drivers/gpu/drm/drm_edid.c

   1 /*
   2  * Copyright (c) 2006 Luc Verhaegen (quirks list)
   3  * Copyright (c) 2007-2008 Intel Corporation
   4  *   Jesse Barnes <jesse.barnes@intel.com>
   5  *
   6  * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
   7  * FB layer.
   8  *   Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a
  11  * copy of this software and associated documentation files (the "Software"),
  12  * to deal in the Software without restriction, including without limitation
  13  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  14  * and/or sell copies of the Software, and to permit persons to whom the
  15  * Software is furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice (including the
  18  * next paragraph) shall be included in all copies or substantial portions
  19  * of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  24  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  26  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  27  * DEALINGS IN THE SOFTWARE.
  28  */
  29 #include <linux/kernel.h>
  30 #include <linux/i2c.h>
  31 #include <linux/i2c-algo-bit.h>
  32 #include "drmP.h"
  33 #include "drm_edid.h"
  34
  35 /*
  36  * TODO:
  37  *   - support EDID 1.4 (incl. CE blocks)
  38  */
  39
  40 /*
  41  * EDID blocks out in the wild have a variety of bugs, try to collect
  42  * them here (note that userspace may work around broken monitors first,
  43  * but fixes should make their way here so that the kernel "just works"
  44  * on as many displays as possible).
  45  */
  46
  47 /* First detailed mode wrong, use largest 60Hz mode */
  48 #define EDID_QUIRK_PREFER_LARGE_60              (1 << 0)
  49 /* Reported 135MHz pixel clock is too high, needs adjustment */
  50 #define EDID_QUIRK_135_CLOCK_TOO_HIGH           (1 << 1)
  51 /* Prefer the largest mode at 75 Hz */
  52 #define EDID_QUIRK_PREFER_LARGE_75              (1 << 2)
  53 /* Detail timing is in cm not mm */
  54 #define EDID_QUIRK_DETAILED_IN_CM               (1 << 3)
  55 /* Detailed timing descriptors have bogus size values, so just take the
  56  * maximum size and use that.
  57  */
  58 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE    (1 << 4)
  59 /* Monitor forgot to set the first detailed is preferred bit. */
  60 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED     (1 << 5)
  61 /* use +hsync +vsync for detailed mode */
  62 #define EDID_QUIRK_DETAILED_SYNC_PP             (1 << 6)
  63
  64 static struct edid_quirk {
  65         char *vendor;
  66         int product_id;
  67         u32 quirks;
  68 } edid_quirk_list[] = {
  69         /* Acer AL1706 */
  70         { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
  71         /* Acer F51 */
  72         { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
  73         /* Unknown Acer */
  74         { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  75
  76         /* Belinea 10 15 55 */
  77         { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
  78         { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
  79
  80         /* Envision Peripherals, Inc. EN-7100e */
  81         { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
  82
  83         /* Funai Electronics PM36B */
  84         { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
  85           EDID_QUIRK_DETAILED_IN_CM },
  86
  87         /* LG Philips LCD LP154W01-A5 */
  88         { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
  89         { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
  90
  91         /* Philips 107p5 CRT */
  92         { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  93
  94         /* Proview AY765C */
  95         { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  96
  97         /* Samsung SyncMaster 205BW.  Note: irony */
  98         { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
  99         /* Samsung SyncMaster 22[5-6]BW */
 100         { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
 101         { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
 102 };
 103
 104
 105 /* Valid EDID header has these bytes */
 106 static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
 107
 108 /**
 109  * edid_is_valid - sanity check EDID data
 110  * @edid: EDID data
 111  *
 112  * Sanity check the EDID block by looking at the header, the version number
 113  * and the checksum.  Return 0 if the EDID doesn't check out, or 1 if it's
 114  * valid.
 115  */
 116 static bool edid_is_valid(struct edid *edid)
 117 {
 118         int i;
 119         u8 csum = 0;
 120         u8 *raw_edid = (u8 *)edid;
 121
 122         if (memcmp(edid->header, edid_header, sizeof(edid_header)))
 123                 goto bad;
 124         if (edid->version != 1) {
 125                 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
 126                 goto bad;
 127         }
 128         if (edid->revision > 3) {
 129                 DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid->revision);
 130                 goto bad;
 131         }
 132
 133         for (i = 0; i < EDID_LENGTH; i++)
 134                 csum += raw_edid[i];
 135         if (csum) {
 136                 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
 137                 goto bad;
 138         }
 139
 140         return 1;
 141
 142 bad:
 143         if (raw_edid) {
 144                 DRM_ERROR("Raw EDID:\n");
 145                 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
 146                 printk("\n");
 147         }
 148         return 0;
 149 }
 150
 151 /**
 152  * edid_vendor - match a string against EDID's obfuscated vendor field
 153  * @edid: EDID to match
 154  * @vendor: vendor string
 155  *
 156  * Returns true if @vendor is in @edid, false otherwise
 157  */
 158 static bool edid_vendor(struct edid *edid, char *vendor)
 159 {
 160         char edid_vendor[3];
 161
 162         edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
 163         edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
 164                           ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
 165         edid_vendor[2] = (edid->mfg_id[2] & 0x1f) + '@';
 166
 167         return !strncmp(edid_vendor, vendor, 3);
 168 }
 169
 170 /**
 171  * edid_get_quirks - return quirk flags for a given EDID
 172  * @edid: EDID to process
 173  *
 174  * This tells subsequent routines what fixes they need to apply.
 175  */
 176 static u32 edid_get_quirks(struct edid *edid)
 177 {
 178         struct edid_quirk *quirk;
 179         int i;
 180
 181         for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
 182                 quirk = &edid_quirk_list[i];
 183
 184                 if (edid_vendor(edid, quirk->vendor) &&
 185                     (EDID_PRODUCT_ID(edid) == quirk->product_id))
 186                         return quirk->quirks;
 187         }
 188
 189         return 0;
 190 }
 191
 192 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
 193 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
 194
 195
 196 /**
 197  * edid_fixup_preferred - set preferred modes based on quirk list
 198  * @connector: has mode list to fix up
 199  * @quirks: quirks list
 200  *
 201  * Walk the mode list for @connector, clearing the preferred status
 202  * on existing modes and setting it anew for the right mode ala @quirks.
 203  */
 204 static void edid_fixup_preferred(struct drm_connector *connector,
 205                                  u32 quirks)
 206 {
 207         struct drm_display_mode *t, *cur_mode, *preferred_mode;
 208         int target_refresh = 0;
 209
 210         if (list_empty(&connector->probed_modes))
 211                 return;
 212
 213         if (quirks & EDID_QUIRK_PREFER_LARGE_60)
 214                 target_refresh = 60;
 215         if (quirks & EDID_QUIRK_PREFER_LARGE_75)
 216                 target_refresh = 75;
 217
 218         preferred_mode = list_first_entry(&connector->probed_modes,
 219                                           struct drm_display_mode, head);
 220
 221         list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
 222                 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
 223
 224                 if (cur_mode == preferred_mode)
 225                         continue;
 226
 227                 /* Largest mode is preferred */
 228                 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
 229                         preferred_mode = cur_mode;
 230
 231                 /* At a given size, try to get closest to target refresh */
 232                 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
 233                     MODE_REFRESH_DIFF(cur_mode, target_refresh) <
 234                     MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
 235                         preferred_mode = cur_mode;
 236                 }
 237         }
 238
 239         preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
 240 }
 241
 242 /**
 243  * drm_mode_std - convert standard mode info (width, height, refresh) into mode
 244  * @t: standard timing params
 245  *
 246  * Take the standard timing params (in this case width, aspect, and refresh)
 247  * and convert them into a real mode using CVT.
 248  *
 249  * Punts for now, but should eventually use the FB layer's CVT based mode
 250  * generation code.
 251  */
 252 struct drm_display_mode *drm_mode_std(struct drm_device *dev,
 253                                       struct std_timing *t)
 254 {
 255         struct drm_display_mode *mode;
 256         int hsize = t->hsize * 8 + 248, vsize;
 257
 258         mode = drm_mode_create(dev);
 259         if (!mode)
 260                 return NULL;
 261
 262         if (t->aspect_ratio == 0)
 263                 vsize = (hsize * 10) / 16;
 264         else if (t->aspect_ratio == 1)
 265                 vsize = (hsize * 3) / 4;
 266         else if (t->aspect_ratio == 2)
 267                 vsize = (hsize * 4) / 5;
 268         else
 269                 vsize = (hsize * 9) / 16;
 270
 271         drm_mode_set_name(mode);
 272
 273         return mode;
 274 }
 275
 276 /**
 277  * drm_mode_detailed - create a new mode from an EDID detailed timing section
 278  * @dev: DRM device (needed to create new mode)
 279  * @edid: EDID block
 280  * @timing: EDID detailed timing info
 281  * @quirks: quirks to apply
 282  *
 283  * An EDID detailed timing block contains enough info for us to create and
 284  * return a new struct drm_display_mode.
 285  */
 286 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
 287                                                   struct edid *edid,
 288                                                   struct detailed_timing *timing,
 289                                                   u32 quirks)
 290 {
 291         struct drm_display_mode *mode;
 292         struct detailed_pixel_timing *pt = &timing->data.pixel_data;
 293
 294         if (pt->stereo) {
 295                 printk(KERN_WARNING "stereo mode not supported\n");
 296                 return NULL;
 297         }
 298         if (!pt->separate_sync) {
 299                 printk(KERN_WARNING "integrated sync not supported\n");
 300                 return NULL;
 301         }
 302
 303         mode = drm_mode_create(dev);
 304         if (!mode)
 305                 return NULL;
 306
 307         mode->type = DRM_MODE_TYPE_DRIVER;
 308
 309         if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
 310                 timing->pixel_clock = 1088;
 311
 312         mode->clock = timing->pixel_clock * 10;
 313
 314         mode->hdisplay = (pt->hactive_hi << 8) | pt->hactive_lo;
 315         mode->hsync_start = mode->hdisplay + ((pt->hsync_offset_hi << 8) |
 316                                               pt->hsync_offset_lo);
 317         mode->hsync_end = mode->hsync_start +
 318                 ((pt->hsync_pulse_width_hi << 8) |
 319                  pt->hsync_pulse_width_lo);
 320         mode->htotal = mode->hdisplay + ((pt->hblank_hi << 8) | pt->hblank_lo);
 321
 322         mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo;
 323         mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 4) |
 324                                               pt->vsync_offset_lo);
 325         mode->vsync_end = mode->vsync_start +
 326                 ((pt->vsync_pulse_width_hi << 4) |
 327                  pt->vsync_pulse_width_lo);
 328         mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo);
 329
 330         drm_mode_set_name(mode);
 331
 332         if (pt->interlaced)
 333                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
 334
 335         if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
 336                 pt->hsync_positive = 1;
 337                 pt->vsync_positive = 1;
 338         }
 339
 340         mode->flags |= pt->hsync_positive ? DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
 341         mode->flags |= pt->vsync_positive ? DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
 342
 343         mode->width_mm = pt->width_mm_lo | (pt->width_mm_hi << 8);
 344         mode->height_mm = pt->height_mm_lo | (pt->height_mm_hi << 8);
 345
 346         if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
 347                 mode->width_mm *= 10;
 348                 mode->height_mm *= 10;
 349         }
 350
 351         if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
 352                 mode->width_mm = edid->width_cm * 10;
 353                 mode->height_mm = edid->height_cm * 10;
 354         }
 355
 356         return mode;
 357 }
 358
 359 /*
 360  * Detailed mode info for the EDID "established modes" data to use.
 361  */
 362 static struct drm_display_mode edid_est_modes[] = {
 363         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
 364                    968, 1056, 0, 600, 601, 605, 628, 0,
 365                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */
 366         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824,
 367                    896, 1024, 0, 600, 601, 603,  625, 0,
 368                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */
 369         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656,
 370                    720, 840, 0, 480, 481, 484, 500, 0,
 371                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */
 372         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664,
 373                    704,  832, 0, 480, 489, 491, 520, 0,
 374                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */
 375         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704,
 376                    768,  864, 0, 480, 483, 486, 525, 0,
 377                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */
 378         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656,
 379                    752, 800, 0, 480, 490, 492, 525, 0,
 380                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */
 381         { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738,
 382                    846, 900, 0, 400, 421, 423,  449, 0,
 383                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */
 384         { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738,
 385                    846,  900, 0, 400, 412, 414, 449, 0,
 386                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */
 387         { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296,
 388                    1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
 389                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */
 390         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040,
 391                    1136, 1312, 0,  768, 769, 772, 800, 0,
 392                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */
 393         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048,
 394                    1184, 1328, 0,  768, 771, 777, 806, 0,
 395                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */
 396         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
 397                    1184, 1344, 0,  768, 771, 777, 806, 0,
 398                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */
 399         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032,
 400                    1208, 1264, 0, 768, 768, 776, 817, 0,
 401                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */
 402         { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864,
 403                    928, 1152, 0, 624, 625, 628, 667, 0,
 404                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */
 405         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816,
 406                    896, 1056, 0, 600, 601, 604,  625, 0,
 407                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */
 408         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856,
 409                    976, 1040, 0, 600, 637, 643, 666, 0,
 410                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */
 411         { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,
 412                    1344, 1600, 0,  864, 865, 868, 900, 0,
 413                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */
 414 };
 415
 416 #define EDID_EST_TIMINGS 16
 417 #define EDID_STD_TIMINGS 8
 418 #define EDID_DETAILED_TIMINGS 4
 419
 420 /**
 421  * add_established_modes - get est. modes from EDID and add them
 422  * @edid: EDID block to scan
 423  *
 424  * Each EDID block contains a bitmap of the supported "established modes" list
 425  * (defined above).  Tease them out and add them to the global modes list.
 426  */
 427 static int add_established_modes(struct drm_connector *connector, struct edid *edid)
 428 {
 429         struct drm_device *dev = connector->dev;
 430         unsigned long est_bits = edid->established_timings.t1 |
 431                 (edid->established_timings.t2 << 8) |
 432                 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
 433         int i, modes = 0;
 434
 435         for (i = 0; i <= EDID_EST_TIMINGS; i++)
 436                 if (est_bits & (1<<i)) {
 437                         struct drm_display_mode *newmode;
 438                         newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
 439                         if (newmode) {
 440                                 drm_mode_probed_add(connector, newmode);
 441                                 modes++;
 442                         }
 443                 }
 444
 445         return modes;
 446 }
 447
 448 /**
 449  * add_standard_modes - get std. modes from EDID and add them
 450  * @edid: EDID block to scan
 451  *
 452  * Standard modes can be calculated using the CVT standard.  Grab them from
 453  * @edid, calculate them, and add them to the list.
 454  */
 455 static int add_standard_modes(struct drm_connector *connector, struct edid *edid)
 456 {
 457         struct drm_device *dev = connector->dev;
 458         int i, modes = 0;
 459
 460         for (i = 0; i < EDID_STD_TIMINGS; i++) {
 461                 struct std_timing *t = &edid->standard_timings[i];
 462                 struct drm_display_mode *newmode;
 463
 464                 /* If std timings bytes are 1, 1 it's empty */
 465                 if (t->hsize == 1 && (t->aspect_ratio | t->vfreq) == 1)
 466                         continue;
 467
 468                 newmode = drm_mode_std(dev, &edid->standard_timings[i]);
 469                 if (newmode) {
 470                         drm_mode_probed_add(connector, newmode);
 471                         modes++;
 472                 }
 473         }
 474
 475         return modes;
 476 }
 477
 478 /**
 479  * add_detailed_modes - get detailed mode info from EDID data
 480  * @connector: attached connector
 481  * @edid: EDID block to scan
 482  * @quirks: quirks to apply
 483  *
 484  * Some of the detailed timing sections may contain mode information.  Grab
 485  * it and add it to the list.
 486  */
 487 static int add_detailed_info(struct drm_connector *connector,
 488                              struct edid *edid, u32 quirks)
 489 {
 490         struct drm_device *dev = connector->dev;
 491         int i, j, modes = 0;
 492
 493         for (i = 0; i < EDID_DETAILED_TIMINGS; i++) {
 494                 struct detailed_timing *timing = &edid->detailed_timings[i];
 495                 struct detailed_non_pixel *data = &timing->data.other_data;
 496                 struct drm_display_mode *newmode;
 497
 498                 /* EDID up to and including 1.2 may put monitor info here */
 499                 if (edid->version == 1 && edid->revision < 3)
 500                         continue;
 501
 502                 /* Detailed mode timing */
 503                 if (timing->pixel_clock) {
 504                         newmode = drm_mode_detailed(dev, edid, timing, quirks);
 505                         if (!newmode)
 506                                 continue;
 507
 508                         /* First detailed mode is preferred */
 509                         if (i == 0 && edid->preferred_timing)
 510                                 newmode->type |= DRM_MODE_TYPE_PREFERRED;
 511                         drm_mode_probed_add(connector, newmode);
 512
 513                         modes++;
 514                         continue;
 515                 }
 516
 517                 /* Other timing or info */
 518                 switch (data->type) {
 519                 case EDID_DETAIL_MONITOR_SERIAL:
 520                         break;
 521                 case EDID_DETAIL_MONITOR_STRING:
 522                         break;
 523                 case EDID_DETAIL_MONITOR_RANGE:
 524                         /* Get monitor range data */
 525                         break;
 526                 case EDID_DETAIL_MONITOR_NAME:
 527                         break;
 528                 case EDID_DETAIL_MONITOR_CPDATA:
 529                         break;
 530                 case EDID_DETAIL_STD_MODES:
 531                         /* Five modes per detailed section */
 532                         for (j = 0; j < 5; i++) {
 533                                 struct std_timing *std;
 534                                 struct drm_display_mode *newmode;
 535
 536                                 std = &data->data.timings[j];
 537                                 newmode = drm_mode_std(dev, std);
 538                                 if (newmode) {
 539                                         drm_mode_probed_add(connector, newmode);
 540                                         modes++;
 541                                 }
 542                         }
 543                         break;
 544                 default:
 545                         break;
 546                 }
 547         }
 548
 549         return modes;
 550 }
 551
 552 #define DDC_ADDR 0x50
 553
 554 unsigned char *drm_do_probe_ddc_edid(struct i2c_adapter *adapter)
 555 {
 556         unsigned char start = 0x0;
 557         unsigned char *buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
 558         struct i2c_msg msgs[] = {
 559                 {
 560                         .addr   = DDC_ADDR,
 561                         .flags  = 0,
 562                         .len    = 1,
 563                         .buf    = &start,
 564                 }, {
 565                         .addr   = DDC_ADDR,
 566                         .flags  = I2C_M_RD,
 567                         .len    = EDID_LENGTH,
 568                         .buf    = buf,
 569                 }
 570         };
 571
 572         if (!buf) {
 573                 dev_warn(&adapter->dev, "unable to allocate memory for EDID "
 574                          "block.\n");
 575                 return NULL;
 576         }
 577
 578         if (i2c_transfer(adapter, msgs, 2) == 2)
 579                 return buf;
 580
 581         dev_info(&adapter->dev, "unable to read EDID block.\n");
 582         kfree(buf);
 583         return NULL;
 584 }
 585 EXPORT_SYMBOL(drm_do_probe_ddc_edid);
 586
 587 static unsigned char *drm_ddc_read(struct i2c_adapter *adapter)
 588 {
 589         struct i2c_algo_bit_data *algo_data = adapter->algo_data;
 590         unsigned char *edid = NULL;
 591         int i, j;
 592
 593         algo_data->setscl(algo_data->data, 1);
 594
 595         for (i = 0; i < 1; i++) {
 596                 /* For some old monitors we need the
 597                  * following process to initialize/stop DDC
 598                  */
 599                 algo_data->setsda(algo_data->data, 1);
 600                 msleep(13);
 601
 602                 algo_data->setscl(algo_data->data, 1);
 603                 for (j = 0; j < 5; j++) {
 604                         msleep(10);
 605                         if (algo_data->getscl(algo_data->data))
 606                                 break;
 607                 }
 608                 if (j == 5)
 609                         continue;
 610
 611                 algo_data->setsda(algo_data->data, 0);
 612                 msleep(15);
 613                 algo_data->setscl(algo_data->data, 0);
 614                 msleep(15);
 615                 algo_data->setsda(algo_data->data, 1);
 616                 msleep(15);
 617
 618                 /* Do the real work */
 619                 edid = drm_do_probe_ddc_edid(adapter);
 620                 algo_data->setsda(algo_data->data, 0);
 621                 algo_data->setscl(algo_data->data, 0);
 622                 msleep(15);
 623
 624                 algo_data->setscl(algo_data->data, 1);
 625                 for (j = 0; j < 10; j++) {
 626                         msleep(10);
 627                         if (algo_data->getscl(algo_data->data))
 628                                 break;
 629                 }
 630
 631                 algo_data->setsda(algo_data->data, 1);
 632                 msleep(15);
 633                 algo_data->setscl(algo_data->data, 0);
 634                 algo_data->setsda(algo_data->data, 0);
 635                 if (edid)
 636                         break;
 637         }
 638         /* Release the DDC lines when done or the Apple Cinema HD display
 639          * will switch off
 640          */
 641         algo_data->setsda(algo_data->data, 1);
 642         algo_data->setscl(algo_data->data, 1);
 643
 644         return edid;
 645 }
 646
 647 /**
 648  * drm_get_edid - get EDID data, if available
 649  * @connector: connector we're probing
 650  * @adapter: i2c adapter to use for DDC
 651  *
 652  * Poke the given connector's i2c channel to grab EDID data if possible.
 653  *
 654  * Return edid data or NULL if we couldn't find any.
 655  */
 656 struct edid *drm_get_edid(struct drm_connector *connector,
 657                           struct i2c_adapter *adapter)
 658 {
 659         struct edid *edid;
 660
 661         edid = (struct edid *)drm_ddc_read(adapter);
 662         if (!edid) {
 663                 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n",
 664                          drm_get_connector_name(connector));
 665                 return NULL;
 666         }
 667         if (!edid_is_valid(edid)) {
 668                 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
 669                          drm_get_connector_name(connector));
 670                 kfree(edid);
 671                 return NULL;
 672         }
 673
 674         connector->display_info.raw_edid = (char *)edid;
 675
 676         return edid;
 677 }
 678 EXPORT_SYMBOL(drm_get_edid);
 679
 680 /**
 681  * drm_add_edid_modes - add modes from EDID data, if available
 682  * @connector: connector we're probing
 683  * @edid: edid data
 684  *
 685  * Add the specified modes to the connector's mode list.
 686  *
 687  * Return number of modes added or 0 if we couldn't find any.
 688  */
 689 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
 690 {
 691         int num_modes = 0;
 692         u32 quirks;
 693
 694         if (edid == NULL) {
 695                 return 0;
 696         }
 697         if (!edid_is_valid(edid)) {
 698                 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
 699                          drm_get_connector_name(connector));
 700                 return 0;
 701         }
 702
 703         quirks = edid_get_quirks(edid);
 704
 705         num_modes += add_established_modes(connector, edid);
 706         num_modes += add_standard_modes(connector, edid);
 707         num_modes += add_detailed_info(connector, edid, quirks);
 708
 709         if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
 710                 edid_fixup_preferred(connector, quirks);
 711
 712         connector->display_info.serration_vsync = edid->serration_vsync;
 713         connector->display_info.sync_on_green = edid->sync_on_green;
 714         connector->display_info.composite_sync = edid->composite_sync;
 715         connector->display_info.separate_syncs = edid->separate_syncs;
 716         connector->display_info.blank_to_black = edid->blank_to_black;
 717         connector->display_info.video_level = edid->video_level;
 718         connector->display_info.digital = edid->digital;
 719         connector->display_info.width_mm = edid->width_cm * 10;
 720         connector->display_info.height_mm = edid->height_cm * 10;
 721         connector->display_info.gamma = edid->gamma;
 722         connector->display_info.gtf_supported = edid->default_gtf;
 723         connector->display_info.standard_color = edid->standard_color;
 724         connector->display_info.display_type = edid->display_type;
 725         connector->display_info.active_off_supported = edid->pm_active_off;
 726         connector->display_info.suspend_supported = edid->pm_suspend;
 727         connector->display_info.standby_supported = edid->pm_standby;
 728         connector->display_info.gamma = edid->gamma;
 729
 730         return num_modes;
 731 }
 732 EXPORT_SYMBOL(drm_add_edid_modes);