drivers/video/fbmon.c

   1 /*
   2  * linux/drivers/video/fbmon.c
   3  *
   4  * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
   5  *
   6  * Credits:
   7  *
   8  * The EDID Parser is a conglomeration from the following sources:
   9  *
  10  *   1. SciTech SNAP Graphics Architecture
  11  *      Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
  12  *
  13  *   2. XFree86 4.3.0, interpret_edid.c
  14  *      Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
  15  *
  16  *   3. John Fremlin <vii@users.sourceforge.net> and
  17  *      Ani Joshi <ajoshi@unixbox.com>
  18  *
  19  * Generalized Timing Formula is derived from:
  20  *
  21  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  22  *      available at http://www.vesa.org
  23  *
  24  * This file is subject to the terms and conditions of the GNU General Public
  25  * License.  See the file COPYING in the main directory of this archive
  26  * for more details.
  27  *
  28  */
  29 #include <linux/fb.h>
  30 #include <linux/module.h>
  31 #include <linux/pci.h>
  32 #include <linux/slab.h>
  33 #include <video/edid.h>
  34 #ifdef CONFIG_PPC_OF
  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 #define FBMON_FIX_TIMINGS 3
  55
  56 #ifdef CONFIG_FB_MODE_HELPERS
  57 struct broken_edid {
  58         u8  manufacturer[4];
  59         u32 model;
  60         u32 fix;
  61 };
  62
  63 static const struct broken_edid brokendb[] = {
  64         /* DEC FR-PCXAV-YZ */
  65         {
  66                 .manufacturer = "DEC",
  67                 .model        = 0x073a,
  68                 .fix          = FBMON_FIX_HEADER,
  69         },
  70         /* ViewSonic PF775a */
  71         {
  72                 .manufacturer = "VSC",
  73                 .model        = 0x5a44,
  74                 .fix          = FBMON_FIX_INPUT,
  75         },
  76         /* Sharp UXGA? */
  77         {
  78                 .manufacturer = "SHP",
  79                 .model        = 0x138e,
  80                 .fix          = FBMON_FIX_TIMINGS,
  81         },
  82 };
  83
  84 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
  85         0xff, 0xff, 0xff, 0x00
  86 };
  87
  88 static void copy_string(unsigned char *c, unsigned char *s)
  89 {
  90   int i;
  91   c = c + 5;
  92   for (i = 0; (i < 13 && *c != 0x0A); i++)
  93     *(s++) = *(c++);
  94   *s = 0;
  95   while (i-- && (*--s == 0x20)) *s = 0;
  96 }
  97
  98 static int edid_is_serial_block(unsigned char *block)
  99 {
 100         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 101             (block[2] == 0x00) && (block[3] == 0xff) &&
 102             (block[4] == 0x00))
 103                 return 1;
 104         else
 105                 return 0;
 106 }
 107
 108 static int edid_is_ascii_block(unsigned char *block)
 109 {
 110         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 111             (block[2] == 0x00) && (block[3] == 0xfe) &&
 112             (block[4] == 0x00))
 113                 return 1;
 114         else
 115                 return 0;
 116 }
 117
 118 static int edid_is_limits_block(unsigned char *block)
 119 {
 120         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 121             (block[2] == 0x00) && (block[3] == 0xfd) &&
 122             (block[4] == 0x00))
 123                 return 1;
 124         else
 125                 return 0;
 126 }
 127
 128 static int edid_is_monitor_block(unsigned char *block)
 129 {
 130         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 131             (block[2] == 0x00) && (block[3] == 0xfc) &&
 132             (block[4] == 0x00))
 133                 return 1;
 134         else
 135                 return 0;
 136 }
 137
 138 static int edid_is_timing_block(unsigned char *block)
 139 {
 140         if ((block[0] != 0x00) || (block[1] != 0x00) ||
 141             (block[2] != 0x00) || (block[4] != 0x00))
 142                 return 1;
 143         else
 144                 return 0;
 145 }
 146
 147 static int check_edid(unsigned char *edid)
 148 {
 149         unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
 150         unsigned char *b;
 151         u32 model;
 152         int i, fix = 0, ret = 0;
 153
 154         manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 155         manufacturer[1] = ((block[0] & 0x03) << 3) +
 156                 ((block[1] & 0xe0) >> 5) + '@';
 157         manufacturer[2] = (block[1] & 0x1f) + '@';
 158         manufacturer[3] = 0;
 159         model = block[2] + (block[3] << 8);
 160
 161         for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
 162                 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
 163                         brokendb[i].model == model) {
 164                         fix = brokendb[i].fix;
 165                         break;
 166                 }
 167         }
 168
 169         switch (fix) {
 170         case FBMON_FIX_HEADER:
 171                 for (i = 0; i < 8; i++) {
 172                         if (edid[i] != edid_v1_header[i]) {
 173                                 ret = fix;
 174                                 break;
 175                         }
 176                 }
 177                 break;
 178         case FBMON_FIX_INPUT:
 179                 b = edid + EDID_STRUCT_DISPLAY;
 180                 /* Only if display is GTF capable will
 181                    the input type be reset to analog */
 182                 if (b[4] & 0x01 && b[0] & 0x80)
 183                         ret = fix;
 184                 break;
 185         case FBMON_FIX_TIMINGS:
 186                 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 187                 ret = fix;
 188
 189                 for (i = 0; i < 4; i++) {
 190                         if (edid_is_limits_block(b)) {
 191                                 ret = 0;
 192                                 break;
 193                         }
 194
 195                         b += DETAILED_TIMING_DESCRIPTION_SIZE;
 196                 }
 197
 198                 break;
 199         }
 200
 201         if (ret)
 202                 printk("fbmon: The EDID Block of "
 203                        "Manufacturer: %s Model: 0x%x is known to "
 204                        "be broken,\n",  manufacturer, model);
 205
 206         return ret;
 207 }
 208
 209 static void fix_edid(unsigned char *edid, int fix)
 210 {
 211         int i;
 212         unsigned char *b, csum = 0;
 213
 214         switch (fix) {
 215         case FBMON_FIX_HEADER:
 216                 printk("fbmon: trying a header reconstruct\n");
 217                 memcpy(edid, edid_v1_header, 8);
 218                 break;
 219         case FBMON_FIX_INPUT:
 220                 printk("fbmon: trying to fix input type\n");
 221                 b = edid + EDID_STRUCT_DISPLAY;
 222                 b[0] &= ~0x80;
 223                 edid[127] += 0x80;
 224                 break;
 225         case FBMON_FIX_TIMINGS:
 226                 printk("fbmon: trying to fix monitor timings\n");
 227                 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 228                 for (i = 0; i < 4; i++) {
 229                         if (!(edid_is_serial_block(b) ||
 230                               edid_is_ascii_block(b) ||
 231                               edid_is_monitor_block(b) ||
 232                               edid_is_timing_block(b))) {
 233                                 b[0] = 0x00;
 234                                 b[1] = 0x00;
 235                                 b[2] = 0x00;
 236                                 b[3] = 0xfd;
 237                                 b[4] = 0x00;
 238                                 b[5] = 60;   /* vfmin */
 239                                 b[6] = 60;   /* vfmax */
 240                                 b[7] = 30;   /* hfmin */
 241                                 b[8] = 75;   /* hfmax */
 242                                 b[9] = 17;   /* pixclock - 170 MHz*/
 243                                 b[10] = 0;   /* GTF */
 244                                 break;
 245                         }
 246
 247                         b += DETAILED_TIMING_DESCRIPTION_SIZE;
 248                 }
 249
 250                 for (i = 0; i < EDID_LENGTH - 1; i++)
 251                         csum += edid[i];
 252
 253                 edid[127] = 256 - csum;
 254                 break;
 255         }
 256 }
 257
 258 static int edid_checksum(unsigned char *edid)
 259 {
 260         unsigned char csum = 0, all_null = 0;
 261         int i, err = 0, fix = check_edid(edid);
 262
 263         if (fix)
 264                 fix_edid(edid, fix);
 265
 266         for (i = 0; i < EDID_LENGTH; i++) {
 267                 csum += edid[i];
 268                 all_null |= edid[i];
 269         }
 270
 271         if (csum == 0x00 && all_null) {
 272                 /* checksum passed, everything's good */
 273                 err = 1;
 274         }
 275
 276         return err;
 277 }
 278
 279 static int edid_check_header(unsigned char *edid)
 280 {
 281         int i, err = 1, fix = check_edid(edid);
 282
 283         if (fix)
 284                 fix_edid(edid, fix);
 285
 286         for (i = 0; i < 8; i++) {
 287                 if (edid[i] != edid_v1_header[i])
 288                         err = 0;
 289         }
 290
 291         return err;
 292 }
 293
 294 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
 295 {
 296         specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 297         specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
 298                 ((block[1] & 0xe0) >> 5) + '@';
 299         specs->manufacturer[2] = (block[1] & 0x1f) + '@';
 300         specs->manufacturer[3] = 0;
 301         specs->model = block[2] + (block[3] << 8);
 302         specs->serial = block[4] + (block[5] << 8) +
 303                (block[6] << 16) + (block[7] << 24);
 304         specs->year = block[9] + 1990;
 305         specs->week = block[8];
 306         DPRINTK("   Manufacturer: %s\n", specs->manufacturer);
 307         DPRINTK("   Model: %x\n", specs->model);
 308         DPRINTK("   Serial#: %u\n", specs->serial);
 309         DPRINTK("   Year: %u Week %u\n", specs->year, specs->week);
 310 }
 311
 312 static void get_dpms_capabilities(unsigned char flags,
 313                                   struct fb_monspecs *specs)
 314 {
 315         specs->dpms = 0;
 316         if (flags & DPMS_ACTIVE_OFF)
 317                 specs->dpms |= FB_DPMS_ACTIVE_OFF;
 318         if (flags & DPMS_SUSPEND)
 319                 specs->dpms |= FB_DPMS_SUSPEND;
 320         if (flags & DPMS_STANDBY)
 321                 specs->dpms |= FB_DPMS_STANDBY;
 322         DPRINTK("      DPMS: Active %s, Suspend %s, Standby %s\n",
 323                (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
 324                (flags & DPMS_SUSPEND)    ? "yes" : "no",
 325                (flags & DPMS_STANDBY)    ? "yes" : "no");
 326 }
 327
 328 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
 329 {
 330         int tmp;
 331
 332         DPRINTK("      Chroma\n");
 333         /* Chromaticity data */
 334         tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
 335         tmp *= 1000;
 336         tmp += 512;
 337         specs->chroma.redx = tmp/1024;
 338         DPRINTK("         RedX:     0.%03d ", specs->chroma.redx);
 339
 340         tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
 341         tmp *= 1000;
 342         tmp += 512;
 343         specs->chroma.redy = tmp/1024;
 344         DPRINTK("RedY:     0.%03d\n", specs->chroma.redy);
 345
 346         tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
 347         tmp *= 1000;
 348         tmp += 512;
 349         specs->chroma.greenx = tmp/1024;
 350         DPRINTK("         GreenX:   0.%03d ", specs->chroma.greenx);
 351
 352         tmp = (block[5] & 3) | (block[0xa] << 2);
 353         tmp *= 1000;
 354         tmp += 512;
 355         specs->chroma.greeny = tmp/1024;
 356         DPRINTK("GreenY:   0.%03d\n", specs->chroma.greeny);
 357
 358         tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
 359         tmp *= 1000;
 360         tmp += 512;
 361         specs->chroma.bluex = tmp/1024;
 362         DPRINTK("         BlueX:    0.%03d ", specs->chroma.bluex);
 363
 364         tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
 365         tmp *= 1000;
 366         tmp += 512;
 367         specs->chroma.bluey = tmp/1024;
 368         DPRINTK("BlueY:    0.%03d\n", specs->chroma.bluey);
 369
 370         tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
 371         tmp *= 1000;
 372         tmp += 512;
 373         specs->chroma.whitex = tmp/1024;
 374         DPRINTK("         WhiteX:   0.%03d ", specs->chroma.whitex);
 375
 376         tmp = (block[6] & 3) | (block[0xe] << 2);
 377         tmp *= 1000;
 378         tmp += 512;
 379         specs->chroma.whitey = tmp/1024;
 380         DPRINTK("WhiteY:   0.%03d\n", specs->chroma.whitey);
 381 }
 382
 383 static void calc_mode_timings(int xres, int yres, int refresh,
 384                               struct fb_videomode *mode)
 385 {
 386         struct fb_var_screeninfo *var;
 387
 388         var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
 389
 390         if (var) {
 391                 var->xres = xres;
 392                 var->yres = yres;
 393                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
 394                             refresh, var, NULL);
 395                 mode->xres = xres;
 396                 mode->yres = yres;
 397                 mode->pixclock = var->pixclock;
 398                 mode->refresh = refresh;
 399                 mode->left_margin = var->left_margin;
 400                 mode->right_margin = var->right_margin;
 401                 mode->upper_margin = var->upper_margin;
 402                 mode->lower_margin = var->lower_margin;
 403                 mode->hsync_len = var->hsync_len;
 404                 mode->vsync_len = var->vsync_len;
 405                 mode->vmode = 0;
 406                 mode->sync = 0;
 407                 kfree(var);
 408         }
 409 }
 410
 411 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
 412 {
 413         int num = 0;
 414         unsigned char c;
 415
 416         c = block[0];
 417         if (c&0x80) {
 418                 calc_mode_timings(720, 400, 70, &mode[num]);
 419                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 420                 DPRINTK("      720x400@70Hz\n");
 421         }
 422         if (c&0x40) {
 423                 calc_mode_timings(720, 400, 88, &mode[num]);
 424                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 425                 DPRINTK("      720x400@88Hz\n");
 426         }
 427         if (c&0x20) {
 428                 mode[num++] = vesa_modes[3];
 429                 DPRINTK("      640x480@60Hz\n");
 430         }
 431         if (c&0x10) {
 432                 calc_mode_timings(640, 480, 67, &mode[num]);
 433                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 434                 DPRINTK("      640x480@67Hz\n");
 435         }
 436         if (c&0x08) {
 437                 mode[num++] = vesa_modes[4];
 438                 DPRINTK("      640x480@72Hz\n");
 439         }
 440         if (c&0x04) {
 441                 mode[num++] = vesa_modes[5];
 442                 DPRINTK("      640x480@75Hz\n");
 443         }
 444         if (c&0x02) {
 445                 mode[num++] = vesa_modes[7];
 446                 DPRINTK("      800x600@56Hz\n");
 447         }
 448         if (c&0x01) {
 449                 mode[num++] = vesa_modes[8];
 450                 DPRINTK("      800x600@60Hz\n");
 451         }
 452
 453         c = block[1];
 454         if (c&0x80) {
 455                 mode[num++] = vesa_modes[9];
 456                 DPRINTK("      800x600@72Hz\n");
 457         }
 458         if (c&0x40) {
 459                 mode[num++] = vesa_modes[10];
 460                 DPRINTK("      800x600@75Hz\n");
 461         }
 462         if (c&0x20) {
 463                 calc_mode_timings(832, 624, 75, &mode[num]);
 464                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 465                 DPRINTK("      832x624@75Hz\n");
 466         }
 467         if (c&0x10) {
 468                 mode[num++] = vesa_modes[12];
 469                 DPRINTK("      1024x768@87Hz Interlaced\n");
 470         }
 471         if (c&0x08) {
 472                 mode[num++] = vesa_modes[13];
 473                 DPRINTK("      1024x768@60Hz\n");
 474         }
 475         if (c&0x04) {
 476                 mode[num++] = vesa_modes[14];
 477                 DPRINTK("      1024x768@70Hz\n");
 478         }
 479         if (c&0x02) {
 480                 mode[num++] = vesa_modes[15];
 481                 DPRINTK("      1024x768@75Hz\n");
 482         }
 483         if (c&0x01) {
 484                 mode[num++] = vesa_modes[21];
 485                 DPRINTK("      1280x1024@75Hz\n");
 486         }
 487         c = block[2];
 488         if (c&0x80) {
 489                 mode[num++] = vesa_modes[17];
 490                 DPRINTK("      1152x870@75Hz\n");
 491         }
 492         DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
 493         return num;
 494 }
 495
 496 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
 497                 int ver, int rev)
 498 {
 499         int xres, yres = 0, refresh, ratio, i;
 500
 501         xres = (block[0] + 31) * 8;
 502         if (xres <= 256)
 503                 return 0;
 504
 505         ratio = (block[1] & 0xc0) >> 6;
 506         switch (ratio) {
 507         case 0:
 508                 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
 509                 if (ver < 1 || (ver == 1 && rev < 3))
 510                         yres = xres;
 511                 else
 512                         yres = (xres * 10)/16;
 513                 break;
 514         case 1:
 515                 yres = (xres * 3)/4;
 516                 break;
 517         case 2:
 518                 yres = (xres * 4)/5;
 519                 break;
 520         case 3:
 521                 yres = (xres * 9)/16;
 522                 break;
 523         }
 524         refresh = (block[1] & 0x3f) + 60;
 525
 526         DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 527         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 528                 if (vesa_modes[i].xres == xres &&
 529                     vesa_modes[i].yres == yres &&
 530                     vesa_modes[i].refresh == refresh) {
 531                         *mode = vesa_modes[i];
 532                         mode->flag |= FB_MODE_IS_STANDARD;
 533                         return 1;
 534                 }
 535         }
 536         calc_mode_timings(xres, yres, refresh, mode);
 537         return 1;
 538 }
 539
 540 static int get_dst_timing(unsigned char *block,
 541                           struct fb_videomode *mode, int ver, int rev)
 542 {
 543         int j, num = 0;
 544
 545         for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
 546                 num += get_std_timing(block, &mode[num], ver, rev);
 547
 548         return num;
 549 }
 550
 551 static void get_detailed_timing(unsigned char *block,
 552                                 struct fb_videomode *mode)
 553 {
 554         mode->xres = H_ACTIVE;
 555         mode->yres = V_ACTIVE;
 556         mode->pixclock = PIXEL_CLOCK;
 557         mode->pixclock /= 1000;
 558         mode->pixclock = KHZ2PICOS(mode->pixclock);
 559         mode->right_margin = H_SYNC_OFFSET;
 560         mode->left_margin = (H_ACTIVE + H_BLANKING) -
 561                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 562         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 563                 V_SYNC_WIDTH;
 564         mode->lower_margin = V_SYNC_OFFSET;
 565         mode->hsync_len = H_SYNC_WIDTH;
 566         mode->vsync_len = V_SYNC_WIDTH;
 567         if (HSYNC_POSITIVE)
 568                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 569         if (VSYNC_POSITIVE)
 570                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 571         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 572                                      (V_ACTIVE + V_BLANKING));
 573         if (INTERLACED) {
 574                 mode->yres *= 2;
 575                 mode->upper_margin *= 2;
 576                 mode->lower_margin *= 2;
 577                 mode->vsync_len *= 2;
 578                 mode->vmode |= FB_VMODE_INTERLACED;
 579         }
 580         mode->flag = FB_MODE_IS_DETAILED;
 581
 582         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 583         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 584                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 585         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 586                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 587         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 588                (VSYNC_POSITIVE) ? "+" : "-");
 589 }
 590
 591 /**
 592  * fb_create_modedb - create video mode database
 593  * @edid: EDID data
 594  * @dbsize: database size
 595  *
 596  * RETURNS: struct fb_videomode, @dbsize contains length of database
 597  *
 598  * DESCRIPTION:
 599  * This function builds a mode database using the contents of the EDID
 600  * data
 601  */
 602 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 603 {
 604         struct fb_videomode *mode, *m;
 605         unsigned char *block;
 606         int num = 0, i, first = 1;
 607         int ver, rev;
 608
 609         ver = edid[EDID_STRUCT_VERSION];
 610         rev = edid[EDID_STRUCT_REVISION];
 611
 612         mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 613         if (mode == NULL)
 614                 return NULL;
 615
 616         if (edid == NULL || !edid_checksum(edid) ||
 617             !edid_check_header(edid)) {
 618                 kfree(mode);
 619                 return NULL;
 620         }
 621
 622         *dbsize = 0;
 623
 624         DPRINTK("   Detailed Timings\n");
 625         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 626         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 627                 if (!(block[0] == 0x00 && block[1] == 0x00)) {
 628                         get_detailed_timing(block, &mode[num]);
 629                         if (first) {
 630                                 mode[num].flag |= FB_MODE_IS_FIRST;
 631                                 first = 0;
 632                         }
 633                         num++;
 634                 }
 635         }
 636
 637         DPRINTK("   Supported VESA Modes\n");
 638         block = edid + ESTABLISHED_TIMING_1;
 639         num += get_est_timing(block, &mode[num]);
 640
 641         DPRINTK("   Standard Timings\n");
 642         block = edid + STD_TIMING_DESCRIPTIONS_START;
 643         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 644                 num += get_std_timing(block, &mode[num], ver, rev);
 645
 646         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 647         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 648                 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 649                         num += get_dst_timing(block + 5, &mode[num], ver, rev);
 650         }
 651
 652         /* Yikes, EDID data is totally useless */
 653         if (!num) {
 654                 kfree(mode);
 655                 return NULL;
 656         }
 657
 658         *dbsize = num;
 659         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 660         if (!m)
 661                 return mode;
 662         memmove(m, mode, num * sizeof(struct fb_videomode));
 663         kfree(mode);
 664         return m;
 665 }
 666
 667 /**
 668  * fb_destroy_modedb - destroys mode database
 669  * @modedb: mode database to destroy
 670  *
 671  * DESCRIPTION:
 672  * Destroy mode database created by fb_create_modedb
 673  */
 674 void fb_destroy_modedb(struct fb_videomode *modedb)
 675 {
 676         kfree(modedb);
 677 }
 678
 679 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 680 {
 681         int i, retval = 1;
 682         unsigned char *block;
 683
 684         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 685
 686         DPRINTK("      Monitor Operating Limits: ");
 687
 688         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 689                 if (edid_is_limits_block(block)) {
 690                         specs->hfmin = H_MIN_RATE * 1000;
 691                         specs->hfmax = H_MAX_RATE * 1000;
 692                         specs->vfmin = V_MIN_RATE;
 693                         specs->vfmax = V_MAX_RATE;
 694                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 695                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 696                         retval = 0;
 697                         DPRINTK("From EDID\n");
 698                         break;
 699                 }
 700         }
 701
 702         /* estimate monitor limits based on modes supported */
 703         if (retval) {
 704                 struct fb_videomode *modes, *mode;
 705                 int num_modes, hz, hscan, pixclock;
 706                 int vtotal, htotal;
 707
 708                 modes = fb_create_modedb(edid, &num_modes);
 709                 if (!modes) {
 710                         DPRINTK("None Available\n");
 711                         return 1;
 712                 }
 713
 714                 retval = 0;
 715                 for (i = 0; i < num_modes; i++) {
 716                         mode = &modes[i];
 717                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 718                         htotal = mode->xres + mode->right_margin + mode->hsync_len
 719                                 + mode->left_margin;
 720                         vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 721                                 + mode->upper_margin;
 722
 723                         if (mode->vmode & FB_VMODE_INTERLACED)
 724                                 vtotal /= 2;
 725
 726                         if (mode->vmode & FB_VMODE_DOUBLE)
 727                                 vtotal *= 2;
 728
 729                         hscan = (pixclock + htotal / 2) / htotal;
 730                         hscan = (hscan + 500) / 1000 * 1000;
 731                         hz = (hscan + vtotal / 2) / vtotal;
 732
 733                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 734                                 specs->dclkmax = pixclock;
 735
 736                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 737                                 specs->dclkmin = pixclock;
 738
 739                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 740                                 specs->hfmax = hscan;
 741
 742                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 743                                 specs->hfmin = hscan;
 744
 745                         if (specs->vfmax == 0 || specs->vfmax < hz)
 746                                 specs->vfmax = hz;
 747
 748                         if (specs->vfmin == 0 || specs->vfmin > hz)
 749                                 specs->vfmin = hz;
 750                 }
 751                 DPRINTK("Extrapolated\n");
 752                 fb_destroy_modedb(modes);
 753         }
 754         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 755                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 756                 specs->vfmax, specs->dclkmax/1000000);
 757         return retval;
 758 }
 759
 760 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 761 {
 762         unsigned char c, *block;
 763
 764         block = edid + EDID_STRUCT_DISPLAY;
 765
 766         fb_get_monitor_limits(edid, specs);
 767
 768         c = block[0] & 0x80;
 769         specs->input = 0;
 770         if (c) {
 771                 specs->input |= FB_DISP_DDI;
 772                 DPRINTK("      Digital Display Input");
 773         } else {
 774                 DPRINTK("      Analog Display Input: Input Voltage - ");
 775                 switch ((block[0] & 0x60) >> 5) {
 776                 case 0:
 777                         DPRINTK("0.700V/0.300V");
 778                         specs->input |= FB_DISP_ANA_700_300;
 779                         break;
 780                 case 1:
 781                         DPRINTK("0.714V/0.286V");
 782                         specs->input |= FB_DISP_ANA_714_286;
 783                         break;
 784                 case 2:
 785                         DPRINTK("1.000V/0.400V");
 786                         specs->input |= FB_DISP_ANA_1000_400;
 787                         break;
 788                 case 3:
 789                         DPRINTK("0.700V/0.000V");
 790                         specs->input |= FB_DISP_ANA_700_000;
 791                         break;
 792                 }
 793         }
 794         DPRINTK("\n      Sync: ");
 795         c = block[0] & 0x10;
 796         if (c)
 797                 DPRINTK("      Configurable signal level\n");
 798         c = block[0] & 0x0f;
 799         specs->signal = 0;
 800         if (c & 0x10) {
 801                 DPRINTK("Blank to Blank ");
 802                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 803         }
 804         if (c & 0x08) {
 805                 DPRINTK("Separate ");
 806                 specs->signal |= FB_SIGNAL_SEPARATE;
 807         }
 808         if (c & 0x04) {
 809                 DPRINTK("Composite ");
 810                 specs->signal |= FB_SIGNAL_COMPOSITE;
 811         }
 812         if (c & 0x02) {
 813                 DPRINTK("Sync on Green ");
 814                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 815         }
 816         if (c & 0x01) {
 817                 DPRINTK("Serration on ");
 818                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 819         }
 820         DPRINTK("\n");
 821         specs->max_x = block[1];
 822         specs->max_y = block[2];
 823         DPRINTK("      Max H-size in cm: ");
 824         if (specs->max_x)
 825                 DPRINTK("%d\n", specs->max_x);
 826         else
 827                 DPRINTK("variable\n");
 828         DPRINTK("      Max V-size in cm: ");
 829         if (specs->max_y)
 830                 DPRINTK("%d\n", specs->max_y);
 831         else
 832                 DPRINTK("variable\n");
 833
 834         c = block[3];
 835         specs->gamma = c+100;
 836         DPRINTK("      Gamma: ");
 837         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 838
 839         get_dpms_capabilities(block[4], specs);
 840
 841         switch ((block[4] & 0x18) >> 3) {
 842         case 0:
 843                 DPRINTK("      Monochrome/Grayscale\n");
 844                 specs->input |= FB_DISP_MONO;
 845                 break;
 846         case 1:
 847                 DPRINTK("      RGB Color Display\n");
 848                 specs->input |= FB_DISP_RGB;
 849                 break;
 850         case 2:
 851                 DPRINTK("      Non-RGB Multicolor Display\n");
 852                 specs->input |= FB_DISP_MULTI;
 853                 break;
 854         default:
 855                 DPRINTK("      Unknown\n");
 856                 specs->input |= FB_DISP_UNKNOWN;
 857                 break;
 858         }
 859
 860         get_chroma(block, specs);
 861
 862         specs->misc = 0;
 863         c = block[4] & 0x7;
 864         if (c & 0x04) {
 865                 DPRINTK("      Default color format is primary\n");
 866                 specs->misc |= FB_MISC_PRIM_COLOR;
 867         }
 868         if (c & 0x02) {
 869                 DPRINTK("      First DETAILED Timing is preferred\n");
 870                 specs->misc |= FB_MISC_1ST_DETAIL;
 871         }
 872         if (c & 0x01) {
 873                 printk("      Display is GTF capable\n");
 874                 specs->gtf = 1;
 875         }
 876 }
 877
 878 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 879 {
 880         int i;
 881         unsigned char *block;
 882
 883         if (edid == NULL || var == NULL)
 884                 return 1;
 885
 886         if (!(edid_checksum(edid)))
 887                 return 1;
 888
 889         if (!(edid_check_header(edid)))
 890                 return 1;
 891
 892         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 893
 894         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 895                 if (edid_is_timing_block(block)) {
 896                         var->xres = var->xres_virtual = H_ACTIVE;
 897                         var->yres = var->yres_virtual = V_ACTIVE;
 898                         var->height = var->width = 0;
 899                         var->right_margin = H_SYNC_OFFSET;
 900                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 901                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 902                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 903                                 V_SYNC_WIDTH;
 904                         var->lower_margin = V_SYNC_OFFSET;
 905                         var->hsync_len = H_SYNC_WIDTH;
 906                         var->vsync_len = V_SYNC_WIDTH;
 907                         var->pixclock = PIXEL_CLOCK;
 908                         var->pixclock /= 1000;
 909                         var->pixclock = KHZ2PICOS(var->pixclock);
 910
 911                         if (HSYNC_POSITIVE)
 912                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 913                         if (VSYNC_POSITIVE)
 914                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 915                         return 0;
 916                 }
 917         }
 918         return 1;
 919 }
 920
 921 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 922 {
 923         unsigned char *block;
 924         int i, found = 0;
 925
 926         if (edid == NULL)
 927                 return;
 928
 929         if (!(edid_checksum(edid)))
 930                 return;
 931
 932         if (!(edid_check_header(edid)))
 933                 return;
 934
 935         memset(specs, 0, sizeof(struct fb_monspecs));
 936
 937         specs->version = edid[EDID_STRUCT_VERSION];
 938         specs->revision = edid[EDID_STRUCT_REVISION];
 939
 940         DPRINTK("========================================\n");
 941         DPRINTK("Display Information (EDID)\n");
 942         DPRINTK("========================================\n");
 943         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 944                (int) specs->revision);
 945
 946         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 947
 948         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 949         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 950                 if (edid_is_serial_block(block)) {
 951                         copy_string(block, specs->serial_no);
 952                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 953                 } else if (edid_is_ascii_block(block)) {
 954                         copy_string(block, specs->ascii);
 955                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 956                 } else if (edid_is_monitor_block(block)) {
 957                         copy_string(block, specs->monitor);
 958                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 959                 }
 960         }
 961
 962         DPRINTK("   Display Characteristics:\n");
 963         get_monspecs(edid, specs);
 964
 965         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 966
 967         /*
 968          * Workaround for buggy EDIDs that sets that the first
 969          * detailed timing is preferred but has not detailed
 970          * timing specified
 971          */
 972         for (i = 0; i < specs->modedb_len; i++) {
 973                 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 974                         found = 1;
 975                         break;
 976                 }
 977         }
 978
 979         if (!found)
 980                 specs->misc &= ~FB_MISC_1ST_DETAIL;
 981
 982         DPRINTK("========================================\n");
 983 }
 984
 985 /**
 986  * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
 987  * @edid:       128 byte array with an E-EDID block
 988  * @spacs:      monitor specs to be extended
 989  */
 990 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 991 {
 992         unsigned char *block;
 993         struct fb_videomode *m;
 994         int num = 0, i;
 995         u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
 996         u8 pos = 4, svd_n = 0;
 997
 998         if (!edid)
 999                 return;
1000
1001         if (!edid_checksum(edid))
1002                 return;
1003
1004         if (edid[0] != 0x2 ||
1005             edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1006                 return;
1007
1008         DPRINTK("  Short Video Descriptors\n");
1009
1010         while (pos < edid[2]) {
1011                 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1012                 pr_debug("Data block %u of %u bytes\n", type, len);
1013                 if (type == 2)
1014                         for (i = pos; i < pos + len; i++) {
1015                                 u8 idx = edid[pos + i] & 0x7f;
1016                                 svd[svd_n++] = idx;
1017                                 pr_debug("N%sative mode #%d\n",
1018                                          edid[pos + i] & 0x80 ? "" : "on-n", idx);
1019                         }
1020                 pos += len + 1;
1021         }
1022
1023         block = edid + edid[2];
1024
1025         DPRINTK("  Extended Detailed Timings\n");
1026
1027         for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1028              i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1029                 if (PIXEL_CLOCK)
1030                         edt[num++] = block - edid;
1031
1032         /* Yikes, EDID data is totally useless */
1033         if (!(num + svd_n))
1034                 return;
1035
1036         m = kzalloc((specs->modedb_len + num + svd_n) *
1037                        sizeof(struct fb_videomode), GFP_KERNEL);
1038
1039         if (!m)
1040                 return;
1041
1042         memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1043
1044         for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1045                 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1046                 if (i == specs->modedb_len)
1047                         m[i].flag |= FB_MODE_IS_FIRST;
1048                 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1049         }
1050
1051         for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1052                 int idx = svd[i - specs->modedb_len - num];
1053                 if (!idx || idx > 63) {
1054                         pr_warning("Reserved SVD code %d\n", idx);
1055                 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1056                         pr_warning("Unimplemented SVD code %d\n", idx);
1057                 } else {
1058                         memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1059                         pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1060                                  m[i].xres, m[i].yres, m[i].refresh);
1061                 }
1062         }
1063
1064         kfree(specs->modedb);
1065         specs->modedb = m;
1066         specs->modedb_len = specs->modedb_len + num + svd_n;
1067 }
1068
1069 /*
1070  * VESA Generalized Timing Formula (GTF)
1071  */
1072
1073 #define FLYBACK                     550
1074 #define V_FRONTPORCH                1
1075 #define H_OFFSET                    40
1076 #define H_SCALEFACTOR               20
1077 #define H_BLANKSCALE                128
1078 #define H_GRADIENT                  600
1079 #define C_VAL                       30
1080 #define M_VAL                       300
1081
1082 struct __fb_timings {
1083         u32 dclk;
1084         u32 hfreq;
1085         u32 vfreq;
1086         u32 hactive;
1087         u32 vactive;
1088         u32 hblank;
1089         u32 vblank;
1090         u32 htotal;
1091         u32 vtotal;
1092 };
1093
1094 /**
1095  * fb_get_vblank - get vertical blank time
1096  * @hfreq: horizontal freq
1097  *
1098  * DESCRIPTION:
1099  * vblank = right_margin + vsync_len + left_margin
1100  *
1101  *    given: right_margin = 1 (V_FRONTPORCH)
1102  *           vsync_len    = 3
1103  *           flyback      = 550
1104  *
1105  *                          flyback * hfreq
1106  *           left_margin  = --------------- - vsync_len
1107  *                           1000000
1108  */
1109 static u32 fb_get_vblank(u32 hfreq)
1110 {
1111         u32 vblank;
1112
1113         vblank = (hfreq * FLYBACK)/1000;
1114         vblank = (vblank + 500)/1000;
1115         return (vblank + V_FRONTPORCH);
1116 }
1117
1118 /**
1119  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1120  * @hfreq: horizontal freq
1121  * @xres: horizontal resolution in pixels
1122  *
1123  * DESCRIPTION:
1124  *
1125  *           xres * duty_cycle
1126  * hblank = ------------------
1127  *           100 - duty_cycle
1128  *
1129  * duty cycle = percent of htotal assigned to inactive display
1130  * duty cycle = C - (M/Hfreq)
1131  *
1132  * where: C = ((offset - scale factor) * blank_scale)
1133  *            -------------------------------------- + scale factor
1134  *                        256
1135  *        M = blank_scale * gradient
1136  *
1137  */
1138 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1139 {
1140         u32 c_val, m_val, duty_cycle, hblank;
1141
1142         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1143                  H_SCALEFACTOR) * 1000;
1144         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1145         m_val = (m_val * 1000000)/hfreq;
1146         duty_cycle = c_val - m_val;
1147         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1148         return (hblank);
1149 }
1150
1151 /**
1152  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1153  * @dclk: pixelclock in Hz
1154  * @xres: horizontal resolution in pixels
1155  *
1156  * DESCRIPTION:
1157  *
1158  *           xres * duty_cycle
1159  * hblank = ------------------
1160  *           100 - duty_cycle
1161  *
1162  * duty cycle = percent of htotal assigned to inactive display
1163  * duty cycle = C - (M * h_period)
1164  *
1165  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1166  *                   -----------------------------------------------
1167  *                                    2 * M
1168  *        M = 300;
1169  *        C = 30;
1170
1171  */
1172 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1173 {
1174         u32 duty_cycle, h_period, hblank;
1175
1176         dclk /= 1000;
1177         h_period = 100 - C_VAL;
1178         h_period *= h_period;
1179         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1180         h_period *= 10000;
1181
1182         h_period = int_sqrt(h_period);
1183         h_period -= (100 - C_VAL) * 100;
1184         h_period *= 1000;
1185         h_period /= 2 * M_VAL;
1186
1187         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1188         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1189         hblank &= ~15;
1190         return (hblank);
1191 }
1192
1193 /**
1194  * fb_get_hfreq - estimate hsync
1195  * @vfreq: vertical refresh rate
1196  * @yres: vertical resolution
1197  *
1198  * DESCRIPTION:
1199  *
1200  *          (yres + front_port) * vfreq * 1000000
1201  * hfreq = -------------------------------------
1202  *          (1000000 - (vfreq * FLYBACK)
1203  *
1204  */
1205
1206 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1207 {
1208         u32 divisor, hfreq;
1209
1210         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1211         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1212         return (hfreq/divisor);
1213 }
1214
1215 static void fb_timings_vfreq(struct __fb_timings *timings)
1216 {
1217         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1218         timings->vblank = fb_get_vblank(timings->hfreq);
1219         timings->vtotal = timings->vactive + timings->vblank;
1220         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1221                                                  timings->hactive);
1222         timings->htotal = timings->hactive + timings->hblank;
1223         timings->dclk = timings->htotal * timings->hfreq;
1224 }
1225
1226 static void fb_timings_hfreq(struct __fb_timings *timings)
1227 {
1228         timings->vblank = fb_get_vblank(timings->hfreq);
1229         timings->vtotal = timings->vactive + timings->vblank;
1230         timings->vfreq = timings->hfreq/timings->vtotal;
1231         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1232                                                  timings->hactive);
1233         timings->htotal = timings->hactive + timings->hblank;
1234         timings->dclk = timings->htotal * timings->hfreq;
1235 }
1236
1237 static void fb_timings_dclk(struct __fb_timings *timings)
1238 {
1239         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1240                                                 timings->hactive);
1241         timings->htotal = timings->hactive + timings->hblank;
1242         timings->hfreq = timings->dclk/timings->htotal;
1243         timings->vblank = fb_get_vblank(timings->hfreq);
1244         timings->vtotal = timings->vactive + timings->vblank;
1245         timings->vfreq = timings->hfreq/timings->vtotal;
1246 }
1247
1248 /*
1249  * fb_get_mode - calculates video mode using VESA GTF
1250  * @flags: if: 0 - maximize vertical refresh rate
1251  *             1 - vrefresh-driven calculation;
1252  *             2 - hscan-driven calculation;
1253  *             3 - pixelclock-driven calculation;
1254  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1255  * @var: pointer to fb_var_screeninfo
1256  * @info: pointer to fb_info
1257  *
1258  * DESCRIPTION:
1259  * Calculates video mode based on monitor specs using VESA GTF.
1260  * The GTF is best for VESA GTF compliant monitors but is
1261  * specifically formulated to work for older monitors as well.
1262  *
1263  * If @flag==0, the function will attempt to maximize the
1264  * refresh rate.  Otherwise, it will calculate timings based on
1265  * the flag and accompanying value.
1266  *
1267  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1268  * ignored and @var will be filled with the calculated timings.
1269  *
1270  * All calculations are based on the VESA GTF Spreadsheet
1271  * available at VESA's public ftp (http://www.vesa.org).
1272  *
1273  * NOTES:
1274  * The timings generated by the GTF will be different from VESA
1275  * DMT.  It might be a good idea to keep a table of standard
1276  * VESA modes as well.  The GTF may also not work for some displays,
1277  * such as, and especially, analog TV.
1278  *
1279  * REQUIRES:
1280  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1281  */
1282 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1283 {
1284         struct __fb_timings *timings;
1285         u32 interlace = 1, dscan = 1;
1286         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1287
1288
1289         timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1290
1291         if (!timings)
1292                 return -ENOMEM;
1293
1294         /*
1295          * If monspecs are invalid, use values that are enough
1296          * for 640x480@60
1297          */
1298         if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1299             !info->monspecs.dclkmax ||
1300             info->monspecs.hfmax < info->monspecs.hfmin ||
1301             info->monspecs.vfmax < info->monspecs.vfmin ||
1302             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1303                 hfmin = 29000; hfmax = 30000;
1304                 vfmin = 60; vfmax = 60;
1305                 dclkmin = 0; dclkmax = 25000000;
1306         } else {
1307                 hfmin = info->monspecs.hfmin;
1308                 hfmax = info->monspecs.hfmax;
1309                 vfmin = info->monspecs.vfmin;
1310                 vfmax = info->monspecs.vfmax;
1311                 dclkmin = info->monspecs.dclkmin;
1312                 dclkmax = info->monspecs.dclkmax;
1313         }
1314
1315         timings->hactive = var->xres;
1316         timings->vactive = var->yres;
1317         if (var->vmode & FB_VMODE_INTERLACED) {
1318                 timings->vactive /= 2;
1319                 interlace = 2;
1320         }
1321         if (var->vmode & FB_VMODE_DOUBLE) {
1322                 timings->vactive *= 2;
1323                 dscan = 2;
1324         }
1325
1326         switch (flags & ~FB_IGNOREMON) {
1327         case FB_MAXTIMINGS: /* maximize refresh rate */
1328                 timings->hfreq = hfmax;
1329                 fb_timings_hfreq(timings);
1330                 if (timings->vfreq > vfmax) {
1331                         timings->vfreq = vfmax;
1332                         fb_timings_vfreq(timings);
1333                 }
1334                 if (timings->dclk > dclkmax) {
1335                         timings->dclk = dclkmax;
1336                         fb_timings_dclk(timings);
1337                 }
1338                 break;
1339         case FB_VSYNCTIMINGS: /* vrefresh driven */
1340                 timings->vfreq = val;
1341                 fb_timings_vfreq(timings);
1342                 break;
1343         case FB_HSYNCTIMINGS: /* hsync driven */
1344                 timings->hfreq = val;
1345                 fb_timings_hfreq(timings);
1346                 break;
1347         case FB_DCLKTIMINGS: /* pixelclock driven */
1348                 timings->dclk = PICOS2KHZ(val) * 1000;
1349                 fb_timings_dclk(timings);
1350                 break;
1351         default:
1352                 err = -EINVAL;
1353
1354         }
1355
1356         if (err || (!(flags & FB_IGNOREMON) &&
1357             (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1358              timings->hfreq < hfmin || timings->hfreq > hfmax ||
1359              timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1360                 err = -EINVAL;
1361         } else {
1362                 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1363                 var->hsync_len = (timings->htotal * 8)/100;
1364                 var->right_margin = (timings->hblank/2) - var->hsync_len;
1365                 var->left_margin = timings->hblank - var->right_margin -
1366                         var->hsync_len;
1367                 var->vsync_len = (3 * interlace)/dscan;
1368                 var->lower_margin = (1 * interlace)/dscan;
1369                 var->upper_margin = (timings->vblank * interlace)/dscan -
1370                         (var->vsync_len + var->lower_margin);
1371         }
1372
1373         kfree(timings);
1374         return err;
1375 }
1376 #else
1377 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1378 {
1379         return 1;
1380 }
1381 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1382 {
1383         specs = NULL;
1384 }
1385 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1386 {
1387 }
1388 void fb_destroy_modedb(struct fb_videomode *modedb)
1389 {
1390 }
1391 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1392                 struct fb_info *info)
1393 {
1394         return -EINVAL;
1395 }
1396 #endif /* CONFIG_FB_MODE_HELPERS */
1397
1398 /*
1399  * fb_validate_mode - validates var against monitor capabilities
1400  * @var: pointer to fb_var_screeninfo
1401  * @info: pointer to fb_info
1402  *
1403  * DESCRIPTION:
1404  * Validates video mode against monitor capabilities specified in
1405  * info->monspecs.
1406  *
1407  * REQUIRES:
1408  * A valid info->monspecs.
1409  */
1410 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1411 {
1412         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1413         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1414
1415         /*
1416          * If monspecs are invalid, use values that are enough
1417          * for 640x480@60
1418          */
1419         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1420             !info->monspecs.dclkmax ||
1421             info->monspecs.hfmax < info->monspecs.hfmin ||
1422             info->monspecs.vfmax < info->monspecs.vfmin ||
1423             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1424                 hfmin = 29000; hfmax = 30000;
1425                 vfmin = 60; vfmax = 60;
1426                 dclkmin = 0; dclkmax = 25000000;
1427         } else {
1428                 hfmin = info->monspecs.hfmin;
1429                 hfmax = info->monspecs.hfmax;
1430                 vfmin = info->monspecs.vfmin;
1431                 vfmax = info->monspecs.vfmax;
1432                 dclkmin = info->monspecs.dclkmin;
1433                 dclkmax = info->monspecs.dclkmax;
1434         }
1435
1436         if (!var->pixclock)
1437                 return -EINVAL;
1438         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1439
1440         htotal = var->xres + var->right_margin + var->hsync_len +
1441                 var->left_margin;
1442         vtotal = var->yres + var->lower_margin + var->vsync_len +
1443                 var->upper_margin;
1444
1445         if (var->vmode & FB_VMODE_INTERLACED)
1446                 vtotal /= 2;
1447         if (var->vmode & FB_VMODE_DOUBLE)
1448                 vtotal *= 2;
1449
1450         hfreq = pixclock/htotal;
1451         hfreq = (hfreq + 500) / 1000 * 1000;
1452
1453         vfreq = hfreq/vtotal;
1454
1455         return (vfreq < vfmin || vfreq > vfmax ||
1456                 hfreq < hfmin || hfreq > hfmax ||
1457                 pixclock < dclkmin || pixclock > dclkmax) ?
1458                 -EINVAL : 0;
1459 }
1460
1461 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1462
1463 /*
1464  * We need to ensure that the EDID block is only returned for
1465  * the primary graphics adapter.
1466  */
1467
1468 const unsigned char *fb_firmware_edid(struct device *device)
1469 {
1470         struct pci_dev *dev = NULL;
1471         struct resource *res = NULL;
1472         unsigned char *edid = NULL;
1473
1474         if (device)
1475                 dev = to_pci_dev(device);
1476
1477         if (dev)
1478                 res = &dev->resource[PCI_ROM_RESOURCE];
1479
1480         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1481                 edid = edid_info.dummy;
1482
1483         return edid;
1484 }
1485 #else
1486 const unsigned char *fb_firmware_edid(struct device *device)
1487 {
1488         return NULL;
1489 }
1490 #endif
1491 EXPORT_SYMBOL(fb_firmware_edid);
1492
1493 EXPORT_SYMBOL(fb_parse_edid);
1494 EXPORT_SYMBOL(fb_edid_to_monspecs);
1495 EXPORT_SYMBOL(fb_edid_add_monspecs);
1496 EXPORT_SYMBOL(fb_get_mode);
1497 EXPORT_SYMBOL(fb_validate_mode);
1498 EXPORT_SYMBOL(fb_destroy_modedb);