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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 #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("   Supported VESA Modes\n");
 542         block = edid + ESTABLISHED_TIMING_1;
 543         num += get_est_timing(block, &mode[num]);
 544
 545         DPRINTK("   Standard Timings\n");
 546         block = edid + STD_TIMING_DESCRIPTIONS_START;
 547         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 548                 num += get_std_timing(block, &mode[num]);
 549
 550         DPRINTK("   Detailed Timings\n");
 551         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 552         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 553                 int first = 1;
 554
 555                 if (block[0] == 0x00 && block[1] == 0x00) {
 556                         if (block[3] == 0xfa) {
 557                                 num += get_dst_timing(block + 5, &mode[num]);
 558                         }
 559                 } else  {
 560                         get_detailed_timing(block, &mode[num]);
 561                         if (first) {
 562                                 mode[num].flag |= FB_MODE_IS_FIRST;
 563                                 first = 0;
 564                         }
 565                         num++;
 566                 }
 567         }
 568
 569         /* Yikes, EDID data is totally useless */
 570         if (!num) {
 571                 kfree(mode);
 572                 return NULL;
 573         }
 574
 575         *dbsize = num;
 576         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 577         if (!m)
 578                 return mode;
 579         memmove(m, mode, num * sizeof(struct fb_videomode));
 580         kfree(mode);
 581         return m;
 582 }
 583
 584 /**
 585  * fb_destroy_modedb - destroys mode database
 586  * @modedb: mode database to destroy
 587  *
 588  * DESCRIPTION:
 589  * Destroy mode database created by fb_create_modedb
 590  */
 591 void fb_destroy_modedb(struct fb_videomode *modedb)
 592 {
 593         kfree(modedb);
 594 }
 595
 596 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 597 {
 598         int i, retval = 1;
 599         unsigned char *block;
 600
 601         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 602
 603         DPRINTK("      Monitor Operating Limits: ");
 604         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 605                 if (edid_is_limits_block(block)) {
 606                         specs->hfmin = H_MIN_RATE * 1000;
 607                         specs->hfmax = H_MAX_RATE * 1000;
 608                         specs->vfmin = V_MIN_RATE;
 609                         specs->vfmax = V_MAX_RATE;
 610                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 611                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 612                         retval = 0;
 613                         DPRINTK("From EDID\n");
 614                         break;
 615                 }
 616         }
 617
 618         /* estimate monitor limits based on modes supported */
 619         if (retval) {
 620                 struct fb_videomode *modes;
 621                 int num_modes, i, hz, hscan, pixclock;
 622
 623                 modes = fb_create_modedb(edid, &num_modes);
 624                 if (!modes) {
 625                         DPRINTK("None Available\n");
 626                         return 1;
 627                 }
 628
 629                 retval = 0;
 630                 for (i = 0; i < num_modes; i++) {
 631                         hz = modes[i].refresh;
 632                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 633                         hscan = (modes[i].yres * 105 * hz + 5000)/100;
 634
 635                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 636                                 specs->dclkmax = pixclock;
 637                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 638                                 specs->dclkmin = pixclock;
 639                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 640                                 specs->hfmax = hscan;
 641                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 642                                 specs->hfmin = hscan;
 643                         if (specs->vfmax == 0 || specs->vfmax < hz)
 644                                 specs->vfmax = hz;
 645                         if (specs->vfmin == 0 || specs->vfmin > hz)
 646                                 specs->vfmin = hz;
 647                 }
 648                 DPRINTK("Extrapolated\n");
 649                 fb_destroy_modedb(modes);
 650         }
 651         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 652                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 653                 specs->vfmax, specs->dclkmax/1000000);
 654         return retval;
 655 }
 656
 657 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 658 {
 659         unsigned char c, *block;
 660
 661         block = edid + EDID_STRUCT_DISPLAY;
 662
 663         fb_get_monitor_limits(edid, specs);
 664
 665         c = block[0] & 0x80;
 666         specs->input = 0;
 667         if (c) {
 668                 specs->input |= FB_DISP_DDI;
 669                 DPRINTK("      Digital Display Input");
 670         } else {
 671                 DPRINTK("      Analog Display Input: Input Voltage - ");
 672                 switch ((block[0] & 0x60) >> 5) {
 673                 case 0:
 674                         DPRINTK("0.700V/0.300V");
 675                         specs->input |= FB_DISP_ANA_700_300;
 676                         break;
 677                 case 1:
 678                         DPRINTK("0.714V/0.286V");
 679                         specs->input |= FB_DISP_ANA_714_286;
 680                         break;
 681                 case 2:
 682                         DPRINTK("1.000V/0.400V");
 683                         specs->input |= FB_DISP_ANA_1000_400;
 684                         break;
 685                 case 3:
 686                         DPRINTK("0.700V/0.000V");
 687                         specs->input |= FB_DISP_ANA_700_000;
 688                         break;
 689                 }
 690         }
 691         DPRINTK("\n      Sync: ");
 692         c = block[0] & 0x10;
 693         if (c)
 694                 DPRINTK("      Configurable signal level\n");
 695         c = block[0] & 0x0f;
 696         specs->signal = 0;
 697         if (c & 0x10) {
 698                 DPRINTK("Blank to Blank ");
 699                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 700         }
 701         if (c & 0x08) {
 702                 DPRINTK("Separate ");
 703                 specs->signal |= FB_SIGNAL_SEPARATE;
 704         }
 705         if (c & 0x04) {
 706                 DPRINTK("Composite ");
 707                 specs->signal |= FB_SIGNAL_COMPOSITE;
 708         }
 709         if (c & 0x02) {
 710                 DPRINTK("Sync on Green ");
 711                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 712         }
 713         if (c & 0x01) {
 714                 DPRINTK("Serration on ");
 715                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 716         }
 717         DPRINTK("\n");
 718         specs->max_x = block[1];
 719         specs->max_y = block[2];
 720         DPRINTK("      Max H-size in cm: ");
 721         if (specs->max_x)
 722                 DPRINTK("%d\n", specs->max_x);
 723         else
 724                 DPRINTK("variable\n");
 725         DPRINTK("      Max V-size in cm: ");
 726         if (specs->max_y)
 727                 DPRINTK("%d\n", specs->max_y);
 728         else
 729                 DPRINTK("variable\n");
 730
 731         c = block[3];
 732         specs->gamma = c+100;
 733         DPRINTK("      Gamma: ");
 734         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 735
 736         get_dpms_capabilities(block[4], specs);
 737
 738         switch ((block[4] & 0x18) >> 3) {
 739         case 0:
 740                 DPRINTK("      Monochrome/Grayscale\n");
 741                 specs->input |= FB_DISP_MONO;
 742                 break;
 743         case 1:
 744                 DPRINTK("      RGB Color Display\n");
 745                 specs->input |= FB_DISP_RGB;
 746                 break;
 747         case 2:
 748                 DPRINTK("      Non-RGB Multicolor Display\n");
 749                 specs->input |= FB_DISP_MULTI;
 750                 break;
 751         default:
 752                 DPRINTK("      Unknown\n");
 753                 specs->input |= FB_DISP_UNKNOWN;
 754                 break;
 755         }
 756
 757         get_chroma(block, specs);
 758
 759         specs->misc = 0;
 760         c = block[4] & 0x7;
 761         if (c & 0x04) {
 762                 DPRINTK("      Default color format is primary\n");
 763                 specs->misc |= FB_MISC_PRIM_COLOR;
 764         }
 765         if (c & 0x02) {
 766                 DPRINTK("      First DETAILED Timing is preferred\n");
 767                 specs->misc |= FB_MISC_1ST_DETAIL;
 768         }
 769         if (c & 0x01) {
 770                 printk("      Display is GTF capable\n");
 771                 specs->gtf = 1;
 772         }
 773 }
 774
 775 static int edid_is_timing_block(unsigned char *block)
 776 {
 777         if ((block[0] != 0x00) || (block[1] != 0x00) ||
 778             (block[2] != 0x00) || (block[4] != 0x00))
 779                 return 1;
 780         else
 781                 return 0;
 782 }
 783
 784 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 785 {
 786         int i;
 787         unsigned char *block;
 788
 789         if (edid == NULL || var == NULL)
 790                 return 1;
 791
 792         if (!(edid_checksum(edid)))
 793                 return 1;
 794
 795         if (!(edid_check_header(edid)))
 796                 return 1;
 797
 798         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 799
 800         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 801                 if (edid_is_timing_block(block)) {
 802                         var->xres = var->xres_virtual = H_ACTIVE;
 803                         var->yres = var->yres_virtual = V_ACTIVE;
 804                         var->height = var->width = -1;
 805                         var->right_margin = H_SYNC_OFFSET;
 806                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 807                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 808                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 809                                 V_SYNC_WIDTH;
 810                         var->lower_margin = V_SYNC_OFFSET;
 811                         var->hsync_len = H_SYNC_WIDTH;
 812                         var->vsync_len = V_SYNC_WIDTH;
 813                         var->pixclock = PIXEL_CLOCK;
 814                         var->pixclock /= 1000;
 815                         var->pixclock = KHZ2PICOS(var->pixclock);
 816
 817                         if (HSYNC_POSITIVE)
 818                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 819                         if (VSYNC_POSITIVE)
 820                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 821                         return 0;
 822                 }
 823         }
 824         return 1;
 825 }
 826
 827 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 828 {
 829         unsigned char *block;
 830         int i;
 831
 832         if (edid == NULL)
 833                 return;
 834
 835         if (!(edid_checksum(edid)))
 836                 return;
 837
 838         if (!(edid_check_header(edid)))
 839                 return;
 840
 841         memset(specs, 0, sizeof(struct fb_monspecs));
 842
 843         specs->version = edid[EDID_STRUCT_VERSION];
 844         specs->revision = edid[EDID_STRUCT_REVISION];
 845
 846         DPRINTK("========================================\n");
 847         DPRINTK("Display Information (EDID)\n");
 848         DPRINTK("========================================\n");
 849         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 850                (int) specs->revision);
 851
 852         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 853
 854         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 855         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 856                 if (edid_is_serial_block(block)) {
 857                         copy_string(block, specs->serial_no);
 858                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 859                 } else if (edid_is_ascii_block(block)) {
 860                         copy_string(block, specs->ascii);
 861                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 862                 } else if (edid_is_monitor_block(block)) {
 863                         copy_string(block, specs->monitor);
 864                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 865                 }
 866         }
 867
 868         DPRINTK("   Display Characteristics:\n");
 869         get_monspecs(edid, specs);
 870
 871         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 872         DPRINTK("========================================\n");
 873 }
 874
 875 /*
 876  * VESA Generalized Timing Formula (GTF)
 877  */
 878
 879 #define FLYBACK                     550
 880 #define V_FRONTPORCH                1
 881 #define H_OFFSET                    40
 882 #define H_SCALEFACTOR               20
 883 #define H_BLANKSCALE                128
 884 #define H_GRADIENT                  600
 885 #define C_VAL                       30
 886 #define M_VAL                       300
 887
 888 struct __fb_timings {
 889         u32 dclk;
 890         u32 hfreq;
 891         u32 vfreq;
 892         u32 hactive;
 893         u32 vactive;
 894         u32 hblank;
 895         u32 vblank;
 896         u32 htotal;
 897         u32 vtotal;
 898 };
 899
 900 /**
 901  * fb_get_vblank - get vertical blank time
 902  * @hfreq: horizontal freq
 903  *
 904  * DESCRIPTION:
 905  * vblank = right_margin + vsync_len + left_margin
 906  *
 907  *    given: right_margin = 1 (V_FRONTPORCH)
 908  *           vsync_len    = 3
 909  *           flyback      = 550
 910  *
 911  *                          flyback * hfreq
 912  *           left_margin  = --------------- - vsync_len
 913  *                           1000000
 914  */
 915 static u32 fb_get_vblank(u32 hfreq)
 916 {
 917         u32 vblank;
 918
 919         vblank = (hfreq * FLYBACK)/1000;
 920         vblank = (vblank + 500)/1000;
 921         return (vblank + V_FRONTPORCH);
 922 }
 923
 924 /**
 925  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
 926  * @hfreq: horizontal freq
 927  * @xres: horizontal resolution in pixels
 928  *
 929  * DESCRIPTION:
 930  *
 931  *           xres * duty_cycle
 932  * hblank = ------------------
 933  *           100 - duty_cycle
 934  *
 935  * duty cycle = percent of htotal assigned to inactive display
 936  * duty cycle = C - (M/Hfreq)
 937  *
 938  * where: C = ((offset - scale factor) * blank_scale)
 939  *            -------------------------------------- + scale factor
 940  *                        256
 941  *        M = blank_scale * gradient
 942  *
 943  */
 944 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
 945 {
 946         u32 c_val, m_val, duty_cycle, hblank;
 947
 948         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
 949                  H_SCALEFACTOR) * 1000;
 950         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
 951         m_val = (m_val * 1000000)/hfreq;
 952         duty_cycle = c_val - m_val;
 953         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
 954         return (hblank);
 955 }
 956
 957 /**
 958  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
 959  * @dclk: pixelclock in Hz
 960  * @xres: horizontal resolution in pixels
 961  *
 962  * DESCRIPTION:
 963  *
 964  *           xres * duty_cycle
 965  * hblank = ------------------
 966  *           100 - duty_cycle
 967  *
 968  * duty cycle = percent of htotal assigned to inactive display
 969  * duty cycle = C - (M * h_period)
 970  *
 971  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
 972  *                   -----------------------------------------------
 973  *                                    2 * M
 974  *        M = 300;
 975  *        C = 30;
 976
 977  */
 978 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
 979 {
 980         u32 duty_cycle, h_period, hblank;
 981
 982         dclk /= 1000;
 983         h_period = 100 - C_VAL;
 984         h_period *= h_period;
 985         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
 986         h_period *=10000;
 987
 988         h_period = int_sqrt(h_period);
 989         h_period -= (100 - C_VAL) * 100;
 990         h_period *= 1000;
 991         h_period /= 2 * M_VAL;
 992
 993         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
 994         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
 995         hblank &= ~15;
 996         return (hblank);
 997 }
 998
 999 /**
1000  * fb_get_hfreq - estimate hsync
1001  * @vfreq: vertical refresh rate
1002  * @yres: vertical resolution
1003  *
1004  * DESCRIPTION:
1005  *
1006  *          (yres + front_port) * vfreq * 1000000
1007  * hfreq = -------------------------------------
1008  *          (1000000 - (vfreq * FLYBACK)
1009  *
1010  */
1011
1012 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1013 {
1014         u32 divisor, hfreq;
1015
1016         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1017         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1018         return (hfreq/divisor);
1019 }
1020
1021 static void fb_timings_vfreq(struct __fb_timings *timings)
1022 {
1023         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1024         timings->vblank = fb_get_vblank(timings->hfreq);
1025         timings->vtotal = timings->vactive + timings->vblank;
1026         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1027                                                  timings->hactive);
1028         timings->htotal = timings->hactive + timings->hblank;
1029         timings->dclk = timings->htotal * timings->hfreq;
1030 }
1031
1032 static void fb_timings_hfreq(struct __fb_timings *timings)
1033 {
1034         timings->vblank = fb_get_vblank(timings->hfreq);
1035         timings->vtotal = timings->vactive + timings->vblank;
1036         timings->vfreq = timings->hfreq/timings->vtotal;
1037         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1038                                                  timings->hactive);
1039         timings->htotal = timings->hactive + timings->hblank;
1040         timings->dclk = timings->htotal * timings->hfreq;
1041 }
1042
1043 static void fb_timings_dclk(struct __fb_timings *timings)
1044 {
1045         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1046                                                 timings->hactive);
1047         timings->htotal = timings->hactive + timings->hblank;
1048         timings->hfreq = timings->dclk/timings->htotal;
1049         timings->vblank = fb_get_vblank(timings->hfreq);
1050         timings->vtotal = timings->vactive + timings->vblank;
1051         timings->vfreq = timings->hfreq/timings->vtotal;
1052 }
1053
1054 /*
1055  * fb_get_mode - calculates video mode using VESA GTF
1056  * @flags: if: 0 - maximize vertical refresh rate
1057  *             1 - vrefresh-driven calculation;
1058  *             2 - hscan-driven calculation;
1059  *             3 - pixelclock-driven calculation;
1060  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1061  * @var: pointer to fb_var_screeninfo
1062  * @info: pointer to fb_info
1063  *
1064  * DESCRIPTION:
1065  * Calculates video mode based on monitor specs using VESA GTF.
1066  * The GTF is best for VESA GTF compliant monitors but is
1067  * specifically formulated to work for older monitors as well.
1068  *
1069  * If @flag==0, the function will attempt to maximize the
1070  * refresh rate.  Otherwise, it will calculate timings based on
1071  * the flag and accompanying value.
1072  *
1073  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1074  * ignored and @var will be filled with the calculated timings.
1075  *
1076  * All calculations are based on the VESA GTF Spreadsheet
1077  * available at VESA's public ftp (http://www.vesa.org).
1078  *
1079  * NOTES:
1080  * The timings generated by the GTF will be different from VESA
1081  * DMT.  It might be a good idea to keep a table of standard
1082  * VESA modes as well.  The GTF may also not work for some displays,
1083  * such as, and especially, analog TV.
1084  *
1085  * REQUIRES:
1086  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1087  */
1088 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1089 {
1090         struct __fb_timings timings;
1091         u32 interlace = 1, dscan = 1;
1092         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1093
1094         /*
1095          * If monspecs are invalid, use values that are enough
1096          * for 640x480@60
1097          */
1098         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1099             !info->monspecs.dclkmax ||
1100             info->monspecs.hfmax < info->monspecs.hfmin ||
1101             info->monspecs.vfmax < info->monspecs.vfmin ||
1102             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1103                 hfmin = 29000; hfmax = 30000;
1104                 vfmin = 60; vfmax = 60;
1105                 dclkmin = 0; dclkmax = 25000000;
1106         } else {
1107                 hfmin = info->monspecs.hfmin;
1108                 hfmax = info->monspecs.hfmax;
1109                 vfmin = info->monspecs.vfmin;
1110                 vfmax = info->monspecs.vfmax;
1111                 dclkmin = info->monspecs.dclkmin;
1112                 dclkmax = info->monspecs.dclkmax;
1113         }
1114
1115         memset(&timings, 0, sizeof(struct __fb_timings));
1116         timings.hactive = var->xres;
1117         timings.vactive = var->yres;
1118         if (var->vmode & FB_VMODE_INTERLACED) {
1119                 timings.vactive /= 2;
1120                 interlace = 2;
1121         }
1122         if (var->vmode & FB_VMODE_DOUBLE) {
1123                 timings.vactive *= 2;
1124                 dscan = 2;
1125         }
1126
1127         switch (flags & ~FB_IGNOREMON) {
1128         case FB_MAXTIMINGS: /* maximize refresh rate */
1129                 timings.hfreq = hfmax;
1130                 fb_timings_hfreq(&timings);
1131                 if (timings.vfreq > vfmax) {
1132                         timings.vfreq = vfmax;
1133                         fb_timings_vfreq(&timings);
1134                 }
1135                 if (timings.dclk > dclkmax) {
1136                         timings.dclk = dclkmax;
1137                         fb_timings_dclk(&timings);
1138                 }
1139                 break;
1140         case FB_VSYNCTIMINGS: /* vrefresh driven */
1141                 timings.vfreq = val;
1142                 fb_timings_vfreq(&timings);
1143                 break;
1144         case FB_HSYNCTIMINGS: /* hsync driven */
1145                 timings.hfreq = val;
1146                 fb_timings_hfreq(&timings);
1147                 break;
1148         case FB_DCLKTIMINGS: /* pixelclock driven */
1149                 timings.dclk = PICOS2KHZ(val) * 1000;
1150                 fb_timings_dclk(&timings);
1151                 break;
1152         default:
1153                 return -EINVAL;
1154
1155         }
1156
1157         if (!(flags & FB_IGNOREMON) &&
1158             (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1159              timings.hfreq < hfmin || timings.hfreq > hfmax ||
1160              timings.dclk < dclkmin || timings.dclk > dclkmax))
1161                 return -EINVAL;
1162
1163         var->pixclock = KHZ2PICOS(timings.dclk/1000);
1164         var->hsync_len = (timings.htotal * 8)/100;
1165         var->right_margin = (timings.hblank/2) - var->hsync_len;
1166         var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1167
1168         var->vsync_len = (3 * interlace)/dscan;
1169         var->lower_margin = (1 * interlace)/dscan;
1170         var->upper_margin = (timings.vblank * interlace)/dscan -
1171                 (var->vsync_len + var->lower_margin);
1172
1173         return 0;
1174 }
1175 #else
1176 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1177 {
1178         return 1;
1179 }
1180 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1181 {
1182         specs = NULL;
1183 }
1184 void fb_destroy_modedb(struct fb_videomode *modedb)
1185 {
1186 }
1187 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1188                 struct fb_info *info)
1189 {
1190         return -EINVAL;
1191 }
1192 #endif /* CONFIG_FB_MODE_HELPERS */
1193
1194 /*
1195  * fb_validate_mode - validates var against monitor capabilities
1196  * @var: pointer to fb_var_screeninfo
1197  * @info: pointer to fb_info
1198  *
1199  * DESCRIPTION:
1200  * Validates video mode against monitor capabilities specified in
1201  * info->monspecs.
1202  *
1203  * REQUIRES:
1204  * A valid info->monspecs.
1205  */
1206 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1207 {
1208         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1209         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1210
1211         /*
1212          * If monspecs are invalid, use values that are enough
1213          * for 640x480@60
1214          */
1215         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1216             !info->monspecs.dclkmax ||
1217             info->monspecs.hfmax < info->monspecs.hfmin ||
1218             info->monspecs.vfmax < info->monspecs.vfmin ||
1219             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1220                 hfmin = 29000; hfmax = 30000;
1221                 vfmin = 60; vfmax = 60;
1222                 dclkmin = 0; dclkmax = 25000000;
1223         } else {
1224                 hfmin = info->monspecs.hfmin;
1225                 hfmax = info->monspecs.hfmax;
1226                 vfmin = info->monspecs.vfmin;
1227                 vfmax = info->monspecs.vfmax;
1228                 dclkmin = info->monspecs.dclkmin;
1229                 dclkmax = info->monspecs.dclkmax;
1230         }
1231
1232         if (!var->pixclock)
1233                 return -EINVAL;
1234         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1235
1236         htotal = var->xres + var->right_margin + var->hsync_len +
1237                 var->left_margin;
1238         vtotal = var->yres + var->lower_margin + var->vsync_len +
1239                 var->upper_margin;
1240
1241         if (var->vmode & FB_VMODE_INTERLACED)
1242                 vtotal /= 2;
1243         if (var->vmode & FB_VMODE_DOUBLE)
1244                 vtotal *= 2;
1245
1246         hfreq = pixclock/htotal;
1247         hfreq = (hfreq + 500) / 1000 * 1000;
1248
1249         vfreq = hfreq/vtotal;
1250
1251         return (vfreq < vfmin || vfreq > vfmax ||
1252                 hfreq < hfmin || hfreq > hfmax ||
1253                 pixclock < dclkmin || pixclock > dclkmax) ?
1254                 -EINVAL : 0;
1255 }
1256
1257 #if defined(__i386__)
1258 #include <linux/pci.h>
1259
1260 /*
1261  * We need to ensure that the EDID block is only returned for
1262  * the primary graphics adapter.
1263  */
1264
1265 const unsigned char *fb_firmware_edid(struct device *device)
1266 {
1267         struct pci_dev *dev = NULL;
1268         struct resource *res = NULL;
1269         unsigned char *edid = NULL;
1270
1271         if (device)
1272                 dev = to_pci_dev(device);
1273
1274         if (dev)
1275                 res = &dev->resource[PCI_ROM_RESOURCE];
1276
1277         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1278                 edid = edid_info.dummy;
1279
1280         return edid;
1281 }
1282 #else
1283 const unsigned char *fb_firmware_edid(struct device *device)
1284 {
1285         return NULL;
1286 }
1287 #endif /* _i386_ */
1288
1289 EXPORT_SYMBOL(fb_parse_edid);
1290 EXPORT_SYMBOL(fb_edid_to_monspecs);
1291 EXPORT_SYMBOL(fb_firmware_edid);
1292 EXPORT_SYMBOL(fb_get_mode);
1293 EXPORT_SYMBOL(fb_validate_mode);
1294 EXPORT_SYMBOL(fb_destroy_modedb);