * If monspecs are invalid, use values that are enough
1211          * for 640x480@60
1212          */
1213         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1214             !info->monspecs.dclkmax ||
1215             info->monspecs.hfmax < info->monspecs.hfmin ||
1216             info->monspecs.vfmax < info->monspecs.vfmin ||
1217             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1218                 hfmin = 29000; hfmax = 30000;
1219                 vfmin = 60; vfmax = 60;
1220                 dclkmin = 0; dclkmax = 25000000;
1221         } else {
1222                 hfmin = info->monspecs.hfmin;
1223                 hfmax = info->monspecs.hfmax;
1224                 vfmin = info->monspecs.vfmin;
1225                 vfmax = info->monspecs.vfmax;
1226                 dclkmin = info->monspecs.dclkmin;
1227                 dclkmax = info->monspecs.dclkmax;
1228         }
1229
1230         if (!var->pixclock)
1231                 return -EINVAL;
1232         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1233
1234         htotal = var->xres + var->right_margin + var->hsync_len +
1235                 var->left_margin;
1236         vtotal = var->yres + var->lower_margin + var->vsync_len +
1237                 var->upper_margin;
1238
1239         if (var->vmode & FB_VMODE_INTERLACED)
1240                 vtotal /= 2;
1241         if (var->vmode & FB_VMODE_DOUBLE)
1242                 vtotal *= 2;
1243
1244         hfreq = pixclock/htotal;
1245         vfreq = hfreq/vtotal;
1246
1247         return (vfreq < vfmin || vfreq > vfmax ||
1248                 hfreq < hfmin || hfreq > hfmax ||
1249                 pixclock < dclkmin || pixclock > dclkmax) ?
1250                 -EINVAL : 0;
1251 }
1252
1253 EXPORT_SYMBOL(fb_parse_edid);
1254 EXPORT_SYMBOL(fb_edid_to_monspecs);
1255
1256 EXPORT_SYMBOL(fb_get_mode);
1257 EXPORT_SYMBOL(fb_validate_mode);
1258 EXPORT_SYMBOL(fb_destroy_modedb);