Root/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 * 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/module.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/* Force reduced-blanking timings for detailed modes */
70#define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7)
71
72struct detailed_mode_closure {
73    struct drm_connector *connector;
74    struct edid *edid;
75    bool preferred;
76    u32 quirks;
77    int modes;
78};
79
80#define LEVEL_DMT 0
81#define LEVEL_GTF 1
82#define LEVEL_GTF2 2
83#define LEVEL_CVT 3
84
85static struct edid_quirk {
86    char vendor[4];
87    int product_id;
88    u32 quirks;
89} edid_quirk_list[] = {
90    /* ASUS VW222S */
91    { "ACI", 0x22a2, EDID_QUIRK_FORCE_REDUCED_BLANKING },
92
93    /* Acer AL1706 */
94    { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
95    /* Acer F51 */
96    { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
97    /* Unknown Acer */
98    { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
99
100    /* Belinea 10 15 55 */
101    { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
102    { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
103
104    /* Envision Peripherals, Inc. EN-7100e */
105    { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
106    /* Envision EN2028 */
107    { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
108
109    /* Funai Electronics PM36B */
110    { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
111      EDID_QUIRK_DETAILED_IN_CM },
112
113    /* LG Philips LCD LP154W01-A5 */
114    { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
115    { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
116
117    /* Philips 107p5 CRT */
118    { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
119
120    /* Proview AY765C */
121    { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
122
123    /* Samsung SyncMaster 205BW. Note: irony */
124    { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
125    /* Samsung SyncMaster 22[5-6]BW */
126    { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
127    { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
128
129    /* ViewSonic VA2026w */
130    { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
131};
132
133/*** DDC fetch and block validation ***/
134
135static const u8 edid_header[] = {
136    0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
137};
138
139 /*
140 * Sanity check the header of the base EDID block. Return 8 if the header
141 * is perfect, down to 0 if it's totally wrong.
142 */
143int drm_edid_header_is_valid(const u8 *raw_edid)
144{
145    int i, score = 0;
146
147    for (i = 0; i < sizeof(edid_header); i++)
148        if (raw_edid[i] == edid_header[i])
149            score++;
150
151    return score;
152}
153EXPORT_SYMBOL(drm_edid_header_is_valid);
154
155static int edid_fixup __read_mostly = 6;
156module_param_named(edid_fixup, edid_fixup, int, 0400);
157MODULE_PARM_DESC(edid_fixup,
158         "Minimum number of valid EDID header bytes (0-8, default 6)");
159
160/*
161 * Sanity check the EDID block (base or extension). Return 0 if the block
162 * doesn't check out, or 1 if it's valid.
163 */
164bool drm_edid_block_valid(u8 *raw_edid, int block)
165{
166    int i;
167    u8 csum = 0;
168    struct edid *edid = (struct edid *)raw_edid;
169
170    if (edid_fixup > 8 || edid_fixup < 0)
171        edid_fixup = 6;
172
173    if (block == 0) {
174        int score = drm_edid_header_is_valid(raw_edid);
175        if (score == 8) ;
176        else if (score >= edid_fixup) {
177            DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
178            memcpy(raw_edid, edid_header, sizeof(edid_header));
179        } else {
180            goto bad;
181        }
182    }
183
184    for (i = 0; i < EDID_LENGTH; i++)
185        csum += raw_edid[i];
186    if (csum) {
187        DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
188
189        /* allow CEA to slide through, switches mangle this */
190        if (raw_edid[0] != 0x02)
191            goto bad;
192    }
193
194    /* per-block-type checks */
195    switch (raw_edid[0]) {
196    case 0: /* base */
197        if (edid->version != 1) {
198            DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
199            goto bad;
200        }
201
202        if (edid->revision > 4)
203            DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
204        break;
205
206    default:
207        break;
208    }
209
210    return 1;
211
212bad:
213    if (raw_edid) {
214        printk(KERN_ERR "Raw EDID:\n");
215        print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
216                   raw_edid, EDID_LENGTH, false);
217    }
218    return 0;
219}
220EXPORT_SYMBOL(drm_edid_block_valid);
221
222/**
223 * drm_edid_is_valid - sanity check EDID data
224 * @edid: EDID data
225 *
226 * Sanity-check an entire EDID record (including extensions)
227 */
228bool drm_edid_is_valid(struct edid *edid)
229{
230    int i;
231    u8 *raw = (u8 *)edid;
232
233    if (!edid)
234        return false;
235
236    for (i = 0; i <= edid->extensions; i++)
237        if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i))
238            return false;
239
240    return true;
241}
242EXPORT_SYMBOL(drm_edid_is_valid);
243
244#define DDC_SEGMENT_ADDR 0x30
245/**
246 * Get EDID information via I2C.
247 *
248 * \param adapter : i2c device adaptor
249 * \param buf : EDID data buffer to be filled
250 * \param len : EDID data buffer length
251 * \return 0 on success or -1 on failure.
252 *
253 * Try to fetch EDID information by calling i2c driver function.
254 */
255static int
256drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
257              int block, int len)
258{
259    unsigned char start = block * EDID_LENGTH;
260    int ret, retries = 5;
261
262    /* The core i2c driver will automatically retry the transfer if the
263     * adapter reports EAGAIN. However, we find that bit-banging transfers
264     * are susceptible to errors under a heavily loaded machine and
265     * generate spurious NAKs and timeouts. Retrying the transfer
266     * of the individual block a few times seems to overcome this.
267     */
268    do {
269        struct i2c_msg msgs[] = {
270            {
271                .addr = DDC_ADDR,
272                .flags = 0,
273                .len = 1,
274                .buf = &start,
275            }, {
276                .addr = DDC_ADDR,
277                .flags = I2C_M_RD,
278                .len = len,
279                .buf = buf,
280            }
281        };
282        ret = i2c_transfer(adapter, msgs, 2);
283        if (ret == -ENXIO) {
284            DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
285                    adapter->name);
286            break;
287        }
288    } while (ret != 2 && --retries);
289
290    return ret == 2 ? 0 : -1;
291}
292
293static bool drm_edid_is_zero(u8 *in_edid, int length)
294{
295    int i;
296    u32 *raw_edid = (u32 *)in_edid;
297
298    for (i = 0; i < length / 4; i++)
299        if (*(raw_edid + i) != 0)
300            return false;
301    return true;
302}
303
304static u8 *
305drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
306{
307    int i, j = 0, valid_extensions = 0;
308    u8 *block, *new;
309
310    if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
311        return NULL;
312
313    /* base block fetch */
314    for (i = 0; i < 4; i++) {
315        if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
316            goto out;
317        if (drm_edid_block_valid(block, 0))
318            break;
319        if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
320            connector->null_edid_counter++;
321            goto carp;
322        }
323    }
324    if (i == 4)
325        goto carp;
326
327    /* if there's no extensions, we're done */
328    if (block[0x7e] == 0)
329        return block;
330
331    new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
332    if (!new)
333        goto out;
334    block = new;
335
336    for (j = 1; j <= block[0x7e]; j++) {
337        for (i = 0; i < 4; i++) {
338            if (drm_do_probe_ddc_edid(adapter,
339                  block + (valid_extensions + 1) * EDID_LENGTH,
340                  j, EDID_LENGTH))
341                goto out;
342            if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j)) {
343                valid_extensions++;
344                break;
345            }
346        }
347        if (i == 4)
348            dev_warn(connector->dev->dev,
349             "%s: Ignoring invalid EDID block %d.\n",
350             drm_get_connector_name(connector), j);
351    }
352
353    if (valid_extensions != block[0x7e]) {
354        block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
355        block[0x7e] = valid_extensions;
356        new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
357        if (!new)
358            goto out;
359        block = new;
360    }
361
362    return block;
363
364carp:
365    dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
366         drm_get_connector_name(connector), j);
367
368out:
369    kfree(block);
370    return NULL;
371}
372
373/**
374 * Probe DDC presence.
375 *
376 * \param adapter : i2c device adaptor
377 * \return 1 on success
378 */
379static bool
380drm_probe_ddc(struct i2c_adapter *adapter)
381{
382    unsigned char out;
383
384    return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
385}
386
387/**
388 * drm_get_edid - get EDID data, if available
389 * @connector: connector we're probing
390 * @adapter: i2c adapter to use for DDC
391 *
392 * Poke the given i2c channel to grab EDID data if possible. If found,
393 * attach it to the connector.
394 *
395 * Return edid data or NULL if we couldn't find any.
396 */
397struct edid *drm_get_edid(struct drm_connector *connector,
398              struct i2c_adapter *adapter)
399{
400    struct edid *edid = NULL;
401
402    if (drm_probe_ddc(adapter))
403        edid = (struct edid *)drm_do_get_edid(connector, adapter);
404
405    connector->display_info.raw_edid = (char *)edid;
406
407    return edid;
408
409}
410EXPORT_SYMBOL(drm_get_edid);
411
412/*** EDID parsing ***/
413
414/**
415 * edid_vendor - match a string against EDID's obfuscated vendor field
416 * @edid: EDID to match
417 * @vendor: vendor string
418 *
419 * Returns true if @vendor is in @edid, false otherwise
420 */
421static bool edid_vendor(struct edid *edid, char *vendor)
422{
423    char edid_vendor[3];
424
425    edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
426    edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
427              ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
428    edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
429
430    return !strncmp(edid_vendor, vendor, 3);
431}
432
433/**
434 * edid_get_quirks - return quirk flags for a given EDID
435 * @edid: EDID to process
436 *
437 * This tells subsequent routines what fixes they need to apply.
438 */
439static u32 edid_get_quirks(struct edid *edid)
440{
441    struct edid_quirk *quirk;
442    int i;
443
444    for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
445        quirk = &edid_quirk_list[i];
446
447        if (edid_vendor(edid, quirk->vendor) &&
448            (EDID_PRODUCT_ID(edid) == quirk->product_id))
449            return quirk->quirks;
450    }
451
452    return 0;
453}
454
455#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
456#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
457
458/**
459 * edid_fixup_preferred - set preferred modes based on quirk list
460 * @connector: has mode list to fix up
461 * @quirks: quirks list
462 *
463 * Walk the mode list for @connector, clearing the preferred status
464 * on existing modes and setting it anew for the right mode ala @quirks.
465 */
466static void edid_fixup_preferred(struct drm_connector *connector,
467                 u32 quirks)
468{
469    struct drm_display_mode *t, *cur_mode, *preferred_mode;
470    int target_refresh = 0;
471
472    if (list_empty(&connector->probed_modes))
473        return;
474
475    if (quirks & EDID_QUIRK_PREFER_LARGE_60)
476        target_refresh = 60;
477    if (quirks & EDID_QUIRK_PREFER_LARGE_75)
478        target_refresh = 75;
479
480    preferred_mode = list_first_entry(&connector->probed_modes,
481                      struct drm_display_mode, head);
482
483    list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
484        cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
485
486        if (cur_mode == preferred_mode)
487            continue;
488
489        /* Largest mode is preferred */
490        if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
491            preferred_mode = cur_mode;
492
493        /* At a given size, try to get closest to target refresh */
494        if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
495            MODE_REFRESH_DIFF(cur_mode, target_refresh) <
496            MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
497            preferred_mode = cur_mode;
498        }
499    }
500
501    preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
502}
503
504static bool
505mode_is_rb(const struct drm_display_mode *mode)
506{
507    return (mode->htotal - mode->hdisplay == 160) &&
508           (mode->hsync_end - mode->hdisplay == 80) &&
509           (mode->hsync_end - mode->hsync_start == 32) &&
510           (mode->vsync_start - mode->vdisplay == 3);
511}
512
513/*
514 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
515 * @dev: Device to duplicate against
516 * @hsize: Mode width
517 * @vsize: Mode height
518 * @fresh: Mode refresh rate
519 * @rb: Mode reduced-blanking-ness
520 *
521 * Walk the DMT mode list looking for a match for the given parameters.
522 * Return a newly allocated copy of the mode, or NULL if not found.
523 */
524struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
525                       int hsize, int vsize, int fresh,
526                       bool rb)
527{
528    int i;
529
530    for (i = 0; i < drm_num_dmt_modes; i++) {
531        const struct drm_display_mode *ptr = &drm_dmt_modes[i];
532        if (hsize != ptr->hdisplay)
533            continue;
534        if (vsize != ptr->vdisplay)
535            continue;
536        if (fresh != drm_mode_vrefresh(ptr))
537            continue;
538        if (rb != mode_is_rb(ptr))
539            continue;
540
541        return drm_mode_duplicate(dev, ptr);
542    }
543
544    return NULL;
545}
546EXPORT_SYMBOL(drm_mode_find_dmt);
547
548typedef void detailed_cb(struct detailed_timing *timing, void *closure);
549
550static void
551cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
552{
553    int i, n = 0;
554    u8 d = ext[0x02];
555    u8 *det_base = ext + d;
556
557    n = (127 - d) / 18;
558    for (i = 0; i < n; i++)
559        cb((struct detailed_timing *)(det_base + 18 * i), closure);
560}
561
562static void
563vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
564{
565    unsigned int i, n = min((int)ext[0x02], 6);
566    u8 *det_base = ext + 5;
567
568    if (ext[0x01] != 1)
569        return; /* unknown version */
570
571    for (i = 0; i < n; i++)
572        cb((struct detailed_timing *)(det_base + 18 * i), closure);
573}
574
575static void
576drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
577{
578    int i;
579    struct edid *edid = (struct edid *)raw_edid;
580
581    if (edid == NULL)
582        return;
583
584    for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
585        cb(&(edid->detailed_timings[i]), closure);
586
587    for (i = 1; i <= raw_edid[0x7e]; i++) {
588        u8 *ext = raw_edid + (i * EDID_LENGTH);
589        switch (*ext) {
590        case CEA_EXT:
591            cea_for_each_detailed_block(ext, cb, closure);
592            break;
593        case VTB_EXT:
594            vtb_for_each_detailed_block(ext, cb, closure);
595            break;
596        default:
597            break;
598        }
599    }
600}
601
602static void
603is_rb(struct detailed_timing *t, void *data)
604{
605    u8 *r = (u8 *)t;
606    if (r[3] == EDID_DETAIL_MONITOR_RANGE)
607        if (r[15] & 0x10)
608            *(bool *)data = true;
609}
610
611/* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
612static bool
613drm_monitor_supports_rb(struct edid *edid)
614{
615    if (edid->revision >= 4) {
616        bool ret = false;
617        drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
618        return ret;
619    }
620
621    return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
622}
623
624static void
625find_gtf2(struct detailed_timing *t, void *data)
626{
627    u8 *r = (u8 *)t;
628    if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
629        *(u8 **)data = r;
630}
631
632/* Secondary GTF curve kicks in above some break frequency */
633static int
634drm_gtf2_hbreak(struct edid *edid)
635{
636    u8 *r = NULL;
637    drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
638    return r ? (r[12] * 2) : 0;
639}
640
641static int
642drm_gtf2_2c(struct edid *edid)
643{
644    u8 *r = NULL;
645    drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
646    return r ? r[13] : 0;
647}
648
649static int
650drm_gtf2_m(struct edid *edid)
651{
652    u8 *r = NULL;
653    drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
654    return r ? (r[15] << 8) + r[14] : 0;
655}
656
657static int
658drm_gtf2_k(struct edid *edid)
659{
660    u8 *r = NULL;
661    drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
662    return r ? r[16] : 0;
663}
664
665static int
666drm_gtf2_2j(struct edid *edid)
667{
668    u8 *r = NULL;
669    drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
670    return r ? r[17] : 0;
671}
672
673/**
674 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
675 * @edid: EDID block to scan
676 */
677static int standard_timing_level(struct edid *edid)
678{
679    if (edid->revision >= 2) {
680        if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
681            return LEVEL_CVT;
682        if (drm_gtf2_hbreak(edid))
683            return LEVEL_GTF2;
684        return LEVEL_GTF;
685    }
686    return LEVEL_DMT;
687}
688
689/*
690 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
691 * monitors fill with ascii space (0x20) instead.
692 */
693static int
694bad_std_timing(u8 a, u8 b)
695{
696    return (a == 0x00 && b == 0x00) ||
697           (a == 0x01 && b == 0x01) ||
698           (a == 0x20 && b == 0x20);
699}
700
701/**
702 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
703 * @t: standard timing params
704 * @timing_level: standard timing level
705 *
706 * Take the standard timing params (in this case width, aspect, and refresh)
707 * and convert them into a real mode using CVT/GTF/DMT.
708 */
709static struct drm_display_mode *
710drm_mode_std(struct drm_connector *connector, struct edid *edid,
711         struct std_timing *t, int revision)
712{
713    struct drm_device *dev = connector->dev;
714    struct drm_display_mode *m, *mode = NULL;
715    int hsize, vsize;
716    int vrefresh_rate;
717    unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
718        >> EDID_TIMING_ASPECT_SHIFT;
719    unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
720        >> EDID_TIMING_VFREQ_SHIFT;
721    int timing_level = standard_timing_level(edid);
722
723    if (bad_std_timing(t->hsize, t->vfreq_aspect))
724        return NULL;
725
726    /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
727    hsize = t->hsize * 8 + 248;
728    /* vrefresh_rate = vfreq + 60 */
729    vrefresh_rate = vfreq + 60;
730    /* the vdisplay is calculated based on the aspect ratio */
731    if (aspect_ratio == 0) {
732        if (revision < 3)
733            vsize = hsize;
734        else
735            vsize = (hsize * 10) / 16;
736    } else if (aspect_ratio == 1)
737        vsize = (hsize * 3) / 4;
738    else if (aspect_ratio == 2)
739        vsize = (hsize * 4) / 5;
740    else
741        vsize = (hsize * 9) / 16;
742
743    /* HDTV hack, part 1 */
744    if (vrefresh_rate == 60 &&
745        ((hsize == 1360 && vsize == 765) ||
746         (hsize == 1368 && vsize == 769))) {
747        hsize = 1366;
748        vsize = 768;
749    }
750
751    /*
752     * If this connector already has a mode for this size and refresh
753     * rate (because it came from detailed or CVT info), use that
754     * instead. This way we don't have to guess at interlace or
755     * reduced blanking.
756     */
757    list_for_each_entry(m, &connector->probed_modes, head)
758        if (m->hdisplay == hsize && m->vdisplay == vsize &&
759            drm_mode_vrefresh(m) == vrefresh_rate)
760            return NULL;
761
762    /* HDTV hack, part 2 */
763    if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
764        mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
765                    false);
766        mode->hdisplay = 1366;
767        mode->hsync_start = mode->hsync_start - 1;
768        mode->hsync_end = mode->hsync_end - 1;
769        return mode;
770    }
771
772    /* check whether it can be found in default mode table */
773    if (drm_monitor_supports_rb(edid)) {
774        mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
775                     true);
776        if (mode)
777            return mode;
778    }
779    mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
780    if (mode)
781        return mode;
782
783    /* okay, generate it */
784    switch (timing_level) {
785    case LEVEL_DMT:
786        break;
787    case LEVEL_GTF:
788        mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
789        break;
790    case LEVEL_GTF2:
791        /*
792         * This is potentially wrong if there's ever a monitor with
793         * more than one ranges section, each claiming a different
794         * secondary GTF curve. Please don't do that.
795         */
796        mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
797        if (!mode)
798            return NULL;
799        if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
800            drm_mode_destroy(dev, mode);
801            mode = drm_gtf_mode_complex(dev, hsize, vsize,
802                            vrefresh_rate, 0, 0,
803                            drm_gtf2_m(edid),
804                            drm_gtf2_2c(edid),
805                            drm_gtf2_k(edid),
806                            drm_gtf2_2j(edid));
807        }
808        break;
809    case LEVEL_CVT:
810        mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
811                    false);
812        break;
813    }
814    return mode;
815}
816
817/*
818 * EDID is delightfully ambiguous about how interlaced modes are to be
819 * encoded. Our internal representation is of frame height, but some
820 * HDTV detailed timings are encoded as field height.
821 *
822 * The format list here is from CEA, in frame size. Technically we
823 * should be checking refresh rate too. Whatever.
824 */
825static void
826drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
827                struct detailed_pixel_timing *pt)
828{
829    int i;
830    static const struct {
831        int w, h;
832    } cea_interlaced[] = {
833        { 1920, 1080 },
834        { 720, 480 },
835        { 1440, 480 },
836        { 2880, 480 },
837        { 720, 576 },
838        { 1440, 576 },
839        { 2880, 576 },
840    };
841
842    if (!(pt->misc & DRM_EDID_PT_INTERLACED))
843        return;
844
845    for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
846        if ((mode->hdisplay == cea_interlaced[i].w) &&
847            (mode->vdisplay == cea_interlaced[i].h / 2)) {
848            mode->vdisplay *= 2;
849            mode->vsync_start *= 2;
850            mode->vsync_end *= 2;
851            mode->vtotal *= 2;
852            mode->vtotal |= 1;
853        }
854    }
855
856    mode->flags |= DRM_MODE_FLAG_INTERLACE;
857}
858
859/**
860 * drm_mode_detailed - create a new mode from an EDID detailed timing section
861 * @dev: DRM device (needed to create new mode)
862 * @edid: EDID block
863 * @timing: EDID detailed timing info
864 * @quirks: quirks to apply
865 *
866 * An EDID detailed timing block contains enough info for us to create and
867 * return a new struct drm_display_mode.
868 */
869static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
870                          struct edid *edid,
871                          struct detailed_timing *timing,
872                          u32 quirks)
873{
874    struct drm_display_mode *mode;
875    struct detailed_pixel_timing *pt = &timing->data.pixel_data;
876    unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
877    unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
878    unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
879    unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
880    unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
881    unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
882    unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
883    unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
884
885    /* ignore tiny modes */
886    if (hactive < 64 || vactive < 64)
887        return NULL;
888
889    if (pt->misc & DRM_EDID_PT_STEREO) {
890        printk(KERN_WARNING "stereo mode not supported\n");
891        return NULL;
892    }
893    if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
894        printk(KERN_WARNING "composite sync not supported\n");
895    }
896
897    /* it is incorrect if hsync/vsync width is zero */
898    if (!hsync_pulse_width || !vsync_pulse_width) {
899        DRM_DEBUG_KMS("Incorrect Detailed timing. "
900                "Wrong Hsync/Vsync pulse width\n");
901        return NULL;
902    }
903
904    if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
905        mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
906        if (!mode)
907            return NULL;
908
909        goto set_size;
910    }
911
912    mode = drm_mode_create(dev);
913    if (!mode)
914        return NULL;
915
916    if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
917        timing->pixel_clock = cpu_to_le16(1088);
918
919    mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
920
921    mode->hdisplay = hactive;
922    mode->hsync_start = mode->hdisplay + hsync_offset;
923    mode->hsync_end = mode->hsync_start + hsync_pulse_width;
924    mode->htotal = mode->hdisplay + hblank;
925
926    mode->vdisplay = vactive;
927    mode->vsync_start = mode->vdisplay + vsync_offset;
928    mode->vsync_end = mode->vsync_start + vsync_pulse_width;
929    mode->vtotal = mode->vdisplay + vblank;
930
931    /* Some EDIDs have bogus h/vtotal values */
932    if (mode->hsync_end > mode->htotal)
933        mode->htotal = mode->hsync_end + 1;
934    if (mode->vsync_end > mode->vtotal)
935        mode->vtotal = mode->vsync_end + 1;
936
937    drm_mode_do_interlace_quirk(mode, pt);
938
939    if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
940        pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
941    }
942
943    mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
944        DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
945    mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
946        DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
947
948set_size:
949    mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
950    mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
951
952    if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
953        mode->width_mm *= 10;
954        mode->height_mm *= 10;
955    }
956
957    if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
958        mode->width_mm = edid->width_cm * 10;
959        mode->height_mm = edid->height_cm * 10;
960    }
961
962    mode->type = DRM_MODE_TYPE_DRIVER;
963    drm_mode_set_name(mode);
964
965    return mode;
966}
967
968static bool
969mode_in_hsync_range(const struct drm_display_mode *mode,
970            struct edid *edid, u8 *t)
971{
972    int hsync, hmin, hmax;
973
974    hmin = t[7];
975    if (edid->revision >= 4)
976        hmin += ((t[4] & 0x04) ? 255 : 0);
977    hmax = t[8];
978    if (edid->revision >= 4)
979        hmax += ((t[4] & 0x08) ? 255 : 0);
980    hsync = drm_mode_hsync(mode);
981
982    return (hsync <= hmax && hsync >= hmin);
983}
984
985static bool
986mode_in_vsync_range(const struct drm_display_mode *mode,
987            struct edid *edid, u8 *t)
988{
989    int vsync, vmin, vmax;
990
991    vmin = t[5];
992    if (edid->revision >= 4)
993        vmin += ((t[4] & 0x01) ? 255 : 0);
994    vmax = t[6];
995    if (edid->revision >= 4)
996        vmax += ((t[4] & 0x02) ? 255 : 0);
997    vsync = drm_mode_vrefresh(mode);
998
999    return (vsync <= vmax && vsync >= vmin);
1000}
1001
1002static u32
1003range_pixel_clock(struct edid *edid, u8 *t)
1004{
1005    /* unspecified */
1006    if (t[9] == 0 || t[9] == 255)
1007        return 0;
1008
1009    /* 1.4 with CVT support gives us real precision, yay */
1010    if (edid->revision >= 4 && t[10] == 0x04)
1011        return (t[9] * 10000) - ((t[12] >> 2) * 250);
1012
1013    /* 1.3 is pathetic, so fuzz up a bit */
1014    return t[9] * 10000 + 5001;
1015}
1016
1017static bool
1018mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1019          struct detailed_timing *timing)
1020{
1021    u32 max_clock;
1022    u8 *t = (u8 *)timing;
1023
1024    if (!mode_in_hsync_range(mode, edid, t))
1025        return false;
1026
1027    if (!mode_in_vsync_range(mode, edid, t))
1028        return false;
1029
1030    if ((max_clock = range_pixel_clock(edid, t)))
1031        if (mode->clock > max_clock)
1032            return false;
1033
1034    /* 1.4 max horizontal check */
1035    if (edid->revision >= 4 && t[10] == 0x04)
1036        if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1037            return false;
1038
1039    if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1040        return false;
1041
1042    return true;
1043}
1044
1045static bool valid_inferred_mode(const struct drm_connector *connector,
1046                const struct drm_display_mode *mode)
1047{
1048    struct drm_display_mode *m;
1049    bool ok = false;
1050
1051    list_for_each_entry(m, &connector->probed_modes, head) {
1052        if (mode->hdisplay == m->hdisplay &&
1053            mode->vdisplay == m->vdisplay &&
1054            drm_mode_vrefresh(mode) == drm_mode_vrefresh(m))
1055            return false; /* duplicated */
1056        if (mode->hdisplay <= m->hdisplay &&
1057            mode->vdisplay <= m->vdisplay)
1058            ok = true;
1059    }
1060    return ok;
1061}
1062
1063static int
1064drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1065            struct detailed_timing *timing)
1066{
1067    int i, modes = 0;
1068    struct drm_display_mode *newmode;
1069    struct drm_device *dev = connector->dev;
1070
1071    for (i = 0; i < drm_num_dmt_modes; i++) {
1072        if (mode_in_range(drm_dmt_modes + i, edid, timing) &&
1073            valid_inferred_mode(connector, drm_dmt_modes + i)) {
1074            newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1075            if (newmode) {
1076                drm_mode_probed_add(connector, newmode);
1077                modes++;
1078            }
1079        }
1080    }
1081
1082    return modes;
1083}
1084
1085/* fix up 1366x768 mode from 1368x768;
1086 * GFT/CVT can't express 1366 width which isn't dividable by 8
1087 */
1088static void fixup_mode_1366x768(struct drm_display_mode *mode)
1089{
1090    if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1091        mode->hdisplay = 1366;
1092        mode->hsync_start--;
1093        mode->hsync_end--;
1094        drm_mode_set_name(mode);
1095    }
1096}
1097
1098static int
1099drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1100            struct detailed_timing *timing)
1101{
1102    int i, modes = 0;
1103    struct drm_display_mode *newmode;
1104    struct drm_device *dev = connector->dev;
1105
1106    for (i = 0; i < num_extra_modes; i++) {
1107        const struct minimode *m = &extra_modes[i];
1108        newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1109        if (!newmode)
1110            return modes;
1111
1112        fixup_mode_1366x768(newmode);
1113        if (!mode_in_range(newmode, edid, timing) ||
1114            !valid_inferred_mode(connector, newmode)) {
1115            drm_mode_destroy(dev, newmode);
1116            continue;
1117        }
1118
1119        drm_mode_probed_add(connector, newmode);
1120        modes++;
1121    }
1122
1123    return modes;
1124}
1125
1126static int
1127drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1128            struct detailed_timing *timing)
1129{
1130    int i, modes = 0;
1131    struct drm_display_mode *newmode;
1132    struct drm_device *dev = connector->dev;
1133    bool rb = drm_monitor_supports_rb(edid);
1134
1135    for (i = 0; i < num_extra_modes; i++) {
1136        const struct minimode *m = &extra_modes[i];
1137        newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1138        if (!newmode)
1139            return modes;
1140
1141        fixup_mode_1366x768(newmode);
1142        if (!mode_in_range(newmode, edid, timing) ||
1143            !valid_inferred_mode(connector, newmode)) {
1144            drm_mode_destroy(dev, newmode);
1145            continue;
1146        }
1147
1148        drm_mode_probed_add(connector, newmode);
1149        modes++;
1150    }
1151
1152    return modes;
1153}
1154
1155static void
1156do_inferred_modes(struct detailed_timing *timing, void *c)
1157{
1158    struct detailed_mode_closure *closure = c;
1159    struct detailed_non_pixel *data = &timing->data.other_data;
1160    struct detailed_data_monitor_range *range = &data->data.range;
1161
1162    if (data->type != EDID_DETAIL_MONITOR_RANGE)
1163        return;
1164
1165    closure->modes += drm_dmt_modes_for_range(closure->connector,
1166                          closure->edid,
1167                          timing);
1168    
1169    if (!version_greater(closure->edid, 1, 1))
1170        return; /* GTF not defined yet */
1171
1172    switch (range->flags) {
1173    case 0x02: /* secondary gtf, XXX could do more */
1174    case 0x00: /* default gtf */
1175        closure->modes += drm_gtf_modes_for_range(closure->connector,
1176                              closure->edid,
1177                              timing);
1178        break;
1179    case 0x04: /* cvt, only in 1.4+ */
1180        if (!version_greater(closure->edid, 1, 3))
1181            break;
1182
1183        closure->modes += drm_cvt_modes_for_range(closure->connector,
1184                              closure->edid,
1185                              timing);
1186        break;
1187    case 0x01: /* just the ranges, no formula */
1188    default:
1189        break;
1190    }
1191}
1192
1193static int
1194add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1195{
1196    struct detailed_mode_closure closure = {
1197        connector, edid, 0, 0, 0
1198    };
1199
1200    if (version_greater(edid, 1, 0))
1201        drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1202                        &closure);
1203
1204    return closure.modes;
1205}
1206
1207static int
1208drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1209{
1210    int i, j, m, modes = 0;
1211    struct drm_display_mode *mode;
1212    u8 *est = ((u8 *)timing) + 5;
1213
1214    for (i = 0; i < 6; i++) {
1215        for (j = 7; j > 0; j--) {
1216            m = (i * 8) + (7 - j);
1217            if (m >= ARRAY_SIZE(est3_modes))
1218                break;
1219            if (est[i] & (1 << j)) {
1220                mode = drm_mode_find_dmt(connector->dev,
1221                             est3_modes[m].w,
1222                             est3_modes[m].h,
1223                             est3_modes[m].r,
1224                             est3_modes[m].rb);
1225                if (mode) {
1226                    drm_mode_probed_add(connector, mode);
1227                    modes++;
1228                }
1229            }
1230        }
1231    }
1232
1233    return modes;
1234}
1235
1236static void
1237do_established_modes(struct detailed_timing *timing, void *c)
1238{
1239    struct detailed_mode_closure *closure = c;
1240    struct detailed_non_pixel *data = &timing->data.other_data;
1241
1242    if (data->type == EDID_DETAIL_EST_TIMINGS)
1243        closure->modes += drm_est3_modes(closure->connector, timing);
1244}
1245
1246/**
1247 * add_established_modes - get est. modes from EDID and add them
1248 * @edid: EDID block to scan
1249 *
1250 * Each EDID block contains a bitmap of the supported "established modes" list
1251 * (defined above). Tease them out and add them to the global modes list.
1252 */
1253static int
1254add_established_modes(struct drm_connector *connector, struct edid *edid)
1255{
1256    struct drm_device *dev = connector->dev;
1257    unsigned long est_bits = edid->established_timings.t1 |
1258        (edid->established_timings.t2 << 8) |
1259        ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1260    int i, modes = 0;
1261    struct detailed_mode_closure closure = {
1262        connector, edid, 0, 0, 0
1263    };
1264
1265    for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1266        if (est_bits & (1<<i)) {
1267            struct drm_display_mode *newmode;
1268            newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1269            if (newmode) {
1270                drm_mode_probed_add(connector, newmode);
1271                modes++;
1272            }
1273        }
1274    }
1275
1276    if (version_greater(edid, 1, 0))
1277            drm_for_each_detailed_block((u8 *)edid,
1278                        do_established_modes, &closure);
1279
1280    return modes + closure.modes;
1281}
1282
1283static void
1284do_standard_modes(struct detailed_timing *timing, void *c)
1285{
1286    struct detailed_mode_closure *closure = c;
1287    struct detailed_non_pixel *data = &timing->data.other_data;
1288    struct drm_connector *connector = closure->connector;
1289    struct edid *edid = closure->edid;
1290
1291    if (data->type == EDID_DETAIL_STD_MODES) {
1292        int i;
1293        for (i = 0; i < 6; i++) {
1294            struct std_timing *std;
1295            struct drm_display_mode *newmode;
1296
1297            std = &data->data.timings[i];
1298            newmode = drm_mode_std(connector, edid, std,
1299                           edid->revision);
1300            if (newmode) {
1301                drm_mode_probed_add(connector, newmode);
1302                closure->modes++;
1303            }
1304        }
1305    }
1306}
1307
1308/**
1309 * add_standard_modes - get std. modes from EDID and add them
1310 * @edid: EDID block to scan
1311 *
1312 * Standard modes can be calculated using the appropriate standard (DMT,
1313 * GTF or CVT. Grab them from @edid and add them to the list.
1314 */
1315static int
1316add_standard_modes(struct drm_connector *connector, struct edid *edid)
1317{
1318    int i, modes = 0;
1319    struct detailed_mode_closure closure = {
1320        connector, edid, 0, 0, 0
1321    };
1322
1323    for (i = 0; i < EDID_STD_TIMINGS; i++) {
1324        struct drm_display_mode *newmode;
1325
1326        newmode = drm_mode_std(connector, edid,
1327                       &edid->standard_timings[i],
1328                       edid->revision);
1329        if (newmode) {
1330            drm_mode_probed_add(connector, newmode);
1331            modes++;
1332        }
1333    }
1334
1335    if (version_greater(edid, 1, 0))
1336        drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1337                        &closure);
1338
1339    /* XXX should also look for standard codes in VTB blocks */
1340
1341    return modes + closure.modes;
1342}
1343
1344static int drm_cvt_modes(struct drm_connector *connector,
1345             struct detailed_timing *timing)
1346{
1347    int i, j, modes = 0;
1348    struct drm_display_mode *newmode;
1349    struct drm_device *dev = connector->dev;
1350    struct cvt_timing *cvt;
1351    const int rates[] = { 60, 85, 75, 60, 50 };
1352    const u8 empty[3] = { 0, 0, 0 };
1353
1354    for (i = 0; i < 4; i++) {
1355        int uninitialized_var(width), height;
1356        cvt = &(timing->data.other_data.data.cvt[i]);
1357
1358        if (!memcmp(cvt->code, empty, 3))
1359            continue;
1360
1361        height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1362        switch (cvt->code[1] & 0x0c) {
1363        case 0x00:
1364            width = height * 4 / 3;
1365            break;
1366        case 0x04:
1367            width = height * 16 / 9;
1368            break;
1369        case 0x08:
1370            width = height * 16 / 10;
1371            break;
1372        case 0x0c:
1373            width = height * 15 / 9;
1374            break;
1375        }
1376
1377        for (j = 1; j < 5; j++) {
1378            if (cvt->code[2] & (1 << j)) {
1379                newmode = drm_cvt_mode(dev, width, height,
1380                               rates[j], j == 0,
1381                               false, false);
1382                if (newmode) {
1383                    drm_mode_probed_add(connector, newmode);
1384                    modes++;
1385                }
1386            }
1387        }
1388    }
1389
1390    return modes;
1391}
1392
1393static void
1394do_cvt_mode(struct detailed_timing *timing, void *c)
1395{
1396    struct detailed_mode_closure *closure = c;
1397    struct detailed_non_pixel *data = &timing->data.other_data;
1398
1399    if (data->type == EDID_DETAIL_CVT_3BYTE)
1400        closure->modes += drm_cvt_modes(closure->connector, timing);
1401}
1402
1403static int
1404add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1405{
1406    struct detailed_mode_closure closure = {
1407        connector, edid, 0, 0, 0
1408    };
1409
1410    if (version_greater(edid, 1, 2))
1411        drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1412
1413    /* XXX should also look for CVT codes in VTB blocks */
1414
1415    return closure.modes;
1416}
1417
1418static void
1419do_detailed_mode(struct detailed_timing *timing, void *c)
1420{
1421    struct detailed_mode_closure *closure = c;
1422    struct drm_display_mode *newmode;
1423
1424    if (timing->pixel_clock) {
1425        newmode = drm_mode_detailed(closure->connector->dev,
1426                        closure->edid, timing,
1427                        closure->quirks);
1428        if (!newmode)
1429            return;
1430
1431        if (closure->preferred)
1432            newmode->type |= DRM_MODE_TYPE_PREFERRED;
1433
1434        drm_mode_probed_add(closure->connector, newmode);
1435        closure->modes++;
1436        closure->preferred = 0;
1437    }
1438}
1439
1440/*
1441 * add_detailed_modes - Add modes from detailed timings
1442 * @connector: attached connector
1443 * @edid: EDID block to scan
1444 * @quirks: quirks to apply
1445 */
1446static int
1447add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1448           u32 quirks)
1449{
1450    struct detailed_mode_closure closure = {
1451        connector,
1452        edid,
1453        1,
1454        quirks,
1455        0
1456    };
1457
1458    if (closure.preferred && !version_greater(edid, 1, 3))
1459        closure.preferred =
1460            (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1461
1462    drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1463
1464    return closure.modes;
1465}
1466
1467#define HDMI_IDENTIFIER 0x000C03
1468#define AUDIO_BLOCK 0x01
1469#define VIDEO_BLOCK 0x02
1470#define VENDOR_BLOCK 0x03
1471#define SPEAKER_BLOCK 0x04
1472#define EDID_BASIC_AUDIO (1 << 6)
1473#define EDID_CEA_YCRCB444 (1 << 5)
1474#define EDID_CEA_YCRCB422 (1 << 4)
1475
1476/**
1477 * Search EDID for CEA extension block.
1478 */
1479u8 *drm_find_cea_extension(struct edid *edid)
1480{
1481    u8 *edid_ext = NULL;
1482    int i;
1483
1484    /* No EDID or EDID extensions */
1485    if (edid == NULL || edid->extensions == 0)
1486        return NULL;
1487
1488    /* Find CEA extension */
1489    for (i = 0; i < edid->extensions; i++) {
1490        edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1491        if (edid_ext[0] == CEA_EXT)
1492            break;
1493    }
1494
1495    if (i == edid->extensions)
1496        return NULL;
1497
1498    return edid_ext;
1499}
1500EXPORT_SYMBOL(drm_find_cea_extension);
1501
1502static int
1503do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1504{
1505    struct drm_device *dev = connector->dev;
1506    u8 * mode, cea_mode;
1507    int modes = 0;
1508
1509    for (mode = db; mode < db + len; mode++) {
1510        cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1511        if (cea_mode < drm_num_cea_modes) {
1512            struct drm_display_mode *newmode;
1513            newmode = drm_mode_duplicate(dev,
1514                             &edid_cea_modes[cea_mode]);
1515            if (newmode) {
1516                drm_mode_probed_add(connector, newmode);
1517                modes++;
1518            }
1519        }
1520    }
1521
1522    return modes;
1523}
1524
1525static int
1526add_cea_modes(struct drm_connector *connector, struct edid *edid)
1527{
1528    u8 * cea = drm_find_cea_extension(edid);
1529    u8 * db, dbl;
1530    int modes = 0;
1531
1532    if (cea && cea[1] >= 3) {
1533        for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1534            dbl = db[0] & 0x1f;
1535            if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK)
1536                modes += do_cea_modes (connector, db+1, dbl);
1537        }
1538    }
1539
1540    return modes;
1541}
1542
1543static void
1544parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db)
1545{
1546    connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1547
1548    connector->dvi_dual = db[6] & 1;
1549    connector->max_tmds_clock = db[7] * 5;
1550
1551    connector->latency_present[0] = db[8] >> 7;
1552    connector->latency_present[1] = (db[8] >> 6) & 1;
1553    connector->video_latency[0] = db[9];
1554    connector->audio_latency[0] = db[10];
1555    connector->video_latency[1] = db[11];
1556    connector->audio_latency[1] = db[12];
1557
1558    DRM_LOG_KMS("HDMI: DVI dual %d, "
1559            "max TMDS clock %d, "
1560            "latency present %d %d, "
1561            "video latency %d %d, "
1562            "audio latency %d %d\n",
1563            connector->dvi_dual,
1564            connector->max_tmds_clock,
1565          (int) connector->latency_present[0],
1566          (int) connector->latency_present[1],
1567            connector->video_latency[0],
1568            connector->video_latency[1],
1569            connector->audio_latency[0],
1570            connector->audio_latency[1]);
1571}
1572
1573static void
1574monitor_name(struct detailed_timing *t, void *data)
1575{
1576    if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1577        *(u8 **)data = t->data.other_data.data.str.str;
1578}
1579
1580/**
1581 * drm_edid_to_eld - build ELD from EDID
1582 * @connector: connector corresponding to the HDMI/DP sink
1583 * @edid: EDID to parse
1584 *
1585 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1586 * Some ELD fields are left to the graphics driver caller:
1587 * - Conn_Type
1588 * - HDCP
1589 * - Port_ID
1590 */
1591void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1592{
1593    uint8_t *eld = connector->eld;
1594    u8 *cea;
1595    u8 *name;
1596    u8 *db;
1597    int sad_count = 0;
1598    int mnl;
1599    int dbl;
1600
1601    memset(eld, 0, sizeof(connector->eld));
1602
1603    cea = drm_find_cea_extension(edid);
1604    if (!cea) {
1605        DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1606        return;
1607    }
1608
1609    name = NULL;
1610    drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1611    for (mnl = 0; name && mnl < 13; mnl++) {
1612        if (name[mnl] == 0x0a)
1613            break;
1614        eld[20 + mnl] = name[mnl];
1615    }
1616    eld[4] = (cea[1] << 5) | mnl;
1617    DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1618
1619    eld[0] = 2 << 3; /* ELD version: 2 */
1620
1621    eld[16] = edid->mfg_id[0];
1622    eld[17] = edid->mfg_id[1];
1623    eld[18] = edid->prod_code[0];
1624    eld[19] = edid->prod_code[1];
1625
1626    if (cea[1] >= 3)
1627        for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1628            dbl = db[0] & 0x1f;
1629            
1630            switch ((db[0] & 0xe0) >> 5) {
1631            case AUDIO_BLOCK:
1632                /* Audio Data Block, contains SADs */
1633                sad_count = dbl / 3;
1634                memcpy(eld + 20 + mnl, &db[1], dbl);
1635                break;
1636            case SPEAKER_BLOCK:
1637                                /* Speaker Allocation Data Block */
1638                eld[7] = db[1];
1639                break;
1640            case VENDOR_BLOCK:
1641                /* HDMI Vendor-Specific Data Block */
1642                if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0)
1643                    parse_hdmi_vsdb(connector, db);
1644                break;
1645            default:
1646                break;
1647            }
1648        }
1649    eld[5] |= sad_count << 4;
1650    eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1651
1652    DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1653}
1654EXPORT_SYMBOL(drm_edid_to_eld);
1655
1656/**
1657 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1658 * @connector: connector associated with the HDMI/DP sink
1659 * @mode: the display mode
1660 */
1661int drm_av_sync_delay(struct drm_connector *connector,
1662              struct drm_display_mode *mode)
1663{
1664    int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1665    int a, v;
1666
1667    if (!connector->latency_present[0])
1668        return 0;
1669    if (!connector->latency_present[1])
1670        i = 0;
1671
1672    a = connector->audio_latency[i];
1673    v = connector->video_latency[i];
1674
1675    /*
1676     * HDMI/DP sink doesn't support audio or video?
1677     */
1678    if (a == 255 || v == 255)
1679        return 0;
1680
1681    /*
1682     * Convert raw EDID values to millisecond.
1683     * Treat unknown latency as 0ms.
1684     */
1685    if (a)
1686        a = min(2 * (a - 1), 500);
1687    if (v)
1688        v = min(2 * (v - 1), 500);
1689
1690    return max(v - a, 0);
1691}
1692EXPORT_SYMBOL(drm_av_sync_delay);
1693
1694/**
1695 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1696 * @encoder: the encoder just changed display mode
1697 * @mode: the adjusted display mode
1698 *
1699 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1700 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1701 */
1702struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1703                     struct drm_display_mode *mode)
1704{
1705    struct drm_connector *connector;
1706    struct drm_device *dev = encoder->dev;
1707
1708    list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1709        if (connector->encoder == encoder && connector->eld[0])
1710            return connector;
1711
1712    return NULL;
1713}
1714EXPORT_SYMBOL(drm_select_eld);
1715
1716/**
1717 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1718 * @edid: monitor EDID information
1719 *
1720 * Parse the CEA extension according to CEA-861-B.
1721 * Return true if HDMI, false if not or unknown.
1722 */
1723bool drm_detect_hdmi_monitor(struct edid *edid)
1724{
1725    u8 *edid_ext;
1726    int i, hdmi_id;
1727    int start_offset, end_offset;
1728    bool is_hdmi = false;
1729
1730    edid_ext = drm_find_cea_extension(edid);
1731    if (!edid_ext)
1732        goto end;
1733
1734    /* Data block offset in CEA extension block */
1735    start_offset = 4;
1736    end_offset = edid_ext[2];
1737
1738    /*
1739     * Because HDMI identifier is in Vendor Specific Block,
1740     * search it from all data blocks of CEA extension.
1741     */
1742    for (i = start_offset; i < end_offset;
1743        /* Increased by data block len */
1744        i += ((edid_ext[i] & 0x1f) + 1)) {
1745        /* Find vendor specific block */
1746        if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1747            hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1748                  edid_ext[i + 3] << 16;
1749            /* Find HDMI identifier */
1750            if (hdmi_id == HDMI_IDENTIFIER)
1751                is_hdmi = true;
1752            break;
1753        }
1754    }
1755
1756end:
1757    return is_hdmi;
1758}
1759EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1760
1761/**
1762 * drm_detect_monitor_audio - check monitor audio capability
1763 *
1764 * Monitor should have CEA extension block.
1765 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1766 * audio' only. If there is any audio extension block and supported
1767 * audio format, assume at least 'basic audio' support, even if 'basic
1768 * audio' is not defined in EDID.
1769 *
1770 */
1771bool drm_detect_monitor_audio(struct edid *edid)
1772{
1773    u8 *edid_ext;
1774    int i, j;
1775    bool has_audio = false;
1776    int start_offset, end_offset;
1777
1778    edid_ext = drm_find_cea_extension(edid);
1779    if (!edid_ext)
1780        goto end;
1781
1782    has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1783
1784    if (has_audio) {
1785        DRM_DEBUG_KMS("Monitor has basic audio support\n");
1786        goto end;
1787    }
1788
1789    /* Data block offset in CEA extension block */
1790    start_offset = 4;
1791    end_offset = edid_ext[2];
1792
1793    for (i = start_offset; i < end_offset;
1794            i += ((edid_ext[i] & 0x1f) + 1)) {
1795        if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1796            has_audio = true;
1797            for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1798                DRM_DEBUG_KMS("CEA audio format %d\n",
1799                          (edid_ext[i + j] >> 3) & 0xf);
1800            goto end;
1801        }
1802    }
1803end:
1804    return has_audio;
1805}
1806EXPORT_SYMBOL(drm_detect_monitor_audio);
1807
1808/**
1809 * drm_add_display_info - pull display info out if present
1810 * @edid: EDID data
1811 * @info: display info (attached to connector)
1812 *
1813 * Grab any available display info and stuff it into the drm_display_info
1814 * structure that's part of the connector. Useful for tracking bpp and
1815 * color spaces.
1816 */
1817static void drm_add_display_info(struct edid *edid,
1818                 struct drm_display_info *info)
1819{
1820    u8 *edid_ext;
1821
1822    info->width_mm = edid->width_cm * 10;
1823    info->height_mm = edid->height_cm * 10;
1824
1825    /* driver figures it out in this case */
1826    info->bpc = 0;
1827    info->color_formats = 0;
1828
1829    if (edid->revision < 3)
1830        return;
1831
1832    if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1833        return;
1834
1835    /* Get data from CEA blocks if present */
1836    edid_ext = drm_find_cea_extension(edid);
1837    if (edid_ext) {
1838        info->cea_rev = edid_ext[1];
1839
1840        /* The existence of a CEA block should imply RGB support */
1841        info->color_formats = DRM_COLOR_FORMAT_RGB444;
1842        if (edid_ext[3] & EDID_CEA_YCRCB444)
1843            info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1844        if (edid_ext[3] & EDID_CEA_YCRCB422)
1845            info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1846    }
1847
1848    /* Only defined for 1.4 with digital displays */
1849    if (edid->revision < 4)
1850        return;
1851
1852    switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1853    case DRM_EDID_DIGITAL_DEPTH_6:
1854        info->bpc = 6;
1855        break;
1856    case DRM_EDID_DIGITAL_DEPTH_8:
1857        info->bpc = 8;
1858        break;
1859    case DRM_EDID_DIGITAL_DEPTH_10:
1860        info->bpc = 10;
1861        break;
1862    case DRM_EDID_DIGITAL_DEPTH_12:
1863        info->bpc = 12;
1864        break;
1865    case DRM_EDID_DIGITAL_DEPTH_14:
1866        info->bpc = 14;
1867        break;
1868    case DRM_EDID_DIGITAL_DEPTH_16:
1869        info->bpc = 16;
1870        break;
1871    case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1872    default:
1873        info->bpc = 0;
1874        break;
1875    }
1876
1877    info->color_formats |= DRM_COLOR_FORMAT_RGB444;
1878    if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
1879        info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1880    if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
1881        info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1882}
1883
1884/**
1885 * drm_add_edid_modes - add modes from EDID data, if available
1886 * @connector: connector we're probing
1887 * @edid: edid data
1888 *
1889 * Add the specified modes to the connector's mode list.
1890 *
1891 * Return number of modes added or 0 if we couldn't find any.
1892 */
1893int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1894{
1895    int num_modes = 0;
1896    u32 quirks;
1897
1898    if (edid == NULL) {
1899        return 0;
1900    }
1901    if (!drm_edid_is_valid(edid)) {
1902        dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1903             drm_get_connector_name(connector));
1904        return 0;
1905    }
1906
1907    quirks = edid_get_quirks(edid);
1908
1909    /*
1910     * EDID spec says modes should be preferred in this order:
1911     * - preferred detailed mode
1912     * - other detailed modes from base block
1913     * - detailed modes from extension blocks
1914     * - CVT 3-byte code modes
1915     * - standard timing codes
1916     * - established timing codes
1917     * - modes inferred from GTF or CVT range information
1918     *
1919     * We get this pretty much right.
1920     *
1921     * XXX order for additional mode types in extension blocks?
1922     */
1923    num_modes += add_detailed_modes(connector, edid, quirks);
1924    num_modes += add_cvt_modes(connector, edid);
1925    num_modes += add_standard_modes(connector, edid);
1926    num_modes += add_established_modes(connector, edid);
1927    num_modes += add_inferred_modes(connector, edid);
1928    num_modes += add_cea_modes(connector, edid);
1929
1930    if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1931        edid_fixup_preferred(connector, quirks);
1932
1933    drm_add_display_info(edid, &connector->display_info);
1934
1935    return num_modes;
1936}
1937EXPORT_SYMBOL(drm_add_edid_modes);
1938
1939/**
1940 * drm_add_modes_noedid - add modes for the connectors without EDID
1941 * @connector: connector we're probing
1942 * @hdisplay: the horizontal display limit
1943 * @vdisplay: the vertical display limit
1944 *
1945 * Add the specified modes to the connector's mode list. Only when the
1946 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1947 *
1948 * Return number of modes added or 0 if we couldn't find any.
1949 */
1950int drm_add_modes_noedid(struct drm_connector *connector,
1951            int hdisplay, int vdisplay)
1952{
1953    int i, count, num_modes = 0;
1954    struct drm_display_mode *mode;
1955    struct drm_device *dev = connector->dev;
1956
1957    count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1958    if (hdisplay < 0)
1959        hdisplay = 0;
1960    if (vdisplay < 0)
1961        vdisplay = 0;
1962
1963    for (i = 0; i < count; i++) {
1964        const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1965        if (hdisplay && vdisplay) {
1966            /*
1967             * Only when two are valid, they will be used to check
1968             * whether the mode should be added to the mode list of
1969             * the connector.
1970             */
1971            if (ptr->hdisplay > hdisplay ||
1972                    ptr->vdisplay > vdisplay)
1973                continue;
1974        }
1975        if (drm_mode_vrefresh(ptr) > 61)
1976            continue;
1977        mode = drm_mode_duplicate(dev, ptr);
1978        if (mode) {
1979            drm_mode_probed_add(connector, mode);
1980            num_modes++;
1981        }
1982    }
1983    return num_modes;
1984}
1985EXPORT_SYMBOL(drm_add_modes_noedid);
1986

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