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, const struct fb_monspecs *specs)
 500 {
 501         int i;
 502
 503         for (i = 0; i < DMT_SIZE; i++) {
 504                 u32 std_2byte_code = block[0] << 8 | block[1];
 505                 if (std_2byte_code == dmt_modes[i].std_2byte_code)
 506                         break;
 507         }
 508
 509         if (i < DMT_SIZE && dmt_modes[i].mode) {
 510                 /* DMT mode found */
 511                 *mode = *dmt_modes[i].mode;
 512                 mode->flag |= FB_MODE_IS_STANDARD;
 513                 DPRINTK("        DMT id=%d\n", dmt_modes[i].dmt_id);
 514
 515         } else {
 516                 int xres, yres = 0, refresh, ratio;
 517
 518                 xres = (block[0] + 31) * 8;
 519                 if (xres <= 256)
 520                         return 0;
 521
 522                 ratio = (block[1] & 0xc0) >> 6;
 523                 switch (ratio) {
 524                 case 0:
 525                         /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
 526                         if (ver < 1 || (ver == 1 && rev < 3))
 527                                 yres = xres;
 528                         else
 529                                 yres = (xres * 10)/16;
 530                         break;
 531                 case 1:
 532                         yres = (xres * 3)/4;
 533                         break;
 534                 case 2:
 535                         yres = (xres * 4)/5;
 536                         break;
 537                 case 3:
 538                         yres = (xres * 9)/16;
 539                         break;
 540                 }
 541                 refresh = (block[1] & 0x3f) + 60;
 542                 DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 543
 544                 calc_mode_timings(xres, yres, refresh, mode);
 545         }
 546
 547         /* Check the mode we got is within valid spec of the monitor */
 548         if (specs && specs->dclkmax
 549             && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) {
 550                 DPRINTK("        mode exceed max DCLK\n");
 551                 return 0;
 552         }
 553
 554         return 1;
 555 }
 556
 557 static int get_dst_timing(unsigned char *block, struct fb_videomode *mode,
 558                           int ver, int rev, const struct fb_monspecs *specs)
 559 {
 560         int j, num = 0;
 561
 562         for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
 563                 num += get_std_timing(block, &mode[num], ver, rev, specs);
 564
 565         return num;
 566 }
 567
 568 static void get_detailed_timing(unsigned char *block,
 569                                 struct fb_videomode *mode)
 570 {
 571         mode->xres = H_ACTIVE;
 572         mode->yres = V_ACTIVE;
 573         mode->pixclock = PIXEL_CLOCK;
 574         mode->pixclock /= 1000;
 575         mode->pixclock = KHZ2PICOS(mode->pixclock);
 576         mode->right_margin = H_SYNC_OFFSET;
 577         mode->left_margin = (H_ACTIVE + H_BLANKING) -
 578                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 579         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 580                 V_SYNC_WIDTH;
 581         mode->lower_margin = V_SYNC_OFFSET;
 582         mode->hsync_len = H_SYNC_WIDTH;
 583         mode->vsync_len = V_SYNC_WIDTH;
 584         if (HSYNC_POSITIVE)
 585                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 586         if (VSYNC_POSITIVE)
 587                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 588         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 589                                      (V_ACTIVE + V_BLANKING));
 590         if (INTERLACED) {
 591                 mode->yres *= 2;
 592                 mode->upper_margin *= 2;
 593                 mode->lower_margin *= 2;
 594                 mode->vsync_len *= 2;
 595                 mode->vmode |= FB_VMODE_INTERLACED;
 596         }
 597         mode->flag = FB_MODE_IS_DETAILED;
 598
 599         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 600         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 601                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 602         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 603                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 604         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 605                (VSYNC_POSITIVE) ? "+" : "-");
 606 }
 607
 608 /**
 609  * fb_create_modedb - create video mode database
 610  * @edid: EDID data
 611  * @dbsize: database size
 612  *
 613  * RETURNS: struct fb_videomode, @dbsize contains length of database
 614  *
 615  * DESCRIPTION:
 616  * This function builds a mode database using the contents of the EDID
 617  * data
 618  */
 619 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
 620                                              const struct fb_monspecs *specs)
 621 {
 622         struct fb_videomode *mode, *m;
 623         unsigned char *block;
 624         int num = 0, i, first = 1;
 625         int ver, rev;
 626
 627         mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 628         if (mode == NULL)
 629                 return NULL;
 630
 631         if (edid == NULL || !edid_checksum(edid) ||
 632             !edid_check_header(edid)) {
 633                 kfree(mode);
 634                 return NULL;
 635         }
 636
 637         ver = edid[EDID_STRUCT_VERSION];
 638         rev = edid[EDID_STRUCT_REVISION];
 639
 640         *dbsize = 0;
 641
 642         DPRINTK("   Detailed Timings\n");
 643         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 644         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 645                 if (!(block[0] == 0x00 && block[1] == 0x00)) {
 646                         get_detailed_timing(block, &mode[num]);
 647                         if (first) {
 648                                 mode[num].flag |= FB_MODE_IS_FIRST;
 649                                 first = 0;
 650                         }
 651                         num++;
 652                 }
 653         }
 654
 655         DPRINTK("   Supported VESA Modes\n");
 656         block = edid + ESTABLISHED_TIMING_1;
 657         num += get_est_timing(block, &mode[num]);
 658
 659         DPRINTK("   Standard Timings\n");
 660         block = edid + STD_TIMING_DESCRIPTIONS_START;
 661         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 662                 num += get_std_timing(block, &mode[num], ver, rev, specs);
 663
 664         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 665         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 666                 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 667                         num += get_dst_timing(block + 5, &mode[num],
 668                                               ver, rev, specs);
 669         }
 670
 671         /* Yikes, EDID data is totally useless */
 672         if (!num) {
 673                 kfree(mode);
 674                 return NULL;
 675         }
 676
 677         *dbsize = num;
 678         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 679         if (!m)
 680                 return mode;
 681         memmove(m, mode, num * sizeof(struct fb_videomode));
 682         kfree(mode);
 683         return m;
 684 }
 685
 686 /**
 687  * fb_destroy_modedb - destroys mode database
 688  * @modedb: mode database to destroy
 689  *
 690  * DESCRIPTION:
 691  * Destroy mode database created by fb_create_modedb
 692  */
 693 void fb_destroy_modedb(struct fb_videomode *modedb)
 694 {
 695         kfree(modedb);
 696 }
 697
 698 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 699 {
 700         int i, retval = 1;
 701         unsigned char *block;
 702
 703         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 704
 705         DPRINTK("      Monitor Operating Limits: ");
 706
 707         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 708                 if (edid_is_limits_block(block)) {
 709                         specs->hfmin = H_MIN_RATE * 1000;
 710                         specs->hfmax = H_MAX_RATE * 1000;
 711                         specs->vfmin = V_MIN_RATE;
 712                         specs->vfmax = V_MAX_RATE;
 713                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 714                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 715                         retval = 0;
 716                         DPRINTK("From EDID\n");
 717                         break;
 718                 }
 719         }
 720
 721         /* estimate monitor limits based on modes supported */
 722         if (retval) {
 723                 struct fb_videomode *modes, *mode;
 724                 int num_modes, hz, hscan, pixclock;
 725                 int vtotal, htotal;
 726
 727                 modes = fb_create_modedb(edid, &num_modes, specs);
 728                 if (!modes) {
 729                         DPRINTK("None Available\n");
 730                         return 1;
 731                 }
 732
 733                 retval = 0;
 734                 for (i = 0; i < num_modes; i++) {
 735                         mode = &modes[i];
 736                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 737                         htotal = mode->xres + mode->right_margin + mode->hsync_len
 738                                 + mode->left_margin;
 739                         vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 740                                 + mode->upper_margin;
 741
 742                         if (mode->vmode & FB_VMODE_INTERLACED)
 743                                 vtotal /= 2;
 744
 745                         if (mode->vmode & FB_VMODE_DOUBLE)
 746                                 vtotal *= 2;
 747
 748                         hscan = (pixclock + htotal / 2) / htotal;
 749                         hscan = (hscan + 500) / 1000 * 1000;
 750                         hz = (hscan + vtotal / 2) / vtotal;
 751
 752                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 753                                 specs->dclkmax = pixclock;
 754
 755                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 756                                 specs->dclkmin = pixclock;
 757
 758                         if (specs->hfmax == 0 || specs->hfmax < hscan)
 759                                 specs->hfmax = hscan;
 760
 761                         if (specs->hfmin == 0 || specs->hfmin > hscan)
 762                                 specs->hfmin = hscan;
 763
 764                         if (specs->vfmax == 0 || specs->vfmax < hz)
 765                                 specs->vfmax = hz;
 766
 767                         if (specs->vfmin == 0 || specs->vfmin > hz)
 768                                 specs->vfmin = hz;
 769                 }
 770                 DPRINTK("Extrapolated\n");
 771                 fb_destroy_modedb(modes);
 772         }
 773         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 774                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 775                 specs->vfmax, specs->dclkmax/1000000);
 776         return retval;
 777 }
 778
 779 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 780 {
 781         unsigned char c, *block;
 782
 783         block = edid + EDID_STRUCT_DISPLAY;
 784
 785         fb_get_monitor_limits(edid, specs);
 786
 787         c = block[0] & 0x80;
 788         specs->input = 0;
 789         if (c) {
 790                 specs->input |= FB_DISP_DDI;
 791                 DPRINTK("      Digital Display Input");
 792         } else {
 793                 DPRINTK("      Analog Display Input: Input Voltage - ");
 794                 switch ((block[0] & 0x60) >> 5) {
 795                 case 0:
 796                         DPRINTK("0.700V/0.300V");
 797                         specs->input |= FB_DISP_ANA_700_300;
 798                         break;
 799                 case 1:
 800                         DPRINTK("0.714V/0.286V");
 801                         specs->input |= FB_DISP_ANA_714_286;
 802                         break;
 803                 case 2:
 804                         DPRINTK("1.000V/0.400V");
 805                         specs->input |= FB_DISP_ANA_1000_400;
 806                         break;
 807                 case 3:
 808                         DPRINTK("0.700V/0.000V");
 809                         specs->input |= FB_DISP_ANA_700_000;
 810                         break;
 811                 }
 812         }
 813         DPRINTK("\n      Sync: ");
 814         c = block[0] & 0x10;
 815         if (c)
 816                 DPRINTK("      Configurable signal level\n");
 817         c = block[0] & 0x0f;
 818         specs->signal = 0;
 819         if (c & 0x10) {
 820                 DPRINTK("Blank to Blank ");
 821                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
 822         }
 823         if (c & 0x08) {
 824                 DPRINTK("Separate ");
 825                 specs->signal |= FB_SIGNAL_SEPARATE;
 826         }
 827         if (c & 0x04) {
 828                 DPRINTK("Composite ");
 829                 specs->signal |= FB_SIGNAL_COMPOSITE;
 830         }
 831         if (c & 0x02) {
 832                 DPRINTK("Sync on Green ");
 833                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 834         }
 835         if (c & 0x01) {
 836                 DPRINTK("Serration on ");
 837                 specs->signal |= FB_SIGNAL_SERRATION_ON;
 838         }
 839         DPRINTK("\n");
 840         specs->max_x = block[1];
 841         specs->max_y = block[2];
 842         DPRINTK("      Max H-size in cm: ");
 843         if (specs->max_x)
 844                 DPRINTK("%d\n", specs->max_x);
 845         else
 846                 DPRINTK("variable\n");
 847         DPRINTK("      Max V-size in cm: ");
 848         if (specs->max_y)
 849                 DPRINTK("%d\n", specs->max_y);
 850         else
 851                 DPRINTK("variable\n");
 852
 853         c = block[3];
 854         specs->gamma = c+100;
 855         DPRINTK("      Gamma: ");
 856         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 857
 858         get_dpms_capabilities(block[4], specs);
 859
 860         switch ((block[4] & 0x18) >> 3) {
 861         case 0:
 862                 DPRINTK("      Monochrome/Grayscale\n");
 863                 specs->input |= FB_DISP_MONO;
 864                 break;
 865         case 1:
 866                 DPRINTK("      RGB Color Display\n");
 867                 specs->input |= FB_DISP_RGB;
 868                 break;
 869         case 2:
 870                 DPRINTK("      Non-RGB Multicolor Display\n");
 871                 specs->input |= FB_DISP_MULTI;
 872                 break;
 873         default:
 874                 DPRINTK("      Unknown\n");
 875                 specs->input |= FB_DISP_UNKNOWN;
 876                 break;
 877         }
 878
 879         get_chroma(block, specs);
 880
 881         specs->misc = 0;
 882         c = block[4] & 0x7;
 883         if (c & 0x04) {
 884                 DPRINTK("      Default color format is primary\n");
 885                 specs->misc |= FB_MISC_PRIM_COLOR;
 886         }
 887         if (c & 0x02) {
 888                 DPRINTK("      First DETAILED Timing is preferred\n");
 889                 specs->misc |= FB_MISC_1ST_DETAIL;
 890         }
 891         if (c & 0x01) {
 892                 printk("      Display is GTF capable\n");
 893                 specs->gtf = 1;
 894         }
 895 }
 896
 897 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 898 {
 899         int i;
 900         unsigned char *block;
 901
 902         if (edid == NULL || var == NULL)
 903                 return 1;
 904
 905         if (!(edid_checksum(edid)))
 906                 return 1;
 907
 908         if (!(edid_check_header(edid)))
 909                 return 1;
 910
 911         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 912
 913         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 914                 if (edid_is_timing_block(block)) {
 915                         var->xres = var->xres_virtual = H_ACTIVE;
 916                         var->yres = var->yres_virtual = V_ACTIVE;
 917                         var->height = var->width = 0;
 918                         var->right_margin = H_SYNC_OFFSET;
 919                         var->left_margin = (H_ACTIVE + H_BLANKING) -
 920                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 921                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 922                                 V_SYNC_WIDTH;
 923                         var->lower_margin = V_SYNC_OFFSET;
 924                         var->hsync_len = H_SYNC_WIDTH;
 925                         var->vsync_len = V_SYNC_WIDTH;
 926                         var->pixclock = PIXEL_CLOCK;
 927                         var->pixclock /= 1000;
 928                         var->pixclock = KHZ2PICOS(var->pixclock);
 929
 930                         if (HSYNC_POSITIVE)
 931                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
 932                         if (VSYNC_POSITIVE)
 933                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
 934                         return 0;
 935                 }
 936         }
 937         return 1;
 938 }
 939
 940 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 941 {
 942         unsigned char *block;
 943         int i, found = 0;
 944
 945         if (edid == NULL)
 946                 return;
 947
 948         if (!(edid_checksum(edid)))
 949                 return;
 950
 951         if (!(edid_check_header(edid)))
 952                 return;
 953
 954         memset(specs, 0, sizeof(struct fb_monspecs));
 955
 956         specs->version = edid[EDID_STRUCT_VERSION];
 957         specs->revision = edid[EDID_STRUCT_REVISION];
 958
 959         DPRINTK("========================================\n");
 960         DPRINTK("Display Information (EDID)\n");
 961         DPRINTK("========================================\n");
 962         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 963                (int) specs->revision);
 964
 965         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 966
 967         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 968         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 969                 if (edid_is_serial_block(block)) {
 970                         copy_string(block, specs->serial_no);
 971                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
 972                 } else if (edid_is_ascii_block(block)) {
 973                         copy_string(block, specs->ascii);
 974                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
 975                 } else if (edid_is_monitor_block(block)) {
 976                         copy_string(block, specs->monitor);
 977                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
 978                 }
 979         }
 980
 981         DPRINTK("   Display Characteristics:\n");
 982         get_monspecs(edid, specs);
 983
 984         specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
 985
 986         /*
 987          * Workaround for buggy EDIDs that sets that the first
 988          * detailed timing is preferred but has not detailed
 989          * timing specified
 990          */
 991         for (i = 0; i < specs->modedb_len; i++) {
 992                 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 993                         found = 1;
 994                         break;
 995                 }
 996         }
 997
 998         if (!found)
 999                 specs->misc &= ~FB_MISC_1ST_DETAIL;
1000
1001         DPRINTK("========================================\n");
1002 }
1003
1004 /**
1005  * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
1006  * @edid:       128 byte array with an E-EDID block
1007  * @spacs:      monitor specs to be extended
1008  */
1009 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1010 {
1011         unsigned char *block;
1012         struct fb_videomode *m;
1013         int num = 0, i;
1014         u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
1015         u8 pos = 4, svd_n = 0;
1016
1017         if (!edid)
1018                 return;
1019
1020         if (!edid_checksum(edid))
1021                 return;
1022
1023         if (edid[0] != 0x2 ||
1024             edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1025                 return;
1026
1027         DPRINTK("  Short Video Descriptors\n");
1028
1029         while (pos < edid[2]) {
1030                 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1031                 pr_debug("Data block %u of %u bytes\n", type, len);
1032                 if (type == 2) {
1033                         for (i = pos; i < pos + len; i++) {
1034                                 u8 idx = edid[pos + i] & 0x7f;
1035                                 svd[svd_n++] = idx;
1036                                 pr_debug("N%sative mode #%d\n",
1037                                          edid[pos + i] & 0x80 ? "" : "on-n", idx);
1038                         }
1039                 } else if (type == 3 && len >= 3) {
1040                         /* Check Vendor Specific Data Block.  For HDMI,
1041                            it is always 00-0C-03 for HDMI Licensing, LLC. */
1042                         if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
1043                             edid[pos + 3] == 0)
1044                                 specs->misc |= FB_MISC_HDMI;
1045                 }
1046                 pos += len + 1;
1047         }
1048
1049         block = edid + edid[2];
1050
1051         DPRINTK("  Extended Detailed Timings\n");
1052
1053         for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1054              i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1055                 if (PIXEL_CLOCK)
1056                         edt[num++] = block - edid;
1057
1058         /* Yikes, EDID data is totally useless */
1059         if (!(num + svd_n))
1060                 return;
1061
1062         m = kzalloc((specs->modedb_len + num + svd_n) *
1063                        sizeof(struct fb_videomode), GFP_KERNEL);
1064
1065         if (!m)
1066                 return;
1067
1068         memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1069
1070         for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1071                 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1072                 if (i == specs->modedb_len)
1073                         m[i].flag |= FB_MODE_IS_FIRST;
1074                 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1075         }
1076
1077         for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1078                 int idx = svd[i - specs->modedb_len - num];
1079                 if (!idx || idx > 63) {
1080                         pr_warning("Reserved SVD code %d\n", idx);
1081                 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1082                         pr_warning("Unimplemented SVD code %d\n", idx);
1083                 } else {
1084                         memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1085                         pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1086                                  m[i].xres, m[i].yres, m[i].refresh);
1087                 }
1088         }
1089
1090         kfree(specs->modedb);
1091         specs->modedb = m;
1092         specs->modedb_len = specs->modedb_len + num + svd_n;
1093 }
1094
1095 /*
1096  * VESA Generalized Timing Formula (GTF)
1097  */
1098
1099 #define FLYBACK                     550
1100 #define V_FRONTPORCH                1
1101 #define H_OFFSET                    40
1102 #define H_SCALEFACTOR               20
1103 #define H_BLANKSCALE                128
1104 #define H_GRADIENT                  600
1105 #define C_VAL                       30
1106 #define M_VAL                       300
1107
1108 struct __fb_timings {
1109         u32 dclk;
1110         u32 hfreq;
1111         u32 vfreq;
1112         u32 hactive;
1113         u32 vactive;
1114         u32 hblank;
1115         u32 vblank;
1116         u32 htotal;
1117         u32 vtotal;
1118 };
1119
1120 /**
1121  * fb_get_vblank - get vertical blank time
1122  * @hfreq: horizontal freq
1123  *
1124  * DESCRIPTION:
1125  * vblank = right_margin + vsync_len + left_margin
1126  *
1127  *    given: right_margin = 1 (V_FRONTPORCH)
1128  *           vsync_len    = 3
1129  *           flyback      = 550
1130  *
1131  *                          flyback * hfreq
1132  *           left_margin  = --------------- - vsync_len
1133  *                           1000000
1134  */
1135 static u32 fb_get_vblank(u32 hfreq)
1136 {
1137         u32 vblank;
1138
1139         vblank = (hfreq * FLYBACK)/1000;
1140         vblank = (vblank + 500)/1000;
1141         return (vblank + V_FRONTPORCH);
1142 }
1143
1144 /**
1145  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1146  * @hfreq: horizontal freq
1147  * @xres: horizontal resolution in pixels
1148  *
1149  * DESCRIPTION:
1150  *
1151  *           xres * duty_cycle
1152  * hblank = ------------------
1153  *           100 - duty_cycle
1154  *
1155  * duty cycle = percent of htotal assigned to inactive display
1156  * duty cycle = C - (M/Hfreq)
1157  *
1158  * where: C = ((offset - scale factor) * blank_scale)
1159  *            -------------------------------------- + scale factor
1160  *                        256
1161  *        M = blank_scale * gradient
1162  *
1163  */
1164 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1165 {
1166         u32 c_val, m_val, duty_cycle, hblank;
1167
1168         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1169                  H_SCALEFACTOR) * 1000;
1170         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1171         m_val = (m_val * 1000000)/hfreq;
1172         duty_cycle = c_val - m_val;
1173         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1174         return (hblank);
1175 }
1176
1177 /**
1178  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1179  * @dclk: pixelclock in Hz
1180  * @xres: horizontal resolution in pixels
1181  *
1182  * DESCRIPTION:
1183  *
1184  *           xres * duty_cycle
1185  * hblank = ------------------
1186  *           100 - duty_cycle
1187  *
1188  * duty cycle = percent of htotal assigned to inactive display
1189  * duty cycle = C - (M * h_period)
1190  *
1191  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1192  *                   -----------------------------------------------
1193  *                                    2 * M
1194  *        M = 300;
1195  *        C = 30;
1196
1197  */
1198 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1199 {
1200         u32 duty_cycle, h_period, hblank;
1201
1202         dclk /= 1000;
1203         h_period = 100 - C_VAL;
1204         h_period *= h_period;
1205         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1206         h_period *= 10000;
1207
1208         h_period = int_sqrt(h_period);
1209         h_period -= (100 - C_VAL) * 100;
1210         h_period *= 1000;
1211         h_period /= 2 * M_VAL;
1212
1213         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1214         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1215         hblank &= ~15;
1216         return (hblank);
1217 }
1218
1219 /**
1220  * fb_get_hfreq - estimate hsync
1221  * @vfreq: vertical refresh rate
1222  * @yres: vertical resolution
1223  *
1224  * DESCRIPTION:
1225  *
1226  *          (yres + front_port) * vfreq * 1000000
1227  * hfreq = -------------------------------------
1228  *          (1000000 - (vfreq * FLYBACK)
1229  *
1230  */
1231
1232 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1233 {
1234         u32 divisor, hfreq;
1235
1236         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1237         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1238         return (hfreq/divisor);
1239 }
1240
1241 static void fb_timings_vfreq(struct __fb_timings *timings)
1242 {
1243         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1244         timings->vblank = fb_get_vblank(timings->hfreq);
1245         timings->vtotal = timings->vactive + timings->vblank;
1246         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1247                                                  timings->hactive);
1248         timings->htotal = timings->hactive + timings->hblank;
1249         timings->dclk = timings->htotal * timings->hfreq;
1250 }
1251
1252 static void fb_timings_hfreq(struct __fb_timings *timings)
1253 {
1254         timings->vblank = fb_get_vblank(timings->hfreq);
1255         timings->vtotal = timings->vactive + timings->vblank;
1256         timings->vfreq = timings->hfreq/timings->vtotal;
1257         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1258                                                  timings->hactive);
1259         timings->htotal = timings->hactive + timings->hblank;
1260         timings->dclk = timings->htotal * timings->hfreq;
1261 }
1262
1263 static void fb_timings_dclk(struct __fb_timings *timings)
1264 {
1265         timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1266                                                 timings->hactive);
1267         timings->htotal = timings->hactive + timings->hblank;
1268         timings->hfreq = timings->dclk/timings->htotal;
1269         timings->vblank = fb_get_vblank(timings->hfreq);
1270         timings->vtotal = timings->vactive + timings->vblank;
1271         timings->vfreq = timings->hfreq/timings->vtotal;
1272 }
1273
1274 /*
1275  * fb_get_mode - calculates video mode using VESA GTF
1276  * @flags: if: 0 - maximize vertical refresh rate
1277  *             1 - vrefresh-driven calculation;
1278  *             2 - hscan-driven calculation;
1279  *             3 - pixelclock-driven calculation;
1280  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1281  * @var: pointer to fb_var_screeninfo
1282  * @info: pointer to fb_info
1283  *
1284  * DESCRIPTION:
1285  * Calculates video mode based on monitor specs using VESA GTF.
1286  * The GTF is best for VESA GTF compliant monitors but is
1287  * specifically formulated to work for older monitors as well.
1288  *
1289  * If @flag==0, the function will attempt to maximize the
1290  * refresh rate.  Otherwise, it will calculate timings based on
1291  * the flag and accompanying value.
1292  *
1293  * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1294  * ignored and @var will be filled with the calculated timings.
1295  *
1296  * All calculations are based on the VESA GTF Spreadsheet
1297  * available at VESA's public ftp (http://www.vesa.org).
1298  *
1299  * NOTES:
1300  * The timings generated by the GTF will be different from VESA
1301  * DMT.  It might be a good idea to keep a table of standard
1302  * VESA modes as well.  The GTF may also not work for some displays,
1303  * such as, and especially, analog TV.
1304  *
1305  * REQUIRES:
1306  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1307  */
1308 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1309 {
1310         struct __fb_timings *timings;
1311         u32 interlace = 1, dscan = 1;
1312         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1313
1314
1315         timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1316
1317         if (!timings)
1318                 return -ENOMEM;
1319
1320         /*
1321          * If monspecs are invalid, use values that are enough
1322          * for 640x480@60
1323          */
1324         if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1325             !info->monspecs.dclkmax ||
1326             info->monspecs.hfmax < info->monspecs.hfmin ||
1327             info->monspecs.vfmax < info->monspecs.vfmin ||
1328             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1329                 hfmin = 29000; hfmax = 30000;
1330                 vfmin = 60; vfmax = 60;
1331                 dclkmin = 0; dclkmax = 25000000;
1332         } else {
1333                 hfmin = info->monspecs.hfmin;
1334                 hfmax = info->monspecs.hfmax;
1335                 vfmin = info->monspecs.vfmin;
1336                 vfmax = info->monspecs.vfmax;
1337                 dclkmin = info->monspecs.dclkmin;
1338                 dclkmax = info->monspecs.dclkmax;
1339         }
1340
1341         timings->hactive = var->xres;
1342         timings->vactive = var->yres;
1343         if (var->vmode & FB_VMODE_INTERLACED) {
1344                 timings->vactive /= 2;
1345                 interlace = 2;
1346         }
1347         if (var->vmode & FB_VMODE_DOUBLE) {
1348                 timings->vactive *= 2;
1349                 dscan = 2;
1350         }
1351
1352         switch (flags & ~FB_IGNOREMON) {
1353         case FB_MAXTIMINGS: /* maximize refresh rate */
1354                 timings->hfreq = hfmax;
1355                 fb_timings_hfreq(timings);
1356                 if (timings->vfreq > vfmax) {
1357                         timings->vfreq = vfmax;
1358                         fb_timings_vfreq(timings);
1359                 }
1360                 if (timings->dclk > dclkmax) {
1361                         timings->dclk = dclkmax;
1362                         fb_timings_dclk(timings);
1363                 }
1364                 break;
1365         case FB_VSYNCTIMINGS: /* vrefresh driven */
1366                 timings->vfreq = val;
1367                 fb_timings_vfreq(timings);
1368                 break;
1369         case FB_HSYNCTIMINGS: /* hsync driven */
1370                 timings->hfreq = val;
1371                 fb_timings_hfreq(timings);
1372                 break;
1373         case FB_DCLKTIMINGS: /* pixelclock driven */
1374                 timings->dclk = PICOS2KHZ(val) * 1000;
1375                 fb_timings_dclk(timings);
1376                 break;
1377         default:
1378                 err = -EINVAL;
1379
1380         }
1381
1382         if (err || (!(flags & FB_IGNOREMON) &&
1383             (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1384              timings->hfreq < hfmin || timings->hfreq > hfmax ||
1385              timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1386                 err = -EINVAL;
1387         } else {
1388                 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1389                 var->hsync_len = (timings->htotal * 8)/100;
1390                 var->right_margin = (timings->hblank/2) - var->hsync_len;
1391                 var->left_margin = timings->hblank - var->right_margin -
1392                         var->hsync_len;
1393                 var->vsync_len = (3 * interlace)/dscan;
1394                 var->lower_margin = (1 * interlace)/dscan;
1395                 var->upper_margin = (timings->vblank * interlace)/dscan -
1396                         (var->vsync_len + var->lower_margin);
1397         }
1398
1399         kfree(timings);
1400         return err;
1401 }
1402
1403 #ifdef CONFIG_VIDEOMODE_HELPERS
1404 int fb_videomode_from_videomode(const struct videomode *vm,
1405                                 struct fb_videomode *fbmode)
1406 {
1407         unsigned int htotal, vtotal;
1408
1409         fbmode->xres = vm->hactive;
1410         fbmode->left_margin = vm->hback_porch;
1411         fbmode->right_margin = vm->hfront_porch;
1412         fbmode->hsync_len = vm->hsync_len;
1413
1414         fbmode->yres = vm->vactive;
1415         fbmode->upper_margin = vm->vback_porch;
1416         fbmode->lower_margin = vm->vfront_porch;
1417         fbmode->vsync_len = vm->vsync_len;
1418
1419         /* prevent division by zero in KHZ2PICOS macro */
1420         fbmode->pixclock = vm->pixelclock ?
1421                         KHZ2PICOS(vm->pixelclock / 1000) : 0;
1422
1423         fbmode->sync = 0;
1424         fbmode->vmode = 0;
1425         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1426                 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1427         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1428                 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1429         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1430                 fbmode->vmode |= FB_VMODE_INTERLACED;
1431         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1432                 fbmode->vmode |= FB_VMODE_DOUBLE;
1433         fbmode->flag = 0;
1434
1435         htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1436                  vm->hsync_len;
1437         vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1438                  vm->vsync_len;
1439         /* prevent division by zero */
1440         if (htotal && vtotal) {
1441                 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1442         /* a mode must have htotal and vtotal != 0 or it is invalid */
1443         } else {
1444                 fbmode->refresh = 0;
1445                 return -EINVAL;
1446         }
1447
1448         return 0;
1449 }
1450 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1451
1452 #ifdef CONFIG_OF
1453 static inline void dump_fb_videomode(const struct fb_videomode *m)
1454 {
1455         pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1456                  m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1457                  m->right_margin, m->upper_margin, m->lower_margin,
1458                  m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1459 }
1460
1461 /**
1462  * of_get_fb_videomode - get a fb_videomode from devicetree
1463  * @np: device_node with the timing specification
1464  * @fb: will be set to the return value
1465  * @index: index into the list of display timings in devicetree
1466  *
1467  * DESCRIPTION:
1468  * This function is expensive and should only be used, if only one mode is to be
1469  * read from DT. To get multiple modes start with of_get_display_timings ond
1470  * work with that instead.
1471  */
1472 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1473                         int index)
1474 {
1475         struct videomode vm;
1476         int ret;
1477
1478         ret = of_get_videomode(np, &vm, index);
1479         if (ret)
1480                 return ret;
1481
1482         fb_videomode_from_videomode(&vm, fb);
1483
1484         pr_debug("%s: got %dx%d display mode from %s\n",
1485                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1486         dump_fb_videomode(fb);
1487
1488         return 0;
1489 }
1490 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1491 #endif /* CONFIG_OF */
1492 #endif /* CONFIG_VIDEOMODE_HELPERS */
1493
1494 #else
1495 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1496 {
1497         return 1;
1498 }
1499 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1500 {
1501         specs = NULL;
1502 }
1503 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1504 {
1505 }
1506 void fb_destroy_modedb(struct fb_videomode *modedb)
1507 {
1508 }
1509 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1510                 struct fb_info *info)
1511 {
1512         return -EINVAL;
1513 }
1514 #endif /* CONFIG_FB_MODE_HELPERS */
1515
1516 /*
1517  * fb_validate_mode - validates var against monitor capabilities
1518  * @var: pointer to fb_var_screeninfo
1519  * @info: pointer to fb_info
1520  *
1521  * DESCRIPTION:
1522  * Validates video mode against monitor capabilities specified in
1523  * info->monspecs.
1524  *
1525  * REQUIRES:
1526  * A valid info->monspecs.
1527  */
1528 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1529 {
1530         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1531         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1532
1533         /*
1534          * If monspecs are invalid, use values that are enough
1535          * for 640x480@60
1536          */
1537         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1538             !info->monspecs.dclkmax ||
1539             info->monspecs.hfmax < info->monspecs.hfmin ||
1540             info->monspecs.vfmax < info->monspecs.vfmin ||
1541             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1542                 hfmin = 29000; hfmax = 30000;
1543                 vfmin = 60; vfmax = 60;
1544                 dclkmin = 0; dclkmax = 25000000;
1545         } else {
1546                 hfmin = info->monspecs.hfmin;
1547                 hfmax = info->monspecs.hfmax;
1548                 vfmin = info->monspecs.vfmin;
1549                 vfmax = info->monspecs.vfmax;
1550                 dclkmin = info->monspecs.dclkmin;
1551                 dclkmax = info->monspecs.dclkmax;
1552         }
1553
1554         if (!var->pixclock)
1555                 return -EINVAL;
1556         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1557
1558         htotal = var->xres + var->right_margin + var->hsync_len +
1559                 var->left_margin;
1560         vtotal = var->yres + var->lower_margin + var->vsync_len +
1561                 var->upper_margin;
1562
1563         if (var->vmode & FB_VMODE_INTERLACED)
1564                 vtotal /= 2;
1565         if (var->vmode & FB_VMODE_DOUBLE)
1566                 vtotal *= 2;
1567
1568         hfreq = pixclock/htotal;
1569         hfreq = (hfreq + 500) / 1000 * 1000;
1570
1571         vfreq = hfreq/vtotal;
1572
1573         return (vfreq < vfmin || vfreq > vfmax ||
1574                 hfreq < hfmin || hfreq > hfmax ||
1575                 pixclock < dclkmin || pixclock > dclkmax) ?
1576                 -EINVAL : 0;
1577 }
1578
1579 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1580
1581 /*
1582  * We need to ensure that the EDID block is only returned for
1583  * the primary graphics adapter.
1584  */
1585
1586 const unsigned char *fb_firmware_edid(struct device *device)
1587 {
1588         struct pci_dev *dev = NULL;
1589         struct resource *res = NULL;
1590         unsigned char *edid = NULL;
1591
1592         if (device)
1593                 dev = to_pci_dev(device);
1594
1595         if (dev)
1596                 res = &dev->resource[PCI_ROM_RESOURCE];
1597
1598         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1599                 edid = edid_info.dummy;
1600
1601         return edid;
1602 }
1603 #else
1604 const unsigned char *fb_firmware_edid(struct device *device)
1605 {
1606         return NULL;
1607 }
1608 #endif
1609 EXPORT_SYMBOL(fb_firmware_edid);
1610
1611 EXPORT_SYMBOL(fb_parse_edid);
1612 EXPORT_SYMBOL(fb_edid_to_monspecs);
1613 EXPORT_SYMBOL(fb_edid_add_monspecs);
1614 EXPORT_SYMBOL(fb_get_mode);
1615 EXPORT_SYMBOL(fb_validate_mode);
1616 EXPORT_SYMBOL(fb_destroy_modedb);