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 > 4)
 129                 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
 130
 131         for (i = 0; i < EDID_LENGTH; i++)
 132                 csum += raw_edid[i];
 133         if (csum) {
 134                 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
 135                 goto bad;
 136         }
 137
 138         return 1;
 139
 140 bad:
 141         if (raw_edid) {
 142                 DRM_ERROR("Raw EDID:\n");
 143                 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
 144                 printk("\n");
 145         }
 146         return 0;
 147 }
 148
 149 /**
 150  * edid_vendor - match a string against EDID's obfuscated vendor field
 151  * @edid: EDID to match
 152  * @vendor: vendor string
 153  *
 154  * Returns true if @vendor is in @edid, false otherwise
 155  */
 156 static bool edid_vendor(struct edid *edid, char *vendor)
 157 {
 158         char edid_vendor[3];
 159
 160         edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
 161         edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
 162                           ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
 163         edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
 164
 165         return !strncmp(edid_vendor, vendor, 3);
 166 }
 167
 168 /**
 169  * edid_get_quirks - return quirk flags for a given EDID
 170  * @edid: EDID to process
 171  *
 172  * This tells subsequent routines what fixes they need to apply.
 173  */
 174 static u32 edid_get_quirks(struct edid *edid)
 175 {
 176         struct edid_quirk *quirk;
 177         int i;
 178
 179         for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
 180                 quirk = &edid_quirk_list[i];
 181
 182                 if (edid_vendor(edid, quirk->vendor) &&
 183                     (EDID_PRODUCT_ID(edid) == quirk->product_id))
 184                         return quirk->quirks;
 185         }
 186
 187         return 0;
 188 }
 189
 190 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
 191 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
 192
 193
 194 /**
 195  * edid_fixup_preferred - set preferred modes based on quirk list
 196  * @connector: has mode list to fix up
 197  * @quirks: quirks list
 198  *
 199  * Walk the mode list for @connector, clearing the preferred status
 200  * on existing modes and setting it anew for the right mode ala @quirks.
 201  */
 202 static void edid_fixup_preferred(struct drm_connector *connector,
 203                                  u32 quirks)
 204 {
 205         struct drm_display_mode *t, *cur_mode, *preferred_mode;
 206         int target_refresh = 0;
 207
 208         if (list_empty(&connector->probed_modes))
 209                 return;
 210
 211         if (quirks & EDID_QUIRK_PREFER_LARGE_60)
 212                 target_refresh = 60;
 213         if (quirks & EDID_QUIRK_PREFER_LARGE_75)
 214                 target_refresh = 75;
 215
 216         preferred_mode = list_first_entry(&connector->probed_modes,
 217                                           struct drm_display_mode, head);
 218
 219         list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
 220                 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
 221
 222                 if (cur_mode == preferred_mode)
 223                         continue;
 224
 225                 /* Largest mode is preferred */
 226                 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
 227                         preferred_mode = cur_mode;
 228
 229                 /* At a given size, try to get closest to target refresh */
 230                 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
 231                     MODE_REFRESH_DIFF(cur_mode, target_refresh) <
 232                     MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
 233                         preferred_mode = cur_mode;
 234                 }
 235         }
 236
 237         preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
 238 }
 239
 240 /**
 241  * drm_mode_std - convert standard mode info (width, height, refresh) into mode
 242  * @t: standard timing params
 243  *
 244  * Take the standard timing params (in this case width, aspect, and refresh)
 245  * and convert them into a real mode using CVT.
 246  *
 247  * Punts for now, but should eventually use the FB layer's CVT based mode
 248  * generation code.
 249  */
 250 struct drm_display_mode *drm_mode_std(struct drm_device *dev,
 251                                       struct std_timing *t)
 252 {
 253         struct drm_display_mode *mode;
 254         int hsize = t->hsize * 8 + 248, vsize;
 255         unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
 256                 >> EDID_TIMING_ASPECT_SHIFT;
 257
 258         mode = drm_mode_create(dev);
 259         if (!mode)
 260                 return NULL;
 261
 262         if (aspect_ratio == 0)
 263                 vsize = (hsize * 10) / 16;
 264         else if (aspect_ratio == 1)
 265                 vsize = (hsize * 3) / 4;
 266         else if (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         unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
 294         unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
 295         unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
 296         unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
 297         unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
 298         unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
 299         unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
 300         unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
 301
 302         /* ignore tiny modes */
 303         if (hactive < 64 || vactive < 64)
 304                 return NULL;
 305
 306         if (pt->misc & DRM_EDID_PT_STEREO) {
 307                 printk(KERN_WARNING "stereo mode not supported\n");
 308                 return NULL;
 309         }
 310         if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
 311                 printk(KERN_WARNING "integrated sync not supported\n");
 312                 return NULL;
 313         }
 314
 315         mode = drm_mode_create(dev);
 316         if (!mode)
 317                 return NULL;
 318
 319         mode->type = DRM_MODE_TYPE_DRIVER;
 320
 321         if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
 322                 timing->pixel_clock = cpu_to_le16(1088);
 323
 324         mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
 325
 326         mode->hdisplay = hactive;
 327         mode->hsync_start = mode->hdisplay + hsync_offset;
 328         mode->hsync_end = mode->hsync_start + hsync_pulse_width;
 329         mode->htotal = mode->hdisplay + hblank;
 330
 331         mode->vdisplay = vactive;
 332         mode->vsync_start = mode->vdisplay + vsync_offset;
 333         mode->vsync_end = mode->vsync_start + vsync_pulse_width;
 334         mode->vtotal = mode->vdisplay + vblank;
 335
 336         drm_mode_set_name(mode);
 337
 338         if (pt->misc & DRM_EDID_PT_INTERLACED)
 339                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
 340
 341         if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
 342                 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
 343         }
 344
 345         mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
 346                 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
 347         mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
 348                 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
 349
 350         mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
 351         mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
 352
 353         if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
 354                 mode->width_mm *= 10;
 355                 mode->height_mm *= 10;
 356         }
 357
 358         if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
 359                 mode->width_mm = edid->width_cm * 10;
 360                 mode->height_mm = edid->height_cm * 10;
 361         }
 362
 363         return mode;
 364 }
 365
 366 /*
 367  * Detailed mode info for the EDID "established modes" data to use.
 368  */
 369 static struct drm_display_mode edid_est_modes[] = {
 370         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
 371                    968, 1056, 0, 600, 601, 605, 628, 0,
 372                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */
 373         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824,
 374                    896, 1024, 0, 600, 601, 603,  625, 0,
 375                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */
 376         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656,
 377                    720, 840, 0, 480, 481, 484, 500, 0,
 378                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */
 379         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664,
 380                    704,  832, 0, 480, 489, 491, 520, 0,
 381                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */
 382         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704,
 383                    768,  864, 0, 480, 483, 486, 525, 0,
 384                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */
 385         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656,
 386                    752, 800, 0, 480, 490, 492, 525, 0,
 387                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */
 388         { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738,
 389                    846, 900, 0, 400, 421, 423,  449, 0,
 390                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */
 391         { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738,
 392                    846,  900, 0, 400, 412, 414, 449, 0,
 393                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */
 394         { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296,
 395                    1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
 396                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */
 397         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040,
 398                    1136, 1312, 0,  768, 769, 772, 800, 0,
 399                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */
 400         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048,
 401                    1184, 1328, 0,  768, 771, 777, 806, 0,
 402                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */
 403         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
 404                    1184, 1344, 0,  768, 771, 777, 806, 0,
 405                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */
 406         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032,
 407                    1208, 1264, 0, 768, 768, 776, 817, 0,
 408                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */
 409         { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864,
 410                    928, 1152, 0, 624, 625, 628, 667, 0,
 411                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */
 412         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816,
 413                    896, 1056, 0, 600, 601, 604,  625, 0,
 414                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */
 415         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856,
 416                    976, 1040, 0, 600, 637, 643, 666, 0,
 417                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */
 418         { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,
 419                    1344, 1600, 0,  864, 865, 868, 900, 0,
 420                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */
 421 };
 422
 423 #define EDID_EST_TIMINGS 16
 424 #define EDID_STD_TIMINGS 8
 425 #define EDID_DETAILED_TIMINGS 4
 426
 427 /**
 428  * add_established_modes - get est. modes from EDID and add them
 429  * @edid: EDID block to scan
 430  *
 431  * Each EDID block contains a bitmap of the supported "established modes" list
 432  * (defined above).  Tease them out and add them to the global modes list.
 433  */
 434 static int add_established_modes(struct drm_connector *connector, struct edid *edid)
 435 {
 436         struct drm_device *dev = connector->dev;
 437         unsigned long est_bits = edid->established_timings.t1 |
 438                 (edid->established_timings.t2 << 8) |
 439                 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
 440         int i, modes = 0;
 441
 442         for (i = 0; i <= EDID_EST_TIMINGS; i++)
 443                 if (est_bits & (1<<i)) {
 444                         struct drm_display_mode *newmode;
 445                         newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
 446                         if (newmode) {
 447                                 drm_mode_probed_add(connector, newmode);
 448                                 modes++;
 449                         }
 450                 }
 451
 452         return modes;
 453 }
 454
 455 /**
 456  * add_standard_modes - get std. modes from EDID and add them
 457  * @edid: EDID block to scan
 458  *
 459  * Standard modes can be calculated using the CVT standard.  Grab them from
 460  * @edid, calculate them, and add them to the list.
 461  */
 462 static int add_standard_modes(struct drm_connector *connector, struct edid *edid)
 463 {
 464         struct drm_device *dev = connector->dev;
 465         int i, modes = 0;
 466
 467         for (i = 0; i < EDID_STD_TIMINGS; i++) {
 468                 struct std_timing *t = &edid->standard_timings[i];
 469                 struct drm_display_mode *newmode;
 470
 471                 /* If std timings bytes are 1, 1 it's empty */
 472                 if (t->hsize == 1 && t->vfreq_aspect == 1)
 473                         continue;
 474
 475                 newmode = drm_mode_std(dev, &edid->standard_timings[i]);
 476                 if (newmode) {
 477                         drm_mode_probed_add(connector, newmode);
 478                         modes++;
 479                 }
 480         }
 481
 482         return modes;
 483 }
 484
 485 /**
 486  * add_detailed_modes - get detailed mode info from EDID data
 487  * @connector: attached connector
 488  * @edid: EDID block to scan
 489  * @quirks: quirks to apply
 490  *
 491  * Some of the detailed timing sections may contain mode information.  Grab
 492  * it and add it to the list.
 493  */
 494 static int add_detailed_info(struct drm_connector *connector,
 495                              struct edid *edid, u32 quirks)
 496 {
 497         struct drm_device *dev = connector->dev;
 498         int i, j, modes = 0;
 499
 500         for (i = 0; i < EDID_DETAILED_TIMINGS; i++) {
 501                 struct detailed_timing *timing = &edid->detailed_timings[i];
 502                 struct detailed_non_pixel *data = &timing->data.other_data;
 503                 struct drm_display_mode *newmode;
 504
 505                 /* EDID up to and including 1.2 may put monitor info here */
 506                 if (edid->version == 1 && edid->revision < 3)
 507                         continue;
 508
 509                 /* Detailed mode timing */
 510                 if (timing->pixel_clock) {
 511                         newmode = drm_mode_detailed(dev, edid, timing, quirks);
 512                         if (!newmode)
 513                                 continue;
 514
 515                         /* First detailed mode is preferred */
 516                         if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING))
 517                                 newmode->type |= DRM_MODE_TYPE_PREFERRED;
 518                         drm_mode_probed_add(connector, newmode);
 519
 520                         modes++;
 521                         continue;
 522                 }
 523
 524                 /* Other timing or info */
 525                 switch (data->type) {
 526                 case EDID_DETAIL_MONITOR_SERIAL:
 527                         break;
 528                 case EDID_DETAIL_MONITOR_STRING:
 529                         break;
 530                 case EDID_DETAIL_MONITOR_RANGE:
 531                         /* Get monitor range data */
 532                         break;
 533                 case EDID_DETAIL_MONITOR_NAME:
 534                         break;
 535                 case EDID_DETAIL_MONITOR_CPDATA:
 536                         break;
 537                 case EDID_DETAIL_STD_MODES:
 538                         /* Five modes per detailed section */
 539                         for (j = 0; j < 5; i++) {
 540                                 struct std_timing *std;
 541                                 struct drm_display_mode *newmode;
 542
 543                                 std = &data->data.timings[j];
 544                                 newmode = drm_mode_std(dev, std);
 545                                 if (newmode) {
 546                                         drm_mode_probed_add(connector, newmode);
 547                                         modes++;
 548                                 }
 549                         }
 550                         break;
 551                 default:
 552                         break;
 553                 }
 554         }
 555
 556         return modes;
 557 }
 558
 559 #define DDC_ADDR 0x50
 560 /**
 561  * Get EDID information via I2C.
 562  *
 563  * \param adapter : i2c device adaptor
 564  * \param buf     : EDID data buffer to be filled
 565  * \param len     : EDID data buffer length
 566  * \return 0 on success or -1 on failure.
 567  *
 568  * Try to fetch EDID information by calling i2c driver function.
 569  */
 570 int drm_do_probe_ddc_edid(struct i2c_adapter *adapter,
 571                           unsigned char *buf, int len)
 572 {
 573         unsigned char start = 0x0;
 574         struct i2c_msg msgs[] = {
 575                 {
 576                         .addr   = DDC_ADDR,
 577                         .flags  = 0,
 578                         .len    = 1,
 579                         .buf    = &start,
 580                 }, {
 581                         .addr   = DDC_ADDR,
 582                         .flags  = I2C_M_RD,
 583                         .len    = len,
 584                         .buf    = buf,
 585                 }
 586         };
 587
 588         if (i2c_transfer(adapter, msgs, 2) == 2)
 589                 return 0;
 590
 591         dev_info(&adapter->dev, "unable to read EDID block.\n");
 592         return -1;
 593 }
 594 EXPORT_SYMBOL(drm_do_probe_ddc_edid);
 595
 596 static int drm_ddc_read_edid(struct drm_connector *connector,
 597                              struct i2c_adapter *adapter,
 598                              char *buf, int len)
 599 {
 600         int ret;
 601
 602         ret = drm_do_probe_ddc_edid(adapter, buf, len);
 603         if (ret != 0) {
 604                 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n",
 605                          drm_get_connector_name(connector));
 606                 goto end;
 607         }
 608         if (!edid_is_valid((struct edid *)buf)) {
 609                 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
 610                          drm_get_connector_name(connector));
 611                 ret = -1;
 612         }
 613 end:
 614         return ret;
 615 }
 616
 617 #define MAX_EDID_EXT_NUM 4
 618 /**
 619  * drm_get_edid - get EDID data, if available
 620  * @connector: connector we're probing
 621  * @adapter: i2c adapter to use for DDC
 622  *
 623  * Poke the given connector's i2c channel to grab EDID data if possible.
 624  *
 625  * Return edid data or NULL if we couldn't find any.
 626  */
 627 struct edid *drm_get_edid(struct drm_connector *connector,
 628                           struct i2c_adapter *adapter)
 629 {
 630         int ret;
 631         struct edid *edid;
 632
 633         edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1),
 634                        GFP_KERNEL);
 635         if (edid == NULL) {
 636                 dev_warn(&connector->dev->pdev->dev,
 637                          "Failed to allocate EDID\n");
 638                 goto end;
 639         }
 640
 641         /* Read first EDID block */
 642         ret = drm_ddc_read_edid(connector, adapter,
 643                                 (unsigned char *)edid, EDID_LENGTH);
 644         if (ret != 0)
 645                 goto clean_up;
 646
 647         /* There are EDID extensions to be read */
 648         if (edid->extensions != 0) {
 649                 int edid_ext_num = edid->extensions;
 650
 651                 if (edid_ext_num > MAX_EDID_EXT_NUM) {
 652                         dev_warn(&connector->dev->pdev->dev,
 653                                  "The number of extension(%d) is "
 654                                  "over max (%d), actually read number (%d)\n",
 655                                  edid_ext_num, MAX_EDID_EXT_NUM,
 656                                  MAX_EDID_EXT_NUM);
 657                         /* Reset EDID extension number to be read */
 658                         edid_ext_num = MAX_EDID_EXT_NUM;
 659                 }
 660                 /* Read EDID including extensions too */
 661                 ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
 662                                         EDID_LENGTH * (edid_ext_num + 1));
 663                 if (ret != 0)
 664                         goto clean_up;
 665
 666         }
 667
 668         connector->display_info.raw_edid = (char *)edid;
 669         goto end;
 670
 671 clean_up:
 672         kfree(edid);
 673         edid = NULL;
 674 end:
 675         return edid;
 676
 677 }
 678 EXPORT_SYMBOL(drm_get_edid);
 679
 680 #define HDMI_IDENTIFIER 0x000C03
 681 #define VENDOR_BLOCK    0x03
 682 /**
 683  * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
 684  * @edid: monitor EDID information
 685  *
 686  * Parse the CEA extension according to CEA-861-B.
 687  * Return true if HDMI, false if not or unknown.
 688  */
 689 bool drm_detect_hdmi_monitor(struct edid *edid)
 690 {
 691         char *edid_ext = NULL;
 692         int i, hdmi_id, edid_ext_num;
 693         int start_offset, end_offset;
 694         bool is_hdmi = false;
 695
 696         /* No EDID or EDID extensions */
 697         if (edid == NULL || edid->extensions == 0)
 698                 goto end;
 699
 700         /* Chose real EDID extension number */
 701         edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?
 702                        MAX_EDID_EXT_NUM : edid->extensions;
 703
 704         /* Find CEA extension */
 705         for (i = 0; i < edid_ext_num; i++) {
 706                 edid_ext = (char *)edid + EDID_LENGTH * (i + 1);
 707                 /* This block is CEA extension */
 708                 if (edid_ext[0] == 0x02)
 709                         break;
 710         }
 711
 712         if (i == edid_ext_num)
 713                 goto end;
 714
 715         /* Data block offset in CEA extension block */
 716         start_offset = 4;
 717         end_offset = edid_ext[2];
 718
 719         /*
 720          * Because HDMI identifier is in Vendor Specific Block,
 721          * search it from all data blocks of CEA extension.
 722          */
 723         for (i = start_offset; i < end_offset;
 724                 /* Increased by data block len */
 725                 i += ((edid_ext[i] & 0x1f) + 1)) {
 726                 /* Find vendor specific block */
 727                 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
 728                         hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
 729                                   edid_ext[i + 3] << 16;
 730                         /* Find HDMI identifier */
 731                         if (hdmi_id == HDMI_IDENTIFIER)
 732                                 is_hdmi = true;
 733                         break;
 734                 }
 735         }
 736
 737 end:
 738         return is_hdmi;
 739 }
 740 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
 741
 742 /**
 743  * drm_add_edid_modes - add modes from EDID data, if available
 744  * @connector: connector we're probing
 745  * @edid: edid data
 746  *
 747  * Add the specified modes to the connector's mode list.
 748  *
 749  * Return number of modes added or 0 if we couldn't find any.
 750  */
 751 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
 752 {
 753         int num_modes = 0;
 754         u32 quirks;
 755
 756         if (edid == NULL) {
 757                 return 0;
 758         }
 759         if (!edid_is_valid(edid)) {
 760                 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
 761                          drm_get_connector_name(connector));
 762                 return 0;
 763         }
 764
 765         quirks = edid_get_quirks(edid);
 766
 767         num_modes += add_established_modes(connector, edid);
 768         num_modes += add_standard_modes(connector, edid);
 769         num_modes += add_detailed_info(connector, edid, quirks);
 770
 771         if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
 772                 edid_fixup_preferred(connector, quirks);
 773
 774         connector->display_info.serration_vsync = (edid->input & DRM_EDID_INPUT_SERRATION_VSYNC) ? 1 : 0;
 775         connector->display_info.sync_on_green = (edid->input & DRM_EDID_INPUT_SYNC_ON_GREEN) ? 1 : 0;
 776         connector->display_info.composite_sync = (edid->input & DRM_EDID_INPUT_COMPOSITE_SYNC) ? 1 : 0;
 777         connector->display_info.separate_syncs = (edid->input & DRM_EDID_INPUT_SEPARATE_SYNCS) ? 1 : 0;
 778         connector->display_info.blank_to_black = (edid->input & DRM_EDID_INPUT_BLANK_TO_BLACK) ? 1 : 0;
 779         connector->display_info.video_level = (edid->input & DRM_EDID_INPUT_VIDEO_LEVEL) >> 5;
 780         connector->display_info.digital = (edid->input & DRM_EDID_INPUT_DIGITAL) ? 1 : 0;
 781         connector->display_info.width_mm = edid->width_cm * 10;
 782         connector->display_info.height_mm = edid->height_cm * 10;
 783         connector->display_info.gamma = edid->gamma;
 784         connector->display_info.gtf_supported = (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF) ? 1 : 0;
 785         connector->display_info.standard_color = (edid->features & DRM_EDID_FEATURE_STANDARD_COLOR) ? 1 : 0;
 786         connector->display_info.display_type = (edid->features & DRM_EDID_FEATURE_DISPLAY_TYPE) >> 3;
 787         connector->display_info.active_off_supported = (edid->features & DRM_EDID_FEATURE_PM_ACTIVE_OFF) ? 1 : 0;
 788         connector->display_info.suspend_supported = (edid->features & DRM_EDID_FEATURE_PM_SUSPEND) ? 1 : 0;
 789         connector->display_info.standby_supported = (edid->features & DRM_EDID_FEATURE_PM_STANDBY) ? 1 : 0;
 790         connector->display_info.gamma = edid->gamma;
 791
 792         return num_modes;
 793 }
 794 EXPORT_SYMBOL(drm_add_edid_modes);