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#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
  59struct broken_edid {
  60        u8  manufacturer[4];
  61        u32 model;
  62        u32 fix;
  63};
  64
  65static 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
  86static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
  87        0xff, 0xff, 0xff, 0x00
  88};
  89
  90static 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
 100static 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
 110static 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
 120static 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
 130static 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
 140static 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
 149static 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
 211static 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
 260static 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
 281static 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
 296static 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
 314static 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
 330static 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
 385static 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
 413static 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
 498static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
 499                int ver, int rev)
 500{
 501        int xres, yres = 0, refresh, ratio, i;
 502
 503        xres = (block[0] + 31) * 8;
 504        if (xres <= 256)
 505                return 0;
 506
 507        ratio = (block[1] & 0xc0) >> 6;
 508        switch (ratio) {
 509        case 0:
 510                /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
 511                if (ver < 1 || (ver == 1 && rev < 3))
 512                        yres = xres;
 513                else
 514                        yres = (xres * 10)/16;
 515                break;
 516        case 1:
 517                yres = (xres * 3)/4;
 518                break;
 519        case 2:
 520                yres = (xres * 4)/5;
 521                break;
 522        case 3:
 523                yres = (xres * 9)/16;
 524                break;
 525        }
 526        refresh = (block[1] & 0x3f) + 60;
 527
 528        DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
 529        for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 530                if (vesa_modes[i].xres == xres &&
 531                    vesa_modes[i].yres == yres &&
 532                    vesa_modes[i].refresh == refresh) {
 533                        *mode = vesa_modes[i];
 534                        mode->flag |= FB_MODE_IS_STANDARD;
 535                        return 1;
 536                }
 537        }
 538        calc_mode_timings(xres, yres, refresh, mode);
 539        return 1;
 540}
 541
 542static int get_dst_timing(unsigned char *block,
 543                          struct fb_videomode *mode, int ver, int rev)
 544{
 545        int j, num = 0;
 546
 547        for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
 548                num += get_std_timing(block, &mode[num], ver, rev);
 549
 550        return num;
 551}
 552
 553static void get_detailed_timing(unsigned char *block,
 554                                struct fb_videomode *mode)
 555{
 556        mode->xres = H_ACTIVE;
 557        mode->yres = V_ACTIVE;
 558        mode->pixclock = PIXEL_CLOCK;
 559        mode->pixclock /= 1000;
 560        mode->pixclock = KHZ2PICOS(mode->pixclock);
 561        mode->right_margin = H_SYNC_OFFSET;
 562        mode->left_margin = (H_ACTIVE + H_BLANKING) -
 563                (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 564        mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 565                V_SYNC_WIDTH;
 566        mode->lower_margin = V_SYNC_OFFSET;
 567        mode->hsync_len = H_SYNC_WIDTH;
 568        mode->vsync_len = V_SYNC_WIDTH;
 569        if (HSYNC_POSITIVE)
 570                mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 571        if (VSYNC_POSITIVE)
 572                mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 573        mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
 574                                     (V_ACTIVE + V_BLANKING));
 575        if (INTERLACED) {
 576                mode->yres *= 2;
 577                mode->upper_margin *= 2;
 578                mode->lower_margin *= 2;
 579                mode->vsync_len *= 2;
 580                mode->vmode |= FB_VMODE_INTERLACED;
 581        }
 582        mode->flag = FB_MODE_IS_DETAILED;
 583
 584        DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
 585        DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
 586               H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
 587        DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
 588               V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
 589        DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
 590               (VSYNC_POSITIVE) ? "+" : "-");
 591}
 592
 593/**
 594 * fb_create_modedb - create video mode database
 595 * @edid: EDID data
 596 * @dbsize: database size
 597 *
 598 * RETURNS: struct fb_videomode, @dbsize contains length of database
 599 *
 600 * DESCRIPTION:
 601 * This function builds a mode database using the contents of the EDID
 602 * data
 603 */
 604static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
 605{
 606        struct fb_videomode *mode, *m;
 607        unsigned char *block;
 608        int num = 0, i, first = 1;
 609        int ver, rev;
 610
 611        ver = edid[EDID_STRUCT_VERSION];
 612        rev = edid[EDID_STRUCT_REVISION];
 613
 614        mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
 615        if (mode == NULL)
 616                return NULL;
 617
 618        if (edid == NULL || !edid_checksum(edid) ||
 619            !edid_check_header(edid)) {
 620                kfree(mode);
 621                return NULL;
 622        }
 623
 624        *dbsize = 0;
 625
 626        DPRINTK("   Detailed Timings\n");
 627        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 628        for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 629                if (!(block[0] == 0x00 && block[1] == 0x00)) {
 630                        get_detailed_timing(block, &mode[num]);
 631                        if (first) {
 632                                mode[num].flag |= FB_MODE_IS_FIRST;
 633                                first = 0;
 634                        }
 635                        num++;
 636                }
 637        }
 638
 639        DPRINTK("   Supported VESA Modes\n");
 640        block = edid + ESTABLISHED_TIMING_1;
 641        num += get_est_timing(block, &mode[num]);
 642
 643        DPRINTK("   Standard Timings\n");
 644        block = edid + STD_TIMING_DESCRIPTIONS_START;
 645        for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
 646                num += get_std_timing(block, &mode[num], ver, rev);
 647
 648        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 649        for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
 650                if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
 651                        num += get_dst_timing(block + 5, &mode[num], ver, rev);
 652        }
 653
 654        /* Yikes, EDID data is totally useless */
 655        if (!num) {
 656                kfree(mode);
 657                return NULL;
 658        }
 659
 660        *dbsize = num;
 661        m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
 662        if (!m)
 663                return mode;
 664        memmove(m, mode, num * sizeof(struct fb_videomode));
 665        kfree(mode);
 666        return m;
 667}
 668
 669/**
 670 * fb_destroy_modedb - destroys mode database
 671 * @modedb: mode database to destroy
 672 *
 673 * DESCRIPTION:
 674 * Destroy mode database created by fb_create_modedb
 675 */
 676void fb_destroy_modedb(struct fb_videomode *modedb)
 677{
 678        kfree(modedb);
 679}
 680
 681static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 682{
 683        int i, retval = 1;
 684        unsigned char *block;
 685
 686        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 687
 688        DPRINTK("      Monitor Operating Limits: ");
 689
 690        for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 691                if (edid_is_limits_block(block)) {
 692                        specs->hfmin = H_MIN_RATE * 1000;
 693                        specs->hfmax = H_MAX_RATE * 1000;
 694                        specs->vfmin = V_MIN_RATE;
 695                        specs->vfmax = V_MAX_RATE;
 696                        specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
 697                        specs->gtf = (GTF_SUPPORT) ? 1 : 0;
 698                        retval = 0;
 699                        DPRINTK("From EDID\n");
 700                        break;
 701                }
 702        }
 703
 704        /* estimate monitor limits based on modes supported */
 705        if (retval) {
 706                struct fb_videomode *modes, *mode;
 707                int num_modes, hz, hscan, pixclock;
 708                int vtotal, htotal;
 709
 710                modes = fb_create_modedb(edid, &num_modes);
 711                if (!modes) {
 712                        DPRINTK("None Available\n");
 713                        return 1;
 714                }
 715
 716                retval = 0;
 717                for (i = 0; i < num_modes; i++) {
 718                        mode = &modes[i];
 719                        pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
 720                        htotal = mode->xres + mode->right_margin + mode->hsync_len
 721                                + mode->left_margin;
 722                        vtotal = mode->yres + mode->lower_margin + mode->vsync_len
 723                                + mode->upper_margin;
 724
 725                        if (mode->vmode & FB_VMODE_INTERLACED)
 726                                vtotal /= 2;
 727
 728                        if (mode->vmode & FB_VMODE_DOUBLE)
 729                                vtotal *= 2;
 730
 731                        hscan = (pixclock + htotal / 2) / htotal;
 732                        hscan = (hscan + 500) / 1000 * 1000;
 733                        hz = (hscan + vtotal / 2) / vtotal;
 734
 735                        if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
 736                                specs->dclkmax = pixclock;
 737
 738                        if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
 739                                specs->dclkmin = pixclock;
 740
 741                        if (specs->hfmax == 0 || specs->hfmax < hscan)
 742                                specs->hfmax = hscan;
 743
 744                        if (specs->hfmin == 0 || specs->hfmin > hscan)
 745                                specs->hfmin = hscan;
 746
 747                        if (specs->vfmax == 0 || specs->vfmax < hz)
 748                                specs->vfmax = hz;
 749
 750                        if (specs->vfmin == 0 || specs->vfmin > hz)
 751                                specs->vfmin = hz;
 752                }
 753                DPRINTK("Extrapolated\n");
 754                fb_destroy_modedb(modes);
 755        }
 756        DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
 757                specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
 758                specs->vfmax, specs->dclkmax/1000000);
 759        return retval;
 760}
 761
 762static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 763{
 764        unsigned char c, *block;
 765
 766        block = edid + EDID_STRUCT_DISPLAY;
 767
 768        fb_get_monitor_limits(edid, specs);
 769
 770        c = block[0] & 0x80;
 771        specs->input = 0;
 772        if (c) {
 773                specs->input |= FB_DISP_DDI;
 774                DPRINTK("      Digital Display Input");
 775        } else {
 776                DPRINTK("      Analog Display Input: Input Voltage - ");
 777                switch ((block[0] & 0x60) >> 5) {
 778                case 0:
 779                        DPRINTK("0.700V/0.300V");
 780                        specs->input |= FB_DISP_ANA_700_300;
 781                        break;
 782                case 1:
 783                        DPRINTK("0.714V/0.286V");
 784                        specs->input |= FB_DISP_ANA_714_286;
 785                        break;
 786                case 2:
 787                        DPRINTK("1.000V/0.400V");
 788                        specs->input |= FB_DISP_ANA_1000_400;
 789                        break;
 790                case 3:
 791                        DPRINTK("0.700V/0.000V");
 792                        specs->input |= FB_DISP_ANA_700_000;
 793                        break;
 794                }
 795        }
 796        DPRINTK("\n      Sync: ");
 797        c = block[0] & 0x10;
 798        if (c)
 799                DPRINTK("      Configurable signal level\n");
 800        c = block[0] & 0x0f;
 801        specs->signal = 0;
 802        if (c & 0x10) {
 803                DPRINTK("Blank to Blank ");
 804                specs->signal |= FB_SIGNAL_BLANK_BLANK;
 805        }
 806        if (c & 0x08) {
 807                DPRINTK("Separate ");
 808                specs->signal |= FB_SIGNAL_SEPARATE;
 809        }
 810        if (c & 0x04) {
 811                DPRINTK("Composite ");
 812                specs->signal |= FB_SIGNAL_COMPOSITE;
 813        }
 814        if (c & 0x02) {
 815                DPRINTK("Sync on Green ");
 816                specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
 817        }
 818        if (c & 0x01) {
 819                DPRINTK("Serration on ");
 820                specs->signal |= FB_SIGNAL_SERRATION_ON;
 821        }
 822        DPRINTK("\n");
 823        specs->max_x = block[1];
 824        specs->max_y = block[2];
 825        DPRINTK("      Max H-size in cm: ");
 826        if (specs->max_x)
 827                DPRINTK("%d\n", specs->max_x);
 828        else
 829                DPRINTK("variable\n");
 830        DPRINTK("      Max V-size in cm: ");
 831        if (specs->max_y)
 832                DPRINTK("%d\n", specs->max_y);
 833        else
 834                DPRINTK("variable\n");
 835
 836        c = block[3];
 837        specs->gamma = c+100;
 838        DPRINTK("      Gamma: ");
 839        DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
 840
 841        get_dpms_capabilities(block[4], specs);
 842
 843        switch ((block[4] & 0x18) >> 3) {
 844        case 0:
 845                DPRINTK("      Monochrome/Grayscale\n");
 846                specs->input |= FB_DISP_MONO;
 847                break;
 848        case 1:
 849                DPRINTK("      RGB Color Display\n");
 850                specs->input |= FB_DISP_RGB;
 851                break;
 852        case 2:
 853                DPRINTK("      Non-RGB Multicolor Display\n");
 854                specs->input |= FB_DISP_MULTI;
 855                break;
 856        default:
 857                DPRINTK("      Unknown\n");
 858                specs->input |= FB_DISP_UNKNOWN;
 859                break;
 860        }
 861
 862        get_chroma(block, specs);
 863
 864        specs->misc = 0;
 865        c = block[4] & 0x7;
 866        if (c & 0x04) {
 867                DPRINTK("      Default color format is primary\n");
 868                specs->misc |= FB_MISC_PRIM_COLOR;
 869        }
 870        if (c & 0x02) {
 871                DPRINTK("      First DETAILED Timing is preferred\n");
 872                specs->misc |= FB_MISC_1ST_DETAIL;
 873        }
 874        if (c & 0x01) {
 875                printk("      Display is GTF capable\n");
 876                specs->gtf = 1;
 877        }
 878}
 879
 880int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 881{
 882        int i;
 883        unsigned char *block;
 884
 885        if (edid == NULL || var == NULL)
 886                return 1;
 887
 888        if (!(edid_checksum(edid)))
 889                return 1;
 890
 891        if (!(edid_check_header(edid)))
 892                return 1;
 893
 894        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 895
 896        for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 897                if (edid_is_timing_block(block)) {
 898                        var->xres = var->xres_virtual = H_ACTIVE;
 899                        var->yres = var->yres_virtual = V_ACTIVE;
 900                        var->height = var->width = 0;
 901                        var->right_margin = H_SYNC_OFFSET;
 902                        var->left_margin = (H_ACTIVE + H_BLANKING) -
 903                                (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
 904                        var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
 905                                V_SYNC_WIDTH;
 906                        var->lower_margin = V_SYNC_OFFSET;
 907                        var->hsync_len = H_SYNC_WIDTH;
 908                        var->vsync_len = V_SYNC_WIDTH;
 909                        var->pixclock = PIXEL_CLOCK;
 910                        var->pixclock /= 1000;
 911                        var->pixclock = KHZ2PICOS(var->pixclock);
 912
 913                        if (HSYNC_POSITIVE)
 914                                var->sync |= FB_SYNC_HOR_HIGH_ACT;
 915                        if (VSYNC_POSITIVE)
 916                                var->sync |= FB_SYNC_VERT_HIGH_ACT;
 917                        return 0;
 918                }
 919        }
 920        return 1;
 921}
 922
 923void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 924{
 925        unsigned char *block;
 926        int i, found = 0;
 927
 928        if (edid == NULL)
 929                return;
 930
 931        if (!(edid_checksum(edid)))
 932                return;
 933
 934        if (!(edid_check_header(edid)))
 935                return;
 936
 937        memset(specs, 0, sizeof(struct fb_monspecs));
 938
 939        specs->version = edid[EDID_STRUCT_VERSION];
 940        specs->revision = edid[EDID_STRUCT_REVISION];
 941
 942        DPRINTK("========================================\n");
 943        DPRINTK("Display Information (EDID)\n");
 944        DPRINTK("========================================\n");
 945        DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
 946               (int) specs->revision);
 947
 948        parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
 949
 950        block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 951        for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
 952                if (edid_is_serial_block(block)) {
 953                        copy_string(block, specs->serial_no);
 954                        DPRINTK("   Serial Number: %s\n", specs->serial_no);
 955                } else if (edid_is_ascii_block(block)) {
 956                        copy_string(block, specs->ascii);
 957                        DPRINTK("   ASCII Block: %s\n", specs->ascii);
 958                } else if (edid_is_monitor_block(block)) {
 959                        copy_string(block, specs->monitor);
 960                        DPRINTK("   Monitor Name: %s\n", specs->monitor);
 961                }
 962        }
 963
 964        DPRINTK("   Display Characteristics:\n");
 965        get_monspecs(edid, specs);
 966
 967        specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
 968
 969        /*
 970         * Workaround for buggy EDIDs that sets that the first
 971         * detailed timing is preferred but has not detailed
 972         * timing specified
 973         */
 974        for (i = 0; i < specs->modedb_len; i++) {
 975                if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
 976                        found = 1;
 977                        break;
 978                }
 979        }
 980
 981        if (!found)
 982                specs->misc &= ~FB_MISC_1ST_DETAIL;
 983
 984        DPRINTK("========================================\n");
 985}
 986
 987/**
 988 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
 989 * @edid:       128 byte array with an E-EDID block
 990 * @spacs:      monitor specs to be extended
 991 */
 992void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 993{
 994        unsigned char *block;
 995        struct fb_videomode *m;
 996        int num = 0, i;
 997        u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
 998        u8 pos = 4, svd_n = 0;
 999
1000        if (!edid)
1001                return;
1002
1003        if (!edid_checksum(edid))
1004                return;
1005
1006        if (edid[0] != 0x2 ||
1007            edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1008                return;
1009
1010        DPRINTK("  Short Video Descriptors\n");
1011
1012        while (pos < edid[2]) {
1013                u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1014                pr_debug("Data block %u of %u bytes\n", type, len);
1015                if (type == 2)
1016                        for (i = pos; i < pos + len; i++) {
1017                                u8 idx = edid[pos + i] & 0x7f;
1018                                svd[svd_n++] = idx;
1019                                pr_debug("N%sative mode #%d\n",
1020                                         edid[pos + i] & 0x80 ? "" : "on-n", idx);
1021                        }
1022                pos += len + 1;
1023        }
1024
1025        block = edid + edid[2];
1026
1027        DPRINTK("  Extended Detailed Timings\n");
1028
1029        for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1030             i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1031                if (PIXEL_CLOCK)
1032                        edt[num++] = block - edid;
1033
1034        /* Yikes, EDID data is totally useless */
1035        if (!(num + svd_n))
1036                return;
1037
1038        m = kzalloc((specs->modedb_len + num + svd_n) *
1039                       sizeof(struct fb_videomode), GFP_KERNEL);
1040
1041        if (!m)
1042                return;
1043
1044        memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1045
1046        for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1047                get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1048                if (i == specs->modedb_len)
1049                        m[i].flag |= FB_MODE_IS_FIRST;
1050                pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1051        }
1052
1053        for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1054                int idx = svd[i - specs->modedb_len - num];
1055                if (!idx || idx > 63) {
1056                        pr_warning("Reserved SVD code %d\n", idx);
1057                } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1058                        pr_warning("Unimplemented SVD code %d\n", idx);
1059                } else {
1060                        memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1061                        pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1062                                 m[i].xres, m[i].yres, m[i].refresh);
1063                }
1064        }
1065
1066        kfree(specs->modedb);
1067        specs->modedb = m;
1068        specs->modedb_len = specs->modedb_len + num + svd_n;
1069}
1070
1071/*
1072 * VESA Generalized Timing Formula (GTF)
1073 */
1074
1075#define FLYBACK                     550
1076#define V_FRONTPORCH                1
1077#define H_OFFSET                    40
1078#define H_SCALEFACTOR               20
1079#define H_BLANKSCALE                128
1080#define H_GRADIENT                  600
1081#define C_VAL                       30
1082#define M_VAL                       300
1083
1084struct __fb_timings {
1085        u32 dclk;
1086        u32 hfreq;
1087        u32 vfreq;
1088        u32 hactive;
1089        u32 vactive;
1090        u32 hblank;
1091        u32 vblank;
1092        u32 htotal;
1093        u32 vtotal;
1094};
1095
1096/**
1097 * fb_get_vblank - get vertical blank time
1098 * @hfreq: horizontal freq
1099 *
1100 * DESCRIPTION:
1101 * vblank = right_margin + vsync_len + left_margin
1102 *
1103 *    given: right_margin = 1 (V_FRONTPORCH)
1104 *           vsync_len    = 3
1105 *           flyback      = 550
1106 *
1107 *                          flyback * hfreq
1108 *           left_margin  = --------------- - vsync_len
1109 *                           1000000
1110 */
1111static u32 fb_get_vblank(u32 hfreq)
1112{
1113        u32 vblank;
1114
1115        vblank = (hfreq * FLYBACK)/1000;
1116        vblank = (vblank + 500)/1000;
1117        return (vblank + V_FRONTPORCH);
1118}
1119
1120/**
1121 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1122 * @hfreq: horizontal freq
1123 * @xres: horizontal resolution in pixels
1124 *
1125 * DESCRIPTION:
1126 *
1127 *           xres * duty_cycle
1128 * hblank = ------------------
1129 *           100 - duty_cycle
1130 *
1131 * duty cycle = percent of htotal assigned to inactive display
1132 * duty cycle = C - (M/Hfreq)
1133 *
1134 * where: C = ((offset - scale factor) * blank_scale)
1135 *            -------------------------------------- + scale factor
1136 *                        256
1137 *        M = blank_scale * gradient
1138 *
1139 */
1140static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1141{
1142        u32 c_val, m_val, duty_cycle, hblank;
1143
1144        c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1145                 H_SCALEFACTOR) * 1000;
1146        m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1147        m_val = (m_val * 1000000)/hfreq;
1148        duty_cycle = c_val - m_val;
1149        hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1150        return (hblank);
1151}
1152
1153/**
1154 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1155 * @dclk: pixelclock in Hz
1156 * @xres: horizontal resolution in pixels
1157 *
1158 * DESCRIPTION:
1159 *
1160 *           xres * duty_cycle
1161 * hblank = ------------------
1162 *           100 - duty_cycle
1163 *
1164 * duty cycle = percent of htotal assigned to inactive display
1165 * duty cycle = C - (M * h_period)
1166 *
1167 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1168 *                   -----------------------------------------------
1169 *                                    2 * M
1170 *        M = 300;
1171 *        C = 30;
1172
1173 */
1174static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1175{
1176        u32 duty_cycle, h_period, hblank;
1177
1178        dclk /= 1000;
1179        h_period = 100 - C_VAL;
1180        h_period *= h_period;
1181        h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1182        h_period *= 10000;
1183
1184        h_period = int_sqrt(h_period);
1185        h_period -= (100 - C_VAL) * 100;
1186        h_period *= 1000;
1187        h_period /= 2 * M_VAL;
1188
1189        duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1190        hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1191        hblank &= ~15;
1192        return (hblank);
1193}
1194
1195/**
1196 * fb_get_hfreq - estimate hsync
1197 * @vfreq: vertical refresh rate
1198 * @yres: vertical resolution
1199 *
1200 * DESCRIPTION:
1201 *
1202 *          (yres + front_port) * vfreq * 1000000
1203 * hfreq = -------------------------------------
1204 *          (1000000 - (vfreq * FLYBACK)
1205 *
1206 */
1207
1208static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1209{
1210        u32 divisor, hfreq;
1211
1212        divisor = (1000000 - (vfreq * FLYBACK))/1000;
1213        hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1214        return (hfreq/divisor);
1215}
1216
1217static void fb_timings_vfreq(struct __fb_timings *timings)
1218{
1219        timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1220        timings->vblank = fb_get_vblank(timings->hfreq);
1221        timings->vtotal = timings->vactive + timings->vblank;
1222        timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1223                                                 timings->hactive);
1224        timings->htotal = timings->hactive + timings->hblank;
1225        timings->dclk = timings->htotal * timings->hfreq;
1226}
1227
1228static void fb_timings_hfreq(struct __fb_timings *timings)
1229{
1230        timings->vblank = fb_get_vblank(timings->hfreq);
1231        timings->vtotal = timings->vactive + timings->vblank;
1232        timings->vfreq = timings->hfreq/timings->vtotal;
1233        timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1234                                                 timings->hactive);
1235        timings->htotal = timings->hactive + timings->hblank;
1236        timings->dclk = timings->htotal * timings->hfreq;
1237}
1238
1239static void fb_timings_dclk(struct __fb_timings *timings)
1240{
1241        timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1242                                                timings->hactive);
1243        timings->htotal = timings->hactive + timings->hblank;
1244        timings->hfreq = timings->dclk/timings->htotal;
1245        timings->vblank = fb_get_vblank(timings->hfreq);
1246        timings->vtotal = timings->vactive + timings->vblank;
1247        timings->vfreq = timings->hfreq/timings->vtotal;
1248}
1249
1250/*
1251 * fb_get_mode - calculates video mode using VESA GTF
1252 * @flags: if: 0 - maximize vertical refresh rate
1253 *             1 - vrefresh-driven calculation;
1254 *             2 - hscan-driven calculation;
1255 *             3 - pixelclock-driven calculation;
1256 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1257 * @var: pointer to fb_var_screeninfo
1258 * @info: pointer to fb_info
1259 *
1260 * DESCRIPTION:
1261 * Calculates video mode based on monitor specs using VESA GTF.
1262 * The GTF is best for VESA GTF compliant monitors but is
1263 * specifically formulated to work for older monitors as well.
1264 *
1265 * If @flag==0, the function will attempt to maximize the
1266 * refresh rate.  Otherwise, it will calculate timings based on
1267 * the flag and accompanying value.
1268 *
1269 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1270 * ignored and @var will be filled with the calculated timings.
1271 *
1272 * All calculations are based on the VESA GTF Spreadsheet
1273 * available at VESA's public ftp (http://www.vesa.org).
1274 *
1275 * NOTES:
1276 * The timings generated by the GTF will be different from VESA
1277 * DMT.  It might be a good idea to keep a table of standard
1278 * VESA modes as well.  The GTF may also not work for some displays,
1279 * such as, and especially, analog TV.
1280 *
1281 * REQUIRES:
1282 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1283 */
1284int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1285{
1286        struct __fb_timings *timings;
1287        u32 interlace = 1, dscan = 1;
1288        u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1289
1290
1291        timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1292
1293        if (!timings)
1294                return -ENOMEM;
1295
1296        /*
1297         * If monspecs are invalid, use values that are enough
1298         * for 640x480@60
1299         */
1300        if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1301            !info->monspecs.dclkmax ||
1302            info->monspecs.hfmax < info->monspecs.hfmin ||
1303            info->monspecs.vfmax < info->monspecs.vfmin ||
1304            info->monspecs.dclkmax < info->monspecs.dclkmin) {
1305                hfmin = 29000; hfmax = 30000;
1306                vfmin = 60; vfmax = 60;
1307                dclkmin = 0; dclkmax = 25000000;
1308        } else {
1309                hfmin = info->monspecs.hfmin;
1310                hfmax = info->monspecs.hfmax;
1311                vfmin = info->monspecs.vfmin;
1312                vfmax = info->monspecs.vfmax;
1313                dclkmin = info->monspecs.dclkmin;
1314                dclkmax = info->monspecs.dclkmax;
1315        }
1316
1317        timings->hactive = var->xres;
1318        timings->vactive = var->yres;
1319        if (var->vmode & FB_VMODE_INTERLACED) {
1320                timings->vactive /= 2;
1321                interlace = 2;
1322        }
1323        if (var->vmode & FB_VMODE_DOUBLE) {
1324                timings->vactive *= 2;
1325                dscan = 2;
1326        }
1327
1328        switch (flags & ~FB_IGNOREMON) {
1329        case FB_MAXTIMINGS: /* maximize refresh rate */
1330                timings->hfreq = hfmax;
1331                fb_timings_hfreq(timings);
1332                if (timings->vfreq > vfmax) {
1333                        timings->vfreq = vfmax;
1334                        fb_timings_vfreq(timings);
1335                }
1336                if (timings->dclk > dclkmax) {
1337                        timings->dclk = dclkmax;
1338                        fb_timings_dclk(timings);
1339                }
1340                break;
1341        case FB_VSYNCTIMINGS: /* vrefresh driven */
1342                timings->vfreq = val;
1343                fb_timings_vfreq(timings);
1344                break;
1345        case FB_HSYNCTIMINGS: /* hsync driven */
1346                timings->hfreq = val;
1347                fb_timings_hfreq(timings);
1348                break;
1349        case FB_DCLKTIMINGS: /* pixelclock driven */
1350                timings->dclk = PICOS2KHZ(val) * 1000;
1351                fb_timings_dclk(timings);
1352                break;
1353        default:
1354                err = -EINVAL;
1355
1356        }
1357
1358        if (err || (!(flags & FB_IGNOREMON) &&
1359            (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1360             timings->hfreq < hfmin || timings->hfreq > hfmax ||
1361             timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1362                err = -EINVAL;
1363        } else {
1364                var->pixclock = KHZ2PICOS(timings->dclk/1000);
1365                var->hsync_len = (timings->htotal * 8)/100;
1366                var->right_margin = (timings->hblank/2) - var->hsync_len;
1367                var->left_margin = timings->hblank - var->right_margin -
1368                        var->hsync_len;
1369                var->vsync_len = (3 * interlace)/dscan;
1370                var->lower_margin = (1 * interlace)/dscan;
1371                var->upper_margin = (timings->vblank * interlace)/dscan -
1372                        (var->vsync_len + var->lower_margin);
1373        }
1374
1375        kfree(timings);
1376        return err;
1377}
1378
1379#if IS_ENABLED(CONFIG_VIDEOMODE)
1380int fb_videomode_from_videomode(const struct videomode *vm,
1381                                struct fb_videomode *fbmode)
1382{
1383        unsigned int htotal, vtotal;
1384
1385        fbmode->xres = vm->hactive;
1386        fbmode->left_margin = vm->hback_porch;
1387        fbmode->right_margin = vm->hfront_porch;
1388        fbmode->hsync_len = vm->hsync_len;
1389
1390        fbmode->yres = vm->vactive;
1391        fbmode->upper_margin = vm->vback_porch;
1392        fbmode->lower_margin = vm->vfront_porch;
1393        fbmode->vsync_len = vm->vsync_len;
1394
1395        /* prevent division by zero in KHZ2PICOS macro */
1396        fbmode->pixclock = vm->pixelclock ?
1397                        KHZ2PICOS(vm->pixelclock / 1000) : 0;
1398
1399        fbmode->sync = 0;
1400        fbmode->vmode = 0;
1401        if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
1402                fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1403        if (vm->dmt_flags & VESA_DMT_VSYNC_HIGH)
1404                fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1405        if (vm->data_flags & DISPLAY_FLAGS_INTERLACED)
1406                fbmode->vmode |= FB_VMODE_INTERLACED;
1407        if (vm->data_flags & DISPLAY_FLAGS_DOUBLESCAN)
1408                fbmode->vmode |= FB_VMODE_DOUBLE;
1409        fbmode->flag = 0;
1410
1411        htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1412                 vm->hsync_len;
1413        vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1414                 vm->vsync_len;
1415        /* prevent division by zero */
1416        if (htotal && vtotal) {
1417                fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1418        /* a mode must have htotal and vtotal != 0 or it is invalid */
1419        } else {
1420                fbmode->refresh = 0;
1421                return -EINVAL;
1422        }
1423
1424        return 0;
1425}
1426EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1427#endif
1428
1429#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
1430static inline void dump_fb_videomode(const struct fb_videomode *m)
1431{
1432        pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1433                 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1434                 m->right_margin, m->upper_margin, m->lower_margin,
1435                 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1436}
1437
1438/**
1439 * of_get_fb_videomode - get a fb_videomode from devicetree
1440 * @np: device_node with the timing specification
1441 * @fb: will be set to the return value
1442 * @index: index into the list of display timings in devicetree
1443 *
1444 * DESCRIPTION:
1445 * This function is expensive and should only be used, if only one mode is to be
1446 * read from DT. To get multiple modes start with of_get_display_timings ond
1447 * work with that instead.
1448 */
1449int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1450                        int index)
1451{
1452        struct videomode vm;
1453        int ret;
1454
1455        ret = of_get_videomode(np, &vm, index);
1456        if (ret)
1457                return ret;
1458
1459        fb_videomode_from_videomode(&vm, fb);
1460
1461        pr_debug("%s: got %dx%d display mode from %s\n",
1462                of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1463        dump_fb_videomode(fb);
1464
1465        return 0;
1466}
1467EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1468#endif
1469
1470#else
1471int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1472{
1473        return 1;
1474}
1475void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1476{
1477        specs = NULL;
1478}
1479void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1480{
1481}
1482void fb_destroy_modedb(struct fb_videomode *modedb)
1483{
1484}
1485int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1486                struct fb_info *info)
1487{
1488        return -EINVAL;
1489}
1490#endif /* CONFIG_FB_MODE_HELPERS */
1491
1492/*
1493 * fb_validate_mode - validates var against monitor capabilities
1494 * @var: pointer to fb_var_screeninfo
1495 * @info: pointer to fb_info
1496 *
1497 * DESCRIPTION:
1498 * Validates video mode against monitor capabilities specified in
1499 * info->monspecs.
1500 *
1501 * REQUIRES:
1502 * A valid info->monspecs.
1503 */
1504int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1505{
1506        u32 hfreq, vfreq, htotal, vtotal, pixclock;
1507        u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1508
1509        /*
1510         * If monspecs are invalid, use values that are enough
1511         * for 640x480@60
1512         */
1513        if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1514            !info->monspecs.dclkmax ||
1515            info->monspecs.hfmax < info->monspecs.hfmin ||
1516            info->monspecs.vfmax < info->monspecs.vfmin ||
1517            info->monspecs.dclkmax < info->monspecs.dclkmin) {
1518                hfmin = 29000; hfmax = 30000;
1519                vfmin = 60; vfmax = 60;
1520                dclkmin = 0; dclkmax = 25000000;
1521        } else {
1522                hfmin = info->monspecs.hfmin;
1523                hfmax = info->monspecs.hfmax;
1524                vfmin = info->monspecs.vfmin;
1525                vfmax = info->monspecs.vfmax;
1526                dclkmin = info->monspecs.dclkmin;
1527                dclkmax = info->monspecs.dclkmax;
1528        }
1529
1530        if (!var->pixclock)
1531                return -EINVAL;
1532        pixclock = PICOS2KHZ(var->pixclock) * 1000;
1533
1534        htotal = var->xres + var->right_margin + var->hsync_len +
1535                var->left_margin;
1536        vtotal = var->yres + var->lower_margin + var->vsync_len +
1537                var->upper_margin;
1538
1539        if (var->vmode & FB_VMODE_INTERLACED)
1540                vtotal /= 2;
1541        if (var->vmode & FB_VMODE_DOUBLE)
1542                vtotal *= 2;
1543
1544        hfreq = pixclock/htotal;
1545        hfreq = (hfreq + 500) / 1000 * 1000;
1546
1547        vfreq = hfreq/vtotal;
1548
1549        return (vfreq < vfmin || vfreq > vfmax ||
1550                hfreq < hfmin || hfreq > hfmax ||
1551                pixclock < dclkmin || pixclock > dclkmax) ?
1552                -EINVAL : 0;
1553}
1554
1555#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1556
1557/*
1558 * We need to ensure that the EDID block is only returned for
1559 * the primary graphics adapter.
1560 */
1561
1562const unsigned char *fb_firmware_edid(struct device *device)
1563{
1564        struct pci_dev *dev = NULL;
1565        struct resource *res = NULL;
1566        unsigned char *edid = NULL;
1567
1568        if (device)
1569                dev = to_pci_dev(device);
1570
1571        if (dev)
1572                res = &dev->resource[PCI_ROM_RESOURCE];
1573
1574        if (res && res->flags & IORESOURCE_ROM_SHADOW)
1575                edid = edid_info.dummy;
1576
1577        return edid;
1578}
1579#else
1580const unsigned char *fb_firmware_edid(struct device *device)
1581{
1582        return NULL;
1583}
1584#endif
1585EXPORT_SYMBOL(fb_firmware_edid);
1586
1587EXPORT_SYMBOL(fb_parse_edid);
1588EXPORT_SYMBOL(fb_edid_to_monspecs);
1589EXPORT_SYMBOL(fb_edid_add_monspecs);
1590EXPORT_SYMBOL(fb_get_mode);
1591EXPORT_SYMBOL(fb_validate_mode);
1592EXPORT_SYMBOL(fb_destroy_modedb);
1593
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