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/export.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
);
154 * Sanity check the EDID block (base or extension). Return 0 if the block
155 * doesn't check out, or 1 if it's valid.
157 bool drm_edid_block_valid(u8
*raw_edid
, int block
)
161 struct edid
*edid
= (struct edid
*)raw_edid
;
164 int score
= drm_edid_header_is_valid(raw_edid
);
166 else if (score
>= 6) {
167 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
168 memcpy(raw_edid
, edid_header
, sizeof(edid_header
));
174 for (i
= 0; i
< EDID_LENGTH
; i
++)
177 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum
);
179 /* allow CEA to slide through, switches mangle this */
180 if (raw_edid
[0] != 0x02)
184 /* per-block-type checks */
185 switch (raw_edid
[0]) {
187 if (edid
->version
!= 1) {
188 DRM_ERROR("EDID has major version %d, instead of 1\n", edid
->version
);
192 if (edid
->revision
> 4)
193 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
204 printk(KERN_ERR
"Raw EDID:\n");
205 print_hex_dump(KERN_ERR
, " \t", DUMP_PREFIX_NONE
, 16, 1,
206 raw_edid
, EDID_LENGTH
, false);
210 EXPORT_SYMBOL(drm_edid_block_valid
);
213 * drm_edid_is_valid - sanity check EDID data
216 * Sanity-check an entire EDID record (including extensions)
218 bool drm_edid_is_valid(struct edid
*edid
)
221 u8
*raw
= (u8
*)edid
;
226 for (i
= 0; i
<= edid
->extensions
; i
++)
227 if (!drm_edid_block_valid(raw
+ i
* EDID_LENGTH
, i
))
232 EXPORT_SYMBOL(drm_edid_is_valid
);
234 #define DDC_SEGMENT_ADDR 0x30
236 * Get EDID information via I2C.
238 * \param adapter : i2c device adaptor
239 * \param buf : EDID data buffer to be filled
240 * \param len : EDID data buffer length
241 * \return 0 on success or -1 on failure.
243 * Try to fetch EDID information by calling i2c driver function.
246 drm_do_probe_ddc_edid(struct i2c_adapter
*adapter
, unsigned char *buf
,
249 unsigned char start
= block
* EDID_LENGTH
;
250 int ret
, retries
= 5;
252 /* The core i2c driver will automatically retry the transfer if the
253 * adapter reports EAGAIN. However, we find that bit-banging transfers
254 * are susceptible to errors under a heavily loaded machine and
255 * generate spurious NAKs and timeouts. Retrying the transfer
256 * of the individual block a few times seems to overcome this.
259 struct i2c_msg msgs
[] = {
272 ret
= i2c_transfer(adapter
, msgs
, 2);
274 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
278 } while (ret
!= 2 && --retries
);
280 return ret
== 2 ? 0 : -1;
283 static bool drm_edid_is_zero(u8
*in_edid
, int length
)
286 u32
*raw_edid
= (u32
*)in_edid
;
288 for (i
= 0; i
< length
/ 4; i
++)
289 if (*(raw_edid
+ i
) != 0)
295 drm_do_get_edid(struct drm_connector
*connector
, struct i2c_adapter
*adapter
)
297 int i
, j
= 0, valid_extensions
= 0;
300 if ((block
= kmalloc(EDID_LENGTH
, GFP_KERNEL
)) == NULL
)
303 /* base block fetch */
304 for (i
= 0; i
< 4; i
++) {
305 if (drm_do_probe_ddc_edid(adapter
, block
, 0, EDID_LENGTH
))
307 if (drm_edid_block_valid(block
, 0))
309 if (i
== 0 && drm_edid_is_zero(block
, EDID_LENGTH
)) {
310 connector
->null_edid_counter
++;
317 /* if there's no extensions, we're done */
318 if (block
[0x7e] == 0)
321 new = krealloc(block
, (block
[0x7e] + 1) * EDID_LENGTH
, GFP_KERNEL
);
326 for (j
= 1; j
<= block
[0x7e]; j
++) {
327 for (i
= 0; i
< 4; i
++) {
328 if (drm_do_probe_ddc_edid(adapter
,
329 block
+ (valid_extensions
+ 1) * EDID_LENGTH
,
332 if (drm_edid_block_valid(block
+ (valid_extensions
+ 1) * EDID_LENGTH
, j
)) {
338 dev_warn(connector
->dev
->dev
,
339 "%s: Ignoring invalid EDID block %d.\n",
340 drm_get_connector_name(connector
), j
);
343 if (valid_extensions
!= block
[0x7e]) {
344 block
[EDID_LENGTH
-1] += block
[0x7e] - valid_extensions
;
345 block
[0x7e] = valid_extensions
;
346 new = krealloc(block
, (valid_extensions
+ 1) * EDID_LENGTH
, GFP_KERNEL
);
355 dev_warn(connector
->dev
->dev
, "%s: EDID block %d invalid.\n",
356 drm_get_connector_name(connector
), j
);
364 * Probe DDC presence.
366 * \param adapter : i2c device adaptor
367 * \return 1 on success
370 drm_probe_ddc(struct i2c_adapter
*adapter
)
374 return (drm_do_probe_ddc_edid(adapter
, &out
, 0, 1) == 0);
378 * drm_get_edid - get EDID data, if available
379 * @connector: connector we're probing
380 * @adapter: i2c adapter to use for DDC
382 * Poke the given i2c channel to grab EDID data if possible. If found,
383 * attach it to the connector.
385 * Return edid data or NULL if we couldn't find any.
387 struct edid
*drm_get_edid(struct drm_connector
*connector
,
388 struct i2c_adapter
*adapter
)
390 struct edid
*edid
= NULL
;
392 if (drm_probe_ddc(adapter
))
393 edid
= (struct edid
*)drm_do_get_edid(connector
, adapter
);
395 connector
->display_info
.raw_edid
= (char *)edid
;
400 EXPORT_SYMBOL(drm_get_edid
);
402 /*** EDID parsing ***/
405 * edid_vendor - match a string against EDID's obfuscated vendor field
406 * @edid: EDID to match
407 * @vendor: vendor string
409 * Returns true if @vendor is in @edid, false otherwise
411 static bool edid_vendor(struct edid
*edid
, char *vendor
)
415 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
416 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
417 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
418 edid_vendor
[2] = (edid
->mfg_id
[1] & 0x1f) + '@';
420 return !strncmp(edid_vendor
, vendor
, 3);
424 * edid_get_quirks - return quirk flags for a given EDID
425 * @edid: EDID to process
427 * This tells subsequent routines what fixes they need to apply.
429 static u32
edid_get_quirks(struct edid
*edid
)
431 struct edid_quirk
*quirk
;
434 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
435 quirk
= &edid_quirk_list
[i
];
437 if (edid_vendor(edid
, quirk
->vendor
) &&
438 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
439 return quirk
->quirks
;
445 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
446 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
449 * edid_fixup_preferred - set preferred modes based on quirk list
450 * @connector: has mode list to fix up
451 * @quirks: quirks list
453 * Walk the mode list for @connector, clearing the preferred status
454 * on existing modes and setting it anew for the right mode ala @quirks.
456 static void edid_fixup_preferred(struct drm_connector
*connector
,
459 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
460 int target_refresh
= 0;
462 if (list_empty(&connector
->probed_modes
))
465 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
467 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
470 preferred_mode
= list_first_entry(&connector
->probed_modes
,
471 struct drm_display_mode
, head
);
473 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
474 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
476 if (cur_mode
== preferred_mode
)
479 /* Largest mode is preferred */
480 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
481 preferred_mode
= cur_mode
;
483 /* At a given size, try to get closest to target refresh */
484 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
485 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
486 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
487 preferred_mode
= cur_mode
;
491 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
495 mode_is_rb(const struct drm_display_mode
*mode
)
497 return (mode
->htotal
- mode
->hdisplay
== 160) &&
498 (mode
->hsync_end
- mode
->hdisplay
== 80) &&
499 (mode
->hsync_end
- mode
->hsync_start
== 32) &&
500 (mode
->vsync_start
- mode
->vdisplay
== 3);
504 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
505 * @dev: Device to duplicate against
507 * @vsize: Mode height
508 * @fresh: Mode refresh rate
509 * @rb: Mode reduced-blanking-ness
511 * Walk the DMT mode list looking for a match for the given parameters.
512 * Return a newly allocated copy of the mode, or NULL if not found.
514 struct drm_display_mode
*drm_mode_find_dmt(struct drm_device
*dev
,
515 int hsize
, int vsize
, int fresh
,
520 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
521 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
522 if (hsize
!= ptr
->hdisplay
)
524 if (vsize
!= ptr
->vdisplay
)
526 if (fresh
!= drm_mode_vrefresh(ptr
))
528 if (rb
!= mode_is_rb(ptr
))
531 return drm_mode_duplicate(dev
, ptr
);
536 EXPORT_SYMBOL(drm_mode_find_dmt
);
538 typedef void detailed_cb(struct detailed_timing
*timing
, void *closure
);
541 cea_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
545 u8
*det_base
= ext
+ d
;
548 for (i
= 0; i
< n
; i
++)
549 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
553 vtb_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
555 unsigned int i
, n
= min((int)ext
[0x02], 6);
556 u8
*det_base
= ext
+ 5;
559 return; /* unknown version */
561 for (i
= 0; i
< n
; i
++)
562 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
566 drm_for_each_detailed_block(u8
*raw_edid
, detailed_cb
*cb
, void *closure
)
569 struct edid
*edid
= (struct edid
*)raw_edid
;
574 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++)
575 cb(&(edid
->detailed_timings
[i
]), closure
);
577 for (i
= 1; i
<= raw_edid
[0x7e]; i
++) {
578 u8
*ext
= raw_edid
+ (i
* EDID_LENGTH
);
581 cea_for_each_detailed_block(ext
, cb
, closure
);
584 vtb_for_each_detailed_block(ext
, cb
, closure
);
593 is_rb(struct detailed_timing
*t
, void *data
)
596 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
)
598 *(bool *)data
= true;
601 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
603 drm_monitor_supports_rb(struct edid
*edid
)
605 if (edid
->revision
>= 4) {
607 drm_for_each_detailed_block((u8
*)edid
, is_rb
, &ret
);
611 return ((edid
->input
& DRM_EDID_INPUT_DIGITAL
) != 0);
615 find_gtf2(struct detailed_timing
*t
, void *data
)
618 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
&& r
[10] == 0x02)
622 /* Secondary GTF curve kicks in above some break frequency */
624 drm_gtf2_hbreak(struct edid
*edid
)
627 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
628 return r
? (r
[12] * 2) : 0;
632 drm_gtf2_2c(struct edid
*edid
)
635 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
636 return r
? r
[13] : 0;
640 drm_gtf2_m(struct edid
*edid
)
643 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
644 return r
? (r
[15] << 8) + r
[14] : 0;
648 drm_gtf2_k(struct edid
*edid
)
651 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
652 return r
? r
[16] : 0;
656 drm_gtf2_2j(struct edid
*edid
)
659 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
660 return r
? r
[17] : 0;
664 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
665 * @edid: EDID block to scan
667 static int standard_timing_level(struct edid
*edid
)
669 if (edid
->revision
>= 2) {
670 if (edid
->revision
>= 4 && (edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
))
672 if (drm_gtf2_hbreak(edid
))
680 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
681 * monitors fill with ascii space (0x20) instead.
684 bad_std_timing(u8 a
, u8 b
)
686 return (a
== 0x00 && b
== 0x00) ||
687 (a
== 0x01 && b
== 0x01) ||
688 (a
== 0x20 && b
== 0x20);
692 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
693 * @t: standard timing params
694 * @timing_level: standard timing level
696 * Take the standard timing params (in this case width, aspect, and refresh)
697 * and convert them into a real mode using CVT/GTF/DMT.
699 static struct drm_display_mode
*
700 drm_mode_std(struct drm_connector
*connector
, struct edid
*edid
,
701 struct std_timing
*t
, int revision
)
703 struct drm_device
*dev
= connector
->dev
;
704 struct drm_display_mode
*m
, *mode
= NULL
;
707 unsigned aspect_ratio
= (t
->vfreq_aspect
& EDID_TIMING_ASPECT_MASK
)
708 >> EDID_TIMING_ASPECT_SHIFT
;
709 unsigned vfreq
= (t
->vfreq_aspect
& EDID_TIMING_VFREQ_MASK
)
710 >> EDID_TIMING_VFREQ_SHIFT
;
711 int timing_level
= standard_timing_level(edid
);
713 if (bad_std_timing(t
->hsize
, t
->vfreq_aspect
))
716 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
717 hsize
= t
->hsize
* 8 + 248;
718 /* vrefresh_rate = vfreq + 60 */
719 vrefresh_rate
= vfreq
+ 60;
720 /* the vdisplay is calculated based on the aspect ratio */
721 if (aspect_ratio
== 0) {
725 vsize
= (hsize
* 10) / 16;
726 } else if (aspect_ratio
== 1)
727 vsize
= (hsize
* 3) / 4;
728 else if (aspect_ratio
== 2)
729 vsize
= (hsize
* 4) / 5;
731 vsize
= (hsize
* 9) / 16;
733 /* HDTV hack, part 1 */
734 if (vrefresh_rate
== 60 &&
735 ((hsize
== 1360 && vsize
== 765) ||
736 (hsize
== 1368 && vsize
== 769))) {
742 * If this connector already has a mode for this size and refresh
743 * rate (because it came from detailed or CVT info), use that
744 * instead. This way we don't have to guess at interlace or
747 list_for_each_entry(m
, &connector
->probed_modes
, head
)
748 if (m
->hdisplay
== hsize
&& m
->vdisplay
== vsize
&&
749 drm_mode_vrefresh(m
) == vrefresh_rate
)
752 /* HDTV hack, part 2 */
753 if (hsize
== 1366 && vsize
== 768 && vrefresh_rate
== 60) {
754 mode
= drm_cvt_mode(dev
, 1366, 768, vrefresh_rate
, 0, 0,
756 mode
->hdisplay
= 1366;
757 mode
->hsync_start
= mode
->hsync_start
- 1;
758 mode
->hsync_end
= mode
->hsync_end
- 1;
762 /* check whether it can be found in default mode table */
763 if (drm_monitor_supports_rb(edid
)) {
764 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
,
769 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
, false);
773 /* okay, generate it */
774 switch (timing_level
) {
778 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
782 * This is potentially wrong if there's ever a monitor with
783 * more than one ranges section, each claiming a different
784 * secondary GTF curve. Please don't do that.
786 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
789 if (drm_mode_hsync(mode
) > drm_gtf2_hbreak(edid
)) {
790 drm_mode_destroy(dev
, mode
);
791 mode
= drm_gtf_mode_complex(dev
, hsize
, vsize
,
800 mode
= drm_cvt_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0,
808 * EDID is delightfully ambiguous about how interlaced modes are to be
809 * encoded. Our internal representation is of frame height, but some
810 * HDTV detailed timings are encoded as field height.
812 * The format list here is from CEA, in frame size. Technically we
813 * should be checking refresh rate too. Whatever.
816 drm_mode_do_interlace_quirk(struct drm_display_mode
*mode
,
817 struct detailed_pixel_timing
*pt
)
820 static const struct {
822 } cea_interlaced
[] = {
832 if (!(pt
->misc
& DRM_EDID_PT_INTERLACED
))
835 for (i
= 0; i
< ARRAY_SIZE(cea_interlaced
); i
++) {
836 if ((mode
->hdisplay
== cea_interlaced
[i
].w
) &&
837 (mode
->vdisplay
== cea_interlaced
[i
].h
/ 2)) {
839 mode
->vsync_start
*= 2;
840 mode
->vsync_end
*= 2;
846 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
850 * drm_mode_detailed - create a new mode from an EDID detailed timing section
851 * @dev: DRM device (needed to create new mode)
853 * @timing: EDID detailed timing info
854 * @quirks: quirks to apply
856 * An EDID detailed timing block contains enough info for us to create and
857 * return a new struct drm_display_mode.
859 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
861 struct detailed_timing
*timing
,
864 struct drm_display_mode
*mode
;
865 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
866 unsigned hactive
= (pt
->hactive_hblank_hi
& 0xf0) << 4 | pt
->hactive_lo
;
867 unsigned vactive
= (pt
->vactive_vblank_hi
& 0xf0) << 4 | pt
->vactive_lo
;
868 unsigned hblank
= (pt
->hactive_hblank_hi
& 0xf) << 8 | pt
->hblank_lo
;
869 unsigned vblank
= (pt
->vactive_vblank_hi
& 0xf) << 8 | pt
->vblank_lo
;
870 unsigned hsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc0) << 2 | pt
->hsync_offset_lo
;
871 unsigned hsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x30) << 4 | pt
->hsync_pulse_width_lo
;
872 unsigned vsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc) >> 2 | pt
->vsync_offset_pulse_width_lo
>> 4;
873 unsigned vsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x3) << 4 | (pt
->vsync_offset_pulse_width_lo
& 0xf);
875 /* ignore tiny modes */
876 if (hactive
< 64 || vactive
< 64)
879 if (pt
->misc
& DRM_EDID_PT_STEREO
) {
880 printk(KERN_WARNING
"stereo mode not supported\n");
883 if (!(pt
->misc
& DRM_EDID_PT_SEPARATE_SYNC
)) {
884 printk(KERN_WARNING
"composite sync not supported\n");
887 /* it is incorrect if hsync/vsync width is zero */
888 if (!hsync_pulse_width
|| !vsync_pulse_width
) {
889 DRM_DEBUG_KMS("Incorrect Detailed timing. "
890 "Wrong Hsync/Vsync pulse width\n");
894 if (quirks
& EDID_QUIRK_FORCE_REDUCED_BLANKING
) {
895 mode
= drm_cvt_mode(dev
, hactive
, vactive
, 60, true, false, false);
902 mode
= drm_mode_create(dev
);
906 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
907 timing
->pixel_clock
= cpu_to_le16(1088);
909 mode
->clock
= le16_to_cpu(timing
->pixel_clock
) * 10;
911 mode
->hdisplay
= hactive
;
912 mode
->hsync_start
= mode
->hdisplay
+ hsync_offset
;
913 mode
->hsync_end
= mode
->hsync_start
+ hsync_pulse_width
;
914 mode
->htotal
= mode
->hdisplay
+ hblank
;
916 mode
->vdisplay
= vactive
;
917 mode
->vsync_start
= mode
->vdisplay
+ vsync_offset
;
918 mode
->vsync_end
= mode
->vsync_start
+ vsync_pulse_width
;
919 mode
->vtotal
= mode
->vdisplay
+ vblank
;
921 /* Some EDIDs have bogus h/vtotal values */
922 if (mode
->hsync_end
> mode
->htotal
)
923 mode
->htotal
= mode
->hsync_end
+ 1;
924 if (mode
->vsync_end
> mode
->vtotal
)
925 mode
->vtotal
= mode
->vsync_end
+ 1;
927 drm_mode_do_interlace_quirk(mode
, pt
);
929 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
930 pt
->misc
|= DRM_EDID_PT_HSYNC_POSITIVE
| DRM_EDID_PT_VSYNC_POSITIVE
;
933 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_HSYNC_POSITIVE
) ?
934 DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
935 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_VSYNC_POSITIVE
) ?
936 DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
939 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_height_mm_hi
& 0xf0) << 4;
940 mode
->height_mm
= pt
->height_mm_lo
| (pt
->width_height_mm_hi
& 0xf) << 8;
942 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
943 mode
->width_mm
*= 10;
944 mode
->height_mm
*= 10;
947 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
948 mode
->width_mm
= edid
->width_cm
* 10;
949 mode
->height_mm
= edid
->height_cm
* 10;
952 mode
->type
= DRM_MODE_TYPE_DRIVER
;
953 drm_mode_set_name(mode
);
959 mode_in_hsync_range(const struct drm_display_mode
*mode
,
960 struct edid
*edid
, u8
*t
)
962 int hsync
, hmin
, hmax
;
965 if (edid
->revision
>= 4)
966 hmin
+= ((t
[4] & 0x04) ? 255 : 0);
968 if (edid
->revision
>= 4)
969 hmax
+= ((t
[4] & 0x08) ? 255 : 0);
970 hsync
= drm_mode_hsync(mode
);
972 return (hsync
<= hmax
&& hsync
>= hmin
);
976 mode_in_vsync_range(const struct drm_display_mode
*mode
,
977 struct edid
*edid
, u8
*t
)
979 int vsync
, vmin
, vmax
;
982 if (edid
->revision
>= 4)
983 vmin
+= ((t
[4] & 0x01) ? 255 : 0);
985 if (edid
->revision
>= 4)
986 vmax
+= ((t
[4] & 0x02) ? 255 : 0);
987 vsync
= drm_mode_vrefresh(mode
);
989 return (vsync
<= vmax
&& vsync
>= vmin
);
993 range_pixel_clock(struct edid
*edid
, u8
*t
)
996 if (t
[9] == 0 || t
[9] == 255)
999 /* 1.4 with CVT support gives us real precision, yay */
1000 if (edid
->revision
>= 4 && t
[10] == 0x04)
1001 return (t
[9] * 10000) - ((t
[12] >> 2) * 250);
1003 /* 1.3 is pathetic, so fuzz up a bit */
1004 return t
[9] * 10000 + 5001;
1008 mode_in_range(const struct drm_display_mode
*mode
, struct edid
*edid
,
1009 struct detailed_timing
*timing
)
1012 u8
*t
= (u8
*)timing
;
1014 if (!mode_in_hsync_range(mode
, edid
, t
))
1017 if (!mode_in_vsync_range(mode
, edid
, t
))
1020 if ((max_clock
= range_pixel_clock(edid
, t
)))
1021 if (mode
->clock
> max_clock
)
1024 /* 1.4 max horizontal check */
1025 if (edid
->revision
>= 4 && t
[10] == 0x04)
1026 if (t
[13] && mode
->hdisplay
> 8 * (t
[13] + (256 * (t
[12]&0x3))))
1029 if (mode_is_rb(mode
) && !drm_monitor_supports_rb(edid
))
1036 drm_dmt_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1037 struct detailed_timing
*timing
)
1040 struct drm_display_mode
*newmode
;
1041 struct drm_device
*dev
= connector
->dev
;
1043 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
1044 if (mode_in_range(drm_dmt_modes
+ i
, edid
, timing
)) {
1045 newmode
= drm_mode_duplicate(dev
, &drm_dmt_modes
[i
]);
1047 drm_mode_probed_add(connector
, newmode
);
1056 /* fix up 1366x768 mode from 1368x768;
1057 * GFT/CVT can't express 1366 width which isn't dividable by 8
1059 static void fixup_mode_1366x768(struct drm_display_mode
*mode
)
1061 if (mode
->hdisplay
== 1368 && mode
->vdisplay
== 768) {
1062 mode
->hdisplay
= 1366;
1063 mode
->hsync_start
--;
1065 drm_mode_set_name(mode
);
1070 drm_gtf_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1071 struct detailed_timing
*timing
)
1074 struct drm_display_mode
*newmode
;
1075 struct drm_device
*dev
= connector
->dev
;
1077 for (i
= 0; i
< num_extra_modes
; i
++) {
1078 const struct minimode
*m
= &extra_modes
[i
];
1079 newmode
= drm_gtf_mode(dev
, m
->w
, m
->h
, m
->r
, 0, 0);
1083 fixup_mode_1366x768(newmode
);
1084 if (!mode_in_range(newmode
, edid
, timing
)) {
1085 drm_mode_destroy(dev
, newmode
);
1089 drm_mode_probed_add(connector
, newmode
);
1097 drm_cvt_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1098 struct detailed_timing
*timing
)
1101 struct drm_display_mode
*newmode
;
1102 struct drm_device
*dev
= connector
->dev
;
1103 bool rb
= drm_monitor_supports_rb(edid
);
1105 for (i
= 0; i
< num_extra_modes
; i
++) {
1106 const struct minimode
*m
= &extra_modes
[i
];
1107 newmode
= drm_cvt_mode(dev
, m
->w
, m
->h
, m
->r
, rb
, 0, 0);
1111 fixup_mode_1366x768(newmode
);
1112 if (!mode_in_range(newmode
, edid
, timing
)) {
1113 drm_mode_destroy(dev
, newmode
);
1117 drm_mode_probed_add(connector
, newmode
);
1125 do_inferred_modes(struct detailed_timing
*timing
, void *c
)
1127 struct detailed_mode_closure
*closure
= c
;
1128 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1129 struct detailed_data_monitor_range
*range
= &data
->data
.range
;
1131 if (data
->type
!= EDID_DETAIL_MONITOR_RANGE
)
1134 closure
->modes
+= drm_dmt_modes_for_range(closure
->connector
,
1138 if (!version_greater(closure
->edid
, 1, 1))
1139 return; /* GTF not defined yet */
1141 switch (range
->flags
) {
1142 case 0x02: /* secondary gtf, XXX could do more */
1143 case 0x00: /* default gtf */
1144 closure
->modes
+= drm_gtf_modes_for_range(closure
->connector
,
1148 case 0x04: /* cvt, only in 1.4+ */
1149 if (!version_greater(closure
->edid
, 1, 3))
1152 closure
->modes
+= drm_cvt_modes_for_range(closure
->connector
,
1156 case 0x01: /* just the ranges, no formula */
1163 add_inferred_modes(struct drm_connector
*connector
, struct edid
*edid
)
1165 struct detailed_mode_closure closure
= {
1166 connector
, edid
, 0, 0, 0
1169 if (version_greater(edid
, 1, 0))
1170 drm_for_each_detailed_block((u8
*)edid
, do_inferred_modes
,
1173 return closure
.modes
;
1177 drm_est3_modes(struct drm_connector
*connector
, struct detailed_timing
*timing
)
1179 int i
, j
, m
, modes
= 0;
1180 struct drm_display_mode
*mode
;
1181 u8
*est
= ((u8
*)timing
) + 5;
1183 for (i
= 0; i
< 6; i
++) {
1184 for (j
= 7; j
> 0; j
--) {
1185 m
= (i
* 8) + (7 - j
);
1186 if (m
>= ARRAY_SIZE(est3_modes
))
1188 if (est
[i
] & (1 << j
)) {
1189 mode
= drm_mode_find_dmt(connector
->dev
,
1195 drm_mode_probed_add(connector
, mode
);
1206 do_established_modes(struct detailed_timing
*timing
, void *c
)
1208 struct detailed_mode_closure
*closure
= c
;
1209 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1211 if (data
->type
== EDID_DETAIL_EST_TIMINGS
)
1212 closure
->modes
+= drm_est3_modes(closure
->connector
, timing
);
1216 * add_established_modes - get est. modes from EDID and add them
1217 * @edid: EDID block to scan
1219 * Each EDID block contains a bitmap of the supported "established modes" list
1220 * (defined above). Tease them out and add them to the global modes list.
1223 add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
1225 struct drm_device
*dev
= connector
->dev
;
1226 unsigned long est_bits
= edid
->established_timings
.t1
|
1227 (edid
->established_timings
.t2
<< 8) |
1228 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
1230 struct detailed_mode_closure closure
= {
1231 connector
, edid
, 0, 0, 0
1234 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++) {
1235 if (est_bits
& (1<<i
)) {
1236 struct drm_display_mode
*newmode
;
1237 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
1239 drm_mode_probed_add(connector
, newmode
);
1245 if (version_greater(edid
, 1, 0))
1246 drm_for_each_detailed_block((u8
*)edid
,
1247 do_established_modes
, &closure
);
1249 return modes
+ closure
.modes
;
1253 do_standard_modes(struct detailed_timing
*timing
, void *c
)
1255 struct detailed_mode_closure
*closure
= c
;
1256 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1257 struct drm_connector
*connector
= closure
->connector
;
1258 struct edid
*edid
= closure
->edid
;
1260 if (data
->type
== EDID_DETAIL_STD_MODES
) {
1262 for (i
= 0; i
< 6; i
++) {
1263 struct std_timing
*std
;
1264 struct drm_display_mode
*newmode
;
1266 std
= &data
->data
.timings
[i
];
1267 newmode
= drm_mode_std(connector
, edid
, std
,
1270 drm_mode_probed_add(connector
, newmode
);
1278 * add_standard_modes - get std. modes from EDID and add them
1279 * @edid: EDID block to scan
1281 * Standard modes can be calculated using the appropriate standard (DMT,
1282 * GTF or CVT. Grab them from @edid and add them to the list.
1285 add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
1288 struct detailed_mode_closure closure
= {
1289 connector
, edid
, 0, 0, 0
1292 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
1293 struct drm_display_mode
*newmode
;
1295 newmode
= drm_mode_std(connector
, edid
,
1296 &edid
->standard_timings
[i
],
1299 drm_mode_probed_add(connector
, newmode
);
1304 if (version_greater(edid
, 1, 0))
1305 drm_for_each_detailed_block((u8
*)edid
, do_standard_modes
,
1308 /* XXX should also look for standard codes in VTB blocks */
1310 return modes
+ closure
.modes
;
1313 static int drm_cvt_modes(struct drm_connector
*connector
,
1314 struct detailed_timing
*timing
)
1316 int i
, j
, modes
= 0;
1317 struct drm_display_mode
*newmode
;
1318 struct drm_device
*dev
= connector
->dev
;
1319 struct cvt_timing
*cvt
;
1320 const int rates
[] = { 60, 85, 75, 60, 50 };
1321 const u8 empty
[3] = { 0, 0, 0 };
1323 for (i
= 0; i
< 4; i
++) {
1324 int uninitialized_var(width
), height
;
1325 cvt
= &(timing
->data
.other_data
.data
.cvt
[i
]);
1327 if (!memcmp(cvt
->code
, empty
, 3))
1330 height
= (cvt
->code
[0] + ((cvt
->code
[1] & 0xf0) << 4) + 1) * 2;
1331 switch (cvt
->code
[1] & 0x0c) {
1333 width
= height
* 4 / 3;
1336 width
= height
* 16 / 9;
1339 width
= height
* 16 / 10;
1342 width
= height
* 15 / 9;
1346 for (j
= 1; j
< 5; j
++) {
1347 if (cvt
->code
[2] & (1 << j
)) {
1348 newmode
= drm_cvt_mode(dev
, width
, height
,
1352 drm_mode_probed_add(connector
, newmode
);
1363 do_cvt_mode(struct detailed_timing
*timing
, void *c
)
1365 struct detailed_mode_closure
*closure
= c
;
1366 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1368 if (data
->type
== EDID_DETAIL_CVT_3BYTE
)
1369 closure
->modes
+= drm_cvt_modes(closure
->connector
, timing
);
1373 add_cvt_modes(struct drm_connector
*connector
, struct edid
*edid
)
1375 struct detailed_mode_closure closure
= {
1376 connector
, edid
, 0, 0, 0
1379 if (version_greater(edid
, 1, 2))
1380 drm_for_each_detailed_block((u8
*)edid
, do_cvt_mode
, &closure
);
1382 /* XXX should also look for CVT codes in VTB blocks */
1384 return closure
.modes
;
1388 do_detailed_mode(struct detailed_timing
*timing
, void *c
)
1390 struct detailed_mode_closure
*closure
= c
;
1391 struct drm_display_mode
*newmode
;
1393 if (timing
->pixel_clock
) {
1394 newmode
= drm_mode_detailed(closure
->connector
->dev
,
1395 closure
->edid
, timing
,
1400 if (closure
->preferred
)
1401 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
1403 drm_mode_probed_add(closure
->connector
, newmode
);
1405 closure
->preferred
= 0;
1410 * add_detailed_modes - Add modes from detailed timings
1411 * @connector: attached connector
1412 * @edid: EDID block to scan
1413 * @quirks: quirks to apply
1416 add_detailed_modes(struct drm_connector
*connector
, struct edid
*edid
,
1419 struct detailed_mode_closure closure
= {
1427 if (closure
.preferred
&& !version_greater(edid
, 1, 3))
1429 (edid
->features
& DRM_EDID_FEATURE_PREFERRED_TIMING
);
1431 drm_for_each_detailed_block((u8
*)edid
, do_detailed_mode
, &closure
);
1433 return closure
.modes
;
1436 #define HDMI_IDENTIFIER 0x000C03
1437 #define AUDIO_BLOCK 0x01
1438 #define VIDEO_BLOCK 0x02
1439 #define VENDOR_BLOCK 0x03
1440 #define SPEAKER_BLOCK 0x04
1441 #define EDID_BASIC_AUDIO (1 << 6)
1442 #define EDID_CEA_YCRCB444 (1 << 5)
1443 #define EDID_CEA_YCRCB422 (1 << 4)
1446 * Search EDID for CEA extension block.
1448 u8
*drm_find_cea_extension(struct edid
*edid
)
1450 u8
*edid_ext
= NULL
;
1453 /* No EDID or EDID extensions */
1454 if (edid
== NULL
|| edid
->extensions
== 0)
1457 /* Find CEA extension */
1458 for (i
= 0; i
< edid
->extensions
; i
++) {
1459 edid_ext
= (u8
*)edid
+ EDID_LENGTH
* (i
+ 1);
1460 if (edid_ext
[0] == CEA_EXT
)
1464 if (i
== edid
->extensions
)
1469 EXPORT_SYMBOL(drm_find_cea_extension
);
1472 do_cea_modes (struct drm_connector
*connector
, u8
*db
, u8 len
)
1474 struct drm_device
*dev
= connector
->dev
;
1475 u8
* mode
, cea_mode
;
1478 for (mode
= db
; mode
< db
+ len
; mode
++) {
1479 cea_mode
= (*mode
& 127) - 1; /* CEA modes are numbered 1..127 */
1480 if (cea_mode
< drm_num_cea_modes
) {
1481 struct drm_display_mode
*newmode
;
1482 newmode
= drm_mode_duplicate(dev
,
1483 &edid_cea_modes
[cea_mode
]);
1485 drm_mode_probed_add(connector
, newmode
);
1495 add_cea_modes(struct drm_connector
*connector
, struct edid
*edid
)
1497 u8
* cea
= drm_find_cea_extension(edid
);
1501 if (cea
&& cea
[1] >= 3) {
1502 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1504 if (((db
[0] & 0xe0) >> 5) == VIDEO_BLOCK
)
1505 modes
+= do_cea_modes (connector
, db
+1, dbl
);
1513 parse_hdmi_vsdb(struct drm_connector
*connector
, uint8_t *db
)
1515 connector
->eld
[5] |= (db
[6] >> 7) << 1; /* Supports_AI */
1517 connector
->dvi_dual
= db
[6] & 1;
1518 connector
->max_tmds_clock
= db
[7] * 5;
1520 connector
->latency_present
[0] = db
[8] >> 7;
1521 connector
->latency_present
[1] = (db
[8] >> 6) & 1;
1522 connector
->video_latency
[0] = db
[9];
1523 connector
->audio_latency
[0] = db
[10];
1524 connector
->video_latency
[1] = db
[11];
1525 connector
->audio_latency
[1] = db
[12];
1527 DRM_LOG_KMS("HDMI: DVI dual %d, "
1528 "max TMDS clock %d, "
1529 "latency present %d %d, "
1530 "video latency %d %d, "
1531 "audio latency %d %d\n",
1532 connector
->dvi_dual
,
1533 connector
->max_tmds_clock
,
1534 (int) connector
->latency_present
[0],
1535 (int) connector
->latency_present
[1],
1536 connector
->video_latency
[0],
1537 connector
->video_latency
[1],
1538 connector
->audio_latency
[0],
1539 connector
->audio_latency
[1]);
1543 monitor_name(struct detailed_timing
*t
, void *data
)
1545 if (t
->data
.other_data
.type
== EDID_DETAIL_MONITOR_NAME
)
1546 *(u8
**)data
= t
->data
.other_data
.data
.str
.str
;
1550 * drm_edid_to_eld - build ELD from EDID
1551 * @connector: connector corresponding to the HDMI/DP sink
1552 * @edid: EDID to parse
1554 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1555 * Some ELD fields are left to the graphics driver caller:
1560 void drm_edid_to_eld(struct drm_connector
*connector
, struct edid
*edid
)
1562 uint8_t *eld
= connector
->eld
;
1570 memset(eld
, 0, sizeof(connector
->eld
));
1572 cea
= drm_find_cea_extension(edid
);
1574 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1579 drm_for_each_detailed_block((u8
*)edid
, monitor_name
, &name
);
1580 for (mnl
= 0; name
&& mnl
< 13; mnl
++) {
1581 if (name
[mnl
] == 0x0a)
1583 eld
[20 + mnl
] = name
[mnl
];
1585 eld
[4] = (cea
[1] << 5) | mnl
;
1586 DRM_DEBUG_KMS("ELD monitor %s\n", eld
+ 20);
1588 eld
[0] = 2 << 3; /* ELD version: 2 */
1590 eld
[16] = edid
->mfg_id
[0];
1591 eld
[17] = edid
->mfg_id
[1];
1592 eld
[18] = edid
->prod_code
[0];
1593 eld
[19] = edid
->prod_code
[1];
1596 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1599 switch ((db
[0] & 0xe0) >> 5) {
1601 /* Audio Data Block, contains SADs */
1602 sad_count
= dbl
/ 3;
1603 memcpy(eld
+ 20 + mnl
, &db
[1], dbl
);
1606 /* Speaker Allocation Data Block */
1610 /* HDMI Vendor-Specific Data Block */
1611 if (db
[1] == 0x03 && db
[2] == 0x0c && db
[3] == 0)
1612 parse_hdmi_vsdb(connector
, db
);
1618 eld
[5] |= sad_count
<< 4;
1619 eld
[2] = (20 + mnl
+ sad_count
* 3 + 3) / 4;
1621 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld
[2], sad_count
);
1623 EXPORT_SYMBOL(drm_edid_to_eld
);
1626 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1627 * @connector: connector associated with the HDMI/DP sink
1628 * @mode: the display mode
1630 int drm_av_sync_delay(struct drm_connector
*connector
,
1631 struct drm_display_mode
*mode
)
1633 int i
= !!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
);
1636 if (!connector
->latency_present
[0])
1638 if (!connector
->latency_present
[1])
1641 a
= connector
->audio_latency
[i
];
1642 v
= connector
->video_latency
[i
];
1645 * HDMI/DP sink doesn't support audio or video?
1647 if (a
== 255 || v
== 255)
1651 * Convert raw EDID values to millisecond.
1652 * Treat unknown latency as 0ms.
1655 a
= min(2 * (a
- 1), 500);
1657 v
= min(2 * (v
- 1), 500);
1659 return max(v
- a
, 0);
1661 EXPORT_SYMBOL(drm_av_sync_delay
);
1664 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1665 * @encoder: the encoder just changed display mode
1666 * @mode: the adjusted display mode
1668 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1669 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1671 struct drm_connector
*drm_select_eld(struct drm_encoder
*encoder
,
1672 struct drm_display_mode
*mode
)
1674 struct drm_connector
*connector
;
1675 struct drm_device
*dev
= encoder
->dev
;
1677 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
1678 if (connector
->encoder
== encoder
&& connector
->eld
[0])
1683 EXPORT_SYMBOL(drm_select_eld
);
1686 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1687 * @edid: monitor EDID information
1689 * Parse the CEA extension according to CEA-861-B.
1690 * Return true if HDMI, false if not or unknown.
1692 bool drm_detect_hdmi_monitor(struct edid
*edid
)
1696 int start_offset
, end_offset
;
1697 bool is_hdmi
= false;
1699 edid_ext
= drm_find_cea_extension(edid
);
1703 /* Data block offset in CEA extension block */
1705 end_offset
= edid_ext
[2];
1708 * Because HDMI identifier is in Vendor Specific Block,
1709 * search it from all data blocks of CEA extension.
1711 for (i
= start_offset
; i
< end_offset
;
1712 /* Increased by data block len */
1713 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1714 /* Find vendor specific block */
1715 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
1716 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
1717 edid_ext
[i
+ 3] << 16;
1718 /* Find HDMI identifier */
1719 if (hdmi_id
== HDMI_IDENTIFIER
)
1728 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
1731 * drm_detect_monitor_audio - check monitor audio capability
1733 * Monitor should have CEA extension block.
1734 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1735 * audio' only. If there is any audio extension block and supported
1736 * audio format, assume at least 'basic audio' support, even if 'basic
1737 * audio' is not defined in EDID.
1740 bool drm_detect_monitor_audio(struct edid
*edid
)
1744 bool has_audio
= false;
1745 int start_offset
, end_offset
;
1747 edid_ext
= drm_find_cea_extension(edid
);
1751 has_audio
= ((edid_ext
[3] & EDID_BASIC_AUDIO
) != 0);
1754 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1758 /* Data block offset in CEA extension block */
1760 end_offset
= edid_ext
[2];
1762 for (i
= start_offset
; i
< end_offset
;
1763 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1764 if ((edid_ext
[i
] >> 5) == AUDIO_BLOCK
) {
1766 for (j
= 1; j
< (edid_ext
[i
] & 0x1f); j
+= 3)
1767 DRM_DEBUG_KMS("CEA audio format %d\n",
1768 (edid_ext
[i
+ j
] >> 3) & 0xf);
1775 EXPORT_SYMBOL(drm_detect_monitor_audio
);
1778 * drm_add_display_info - pull display info out if present
1780 * @info: display info (attached to connector)
1782 * Grab any available display info and stuff it into the drm_display_info
1783 * structure that's part of the connector. Useful for tracking bpp and
1786 static void drm_add_display_info(struct edid
*edid
,
1787 struct drm_display_info
*info
)
1791 info
->width_mm
= edid
->width_cm
* 10;
1792 info
->height_mm
= edid
->height_cm
* 10;
1794 /* driver figures it out in this case */
1796 info
->color_formats
= 0;
1798 if (edid
->revision
< 3)
1801 if (!(edid
->input
& DRM_EDID_INPUT_DIGITAL
))
1804 /* Get data from CEA blocks if present */
1805 edid_ext
= drm_find_cea_extension(edid
);
1807 info
->cea_rev
= edid_ext
[1];
1809 /* The existence of a CEA block should imply RGB support */
1810 info
->color_formats
= DRM_COLOR_FORMAT_RGB444
;
1811 if (edid_ext
[3] & EDID_CEA_YCRCB444
)
1812 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB444
;
1813 if (edid_ext
[3] & EDID_CEA_YCRCB422
)
1814 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB422
;
1817 /* Only defined for 1.4 with digital displays */
1818 if (edid
->revision
< 4)
1821 switch (edid
->input
& DRM_EDID_DIGITAL_DEPTH_MASK
) {
1822 case DRM_EDID_DIGITAL_DEPTH_6
:
1825 case DRM_EDID_DIGITAL_DEPTH_8
:
1828 case DRM_EDID_DIGITAL_DEPTH_10
:
1831 case DRM_EDID_DIGITAL_DEPTH_12
:
1834 case DRM_EDID_DIGITAL_DEPTH_14
:
1837 case DRM_EDID_DIGITAL_DEPTH_16
:
1840 case DRM_EDID_DIGITAL_DEPTH_UNDEF
:
1846 info
->color_formats
|= DRM_COLOR_FORMAT_RGB444
;
1847 if (edid
->features
& DRM_EDID_FEATURE_RGB_YCRCB444
)
1848 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB444
;
1849 if (edid
->features
& DRM_EDID_FEATURE_RGB_YCRCB422
)
1850 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB422
;
1854 * drm_add_edid_modes - add modes from EDID data, if available
1855 * @connector: connector we're probing
1858 * Add the specified modes to the connector's mode list.
1860 * Return number of modes added or 0 if we couldn't find any.
1862 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
1870 if (!drm_edid_is_valid(edid
)) {
1871 dev_warn(connector
->dev
->dev
, "%s: EDID invalid.\n",
1872 drm_get_connector_name(connector
));
1876 quirks
= edid_get_quirks(edid
);
1879 * EDID spec says modes should be preferred in this order:
1880 * - preferred detailed mode
1881 * - other detailed modes from base block
1882 * - detailed modes from extension blocks
1883 * - CVT 3-byte code modes
1884 * - standard timing codes
1885 * - established timing codes
1886 * - modes inferred from GTF or CVT range information
1888 * We get this pretty much right.
1890 * XXX order for additional mode types in extension blocks?
1892 num_modes
+= add_detailed_modes(connector
, edid
, quirks
);
1893 num_modes
+= add_cvt_modes(connector
, edid
);
1894 num_modes
+= add_standard_modes(connector
, edid
);
1895 num_modes
+= add_established_modes(connector
, edid
);
1896 num_modes
+= add_inferred_modes(connector
, edid
);
1897 num_modes
+= add_cea_modes(connector
, edid
);
1899 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
1900 edid_fixup_preferred(connector
, quirks
);
1902 drm_add_display_info(edid
, &connector
->display_info
);
1906 EXPORT_SYMBOL(drm_add_edid_modes
);
1909 * drm_add_modes_noedid - add modes for the connectors without EDID
1910 * @connector: connector we're probing
1911 * @hdisplay: the horizontal display limit
1912 * @vdisplay: the vertical display limit
1914 * Add the specified modes to the connector's mode list. Only when the
1915 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1917 * Return number of modes added or 0 if we couldn't find any.
1919 int drm_add_modes_noedid(struct drm_connector
*connector
,
1920 int hdisplay
, int vdisplay
)
1922 int i
, count
, num_modes
= 0;
1923 struct drm_display_mode
*mode
;
1924 struct drm_device
*dev
= connector
->dev
;
1926 count
= sizeof(drm_dmt_modes
) / sizeof(struct drm_display_mode
);
1932 for (i
= 0; i
< count
; i
++) {
1933 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
1934 if (hdisplay
&& vdisplay
) {
1936 * Only when two are valid, they will be used to check
1937 * whether the mode should be added to the mode list of
1940 if (ptr
->hdisplay
> hdisplay
||
1941 ptr
->vdisplay
> vdisplay
)
1944 if (drm_mode_vrefresh(ptr
) > 61)
1946 mode
= drm_mode_duplicate(dev
, ptr
);
1948 drm_mode_probed_add(connector
, mode
);
1954 EXPORT_SYMBOL(drm_add_modes_noedid
);