linux/drivers/video/fbmon.c
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   1/*
   2 * linux/drivers/video/fbmon.c
   3 *
   4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
   5 *
   6 * Credits:
   7 *
   8 * The EDID Parser is a conglomeration from the following sources:
   9 *
  10 *   1. SciTech SNAP Graphics Architecture
  11 *      Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
  12 *
  13 *   2. XFree86 4.3.0, interpret_edid.c
  14 *      Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
  15 *
  16 *   3. John Fremlin <vii@users.sourceforge.net> and
  17 *      Ani Joshi <ajoshi@unixbox.com>
  18 *
  19 * Generalized Timing Formula is derived from:
  20 *
  21 *      GTF Spreadsheet by Andy Morrish (1/5/97)
  22 *      available at http://www.vesa.org
  23 *
  24 * This file is subject to the terms and conditions of the GNU General Public
  25 * License.  See the file COPYING in the main directory of this archive
  26 * for more details.
  27 *
  28 */
  29#include <linux/fb.h>
  30#include <linux/module.h>
  31#include <linux/pci.h>
  32#include <linux/slab.h>
  33#include <video/edid.h>
  34#ifdef CONFIG_PPC_OF
  35#include <asm/prom.h>
  36#include <asm/pci-bridge.h>
  37#endif
  38#include "edid.h"
  39
  40/*
  41 * EDID parser
  42 */
  43
  44#undef DEBUG  /* define this for verbose EDID parsing output */
  45
  46#ifdef DEBUG
  47#define DPRINTK(fmt, args...) printk(fmt,## args)
  48#else
  49#define DPRINTK(fmt, args...)
  50#endif
  51
  52#define FBMON_FIX_HEADER  1
  53#define FBMON_FIX_INPUT   2
  54#define FBMON_FIX_TIMINGS 3
  55
  56#ifdef CONFIG_FB_MODE_HELPERS
  57struct broken_edid {
  58        u8  manufacturer[4];
  59        u32 model;
  60        u32 fix;
  61};
  62
  63static const struct broken_edid brokendb[] = {
  64        /* DEC FR-PCXAV-YZ */
  65        {
  66                .manufacturer = "DEC",
  67                .model        = 0x073a,
  68                .fix          = FBMON_FIX_HEADER,
  69        },
  70        /* ViewSonic PF775a */
  71        {
  72                .manufacturer = "VSC",
  73                .model        = 0x5a44,
  74                .fix          = FBMON_FIX_INPUT,
  75        },
  76        /* Sharp UXGA? */
  77        {
  78                .manufacturer = "SHP",
  79                .model        = 0x138e,
  80                .fix          = FBMON_FIX_TIMINGS,
  81        },
  82};
  83
  84static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
  85        0xff, 0xff, 0xff, 0x00
  86};
  87
  88static void copy_string(unsigned char *c, unsigned char *s)
  89{
  90  int i;
  91  c = c + 5;
  92  for (i = 0; (i < 13 && *c != 0x0A); i++)
  93    *(s++) = *(c++);
  94  *s = 0;
  95  while (i-- && (*--s == 0x20)) *s = 0;
  96}
  97
  98static int edid_is_serial_block(unsigned char *block)
  99{
 100        if ((block[0] == 0x00) && (block[1] == 0x00) &&
 101            (block[2] == 0x00) && (block[3] == 0xff) &&
 102            (block[4] == 0x00))
 103                return 1;
 104        else
 105                return 0;
 106}
 107
 108static int edid_is_ascii_block(unsigned char *block)
 109{
 110        if ((block[0] == 0x00) && (block[1] == 0x00) &&
 111            (block[2] == 0x00) && (block[3] == 0xfe) &&
 112            (block[4] == 0x00))
 113                return 1;
 114        else
 115                return 0;
 116}
 117
 118static int edid_is_limits_block(unsigned char *block)
 119{
 120        if ((block[0] == 0x00) && (block[1] == 0x00) &&
 121            (block[2] == 0x00) && (block[3] == 0xfd) &&
 122            (block[4] == 0x00))
 123                return 1;
 124        else
 125                return 0;
 126}
 127
 128static int edid_is_monitor_block(unsigned char *block)
 129{
 130        if ((block[0] == 0x00) && (block[1] == 0x00) &&
 131            (block[2] == 0x00) && (block[3] == 0xfc) &&
 132            (block[4] == 0x00))
 133                return 1;
 134        else
 135                return 0;
 136}
 137
 138static int edid_is_timing_block(unsigned char *block)
 139{
 140        if ((block[0] != 0x00) || (block[1] != 0x00) ||
 141            (block[2] != 0x00) || (block[4] != 0x00))
 142                return 1;
 143        else
 144                return 0;
 145}
 146
 147static int check_edid(unsigned char *edid)
 148{
 149        unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
 150        unsigned char *b;
 151        u32 model;
 152        int i, fix = 0, ret = 0;
 153
 154        manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 155        manufacturer[1] = ((block[0] & 0x03) << 3) +
 156                ((block[1] & 0xe0) >> 5) + '@';
 157        manufacturer[2] = (block[1] & 0x1f) + '@';
 158        manufacturer[3] = 0;
 159        model = block[2] + (block[3] << 8);
 160
 161        for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
 162                if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
 163                        brokendb[i].model == model) {
 164                        fix = brokendb[i].fix;
 165                        break;
 166                }
 167        }
 168
 169        switch (fix) {
 170        case FBMON_FIX_HEADER:
 171                for (i = 0; i < 8; i++) {
 172                        if (edid[i] != edid_v1_header[i]) {
 173                                ret = fix;
 174                                break;
 175                        }
 176                }
 177                break;
 178        case FBMON_FIX_INPUT:
 179                b = edid + EDID_STRUCT_DISPLAY;
 180                /* Only if display is GTF capable will
 181                   the input type be reset to analog */
 182                if (b[4] & 0x01 && b[0] & 0x80)
 183                        ret = fix;
 184                break;
 185        case FBMON_FIX_TIMINGS:
 186                b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 187                ret = fix;
 188
 189                for (i = 0; i < 4; i++) {
 190                        if (edid_is_limits_block(b)) {
 191                                ret = 0;
 192                                break;
 193                        }
 194
 195                        b += DETAILED_TIMING_DESCRIPTION_SIZE;
 196                }
 197
 198                break;
 199        }
 200
 201        if (ret)
 202                printk("fbmon: The EDID Block of "
 203                       "Manufacturer: %s Model: 0x%x is known to "
 204                       "be broken,\n",  manufacturer, model);
 205
 206        return ret;
 207}
 208
 209static void fix_edid(unsigned char *edid, int fix)
 210{
 211        int i;
 212        unsigned char *b, csum = 0;
 213
 214        switch (fix) {
 215        case FBMON_FIX_HEADER:
 216                printk("fbmon: trying a header reconstruct\n");
 217                memcpy(edid, edid_v1_header, 8);
 218                break;
 219        case FBMON_FIX_INPUT:
 220                printk("fbmon: trying to fix input type\n");
 221                b = edid + EDID_STRUCT_DISPLAY;
 222                b[0] &= ~0x80;
 223                edid[127] += 0x80;
 224                break;
 225        case FBMON_FIX_TIMINGS:
 226                printk("fbmon: trying to fix monitor timings\n");
 227                b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 228                for (i = 0; i < 4; i++) {
 229                        if (!(edid_is_serial_block(b) ||
 230                              edid_is_ascii_block(b) ||
 231                              edid_is_monitor_block(b) ||
 232                              edid_is_timing_block(b))) {
 233                                b[0] = 0x00;
 234                                b[1] = 0x00;
 235                                b[2] = 0x00;
 236                                b[3] = 0xfd;
 237                                b[4] = 0x00;
 238                                b[5] = 60;   /* vfmin */
 239                                b[6] = 60;   /* vfmax */
 240                                b[7] = 30;   /* hfmin */
 241                                b[8] = 75;   /* hfmax */
 242                                b[9] = 17;   /* pixclock - 170 MHz*/
 243                                b[10] = 0;   /* GTF */
 244                                break;
 245                        }
 246
 247                        b += DETAILED_TIMING_DESCRIPTION_SIZE;
 248                }
 249
 250                for (i = 0; i < EDID_LENGTH - 1; i++)
 251                        csum += edid[i];
 252
 253                edid[127] = 256 - csum;
 254                break;
 255        }
 256}
 257
 258static int edid_checksum(unsigned char *edid)
 259{
 260        unsigned char csum = 0, all_null = 0;
 261        int i, err = 0, fix = check_edid(edid);
 262
 263        if (fix)
 264                fix_edid(edid, fix);
 265
 266        for (i = 0; i < EDID_LENGTH; i++) {
 267                csum += edid[i];
 268                all_null |= edid[i];
 269        }
 270
 271        if (csum == 0x00 && all_null) {
 272                /* checksum passed, everything's good */
 273                err = 1;
 274        }
 275
 276        return err;
 277}
 278
 279static int edid_check_header(unsigned char *edid)
 280{
 281        int i, err = 1, fix = check_edid(edid);
 282
 283        if (fix)
 284                fix_edid(edid, fix);
 285
 286        for (i = 0; i < 8; i++) {
 287                if (edid[i] != edid_v1_header[i])
 288                        err = 0;
 289        }
 290
 291        return err;
 292}
 293
 294static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
 295{
 296        specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
 297        specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
 298                ((block[1] & 0xe0) >> 5) + '@';
 299        specs->manufacturer[2] = (block[1] & 0x1f) + '@';
 300        specs->manufacturer[3] = 0;
 301        specs->model = block[2] + (block[3] << 8);
 302        specs->serial = block[4] + (block[5] << 8) +
 303               (block[6] << 16) + (block[7] << 24);
 304        specs->year = block[9] + 1990;
 305        specs->week = block[8];
 306        DPRINTK("   Manufacturer: %s\n", specs->manufacturer);
 307        DPRINTK("   Model: %x\n", specs->model);
 308        DPRINTK("   Serial#: %u\n", specs->serial);
 309        DPRINTK("   Year: %u Week %u\n", specs->year, specs->week);
 310}
 311
 312static void get_dpms_capabilities(unsigned char flags,
 313                                  struct fb_monspecs *specs)
 314{
 315        specs->dpms = 0;
 316        if (flags & DPMS_ACTIVE_OFF)
 317                specs->dpms |= FB_DPMS_ACTIVE_OFF;
 318        if (flags & DPMS_SUSPEND)
 319                specs->dpms |= FB_DPMS_SUSPEND;
 320        if (flags & DPMS_STANDBY)
 321                specs->dpms |= FB_DPMS_STANDBY;
 322        DPRINTK("      DPMS: Active %s, Suspend %s, Standby %s\n",
 323               (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
 324               (flags & DPMS_SUSPEND)    ? "yes" : "no",
 325               (flags & DPMS_STANDBY)    ? "yes" : "no");
 326}
 327
 328static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
 329{
 330        int tmp;
 331
 332        DPRINTK("      Chroma\n");
 333        /* Chromaticity data */
 334        tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
 335        tmp *= 1000;
 336        tmp += 512;
 337        specs->chroma.redx = tmp/1024;
 338        DPRINTK("         RedX:     0.%03d ", specs->chroma.redx);
 339
 340        tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
 341        tmp *= 1000;
 342        tmp += 512;
 343        specs->chroma.redy = tmp/1024;
 344        DPRINTK("RedY:     0.%03d\n", specs->chroma.redy);
 345
 346        tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
 347        tmp *= 1000;
 348        tmp += 512;
 349        specs->chroma.greenx = tmp/1024;
 350        DPRINTK("         GreenX:   0.%03d ", specs->chroma.greenx);
 351
 352        tmp = (block[5] & 3) | (block[0xa] << 2);
 353        tmp *= 1000;
 354        tmp += 512;
 355        specs->chroma.greeny = tmp/1024;
 356        DPRINTK("GreenY:   0.%03d\n", specs->chroma.greeny);
 357
 358        tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
 359        tmp *= 1000;
 360        tmp += 512;
 361        specs->chroma.bluex = tmp/1024;
 362        DPRINTK("         BlueX:    0.%03d ", specs->chroma.bluex);
 363
 364        tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
 365        tmp *= 1000;
 366        tmp += 512;
 367        specs->chroma.bluey = tmp/1024;
 368        DPRINTK("BlueY:    0.%03d\n", specs->chroma.bluey);
 369
 370        tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
 371        tmp *= 1000;
 372        tmp += 512;
 373        specs->chroma.whitex = tmp/1024;
 374        DPRINTK("         WhiteX:   0.%03d ", specs->chroma.whitex);
 375
 376        tmp = (block[6] & 3) | (block[0xe] << 2);
 377        tmp *= 1000;
 378        tmp += 512;
 379        specs->chroma.whitey = tmp/1024;
 380        DPRINTK("WhiteY:   0.%03d\n", specs->chroma.whitey);
 381}
 382
 383static void calc_mode_timings(int xres, int yres, int refresh,
 384                              struct fb_videomode *mode)
 385{
 386        struct fb_var_screeninfo *var;
 387
 388        var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
 389
 390        if (var) {
 391                var->xres = xres;
 392                var->yres = yres;
 393                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
 394                            refresh, var, NULL);
 395                mode->xres = xres;
 396                mode->yres = yres;
 397                mode->pixclock = var->pixclock;
 398                mode->refresh = refresh;
 399                mode->left_margin = var->left_margin;
 400                mode->right_margin = var->right_margin;
 401                mode->upper_margin = var->upper_margin;
 402                mode->lower_margin = var->lower_margin;
 403                mode->hsync_len = var->hsync_len;
 404                mode->vsync_len = var->vsync_len;
 405                mode->vmode = 0;
 406                mode->sync = 0;
 407                kfree(var);
 408        }
 409}
 410
 411static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
 412{
 413        int num = 0;
 414        unsigned char c;
 415
 416        c = block[0];
 417        if (c&0x80) {
 418                calc_mode_timings(720, 400, 70, &mode[num]);
 419                mode[num++].flag = FB_MODE_IS_CALCULATED;
 420                DPRINTK("      720x400@70Hz\n");
 421        }
 422        if (c&0x40) {
 423                calc_mode_timings(720, 400, 88, &mode[num]);
 424                mode[num++].flag = FB_MODE_IS_CALCULATED;
 425                DPRINTK("      720x400@88Hz\n");
 426        }
 427        if (c&0x20) {
 428                mode[num++] = vesa_modes[3];
 429                DPRINTK("      640x480@60Hz\n");
 430        }
 431        if (c&0x10) {
 432                calc_mode_timings(640, 480, 67, &mode[num]);
 433                mode[num++].flag = FB_MODE_IS_CALCULATED;
 434                DPRINTK("      640x480@67Hz\n");
 435        }
 436        if (c&0x08) {
 437                mode[num++] = vesa_modes[4];
 438                DPRINTK("      640x480@72Hz\n");
 439        }
 440        if (c&0x04) {
 441                mode[num++] = vesa_modes[5];
 442                DPRINTK("      640x480@75Hz\n");
 443        }
 444        if (c&0x02) {
 445                mode[num++] = vesa_modes[7];
 446                DPRINTK("      800x600@56Hz\n");
 447        }
 448        if (c&0x01) {
 449                mode[num++] = vesa_modes[8];
 450                DPRINTK("      800x600@60Hz\n");
 451        }
 452
 453        c = block[1];
 454        if (c&0x80) {
 455                mode[num++] = vesa_modes[9];
 456                DPRINTK("      800x600@72Hz\n");
 457        }
 458        if (c&0x40) {
 459                mode[num++] = vesa_modes[10];
 460                DPRINTK("      800x600@75Hz\n");
 461        }
 462        if (c&0x20) {
 463                calc_mode_timings(832, 624, 75, &mode[num]);
 464                mode[num++].flag = FB_MODE_IS_CALCULATED;
 465                DPRINTK("      832x624@75Hz\n");
 466        }
 467        if (c&0x10) {
 468                mode[num++] = vesa_modes[12];
 469                DPRINTK("      1024x768@87Hz Interlaced\n");
 470        }
 471        if (c&0x08) {
 472                mode[num++] = vesa_modes[13];
 473                DPRINTK("      1024x768@60Hz\n");
 474        }
 475        if (c&0x04) {
 476                mode[num++] = vesa_modes[14];
 477                DPRINTK("      1024x768@70Hz\n");
 478        }
 479        if (c&0x02) {
 480                mode[num++] = vesa_modes[15];
 481                DPRINTK("      1024x768@75Hz\n");
 482        }
 483        if (c&0x01) {
 484                mode[num++] = vesa_modes[21];
 485                DPRINTK("      1280x1024@75Hz\n");
 486        }
 487        c = block[2];
 488        if (c&0x80) {
 489                mode[num++] = vesa_modes[17];
 490                DPRINTK("      1152x870@75Hz\n");
 491        }
 492        DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
 493        return num;
 494}
 495
 496static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
 497                int ver, int rev)
 498{
 499        int xres, yres = 0, refresh, ratio, i;
 500
 501        xres = (block[0] + 31) * 8;
 502        if (xres <= 256)
 503                return 0;
 504
 505        ratio = (block[1] & 0xc0) >> 6;
 506        switch (ratio) {
 507        case 0:
 508                /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
 509                if (ver < 1 || (ver == 1 && rev < 3))
 510                        yres = xres;
 511                else
 512                        yres = (xres * 10)/16;
 513                break;
 514        case 1:
 515                yres = (xres * 3)/4;
 516                break;
 517        case 2:
 518                yres = (xres * 4)/5;
 519                break;
 520        case 3:
 521                yres = (xres * 9)/16;
 522                break;
 523        }
 524        refresh = (block[1] & 0x3f) + 60;
 525
 526        DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 527        for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 528                if (vesa_modes[i].xres == xres &&
 529                    vesa_modes[i].yres == yres &&
 530                    vesa_modes[i].refresh == refresh) {
 531                        *mode = vesa_modes[i];
 532                        mode->flag |= FB_MODE_IS_STANDARD;
 533                        return 1;
 534                }
 535        }
 536        calc_mode_timings(xres, yres, refresh, mode);
 537        return 1;
 538}
 539
 540static int get_dst_timing(unsigned char *block,
 541                          struct fb_videomode *mode, int ver, int rev)
 542{
 543        int j, num = 0;
 544
 545        for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
 546                num += get_std_timing(block, &mode[num], ver, rev);
 547
 548        return num;
 549}
 550
 551static void get_detailed_timing(unsigned char *block,
 552                                struct fb_videomode *mode)
 553{
 554        mode->xres = H_ACTIVE;
 555        mode->yres = V_ACTIVE;
 556        mode->pixclock = PIXEL_CLOCK;
 557        mode->pixclock /= 1000;
 558        mode->pixclock = KHZ2PICOS(mode->pixclock);
 559        mode->right_margin = H_SYNC_OFFSET;
 560        mode->left_margin = (H_ACTIVE + H_BLANKING) -
 561                (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 562        mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 563                V_SYNC_WIDTH;
 564        mode->lower_margin = V_SYNC_OFFSET;
 565        mode->hsync_len = H_SYNC_WIDTH;
 566        mode->vsync_len = V_SYNC_WIDTH;
 567        if (HSYNC_POSITIVE)
 568                mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 569        if (VSYNC_POSITIVE)
 570                mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 571        mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 572                                     (V_ACTIVE + V_BLANKING));
 573        if (INTERLACED) {
 574                mode->yres *= 2;
 575                mode->upper_margin *= 2;
 576                mode->lower_margin *= 2;
 577                mode->vsync_len *= 2;
 578                mode->vmode |= FB_VMODE_INTERLACED;
 579        }
 580        mode->flag = FB_MODE_IS_DETAILED;
 581
 582        DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 583        DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 584               H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 585        DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 586               V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 587        DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 588               (VSYNC_POSITIVE) ? "+" : "-");
 589}
 590
 591/**
 592 * fb_create_modedb - create video mode database
 593 * @edid: EDID data
 594 * @dbsize: database size
 595 *
 596 * RETURNS: struct fb_videomode, @dbsize contains length of database
 597 *
 598 * DESCRIPTION:
 599 * This function builds a mode database using the contents of the EDID
 600 * data
 601 */
 602static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 603{
 604        struct fb_videomode *mode, *m;
 605        unsigned char *block;
 606        int num = 0, i, first = 1;
 607        int ver, rev;
 608
 609        ver = edid[EDID_STRUCT_VERSION];
 610        rev = edid[EDID_STRUCT_REVISION];
 611
 612        mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 613        if (mode == NULL)
 614                return NULL;
 615
 616        if (edid == NULL || !edid_checksum(edid) ||
 617            !edid_check_header(edid)) {
 618                kfree(mode);
 619                return NULL;
 620        }
 621
 622        *dbsize = 0;
 623
 624        DPRINTK("   Detailed Timings\n");
 625        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 626        for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 627                if (!(block[0] == 0x00 && block[1] == 0x00)) {
 628                        get_detailed_timing(block, &mode[num]);
 629                        if (first) {
 630                                mode[num].flag |= FB_MODE_IS_FIRST;
 631                                first = 0;
 632                        }
 633                        num++;
 634                }
 635        }
 636
 637        DPRINTK("   Supported VESA Modes\n");
 638        block = edid + ESTABLISHED_TIMING_1;
 639        num += get_est_timing(block, &mode[num]);
 640
 641        DPRINTK("   Standard Timings\n");
 642        block = edid + STD_TIMING_DESCRIPTIONS_START;
 643        for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 644                num += get_std_timing(block, &mode[num], ver, rev);
 645
 646        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 647        for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 648                if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 649                        num += get_dst_timing(block + 5, &mode[num], ver, rev);
 650        }
 651
 652        /* Yikes, EDID data is totally useless */
 653        if (!num) {
 654                kfree(mode);
 655                return NULL;
 656        }
 657
 658        *dbsize = num;
 659        m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 660        if (!m)
 661                return mode;
 662        memmove(m, mode, num * sizeof(struct fb_videomode));
 663        kfree(mode);
 664        return m;
 665}
 666
 667/**
 668 * fb_destroy_modedb - destroys mode database
 669 * @modedb: mode database to destroy
 670 *
 671 * DESCRIPTION:
 672 * Destroy mode database created by fb_create_modedb
 673 */
 674void fb_destroy_modedb(struct fb_videomode *modedb)
 675{
 676        kfree(modedb);
 677}
 678
 679static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 680{
 681        int i, retval = 1;
 682        unsigned char *block;
 683
 684        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 685
 686        DPRINTK("      Monitor Operating Limits: ");
 687
 688        for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 689                if (edid_is_limits_block(block)) {
 690                        specs->hfmin = H_MIN_RATE * 1000;
 691                        specs->hfmax = H_MAX_RATE * 1000;
 692                        specs->vfmin = V_MIN_RATE;
 693                        specs->vfmax = V_MAX_RATE;
 694                        specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 695                        specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 696                        retval = 0;
 697                        DPRINTK("From EDID\n");
 698                        break;
 699                }
 700        }
 701
 702        /* estimate monitor limits based on modes supported */
 703        if (retval) {
 704                struct fb_videomode *modes, *mode;
 705                int num_modes, hz, hscan, pixclock;
 706                int vtotal, htotal;
 707
 708                modes = fb_create_modedb(edid, &num_modes);
 709                if (!modes) {
 710                        DPRINTK("None Available\n");
 711                        return 1;
 712                }
 713
 714                retval = 0;
 715                for (i = 0; i < num_modes; i++) {
 716                        mode = &modes[i];
 717                        pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 718                        htotal = mode->xres + mode->right_margin + mode->hsync_len
 719                                + mode->left_margin;
 720                        vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 721                                + mode->upper_margin;
 722
 723                        if (mode->vmode & FB_VMODE_INTERLACED)
 724                                vtotal /= 2;
 725
 726                        if (mode->vmode & FB_VMODE_DOUBLE)
 727                                vtotal *= 2;
 728
 729                        hscan = (pixclock + htotal / 2) / htotal;
 730                        hscan = (hscan + 500) / 1000 * 1000;
 731                        hz = (hscan + vtotal / 2) / vtotal;
 732
 733                        if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 734                                specs->dclkmax = pixclock;
 735
 736                        if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 737                                specs->dclkmin = pixclock;
 738
 739                        if (specs->hfmax == 0 || specs->hfmax < hscan)
 740                                specs->hfmax = hscan;
 741
 742                        if (specs->hfmin == 0 || specs->hfmin > hscan)
 743                                specs->hfmin = hscan;
 744
 745                        if (specs->vfmax == 0 || specs->vfmax < hz)
 746                                specs->vfmax = hz;
 747
 748                        if (specs->vfmin == 0 || specs->vfmin > hz)
 749                                specs->vfmin = hz;
 750                }
 751                DPRINTK("Extrapolated\n");
 752                fb_destroy_modedb(modes);
 753        }
 754        DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 755                specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 756                specs->vfmax, specs->dclkmax/1000000);
 757        return retval;
 758}
 759
 760static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 761{
 762        unsigned char c, *block;
 763
 764        block = edid + EDID_STRUCT_DISPLAY;
 765
 766        fb_get_monitor_limits(edid, specs);
 767
 768        c = block[0] & 0x80;
 769        specs->input = 0;
 770        if (c) {
 771                specs->input |= FB_DISP_DDI;
 772                DPRINTK("      Digital Display Input");
 773        } else {
 774                DPRINTK("      Analog Display Input: Input Voltage - ");
 775                switch ((block[0] & 0x60) >> 5) {
 776                case 0:
 777                        DPRINTK("0.700V/0.300V");
 778                        specs->input |= FB_DISP_ANA_700_300;
 779                        break;
 780                case 1:
 781                        DPRINTK("0.714V/0.286V");
 782                        specs->input |= FB_DISP_ANA_714_286;
 783                        break;
 784                case 2:
 785                        DPRINTK("1.000V/0.400V");
 786                        specs->input |= FB_DISP_ANA_1000_400;
 787                        break;
 788                case 3:
 789                        DPRINTK("0.700V/0.000V");
 790                        specs->input |= FB_DISP_ANA_700_000;
 791                        break;
 792                }
 793        }
 794        DPRINTK("\n      Sync: ");
 795        c = block[0] & 0x10;
 796        if (c)
 797                DPRINTK("      Configurable signal level\n");
 798        c = block[0] & 0x0f;
 799        specs->signal = 0;
 800        if (c & 0x10) {
 801                DPRINTK("Blank to Blank ");
 802                specs->signal |= FB_SIGNAL_BLANK_BLANK;
 803        }
 804        if (c & 0x08) {
 805                DPRINTK("Separate ");
 806                specs->signal |= FB_SIGNAL_SEPARATE;
 807        }
 808        if (c & 0x04) {
 809                DPRINTK("Composite ");
 810                specs->signal |= FB_SIGNAL_COMPOSITE;
 811        }
 812        if (c & 0x02) {
 813                DPRINTK("Sync on Green ");
 814                specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 815        }
 816        if (c & 0x01) {
 817                DPRINTK("Serration on ");
 818                specs->signal |= FB_SIGNAL_SERRATION_ON;
 819        }
 820        DPRINTK("\n");
 821        specs->max_x = block[1];
 822        specs->max_y = block[2];
 823        DPRINTK("      Max H-size in cm: ");
 824        if (specs->max_x)
 825                DPRINTK("%d\n", specs->max_x);
 826        else
 827                DPRINTK("variable\n");
 828        DPRINTK("      Max V-size in cm: ");
 829        if (specs->max_y)
 830                DPRINTK("%d\n", specs->max_y);
 831        else
 832                DPRINTK("variable\n");
 833
 834        c = block[3];
 835        specs->gamma = c+100;
 836        DPRINTK("      Gamma: ");
 837        DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 838
 839        get_dpms_capabilities(block[4], specs);
 840
 841        switch ((block[4] & 0x18) >> 3) {
 842        case 0:
 843                DPRINTK("      Monochrome/Grayscale\n");
 844                specs->input |= FB_DISP_MONO;
 845                break;
 846        case 1:
 847                DPRINTK("      RGB Color Display\n");
 848                specs->input |= FB_DISP_RGB;
 849                break;
 850        case 2:
 851                DPRINTK("      Non-RGB Multicolor Display\n");
 852                specs->input |= FB_DISP_MULTI;
 853                break;
 854        default:
 855                DPRINTK("      Unknown\n");
 856                specs->input |= FB_DISP_UNKNOWN;
 857                break;
 858        }
 859
 860        get_chroma(block, specs);
 861
 862        specs->misc = 0;
 863        c = block[4] & 0x7;
 864        if (c & 0x04) {
 865                DPRINTK("      Default color format is primary\n");
 866                specs->misc |= FB_MISC_PRIM_COLOR;
 867        }
 868        if (c & 0x02) {
 869                DPRINTK("      First DETAILED Timing is preferred\n");
 870                specs->misc |= FB_MISC_1ST_DETAIL;
 871        }
 872        if (c & 0x01) {
 873                printk("      Display is GTF capable\n");
 874                specs->gtf = 1;
 875        }
 876}
 877
 878int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 879{
 880        int i;
 881        unsigned char *block;
 882
 883        if (edid == NULL || var == NULL)
 884                return 1;
 885
 886        if (!(edid_checksum(edid)))
 887                return 1;
 888
 889        if (!(edid_check_header(edid)))
 890                return 1;
 891
 892        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 893
 894        for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 895                if (edid_is_timing_block(block)) {
 896                        var->xres = var->xres_virtual = H_ACTIVE;
 897                        var->yres = var->yres_virtual = V_ACTIVE;
 898                        var->height = var->width = 0;
 899                        var->right_margin = H_SYNC_OFFSET;
 900                        var->left_margin = (H_ACTIVE + H_BLANKING) -
 901                                (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 902                        var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 903                                V_SYNC_WIDTH;
 904                        var->lower_margin = V_SYNC_OFFSET;
 905                        var->hsync_len = H_SYNC_WIDTH;
 906                        var->vsync_len = V_SYNC_WIDTH;
 907                        var->pixclock = PIXEL_CLOCK;
 908                        var->pixclock /= 1000;
 909                        var->pixclock = KHZ2PICOS(var->pixclock);
 910
 911                        if (HSYNC_POSITIVE)
 912                                var->sync |= FB_SYNC_HOR_HIGH_ACT;
 913                        if (VSYNC_POSITIVE)
 914                                var->sync |= FB_SYNC_VERT_HIGH_ACT;
 915                        return 0;
 916                }
 917        }
 918        return 1;
 919}
 920
 921void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 922{
 923        unsigned char *block;
 924        int i, found = 0;
 925
 926        if (edid == NULL)
 927                return;
 928
 929        if (!(edid_checksum(edid)))
 930                return;
 931
 932        if (!(edid_check_header(edid)))
 933                return;
 934
 935        memset(specs, 0, sizeof(struct fb_monspecs));
 936
 937        specs->version = edid[EDID_STRUCT_VERSION];
 938        specs->revision = edid[EDID_STRUCT_REVISION];
 939
 940        DPRINTK("========================================\n");
 941        DPRINTK("Display Information (EDID)\n");
 942        DPRINTK("========================================\n");
 943        DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 944               (int) specs->revision);
 945
 946        parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 947
 948        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 949        for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 950                if (edid_is_serial_block(block)) {
 951                        copy_string(block, specs->serial_no);
 952                        DPRINTK("   Serial Number: %s\n", specs->serial_no);
 953                } else if (edid_is_ascii_block(block)) {
 954                        copy_string(block, specs->ascii);
 955                        DPRINTK("   ASCII Block: %s\n", specs->ascii);
 956                } else if (edid_is_monitor_block(block)) {
 957                        copy_string(block, specs->monitor);
 958                        DPRINTK("   Monitor Name: %s\n", specs->monitor);
 959                }
 960        }
 961
 962        DPRINTK("   Display Characteristics:\n");
 963        get_monspecs(edid, specs);
 964
 965        specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 966
 967        /*
 968         * Workaround for buggy EDIDs that sets that the first
 969         * detailed timing is preferred but has not detailed
 970         * timing specified
 971         */
 972        for (i = 0; i < specs->modedb_len; i++) {
 973                if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 974                        found = 1;
 975                        break;
 976                }
 977        }
 978
 979        if (!found)
 980                specs->misc &= ~FB_MISC_1ST_DETAIL;
 981
 982        DPRINTK("========================================\n");
 983}
 984
 985/**
 986 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
 987 * @edid:       128 byte array with an E-EDID block
 988 * @spacs:      monitor specs to be extended
 989 */
 990void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 991{
 992        unsigned char *block;
 993        struct fb_videomode *m;
 994        int num = 0, i;
 995        u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
 996        u8 pos = 4, svd_n = 0;
 997
 998        if (!edid)
 999                return;
1000
1001        if (!edid_checksum(edid))
1002                return;
1003
1004        if (edid[0] != 0x2 ||
1005            edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1006                return;
1007
1008        DPRINTK("  Short Video Descriptors\n");
1009
1010        while (pos < edid[2]) {
1011                u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1012                pr_debug("Data block %u of %u bytes\n", type, len);
1013                if (type == 2)
1014                        for (i = pos; i < pos + len; i++) {
1015                                u8 idx = edid[pos + i] & 0x7f;
1016                                svd[svd_n++] = idx;
1017                                pr_debug("N%sative mode #%d\n",
1018                                         edid[pos + i] & 0x80 ? "" : "on-n", idx);
1019                        }
1020                pos += len + 1;
1021        }
1022
1023        block = edid + edid[2];
1024
1025        DPRINTK("  Extended Detailed Timings\n");
1026
1027        for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1028             i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1029                if (PIXEL_CLOCK)
1030                        edt[num++] = block - edid;
1031
1032        /* Yikes, EDID data is totally useless */
1033        if (!(num + svd_n))
1034                return;
1035
1036        m = kzalloc((specs->modedb_len + num + svd_n) *
1037                       sizeof(struct fb_videomode), GFP_KERNEL);
1038
1039        if (!m)
1040                return;
1041
1042        memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1043
1044        for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1045                get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1046                if (i == specs->modedb_len)
1047                        m[i].flag |= FB_MODE_IS_FIRST;
1048                pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1049        }
1050
1051        for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1052                int idx = svd[i - specs->modedb_len - num];
1053                if (!idx || idx > 63) {
1054                        pr_warning("Reserved SVD code %d\n", idx);
1055                } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1056                        pr_warning("Unimplemented SVD code %d\n", idx);
1057                } else {
1058                        memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1059                        pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1060                                 m[i].xres, m[i].yres, m[i].refresh);
1061                }
1062        }
1063
1064        kfree(specs->modedb);
1065        specs->modedb = m;
1066        specs->modedb_len = specs->modedb_len + num + svd_n;
1067}
1068
1069/*
1070 * VESA Generalized Timing Formula (GTF)
1071 */
1072
1073#define FLYBACK                     550
1074#define V_FRONTPORCH                1
1075#define H_OFFSET                    40
1076#define H_SCALEFACTOR               20
1077#define H_BLANKSCALE                128
1078#define H_GRADIENT                  600
1079#define C_VAL                       30
1080#define M_VAL                       300
1081
1082struct __fb_timings {
1083        u32 dclk;
1084        u32 hfreq;
1085        u32 vfreq;
1086        u32 hactive;
1087        u32 vactive;
1088        u32 hblank;
1089        u32 vblank;
1090        u32 htotal;
1091        u32 vtotal;
1092};
1093
1094/**
1095 * fb_get_vblank - get vertical blank time
1096 * @hfreq: horizontal freq
1097 *
1098 * DESCRIPTION:
1099 * vblank = right_margin + vsync_len + left_margin
1100 *
1101 *    given: right_margin = 1 (V_FRONTPORCH)
1102 *           vsync_len    = 3
1103 *           flyback      = 550
1104 *
1105 *                          flyback * hfreq
1106 *           left_margin  = --------------- - vsync_len
1107 *                           1000000
1108 */
1109static u32 fb_get_vblank(u32 hfreq)
1110{
1111        u32 vblank;
1112
1113        vblank = (hfreq * FLYBACK)/1000;
1114        vblank = (vblank + 500)/1000;
1115        return (vblank + V_FRONTPORCH);
1116}
1117
1118/**
1119 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1120 * @hfreq: horizontal freq
1121 * @xres: horizontal resolution in pixels
1122 *
1123 * DESCRIPTION:
1124 *
1125 *           xres * duty_cycle
1126 * hblank = ------------------
1127 *           100 - duty_cycle
1128 *
1129 * duty cycle = percent of htotal assigned to inactive display
1130 * duty cycle = C - (M/Hfreq)
1131 *
1132 * where: C = ((offset - scale factor) * blank_scale)
1133 *            -------------------------------------- + scale factor
1134 *                        256
1135 *        M = blank_scale * gradient
1136 *
1137 */
1138static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1139{
1140        u32 c_val, m_val, duty_cycle, hblank;
1141
1142        c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1143                 H_SCALEFACTOR) * 1000;
1144        m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1145        m_val = (m_val * 1000000)/hfreq;
1146        duty_cycle = c_val - m_val;
1147        hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1148        return (hblank);
1149}
1150
1151/**
1152 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1153 * @dclk: pixelclock in Hz
1154 * @xres: horizontal resolution in pixels
1155 *
1156 * DESCRIPTION:
1157 *
1158 *           xres * duty_cycle
1159 * hblank = ------------------
1160 *           100 - duty_cycle
1161 *
1162 * duty cycle = percent of htotal assigned to inactive display
1163 * duty cycle = C - (M * h_period)
1164 *
1165 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1166 *                   -----------------------------------------------
1167 *                                    2 * M
1168 *        M = 300;
1169 *        C = 30;
1170
1171 */
1172static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1173{
1174        u32 duty_cycle, h_period, hblank;
1175
1176        dclk /= 1000;
1177        h_period = 100 - C_VAL;
1178        h_period *= h_period;
1179        h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1180        h_period *= 10000;
1181
1182        h_period = int_sqrt(h_period);
1183        h_period -= (100 - C_VAL) * 100;
1184        h_period *= 1000;
1185        h_period /= 2 * M_VAL;
1186
1187        duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1188        hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1189        hblank &= ~15;
1190        return (hblank);
1191}
1192
1193/**
1194 * fb_get_hfreq - estimate hsync
1195 * @vfreq: vertical refresh rate
1196 * @yres: vertical resolution
1197 *
1198 * DESCRIPTION:
1199 *
1200 *          (yres + front_port) * vfreq * 1000000
1201 * hfreq = -------------------------------------
1202 *          (1000000 - (vfreq * FLYBACK)
1203 *
1204 */
1205
1206static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1207{
1208        u32 divisor, hfreq;
1209
1210        divisor = (1000000 - (vfreq * FLYBACK))/1000;
1211        hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1212        return (hfreq/divisor);
1213}
1214
1215static void fb_timings_vfreq(struct __fb_timings *timings)
1216{
1217        timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1218        timings->vblank = fb_get_vblank(timings->hfreq);
1219        timings->vtotal = timings->vactive + timings->vblank;
1220        timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1221                                                 timings->hactive);
1222        timings->htotal = timings->hactive + timings->hblank;
1223        timings->dclk = timings->htotal * timings->hfreq;
1224}
1225
1226static void fb_timings_hfreq(struct __fb_timings *timings)
1227{
1228        timings->vblank = fb_get_vblank(timings->hfreq);
1229        timings->vtotal = timings->vactive + timings->vblank;
1230        timings->vfreq = timings->hfreq/timings->vtotal;
1231        timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1232                                                 timings->hactive);
1233        timings->htotal = timings->hactive + timings->hblank;
1234        timings->dclk = timings->htotal * timings->hfreq;
1235}
1236
1237static void fb_timings_dclk(struct __fb_timings *timings)
1238{
1239        timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1240                                                timings->hactive);
1241        timings->htotal = timings->hactive + timings->hblank;
1242        timings->hfreq = timings->dclk/timings->htotal;
1243        timings->vblank = fb_get_vblank(timings->hfreq);
1244        timings->vtotal = timings->vactive + timings->vblank;
1245        timings->vfreq = timings->hfreq/timings->vtotal;
1246}
1247
1248/*
1249 * fb_get_mode - calculates video mode using VESA GTF
1250 * @flags: if: 0 - maximize vertical refresh rate
1251 *             1 - vrefresh-driven calculation;
1252 *             2 - hscan-driven calculation;
1253 *             3 - pixelclock-driven calculation;
1254 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1255 * @var: pointer to fb_var_screeninfo
1256 * @info: pointer to fb_info
1257 *
1258 * DESCRIPTION:
1259 * Calculates video mode based on monitor specs using VESA GTF.
1260 * The GTF is best for VESA GTF compliant monitors but is
1261 * specifically formulated to work for older monitors as well.
1262 *
1263 * If @flag==0, the function will attempt to maximize the
1264 * refresh rate.  Otherwise, it will calculate timings based on
1265 * the flag and accompanying value.
1266 *
1267 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1268 * ignored and @var will be filled with the calculated timings.
1269 *
1270 * All calculations are based on the VESA GTF Spreadsheet
1271 * available at VESA's public ftp (http://www.vesa.org).
1272 *
1273 * NOTES:
1274 * The timings generated by the GTF will be different from VESA
1275 * DMT.  It might be a good idea to keep a table of standard
1276 * VESA modes as well.  The GTF may also not work for some displays,
1277 * such as, and especially, analog TV.
1278 *
1279 * REQUIRES:
1280 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1281 */
1282int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1283{
1284        struct __fb_timings *timings;
1285        u32 interlace = 1, dscan = 1;
1286        u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1287
1288
1289        timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1290
1291        if (!timings)
1292                return -ENOMEM;
1293
1294        /*
1295         * If monspecs are invalid, use values that are enough
1296         * for 640x480@60
1297         */
1298        if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1299            !info->monspecs.dclkmax ||
1300            info->monspecs.hfmax < info->monspecs.hfmin ||
1301            info->monspecs.vfmax < info->monspecs.vfmin ||
1302            info->monspecs.dclkmax < info->monspecs.dclkmin) {
1303                hfmin = 29000; hfmax = 30000;
1304                vfmin = 60; vfmax = 60;
1305                dclkmin = 0; dclkmax = 25000000;
1306        } else {
1307                hfmin = info->monspecs.hfmin;
1308                hfmax = info->monspecs.hfmax;
1309                vfmin = info->monspecs.vfmin;
1310                vfmax = info->monspecs.vfmax;
1311                dclkmin = info->monspecs.dclkmin;
1312                dclkmax = info->monspecs.dclkmax;
1313        }
1314
1315        timings->hactive = var->xres;
1316        timings->vactive = var->yres;
1317        if (var->vmode & FB_VMODE_INTERLACED) {
1318                timings->vactive /= 2;
1319                interlace = 2;
1320        }
1321        if (var->vmode & FB_VMODE_DOUBLE) {
1322                timings->vactive *= 2;
1323                dscan = 2;
1324        }
1325
1326        switch (flags & ~FB_IGNOREMON) {
1327        case FB_MAXTIMINGS: /* maximize refresh rate */
1328                timings->hfreq = hfmax;
1329                fb_timings_hfreq(timings);
1330                if (timings->vfreq > vfmax) {
1331                        timings->vfreq = vfmax;
1332                        fb_timings_vfreq(timings);
1333                }
1334                if (timings->dclk > dclkmax) {
1335                        timings->dclk = dclkmax;
1336                        fb_timings_dclk(timings);
1337                }
1338                break;
1339        case FB_VSYNCTIMINGS: /* vrefresh driven */
1340                timings->vfreq = val;
1341                fb_timings_vfreq(timings);
1342                break;
1343        case FB_HSYNCTIMINGS: /* hsync driven */
1344                timings->hfreq = val;
1345                fb_timings_hfreq(timings);
1346                break;
1347        case FB_DCLKTIMINGS: /* pixelclock driven */
1348                timings->dclk = PICOS2KHZ(val) * 1000;
1349                fb_timings_dclk(timings);
1350                break;
1351        default:
1352                err = -EINVAL;
1353
1354        }
1355
1356        if (err || (!(flags & FB_IGNOREMON) &&
1357            (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1358             timings->hfreq < hfmin || timings->hfreq > hfmax ||
1359             timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1360                err = -EINVAL;
1361        } else {
1362                var->pixclock = KHZ2PICOS(timings->dclk/1000);
1363                var->hsync_len = (timings->htotal * 8)/100;
1364                var->right_margin = (timings->hblank/2) - var->hsync_len;
1365                var->left_margin = timings->hblank - var->right_margin -
1366                        var->hsync_len;
1367                var->vsync_len = (3 * interlace)/dscan;
1368                var->lower_margin = (1 * interlace)/dscan;
1369                var->upper_margin = (timings->vblank * interlace)/dscan -
1370                        (var->vsync_len + var->lower_margin);
1371        }
1372
1373        kfree(timings);
1374        return err;
1375}
1376#else
1377int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1378{
1379        return 1;
1380}
1381void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1382{
1383        specs = NULL;
1384}
1385void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1386{
1387}
1388void fb_destroy_modedb(struct fb_videomode *modedb)
1389{
1390}
1391int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1392                struct fb_info *info)
1393{
1394        return -EINVAL;
1395}
1396#endif /* CONFIG_FB_MODE_HELPERS */
1397
1398/*
1399 * fb_validate_mode - validates var against monitor capabilities
1400 * @var: pointer to fb_var_screeninfo
1401 * @info: pointer to fb_info
1402 *
1403 * DESCRIPTION:
1404 * Validates video mode against monitor capabilities specified in
1405 * info->monspecs.
1406 *
1407 * REQUIRES:
1408 * A valid info->monspecs.
1409 */
1410int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1411{
1412        u32 hfreq, vfreq, htotal, vtotal, pixclock;
1413        u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1414
1415        /*
1416         * If monspecs are invalid, use values that are enough
1417         * for 640x480@60
1418         */
1419        if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1420            !info->monspecs.dclkmax ||
1421            info->monspecs.hfmax < info->monspecs.hfmin ||
1422            info->monspecs.vfmax < info->monspecs.vfmin ||
1423            info->monspecs.dclkmax < info->monspecs.dclkmin) {
1424                hfmin = 29000; hfmax = 30000;
1425                vfmin = 60; vfmax = 60;
1426                dclkmin = 0; dclkmax = 25000000;
1427        } else {
1428                hfmin = info->monspecs.hfmin;
1429                hfmax = info->monspecs.hfmax;
1430                vfmin = info->monspecs.vfmin;
1431                vfmax = info->monspecs.vfmax;
1432                dclkmin = info->monspecs.dclkmin;
1433                dclkmax = info->monspecs.dclkmax;
1434        }
1435
1436        if (!var->pixclock)
1437                return -EINVAL;
1438        pixclock = PICOS2KHZ(var->pixclock) * 1000;
1439
1440        htotal = var->xres + var->right_margin + var->hsync_len +
1441                var->left_margin;
1442        vtotal = var->yres + var->lower_margin + var->vsync_len +
1443                var->upper_margin;
1444
1445        if (var->vmode & FB_VMODE_INTERLACED)
1446                vtotal /= 2;
1447        if (var->vmode & FB_VMODE_DOUBLE)
1448                vtotal *= 2;
1449
1450        hfreq = pixclock/htotal;
1451        hfreq = (hfreq + 500) / 1000 * 1000;
1452
1453        vfreq = hfreq/vtotal;
1454
1455        return (vfreq < vfmin || vfreq > vfmax ||
1456                hfreq < hfmin || hfreq > hfmax ||
1457                pixclock < dclkmin || pixclock > dclkmax) ?
1458                -EINVAL : 0;
1459}
1460
1461#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1462
1463/*
1464 * We need to ensure that the EDID block is only returned for
1465 * the primary graphics adapter.
1466 */
1467
1468const unsigned char *fb_firmware_edid(struct device *device)
1469{
1470        struct pci_dev *dev = NULL;
1471        struct resource *res = NULL;
1472        unsigned char *edid = NULL;
1473
1474        if (device)
1475                dev = to_pci_dev(device);
1476
1477        if (dev)
1478                res = &dev->resource[PCI_ROM_RESOURCE];
1479
1480        if (res && res->flags & IORESOURCE_ROM_SHADOW)
1481                edid = edid_info.dummy;
1482
1483        return edid;
1484}
1485#else
1486const unsigned char *fb_firmware_edid(struct device *device)
1487{
1488        return NULL;
1489}
1490#endif
1491EXPORT_SYMBOL(fb_firmware_edid);
1492
1493EXPORT_SYMBOL(fb_parse_edid);
1494EXPORT_SYMBOL(fb_edid_to_monspecs);
1495EXPORT_SYMBOL(fb_edid_add_monspecs);
1496EXPORT_SYMBOL(fb_get_mode);
1497EXPORT_SYMBOL(fb_validate_mode);
1498EXPORT_SYMBOL(fb_destroy_modedb);
1499
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