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)
70 struct detailed_mode_closure
{
71 struct drm_connector
*connector
;
83 static struct edid_quirk
{
87 } edid_quirk_list
[] = {
89 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60
},
91 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60
},
93 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
95 /* Belinea 10 15 55 */
96 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60
},
97 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60
},
99 /* Envision Peripherals, Inc. EN-7100e */
100 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH
},
101 /* Envision EN2028 */
102 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60
},
104 /* Funai Electronics PM36B */
105 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75
|
106 EDID_QUIRK_DETAILED_IN_CM
},
108 /* LG Philips LCD LP154W01-A5 */
109 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
110 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
112 /* Philips 107p5 CRT */
113 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
116 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
118 /* Samsung SyncMaster 205BW. Note: irony */
119 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP
},
120 /* Samsung SyncMaster 22[5-6]BW */
121 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60
},
122 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60
},
125 /*** DDC fetch and block validation ***/
127 static const u8 edid_header
[] = {
128 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
132 * Sanity check the header of the base EDID block. Return 8 if the header
133 * is perfect, down to 0 if it's totally wrong.
135 int drm_edid_header_is_valid(const u8
*raw_edid
)
139 for (i
= 0; i
< sizeof(edid_header
); i
++)
140 if (raw_edid
[i
] == edid_header
[i
])
145 EXPORT_SYMBOL(drm_edid_header_is_valid
);
149 * Sanity check the EDID block (base or extension). Return 0 if the block
150 * doesn't check out, or 1 if it's valid.
152 bool drm_edid_block_valid(u8
*raw_edid
, int block
)
156 struct edid
*edid
= (struct edid
*)raw_edid
;
159 int score
= drm_edid_header_is_valid(raw_edid
);
161 else if (score
>= 6) {
162 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
163 memcpy(raw_edid
, edid_header
, sizeof(edid_header
));
169 for (i
= 0; i
< EDID_LENGTH
; i
++)
172 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum
);
174 /* allow CEA to slide through, switches mangle this */
175 if (raw_edid
[0] != 0x02)
179 /* per-block-type checks */
180 switch (raw_edid
[0]) {
182 if (edid
->version
!= 1) {
183 DRM_ERROR("EDID has major version %d, instead of 1\n", edid
->version
);
187 if (edid
->revision
> 4)
188 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
199 printk(KERN_ERR
"Raw EDID:\n");
200 print_hex_dump(KERN_ERR
, " \t", DUMP_PREFIX_NONE
, 16, 1,
201 raw_edid
, EDID_LENGTH
, false);
205 EXPORT_SYMBOL(drm_edid_block_valid
);
208 * drm_edid_is_valid - sanity check EDID data
211 * Sanity-check an entire EDID record (including extensions)
213 bool drm_edid_is_valid(struct edid
*edid
)
216 u8
*raw
= (u8
*)edid
;
221 for (i
= 0; i
<= edid
->extensions
; i
++)
222 if (!drm_edid_block_valid(raw
+ i
* EDID_LENGTH
, i
))
227 EXPORT_SYMBOL(drm_edid_is_valid
);
229 #define DDC_SEGMENT_ADDR 0x30
231 * Get EDID information via I2C.
233 * \param adapter : i2c device adaptor
234 * \param buf : EDID data buffer to be filled
235 * \param len : EDID data buffer length
236 * \return 0 on success or -1 on failure.
238 * Try to fetch EDID information by calling i2c driver function.
241 drm_do_probe_ddc_edid(struct i2c_adapter
*adapter
, unsigned char *buf
,
244 unsigned char start
= block
* EDID_LENGTH
;
245 int ret
, retries
= 5;
247 /* The core i2c driver will automatically retry the transfer if the
248 * adapter reports EAGAIN. However, we find that bit-banging transfers
249 * are susceptible to errors under a heavily loaded machine and
250 * generate spurious NAKs and timeouts. Retrying the transfer
251 * of the individual block a few times seems to overcome this.
254 struct i2c_msg msgs
[] = {
267 ret
= i2c_transfer(adapter
, msgs
, 2);
269 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
273 } while (ret
!= 2 && --retries
);
275 return ret
== 2 ? 0 : -1;
278 static bool drm_edid_is_zero(u8
*in_edid
, int length
)
281 u32
*raw_edid
= (u32
*)in_edid
;
283 for (i
= 0; i
< length
/ 4; i
++)
284 if (*(raw_edid
+ i
) != 0)
290 drm_do_get_edid(struct drm_connector
*connector
, struct i2c_adapter
*adapter
)
292 int i
, j
= 0, valid_extensions
= 0;
295 if ((block
= kmalloc(EDID_LENGTH
, GFP_KERNEL
)) == NULL
)
298 /* base block fetch */
299 for (i
= 0; i
< 4; i
++) {
300 if (drm_do_probe_ddc_edid(adapter
, block
, 0, EDID_LENGTH
))
302 if (drm_edid_block_valid(block
, 0))
304 if (i
== 0 && drm_edid_is_zero(block
, EDID_LENGTH
)) {
305 connector
->null_edid_counter
++;
312 /* if there's no extensions, we're done */
313 if (block
[0x7e] == 0)
316 new = krealloc(block
, (block
[0x7e] + 1) * EDID_LENGTH
, GFP_KERNEL
);
321 for (j
= 1; j
<= block
[0x7e]; j
++) {
322 for (i
= 0; i
< 4; i
++) {
323 if (drm_do_probe_ddc_edid(adapter
,
324 block
+ (valid_extensions
+ 1) * EDID_LENGTH
,
327 if (drm_edid_block_valid(block
+ (valid_extensions
+ 1) * EDID_LENGTH
, j
)) {
333 dev_warn(connector
->dev
->dev
,
334 "%s: Ignoring invalid EDID block %d.\n",
335 drm_get_connector_name(connector
), j
);
338 if (valid_extensions
!= block
[0x7e]) {
339 block
[EDID_LENGTH
-1] += block
[0x7e] - valid_extensions
;
340 block
[0x7e] = valid_extensions
;
341 new = krealloc(block
, (valid_extensions
+ 1) * EDID_LENGTH
, GFP_KERNEL
);
350 dev_warn(connector
->dev
->dev
, "%s: EDID block %d invalid.\n",
351 drm_get_connector_name(connector
), j
);
359 * Probe DDC presence.
361 * \param adapter : i2c device adaptor
362 * \return 1 on success
365 drm_probe_ddc(struct i2c_adapter
*adapter
)
369 return (drm_do_probe_ddc_edid(adapter
, &out
, 0, 1) == 0);
373 * drm_get_edid - get EDID data, if available
374 * @connector: connector we're probing
375 * @adapter: i2c adapter to use for DDC
377 * Poke the given i2c channel to grab EDID data if possible. If found,
378 * attach it to the connector.
380 * Return edid data or NULL if we couldn't find any.
382 struct edid
*drm_get_edid(struct drm_connector
*connector
,
383 struct i2c_adapter
*adapter
)
385 struct edid
*edid
= NULL
;
387 if (drm_probe_ddc(adapter
))
388 edid
= (struct edid
*)drm_do_get_edid(connector
, adapter
);
390 connector
->display_info
.raw_edid
= (char *)edid
;
395 EXPORT_SYMBOL(drm_get_edid
);
397 /*** EDID parsing ***/
400 * edid_vendor - match a string against EDID's obfuscated vendor field
401 * @edid: EDID to match
402 * @vendor: vendor string
404 * Returns true if @vendor is in @edid, false otherwise
406 static bool edid_vendor(struct edid
*edid
, char *vendor
)
410 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
411 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
412 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
413 edid_vendor
[2] = (edid
->mfg_id
[1] & 0x1f) + '@';
415 return !strncmp(edid_vendor
, vendor
, 3);
419 * edid_get_quirks - return quirk flags for a given EDID
420 * @edid: EDID to process
422 * This tells subsequent routines what fixes they need to apply.
424 static u32
edid_get_quirks(struct edid
*edid
)
426 struct edid_quirk
*quirk
;
429 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
430 quirk
= &edid_quirk_list
[i
];
432 if (edid_vendor(edid
, quirk
->vendor
) &&
433 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
434 return quirk
->quirks
;
440 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
441 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
444 * edid_fixup_preferred - set preferred modes based on quirk list
445 * @connector: has mode list to fix up
446 * @quirks: quirks list
448 * Walk the mode list for @connector, clearing the preferred status
449 * on existing modes and setting it anew for the right mode ala @quirks.
451 static void edid_fixup_preferred(struct drm_connector
*connector
,
454 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
455 int target_refresh
= 0;
457 if (list_empty(&connector
->probed_modes
))
460 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
462 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
465 preferred_mode
= list_first_entry(&connector
->probed_modes
,
466 struct drm_display_mode
, head
);
468 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
469 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
471 if (cur_mode
== preferred_mode
)
474 /* Largest mode is preferred */
475 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
476 preferred_mode
= cur_mode
;
478 /* At a given size, try to get closest to target refresh */
479 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
480 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
481 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
482 preferred_mode
= cur_mode
;
486 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
490 mode_is_rb(const struct drm_display_mode
*mode
)
492 return (mode
->htotal
- mode
->hdisplay
== 160) &&
493 (mode
->hsync_end
- mode
->hdisplay
== 80) &&
494 (mode
->hsync_end
- mode
->hsync_start
== 32) &&
495 (mode
->vsync_start
- mode
->vdisplay
== 3);
499 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
500 * @dev: Device to duplicate against
502 * @vsize: Mode height
503 * @fresh: Mode refresh rate
504 * @rb: Mode reduced-blanking-ness
506 * Walk the DMT mode list looking for a match for the given parameters.
507 * Return a newly allocated copy of the mode, or NULL if not found.
509 struct drm_display_mode
*drm_mode_find_dmt(struct drm_device
*dev
,
510 int hsize
, int vsize
, int fresh
,
515 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
516 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
517 if (hsize
!= ptr
->hdisplay
)
519 if (vsize
!= ptr
->vdisplay
)
521 if (fresh
!= drm_mode_vrefresh(ptr
))
523 if (rb
!= mode_is_rb(ptr
))
526 return drm_mode_duplicate(dev
, ptr
);
531 EXPORT_SYMBOL(drm_mode_find_dmt
);
533 typedef void detailed_cb(struct detailed_timing
*timing
, void *closure
);
536 cea_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
540 u8
*det_base
= ext
+ d
;
543 for (i
= 0; i
< n
; i
++)
544 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
548 vtb_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
550 unsigned int i
, n
= min((int)ext
[0x02], 6);
551 u8
*det_base
= ext
+ 5;
554 return; /* unknown version */
556 for (i
= 0; i
< n
; i
++)
557 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
561 drm_for_each_detailed_block(u8
*raw_edid
, detailed_cb
*cb
, void *closure
)
564 struct edid
*edid
= (struct edid
*)raw_edid
;
569 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++)
570 cb(&(edid
->detailed_timings
[i
]), closure
);
572 for (i
= 1; i
<= raw_edid
[0x7e]; i
++) {
573 u8
*ext
= raw_edid
+ (i
* EDID_LENGTH
);
576 cea_for_each_detailed_block(ext
, cb
, closure
);
579 vtb_for_each_detailed_block(ext
, cb
, closure
);
588 is_rb(struct detailed_timing
*t
, void *data
)
591 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
)
593 *(bool *)data
= true;
596 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
598 drm_monitor_supports_rb(struct edid
*edid
)
600 if (edid
->revision
>= 4) {
602 drm_for_each_detailed_block((u8
*)edid
, is_rb
, &ret
);
606 return ((edid
->input
& DRM_EDID_INPUT_DIGITAL
) != 0);
610 find_gtf2(struct detailed_timing
*t
, void *data
)
613 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
&& r
[10] == 0x02)
617 /* Secondary GTF curve kicks in above some break frequency */
619 drm_gtf2_hbreak(struct edid
*edid
)
622 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
623 return r
? (r
[12] * 2) : 0;
627 drm_gtf2_2c(struct edid
*edid
)
630 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
631 return r
? r
[13] : 0;
635 drm_gtf2_m(struct edid
*edid
)
638 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
639 return r
? (r
[15] << 8) + r
[14] : 0;
643 drm_gtf2_k(struct edid
*edid
)
646 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
647 return r
? r
[16] : 0;
651 drm_gtf2_2j(struct edid
*edid
)
654 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
655 return r
? r
[17] : 0;
659 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
660 * @edid: EDID block to scan
662 static int standard_timing_level(struct edid
*edid
)
664 if (edid
->revision
>= 2) {
665 if (edid
->revision
>= 4 && (edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
))
667 if (drm_gtf2_hbreak(edid
))
675 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
676 * monitors fill with ascii space (0x20) instead.
679 bad_std_timing(u8 a
, u8 b
)
681 return (a
== 0x00 && b
== 0x00) ||
682 (a
== 0x01 && b
== 0x01) ||
683 (a
== 0x20 && b
== 0x20);
687 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
688 * @t: standard timing params
689 * @timing_level: standard timing level
691 * Take the standard timing params (in this case width, aspect, and refresh)
692 * and convert them into a real mode using CVT/GTF/DMT.
694 static struct drm_display_mode
*
695 drm_mode_std(struct drm_connector
*connector
, struct edid
*edid
,
696 struct std_timing
*t
, int revision
)
698 struct drm_device
*dev
= connector
->dev
;
699 struct drm_display_mode
*m
, *mode
= NULL
;
702 unsigned aspect_ratio
= (t
->vfreq_aspect
& EDID_TIMING_ASPECT_MASK
)
703 >> EDID_TIMING_ASPECT_SHIFT
;
704 unsigned vfreq
= (t
->vfreq_aspect
& EDID_TIMING_VFREQ_MASK
)
705 >> EDID_TIMING_VFREQ_SHIFT
;
706 int timing_level
= standard_timing_level(edid
);
708 if (bad_std_timing(t
->hsize
, t
->vfreq_aspect
))
711 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
712 hsize
= t
->hsize
* 8 + 248;
713 /* vrefresh_rate = vfreq + 60 */
714 vrefresh_rate
= vfreq
+ 60;
715 /* the vdisplay is calculated based on the aspect ratio */
716 if (aspect_ratio
== 0) {
720 vsize
= (hsize
* 10) / 16;
721 } else if (aspect_ratio
== 1)
722 vsize
= (hsize
* 3) / 4;
723 else if (aspect_ratio
== 2)
724 vsize
= (hsize
* 4) / 5;
726 vsize
= (hsize
* 9) / 16;
728 /* HDTV hack, part 1 */
729 if (vrefresh_rate
== 60 &&
730 ((hsize
== 1360 && vsize
== 765) ||
731 (hsize
== 1368 && vsize
== 769))) {
737 * If this connector already has a mode for this size and refresh
738 * rate (because it came from detailed or CVT info), use that
739 * instead. This way we don't have to guess at interlace or
742 list_for_each_entry(m
, &connector
->probed_modes
, head
)
743 if (m
->hdisplay
== hsize
&& m
->vdisplay
== vsize
&&
744 drm_mode_vrefresh(m
) == vrefresh_rate
)
747 /* HDTV hack, part 2 */
748 if (hsize
== 1366 && vsize
== 768 && vrefresh_rate
== 60) {
749 mode
= drm_cvt_mode(dev
, 1366, 768, vrefresh_rate
, 0, 0,
751 mode
->hdisplay
= 1366;
752 mode
->hsync_start
= mode
->hsync_start
- 1;
753 mode
->hsync_end
= mode
->hsync_end
- 1;
757 /* check whether it can be found in default mode table */
758 if (drm_monitor_supports_rb(edid
)) {
759 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
,
764 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
, false);
768 /* okay, generate it */
769 switch (timing_level
) {
773 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
777 * This is potentially wrong if there's ever a monitor with
778 * more than one ranges section, each claiming a different
779 * secondary GTF curve. Please don't do that.
781 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
784 if (drm_mode_hsync(mode
) > drm_gtf2_hbreak(edid
)) {
785 drm_mode_destroy(dev
, mode
);
786 mode
= drm_gtf_mode_complex(dev
, hsize
, vsize
,
795 mode
= drm_cvt_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0,
803 * EDID is delightfully ambiguous about how interlaced modes are to be
804 * encoded. Our internal representation is of frame height, but some
805 * HDTV detailed timings are encoded as field height.
807 * The format list here is from CEA, in frame size. Technically we
808 * should be checking refresh rate too. Whatever.
811 drm_mode_do_interlace_quirk(struct drm_display_mode
*mode
,
812 struct detailed_pixel_timing
*pt
)
815 static const struct {
817 } cea_interlaced
[] = {
827 if (!(pt
->misc
& DRM_EDID_PT_INTERLACED
))
830 for (i
= 0; i
< ARRAY_SIZE(cea_interlaced
); i
++) {
831 if ((mode
->hdisplay
== cea_interlaced
[i
].w
) &&
832 (mode
->vdisplay
== cea_interlaced
[i
].h
/ 2)) {
834 mode
->vsync_start
*= 2;
835 mode
->vsync_end
*= 2;
841 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
845 * drm_mode_detailed - create a new mode from an EDID detailed timing section
846 * @dev: DRM device (needed to create new mode)
848 * @timing: EDID detailed timing info
849 * @quirks: quirks to apply
851 * An EDID detailed timing block contains enough info for us to create and
852 * return a new struct drm_display_mode.
854 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
856 struct detailed_timing
*timing
,
859 struct drm_display_mode
*mode
;
860 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
861 unsigned hactive
= (pt
->hactive_hblank_hi
& 0xf0) << 4 | pt
->hactive_lo
;
862 unsigned vactive
= (pt
->vactive_vblank_hi
& 0xf0) << 4 | pt
->vactive_lo
;
863 unsigned hblank
= (pt
->hactive_hblank_hi
& 0xf) << 8 | pt
->hblank_lo
;
864 unsigned vblank
= (pt
->vactive_vblank_hi
& 0xf) << 8 | pt
->vblank_lo
;
865 unsigned hsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc0) << 2 | pt
->hsync_offset_lo
;
866 unsigned hsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x30) << 4 | pt
->hsync_pulse_width_lo
;
867 unsigned vsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc) >> 2 | pt
->vsync_offset_pulse_width_lo
>> 4;
868 unsigned vsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x3) << 4 | (pt
->vsync_offset_pulse_width_lo
& 0xf);
870 /* ignore tiny modes */
871 if (hactive
< 64 || vactive
< 64)
874 if (pt
->misc
& DRM_EDID_PT_STEREO
) {
875 printk(KERN_WARNING
"stereo mode not supported\n");
878 if (!(pt
->misc
& DRM_EDID_PT_SEPARATE_SYNC
)) {
879 printk(KERN_WARNING
"composite sync not supported\n");
882 /* it is incorrect if hsync/vsync width is zero */
883 if (!hsync_pulse_width
|| !vsync_pulse_width
) {
884 DRM_DEBUG_KMS("Incorrect Detailed timing. "
885 "Wrong Hsync/Vsync pulse width\n");
888 mode
= drm_mode_create(dev
);
892 mode
->type
= DRM_MODE_TYPE_DRIVER
;
894 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
895 timing
->pixel_clock
= cpu_to_le16(1088);
897 mode
->clock
= le16_to_cpu(timing
->pixel_clock
) * 10;
899 mode
->hdisplay
= hactive
;
900 mode
->hsync_start
= mode
->hdisplay
+ hsync_offset
;
901 mode
->hsync_end
= mode
->hsync_start
+ hsync_pulse_width
;
902 mode
->htotal
= mode
->hdisplay
+ hblank
;
904 mode
->vdisplay
= vactive
;
905 mode
->vsync_start
= mode
->vdisplay
+ vsync_offset
;
906 mode
->vsync_end
= mode
->vsync_start
+ vsync_pulse_width
;
907 mode
->vtotal
= mode
->vdisplay
+ vblank
;
909 /* Some EDIDs have bogus h/vtotal values */
910 if (mode
->hsync_end
> mode
->htotal
)
911 mode
->htotal
= mode
->hsync_end
+ 1;
912 if (mode
->vsync_end
> mode
->vtotal
)
913 mode
->vtotal
= mode
->vsync_end
+ 1;
915 drm_mode_do_interlace_quirk(mode
, pt
);
917 drm_mode_set_name(mode
);
919 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
920 pt
->misc
|= DRM_EDID_PT_HSYNC_POSITIVE
| DRM_EDID_PT_VSYNC_POSITIVE
;
923 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_HSYNC_POSITIVE
) ?
924 DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
925 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_VSYNC_POSITIVE
) ?
926 DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
928 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_height_mm_hi
& 0xf0) << 4;
929 mode
->height_mm
= pt
->height_mm_lo
| (pt
->width_height_mm_hi
& 0xf) << 8;
931 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
932 mode
->width_mm
*= 10;
933 mode
->height_mm
*= 10;
936 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
937 mode
->width_mm
= edid
->width_cm
* 10;
938 mode
->height_mm
= edid
->height_cm
* 10;
945 mode_in_hsync_range(const struct drm_display_mode
*mode
,
946 struct edid
*edid
, u8
*t
)
948 int hsync
, hmin
, hmax
;
951 if (edid
->revision
>= 4)
952 hmin
+= ((t
[4] & 0x04) ? 255 : 0);
954 if (edid
->revision
>= 4)
955 hmax
+= ((t
[4] & 0x08) ? 255 : 0);
956 hsync
= drm_mode_hsync(mode
);
958 return (hsync
<= hmax
&& hsync
>= hmin
);
962 mode_in_vsync_range(const struct drm_display_mode
*mode
,
963 struct edid
*edid
, u8
*t
)
965 int vsync
, vmin
, vmax
;
968 if (edid
->revision
>= 4)
969 vmin
+= ((t
[4] & 0x01) ? 255 : 0);
971 if (edid
->revision
>= 4)
972 vmax
+= ((t
[4] & 0x02) ? 255 : 0);
973 vsync
= drm_mode_vrefresh(mode
);
975 return (vsync
<= vmax
&& vsync
>= vmin
);
979 range_pixel_clock(struct edid
*edid
, u8
*t
)
982 if (t
[9] == 0 || t
[9] == 255)
985 /* 1.4 with CVT support gives us real precision, yay */
986 if (edid
->revision
>= 4 && t
[10] == 0x04)
987 return (t
[9] * 10000) - ((t
[12] >> 2) * 250);
989 /* 1.3 is pathetic, so fuzz up a bit */
990 return t
[9] * 10000 + 5001;
994 mode_in_range(const struct drm_display_mode
*mode
, struct edid
*edid
,
995 struct detailed_timing
*timing
)
998 u8
*t
= (u8
*)timing
;
1000 if (!mode_in_hsync_range(mode
, edid
, t
))
1003 if (!mode_in_vsync_range(mode
, edid
, t
))
1006 if ((max_clock
= range_pixel_clock(edid
, t
)))
1007 if (mode
->clock
> max_clock
)
1010 /* 1.4 max horizontal check */
1011 if (edid
->revision
>= 4 && t
[10] == 0x04)
1012 if (t
[13] && mode
->hdisplay
> 8 * (t
[13] + (256 * (t
[12]&0x3))))
1015 if (mode_is_rb(mode
) && !drm_monitor_supports_rb(edid
))
1022 drm_dmt_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1023 struct detailed_timing
*timing
)
1026 struct drm_display_mode
*newmode
;
1027 struct drm_device
*dev
= connector
->dev
;
1029 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
1030 if (mode_in_range(drm_dmt_modes
+ i
, edid
, timing
)) {
1031 newmode
= drm_mode_duplicate(dev
, &drm_dmt_modes
[i
]);
1033 drm_mode_probed_add(connector
, newmode
);
1042 /* fix up 1366x768 mode from 1368x768;
1043 * GFT/CVT can't express 1366 width which isn't dividable by 8
1045 static void fixup_mode_1366x768(struct drm_display_mode
*mode
)
1047 if (mode
->hdisplay
== 1368 && mode
->vdisplay
== 768) {
1048 mode
->hdisplay
= 1366;
1049 mode
->hsync_start
--;
1051 drm_mode_set_name(mode
);
1056 drm_gtf_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1057 struct detailed_timing
*timing
)
1060 struct drm_display_mode
*newmode
;
1061 struct drm_device
*dev
= connector
->dev
;
1063 for (i
= 0; i
< num_extra_modes
; i
++) {
1064 const struct minimode
*m
= &extra_modes
[i
];
1065 newmode
= drm_gtf_mode(dev
, m
->w
, m
->h
, m
->r
, 0, 0);
1069 fixup_mode_1366x768(newmode
);
1070 if (!mode_in_range(newmode
, edid
, timing
)) {
1071 drm_mode_destroy(dev
, newmode
);
1075 drm_mode_probed_add(connector
, newmode
);
1083 drm_cvt_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1084 struct detailed_timing
*timing
)
1087 struct drm_display_mode
*newmode
;
1088 struct drm_device
*dev
= connector
->dev
;
1089 bool rb
= drm_monitor_supports_rb(edid
);
1091 for (i
= 0; i
< num_extra_modes
; i
++) {
1092 const struct minimode
*m
= &extra_modes
[i
];
1093 newmode
= drm_cvt_mode(dev
, m
->w
, m
->h
, m
->r
, rb
, 0, 0);
1097 fixup_mode_1366x768(newmode
);
1098 if (!mode_in_range(newmode
, edid
, timing
)) {
1099 drm_mode_destroy(dev
, newmode
);
1103 drm_mode_probed_add(connector
, newmode
);
1111 do_inferred_modes(struct detailed_timing
*timing
, void *c
)
1113 struct detailed_mode_closure
*closure
= c
;
1114 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1115 struct detailed_data_monitor_range
*range
= &data
->data
.range
;
1117 if (data
->type
!= EDID_DETAIL_MONITOR_RANGE
)
1120 closure
->modes
+= drm_dmt_modes_for_range(closure
->connector
,
1124 if (!version_greater(closure
->edid
, 1, 1))
1125 return; /* GTF not defined yet */
1127 switch (range
->flags
) {
1128 case 0x02: /* secondary gtf, XXX could do more */
1129 case 0x00: /* default gtf */
1130 closure
->modes
+= drm_gtf_modes_for_range(closure
->connector
,
1134 case 0x04: /* cvt, only in 1.4+ */
1135 if (!version_greater(closure
->edid
, 1, 3))
1138 closure
->modes
+= drm_cvt_modes_for_range(closure
->connector
,
1142 case 0x01: /* just the ranges, no formula */
1149 add_inferred_modes(struct drm_connector
*connector
, struct edid
*edid
)
1151 struct detailed_mode_closure closure
= {
1152 connector
, edid
, 0, 0, 0
1155 if (version_greater(edid
, 1, 0))
1156 drm_for_each_detailed_block((u8
*)edid
, do_inferred_modes
,
1159 return closure
.modes
;
1163 drm_est3_modes(struct drm_connector
*connector
, struct detailed_timing
*timing
)
1165 int i
, j
, m
, modes
= 0;
1166 struct drm_display_mode
*mode
;
1167 u8
*est
= ((u8
*)timing
) + 5;
1169 for (i
= 0; i
< 6; i
++) {
1170 for (j
= 7; j
> 0; j
--) {
1171 m
= (i
* 8) + (7 - j
);
1172 if (m
>= ARRAY_SIZE(est3_modes
))
1174 if (est
[i
] & (1 << j
)) {
1175 mode
= drm_mode_find_dmt(connector
->dev
,
1181 drm_mode_probed_add(connector
, mode
);
1192 do_established_modes(struct detailed_timing
*timing
, void *c
)
1194 struct detailed_mode_closure
*closure
= c
;
1195 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1197 if (data
->type
== EDID_DETAIL_EST_TIMINGS
)
1198 closure
->modes
+= drm_est3_modes(closure
->connector
, timing
);
1202 * add_established_modes - get est. modes from EDID and add them
1203 * @edid: EDID block to scan
1205 * Each EDID block contains a bitmap of the supported "established modes" list
1206 * (defined above). Tease them out and add them to the global modes list.
1209 add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
1211 struct drm_device
*dev
= connector
->dev
;
1212 unsigned long est_bits
= edid
->established_timings
.t1
|
1213 (edid
->established_timings
.t2
<< 8) |
1214 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
1216 struct detailed_mode_closure closure
= {
1217 connector
, edid
, 0, 0, 0
1220 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++) {
1221 if (est_bits
& (1<<i
)) {
1222 struct drm_display_mode
*newmode
;
1223 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
1225 drm_mode_probed_add(connector
, newmode
);
1231 if (version_greater(edid
, 1, 0))
1232 drm_for_each_detailed_block((u8
*)edid
,
1233 do_established_modes
, &closure
);
1235 return modes
+ closure
.modes
;
1239 do_standard_modes(struct detailed_timing
*timing
, void *c
)
1241 struct detailed_mode_closure
*closure
= c
;
1242 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1243 struct drm_connector
*connector
= closure
->connector
;
1244 struct edid
*edid
= closure
->edid
;
1246 if (data
->type
== EDID_DETAIL_STD_MODES
) {
1248 for (i
= 0; i
< 6; i
++) {
1249 struct std_timing
*std
;
1250 struct drm_display_mode
*newmode
;
1252 std
= &data
->data
.timings
[i
];
1253 newmode
= drm_mode_std(connector
, edid
, std
,
1256 drm_mode_probed_add(connector
, newmode
);
1264 * add_standard_modes - get std. modes from EDID and add them
1265 * @edid: EDID block to scan
1267 * Standard modes can be calculated using the appropriate standard (DMT,
1268 * GTF or CVT. Grab them from @edid and add them to the list.
1271 add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
1274 struct detailed_mode_closure closure
= {
1275 connector
, edid
, 0, 0, 0
1278 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
1279 struct drm_display_mode
*newmode
;
1281 newmode
= drm_mode_std(connector
, edid
,
1282 &edid
->standard_timings
[i
],
1285 drm_mode_probed_add(connector
, newmode
);
1290 if (version_greater(edid
, 1, 0))
1291 drm_for_each_detailed_block((u8
*)edid
, do_standard_modes
,
1294 /* XXX should also look for standard codes in VTB blocks */
1296 return modes
+ closure
.modes
;
1299 static int drm_cvt_modes(struct drm_connector
*connector
,
1300 struct detailed_timing
*timing
)
1302 int i
, j
, modes
= 0;
1303 struct drm_display_mode
*newmode
;
1304 struct drm_device
*dev
= connector
->dev
;
1305 struct cvt_timing
*cvt
;
1306 const int rates
[] = { 60, 85, 75, 60, 50 };
1307 const u8 empty
[3] = { 0, 0, 0 };
1309 for (i
= 0; i
< 4; i
++) {
1310 int uninitialized_var(width
), height
;
1311 cvt
= &(timing
->data
.other_data
.data
.cvt
[i
]);
1313 if (!memcmp(cvt
->code
, empty
, 3))
1316 height
= (cvt
->code
[0] + ((cvt
->code
[1] & 0xf0) << 4) + 1) * 2;
1317 switch (cvt
->code
[1] & 0x0c) {
1319 width
= height
* 4 / 3;
1322 width
= height
* 16 / 9;
1325 width
= height
* 16 / 10;
1328 width
= height
* 15 / 9;
1332 for (j
= 1; j
< 5; j
++) {
1333 if (cvt
->code
[2] & (1 << j
)) {
1334 newmode
= drm_cvt_mode(dev
, width
, height
,
1338 drm_mode_probed_add(connector
, newmode
);
1349 do_cvt_mode(struct detailed_timing
*timing
, void *c
)
1351 struct detailed_mode_closure
*closure
= c
;
1352 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1354 if (data
->type
== EDID_DETAIL_CVT_3BYTE
)
1355 closure
->modes
+= drm_cvt_modes(closure
->connector
, timing
);
1359 add_cvt_modes(struct drm_connector
*connector
, struct edid
*edid
)
1361 struct detailed_mode_closure closure
= {
1362 connector
, edid
, 0, 0, 0
1365 if (version_greater(edid
, 1, 2))
1366 drm_for_each_detailed_block((u8
*)edid
, do_cvt_mode
, &closure
);
1368 /* XXX should also look for CVT codes in VTB blocks */
1370 return closure
.modes
;
1374 do_detailed_mode(struct detailed_timing
*timing
, void *c
)
1376 struct detailed_mode_closure
*closure
= c
;
1377 struct drm_display_mode
*newmode
;
1379 if (timing
->pixel_clock
) {
1380 newmode
= drm_mode_detailed(closure
->connector
->dev
,
1381 closure
->edid
, timing
,
1386 if (closure
->preferred
)
1387 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
1389 drm_mode_probed_add(closure
->connector
, newmode
);
1391 closure
->preferred
= 0;
1396 * add_detailed_modes - Add modes from detailed timings
1397 * @connector: attached connector
1398 * @edid: EDID block to scan
1399 * @quirks: quirks to apply
1402 add_detailed_modes(struct drm_connector
*connector
, struct edid
*edid
,
1405 struct detailed_mode_closure closure
= {
1413 if (closure
.preferred
&& !version_greater(edid
, 1, 3))
1415 (edid
->features
& DRM_EDID_FEATURE_PREFERRED_TIMING
);
1417 drm_for_each_detailed_block((u8
*)edid
, do_detailed_mode
, &closure
);
1419 return closure
.modes
;
1422 #define HDMI_IDENTIFIER 0x000C03
1423 #define AUDIO_BLOCK 0x01
1424 #define VIDEO_BLOCK 0x02
1425 #define VENDOR_BLOCK 0x03
1426 #define SPEAKER_BLOCK 0x04
1427 #define EDID_BASIC_AUDIO (1 << 6)
1428 #define EDID_CEA_YCRCB444 (1 << 5)
1429 #define EDID_CEA_YCRCB422 (1 << 4)
1432 * Search EDID for CEA extension block.
1434 u8
*drm_find_cea_extension(struct edid
*edid
)
1436 u8
*edid_ext
= NULL
;
1439 /* No EDID or EDID extensions */
1440 if (edid
== NULL
|| edid
->extensions
== 0)
1443 /* Find CEA extension */
1444 for (i
= 0; i
< edid
->extensions
; i
++) {
1445 edid_ext
= (u8
*)edid
+ EDID_LENGTH
* (i
+ 1);
1446 if (edid_ext
[0] == CEA_EXT
)
1450 if (i
== edid
->extensions
)
1455 EXPORT_SYMBOL(drm_find_cea_extension
);
1458 do_cea_modes (struct drm_connector
*connector
, u8
*db
, u8 len
)
1460 struct drm_device
*dev
= connector
->dev
;
1461 u8
* mode
, cea_mode
;
1464 for (mode
= db
; mode
< db
+ len
; mode
++) {
1465 cea_mode
= (*mode
& 127) - 1; /* CEA modes are numbered 1..127 */
1466 if (cea_mode
< drm_num_cea_modes
) {
1467 struct drm_display_mode
*newmode
;
1468 newmode
= drm_mode_duplicate(dev
,
1469 &edid_cea_modes
[cea_mode
]);
1471 drm_mode_probed_add(connector
, newmode
);
1481 add_cea_modes(struct drm_connector
*connector
, struct edid
*edid
)
1483 u8
* cea
= drm_find_cea_extension(edid
);
1487 if (cea
&& cea
[1] >= 3) {
1488 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1490 if (((db
[0] & 0xe0) >> 5) == VIDEO_BLOCK
)
1491 modes
+= do_cea_modes (connector
, db
+1, dbl
);
1499 parse_hdmi_vsdb(struct drm_connector
*connector
, uint8_t *db
)
1501 connector
->eld
[5] |= (db
[6] >> 7) << 1; /* Supports_AI */
1503 connector
->dvi_dual
= db
[6] & 1;
1504 connector
->max_tmds_clock
= db
[7] * 5;
1506 connector
->latency_present
[0] = db
[8] >> 7;
1507 connector
->latency_present
[1] = (db
[8] >> 6) & 1;
1508 connector
->video_latency
[0] = db
[9];
1509 connector
->audio_latency
[0] = db
[10];
1510 connector
->video_latency
[1] = db
[11];
1511 connector
->audio_latency
[1] = db
[12];
1513 DRM_LOG_KMS("HDMI: DVI dual %d, "
1514 "max TMDS clock %d, "
1515 "latency present %d %d, "
1516 "video latency %d %d, "
1517 "audio latency %d %d\n",
1518 connector
->dvi_dual
,
1519 connector
->max_tmds_clock
,
1520 (int) connector
->latency_present
[0],
1521 (int) connector
->latency_present
[1],
1522 connector
->video_latency
[0],
1523 connector
->video_latency
[1],
1524 connector
->audio_latency
[0],
1525 connector
->audio_latency
[1]);
1529 monitor_name(struct detailed_timing
*t
, void *data
)
1531 if (t
->data
.other_data
.type
== EDID_DETAIL_MONITOR_NAME
)
1532 *(u8
**)data
= t
->data
.other_data
.data
.str
.str
;
1536 * drm_edid_to_eld - build ELD from EDID
1537 * @connector: connector corresponding to the HDMI/DP sink
1538 * @edid: EDID to parse
1540 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1541 * Some ELD fields are left to the graphics driver caller:
1546 void drm_edid_to_eld(struct drm_connector
*connector
, struct edid
*edid
)
1548 uint8_t *eld
= connector
->eld
;
1556 memset(eld
, 0, sizeof(connector
->eld
));
1558 cea
= drm_find_cea_extension(edid
);
1560 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1565 drm_for_each_detailed_block((u8
*)edid
, monitor_name
, &name
);
1566 for (mnl
= 0; name
&& mnl
< 13; mnl
++) {
1567 if (name
[mnl
] == 0x0a)
1569 eld
[20 + mnl
] = name
[mnl
];
1571 eld
[4] = (cea
[1] << 5) | mnl
;
1572 DRM_DEBUG_KMS("ELD monitor %s\n", eld
+ 20);
1574 eld
[0] = 2 << 3; /* ELD version: 2 */
1576 eld
[16] = edid
->mfg_id
[0];
1577 eld
[17] = edid
->mfg_id
[1];
1578 eld
[18] = edid
->prod_code
[0];
1579 eld
[19] = edid
->prod_code
[1];
1582 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1585 switch ((db
[0] & 0xe0) >> 5) {
1587 /* Audio Data Block, contains SADs */
1588 sad_count
= dbl
/ 3;
1589 memcpy(eld
+ 20 + mnl
, &db
[1], dbl
);
1592 /* Speaker Allocation Data Block */
1596 /* HDMI Vendor-Specific Data Block */
1597 if (db
[1] == 0x03 && db
[2] == 0x0c && db
[3] == 0)
1598 parse_hdmi_vsdb(connector
, db
);
1604 eld
[5] |= sad_count
<< 4;
1605 eld
[2] = (20 + mnl
+ sad_count
* 3 + 3) / 4;
1607 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld
[2], sad_count
);
1609 EXPORT_SYMBOL(drm_edid_to_eld
);
1612 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1613 * @connector: connector associated with the HDMI/DP sink
1614 * @mode: the display mode
1616 int drm_av_sync_delay(struct drm_connector
*connector
,
1617 struct drm_display_mode
*mode
)
1619 int i
= !!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
);
1622 if (!connector
->latency_present
[0])
1624 if (!connector
->latency_present
[1])
1627 a
= connector
->audio_latency
[i
];
1628 v
= connector
->video_latency
[i
];
1631 * HDMI/DP sink doesn't support audio or video?
1633 if (a
== 255 || v
== 255)
1637 * Convert raw EDID values to millisecond.
1638 * Treat unknown latency as 0ms.
1641 a
= min(2 * (a
- 1), 500);
1643 v
= min(2 * (v
- 1), 500);
1645 return max(v
- a
, 0);
1647 EXPORT_SYMBOL(drm_av_sync_delay
);
1650 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1651 * @encoder: the encoder just changed display mode
1652 * @mode: the adjusted display mode
1654 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1655 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1657 struct drm_connector
*drm_select_eld(struct drm_encoder
*encoder
,
1658 struct drm_display_mode
*mode
)
1660 struct drm_connector
*connector
;
1661 struct drm_device
*dev
= encoder
->dev
;
1663 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
1664 if (connector
->encoder
== encoder
&& connector
->eld
[0])
1669 EXPORT_SYMBOL(drm_select_eld
);
1672 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1673 * @edid: monitor EDID information
1675 * Parse the CEA extension according to CEA-861-B.
1676 * Return true if HDMI, false if not or unknown.
1678 bool drm_detect_hdmi_monitor(struct edid
*edid
)
1682 int start_offset
, end_offset
;
1683 bool is_hdmi
= false;
1685 edid_ext
= drm_find_cea_extension(edid
);
1689 /* Data block offset in CEA extension block */
1691 end_offset
= edid_ext
[2];
1694 * Because HDMI identifier is in Vendor Specific Block,
1695 * search it from all data blocks of CEA extension.
1697 for (i
= start_offset
; i
< end_offset
;
1698 /* Increased by data block len */
1699 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1700 /* Find vendor specific block */
1701 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
1702 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
1703 edid_ext
[i
+ 3] << 16;
1704 /* Find HDMI identifier */
1705 if (hdmi_id
== HDMI_IDENTIFIER
)
1714 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
1717 * drm_detect_monitor_audio - check monitor audio capability
1719 * Monitor should have CEA extension block.
1720 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1721 * audio' only. If there is any audio extension block and supported
1722 * audio format, assume at least 'basic audio' support, even if 'basic
1723 * audio' is not defined in EDID.
1726 bool drm_detect_monitor_audio(struct edid
*edid
)
1730 bool has_audio
= false;
1731 int start_offset
, end_offset
;
1733 edid_ext
= drm_find_cea_extension(edid
);
1737 has_audio
= ((edid_ext
[3] & EDID_BASIC_AUDIO
) != 0);
1740 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1744 /* Data block offset in CEA extension block */
1746 end_offset
= edid_ext
[2];
1748 for (i
= start_offset
; i
< end_offset
;
1749 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1750 if ((edid_ext
[i
] >> 5) == AUDIO_BLOCK
) {
1752 for (j
= 1; j
< (edid_ext
[i
] & 0x1f); j
+= 3)
1753 DRM_DEBUG_KMS("CEA audio format %d\n",
1754 (edid_ext
[i
+ j
] >> 3) & 0xf);
1761 EXPORT_SYMBOL(drm_detect_monitor_audio
);
1764 * drm_add_display_info - pull display info out if present
1766 * @info: display info (attached to connector)
1768 * Grab any available display info and stuff it into the drm_display_info
1769 * structure that's part of the connector. Useful for tracking bpp and
1772 static void drm_add_display_info(struct edid
*edid
,
1773 struct drm_display_info
*info
)
1777 info
->width_mm
= edid
->width_cm
* 10;
1778 info
->height_mm
= edid
->height_cm
* 10;
1780 /* driver figures it out in this case */
1782 info
->color_formats
= 0;
1784 if (edid
->revision
< 3)
1787 if (!(edid
->input
& DRM_EDID_INPUT_DIGITAL
))
1790 /* Get data from CEA blocks if present */
1791 edid_ext
= drm_find_cea_extension(edid
);
1793 info
->cea_rev
= edid_ext
[1];
1795 /* The existence of a CEA block should imply RGB support */
1796 info
->color_formats
= DRM_COLOR_FORMAT_RGB444
;
1797 if (edid_ext
[3] & EDID_CEA_YCRCB444
)
1798 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB444
;
1799 if (edid_ext
[3] & EDID_CEA_YCRCB422
)
1800 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB422
;
1803 /* Only defined for 1.4 with digital displays */
1804 if (edid
->revision
< 4)
1807 switch (edid
->input
& DRM_EDID_DIGITAL_DEPTH_MASK
) {
1808 case DRM_EDID_DIGITAL_DEPTH_6
:
1811 case DRM_EDID_DIGITAL_DEPTH_8
:
1814 case DRM_EDID_DIGITAL_DEPTH_10
:
1817 case DRM_EDID_DIGITAL_DEPTH_12
:
1820 case DRM_EDID_DIGITAL_DEPTH_14
:
1823 case DRM_EDID_DIGITAL_DEPTH_16
:
1826 case DRM_EDID_DIGITAL_DEPTH_UNDEF
:
1832 info
->color_formats
|= DRM_COLOR_FORMAT_RGB444
;
1833 if (edid
->features
& DRM_EDID_FEATURE_RGB_YCRCB444
)
1834 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB444
;
1835 if (edid
->features
& DRM_EDID_FEATURE_RGB_YCRCB422
)
1836 info
->color_formats
|= DRM_COLOR_FORMAT_YCRCB422
;
1840 * drm_add_edid_modes - add modes from EDID data, if available
1841 * @connector: connector we're probing
1844 * Add the specified modes to the connector's mode list.
1846 * Return number of modes added or 0 if we couldn't find any.
1848 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
1856 if (!drm_edid_is_valid(edid
)) {
1857 dev_warn(connector
->dev
->dev
, "%s: EDID invalid.\n",
1858 drm_get_connector_name(connector
));
1862 quirks
= edid_get_quirks(edid
);
1865 * EDID spec says modes should be preferred in this order:
1866 * - preferred detailed mode
1867 * - other detailed modes from base block
1868 * - detailed modes from extension blocks
1869 * - CVT 3-byte code modes
1870 * - standard timing codes
1871 * - established timing codes
1872 * - modes inferred from GTF or CVT range information
1874 * We get this pretty much right.
1876 * XXX order for additional mode types in extension blocks?
1878 num_modes
+= add_detailed_modes(connector
, edid
, quirks
);
1879 num_modes
+= add_cvt_modes(connector
, edid
);
1880 num_modes
+= add_standard_modes(connector
, edid
);
1881 num_modes
+= add_established_modes(connector
, edid
);
1882 num_modes
+= add_inferred_modes(connector
, edid
);
1883 num_modes
+= add_cea_modes(connector
, edid
);
1885 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
1886 edid_fixup_preferred(connector
, quirks
);
1888 drm_add_display_info(edid
, &connector
->display_info
);
1892 EXPORT_SYMBOL(drm_add_edid_modes
);
1895 * drm_add_modes_noedid - add modes for the connectors without EDID
1896 * @connector: connector we're probing
1897 * @hdisplay: the horizontal display limit
1898 * @vdisplay: the vertical display limit
1900 * Add the specified modes to the connector's mode list. Only when the
1901 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1903 * Return number of modes added or 0 if we couldn't find any.
1905 int drm_add_modes_noedid(struct drm_connector
*connector
,
1906 int hdisplay
, int vdisplay
)
1908 int i
, count
, num_modes
= 0;
1909 struct drm_display_mode
*mode
;
1910 struct drm_device
*dev
= connector
->dev
;
1912 count
= sizeof(drm_dmt_modes
) / sizeof(struct drm_display_mode
);
1918 for (i
= 0; i
< count
; i
++) {
1919 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
1920 if (hdisplay
&& vdisplay
) {
1922 * Only when two are valid, they will be used to check
1923 * whether the mode should be added to the mode list of
1926 if (ptr
->hdisplay
> hdisplay
||
1927 ptr
->vdisplay
> vdisplay
)
1930 if (drm_mode_vrefresh(ptr
) > 61)
1932 mode
= drm_mode_duplicate(dev
, ptr
);
1934 drm_mode_probed_add(connector
, mode
);
1940 EXPORT_SYMBOL(drm_add_modes_noedid
);