drivers/video/fbdev/core/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 #include <video/of_videomode.h>
  35 #include <video/videomode.h>
  36 #ifdef CONFIG_PPC_OF
  37 #include <asm/prom.h>
  38 #include <asm/pci-bridge.h>
  39 #endif
  40 #include "../edid.h"
  41
  42 /*
  43  * EDID parser
  44  */
  45
  46 #undef DEBUG  /* define this for verbose EDID parsing output */
  47
  48 #ifdef DEBUG
  49 #define DPRINTK(fmt, args...) printk(fmt,## args)
  50 #else
  51 #define DPRINTK(fmt, args...)
  52 #endif
  53
  54 #define FBMON_FIX_HEADER  1
  55 #define FBMON_FIX_INPUT   2
  56 #define FBMON_FIX_TIMINGS 3
  57
  58 #ifdef CONFIG_FB_MODE_HELPERS
  59 struct broken_edid {
  60         u8  manufacturer[4];
  61         u32 model;
  62         u32 fix;
  63 };
  64
  65 static const struct broken_edid brokendb[] = {
  66         /* DEC FR-PCXAV-YZ */
  67         {
  68                 .manufacturer = "DEC",
  69                 .model        = 0x073a,
  70                 .fix          = FBMON_FIX_HEADER,
  71         },
  72         /* ViewSonic PF775a */
  73         {
  74                 .manufacturer = "VSC",
  75                 .model        = 0x5a44,
  76                 .fix          = FBMON_FIX_INPUT,
  77         },
  78         /* Sharp UXGA? */
  79         {
  80                 .manufacturer = "SHP",
  81                 .model        = 0x138e,
  82                 .fix          = FBMON_FIX_TIMINGS,
  83         },
  84 };
  85
  86 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
  87         0xff, 0xff, 0xff, 0x00
  88 };
  89
  90 static void copy_string(unsigned char *c, unsigned char *s)
  91 {
  92   int i;
  93   c = c + 5;
  94   for (i = 0; (i < 13 && *c != 0x0A); i++)
  95     *(s++) = *(c++);
  96   *s = 0;
  97   while (i-- && (*--s == 0x20)) *s = 0;
  98 }
  99
 100 static int edid_is_serial_block(unsigned char *block)
 101 {
 102         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 103             (block[2] == 0x00) && (block[3] == 0xff) &&
 104             (block[4] == 0x00))
 105                 return 1;
 106         else
 107                 return 0;
 108 }
 109
 110 static int edid_is_ascii_block(unsigned char *block)
 111 {
 112         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 113             (block[2] == 0x00) && (block[3] == 0xfe) &&
 114             (block[4] == 0x00))
 115                 return 1;
 116         else
 117                 return 0;
 118 }
 119
 120 static int edid_is_limits_block(unsigned char *block)
 121 {
 122         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 123             (block[2] == 0x00) && (block[3] == 0xfd) &&
 124             (block[4] == 0x00))
 125                 return 1;
 126         else
 127                 return 0;
 128 }
 129
 130 static int edid_is_monitor_block(unsigned char *block)
 131 {
 132         if ((block[0] == 0x00) && (block[1] == 0x00) &&
 133             (block[2] == 0x00) && (block[3] == 0xfc) &&
 134             (block[4] == 0x00))
 135                 return 1;
 136         else
 137                 return 0;
 138 }
 139
 140 static int edid_is_timing_block(unsigned char *block)
 141 {
 142         if ((block[0] != 0x00) || (block[1] != 0x00) ||
 143             (block[2] != 0x00) || (block[4] != 0x00))
 144                 return 1;
 145         else
 146                 return 0;
 147 }
 148
 149 static int check_edid(unsigned char *edid)
 150 {
 151         unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
 152         unsigned char *b;
 153         u32 model;
 154         int i, fix = 0, ret = 0;
 155
 156         manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 157         manufacturer[1] = ((block[0] & 0x03) << 3) +
 158                 ((block[1] & 0xe0) >> 5) + '@';
 159         manufacturer[2] = (block[1] & 0x1f) + '@';
 160         manufacturer[3] = 0;
 161         model = block[2] + (block[3] << 8);
 162
 163         for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
 164                 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
 165                         brokendb[i].model == model) {
 166                         fix = brokendb[i].fix;
 167                         break;
 168                 }
 169         }
 170
 171         switch (fix) {
 172         case FBMON_FIX_HEADER:
 173                 for (i = 0; i < 8; i++) {
 174                         if (edid[i] != edid_v1_header[i]) {
 175                                 ret = fix;
 176                                 break;
 177                         }
 178                 }
 179                 break;
 180         case FBMON_FIX_INPUT:
 181                 b = edid + EDID_STRUCT_DISPLAY;
 182                 /* Only if display is GTF capable will
 183                    the input type be reset to analog */
 184                 if (b[4] & 0x01 && b[0] & 0x80)
 185                         ret = fix;
 186                 break;
 187         case FBMON_FIX_TIMINGS:
 188                 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 189                 ret = fix;
 190
 191                 for (i = 0; i < 4; i++) {
 192                         if (edid_is_limits_block(b)) {
 193                                 ret = 0;
 194                                 break;
 195                         }
 196
 197                         b += DETAILED_TIMING_DESCRIPTION_SIZE;
 198                 }
 199
 200                 break;
 201         }
 202
 203         if (ret)
 204                 printk("fbmon: The EDID Block of "
 205                        "Manufacturer: %s Model: 0x%x is known to "
 206                        "be broken,\n",  manufacturer, model);
 207
 208         return ret;
 209 }
 210
 211 static void fix_edid(unsigned char *edid, int fix)
 212 {
 213         int i;
 214         unsigned char *b, csum = 0;
 215
 216         switch (fix) {
 217         case FBMON_FIX_HEADER:
 218                 printk("fbmon: trying a header reconstruct\n");
 219                 memcpy(edid, edid_v1_header, 8);
 220                 break;
 221         case FBMON_FIX_INPUT:
 222                 printk("fbmon: trying to fix input type\n");
 223                 b = edid + EDID_STRUCT_DISPLAY;
 224                 b[0] &= ~0x80;
 225                 edid[127] += 0x80;
 226                 break;
 227         case FBMON_FIX_TIMINGS:
 228                 printk("fbmon: trying to fix monitor timings\n");
 229                 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 230                 for (i = 0; i < 4; i++) {
 231                         if (!(edid_is_serial_block(b) ||
 232                               edid_is_ascii_block(b) ||
 233                               edid_is_monitor_block(b) ||
 234                               edid_is_timing_block(b))) {
 235                                 b[0] = 0x00;
 236                                 b[1] = 0x00;
 237                                 b[2] = 0x00;
 238                                 b[3] = 0xfd;
 239                                 b[4] = 0x00;
 240                                 b[5] = 60;   /* vfmin */
 241                                 b[6] = 60;   /* vfmax */
 242                                 b[7] = 30;   /* hfmin */
 243                                 b[8] = 75;   /* hfmax */
 244                                 b[9] = 17;   /* pixclock - 170 MHz*/
 245                                 b[10] = 0;   /* GTF */
 246                                 break;
 247                         }
 248
 249                         b += DETAILED_TIMING_DESCRIPTION_SIZE;
 250                 }
 251
 252                 for (i = 0; i < EDID_LENGTH - 1; i++)
 253                         csum += edid[i];
 254
 255                 edid[127] = 256 - csum;
 256                 break;
 257         }
 258 }
 259
 260 static int edid_checksum(unsigned char *edid)
 261 {
 262         unsigned char csum = 0, all_null = 0;
 263         int i, err = 0, fix = check_edid(edid);
 264
 265         if (fix)
 266                 fix_edid(edid, fix);
 267
 268         for (i = 0; i < EDID_LENGTH; i++) {
 269                 csum += edid[i];
 270                 all_null |= edid[i];
 271         }
 272
 273         if (csum == 0x00 && all_null) {
 274                 /* checksum passed, everything's good */
 275                 err = 1;
 276         }
 277
 278         return err;
 279 }
 280
 281 static int edid_check_header(unsigned char *edid)
 282 {
 283         int i, err = 1, fix = check_edid(edid);
 284
 285         if (fix)
 286                 fix_edid(edid, fix);
 287
 288         for (i = 0; i < 8; i++) {
 289                 if (edid[i] != edid_v1_header[i])
 290                         err = 0;
 291         }
 292
 293         return err;
 294 }
 295
 296 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
 297 {
 298         specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 299         specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
 300                 ((block[1] & 0xe0) >> 5) + '@';
 301         specs->manufacturer[2] = (block[1] & 0x1f) + '@';
 302         specs->manufacturer[3] = 0;
 303         specs->model = block[2] + (block[3] << 8);
 304         specs->serial = block[4] + (block[5] << 8) +
 305                (block[6] << 16) + (block[7] << 24);
 306         specs->year = block[9] + 1990;
 307         specs->week = block[8];
 308         DPRINTK("   Manufacturer: %s\n", specs->manufacturer);
 309         DPRINTK("   Model: %x\n", specs->model);
 310         DPRINTK("   Serial#: %u\n", specs->serial);
 311         DPRINTK("   Year: %u Week %u\n", specs->year, specs->week);
 312 }
 313
 314 static void get_dpms_capabilities(unsigned char flags,
 315                                   struct fb_monspecs *specs)
 316 {
 317         specs->dpms = 0;
 318         if (flags & DPMS_ACTIVE_OFF)
 319                 specs->dpms |= FB_DPMS_ACTIVE_OFF;
 320         if (flags & DPMS_SUSPEND)
 321                 specs->dpms |= FB_DPMS_SUSPEND;
 322         if (flags & DPMS_STANDBY)
 323                 specs->dpms |= FB_DPMS_STANDBY;
 324         DPRINTK("      DPMS: Active %s, Suspend %s, Standby %s\n",
 325                (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
 326                (flags & DPMS_SUSPEND)    ? "yes" : "no",
 327                (flags & DPMS_STANDBY)    ? "yes" : "no");
 328 }
 329
 330 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
 331 {
 332         int tmp;
 333
 334         DPRINTK("      Chroma\n");
 335         /* Chromaticity data */
 336         tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
 337         tmp *= 1000;
 338         tmp += 512;
 339         specs->chroma.redx = tmp/1024;
 340         DPRINTK("         RedX:     0.%03d ", specs->chroma.redx);
 341
 342         tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
 343         tmp *= 1000;
 344         tmp += 512;
 345         specs->chroma.redy = tmp/1024;
 346         DPRINTK("RedY:     0.%03d\n", specs->chroma.redy);
 347
 348         tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
 349         tmp *= 1000;
 350         tmp += 512;
 351         specs->chroma.greenx = tmp/1024;
 352         DPRINTK("         GreenX:   0.%03d ", specs->chroma.greenx);
 353
 354         tmp = (block[5] & 3) | (block[0xa] << 2);
 355         tmp *= 1000;
 356         tmp += 512;
 357         specs->chroma.greeny = tmp/1024;
 358         DPRINTK("GreenY:   0.%03d\n", specs->chroma.greeny);
 359
 360         tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
 361         tmp *= 1000;
 362         tmp += 512;
 363         specs->chroma.bluex = tmp/1024;
 364         DPRINTK("         BlueX:    0.%03d ", specs->chroma.bluex);
 365
 366         tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
 367         tmp *= 1000;
 368         tmp += 512;
 369         specs->chroma.bluey = tmp/1024;
 370         DPRINTK("BlueY:    0.%03d\n", specs->chroma.bluey);
 371
 372         tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
 373         tmp *= 1000;
 374         tmp += 512;
 375         specs->chroma.whitex = tmp/1024;
 376         DPRINTK("         WhiteX:   0.%03d ", specs->chroma.whitex);
 377
 378         tmp = (block[6] & 3) | (block[0xe] << 2);
 379         tmp *= 1000;
 380         tmp += 512;
 381         specs->chroma.whitey = tmp/1024;
 382         DPRINTK("WhiteY:   0.%03d\n", specs->chroma.whitey);
 383 }
 384
 385 static void calc_mode_timings(int xres, int yres, int refresh,
 386                               struct fb_videomode *mode)
 387 {
 388         struct fb_var_screeninfo *var;
 389
 390         var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
 391
 392         if (var) {
 393                 var->xres = xres;
 394                 var->yres = yres;
 395                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
 396                             refresh, var, NULL);
 397                 mode->xres = xres;
 398                 mode->yres = yres;
 399                 mode->pixclock = var->pixclock;
 400                 mode->refresh = refresh;
 401                 mode->left_margin = var->left_margin;
 402                 mode->right_margin = var->right_margin;
 403                 mode->upper_margin = var->upper_margin;
 404                 mode->lower_margin = var->lower_margin;
 405                 mode->hsync_len = var->hsync_len;
 406                 mode->vsync_len = var->vsync_len;
 407                 mode->vmode = 0;
 408                 mode->sync = 0;
 409                 kfree(var);
 410         }
 411 }
 412
 413 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
 414 {
 415         int num = 0;
 416         unsigned char c;
 417
 418         c = block[0];
 419         if (c&0x80) {
 420                 calc_mode_timings(720, 400, 70, &mode[num]);
 421                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 422                 DPRINTK("      720x400@70Hz\n");
 423         }
 424         if (c&0x40) {
 425                 calc_mode_timings(720, 400, 88, &mode[num]);
 426                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 427                 DPRINTK("      720x400@88Hz\n");
 428         }
 429         if (c&0x20) {
 430                 mode[num++] = vesa_modes[3];
 431                 DPRINTK("      640x480@60Hz\n");
 432         }
 433         if (c&0x10) {
 434                 calc_mode_timings(640, 480, 67, &mode[num]);
 435                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 436                 DPRINTK("      640x480@67Hz\n");
 437         }
 438         if (c&0x08) {
 439                 mode[num++] = vesa_modes[4];
 440                 DPRINTK("      640x480@72Hz\n");
 441         }
 442         if (c&0x04) {
 443                 mode[num++] = vesa_modes[5];
 444                 DPRINTK("      640x480@75Hz\n");
 445         }
 446         if (c&0x02) {
 447                 mode[num++] = vesa_modes[7];
 448                 DPRINTK("      800x600@56Hz\n");
 449         }
 450         if (c&0x01) {
 451                 mode[num++] = vesa_modes[8];
 452                 DPRINTK("      800x600@60Hz\n");
 453         }
 454
 455         c = block[1];
 456         if (c&0x80) {
 457                 mode[num++] = vesa_modes[9];
 458                 DPRINTK("      800x600@72Hz\n");
 459         }
 460         if (c&0x40) {
 461                 mode[num++] = vesa_modes[10];
 462                 DPRINTK("      800x600@75Hz\n");
 463         }
 464         if (c&0x20) {
 465                 calc_mode_timings(832, 624, 75, &mode[num]);
 466                 mode[num++].flag = FB_MODE_IS_CALCULATED;
 467                 DPRINTK("      832x624@75Hz\n");
 468         }
 469         if (c&0x10) {
 470                 mode[num++] = vesa_modes[12];
 471                 DPRINTK("      1024x768@87Hz Interlaced\n");
 472         }
 473         if (c&0x08) {
 474                 mode[num++] = vesa_modes[13];
 475                 DPRINTK("      1024x768@60Hz\n");
 476         }
 477         if (c&0x04) {
 478                 mode[num++] = vesa_modes[14];
 479                 DPRINTK("      1024x768@70Hz\n");
 480         }
 481         if (c&0x02) {
 482                 mode[num++] = vesa_modes[15];
 483                 DPRINTK("      1024x768@75Hz\n");
 484         }
 485         if (c&0x01) {
 486                 mode[num++] = vesa_modes[21];
 487                 DPRINTK("      1280x1024@75Hz\n");
 488         }
 489         c = block[2];
 490         if (c&0x80) {
 491                 mode[num++] = vesa_modes[17];
 492                 DPRINTK("      1152x870@75Hz\n");
 493         }
 494         DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
 495         return num;
 496 }
 497
 498 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
 499                 int ver, int rev)
 500 {
 501         int xres, yres = 0, refresh, ratio, i;
 502
 503         xres = (block[0] + 31) * 8;
 504         if (xres <= 256)
 505                 return 0;
 506
 507         ratio = (block[1] & 0xc0) >> 6;
 508         switch (ratio) {
 509         case 0:
 510                 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
 511                 if (ver < 1 || (ver == 1 && rev < 3))
 512                         yres = xres;
 513                 else
 514                         yres = (xres * 10)/16;
 515                 break;
 516         case 1:
 517                 yres = (xres * 3)/4;
 518                 break;
 519         case 2:
 520                 yres = (xres * 4)/5;
 521                 break;
 522         case 3:
 523                 yres = (xres * 9)/16;
 524                 break;
 525         }
 526         refresh = (block[1] & 0x3f) + 60;
 527
 528         DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 529         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 530                 if (vesa_modes[i].xres == xres &&
 531                     vesa_modes[i].yres == yres &&
 532                     vesa_modes[i].refresh == refresh) {
 533                         *mode = vesa_modes[i];
 534                         mode->flag |= FB_MODE_IS_STANDARD;
 535                         return 1;
 536                 }
 537         }
 538         calc_mode_timings(xres, yres, refresh, mode);
 539         return 1;
 540 }
 541
 542 static int get_dst_timing(unsigned char *block,
 543                           struct fb_videomode *mode, int ver, int rev)
 544 {
 545         int j, num = 0;
 546
 547         for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
 548                 num += get_std_timing(block, &mode[num], ver, rev);
 549
 550         return num;
 551 }
 552
 553 static void get_detailed_timing(unsigned char *block,
 554                                 struct fb_videomode *mode)
 555 {
 556         mode->xres = H_ACTIVE;
 557         mode->yres = V_ACTIVE;
 558         mode->pixclock = PIXEL_CLOCK;
 559         mode->pixclock /= 1000;
 560         mode->pixclock = KHZ2PICOS(mode->pixclock);
 561         mode->right_margin = H_SYNC_OFFSET;
 562         mode->left_margin = (H_ACTIVE + H_BLANKING) -
 563                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 564         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 565                 V_SYNC_WIDTH;
 566         mode->lower_margin = V_SYNC_OFFSET;
 567         mode->hsync_len = H_SYNC_WIDTH;
 568         mode->vsync_len = V_SYNC_WIDTH;
 569         if (HSYNC_POSITIVE)
 570                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 571         if (VSYNC_POSITIVE)
 572                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 573         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 574                                      (V_ACTIVE + V_BLANKING));
 575         if (INTERLACED) {
 576                 mode->yres *= 2;
 577                 mode->upper_margin *= 2;
 578                 mode->lower_margin *= 2;
 579                 mode->vsync_len *= 2;
 580                 mode->vmode |= FB_VMODE_INTERLACED;
 581         }
 582         mode->flag = FB_MODE_IS_DETAILED;
 583
 584         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 585         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 586                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 587         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 588                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 589         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 590                (VSYNC_POSITIVE) ? "+" : "-");
 591 }
 592
 593 /**
 594  * fb_create_modedb - create video mode database
 595  * @edid: EDID data
 596  * @dbsize: database size
 597  *
 598  * RETURNS: struct fb_videomode, @dbsize contains length of database
 599  *
 600  * DESCRIPTION:
 601  * This function builds a mode database using the contents of the EDID
 602  * data
 603  */
 604 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 605 {
 606         struct fb_videomode *mode, *m;
 607         unsigned char *block;
 608         int num = 0, i, first = 1;
 609         int ver, rev;
 610
 611         ver = edid[EDID_STRUCT_VERSION];
 612         rev = edid[EDID_STRUCT_REVISION];
 613
 614         mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 615         if (mode == NULL)
 616                 return NULL;
 617
 618         if (edid == NULL || !edid_checksum(edid) ||
 619             !edid_check_header(edid)) {
 620                 kfree(mode);
 621                 return NULL;
 622         }
 623
 624         *dbsize = 0;
 625
 626         DPRINTK("   Detailed Timings\n");
 627         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 628         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 629                 if (!(block[0] == 0x00 && block[1] == 0x00)) {
 630                         get_detailed_timing(block, &mode[num]);
 631                         if (first) {
 632                                 mode[num].flag |= FB_MODE_IS_FIRST;
 633                                 first = 0;
 634                         }
 635                         num++;
 636                 }
 637         }
 638
 639         DPRINTK("   Supported VESA Modes\n");
 640         block = edid + ESTABLISHED_TIMING_1;
 641         num += get_est_timing(block, &mode[num]);
 642
 643         DPRINTK("   Standard Timings\n");
 644         block = edid + STD_TIMING_DESCRIPTIONS_START;
 645         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 646                 num += get_std_timing(block, &mode[num], ver, rev);
 647
 648         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 649         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 650                 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 651                         num += get_dst_timing(block + 5, &mode[num], ver, rev);
 652         }
 653
 654         /* Yikes, EDID data is totally useless */
 655         if (!num) {
 656                 kfree(mode);
 657                 return NULL;
 658         }
 659
 660         *dbsize = num;
 661         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 662         if (!m)
 663                 return mode;
 664         memmove(m, mode, num * sizeof(struct fb_videomode));
 665         kfree(mode);
 666         return m;
 667 }
 668
 669 /**
 670  * fb_destroy_modedb - destroys mode database
 671  * @modedb: mode database to destroy
 672  *
 673  * DESCRIPTION:
 674  * Destroy mode database created by fb_create_modedb
 675  */
 676 void fb_destroy_modedb(struct fb_videomode *modedb)
 677 {
 678         kfree(modedb);
 679 }
 680
 681 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 682 {
 683         int i, retval = 1;
 684         unsigned char *block;
 685
 686         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 687
 688         DPRINTK("      Monitor Operating Limits: ");
 689
 690         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 691                 if (edid_is_limits_block(block)) {
 692                         specs->hfmin = H_MIN_RATE * 1000;
 693                         specs->hfmax = H_MAX_RATE * 1000;
 694                         specs->vfmin = V_MIN_RATE;
 695                         specs->vfmax = V_MAX_RATE;
 696                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 697                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 698                         retval = 0;
 699                         DPRINTK("From EDID\n");
 700                         break;
 701                 }
 702         }
 703
 704         /* estimate monitor limits based on modes supported */
 705         if (retval) {
 706                 struct fb_videomode *modes, *mode;
 707                 int num_modes, hz, hscan, pixclock;
 708                 int vtotal, htotal;
 709
 710                 modes = fb_create_modedb(edid, &num_modes);
 711                 if (!modes) {
 712                         DPRINTK("None Available\n");
 713                         return 1;
 714                 }
 715
 716                 retval = 0;
 717                 for (i = 0; i < num_modes; i++) {
 718                         mode = &modes[i];
 719                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 720                         htotal = mode->xres + mode->right_margin + mode->hsync_len
 721                                 + mode->left_margin;
 722                         vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 723                                 + mode->upper_margin;
 724
 725                         if (mode->vmode & FB_VMODE_INTERLACED)
 726                                 vtotal /= 2;
 727
 728                         if (mode->vmode & FB_VMODE_DOUBLE)
 729                                 vtotal *= 2;
 730
 731                         hscan = (pixclock + htotal / 2) / htotal;
 732                         hscan = (hscan + 500) / 1000 * 1000;
 733                         hz = (hscan + vtotal / 2) / vtotal;
 734
 735                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 736                                 specs->dclkmax = pixclock;
 737
 738                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 739                                 specs->dclkmin = pixclock;
 740
 741                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 742                                 specs->hfmax = hscan;
 743
 744                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 745                                 specs->hfmin = hscan;
 746
 747                         if (specs->vfmax == 0 || specs->vfmax < hz)
 748                                 specs->vfmax = hz;
 749
 750                         if (specs->vfmin == 0 || specs->vfmin > hz)
 751                                 specs->vfmin = hz;
 752                 }
 753                 DPRINTK("Extrapolated\n");
 754                 fb_destroy_modedb(modes);
 755         }
 756         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 757                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 758                 specs->vfmax, specs->dclkmax/1000000);
 759         return retval;
 760 }
 761
 762 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 763 {
 764         unsigned char c, *block;
 765
 766         block = edid + EDID_STRUCT_DISPLAY;
 767
 768         fb_get_monitor_limits(edid, specs);
 769
 770         c = block[0] & 0x80;
 771         specs->input = 0;
 772         if (c) {
 773                 specs->input |= FB_DISP_DDI;
 774                 DPRINTK("      Digital Display Input");
 775         } else {
 776                 DPRINTK("      Analog Display Input: Input Voltage - ");
 777                 switch ((block[0] & 0x60) >> 5) {
 778                 case 0:
 779                         DPRINTK("0.700V/0.300V");
 780                         specs->input |= FB_DISP_ANA_700_300;
 781                         break;
 782                 case 1:
 783                         DPRINTK("0.714V/0.286V");
 784                         specs->input |= FB_DISP_ANA_714_286;
 785                         break;
 786                 case 2:
 787                         DPRINTK("1.000V/0.400V");
 788                         specs->input |= FB_DISP_ANA_1000_400;
 789                         break;
 790                 case 3:
 791                         DPRINTK("0.700V/0.000V");
 792                         specs->input |= FB_DISP_ANA_700_000;
 793                         break;
 794                 }
 795         }
 796         DPRINTK("\n      Sync: ");
 797         c = block[0] & 0x10;
 798         if (c)
 799                 DPRINTK("      Configurable signal level\n");
 800         c = block[0] & 0x0f;
 801         specs->signal = 0;
 802         if (c & 0x10) {
 803                 DPRINTK("Blank to Blank ");
 804                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 805         }
 806         if (c & 0x08) {
 807                 DPRINTK("Separate ");
 808                 specs->signal |= FB_SIGNAL_SEPARATE;
 809         }
 810         if (c & 0x04) {
 811                 DPRINTK("Composite ");
 812                 specs->signal |= FB_SIGNAL_COMPOSITE;
 813         }
 814         if (c & 0x02) {
 815                 DPRINTK("Sync on Green ");
 816                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 817         }
 818         if (c & 0x01) {
 819                 DPRINTK("Serration on ");
 820                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 821         }
 822         DPRINTK("\n");
 823         specs->max_x = block[1];
 824         specs->max_y = block[2];
 825         DPRINTK("      Max H-size in cm: ");
 826         if (specs->max_x)
 827                 DPRINTK("%d\n", specs->max_x);
 828         else
 829                 DPRINTK("variable\n");
 830         DPRINTK("      Max V-size in cm: ");
 831         if (specs->max_y)
 832                 DPRINTK("%d\n", specs->max_y);
 833         else
 834                 DPRINTK("variable\n");
 835
 836         c = block[3];
 837         specs->gamma = c+100;
 838         DPRINTK("      Gamma: ");
 839         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 840
 841         get_dpms_capabilities(block[4], specs);
 842
 843         switch ((block[4] & 0x18) >> 3) {
 844         case 0:
 845                 DPRINTK("      Monochrome/Grayscale\n");
 846                 specs->input |= FB_DISP_MONO;
 847                 break;
 848         case 1:
 849                 DPRINTK("      RGB Color Display\n");
 850                 specs->input |= FB_DISP_RGB;
 851                 break;
 852         case 2:
 853                 DPRINTK("      Non-RGB Multicolor Display\n");
 854                 specs->input |= FB_DISP_MULTI;
 855                 break;
 856         default:
 857                 DPRINTK("      Unknown\n");
 858                 specs->input |= FB_DISP_UNKNOWN;
 859                 break;
 860         }
 861
 862         get_chroma(block, specs);
 863
 864         specs->misc = 0;
 865         c = block[4] & 0x7;
 866         if (c & 0x04) {
 867                 DPRINTK("      Default color format is primary\n");
 868                 specs->misc |= FB_MISC_PRIM_COLOR;
 869         }
 870         if (c & 0x02) {
 871                 DPRINTK("      First DETAILED Timing is preferred\n");
 872                 specs->misc |= FB_MISC_1ST_DETAIL;
 873         }
 874         if (c & 0x01) {
 875                 printk("      Display is GTF capable\n");
 876                 specs->gtf = 1;
 877         }
 878 }
 879
 880 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 881 {
 882         int i;
 883         unsigned char *block;
 884
 885         if (edid == NULL || var == NULL)
 886                 return 1;
 887
 888         if (!(edid_checksum(edid)))
 889                 return 1;
 890
 891         if (!(edid_check_header(edid)))
 892                 return 1;
 893
 894         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 895
 896         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 897                 if (edid_is_timing_block(block)) {
 898                         var->xres = var->xres_virtual = H_ACTIVE;
 899                         var->yres = var->yres_virtual = V_ACTIVE;
 900                         var->height = var->width = 0;
 901                         var->right_margin = H_SYNC_OFFSET;
 902                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 903                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 904                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 905                                 V_SYNC_WIDTH;
 906                         var->lower_margin = V_SYNC_OFFSET;
 907                         var->hsync_len = H_SYNC_WIDTH;
 908                         var->vsync_len = V_SYNC_WIDTH;
 909                         var->pixclock = PIXEL_CLOCK;
 910                         var->pixclock /= 1000;
 911                         var->pixclock = KHZ2PICOS(var->pixclock);
 912
 913                         if (HSYNC_POSITIVE)
 914                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 915                         if (VSYNC_POSITIVE)
 916                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 917                         return 0;
 918                 }
 919         }
 920         return 1;
 921 }
 922
 923 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 924 {
 925         unsigned char *block;
 926         int i, found = 0;
 927
 928         if (edid == NULL)
 929                 return;
 930
 931         if (!(edid_checksum(edid)))
 932                 return;
 933
 934         if (!(edid_check_header(edid)))
 935                 return;
 936
 937         memset(specs, 0, sizeof(struct fb_monspecs));
 938
 939         specs->version = edid[EDID_STRUCT_VERSION];
 940         specs->revision = edid[EDID_STRUCT_REVISION];
 941
 942         DPRINTK("========================================\n");
 943         DPRINTK("Display Information (EDID)\n");
 944         DPRINTK("========================================\n");
 945         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 946                (int) specs->revision);
 947
 948         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 949
 950         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 951         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 952                 if (edid_is_serial_block(block)) {
 953                         copy_string(block, specs->serial_no);
 954                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 955                 } else if (edid_is_ascii_block(block)) {
 956                         copy_string(block, specs->ascii);
 957                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 958                 } else if (edid_is_monitor_block(block)) {
 959                         copy_string(block, specs->monitor);
 960                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 961                 }
 962         }
 963
 964         DPRINTK("   Display Characteristics:\n");
 965         get_monspecs(edid, specs);
 966
 967         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 968
 969         /*
 970          * Workaround for buggy EDIDs that sets that the first
 971          * detailed timing is preferred but has not detailed
 972          * timing specified
 973          */
 974         for (i = 0; i < specs->modedb_len; i++) {
 975                 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 976                         found = 1;
 977                         break;
 978                 }
 979         }
 980
 981         if (!found)
 982                 specs->misc &= ~FB_MISC_1ST_DETAIL;
 983
 984         DPRINTK("========================================\n");
 985 }
 986
 987 /**
 988  * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
 989  * @edid:       128 byte array with an E-EDID block
 990  * @spacs:      monitor specs to be extended
 991  */
 992 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 993 {
 994         unsigned char *block;
 995         struct fb_videomode *m;
 996         int num = 0, i;
 997         u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
 998         u8 pos = 4, svd_n = 0;
 999
1000         if (!edid)
1001                 return;
1002
1003         if (!edid_checksum(edid))
1004                 return;
1005
1006         if (edid[0] != 0x2 ||
1007             edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1008                 return;
1009
1010         DPRINTK("  Short Video Descriptors\n");
1011
1012         while (pos < edid[2]) {
1013                 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1014                 pr_debug("Data block %u of %u bytes\n", type, len);
1015                 if (type == 2) {
1016                         for (i = pos; i < pos + len; i++) {
1017                                 u8 idx = edid[pos + i] & 0x7f;
1018                                 svd[svd_n++] = idx;
1019                                 pr_debug("N%sative mode #%d\n",
1020                                          edid[pos + i] & 0x80 ? "" : "on-n", idx);
1021                         }
1022                 } else if (type == 3 && len >= 3) {
1023                         /* Check Vendor Specific Data Block.  For HDMI,
1024                            it is always 00-0C-03 for HDMI Licensing, LLC. */
1025                         if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
1026                             edid[pos + 3] == 0)
1027                                 specs->misc |= FB_MISC_HDMI;
1028                 }
1029                 pos += len + 1;
1030         }
1031
1032         block = edid + edid[2];
1033
1034         DPRINTK("  Extended Detailed Timings\n");
1035
1036         for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1037              i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1038                 if (PIXEL_CLOCK)
1039                         edt[num++] = block - edid;
1040
1041         /* Yikes, EDID data is totally useless */
1042         if (!(num + svd_n))
1043                 return;
1044
1045         m = kzalloc((specs->modedb_len + num + svd_n) *
1046                        sizeof(struct fb_videomode), GFP_KERNEL);
1047
1048         if (!m)
1049                 return;
1050
1051         memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1052
1053         for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1054                 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1055                 if (i == specs->modedb_len)
1056                         m[i].flag |= FB_MODE_IS_FIRST;
1057                 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1058         }
1059
1060         for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1061                 int idx = svd[i - specs->modedb_len - num];
1062                 if (!idx || idx > 63) {
1063                         pr_warning("Reserved SVD code %d\n", idx);
1064                 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1065                         pr_warning("Unimplemented SVD code %d\n", idx);
1066                 } else {
1067                         memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1068                         pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1069                                  m[i].xres, m[i].yres, m[i].refresh);
1070                 }
1071         }
1072
1073         kfree(specs->modedb);
1074         specs->modedb = m;
1075         specs->modedb_len = specs->modedb_len + num + svd_n;
1076 }
1077
1078 /*
1079  * VESA Generalized Timing Formula (GTF)
1080  */
1081
1082 #define FLYBACK                     550
1083 #define V_FRONTPORCH                1
1084 #define H_OFFSET                    40
1085 #define H_SCALEFACTOR               20
1086 #define H_BLANKSCALE                128
1087 #define H_GRADIENT                  600
1088 #define C_VAL                       30
1089 #define M_VAL                       300
1090
1091 struct __fb_timings {
1092         u32 dclk;
1093         u32 hfreq;
1094         u32 vfreq;
1095         u32 hactive;
1096         u32 vactive;
1097         u32 hblank;
1098         u32 vblank;
1099         u32 htotal;
1100         u32 vtotal;
1101 };
1102
1103 /**
1104  * fb_get_vblank - get vertical blank time
1105  * @hfreq: horizontal freq
1106  *
1107  * DESCRIPTION:
1108  * vblank = right_margin + vsync_len + left_margin
1109  *
1110  *    given: right_margin = 1 (V_FRONTPORCH)
1111  *           vsync_len    = 3
1112  *           flyback      = 550
1113  *
1114  *                          flyback * hfreq
1115  *           left_margin  = --------------- - vsync_len
1116  *                           1000000
1117  */
1118 static u32 fb_get_vblank(u32 hfreq)
1119 {
1120         u32 vblank;
1121
1122         vblank = (hfreq * FLYBACK)/1000;
1123         vblank = (vblank + 500)/1000;
1124         return (vblank + V_FRONTPORCH);
1125 }
1126
1127 /**
1128  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1129  * @hfreq: horizontal freq
1130  * @xres: horizontal resolution in pixels
1131  *
1132  * DESCRIPTION:
1133  *
1134  *           xres * duty_cycle
1135  * hblank = ------------------
1136  *           100 - duty_cycle
1137  *
1138  * duty cycle = percent of htotal assigned to inactive display
1139  * duty cycle = C - (M/Hfreq)
1140  *
1141  * where: C = ((offset - scale factor) * blank_scale)
1142  *            -------------------------------------- + scale factor
1143  *                        256
1144  *        M = blank_scale * gradient
1145  *
1146  */
1147 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1148 {
1149         u32 c_val, m_val, duty_cycle, hblank;
1150
1151         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1152                  H_SCALEFACTOR) * 1000;
1153         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1154         m_val = (m_val * 1000000)/hfreq;
1155         duty_cycle = c_val - m_val;
1156         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1157         return (hblank);
1158 }
1159
1160 /**
1161  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1162  * @dclk: pixelclock in Hz
1163  * @xres: horizontal resolution in pixels
1164  *
1165  * DESCRIPTION:
1166  *
1167  *           xres * duty_cycle
1168  * hblank = ------------------
1169  *           100 - duty_cycle
1170  *
1171  * duty cycle = percent of htotal assigned to inactive display
1172  * duty cycle = C - (M * h_period)
1173  *
1174  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1175  *                   -----------------------------------------------
1176  *                                    2 * M
1177  *        M = 300;
1178  *        C = 30;
1179
1180  */
1181 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1182 {
1183         u32 duty_cycle, h_period, hblank;
1184
1185         dclk /= 1000;
1186         h_period = 100 - C_VAL;
1187         h_period *= h_period;
1188         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1189         h_period *= 10000;
1190
1191         h_period = int_sqrt(h_period);
1192         h_period -= (100 - C_VAL) * 100;
1193         h_period *= 1000;
1194         h_period /= 2 * M_VAL;
1195
1196         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1197         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1198         hblank &= ~15;
1199         return (hblank);
1200 }
1201
1202 /**
1203  * fb_get_hfreq - estimate hsync
1204  * @vfreq: vertical refresh rate
1205  * @yres: vertical resolution
1206  *
1207  * DESCRIPTION:
1208  *
1209  *          (yres + front_port) * vfreq * 1000000
1210  * hfreq = -------------------------------------
1211  *          (1000000 - (vfreq * FLYBACK)
1212  *
1213  */
1214
1215 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1216 {
1217         u32 divisor, hfreq;
1218
1219         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1220         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1221         return (hfreq/divisor);
1222 }
1223
1224 static void fb_timings_vfreq(struct __fb_timings *timings)
1225 {
1226         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1227         timings->vblank = fb_get_vblank(timings->hfreq);
1228         timings->vtotal = timings->vactive + timings->vblank;
1229         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1230                                                  timings->hactive);
1231         timings->htotal = timings->hactive + timings->hblank;
1232         timings->dclk = timings->htotal * timings->hfreq;
1233 }
1234
1235 static void fb_timings_hfreq(struct __fb_timings *timings)
1236 {
1237         timings->vblank = fb_get_vblank(timings->hfreq);
1238         timings->vtotal = timings->vactive + timings->vblank;
1239         timings->vfreq = timings->hfreq/timings->vtotal;
1240         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1241                                                  timings->hactive);
1242         timings->htotal = timings->hactive + timings->hblank;
1243         timings->dclk = timings->htotal * timings->hfreq;
1244 }
1245
1246 static void fb_timings_dclk(struct __fb_timings *timings)
1247 {
1248         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1249                                                 timings->hactive);
1250         timings->htotal = timings->hactive + timings->hblank;
1251         timings->hfreq = timings->dclk/timings->htotal;
1252         timings->vblank = fb_get_vblank(timings->hfreq);
1253         timings->vtotal = timings->vactive + timings->vblank;
1254         timings->vfreq = timings->hfreq/timings->vtotal;
1255 }
1256
1257 /*
1258  * fb_get_mode - calculates video mode using VESA GTF
1259  * @flags: if: 0 - maximize vertical refresh rate
1260  *             1 - vrefresh-driven calculation;
1261  *             2 - hscan-driven calculation;
1262  *             3 - pixelclock-driven calculation;
1263  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1264  * @var: pointer to fb_var_screeninfo
1265  * @info: pointer to fb_info
1266  *
1267  * DESCRIPTION:
1268  * Calculates video mode based on monitor specs using VESA GTF.
1269  * The GTF is best for VESA GTF compliant monitors but is
1270  * specifically formulated to work for older monitors as well.
1271  *
1272  * If @flag==0, the function will attempt to maximize the
1273  * refresh rate.  Otherwise, it will calculate timings based on
1274  * the flag and accompanying value.
1275  *
1276  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1277  * ignored and @var will be filled with the calculated timings.
1278  *
1279  * All calculations are based on the VESA GTF Spreadsheet
1280  * available at VESA's public ftp (http://www.vesa.org).
1281  *
1282  * NOTES:
1283  * The timings generated by the GTF will be different from VESA
1284  * DMT.  It might be a good idea to keep a table of standard
1285  * VESA modes as well.  The GTF may also not work for some displays,
1286  * such as, and especially, analog TV.
1287  *
1288  * REQUIRES:
1289  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1290  */
1291 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1292 {
1293         struct __fb_timings *timings;
1294         u32 interlace = 1, dscan = 1;
1295         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1296
1297
1298         timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1299
1300         if (!timings)
1301                 return -ENOMEM;
1302
1303         /*
1304          * If monspecs are invalid, use values that are enough
1305          * for 640x480@60
1306          */
1307         if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1308             !info->monspecs.dclkmax ||
1309             info->monspecs.hfmax < info->monspecs.hfmin ||
1310             info->monspecs.vfmax < info->monspecs.vfmin ||
1311             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1312                 hfmin = 29000; hfmax = 30000;
1313                 vfmin = 60; vfmax = 60;
1314                 dclkmin = 0; dclkmax = 25000000;
1315         } else {
1316                 hfmin = info->monspecs.hfmin;
1317                 hfmax = info->monspecs.hfmax;
1318                 vfmin = info->monspecs.vfmin;
1319                 vfmax = info->monspecs.vfmax;
1320                 dclkmin = info->monspecs.dclkmin;
1321                 dclkmax = info->monspecs.dclkmax;
1322         }
1323
1324         timings->hactive = var->xres;
1325         timings->vactive = var->yres;
1326         if (var->vmode & FB_VMODE_INTERLACED) {
1327                 timings->vactive /= 2;
1328                 interlace = 2;
1329         }
1330         if (var->vmode & FB_VMODE_DOUBLE) {
1331                 timings->vactive *= 2;
1332                 dscan = 2;
1333         }
1334
1335         switch (flags & ~FB_IGNOREMON) {
1336         case FB_MAXTIMINGS: /* maximize refresh rate */
1337                 timings->hfreq = hfmax;
1338                 fb_timings_hfreq(timings);
1339                 if (timings->vfreq > vfmax) {
1340                         timings->vfreq = vfmax;
1341                         fb_timings_vfreq(timings);
1342                 }
1343                 if (timings->dclk > dclkmax) {
1344                         timings->dclk = dclkmax;
1345                         fb_timings_dclk(timings);
1346                 }
1347                 break;
1348         case FB_VSYNCTIMINGS: /* vrefresh driven */
1349                 timings->vfreq = val;
1350                 fb_timings_vfreq(timings);
1351                 break;
1352         case FB_HSYNCTIMINGS: /* hsync driven */
1353                 timings->hfreq = val;
1354                 fb_timings_hfreq(timings);
1355                 break;
1356         case FB_DCLKTIMINGS: /* pixelclock driven */
1357                 timings->dclk = PICOS2KHZ(val) * 1000;
1358                 fb_timings_dclk(timings);
1359                 break;
1360         default:
1361                 err = -EINVAL;
1362
1363         }
1364
1365         if (err || (!(flags & FB_IGNOREMON) &&
1366             (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1367              timings->hfreq < hfmin || timings->hfreq > hfmax ||
1368              timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1369                 err = -EINVAL;
1370         } else {
1371                 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1372                 var->hsync_len = (timings->htotal * 8)/100;
1373                 var->right_margin = (timings->hblank/2) - var->hsync_len;
1374                 var->left_margin = timings->hblank - var->right_margin -
1375                         var->hsync_len;
1376                 var->vsync_len = (3 * interlace)/dscan;
1377                 var->lower_margin = (1 * interlace)/dscan;
1378                 var->upper_margin = (timings->vblank * interlace)/dscan -
1379                         (var->vsync_len + var->lower_margin);
1380         }
1381
1382         kfree(timings);
1383         return err;
1384 }
1385
1386 #ifdef CONFIG_VIDEOMODE_HELPERS
1387 int fb_videomode_from_videomode(const struct videomode *vm,
1388                                 struct fb_videomode *fbmode)
1389 {
1390         unsigned int htotal, vtotal;
1391
1392         fbmode->xres = vm->hactive;
1393         fbmode->left_margin = vm->hback_porch;
1394         fbmode->right_margin = vm->hfront_porch;
1395         fbmode->hsync_len = vm->hsync_len;
1396
1397         fbmode->yres = vm->vactive;
1398         fbmode->upper_margin = vm->vback_porch;
1399         fbmode->lower_margin = vm->vfront_porch;
1400         fbmode->vsync_len = vm->vsync_len;
1401
1402         /* prevent division by zero in KHZ2PICOS macro */
1403         fbmode->pixclock = vm->pixelclock ?
1404                         KHZ2PICOS(vm->pixelclock / 1000) : 0;
1405
1406         fbmode->sync = 0;
1407         fbmode->vmode = 0;
1408         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1409                 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1410         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1411                 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1412         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1413                 fbmode->vmode |= FB_VMODE_INTERLACED;
1414         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1415                 fbmode->vmode |= FB_VMODE_DOUBLE;
1416         fbmode->flag = 0;
1417
1418         htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1419                  vm->hsync_len;
1420         vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1421                  vm->vsync_len;
1422         /* prevent division by zero */
1423         if (htotal && vtotal) {
1424                 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1425         /* a mode must have htotal and vtotal != 0 or it is invalid */
1426         } else {
1427                 fbmode->refresh = 0;
1428                 return -EINVAL;
1429         }
1430
1431         return 0;
1432 }
1433 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1434
1435 #ifdef CONFIG_OF
1436 static inline void dump_fb_videomode(const struct fb_videomode *m)
1437 {
1438         pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1439                  m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1440                  m->right_margin, m->upper_margin, m->lower_margin,
1441                  m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1442 }
1443
1444 /**
1445  * of_get_fb_videomode - get a fb_videomode from devicetree
1446  * @np: device_node with the timing specification
1447  * @fb: will be set to the return value
1448  * @index: index into the list of display timings in devicetree
1449  *
1450  * DESCRIPTION:
1451  * This function is expensive and should only be used, if only one mode is to be
1452  * read from DT. To get multiple modes start with of_get_display_timings ond
1453  * work with that instead.
1454  */
1455 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1456                         int index)
1457 {
1458         struct videomode vm;
1459         int ret;
1460
1461         ret = of_get_videomode(np, &vm, index);
1462         if (ret)
1463                 return ret;
1464
1465         fb_videomode_from_videomode(&vm, fb);
1466
1467         pr_debug("%s: got %dx%d display mode from %s\n",
1468                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1469         dump_fb_videomode(fb);
1470
1471         return 0;
1472 }
1473 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1474 #endif /* CONFIG_OF */
1475 #endif /* CONFIG_VIDEOMODE_HELPERS */
1476
1477 #else
1478 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1479 {
1480         return 1;
1481 }
1482 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1483 {
1484         specs = NULL;
1485 }
1486 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1487 {
1488 }
1489 void fb_destroy_modedb(struct fb_videomode *modedb)
1490 {
1491 }
1492 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1493                 struct fb_info *info)
1494 {
1495         return -EINVAL;
1496 }
1497 #endif /* CONFIG_FB_MODE_HELPERS */
1498
1499 /*
1500  * fb_validate_mode - validates var against monitor capabilities
1501  * @var: pointer to fb_var_screeninfo
1502  * @info: pointer to fb_info
1503  *
1504  * DESCRIPTION:
1505  * Validates video mode against monitor capabilities specified in
1506  * info->monspecs.
1507  *
1508  * REQUIRES:
1509  * A valid info->monspecs.
1510  */
1511 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1512 {
1513         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1514         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1515
1516         /*
1517          * If monspecs are invalid, use values that are enough
1518          * for 640x480@60
1519          */
1520         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1521             !info->monspecs.dclkmax ||
1522             info->monspecs.hfmax < info->monspecs.hfmin ||
1523             info->monspecs.vfmax < info->monspecs.vfmin ||
1524             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1525                 hfmin = 29000; hfmax = 30000;
1526                 vfmin = 60; vfmax = 60;
1527                 dclkmin = 0; dclkmax = 25000000;
1528         } else {
1529                 hfmin = info->monspecs.hfmin;
1530                 hfmax = info->monspecs.hfmax;
1531                 vfmin = info->monspecs.vfmin;
1532                 vfmax = info->monspecs.vfmax;
1533                 dclkmin = info->monspecs.dclkmin;
1534                 dclkmax = info->monspecs.dclkmax;
1535         }
1536
1537         if (!var->pixclock)
1538                 return -EINVAL;
1539         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1540
1541         htotal = var->xres + var->right_margin + var->hsync_len +
1542                 var->left_margin;
1543         vtotal = var->yres + var->lower_margin + var->vsync_len +
1544                 var->upper_margin;
1545
1546         if (var->vmode & FB_VMODE_INTERLACED)
1547                 vtotal /= 2;
1548         if (var->vmode & FB_VMODE_DOUBLE)
1549                 vtotal *= 2;
1550
1551         hfreq = pixclock/htotal;
1552         hfreq = (hfreq + 500) / 1000 * 1000;
1553
1554         vfreq = hfreq/vtotal;
1555
1556         return (vfreq < vfmin || vfreq > vfmax ||
1557                 hfreq < hfmin || hfreq > hfmax ||
1558                 pixclock < dclkmin || pixclock > dclkmax) ?
1559                 -EINVAL : 0;
1560 }
1561
1562 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1563
1564 /*
1565  * We need to ensure that the EDID block is only returned for
1566  * the primary graphics adapter.
1567  */
1568
1569 const unsigned char *fb_firmware_edid(struct device *device)
1570 {
1571         struct pci_dev *dev = NULL;
1572         struct resource *res = NULL;
1573         unsigned char *edid = NULL;
1574
1575         if (device)
1576                 dev = to_pci_dev(device);
1577
1578         if (dev)
1579                 res = &dev->resource[PCI_ROM_RESOURCE];
1580
1581         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1582                 edid = edid_info.dummy;
1583
1584         return edid;
1585 }
1586 #else
1587 const unsigned char *fb_firmware_edid(struct device *device)
1588 {
1589         return NULL;
1590 }
1591 #endif
1592 EXPORT_SYMBOL(fb_firmware_edid);
1593
1594 EXPORT_SYMBOL(fb_parse_edid);
1595 EXPORT_SYMBOL(fb_edid_to_monspecs);
1596 EXPORT_SYMBOL(fb_edid_add_monspecs);
1597 EXPORT_SYMBOL(fb_get_mode);
1598 EXPORT_SYMBOL(fb_validate_mode);
1599 EXPORT_SYMBOL(fb_destroy_modedb);