linux/drivers/gpu/drm/drm_edid.c
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   1/*
   2 * Copyright (c) 2006 Luc Verhaegen (quirks list)
   3 * Copyright (c) 2007-2008 Intel Corporation
   4 *   Jesse Barnes <jesse.barnes@intel.com>
   5 * Copyright 2010 Red Hat, Inc.
   6 *
   7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
   8 * FB layer.
   9 *   Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
  10 *
  11 * Permission is hereby granted, free of charge, to any person obtaining a
  12 * copy of this software and associated documentation files (the "Software"),
  13 * to deal in the Software without restriction, including without limitation
  14 * the rights to use, copy, modify, merge, publish, distribute, sub license,
  15 * and/or sell copies of the Software, and to permit persons to whom the
  16 * Software is furnished to do so, subject to the following conditions:
  17 *
  18 * The above copyright notice and this permission notice (including the
  19 * next paragraph) shall be included in all copies or substantial portions
  20 * of the Software.
  21 *
  22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  28 * DEALINGS IN THE SOFTWARE.
  29 */
  30#include <linux/kernel.h>
  31#include <linux/slab.h>
  32#include <linux/i2c.h>
  33#include <linux/export.h>
  34#include "drmP.h"
  35#include "drm_edid.h"
  36#include "drm_edid_modes.h"
  37
  38#define version_greater(edid, maj, min) \
  39        (((edid)->version > (maj)) || \
  40         ((edid)->version == (maj) && (edid)->revision > (min)))
  41
  42#define EDID_EST_TIMINGS 16
  43#define EDID_STD_TIMINGS 8
  44#define EDID_DETAILED_TIMINGS 4
  45
  46/*
  47 * EDID blocks out in the wild have a variety of bugs, try to collect
  48 * them here (note that userspace may work around broken monitors first,
  49 * but fixes should make their way here so that the kernel "just works"
  50 * on as many displays as possible).
  51 */
  52
  53/* First detailed mode wrong, use largest 60Hz mode */
  54#define EDID_QUIRK_PREFER_LARGE_60              (1 << 0)
  55/* Reported 135MHz pixel clock is too high, needs adjustment */
  56#define EDID_QUIRK_135_CLOCK_TOO_HIGH           (1 << 1)
  57/* Prefer the largest mode at 75 Hz */
  58#define EDID_QUIRK_PREFER_LARGE_75              (1 << 2)
  59/* Detail timing is in cm not mm */
  60#define EDID_QUIRK_DETAILED_IN_CM               (1 << 3)
  61/* Detailed timing descriptors have bogus size values, so just take the
  62 * maximum size and use that.
  63 */
  64#define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE    (1 << 4)
  65/* Monitor forgot to set the first detailed is preferred bit. */
  66#define EDID_QUIRK_FIRST_DETAILED_PREFERRED     (1 << 5)
  67/* use +hsync +vsync for detailed mode */
  68#define EDID_QUIRK_DETAILED_SYNC_PP             (1 << 6)
  69
  70struct detailed_mode_closure {
  71        struct drm_connector *connector;
  72        struct edid *edid;
  73        bool preferred;
  74        u32 quirks;
  75        int modes;
  76};
  77
  78#define LEVEL_DMT       0
  79#define LEVEL_GTF       1
  80#define LEVEL_GTF2      2
  81#define LEVEL_CVT       3
  82
  83static struct edid_quirk {
  84        char *vendor;
  85        int product_id;
  86        u32 quirks;
  87} edid_quirk_list[] = {
  88        /* Acer AL1706 */
  89        { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
  90        /* Acer F51 */
  91        { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
  92        /* Unknown Acer */
  93        { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  94
  95        /* Belinea 10 15 55 */
  96        { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
  97        { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
  98
  99        /* Envision Peripherals, Inc. EN-7100e */
 100        { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
 101        /* Envision EN2028 */
 102        { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
 103
 104        /* Funai Electronics PM36B */
 105        { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
 106          EDID_QUIRK_DETAILED_IN_CM },
 107
 108        /* LG Philips LCD LP154W01-A5 */
 109        { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
 110        { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
 111
 112        /* Philips 107p5 CRT */
 113        { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
 114
 115        /* Proview AY765C */
 116        { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
 117
 118        /* Samsung SyncMaster 205BW.  Note: irony */
 119        { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
 120        /* Samsung SyncMaster 22[5-6]BW */
 121        { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
 122        { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
 123};
 124
 125/*** DDC fetch and block validation ***/
 126
 127static const u8 edid_header[] = {
 128        0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
 129};
 130
 131 /*
 132 * Sanity check the header of the base EDID block.  Return 8 if the header
 133 * is perfect, down to 0 if it's totally wrong.
 134 */
 135int drm_edid_header_is_valid(const u8 *raw_edid)
 136{
 137        int i, score = 0;
 138
 139        for (i = 0; i < sizeof(edid_header); i++)
 140                if (raw_edid[i] == edid_header[i])
 141                        score++;
 142
 143        return score;
 144}
 145EXPORT_SYMBOL(drm_edid_header_is_valid);
 146
 147
 148/*
 149 * Sanity check the EDID block (base or extension).  Return 0 if the block
 150 * doesn't check out, or 1 if it's valid.
 151 */
 152static bool
 153drm_edid_block_valid(u8 *raw_edid)
 154{
 155        int i;
 156        u8 csum = 0;
 157        struct edid *edid = (struct edid *)raw_edid;
 158
 159        if (raw_edid[0] == 0x00) {
 160                int score = drm_edid_header_is_valid(raw_edid);
 161                if (score == 8) ;
 162                else if (score >= 6) {
 163                        DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
 164                        memcpy(raw_edid, edid_header, sizeof(edid_header));
 165                } else {
 166                        goto bad;
 167                }
 168        }
 169
 170        for (i = 0; i < EDID_LENGTH; i++)
 171                csum += raw_edid[i];
 172        if (csum) {
 173                DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
 174
 175                /* allow CEA to slide through, switches mangle this */
 176                if (raw_edid[0] != 0x02)
 177                        goto bad;
 178        }
 179
 180        /* per-block-type checks */
 181        switch (raw_edid[0]) {
 182        case 0: /* base */
 183                if (edid->version != 1) {
 184                        DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
 185                        goto bad;
 186                }
 187
 188                if (edid->revision > 4)
 189                        DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
 190                break;
 191
 192        default:
 193                break;
 194        }
 195
 196        return 1;
 197
 198bad:
 199        if (raw_edid) {
 200                printk(KERN_ERR "Raw EDID:\n");
 201                print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
 202                               raw_edid, EDID_LENGTH, false);
 203        }
 204        return 0;
 205}
 206
 207/**
 208 * drm_edid_is_valid - sanity check EDID data
 209 * @edid: EDID data
 210 *
 211 * Sanity-check an entire EDID record (including extensions)
 212 */
 213bool drm_edid_is_valid(struct edid *edid)
 214{
 215        int i;
 216        u8 *raw = (u8 *)edid;
 217
 218        if (!edid)
 219                return false;
 220
 221        for (i = 0; i <= edid->extensions; i++)
 222                if (!drm_edid_block_valid(raw + i * EDID_LENGTH))
 223                        return false;
 224
 225        return true;
 226}
 227EXPORT_SYMBOL(drm_edid_is_valid);
 228
 229#define DDC_ADDR 0x50
 230#define DDC_SEGMENT_ADDR 0x30
 231/**
 232 * Get EDID information via I2C.
 233 *
 234 * \param adapter : i2c device adaptor
 235 * \param buf     : EDID data buffer to be filled
 236 * \param len     : EDID data buffer length
 237 * \return 0 on success or -1 on failure.
 238 *
 239 * Try to fetch EDID information by calling i2c driver function.
 240 */
 241static int
 242drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
 243                      int block, int len)
 244{
 245        unsigned char start = block * EDID_LENGTH;
 246        int ret, retries = 5;
 247
 248        /* The core i2c driver will automatically retry the transfer if the
 249         * adapter reports EAGAIN. However, we find that bit-banging transfers
 250         * are susceptible to errors under a heavily loaded machine and
 251         * generate spurious NAKs and timeouts. Retrying the transfer
 252         * of the individual block a few times seems to overcome this.
 253         */
 254        do {
 255                struct i2c_msg msgs[] = {
 256                        {
 257                                .addr   = DDC_ADDR,
 258                                .flags  = 0,
 259                                .len    = 1,
 260                                .buf    = &start,
 261                        }, {
 262                                .addr   = DDC_ADDR,
 263                                .flags  = I2C_M_RD,
 264                                .len    = len,
 265                                .buf    = buf,
 266                        }
 267                };
 268                ret = i2c_transfer(adapter, msgs, 2);
 269        } while (ret != 2 && --retries);
 270
 271        return ret == 2 ? 0 : -1;
 272}
 273
 274static bool drm_edid_is_zero(u8 *in_edid, int length)
 275{
 276        int i;
 277        u32 *raw_edid = (u32 *)in_edid;
 278
 279        for (i = 0; i < length / 4; i++)
 280                if (*(raw_edid + i) != 0)
 281                        return false;
 282        return true;
 283}
 284
 285static u8 *
 286drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
 287{
 288        int i, j = 0, valid_extensions = 0;
 289        u8 *block, *new;
 290
 291        if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
 292                return NULL;
 293
 294        /* base block fetch */
 295        for (i = 0; i < 4; i++) {
 296                if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
 297                        goto out;
 298                if (drm_edid_block_valid(block))
 299                        break;
 300                if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
 301                        connector->null_edid_counter++;
 302                        goto carp;
 303                }
 304        }
 305        if (i == 4)
 306                goto carp;
 307
 308        /* if there's no extensions, we're done */
 309        if (block[0x7e] == 0)
 310                return block;
 311
 312        new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
 313        if (!new)
 314                goto out;
 315        block = new;
 316
 317        for (j = 1; j <= block[0x7e]; j++) {
 318                for (i = 0; i < 4; i++) {
 319                        if (drm_do_probe_ddc_edid(adapter,
 320                                  block + (valid_extensions + 1) * EDID_LENGTH,
 321                                  j, EDID_LENGTH))
 322                                goto out;
 323                        if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) {
 324                                valid_extensions++;
 325                                break;
 326                        }
 327                }
 328                if (i == 4)
 329                        dev_warn(connector->dev->dev,
 330                         "%s: Ignoring invalid EDID block %d.\n",
 331                         drm_get_connector_name(connector), j);
 332        }
 333
 334        if (valid_extensions != block[0x7e]) {
 335                block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
 336                block[0x7e] = valid_extensions;
 337                new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
 338                if (!new)
 339                        goto out;
 340                block = new;
 341        }
 342
 343        return block;
 344
 345carp:
 346        dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
 347                 drm_get_connector_name(connector), j);
 348
 349out:
 350        kfree(block);
 351        return NULL;
 352}
 353
 354/**
 355 * Probe DDC presence.
 356 *
 357 * \param adapter : i2c device adaptor
 358 * \return 1 on success
 359 */
 360static bool
 361drm_probe_ddc(struct i2c_adapter *adapter)
 362{
 363        unsigned char out;
 364
 365        return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
 366}
 367
 368/**
 369 * drm_get_edid - get EDID data, if available
 370 * @connector: connector we're probing
 371 * @adapter: i2c adapter to use for DDC
 372 *
 373 * Poke the given i2c channel to grab EDID data if possible.  If found,
 374 * attach it to the connector.
 375 *
 376 * Return edid data or NULL if we couldn't find any.
 377 */
 378struct edid *drm_get_edid(struct drm_connector *connector,
 379                          struct i2c_adapter *adapter)
 380{
 381        struct edid *edid = NULL;
 382
 383        if (drm_probe_ddc(adapter))
 384                edid = (struct edid *)drm_do_get_edid(connector, adapter);
 385
 386        connector->display_info.raw_edid = (char *)edid;
 387
 388        return edid;
 389
 390}
 391EXPORT_SYMBOL(drm_get_edid);
 392
 393/*** EDID parsing ***/
 394
 395/**
 396 * edid_vendor - match a string against EDID's obfuscated vendor field
 397 * @edid: EDID to match
 398 * @vendor: vendor string
 399 *
 400 * Returns true if @vendor is in @edid, false otherwise
 401 */
 402static bool edid_vendor(struct edid *edid, char *vendor)
 403{
 404        char edid_vendor[3];
 405
 406        edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
 407        edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
 408                          ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
 409        edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
 410
 411        return !strncmp(edid_vendor, vendor, 3);
 412}
 413
 414/**
 415 * edid_get_quirks - return quirk flags for a given EDID
 416 * @edid: EDID to process
 417 *
 418 * This tells subsequent routines what fixes they need to apply.
 419 */
 420static u32 edid_get_quirks(struct edid *edid)
 421{
 422        struct edid_quirk *quirk;
 423        int i;
 424
 425        for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
 426                quirk = &edid_quirk_list[i];
 427
 428                if (edid_vendor(edid, quirk->vendor) &&
 429                    (EDID_PRODUCT_ID(edid) == quirk->product_id))
 430                        return quirk->quirks;
 431        }
 432
 433        return 0;
 434}
 435
 436#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
 437#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
 438
 439/**
 440 * edid_fixup_preferred - set preferred modes based on quirk list
 441 * @connector: has mode list to fix up
 442 * @quirks: quirks list
 443 *
 444 * Walk the mode list for @connector, clearing the preferred status
 445 * on existing modes and setting it anew for the right mode ala @quirks.
 446 */
 447static void edid_fixup_preferred(struct drm_connector *connector,
 448                                 u32 quirks)
 449{
 450        struct drm_display_mode *t, *cur_mode, *preferred_mode;
 451        int target_refresh = 0;
 452
 453        if (list_empty(&connector->probed_modes))
 454                return;
 455
 456        if (quirks & EDID_QUIRK_PREFER_LARGE_60)
 457                target_refresh = 60;
 458        if (quirks & EDID_QUIRK_PREFER_LARGE_75)
 459                target_refresh = 75;
 460
 461        preferred_mode = list_first_entry(&connector->probed_modes,
 462                                          struct drm_display_mode, head);
 463
 464        list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
 465                cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
 466
 467                if (cur_mode == preferred_mode)
 468                        continue;
 469
 470                /* Largest mode is preferred */
 471                if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
 472                        preferred_mode = cur_mode;
 473
 474                /* At a given size, try to get closest to target refresh */
 475                if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
 476                    MODE_REFRESH_DIFF(cur_mode, target_refresh) <
 477                    MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
 478                        preferred_mode = cur_mode;
 479                }
 480        }
 481
 482        preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
 483}
 484
 485struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
 486                                           int hsize, int vsize, int fresh)
 487{
 488        struct drm_display_mode *mode = NULL;
 489        int i;
 490
 491        for (i = 0; i < drm_num_dmt_modes; i++) {
 492                const struct drm_display_mode *ptr = &drm_dmt_modes[i];
 493                if (hsize == ptr->hdisplay &&
 494                        vsize == ptr->vdisplay &&
 495                        fresh == drm_mode_vrefresh(ptr)) {
 496                        /* get the expected default mode */
 497                        mode = drm_mode_duplicate(dev, ptr);
 498                        break;
 499                }
 500        }
 501        return mode;
 502}
 503EXPORT_SYMBOL(drm_mode_find_dmt);
 504
 505typedef void detailed_cb(struct detailed_timing *timing, void *closure);
 506
 507static void
 508cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
 509{
 510        int i, n = 0;
 511        u8 d = ext[0x02];
 512        u8 *det_base = ext + d;
 513
 514        n = (127 - d) / 18;
 515        for (i = 0; i < n; i++)
 516                cb((struct detailed_timing *)(det_base + 18 * i), closure);
 517}
 518
 519static void
 520vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
 521{
 522        unsigned int i, n = min((int)ext[0x02], 6);
 523        u8 *det_base = ext + 5;
 524
 525        if (ext[0x01] != 1)
 526                return; /* unknown version */
 527
 528        for (i = 0; i < n; i++)
 529                cb((struct detailed_timing *)(det_base + 18 * i), closure);
 530}
 531
 532static void
 533drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
 534{
 535        int i;
 536        struct edid *edid = (struct edid *)raw_edid;
 537
 538        if (edid == NULL)
 539                return;
 540
 541        for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
 542                cb(&(edid->detailed_timings[i]), closure);
 543
 544        for (i = 1; i <= raw_edid[0x7e]; i++) {
 545                u8 *ext = raw_edid + (i * EDID_LENGTH);
 546                switch (*ext) {
 547                case CEA_EXT:
 548                        cea_for_each_detailed_block(ext, cb, closure);
 549                        break;
 550                case VTB_EXT:
 551                        vtb_for_each_detailed_block(ext, cb, closure);
 552                        break;
 553                default:
 554                        break;
 555                }
 556        }
 557}
 558
 559static void
 560is_rb(struct detailed_timing *t, void *data)
 561{
 562        u8 *r = (u8 *)t;
 563        if (r[3] == EDID_DETAIL_MONITOR_RANGE)
 564                if (r[15] & 0x10)
 565                        *(bool *)data = true;
 566}
 567
 568/* EDID 1.4 defines this explicitly.  For EDID 1.3, we guess, badly. */
 569static bool
 570drm_monitor_supports_rb(struct edid *edid)
 571{
 572        if (edid->revision >= 4) {
 573                bool ret;
 574                drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
 575                return ret;
 576        }
 577
 578        return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
 579}
 580
 581static void
 582find_gtf2(struct detailed_timing *t, void *data)
 583{
 584        u8 *r = (u8 *)t;
 585        if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
 586                *(u8 **)data = r;
 587}
 588
 589/* Secondary GTF curve kicks in above some break frequency */
 590static int
 591drm_gtf2_hbreak(struct edid *edid)
 592{
 593        u8 *r = NULL;
 594        drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 595        return r ? (r[12] * 2) : 0;
 596}
 597
 598static int
 599drm_gtf2_2c(struct edid *edid)
 600{
 601        u8 *r = NULL;
 602        drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 603        return r ? r[13] : 0;
 604}
 605
 606static int
 607drm_gtf2_m(struct edid *edid)
 608{
 609        u8 *r = NULL;
 610        drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 611        return r ? (r[15] << 8) + r[14] : 0;
 612}
 613
 614static int
 615drm_gtf2_k(struct edid *edid)
 616{
 617        u8 *r = NULL;
 618        drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 619        return r ? r[16] : 0;
 620}
 621
 622static int
 623drm_gtf2_2j(struct edid *edid)
 624{
 625        u8 *r = NULL;
 626        drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 627        return r ? r[17] : 0;
 628}
 629
 630/**
 631 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
 632 * @edid: EDID block to scan
 633 */
 634static int standard_timing_level(struct edid *edid)
 635{
 636        if (edid->revision >= 2) {
 637                if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
 638                        return LEVEL_CVT;
 639                if (drm_gtf2_hbreak(edid))
 640                        return LEVEL_GTF2;
 641                return LEVEL_GTF;
 642        }
 643        return LEVEL_DMT;
 644}
 645
 646/*
 647 * 0 is reserved.  The spec says 0x01 fill for unused timings.  Some old
 648 * monitors fill with ascii space (0x20) instead.
 649 */
 650static int
 651bad_std_timing(u8 a, u8 b)
 652{
 653        return (a == 0x00 && b == 0x00) ||
 654               (a == 0x01 && b == 0x01) ||
 655               (a == 0x20 && b == 0x20);
 656}
 657
 658/**
 659 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
 660 * @t: standard timing params
 661 * @timing_level: standard timing level
 662 *
 663 * Take the standard timing params (in this case width, aspect, and refresh)
 664 * and convert them into a real mode using CVT/GTF/DMT.
 665 */
 666static struct drm_display_mode *
 667drm_mode_std(struct drm_connector *connector, struct edid *edid,
 668             struct std_timing *t, int revision)
 669{
 670        struct drm_device *dev = connector->dev;
 671        struct drm_display_mode *m, *mode = NULL;
 672        int hsize, vsize;
 673        int vrefresh_rate;
 674        unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
 675                >> EDID_TIMING_ASPECT_SHIFT;
 676        unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
 677                >> EDID_TIMING_VFREQ_SHIFT;
 678        int timing_level = standard_timing_level(edid);
 679
 680        if (bad_std_timing(t->hsize, t->vfreq_aspect))
 681                return NULL;
 682
 683        /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
 684        hsize = t->hsize * 8 + 248;
 685        /* vrefresh_rate = vfreq + 60 */
 686        vrefresh_rate = vfreq + 60;
 687        /* the vdisplay is calculated based on the aspect ratio */
 688        if (aspect_ratio == 0) {
 689                if (revision < 3)
 690                        vsize = hsize;
 691                else
 692                        vsize = (hsize * 10) / 16;
 693        } else if (aspect_ratio == 1)
 694                vsize = (hsize * 3) / 4;
 695        else if (aspect_ratio == 2)
 696                vsize = (hsize * 4) / 5;
 697        else
 698                vsize = (hsize * 9) / 16;
 699
 700        /* HDTV hack, part 1 */
 701        if (vrefresh_rate == 60 &&
 702            ((hsize == 1360 && vsize == 765) ||
 703             (hsize == 1368 && vsize == 769))) {
 704                hsize = 1366;
 705                vsize = 768;
 706        }
 707
 708        /*
 709         * If this connector already has a mode for this size and refresh
 710         * rate (because it came from detailed or CVT info), use that
 711         * instead.  This way we don't have to guess at interlace or
 712         * reduced blanking.
 713         */
 714        list_for_each_entry(m, &connector->probed_modes, head)
 715                if (m->hdisplay == hsize && m->vdisplay == vsize &&
 716                    drm_mode_vrefresh(m) == vrefresh_rate)
 717                        return NULL;
 718
 719        /* HDTV hack, part 2 */
 720        if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
 721                mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
 722                                    false);
 723                mode->hdisplay = 1366;
 724                mode->hsync_start = mode->hsync_start - 1;
 725                mode->hsync_end = mode->hsync_end - 1;
 726                return mode;
 727        }
 728
 729        /* check whether it can be found in default mode table */
 730        mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate);
 731        if (mode)
 732                return mode;
 733
 734        switch (timing_level) {
 735        case LEVEL_DMT:
 736                break;
 737        case LEVEL_GTF:
 738                mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
 739                break;
 740        case LEVEL_GTF2:
 741                /*
 742                 * This is potentially wrong if there's ever a monitor with
 743                 * more than one ranges section, each claiming a different
 744                 * secondary GTF curve.  Please don't do that.
 745                 */
 746                mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
 747                if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
 748                        kfree(mode);
 749                        mode = drm_gtf_mode_complex(dev, hsize, vsize,
 750                                                    vrefresh_rate, 0, 0,
 751                                                    drm_gtf2_m(edid),
 752                                                    drm_gtf2_2c(edid),
 753                                                    drm_gtf2_k(edid),
 754                                                    drm_gtf2_2j(edid));
 755                }
 756                break;
 757        case LEVEL_CVT:
 758                mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
 759                                    false);
 760                break;
 761        }
 762        return mode;
 763}
 764
 765/*
 766 * EDID is delightfully ambiguous about how interlaced modes are to be
 767 * encoded.  Our internal representation is of frame height, but some
 768 * HDTV detailed timings are encoded as field height.
 769 *
 770 * The format list here is from CEA, in frame size.  Technically we
 771 * should be checking refresh rate too.  Whatever.
 772 */
 773static void
 774drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
 775                            struct detailed_pixel_timing *pt)
 776{
 777        int i;
 778        static const struct {
 779                int w, h;
 780        } cea_interlaced[] = {
 781                { 1920, 1080 },
 782                {  720,  480 },
 783                { 1440,  480 },
 784                { 2880,  480 },
 785                {  720,  576 },
 786                { 1440,  576 },
 787                { 2880,  576 },
 788        };
 789
 790        if (!(pt->misc & DRM_EDID_PT_INTERLACED))
 791                return;
 792
 793        for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
 794                if ((mode->hdisplay == cea_interlaced[i].w) &&
 795                    (mode->vdisplay == cea_interlaced[i].h / 2)) {
 796                        mode->vdisplay *= 2;
 797                        mode->vsync_start *= 2;
 798                        mode->vsync_end *= 2;
 799                        mode->vtotal *= 2;
 800                        mode->vtotal |= 1;
 801                }
 802        }
 803
 804        mode->flags |= DRM_MODE_FLAG_INTERLACE;
 805}
 806
 807/**
 808 * drm_mode_detailed - create a new mode from an EDID detailed timing section
 809 * @dev: DRM device (needed to create new mode)
 810 * @edid: EDID block
 811 * @timing: EDID detailed timing info
 812 * @quirks: quirks to apply
 813 *
 814 * An EDID detailed timing block contains enough info for us to create and
 815 * return a new struct drm_display_mode.
 816 */
 817static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
 818                                                  struct edid *edid,
 819                                                  struct detailed_timing *timing,
 820                                                  u32 quirks)
 821{
 822        struct drm_display_mode *mode;
 823        struct detailed_pixel_timing *pt = &timing->data.pixel_data;
 824        unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
 825        unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
 826        unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
 827        unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
 828        unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
 829        unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
 830        unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
 831        unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
 832
 833        /* ignore tiny modes */
 834        if (hactive < 64 || vactive < 64)
 835                return NULL;
 836
 837        if (pt->misc & DRM_EDID_PT_STEREO) {
 838                printk(KERN_WARNING "stereo mode not supported\n");
 839                return NULL;
 840        }
 841        if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
 842                printk(KERN_WARNING "composite sync not supported\n");
 843        }
 844
 845        /* it is incorrect if hsync/vsync width is zero */
 846        if (!hsync_pulse_width || !vsync_pulse_width) {
 847                DRM_DEBUG_KMS("Incorrect Detailed timing. "
 848                                "Wrong Hsync/Vsync pulse width\n");
 849                return NULL;
 850        }
 851        mode = drm_mode_create(dev);
 852        if (!mode)
 853                return NULL;
 854
 855        mode->type = DRM_MODE_TYPE_DRIVER;
 856
 857        if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
 858                timing->pixel_clock = cpu_to_le16(1088);
 859
 860        mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
 861
 862        mode->hdisplay = hactive;
 863        mode->hsync_start = mode->hdisplay + hsync_offset;
 864        mode->hsync_end = mode->hsync_start + hsync_pulse_width;
 865        mode->htotal = mode->hdisplay + hblank;
 866
 867        mode->vdisplay = vactive;
 868        mode->vsync_start = mode->vdisplay + vsync_offset;
 869        mode->vsync_end = mode->vsync_start + vsync_pulse_width;
 870        mode->vtotal = mode->vdisplay + vblank;
 871
 872        /* Some EDIDs have bogus h/vtotal values */
 873        if (mode->hsync_end > mode->htotal)
 874                mode->htotal = mode->hsync_end + 1;
 875        if (mode->vsync_end > mode->vtotal)
 876                mode->vtotal = mode->vsync_end + 1;
 877
 878        drm_mode_do_interlace_quirk(mode, pt);
 879
 880        drm_mode_set_name(mode);
 881
 882        if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
 883                pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
 884        }
 885
 886        mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
 887                DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
 888        mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
 889                DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
 890
 891        mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
 892        mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
 893
 894        if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
 895                mode->width_mm *= 10;
 896                mode->height_mm *= 10;
 897        }
 898
 899        if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
 900                mode->width_mm = edid->width_cm * 10;
 901                mode->height_mm = edid->height_cm * 10;
 902        }
 903
 904        return mode;
 905}
 906
 907static bool
 908mode_is_rb(const struct drm_display_mode *mode)
 909{
 910        return (mode->htotal - mode->hdisplay == 160) &&
 911               (mode->hsync_end - mode->hdisplay == 80) &&
 912               (mode->hsync_end - mode->hsync_start == 32) &&
 913               (mode->vsync_start - mode->vdisplay == 3);
 914}
 915
 916static bool
 917mode_in_hsync_range(const struct drm_display_mode *mode,
 918                    struct edid *edid, u8 *t)
 919{
 920        int hsync, hmin, hmax;
 921
 922        hmin = t[7];
 923        if (edid->revision >= 4)
 924            hmin += ((t[4] & 0x04) ? 255 : 0);
 925        hmax = t[8];
 926        if (edid->revision >= 4)
 927            hmax += ((t[4] & 0x08) ? 255 : 0);
 928        hsync = drm_mode_hsync(mode);
 929
 930        return (hsync <= hmax && hsync >= hmin);
 931}
 932
 933static bool
 934mode_in_vsync_range(const struct drm_display_mode *mode,
 935                    struct edid *edid, u8 *t)
 936{
 937        int vsync, vmin, vmax;
 938
 939        vmin = t[5];
 940        if (edid->revision >= 4)
 941            vmin += ((t[4] & 0x01) ? 255 : 0);
 942        vmax = t[6];
 943        if (edid->revision >= 4)
 944            vmax += ((t[4] & 0x02) ? 255 : 0);
 945        vsync = drm_mode_vrefresh(mode);
 946
 947        return (vsync <= vmax && vsync >= vmin);
 948}
 949
 950static u32
 951range_pixel_clock(struct edid *edid, u8 *t)
 952{
 953        /* unspecified */
 954        if (t[9] == 0 || t[9] == 255)
 955                return 0;
 956
 957        /* 1.4 with CVT support gives us real precision, yay */
 958        if (edid->revision >= 4 && t[10] == 0x04)
 959                return (t[9] * 10000) - ((t[12] >> 2) * 250);
 960
 961        /* 1.3 is pathetic, so fuzz up a bit */
 962        return t[9] * 10000 + 5001;
 963}
 964
 965static bool
 966mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
 967              struct detailed_timing *timing)
 968{
 969        u32 max_clock;
 970        u8 *t = (u8 *)timing;
 971
 972        if (!mode_in_hsync_range(mode, edid, t))
 973                return false;
 974
 975        if (!mode_in_vsync_range(mode, edid, t))
 976                return false;
 977
 978        if ((max_clock = range_pixel_clock(edid, t)))
 979                if (mode->clock > max_clock)
 980                        return false;
 981
 982        /* 1.4 max horizontal check */
 983        if (edid->revision >= 4 && t[10] == 0x04)
 984                if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
 985                        return false;
 986
 987        if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
 988                return false;
 989
 990        return true;
 991}
 992
 993/*
 994 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
 995 * need to account for them.
 996 */
 997static int
 998drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
 999                        struct detailed_timing *timing)
1000{
1001        int i, modes = 0;
1002        struct drm_display_mode *newmode;
1003        struct drm_device *dev = connector->dev;
1004
1005        for (i = 0; i < drm_num_dmt_modes; i++) {
1006                if (mode_in_range(drm_dmt_modes + i, edid, timing)) {
1007                        newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1008                        if (newmode) {
1009                                drm_mode_probed_add(connector, newmode);
1010                                modes++;
1011                        }
1012                }
1013        }
1014
1015        return modes;
1016}
1017
1018static void
1019do_inferred_modes(struct detailed_timing *timing, void *c)
1020{
1021        struct detailed_mode_closure *closure = c;
1022        struct detailed_non_pixel *data = &timing->data.other_data;
1023        int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF);
1024
1025        if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE)
1026                closure->modes += drm_gtf_modes_for_range(closure->connector,
1027                                                          closure->edid,
1028                                                          timing);
1029}
1030
1031static int
1032add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1033{
1034        struct detailed_mode_closure closure = {
1035                connector, edid, 0, 0, 0
1036        };
1037
1038        if (version_greater(edid, 1, 0))
1039                drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1040                                            &closure);
1041
1042        return closure.modes;
1043}
1044
1045static int
1046drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1047{
1048        int i, j, m, modes = 0;
1049        struct drm_display_mode *mode;
1050        u8 *est = ((u8 *)timing) + 5;
1051
1052        for (i = 0; i < 6; i++) {
1053                for (j = 7; j > 0; j--) {
1054                        m = (i * 8) + (7 - j);
1055                        if (m >= ARRAY_SIZE(est3_modes))
1056                                break;
1057                        if (est[i] & (1 << j)) {
1058                                mode = drm_mode_find_dmt(connector->dev,
1059                                                         est3_modes[m].w,
1060                                                         est3_modes[m].h,
1061                                                         est3_modes[m].r
1062                                                         /*, est3_modes[m].rb */);
1063                                if (mode) {
1064                                        drm_mode_probed_add(connector, mode);
1065                                        modes++;
1066                                }
1067                        }
1068                }
1069        }
1070
1071        return modes;
1072}
1073
1074static void
1075do_established_modes(struct detailed_timing *timing, void *c)
1076{
1077        struct detailed_mode_closure *closure = c;
1078        struct detailed_non_pixel *data = &timing->data.other_data;
1079
1080        if (data->type == EDID_DETAIL_EST_TIMINGS)
1081                closure->modes += drm_est3_modes(closure->connector, timing);
1082}
1083
1084/**
1085 * add_established_modes - get est. modes from EDID and add them
1086 * @edid: EDID block to scan
1087 *
1088 * Each EDID block contains a bitmap of the supported "established modes" list
1089 * (defined above).  Tease them out and add them to the global modes list.
1090 */
1091static int
1092add_established_modes(struct drm_connector *connector, struct edid *edid)
1093{
1094        struct drm_device *dev = connector->dev;
1095        unsigned long est_bits = edid->established_timings.t1 |
1096                (edid->established_timings.t2 << 8) |
1097                ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1098        int i, modes = 0;
1099        struct detailed_mode_closure closure = {
1100                connector, edid, 0, 0, 0
1101        };
1102
1103        for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1104                if (est_bits & (1<<i)) {
1105                        struct drm_display_mode *newmode;
1106                        newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1107                        if (newmode) {
1108                                drm_mode_probed_add(connector, newmode);
1109                                modes++;
1110                        }
1111                }
1112        }
1113
1114        if (version_greater(edid, 1, 0))
1115                    drm_for_each_detailed_block((u8 *)edid,
1116                                                do_established_modes, &closure);
1117
1118        return modes + closure.modes;
1119}
1120
1121static void
1122do_standard_modes(struct detailed_timing *timing, void *c)
1123{
1124        struct detailed_mode_closure *closure = c;
1125        struct detailed_non_pixel *data = &timing->data.other_data;
1126        struct drm_connector *connector = closure->connector;
1127        struct edid *edid = closure->edid;
1128
1129        if (data->type == EDID_DETAIL_STD_MODES) {
1130                int i;
1131                for (i = 0; i < 6; i++) {
1132                        struct std_timing *std;
1133                        struct drm_display_mode *newmode;
1134
1135                        std = &data->data.timings[i];
1136                        newmode = drm_mode_std(connector, edid, std,
1137                                               edid->revision);
1138                        if (newmode) {
1139                                drm_mode_probed_add(connector, newmode);
1140                                closure->modes++;
1141                        }
1142                }
1143        }
1144}
1145
1146/**
1147 * add_standard_modes - get std. modes from EDID and add them
1148 * @edid: EDID block to scan
1149 *
1150 * Standard modes can be calculated using the appropriate standard (DMT,
1151 * GTF or CVT. Grab them from @edid and add them to the list.
1152 */
1153static int
1154add_standard_modes(struct drm_connector *connector, struct edid *edid)
1155{
1156        int i, modes = 0;
1157        struct detailed_mode_closure closure = {
1158                connector, edid, 0, 0, 0
1159        };
1160
1161        for (i = 0; i < EDID_STD_TIMINGS; i++) {
1162                struct drm_display_mode *newmode;
1163
1164                newmode = drm_mode_std(connector, edid,
1165                                       &edid->standard_timings[i],
1166                                       edid->revision);
1167                if (newmode) {
1168                        drm_mode_probed_add(connector, newmode);
1169                        modes++;
1170                }
1171        }
1172
1173        if (version_greater(edid, 1, 0))
1174                drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1175                                            &closure);
1176
1177        /* XXX should also look for standard codes in VTB blocks */
1178
1179        return modes + closure.modes;
1180}
1181
1182static int drm_cvt_modes(struct drm_connector *connector,
1183                         struct detailed_timing *timing)
1184{
1185        int i, j, modes = 0;
1186        struct drm_display_mode *newmode;
1187        struct drm_device *dev = connector->dev;
1188        struct cvt_timing *cvt;
1189        const int rates[] = { 60, 85, 75, 60, 50 };
1190        const u8 empty[3] = { 0, 0, 0 };
1191
1192        for (i = 0; i < 4; i++) {
1193                int uninitialized_var(width), height;
1194                cvt = &(timing->data.other_data.data.cvt[i]);
1195
1196                if (!memcmp(cvt->code, empty, 3))
1197                        continue;
1198
1199                height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1200                switch (cvt->code[1] & 0x0c) {
1201                case 0x00:
1202                        width = height * 4 / 3;
1203                        break;
1204                case 0x04:
1205                        width = height * 16 / 9;
1206                        break;
1207                case 0x08:
1208                        width = height * 16 / 10;
1209                        break;
1210                case 0x0c:
1211                        width = height * 15 / 9;
1212                        break;
1213                }
1214
1215                for (j = 1; j < 5; j++) {
1216                        if (cvt->code[2] & (1 << j)) {
1217                                newmode = drm_cvt_mode(dev, width, height,
1218                                                       rates[j], j == 0,
1219                                                       false, false);
1220                                if (newmode) {
1221                                        drm_mode_probed_add(connector, newmode);
1222                                        modes++;
1223                                }
1224                        }
1225                }
1226        }
1227
1228        return modes;
1229}
1230
1231static void
1232do_cvt_mode(struct detailed_timing *timing, void *c)
1233{
1234        struct detailed_mode_closure *closure = c;
1235        struct detailed_non_pixel *data = &timing->data.other_data;
1236
1237        if (data->type == EDID_DETAIL_CVT_3BYTE)
1238                closure->modes += drm_cvt_modes(closure->connector, timing);
1239}
1240
1241static int
1242add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1243{       
1244        struct detailed_mode_closure closure = {
1245                connector, edid, 0, 0, 0
1246        };
1247
1248        if (version_greater(edid, 1, 2))
1249                drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1250
1251        /* XXX should also look for CVT codes in VTB blocks */
1252
1253        return closure.modes;
1254}
1255
1256static void
1257do_detailed_mode(struct detailed_timing *timing, void *c)
1258{
1259        struct detailed_mode_closure *closure = c;
1260        struct drm_display_mode *newmode;
1261
1262        if (timing->pixel_clock) {
1263                newmode = drm_mode_detailed(closure->connector->dev,
1264                                            closure->edid, timing,
1265                                            closure->quirks);
1266                if (!newmode)
1267                        return;
1268
1269                if (closure->preferred)
1270                        newmode->type |= DRM_MODE_TYPE_PREFERRED;
1271
1272                drm_mode_probed_add(closure->connector, newmode);
1273                closure->modes++;
1274                closure->preferred = 0;
1275        }
1276}
1277
1278/*
1279 * add_detailed_modes - Add modes from detailed timings
1280 * @connector: attached connector
1281 * @edid: EDID block to scan
1282 * @quirks: quirks to apply
1283 */
1284static int
1285add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1286                   u32 quirks)
1287{
1288        struct detailed_mode_closure closure = {
1289                connector,
1290                edid,
1291                1,
1292                quirks,
1293                0
1294        };
1295
1296        if (closure.preferred && !version_greater(edid, 1, 3))
1297                closure.preferred =
1298                    (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1299
1300        drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1301
1302        return closure.modes;
1303}
1304
1305#define HDMI_IDENTIFIER 0x000C03
1306#define AUDIO_BLOCK     0x01
1307#define VIDEO_BLOCK     0x02
1308#define VENDOR_BLOCK    0x03
1309#define SPEAKER_BLOCK   0x04
1310#define EDID_BASIC_AUDIO        (1 << 6)
1311
1312/**
1313 * Search EDID for CEA extension block.
1314 */
1315u8 *drm_find_cea_extension(struct edid *edid)
1316{
1317        u8 *edid_ext = NULL;
1318        int i;
1319
1320        /* No EDID or EDID extensions */
1321        if (edid == NULL || edid->extensions == 0)
1322                return NULL;
1323
1324        /* Find CEA extension */
1325        for (i = 0; i < edid->extensions; i++) {
1326                edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1327                if (edid_ext[0] == CEA_EXT)
1328                        break;
1329        }
1330
1331        if (i == edid->extensions)
1332                return NULL;
1333
1334        return edid_ext;
1335}
1336EXPORT_SYMBOL(drm_find_cea_extension);
1337
1338static int
1339do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1340{
1341        struct drm_device *dev = connector->dev;
1342        u8 * mode, cea_mode;
1343        int modes = 0;
1344
1345        for (mode = db; mode < db + len; mode++) {
1346                cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1347                if (cea_mode < drm_num_cea_modes) {
1348                        struct drm_display_mode *newmode;
1349                        newmode = drm_mode_duplicate(dev,
1350                                                     &edid_cea_modes[cea_mode]);
1351                        if (newmode) {
1352                                drm_mode_probed_add(connector, newmode);
1353                                modes++;
1354                        }
1355                }
1356        }
1357
1358        return modes;
1359}
1360
1361static int
1362add_cea_modes(struct drm_connector *connector, struct edid *edid)
1363{
1364        u8 * cea = drm_find_cea_extension(edid);
1365        u8 * db, dbl;
1366        int modes = 0;
1367
1368        if (cea && cea[1] >= 3) {
1369                for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1370                        dbl = db[0] & 0x1f;
1371                        if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK)
1372                                modes += do_cea_modes (connector, db+1, dbl);
1373                }
1374        }
1375
1376        return modes;
1377}
1378
1379static void
1380parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db)
1381{
1382        connector->eld[5] |= (db[6] >> 7) << 1;  /* Supports_AI */
1383
1384        connector->dvi_dual = db[6] & 1;
1385        connector->max_tmds_clock = db[7] * 5;
1386
1387        connector->latency_present[0] = db[8] >> 7;
1388        connector->latency_present[1] = (db[8] >> 6) & 1;
1389        connector->video_latency[0] = db[9];
1390        connector->audio_latency[0] = db[10];
1391        connector->video_latency[1] = db[11];
1392        connector->audio_latency[1] = db[12];
1393
1394        DRM_LOG_KMS("HDMI: DVI dual %d, "
1395                    "max TMDS clock %d, "
1396                    "latency present %d %d, "
1397                    "video latency %d %d, "
1398                    "audio latency %d %d\n",
1399                    connector->dvi_dual,
1400                    connector->max_tmds_clock,
1401              (int) connector->latency_present[0],
1402              (int) connector->latency_present[1],
1403                    connector->video_latency[0],
1404                    connector->video_latency[1],
1405                    connector->audio_latency[0],
1406                    connector->audio_latency[1]);
1407}
1408
1409static void
1410monitor_name(struct detailed_timing *t, void *data)
1411{
1412        if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1413                *(u8 **)data = t->data.other_data.data.str.str;
1414}
1415
1416/**
1417 * drm_edid_to_eld - build ELD from EDID
1418 * @connector: connector corresponding to the HDMI/DP sink
1419 * @edid: EDID to parse
1420 *
1421 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1422 * Some ELD fields are left to the graphics driver caller:
1423 * - Conn_Type
1424 * - HDCP
1425 * - Port_ID
1426 */
1427void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1428{
1429        uint8_t *eld = connector->eld;
1430        u8 *cea;
1431        u8 *name;
1432        u8 *db;
1433        int sad_count = 0;
1434        int mnl;
1435        int dbl;
1436
1437        memset(eld, 0, sizeof(connector->eld));
1438
1439        cea = drm_find_cea_extension(edid);
1440        if (!cea) {
1441                DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1442                return;
1443        }
1444
1445        name = NULL;
1446        drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1447        for (mnl = 0; name && mnl < 13; mnl++) {
1448                if (name[mnl] == 0x0a)
1449                        break;
1450                eld[20 + mnl] = name[mnl];
1451        }
1452        eld[4] = (cea[1] << 5) | mnl;
1453        DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1454
1455        eld[0] = 2 << 3;                /* ELD version: 2 */
1456
1457        eld[16] = edid->mfg_id[0];
1458        eld[17] = edid->mfg_id[1];
1459        eld[18] = edid->prod_code[0];
1460        eld[19] = edid->prod_code[1];
1461
1462        if (cea[1] >= 3)
1463                for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1464                        dbl = db[0] & 0x1f;
1465                        
1466                        switch ((db[0] & 0xe0) >> 5) {
1467                        case AUDIO_BLOCK:
1468                                /* Audio Data Block, contains SADs */
1469                                sad_count = dbl / 3;
1470                                memcpy(eld + 20 + mnl, &db[1], dbl);
1471                                break;
1472                        case SPEAKER_BLOCK:
1473                                /* Speaker Allocation Data Block */
1474                                eld[7] = db[1];
1475                                break;
1476                        case VENDOR_BLOCK:
1477                                /* HDMI Vendor-Specific Data Block */
1478                                if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0)
1479                                        parse_hdmi_vsdb(connector, db);
1480                                break;
1481                        default:
1482                                break;
1483                        }
1484                }
1485        eld[5] |= sad_count << 4;
1486        eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1487
1488        DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1489}
1490EXPORT_SYMBOL(drm_edid_to_eld);
1491
1492/**
1493 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1494 * @connector: connector associated with the HDMI/DP sink
1495 * @mode: the display mode
1496 */
1497int drm_av_sync_delay(struct drm_connector *connector,
1498                      struct drm_display_mode *mode)
1499{
1500        int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1501        int a, v;
1502
1503        if (!connector->latency_present[0])
1504                return 0;
1505        if (!connector->latency_present[1])
1506                i = 0;
1507
1508        a = connector->audio_latency[i];
1509        v = connector->video_latency[i];
1510
1511        /*
1512         * HDMI/DP sink doesn't support audio or video?
1513         */
1514        if (a == 255 || v == 255)
1515                return 0;
1516
1517        /*
1518         * Convert raw EDID values to millisecond.
1519         * Treat unknown latency as 0ms.
1520         */
1521        if (a)
1522                a = min(2 * (a - 1), 500);
1523        if (v)
1524                v = min(2 * (v - 1), 500);
1525
1526        return max(v - a, 0);
1527}
1528EXPORT_SYMBOL(drm_av_sync_delay);
1529
1530/**
1531 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1532 * @encoder: the encoder just changed display mode
1533 * @mode: the adjusted display mode
1534 *
1535 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1536 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1537 */
1538struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1539                                     struct drm_display_mode *mode)
1540{
1541        struct drm_connector *connector;
1542        struct drm_device *dev = encoder->dev;
1543
1544        list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1545                if (connector->encoder == encoder && connector->eld[0])
1546                        return connector;
1547
1548        return NULL;
1549}
1550EXPORT_SYMBOL(drm_select_eld);
1551
1552/**
1553 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1554 * @edid: monitor EDID information
1555 *
1556 * Parse the CEA extension according to CEA-861-B.
1557 * Return true if HDMI, false if not or unknown.
1558 */
1559bool drm_detect_hdmi_monitor(struct edid *edid)
1560{
1561        u8 *edid_ext;
1562        int i, hdmi_id;
1563        int start_offset, end_offset;
1564        bool is_hdmi = false;
1565
1566        edid_ext = drm_find_cea_extension(edid);
1567        if (!edid_ext)
1568                goto end;
1569
1570        /* Data block offset in CEA extension block */
1571        start_offset = 4;
1572        end_offset = edid_ext[2];
1573
1574        /*
1575         * Because HDMI identifier is in Vendor Specific Block,
1576         * search it from all data blocks of CEA extension.
1577         */
1578        for (i = start_offset; i < end_offset;
1579                /* Increased by data block len */
1580                i += ((edid_ext[i] & 0x1f) + 1)) {
1581                /* Find vendor specific block */
1582                if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1583                        hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1584                                  edid_ext[i + 3] << 16;
1585                        /* Find HDMI identifier */
1586                        if (hdmi_id == HDMI_IDENTIFIER)
1587                                is_hdmi = true;
1588                        break;
1589                }
1590        }
1591
1592end:
1593        return is_hdmi;
1594}
1595EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1596
1597/**
1598 * drm_detect_monitor_audio - check monitor audio capability
1599 *
1600 * Monitor should have CEA extension block.
1601 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1602 * audio' only. If there is any audio extension block and supported
1603 * audio format, assume at least 'basic audio' support, even if 'basic
1604 * audio' is not defined in EDID.
1605 *
1606 */
1607bool drm_detect_monitor_audio(struct edid *edid)
1608{
1609        u8 *edid_ext;
1610        int i, j;
1611        bool has_audio = false;
1612        int start_offset, end_offset;
1613
1614        edid_ext = drm_find_cea_extension(edid);
1615        if (!edid_ext)
1616                goto end;
1617
1618        has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1619
1620        if (has_audio) {
1621                DRM_DEBUG_KMS("Monitor has basic audio support\n");
1622                goto end;
1623        }
1624
1625        /* Data block offset in CEA extension block */
1626        start_offset = 4;
1627        end_offset = edid_ext[2];
1628
1629        for (i = start_offset; i < end_offset;
1630                        i += ((edid_ext[i] & 0x1f) + 1)) {
1631                if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1632                        has_audio = true;
1633                        for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1634                                DRM_DEBUG_KMS("CEA audio format %d\n",
1635                                              (edid_ext[i + j] >> 3) & 0xf);
1636                        goto end;
1637                }
1638        }
1639end:
1640        return has_audio;
1641}
1642EXPORT_SYMBOL(drm_detect_monitor_audio);
1643
1644/**
1645 * drm_add_display_info - pull display info out if present
1646 * @edid: EDID data
1647 * @info: display info (attached to connector)
1648 *
1649 * Grab any available display info and stuff it into the drm_display_info
1650 * structure that's part of the connector.  Useful for tracking bpp and
1651 * color spaces.
1652 */
1653static void drm_add_display_info(struct edid *edid,
1654                                 struct drm_display_info *info)
1655{
1656        u8 *edid_ext;
1657
1658        info->width_mm = edid->width_cm * 10;
1659        info->height_mm = edid->height_cm * 10;
1660
1661        /* driver figures it out in this case */
1662        info->bpc = 0;
1663        info->color_formats = 0;
1664
1665        /* Only defined for 1.4 with digital displays */
1666        if (edid->revision < 4)
1667                return;
1668
1669        if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1670                return;
1671
1672        switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1673        case DRM_EDID_DIGITAL_DEPTH_6:
1674                info->bpc = 6;
1675                break;
1676        case DRM_EDID_DIGITAL_DEPTH_8:
1677                info->bpc = 8;
1678                break;
1679        case DRM_EDID_DIGITAL_DEPTH_10:
1680                info->bpc = 10;
1681                break;
1682        case DRM_EDID_DIGITAL_DEPTH_12:
1683                info->bpc = 12;
1684                break;
1685        case DRM_EDID_DIGITAL_DEPTH_14:
1686                info->bpc = 14;
1687                break;
1688        case DRM_EDID_DIGITAL_DEPTH_16:
1689                info->bpc = 16;
1690                break;
1691        case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1692        default:
1693                info->bpc = 0;
1694                break;
1695        }
1696
1697        info->color_formats = DRM_COLOR_FORMAT_RGB444;
1698        if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444)
1699                info->color_formats = DRM_COLOR_FORMAT_YCRCB444;
1700        if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422)
1701                info->color_formats = DRM_COLOR_FORMAT_YCRCB422;
1702
1703        /* Get data from CEA blocks if present */
1704        edid_ext = drm_find_cea_extension(edid);
1705        if (!edid_ext)
1706                return;
1707
1708        info->cea_rev = edid_ext[1];
1709}
1710
1711/**
1712 * drm_add_edid_modes - add modes from EDID data, if available
1713 * @connector: connector we're probing
1714 * @edid: edid data
1715 *
1716 * Add the specified modes to the connector's mode list.
1717 *
1718 * Return number of modes added or 0 if we couldn't find any.
1719 */
1720int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1721{
1722        int num_modes = 0;
1723        u32 quirks;
1724
1725        if (edid == NULL) {
1726                return 0;
1727        }
1728        if (!drm_edid_is_valid(edid)) {
1729                dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1730                         drm_get_connector_name(connector));
1731                return 0;
1732        }
1733
1734        quirks = edid_get_quirks(edid);
1735
1736        /*
1737         * EDID spec says modes should be preferred in this order:
1738         * - preferred detailed mode
1739         * - other detailed modes from base block
1740         * - detailed modes from extension blocks
1741         * - CVT 3-byte code modes
1742         * - standard timing codes
1743         * - established timing codes
1744         * - modes inferred from GTF or CVT range information
1745         *
1746         * We get this pretty much right.
1747         *
1748         * XXX order for additional mode types in extension blocks?
1749         */
1750        num_modes += add_detailed_modes(connector, edid, quirks);
1751        num_modes += add_cvt_modes(connector, edid);
1752        num_modes += add_standard_modes(connector, edid);
1753        num_modes += add_established_modes(connector, edid);
1754        num_modes += add_inferred_modes(connector, edid);
1755        num_modes += add_cea_modes(connector, edid);
1756
1757        if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1758                edid_fixup_preferred(connector, quirks);
1759
1760        drm_add_display_info(edid, &connector->display_info);
1761
1762        return num_modes;
1763}
1764EXPORT_SYMBOL(drm_add_edid_modes);
1765
1766/**
1767 * drm_add_modes_noedid - add modes for the connectors without EDID
1768 * @connector: connector we're probing
1769 * @hdisplay: the horizontal display limit
1770 * @vdisplay: the vertical display limit
1771 *
1772 * Add the specified modes to the connector's mode list. Only when the
1773 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1774 *
1775 * Return number of modes added or 0 if we couldn't find any.
1776 */
1777int drm_add_modes_noedid(struct drm_connector *connector,
1778                        int hdisplay, int vdisplay)
1779{
1780        int i, count, num_modes = 0;
1781        struct drm_display_mode *mode;
1782        struct drm_device *dev = connector->dev;
1783
1784        count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1785        if (hdisplay < 0)
1786                hdisplay = 0;
1787        if (vdisplay < 0)
1788                vdisplay = 0;
1789
1790        for (i = 0; i < count; i++) {
1791                const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1792                if (hdisplay && vdisplay) {
1793                        /*
1794                         * Only when two are valid, they will be used to check
1795                         * whether the mode should be added to the mode list of
1796                         * the connector.
1797                         */
1798                        if (ptr->hdisplay > hdisplay ||
1799                                        ptr->vdisplay > vdisplay)
1800                                continue;
1801                }
1802                if (drm_mode_vrefresh(ptr) > 61)
1803                        continue;
1804                mode = drm_mode_duplicate(dev, ptr);
1805                if (mode) {
1806                        drm_mode_probed_add(connector, mode);
1807                        num_modes++;
1808                }
1809        }
1810        return num_modes;
1811}
1812EXPORT_SYMBOL(drm_add_modes_noedid);
1813
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