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.
7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
9 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
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:
18 * The above copyright notice and this permission notice (including the
19 * next paragraph) shall be included in all copies or substantial portions
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.
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/i2c.h>
33 #include <linux/module.h>
36 #include "drm_edid_modes.h"
38 #define version_greater(edid, maj, min) \
39 (((edid)->version > (maj)) || \
40 ((edid)->version == (maj) && (edid)->revision > (min)))
42 #define EDID_EST_TIMINGS 16
43 #define EDID_STD_TIMINGS 8
44 #define EDID_DETAILED_TIMINGS 4
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).
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.
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)
72 struct detailed_mode_closure
{
73 struct drm_connector
*connector
;
85 static struct edid_quirk
{
89 } edid_quirk_list
[] = {
91 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60
},
93 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60
},
95 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
97 /* Belinea 10 15 55 */
98 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60
},
99 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60
},
101 /* Envision Peripherals, Inc. EN-7100e */
102 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH
},
103 /* Envision EN2028 */
104 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60
},
106 /* Funai Electronics PM36B */
107 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75
|
108 EDID_QUIRK_DETAILED_IN_CM
},
110 /* LG Philips LCD LP154W01-A5 */
111 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
112 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
114 /* Philips 107p5 CRT */
115 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
118 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
120 /* Samsung SyncMaster 205BW. Note: irony */
121 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP
},
122 /* Samsung SyncMaster 22[5-6]BW */
123 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60
},
124 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60
},
126 /* ViewSonic VA2026w */
127 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING
},
130 /*** DDC fetch and block validation ***/
132 static const u8 edid_header
[] = {
133 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
137 * Sanity check the header of the base EDID block. Return 8 if the header
138 * is perfect, down to 0 if it's totally wrong.
140 int drm_edid_header_is_valid(const u8
*raw_edid
)
144 for (i
= 0; i
< sizeof(edid_header
); i
++)
145 if (raw_edid
[i
] == edid_header
[i
])
150 EXPORT_SYMBOL(drm_edid_header_is_valid
);
152 static int edid_fixup __read_mostly
= 6;
153 module_param_named(edid_fixup
, edid_fixup
, int, 0400);
154 MODULE_PARM_DESC(edid_fixup
,
155 "Minimum number of valid EDID header bytes (0-8, default 6)");
158 * Sanity check the EDID block (base or extension). Return 0 if the block
159 * doesn't check out, or 1 if it's valid.
161 bool drm_edid_block_valid(u8
*raw_edid
, int block
)
165 struct edid
*edid
= (struct edid
*)raw_edid
;
167 if (edid_fixup
> 8 || edid_fixup
< 0)
171 int score
= drm_edid_header_is_valid(raw_edid
);
173 else if (score
>= edid_fixup
) {
174 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
175 memcpy(raw_edid
, edid_header
, sizeof(edid_header
));
181 for (i
= 0; i
< EDID_LENGTH
; i
++)
184 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum
);
186 /* allow CEA to slide through, switches mangle this */
187 if (raw_edid
[0] != 0x02)
191 /* per-block-type checks */
192 switch (raw_edid
[0]) {
194 if (edid
->version
!= 1) {
195 DRM_ERROR("EDID has major version %d, instead of 1\n", edid
->version
);
199 if (edid
->revision
> 4)
200 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
211 printk(KERN_ERR
"Raw EDID:\n");
212 print_hex_dump(KERN_ERR
, " \t", DUMP_PREFIX_NONE
, 16, 1,
213 raw_edid
, EDID_LENGTH
, false);
217 EXPORT_SYMBOL(drm_edid_block_valid
);
220 * drm_edid_is_valid - sanity check EDID data
223 * Sanity-check an entire EDID record (including extensions)
225 bool drm_edid_is_valid(struct edid
*edid
)
228 u8
*raw
= (u8
*)edid
;
233 for (i
= 0; i
<= edid
->extensions
; i
++)
234 if (!drm_edid_block_valid(raw
+ i
* EDID_LENGTH
, i
))
239 EXPORT_SYMBOL(drm_edid_is_valid
);
241 #define DDC_SEGMENT_ADDR 0x30
243 * Get EDID information via I2C.
245 * \param adapter : i2c device adaptor
246 * \param buf : EDID data buffer to be filled
247 * \param len : EDID data buffer length
248 * \return 0 on success or -1 on failure.
250 * Try to fetch EDID information by calling i2c driver function.
253 drm_do_probe_ddc_edid(struct i2c_adapter
*adapter
, unsigned char *buf
,
256 unsigned char start
= block
* EDID_LENGTH
;
257 int ret
, retries
= 5;
259 /* The core i2c driver will automatically retry the transfer if the
260 * adapter reports EAGAIN. However, we find that bit-banging transfers
261 * are susceptible to errors under a heavily loaded machine and
262 * generate spurious NAKs and timeouts. Retrying the transfer
263 * of the individual block a few times seems to overcome this.
266 struct i2c_msg msgs
[] = {
279 ret
= i2c_transfer(adapter
, msgs
, 2);
281 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
285 } while (ret
!= 2 && --retries
);
287 return ret
== 2 ? 0 : -1;
290 static bool drm_edid_is_zero(u8
*in_edid
, int length
)
293 u32
*raw_edid
= (u32
*)in_edid
;
295 for (i
= 0; i
< length
/ 4; i
++)
296 if (*(raw_edid
+ i
) != 0)
302 drm_do_get_edid(struct drm_connector
*connector
, struct i2c_adapter
*adapter
)
304 int i
, j
= 0, valid_extensions
= 0;
307 if ((block
= kmalloc(EDID_LENGTH
, GFP_KERNEL
)) == NULL
)
310 /* base block fetch */
311 for (i
= 0; i
< 4; i
++) {
312 if (drm_do_probe_ddc_edid(adapter
, block
, 0, EDID_LENGTH
))
314 if (drm_edid_block_valid(block
, 0))
316 if (i
== 0 && drm_edid_is_zero(block
, EDID_LENGTH
)) {
317 connector
->null_edid_counter
++;
324 /* if there's no extensions, we're done */
325 if (block
[0x7e] == 0)
328 new = krealloc(block
, (block
[0x7e] + 1) * EDID_LENGTH
, GFP_KERNEL
);
333 for (j
= 1; j
<= block
[0x7e]; j
++) {
334 for (i
= 0; i
< 4; i
++) {
335 if (drm_do_probe_ddc_edid(adapter
,
336 block
+ (valid_extensions
+ 1) * EDID_LENGTH
,
339 if (drm_edid_block_valid(block
+ (valid_extensions
+ 1) * EDID_LENGTH
, j
)) {
345 dev_warn(connector
->dev
->dev
,
346 "%s: Ignoring invalid EDID block %d.\n",
347 drm_get_connector_name(connector
), j
);
350 if (valid_extensions
!= block
[0x7e]) {
351 block
[EDID_LENGTH
-1] += block
[0x7e] - valid_extensions
;
352 block
[0x7e] = valid_extensions
;
353 new = krealloc(block
, (valid_extensions
+ 1) * EDID_LENGTH
, GFP_KERNEL
);
362 dev_warn(connector
->dev
->dev
, "%s: EDID block %d invalid.\n",
363 drm_get_connector_name(connector
), j
);
371 * Probe DDC presence.
373 * \param adapter : i2c device adaptor
374 * \return 1 on success
377 drm_probe_ddc(struct i2c_adapter
*adapter
)
381 return (drm_do_probe_ddc_edid(adapter
, &out
, 0, 1) == 0);
385 * drm_get_edid - get EDID data, if available
386 * @connector: connector we're probing
387 * @adapter: i2c adapter to use for DDC
389 * Poke the given i2c channel to grab EDID data if possible. If found,
390 * attach it to the connector.
392 * Return edid data or NULL if we couldn't find any.
394 struct edid
*drm_get_edid(struct drm_connector
*connector
,
395 struct i2c_adapter
*adapter
)
397 struct edid
*edid
= NULL
;
399 if (drm_probe_ddc(adapter
))
400 edid
= (struct edid
*)drm_do_get_edid(connector
, adapter
);
402 connector
->display_info
.raw_edid
= (char *)edid
;
407 EXPORT_SYMBOL(drm_get_edid
);
409 /*** EDID parsing ***/
412 * edid_vendor - match a string against EDID's obfuscated vendor field
413 * @edid: EDID to match
414 * @vendor: vendor string
416 * Returns true if @vendor is in @edid, false otherwise
418 static bool edid_vendor(struct edid
*edid
, char *vendor
)
422 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
423 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
424 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
425 edid_vendor
[2] = (edid
->mfg_id
[1] & 0x1f) + '@';
427 return !strncmp(edid_vendor
, vendor
, 3);
431 * edid_get_quirks - return quirk flags for a given EDID
432 * @edid: EDID to process
434 * This tells subsequent routines what fixes they need to apply.
436 static u32
edid_get_quirks(struct edid
*edid
)
438 struct edid_quirk
*quirk
;
441 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
442 quirk
= &edid_quirk_list
[i
];
444 if (edid_vendor(edid
, quirk
->vendor
) &&
445 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
446 return quirk
->quirks
;
452 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
453 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
456 * edid_fixup_preferred - set preferred modes based on quirk list
457 * @connector: has mode list to fix up
458 * @quirks: quirks list
460 * Walk the mode list for @connector, clearing the preferred status
461 * on existing modes and setting it anew for the right mode ala @quirks.
463 static void edid_fixup_preferred(struct drm_connector
*connector
,
466 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
467 int target_refresh
= 0;
469 if (list_empty(&connector
->probed_modes
))
472 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
474 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
477 preferred_mode
= list_first_entry(&connector
->probed_modes
,
478 struct drm_display_mode
, head
);
480 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
481 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
483 if (cur_mode
== preferred_mode
)
486 /* Largest mode is preferred */
487 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
488 preferred_mode
= cur_mode
;
490 /* At a given size, try to get closest to target refresh */
491 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
492 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
493 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
494 preferred_mode
= cur_mode
;
498 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
502 mode_is_rb(const struct drm_display_mode
*mode
)
504 return (mode
->htotal
- mode
->hdisplay
== 160) &&
505 (mode
->hsync_end
- mode
->hdisplay
== 80) &&
506 (mode
->hsync_end
- mode
->hsync_start
== 32) &&
507 (mode
->vsync_start
- mode
->vdisplay
== 3);
511 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
512 * @dev: Device to duplicate against
514 * @vsize: Mode height
515 * @fresh: Mode refresh rate
516 * @rb: Mode reduced-blanking-ness
518 * Walk the DMT mode list looking for a match for the given parameters.
519 * Return a newly allocated copy of the mode, or NULL if not found.
521 struct drm_display_mode
*drm_mode_find_dmt(struct drm_device
*dev
,
522 int hsize
, int vsize
, int fresh
,
527 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
528 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
529 if (hsize
!= ptr
->hdisplay
)
531 if (vsize
!= ptr
->vdisplay
)
533 if (fresh
!= drm_mode_vrefresh(ptr
))
535 if (rb
!= mode_is_rb(ptr
))
538 return drm_mode_duplicate(dev
, ptr
);
543 EXPORT_SYMBOL(drm_mode_find_dmt
);
545 typedef void detailed_cb(struct detailed_timing
*timing
, void *closure
);
548 cea_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
552 u8
*det_base
= ext
+ d
;
555 for (i
= 0; i
< n
; i
++)
556 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
560 vtb_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
562 unsigned int i
, n
= min((int)ext
[0x02], 6);
563 u8
*det_base
= ext
+ 5;
566 return; /* unknown version */
568 for (i
= 0; i
< n
; i
++)
569 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
573 drm_for_each_detailed_block(u8
*raw_edid
, detailed_cb
*cb
, void *closure
)
576 struct edid
*edid
= (struct edid
*)raw_edid
;
581 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++)
582 cb(&(edid
->detailed_timings
[i
]), closure
);
584 for (i
= 1; i
<= raw_edid
[0x7e]; i
++) {
585 u8
*ext
= raw_edid
+ (i
* EDID_LENGTH
);
588 cea_for_each_detailed_block(ext
, cb
, closure
);
591 vtb_for_each_detailed_block(ext
, cb
, closure
);
600 is_rb(struct detailed_timing
*t
, void *data
)
603 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
)
605 *(bool *)data
= true;
608 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
610 drm_monitor_supports_rb(struct edid
*edid
)
612 if (edid
->revision
>= 4) {
614 drm_for_each_detailed_block((u8
*)edid
, is_rb
, &ret
);
618 return ((edid
->input
& DRM_EDID_INPUT_DIGITAL
) != 0);
622 find_gtf2(struct detailed_timing
*t
, void *data
)
625 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
&& r
[10] == 0x02)
629 /* Secondary GTF curve kicks in above some break frequency */
631 drm_gtf2_hbreak(struct edid
*edid
)
634 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
635 return r
? (r
[12] * 2) : 0;
639 drm_gtf2_2c(struct edid
*edid
)
642 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
643 return r
? r
[13] : 0;
647 drm_gtf2_m(struct edid
*edid
)
650 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
651 return r
? (r
[15] << 8) + r
[14] : 0;
655 drm_gtf2_k(struct edid
*edid
)
658 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
659 return r
? r
[16] : 0;
663 drm_gtf2_2j(struct edid
*edid
)
666 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
667 return r
? r
[17] : 0;
671 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
672 * @edid: EDID block to scan
674 static int standard_timing_level(struct edid
*edid
)
676 if (edid
->revision
>= 2) {
677 if (edid
->revision
>= 4 && (edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
))
679 if (drm_gtf2_hbreak(edid
))
687 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
688 * monitors fill with ascii space (0x20) instead.
691 bad_std_timing(u8 a
, u8 b
)
693 return (a
== 0x00 && b
== 0x00) ||
694 (a
== 0x01 && b
== 0x01) ||
695 (a
== 0x20 && b
== 0x20);
699 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
700 * @t: standard timing params
701 * @timing_level: standard timing level
703 * Take the standard timing params (in this case width, aspect, and refresh)
704 * and convert them into a real mode using CVT/GTF/DMT.
706 static struct drm_display_mode
*
707 drm_mode_std(struct drm_connector
*connector
, struct edid
*edid
,
708 struct std_timing
*t
, int revision
)
710 struct drm_device
*dev
= connector
->dev
;
711 struct drm_display_mode
*m
, *mode
= NULL
;
714 unsigned aspect_ratio
= (t
->vfreq_aspect
& EDID_TIMING_ASPECT_MASK
)
715 >> EDID_TIMING_ASPECT_SHIFT
;
716 unsigned vfreq
= (t
->vfreq_aspect
& EDID_TIMING_VFREQ_MASK
)
717 >> EDID_TIMING_VFREQ_SHIFT
;
718 int timing_level
= standard_timing_level(edid
);
720 if (bad_std_timing(t
->hsize
, t
->vfreq_aspect
))
723 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
724 hsize
= t
->hsize
* 8 + 248;
725 /* vrefresh_rate = vfreq + 60 */
726 vrefresh_rate
= vfreq
+ 60;
727 /* the vdisplay is calculated based on the aspect ratio */
728 if (aspect_ratio
== 0) {
732 vsize
= (hsize
* 10) / 16;
733 } else if (aspect_ratio
== 1)
734 vsize
= (hsize
* 3) / 4;
735 else if (aspect_ratio
== 2)
736 vsize
= (hsize
* 4) / 5;
738 vsize
= (hsize
* 9) / 16;
740 /* HDTV hack, part 1 */
741 if (vrefresh_rate
== 60 &&
742 ((hsize
== 1360 && vsize
== 765) ||
743 (hsize
== 1368 && vsize
== 769))) {
749 * If this connector already has a mode for this size and refresh
750 * rate (because it came from detailed or CVT info), use that
751 * instead. This way we don't have to guess at interlace or
754 list_for_each_entry(m
, &connector
->probed_modes
, head
)
755 if (m
->hdisplay
== hsize
&& m
->vdisplay
== vsize
&&
756 drm_mode_vrefresh(m
) == vrefresh_rate
)
759 /* HDTV hack, part 2 */
760 if (hsize
== 1366 && vsize
== 768 && vrefresh_rate
== 60) {
761 mode
= drm_cvt_mode(dev
, 1366, 768, vrefresh_rate
, 0, 0,
763 mode
->hdisplay
= 1366;
764 mode
->hsync_start
= mode
->hsync_start
- 1;
765 mode
->hsync_end
= mode
->hsync_end
- 1;
769 /* check whether it can be found in default mode table */
770 if (drm_monitor_supports_rb(edid
)) {
771 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
,
776 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
, false);
780 /* okay, generate it */
781 switch (timing_level
) {
785 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
789 * This is potentially wrong if there's ever a monitor with
790 * more than one ranges section, each claiming a different
791 * secondary GTF curve. Please don't do that.
793 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
796 if (drm_mode_hsync(mode
) > drm_gtf2_hbreak(edid
)) {
797 drm_mode_destroy(dev
, mode
);
798 mode
= drm_gtf_mode_complex(dev
, hsize
, vsize
,
807 mode
= drm_cvt_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0,
815 * EDID is delightfully ambiguous about how interlaced modes are to be
816 * encoded. Our internal representation is of frame height, but some
817 * HDTV detailed timings are encoded as field height.
819 * The format list here is from CEA, in frame size. Technically we
820 * should be checking refresh rate too. Whatever.
823 drm_mode_do_interlace_quirk(struct drm_display_mode
*mode
,
824 struct detailed_pixel_timing
*pt
)
827 static const struct {
829 } cea_interlaced
[] = {
839 if (!(pt
->misc
& DRM_EDID_PT_INTERLACED
))
842 for (i
= 0; i
< ARRAY_SIZE(cea_interlaced
); i
++) {
843 if ((mode
->hdisplay
== cea_interlaced
[i
].w
) &&
844 (mode
->vdisplay
== cea_interlaced
[i
].h
/ 2)) {
846 mode
->vsync_start
*= 2;
847 mode
->vsync_end
*= 2;
853 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
857 * drm_mode_detailed - create a new mode from an EDID detailed timing section
858 * @dev: DRM device (needed to create new mode)
860 * @timing: EDID detailed timing info
861 * @quirks: quirks to apply
863 * An EDID detailed timing block contains enough info for us to create and
864 * return a new struct drm_display_mode.
866 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
868 struct detailed_timing
*timing
,
871 struct drm_display_mode
*mode
;
872 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
873 unsigned hactive
= (pt
->hactive_hblank_hi
& 0xf0) << 4 | pt
->hactive_lo
;
874 unsigned vactive
= (pt
->vactive_vblank_hi
& 0xf0) << 4 | pt
->vactive_lo
;
875 unsigned hblank
= (pt
->hactive_hblank_hi
& 0xf) << 8 | pt
->hblank_lo
;
876 unsigned vblank
= (pt
->vactive_vblank_hi
& 0xf) << 8 | pt
->vblank_lo
;
877 unsigned hsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc0) << 2 | pt
->hsync_offset_lo
;
878 unsigned hsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x30) << 4 | pt
->hsync_pulse_width_lo
;
879 unsigned vsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc) >> 2 | pt
->vsync_offset_pulse_width_lo
>> 4;
880 unsigned vsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x3) << 4 | (pt
->vsync_offset_pulse_width_lo
& 0xf);
882 /* ignore tiny modes */
883 if (hactive
< 64 || vactive
< 64)
886 if (pt
->misc
& DRM_EDID_PT_STEREO
) {
887 printk(KERN_WARNING
"stereo mode not supported\n");
890 if (!(pt
->misc
& DRM_EDID_PT_SEPARATE_SYNC
)) {
891 printk(KERN_WARNING
"composite sync not supported\n");
894 /* it is incorrect if hsync/vsync width is zero */
895 if (!hsync_pulse_width
|| !vsync_pulse_width
) {
896 DRM_DEBUG_KMS("Incorrect Detailed timing. "
897 "Wrong Hsync/Vsync pulse width\n");
901 if (quirks
& EDID_QUIRK_FORCE_REDUCED_BLANKING
) {
902 mode
= drm_cvt_mode(dev
, hactive
, vactive
, 60, true, false, false);
909 mode
= drm_mode_create(dev
);
913 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
914 timing
->pixel_clock
= cpu_to_le16(1088);
916 mode
->clock
= le16_to_cpu(timing
->pixel_clock
) * 10;
918 mode
->hdisplay
= hactive
;
919 mode
->hsync_start
= mode
->hdisplay
+ hsync_offset
;
920 mode
->hsync_end
= mode
->hsync_start
+ hsync_pulse_width
;
921 mode
->htotal
= mode
->hdisplay
+ hblank
;
923 mode
->vdisplay
= vactive
;
924 mode
->vsync_start
= mode
->vdisplay
+ vsync_offset
;
925 mode
->vsync_end
= mode
->vsync_start
+ vsync_pulse_width
;
926 mode
->vtotal
= mode
->vdisplay
+ vblank
;
928 /* Some EDIDs have bogus h/vtotal values */
929 if (mode
->hsync_end
> mode
->htotal
)
930 mode
->htotal
= mode
->hsync_end
+ 1;
931 if (mode
->vsync_end
> mode
->vtotal
)
932 mode
->vtotal
= mode
->vsync_end
+ 1;
934 drm_mode_do_interlace_quirk(mode
, pt
);
936 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
937 pt
->misc
|= DRM_EDID_PT_HSYNC_POSITIVE
| DRM_EDID_PT_VSYNC_POSITIVE
;
940 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_HSYNC_POSITIVE
) ?
941 DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
942 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_VSYNC_POSITIVE
) ?
943 DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
946 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_height_mm_hi
& 0xf0) << 4;
947 mode
->height_mm
= pt
->height_mm_lo
| (pt
->width_height_mm_hi
& 0xf) << 8;
949 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
950 mode
->width_mm
*= 10;
951 mode
->height_mm
*= 10;
954 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
955 mode
->width_mm
= edid
->width_cm
* 10;
956 mode
->height_mm
= edid
->height_cm
* 10;
959 mode
->type
= DRM_MODE_TYPE_DRIVER
;
960 drm_mode_set_name(mode
);
966 mode_in_hsync_range(const struct drm_display_mode
*mode
,
967 struct edid
*edid
, u8
*t
)
969 int hsync
, hmin
, hmax
;
972 if (edid
->revision
>= 4)
973 hmin
+= ((t
[4] & 0x04) ? 255 : 0);
975 if (edid
->revision
>= 4)
976 hmax
+= ((t
[4] & 0x08) ? 255 : 0);
977 hsync
= drm_mode_hsync(mode
);
979 return (hsync
<= hmax
&& hsync
>= hmin
);
983 mode_in_vsync_range(const struct drm_display_mode
*mode
,
984 struct edid
*edid
, u8
*t
)
986 int vsync
, vmin
, vmax
;
989 if (edid
->revision
>= 4)
990 vmin
+= ((t
[4] & 0x01) ? 255 : 0);
992 if (edid
->revision
>= 4)
993 vmax
+= ((t
[4] & 0x02) ? 255 : 0);
994 vsync
= drm_mode_vrefresh(mode
);
996 return (vsync
<= vmax
&& vsync
>= vmin
);
1000 range_pixel_clock(struct edid
*edid
, u8
*t
)
1003 if (t
[9] == 0 || t
[9] == 255)
1006 /* 1.4 with CVT support gives us real precision, yay */
1007 if (edid
->revision
>= 4 && t
[10] == 0x04)
1008 return (t
[9] * 10000) - ((t
[12] >> 2) * 250);
1010 /* 1.3 is pathetic, so fuzz up a bit */
1011 return t
[9] * 10000 + 5001;
1015 mode_in_range(const struct drm_display_mode
*mode
, struct edid
*edid
,
1016 struct detailed_timing
*timing
)
1019 u8
*t
= (u8
*)timing
;
1021 if (!mode_in_hsync_range(mode
, edid
, t
))
1024 if (!mode_in_vsync_range(mode
, edid
, t
))
1027 if ((max_clock
= range_pixel_clock(edid
, t
)))
1028 if (mode
->clock
> max_clock
)
1031 /* 1.4 max horizontal check */
1032 if (edid
->revision
>= 4 && t
[10] == 0x04)
1033 if (t
[13] && mode
->hdisplay
> 8 * (t
[13] + (256 * (t
[12]&0x3))))
1036 if (mode_is_rb(mode
) && !drm_monitor_supports_rb(edid
))
1043 drm_dmt_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1044 struct detailed_timing
*timing
)
1047 struct drm_display_mode
*newmode
;
1048 struct drm_device
*dev
= connector
->dev
;
1050 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
1051 if (mode_in_range(drm_dmt_modes
+ i
, edid
, timing
)) {
1052 newmode
= drm_mode_duplicate(dev
, &drm_dmt_modes
[i
]);
1054 drm_mode_probed_add(connector
, newmode
);
1063 /* fix up 1366x768 mode from 1368x768;
1064 * GFT/CVT can't express 1366 width which isn't dividable by 8
1066 static void fixup_mode_1366x768(struct drm_display_mode
*mode
)
1068 if (mode
->hdisplay
== 1368 && mode
->vdisplay
== 768) {
1069 mode
->hdisplay
= 1366;
1070 mode
->hsync_start
--;
1072 drm_mode_set_name(mode
);
1077 drm_gtf_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1078 struct detailed_timing
*timing
)
1081 struct drm_display_mode
*newmode
;
1082 struct drm_device
*dev
= connector
->dev
;
1084 for (i
= 0; i
< num_extra_modes
; i
++) {
1085 const struct minimode
*m
= &extra_modes
[i
];
1086 newmode
= drm_gtf_mode(dev
, m
->w
, m
->h
, m
->r
, 0, 0);
1090 fixup_mode_1366x768(newmode
);
1091 if (!mode_in_range(newmode
, edid
, timing
)) {
1092 drm_mode_destroy(dev
, newmode
);
1096 drm_mode_probed_add(connector
, newmode
);
1104 drm_cvt_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1105 struct detailed_timing
*timing
)
1108 struct drm_display_mode
*newmode
;
1109 struct drm_device
*dev
= connector
->dev
;
1110 bool rb
= drm_monitor_supports_rb(edid
);
1112 for (i
= 0; i
< num_extra_modes
; i
++) {
1113 const struct minimode
*m
= &extra_modes
[i
];
1114 newmode
= drm_cvt_mode(dev
, m
->w
, m
->h
, m
->r
, rb
, 0, 0);
1118 fixup_mode_1366x768(newmode
);
1119 if (!mode_in_range(newmode
, edid
, timing
)) {
1120 drm_mode_destroy(dev
, newmode
);
1124 drm_mode_probed_add(connector
, newmode
);
1132 do_inferred_modes(struct detailed_timing
*timing
, void *c
)
1134 struct detailed_mode_closure
*closure
= c
;
1135 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1136 struct detailed_data_monitor_range
*range
= &data
->data
.range
;
1138 if (data
->type
!= EDID_DETAIL_MONITOR_RANGE
)
1141 closure
->modes
+= drm_dmt_modes_for_range(closure
->connector
,
1145 if (!version_greater(closure
->edid
, 1, 1))
1146 return; /* GTF not defined yet */
1148 switch (range
->flags
) {
1149 case 0x02: /* secondary gtf, XXX could do more */
1150 case 0x00: /* default gtf */
1151 closure
->modes
+= drm_gtf_modes_for_range(closure
->connector
,
1155 case 0x04: /* cvt, only in 1.4+ */
1156 if (!version_greater(closure
->edid
, 1, 3))
1159 closure
->modes
+= drm_cvt_modes_for_range(closure
->connector
,
1163 case 0x01: /* just the ranges, no formula */
1170 add_inferred_modes(struct drm_connector
*connector
, struct edid
*edid
)
1172 struct detailed_mode_closure closure
= {
1173 connector
, edid
, 0, 0, 0
1176 if (version_greater(edid
, 1, 0))
1177 drm_for_each_detailed_block((u8
*)edid
, do_inferred_modes
,
1180 return closure
.modes
;
1184 drm_est3_modes(struct drm_connector
*connector
, struct detailed_timing
*timing
)
1186 int i
, j
, m
, modes
= 0;
1187 struct drm_display_mode
*mode
;
1188 u8
*est
= ((u8
*)timing
) + 5;
1190 for (i
= 0; i
< 6; i
++) {
1191 for (j
= 7; j
> 0; j
--) {
1192 m
= (i
* 8) + (7 - j
);
1193 if (m
>= ARRAY_SIZE(est3_modes
))
1195 if (est
[i
] & (1 << j
)) {
1196 mode
= drm_mode_find_dmt(connector
->dev
,
1202 drm_mode_probed_add(connector
, mode
);
1213 do_established_modes(struct detailed_timing
*timing
, void *c
)
1215 struct detailed_mode_closure
*closure
= c
;
1216 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1218 if (data
->type
== EDID_DETAIL_EST_TIMINGS
)
1219 closure
->modes
+= drm_est3_modes(closure
->connector
, timing
);
1223 * add_established_modes - get est. modes from EDID and add them
1224 * @edid: EDID block to scan
1226 * Each EDID block contains a bitmap of the supported "established modes" list
1227 * (defined above). Tease them out and add them to the global modes list.
1230 add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
1232 struct drm_device
*dev
= connector
->dev
;
1233 unsigned long est_bits
= edid
->established_timings
.t1
|
1234 (edid
->established_timings
.t2
<< 8) |
1235 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
1237 struct detailed_mode_closure closure
= {
1238 connector
, edid
, 0, 0, 0
1241 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++) {
1242 if (est_bits
& (1<<i
)) {
1243 struct drm_display_mode
*newmode
;
1244 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
1246 drm_mode_probed_add(connector
, newmode
);
1252 if (version_greater(edid
, 1, 0))
1253 drm_for_each_detailed_block((u8
*)edid
,
1254 do_established_modes
, &closure
);
1256 return modes
+ closure
.modes
;
1260 do_standard_modes(struct detailed_timing
*timing
, void *c
)
1262 struct detailed_mode_closure
*closure
= c
;
1263 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1264 struct drm_connector
*connector
= closure
->connector
;
1265 struct edid
*edid
= closure
->edid
;
1267 if (data
->type
== EDID_DETAIL_STD_MODES
) {
1269 for (i
= 0; i
< 6; i
++) {
1270 struct std_timing
*std
;
1271 struct drm_display_mode
*newmode
;
1273 std
= &data
->data
.timings
[i
];
1274 newmode
= drm_mode_std(connector
, edid
, std
,
1277 drm_mode_probed_add(connector
, newmode
);
1285 * add_standard_modes - get std. modes from EDID and add them
1286 * @edid: EDID block to scan
1288 * Standard modes can be calculated using the appropriate standard (DMT,
1289 * GTF or CVT. Grab them from @edid and add them to the list.
1292 add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
1295 struct detailed_mode_closure closure
= {
1296 connector
, edid
, 0, 0, 0
1299 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
1300 struct drm_display_mode
*newmode
;
1302 newmode
= drm_mode_std(connector
, edid
,
1303 &edid
->standard_timings
[i
],
1306 drm_mode_probed_add(connector
, newmode
);
1311 if (version_greater(edid
, 1, 0))
1312 drm_for_each_detailed_block((u8
*)edid
, do_standard_modes
,
1315 /* XXX should also look for standard codes in VTB blocks */
1317 return modes
+ closure
.modes
;
1320 static int drm_cvt_modes(struct drm_connector
*connector
,
1321 struct detailed_timing
*timing
)
1323 int i
, j
, modes
= 0;
1324 struct drm_display_mode
*newmode
;
1325 struct drm_device
*dev
= connector
->dev
;
1326 struct cvt_timing
*cvt
;
1327 const int rates
[] = { 60, 85, 75, 60, 50 };
1328 const u8 empty
[3] = { 0, 0, 0 };
1330 for (i
= 0; i
< 4; i
++) {
1331 int uninitialized_var(width
), height
;
1332 cvt
= &(timing
->data
.other_data
.data
.cvt
[i
]);
1334 if (!memcmp(cvt
->code
, empty
, 3))
1337 height
= (cvt
->code
[0] + ((cvt
->code
[1] & 0xf0) << 4) + 1) * 2;
1338 switch (cvt
->code
[1] & 0x0c) {
1340 width
= height
* 4 / 3;
1343 width
= height
* 16 / 9;
1346 width
= height
* 16 / 10;
1349 width
= height
* 15 / 9;
1353 for (j
= 1; j
< 5; j
++) {
1354 if (cvt
->code
[2] & (1 << j
)) {
1355 newmode
= drm_cvt_mode(dev
, width
, height
,
1359 drm_mode_probed_add(connector
, newmode
);
1370 do_cvt_mode(struct detailed_timing
*timing
, void *c
)
1372 struct detailed_mode_closure
*closure
= c
;
1373 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1375 if (data
->type
== EDID_DETAIL_CVT_3BYTE
)
1376 closure
->modes
+= drm_cvt_modes(closure
->connector
, timing
);
1380 add_cvt_modes(struct drm_connector
*connector
, struct edid
*edid
)
1382 struct detailed_mode_closure closure
= {
1383 connector
, edid
, 0, 0, 0
1386 if (version_greater(edid
, 1, 2))
1387 drm_for_each_detailed_block((u8
*)edid
, do_cvt_mode
, &closure
);
1389 /* XXX should also look for CVT codes in VTB blocks */
1391 return closure
.modes
;
1395 do_detailed_mode(struct detailed_timing
*timing
, void *c
)
1397 struct detailed_mode_closure
*closure
= c
;
1398 struct drm_display_mode
*newmode
;
1400 if (timing
->pixel_clock
) {
1401 newmode
= drm_mode_detailed(closure
->connector
->dev
,
1402 closure
->edid
, timing
,
1407 if (closure
->preferred
)
1408 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
1410 drm_mode_probed_add(closure
->connector
, newmode
);
1412 closure
->preferred
= 0;
1417 * add_detailed_modes - Add modes from detailed timings
1418 * @connector: attached connector
1419 * @edid: EDID block to scan
1420 * @quirks: quirks to apply
1423 add_detailed_modes(struct drm_connector
*connector
, struct edid
*edid
,
1426 struct detailed_mode_closure closure
= {
1434 if (closure
.preferred
&& !version_greater(edid
, 1, 3))
1436 (edid
->features
& DRM_EDID_FEATURE_PREFERRED_TIMING
);
1438 drm_for_each_detailed_block((u8
*)edid
, do_detailed_mode
, &closure
);
1440 return closure
.modes
;
1443 #define HDMI_IDENTIFIER 0x000C03
1444 #define AUDIO_BLOCK 0x01
1445 #define VIDEO_BLOCK 0x02
1446 #define VENDOR_BLOCK 0x03
1447 #define SPEAKER_BLOCK 0x04
1448 #define EDID_BASIC_AUDIO (1 << 6)
1449 #define EDID_CEA_YCRCB444 (1 << 5)
1450 #define EDID_CEA_YCRCB422 (1 << 4)
1453 * Search EDID for CEA extension block.
1455 u8
*drm_find_cea_extension(struct edid
*edid
)
1457 u8
*edid_ext
= NULL
;
1460 /* No EDID or EDID extensions */
1461 if (edid
== NULL
|| edid
->extensions
== 0)
1464 /* Find CEA extension */
1465 for (i
= 0; i
< edid
->extensions
; i
++) {
1466 edid_ext
= (u8
*)edid
+ EDID_LENGTH
* (i
+ 1);
1467 if (edid_ext
[0] == CEA_EXT
)
1471 if (i
== edid
->extensions
)
1476 EXPORT_SYMBOL(drm_find_cea_extension
);
1479 do_cea_modes (struct drm_connector
*connector
, u8
*db
, u8 len
)
1481 struct drm_device
*dev
= connector
->dev
;
1482 u8
* mode
, cea_mode
;
1485 for (mode
= db
; mode
< db
+ len
; mode
++) {
1486 cea_mode
= (*mode
& 127) - 1; /* CEA modes are numbered 1..127 */
1487 if (cea_mode
< drm_num_cea_modes
) {
1488 struct drm_display_mode
*newmode
;
1489 newmode
= drm_mode_duplicate(dev
,
1490 &edid_cea_modes
[cea_mode
]);
1492 drm_mode_probed_add(connector
, newmode
);
1502 add_cea_modes(struct drm_connector
*connector
, struct edid
*edid
)
1504 u8
* cea
= drm_find_cea_extension(edid
);
1508 if (cea
&& cea
[1] >= 3) {
1509 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1511 if (((db
[0] & 0xe0) >> 5) == VIDEO_BLOCK
)
1512 modes
+= do_cea_modes (connector
, db
+1, dbl
);
1520 parse_hdmi_vsdb(struct drm_connector
*connector
, uint8_t *db
)
1522 connector
->eld
[5] |= (db
[6] >> 7) << 1; /* Supports_AI */
1524 connector
->dvi_dual
= db
[6] & 1;
1525 connector
->max_tmds_clock
= db
[7] * 5;
1527 connector
->latency_present
[0] = db
[8] >> 7;
1528 connector
->latency_present
[1] = (db
[8] >> 6) & 1;
1529 connector
->video_latency
[0] = db
[9];
1530 connector
->audio_latency
[0] = db
[10];
1531 connector
->video_latency
[1] = db
[11];
1532 connector
->audio_latency
[1] = db
[12];
1534 DRM_LOG_KMS("HDMI: DVI dual %d, "
1535 "max TMDS clock %d, "
1536 "latency present %d %d, "
1537 "video latency %d %d, "
1538 "audio latency %d %d\n",
1539 connector
->dvi_dual
,
1540 connector
->max_tmds_clock
,
1541 (int) connector
->latency_present
[0],
1542 (int) connector
->latency_present
[1],
1543 connector
->video_latency
[0],
1544 connector
->video_latency
[1],
1545 connector
->audio_latency
[0],
1546 connector
->audio_latency
[1]);
1550 monitor_name(struct detailed_timing
*t
, void *data
)
1552 if (t
->data
.other_data
.type
== EDID_DETAIL_MONITOR_NAME
)
1553 *(u8
**)data
= t
->data
.other_data
.data
.str
.str
;
1557 * drm_edid_to_eld - build ELD from EDID
1558 * @connector: connector corresponding to the HDMI/DP sink
1559 * @edid: EDID to parse
1561 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1562 * Some ELD fields are left to the graphics driver caller:
1567 void drm_edid_to_eld(struct drm_connector
*connector
, struct edid
*edid
)
1569 uint8_t *eld
= connector
->eld
;
1577 memset(eld
, 0, sizeof(connector
->eld
));
1579 cea
= drm_find_cea_extension(edid
);
1581 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1586 drm_for_each_detailed_block((u8
*)edid
, monitor_name
, &name
);
1587 for (mnl
= 0; name
&& mnl
< 13; mnl
++) {
1588 if (name
[mnl
] == 0x0a)
1590 eld
[20 + mnl
] = name
[mnl
];
1592 eld
[4] = (cea
[1] << 5) | mnl
;
1593 DRM_DEBUG_KMS("ELD monitor %s\n", eld
+ 20);
1595 eld
[0] = 2 << 3; /* ELD version: 2 */
1597 eld
[16] = edid
->mfg_id
[0];
1598 eld
[17] = edid
->mfg_id
[1];
1599 eld
[18] = edid
->prod_code
[0];
1600 eld
[19] = edid
->prod_code
[1];
1603 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1606 switch ((db
[0] & 0xe0) >> 5) {
1608 /* Audio Data Block, contains SADs */
1609 sad_count
= dbl
/ 3;
1610 memcpy(eld
+ 20 + mnl
, &db
[1], dbl
);
1613 /* Speaker Allocation Data Block */
1617 /* HDMI Vendor-Specific Data Block */
1618 if (db
[1] == 0x03 && db
[2] == 0x0c && db
[3] == 0)
1619 parse_hdmi_vsdb(connector
, db
);
1625 eld
[5] |= sad_count
<< 4;
1626 eld
[2] = (20 + mnl
+ sad_count
* 3 + 3) / 4;
1628 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld
[2], sad_count
);
1630 EXPORT_SYMBOL(drm_edid_to_eld
);
1633 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1634 * @connector: connector associated with the HDMI/DP sink
1635 * @mode: the display mode
1637 int drm_av_sync_delay(struct drm_connector
*connector
,
1638 struct drm_display_mode
*mode
)
1640 int i
= !!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
);
1643 if (!connector
->latency_present
[0])
1645 if (!connector
->latency_present
[1])
1648 a
= connector
->audio_latency
[i
];
1649 v
= connector
->video_latency
[i
];
1652 * HDMI/DP sink doesn't support audio or video?
1654 if (a
== 255 || v
== 255)
1658 * Convert raw EDID values to millisecond.
1659 * Treat unknown latency as 0ms.
1662 a
= min(2 * (a
- 1), 500);
1664 v
= min(2 * (v
- 1), 500);
1666 return max(v
- a
, 0);
1668 EXPORT_SYMBOL(drm_av_sync_delay
);
1671 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1672 * @encoder: the encoder just changed display mode
1673 * @mode: the adjusted display mode
1675 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1676 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1678 struct drm_connector
*drm_select_eld(struct drm_encoder
*encoder
,
1679 struct drm_display_mode
*mode
)
1681 struct drm_connector
*connector
;
1682 struct drm_device
*dev
= encoder
->dev
;
1684 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
1685 if (connector
->encoder
== encoder
&& connector
->eld
[0])
1690 EXPORT_SYMBOL(drm_select_eld
);
1693 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1694 * @edid: monitor EDID information
1696 * Parse the CEA extension according to CEA-861-B.
1697 * Return true if HDMI, false if not or unknown.
1699 bool drm_detect_hdmi_monitor(struct edid
*edid
)
1703 int start_offset
, end_offset
;
1704 bool is_hdmi
= false;
1706 edid_ext
= drm_find_cea_extension(edid
);
1710 /* Data block offset in CEA extension block */
1712 end_offset
= edid_ext
[2];
1715 * Because HDMI identifier is in Vendor Specific Block,
1716 * search it from all data blocks of CEA extension.
1718 for (i
= start_offset
; i
< end_offset
;
1719 /* Increased by data block len */
1720 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1721 /* Find vendor specific block */
1722 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
1723 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
1724 edid_ext
[i
+ 3] << 16;
1725 /* Find HDMI identifier */
1726 if (hdmi_id
== HDMI_IDENTIFIER
)
1735 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
1738 * drm_detect_monitor_audio - check monitor audio capability
1740 * Monitor should have CEA extension block.
1741 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1742 * audio' only. If there is any audio extension block and supported
1743 * audio format, assume at least 'basic audio' support, even if 'basic
1744 * audio' is not defined in EDID.
1747 bool drm_detect_monitor_audio(struct edid
*edid
)
1751 bool has_audio
= false;
1752 int start_offset
, end_offset
;
1754 edid_ext
= drm_find_cea_extension(edid
);
1758 has_audio
= ((edid_ext
[3] & EDID_BASIC_AUDIO
) != 0);
1761 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1765 /* Data block offset in CEA extension block */
1767 end_offset
= edid_ext
[2];
1769 for (i
= start_offset
; i
< end_offset
;
1770 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1771 if ((edid_ext
[i
] >> 5) == AUDIO_BLOCK
) {
1773 for (j
= 1; j
< (edid_ext
[i
] & 0x1f); j
+= 3)
1774 DRM_DEBUG_KMS("CEA audio format %d\n",
1775 (edid_ext
[i
+ j
] >> 3) & 0xf);
1782 EXPORT_SYMBOL(drm_detect_monitor_audio
);
1785 * drm_add_display_info - pull display info out if present
1787 * @info: display info (attached to connector)
1789 * Grab any available display info and stuff it into the drm_display_info
1790 * structure that's part of the connector. Useful for tracking bpp and
1793 static void drm_add_display_info(struct edid
*edid
,
1794 struct drm_display_info
*info
)
1798 info
->width_mm
= edid
->width_cm
* 10;
1799 info
->height_mm
= edid
->height_cm
* 10;
1801 /* driver figures it out in this case */
1803 info
->color_formats
= 0;
1805 if (edid
->revision
< 3)
1808 if (!(edid
->input
& DRM_EDID_INPUT_DIGITAL
))
1811 /* Get data from CEA blocks if present */
1812 edid_ext
= drm_find_cea_extension(edid
);
1814 info
->cea_rev
= edid_ext
[1];
1816 /* The existence of a CEA block should imply RGB support */
1817 info
->color_formats
= DRM_COLOR_FORMAT_RGB444
;
1818 if (edid_ext
[3] & EDID_CEA_YCRCB444
)
1819 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB444
;
1820 if (edid_ext
[3] & EDID_CEA_YCRCB422
)
1821 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB422
;
1824 /* Only defined for 1.4 with digital displays */
1825 if (edid
->revision
< 4)
1828 switch (edid
->input
& DRM_EDID_DIGITAL_DEPTH_MASK
) {
1829 case DRM_EDID_DIGITAL_DEPTH_6
:
1832 case DRM_EDID_DIGITAL_DEPTH_8
:
1835 case DRM_EDID_DIGITAL_DEPTH_10
:
1838 case DRM_EDID_DIGITAL_DEPTH_12
:
1841 case DRM_EDID_DIGITAL_DEPTH_14
:
1844 case DRM_EDID_DIGITAL_DEPTH_16
:
1847 case DRM_EDID_DIGITAL_DEPTH_UNDEF
:
1853 info
->color_formats
|= DRM_COLOR_FORMAT_RGB444
;
1854 if (edid
->features
& DRM_EDID_FEATURE_RGB_YCRCB444
)
1855 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB444
;
1856 if (edid
->features
& DRM_EDID_FEATURE_RGB_YCRCB422
)
1857 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB422
;
1861 * drm_add_edid_modes - add modes from EDID data, if available
1862 * @connector: connector we're probing
1865 * Add the specified modes to the connector's mode list.
1867 * Return number of modes added or 0 if we couldn't find any.
1869 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
1877 if (!drm_edid_is_valid(edid
)) {
1878 dev_warn(connector
->dev
->dev
, "%s: EDID invalid.\n",
1879 drm_get_connector_name(connector
));
1883 quirks
= edid_get_quirks(edid
);
1886 * EDID spec says modes should be preferred in this order:
1887 * - preferred detailed mode
1888 * - other detailed modes from base block
1889 * - detailed modes from extension blocks
1890 * - CVT 3-byte code modes
1891 * - standard timing codes
1892 * - established timing codes
1893 * - modes inferred from GTF or CVT range information
1895 * We get this pretty much right.
1897 * XXX order for additional mode types in extension blocks?
1899 num_modes
+= add_detailed_modes(connector
, edid
, quirks
);
1900 num_modes
+= add_cvt_modes(connector
, edid
);
1901 num_modes
+= add_standard_modes(connector
, edid
);
1902 num_modes
+= add_established_modes(connector
, edid
);
1903 num_modes
+= add_inferred_modes(connector
, edid
);
1904 num_modes
+= add_cea_modes(connector
, edid
);
1906 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
1907 edid_fixup_preferred(connector
, quirks
);
1909 drm_add_display_info(edid
, &connector
->display_info
);
1913 EXPORT_SYMBOL(drm_add_edid_modes
);
1916 * drm_add_modes_noedid - add modes for the connectors without EDID
1917 * @connector: connector we're probing
1918 * @hdisplay: the horizontal display limit
1919 * @vdisplay: the vertical display limit
1921 * Add the specified modes to the connector's mode list. Only when the
1922 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1924 * Return number of modes added or 0 if we couldn't find any.
1926 int drm_add_modes_noedid(struct drm_connector
*connector
,
1927 int hdisplay
, int vdisplay
)
1929 int i
, count
, num_modes
= 0;
1930 struct drm_display_mode
*mode
;
1931 struct drm_device
*dev
= connector
->dev
;
1933 count
= sizeof(drm_dmt_modes
) / sizeof(struct drm_display_mode
);
1939 for (i
= 0; i
< count
; i
++) {
1940 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
1941 if (hdisplay
&& vdisplay
) {
1943 * Only when two are valid, they will be used to check
1944 * whether the mode should be added to the mode list of
1947 if (ptr
->hdisplay
> hdisplay
||
1948 ptr
->vdisplay
> vdisplay
)
1951 if (drm_mode_vrefresh(ptr
) > 61)
1953 mode
= drm_mode_duplicate(dev
, ptr
);
1955 drm_mode_probed_add(connector
, mode
);
1961 EXPORT_SYMBOL(drm_add_modes_noedid
);