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.
153 drm_edid_block_valid(u8
*raw_edid
)
157 struct edid
*edid
= (struct edid
*)raw_edid
;
159 if (raw_edid
[0] == 0x00) {
160 int score
= drm_edid_header_is_valid(raw_edid
);
162 else if (score
>= 6) {
163 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
164 memcpy(raw_edid
, edid_header
, sizeof(edid_header
));
170 for (i
= 0; i
< EDID_LENGTH
; i
++)
173 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum
);
175 /* allow CEA to slide through, switches mangle this */
176 if (raw_edid
[0] != 0x02)
180 /* per-block-type checks */
181 switch (raw_edid
[0]) {
183 if (edid
->version
!= 1) {
184 DRM_ERROR("EDID has major version %d, instead of 1\n", edid
->version
);
188 if (edid
->revision
> 4)
189 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
200 printk(KERN_ERR
"Raw EDID:\n");
201 print_hex_dump(KERN_ERR
, " \t", DUMP_PREFIX_NONE
, 16, 1,
202 raw_edid
, EDID_LENGTH
, false);
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
))
227 EXPORT_SYMBOL(drm_edid_is_valid
);
229 #define DDC_ADDR 0x50
230 #define DDC_SEGMENT_ADDR 0x30
232 * Get EDID information via I2C.
234 * \param adapter : i2c device adaptor
235 * \param buf : EDID data buffer to be filled
236 * \param len : EDID data buffer length
237 * \return 0 on success or -1 on failure.
239 * Try to fetch EDID information by calling i2c driver function.
242 drm_do_probe_ddc_edid(struct i2c_adapter
*adapter
, unsigned char *buf
,
245 unsigned char start
= block
* EDID_LENGTH
;
246 int ret
, retries
= 5;
248 /* The core i2c driver will automatically retry the transfer if the
249 * adapter reports EAGAIN. However, we find that bit-banging transfers
250 * are susceptible to errors under a heavily loaded machine and
251 * generate spurious NAKs and timeouts. Retrying the transfer
252 * of the individual block a few times seems to overcome this.
255 struct i2c_msg msgs
[] = {
268 ret
= i2c_transfer(adapter
, msgs
, 2);
270 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
274 } while (ret
!= 2 && --retries
);
276 return ret
== 2 ? 0 : -1;
279 static bool drm_edid_is_zero(u8
*in_edid
, int length
)
282 u32
*raw_edid
= (u32
*)in_edid
;
284 for (i
= 0; i
< length
/ 4; i
++)
285 if (*(raw_edid
+ i
) != 0)
291 drm_do_get_edid(struct drm_connector
*connector
, struct i2c_adapter
*adapter
)
293 int i
, j
= 0, valid_extensions
= 0;
296 if ((block
= kmalloc(EDID_LENGTH
, GFP_KERNEL
)) == NULL
)
299 /* base block fetch */
300 for (i
= 0; i
< 4; i
++) {
301 if (drm_do_probe_ddc_edid(adapter
, block
, 0, EDID_LENGTH
))
303 if (drm_edid_block_valid(block
))
305 if (i
== 0 && drm_edid_is_zero(block
, EDID_LENGTH
)) {
306 connector
->null_edid_counter
++;
313 /* if there's no extensions, we're done */
314 if (block
[0x7e] == 0)
317 new = krealloc(block
, (block
[0x7e] + 1) * EDID_LENGTH
, GFP_KERNEL
);
322 for (j
= 1; j
<= block
[0x7e]; j
++) {
323 for (i
= 0; i
< 4; i
++) {
324 if (drm_do_probe_ddc_edid(adapter
,
325 block
+ (valid_extensions
+ 1) * EDID_LENGTH
,
328 if (drm_edid_block_valid(block
+ (valid_extensions
+ 1) * EDID_LENGTH
)) {
334 dev_warn(connector
->dev
->dev
,
335 "%s: Ignoring invalid EDID block %d.\n",
336 drm_get_connector_name(connector
), j
);
339 if (valid_extensions
!= block
[0x7e]) {
340 block
[EDID_LENGTH
-1] += block
[0x7e] - valid_extensions
;
341 block
[0x7e] = valid_extensions
;
342 new = krealloc(block
, (valid_extensions
+ 1) * EDID_LENGTH
, GFP_KERNEL
);
351 dev_warn(connector
->dev
->dev
, "%s: EDID block %d invalid.\n",
352 drm_get_connector_name(connector
), j
);
360 * Probe DDC presence.
362 * \param adapter : i2c device adaptor
363 * \return 1 on success
366 drm_probe_ddc(struct i2c_adapter
*adapter
)
370 return (drm_do_probe_ddc_edid(adapter
, &out
, 0, 1) == 0);
374 * drm_get_edid - get EDID data, if available
375 * @connector: connector we're probing
376 * @adapter: i2c adapter to use for DDC
378 * Poke the given i2c channel to grab EDID data if possible. If found,
379 * attach it to the connector.
381 * Return edid data or NULL if we couldn't find any.
383 struct edid
*drm_get_edid(struct drm_connector
*connector
,
384 struct i2c_adapter
*adapter
)
386 struct edid
*edid
= NULL
;
388 if (drm_probe_ddc(adapter
))
389 edid
= (struct edid
*)drm_do_get_edid(connector
, adapter
);
391 connector
->display_info
.raw_edid
= (char *)edid
;
396 EXPORT_SYMBOL(drm_get_edid
);
398 /*** EDID parsing ***/
401 * edid_vendor - match a string against EDID's obfuscated vendor field
402 * @edid: EDID to match
403 * @vendor: vendor string
405 * Returns true if @vendor is in @edid, false otherwise
407 static bool edid_vendor(struct edid
*edid
, char *vendor
)
411 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
412 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
413 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
414 edid_vendor
[2] = (edid
->mfg_id
[1] & 0x1f) + '@';
416 return !strncmp(edid_vendor
, vendor
, 3);
420 * edid_get_quirks - return quirk flags for a given EDID
421 * @edid: EDID to process
423 * This tells subsequent routines what fixes they need to apply.
425 static u32
edid_get_quirks(struct edid
*edid
)
427 struct edid_quirk
*quirk
;
430 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
431 quirk
= &edid_quirk_list
[i
];
433 if (edid_vendor(edid
, quirk
->vendor
) &&
434 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
435 return quirk
->quirks
;
441 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
442 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
445 * edid_fixup_preferred - set preferred modes based on quirk list
446 * @connector: has mode list to fix up
447 * @quirks: quirks list
449 * Walk the mode list for @connector, clearing the preferred status
450 * on existing modes and setting it anew for the right mode ala @quirks.
452 static void edid_fixup_preferred(struct drm_connector
*connector
,
455 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
456 int target_refresh
= 0;
458 if (list_empty(&connector
->probed_modes
))
461 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
463 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
466 preferred_mode
= list_first_entry(&connector
->probed_modes
,
467 struct drm_display_mode
, head
);
469 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
470 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
472 if (cur_mode
== preferred_mode
)
475 /* Largest mode is preferred */
476 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
477 preferred_mode
= cur_mode
;
479 /* At a given size, try to get closest to target refresh */
480 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
481 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
482 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
483 preferred_mode
= cur_mode
;
487 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
490 struct drm_display_mode
*drm_mode_find_dmt(struct drm_device
*dev
,
491 int hsize
, int vsize
, int fresh
)
493 struct drm_display_mode
*mode
= NULL
;
496 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
497 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
498 if (hsize
== ptr
->hdisplay
&&
499 vsize
== ptr
->vdisplay
&&
500 fresh
== drm_mode_vrefresh(ptr
)) {
501 /* get the expected default mode */
502 mode
= drm_mode_duplicate(dev
, ptr
);
508 EXPORT_SYMBOL(drm_mode_find_dmt
);
510 typedef void detailed_cb(struct detailed_timing
*timing
, void *closure
);
513 cea_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
517 u8
*det_base
= ext
+ d
;
520 for (i
= 0; i
< n
; i
++)
521 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
525 vtb_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
527 unsigned int i
, n
= min((int)ext
[0x02], 6);
528 u8
*det_base
= ext
+ 5;
531 return; /* unknown version */
533 for (i
= 0; i
< n
; i
++)
534 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
538 drm_for_each_detailed_block(u8
*raw_edid
, detailed_cb
*cb
, void *closure
)
541 struct edid
*edid
= (struct edid
*)raw_edid
;
546 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++)
547 cb(&(edid
->detailed_timings
[i
]), closure
);
549 for (i
= 1; i
<= raw_edid
[0x7e]; i
++) {
550 u8
*ext
= raw_edid
+ (i
* EDID_LENGTH
);
553 cea_for_each_detailed_block(ext
, cb
, closure
);
556 vtb_for_each_detailed_block(ext
, cb
, closure
);
565 is_rb(struct detailed_timing
*t
, void *data
)
568 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
)
570 *(bool *)data
= true;
573 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
575 drm_monitor_supports_rb(struct edid
*edid
)
577 if (edid
->revision
>= 4) {
579 drm_for_each_detailed_block((u8
*)edid
, is_rb
, &ret
);
583 return ((edid
->input
& DRM_EDID_INPUT_DIGITAL
) != 0);
587 find_gtf2(struct detailed_timing
*t
, void *data
)
590 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
&& r
[10] == 0x02)
594 /* Secondary GTF curve kicks in above some break frequency */
596 drm_gtf2_hbreak(struct edid
*edid
)
599 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
600 return r
? (r
[12] * 2) : 0;
604 drm_gtf2_2c(struct edid
*edid
)
607 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
608 return r
? r
[13] : 0;
612 drm_gtf2_m(struct edid
*edid
)
615 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
616 return r
? (r
[15] << 8) + r
[14] : 0;
620 drm_gtf2_k(struct edid
*edid
)
623 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
624 return r
? r
[16] : 0;
628 drm_gtf2_2j(struct edid
*edid
)
631 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
632 return r
? r
[17] : 0;
636 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
637 * @edid: EDID block to scan
639 static int standard_timing_level(struct edid
*edid
)
641 if (edid
->revision
>= 2) {
642 if (edid
->revision
>= 4 && (edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
))
644 if (drm_gtf2_hbreak(edid
))
652 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
653 * monitors fill with ascii space (0x20) instead.
656 bad_std_timing(u8 a
, u8 b
)
658 return (a
== 0x00 && b
== 0x00) ||
659 (a
== 0x01 && b
== 0x01) ||
660 (a
== 0x20 && b
== 0x20);
664 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
665 * @t: standard timing params
666 * @timing_level: standard timing level
668 * Take the standard timing params (in this case width, aspect, and refresh)
669 * and convert them into a real mode using CVT/GTF/DMT.
671 static struct drm_display_mode
*
672 drm_mode_std(struct drm_connector
*connector
, struct edid
*edid
,
673 struct std_timing
*t
, int revision
)
675 struct drm_device
*dev
= connector
->dev
;
676 struct drm_display_mode
*m
, *mode
= NULL
;
679 unsigned aspect_ratio
= (t
->vfreq_aspect
& EDID_TIMING_ASPECT_MASK
)
680 >> EDID_TIMING_ASPECT_SHIFT
;
681 unsigned vfreq
= (t
->vfreq_aspect
& EDID_TIMING_VFREQ_MASK
)
682 >> EDID_TIMING_VFREQ_SHIFT
;
683 int timing_level
= standard_timing_level(edid
);
685 if (bad_std_timing(t
->hsize
, t
->vfreq_aspect
))
688 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
689 hsize
= t
->hsize
* 8 + 248;
690 /* vrefresh_rate = vfreq + 60 */
691 vrefresh_rate
= vfreq
+ 60;
692 /* the vdisplay is calculated based on the aspect ratio */
693 if (aspect_ratio
== 0) {
697 vsize
= (hsize
* 10) / 16;
698 } else if (aspect_ratio
== 1)
699 vsize
= (hsize
* 3) / 4;
700 else if (aspect_ratio
== 2)
701 vsize
= (hsize
* 4) / 5;
703 vsize
= (hsize
* 9) / 16;
705 /* HDTV hack, part 1 */
706 if (vrefresh_rate
== 60 &&
707 ((hsize
== 1360 && vsize
== 765) ||
708 (hsize
== 1368 && vsize
== 769))) {
714 * If this connector already has a mode for this size and refresh
715 * rate (because it came from detailed or CVT info), use that
716 * instead. This way we don't have to guess at interlace or
719 list_for_each_entry(m
, &connector
->probed_modes
, head
)
720 if (m
->hdisplay
== hsize
&& m
->vdisplay
== vsize
&&
721 drm_mode_vrefresh(m
) == vrefresh_rate
)
724 /* HDTV hack, part 2 */
725 if (hsize
== 1366 && vsize
== 768 && vrefresh_rate
== 60) {
726 mode
= drm_cvt_mode(dev
, 1366, 768, vrefresh_rate
, 0, 0,
728 mode
->hdisplay
= 1366;
729 mode
->hsync_start
= mode
->hsync_start
- 1;
730 mode
->hsync_end
= mode
->hsync_end
- 1;
734 /* check whether it can be found in default mode table */
735 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
);
739 switch (timing_level
) {
743 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
747 * This is potentially wrong if there's ever a monitor with
748 * more than one ranges section, each claiming a different
749 * secondary GTF curve. Please don't do that.
751 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
752 if (drm_mode_hsync(mode
) > drm_gtf2_hbreak(edid
)) {
754 mode
= drm_gtf_mode_complex(dev
, hsize
, vsize
,
763 mode
= drm_cvt_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0,
771 * EDID is delightfully ambiguous about how interlaced modes are to be
772 * encoded. Our internal representation is of frame height, but some
773 * HDTV detailed timings are encoded as field height.
775 * The format list here is from CEA, in frame size. Technically we
776 * should be checking refresh rate too. Whatever.
779 drm_mode_do_interlace_quirk(struct drm_display_mode
*mode
,
780 struct detailed_pixel_timing
*pt
)
783 static const struct {
785 } cea_interlaced
[] = {
795 if (!(pt
->misc
& DRM_EDID_PT_INTERLACED
))
798 for (i
= 0; i
< ARRAY_SIZE(cea_interlaced
); i
++) {
799 if ((mode
->hdisplay
== cea_interlaced
[i
].w
) &&
800 (mode
->vdisplay
== cea_interlaced
[i
].h
/ 2)) {
802 mode
->vsync_start
*= 2;
803 mode
->vsync_end
*= 2;
809 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
813 * drm_mode_detailed - create a new mode from an EDID detailed timing section
814 * @dev: DRM device (needed to create new mode)
816 * @timing: EDID detailed timing info
817 * @quirks: quirks to apply
819 * An EDID detailed timing block contains enough info for us to create and
820 * return a new struct drm_display_mode.
822 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
824 struct detailed_timing
*timing
,
827 struct drm_display_mode
*mode
;
828 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
829 unsigned hactive
= (pt
->hactive_hblank_hi
& 0xf0) << 4 | pt
->hactive_lo
;
830 unsigned vactive
= (pt
->vactive_vblank_hi
& 0xf0) << 4 | pt
->vactive_lo
;
831 unsigned hblank
= (pt
->hactive_hblank_hi
& 0xf) << 8 | pt
->hblank_lo
;
832 unsigned vblank
= (pt
->vactive_vblank_hi
& 0xf) << 8 | pt
->vblank_lo
;
833 unsigned hsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc0) << 2 | pt
->hsync_offset_lo
;
834 unsigned hsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x30) << 4 | pt
->hsync_pulse_width_lo
;
835 unsigned vsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc) >> 2 | pt
->vsync_offset_pulse_width_lo
>> 4;
836 unsigned vsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x3) << 4 | (pt
->vsync_offset_pulse_width_lo
& 0xf);
838 /* ignore tiny modes */
839 if (hactive
< 64 || vactive
< 64)
842 if (pt
->misc
& DRM_EDID_PT_STEREO
) {
843 printk(KERN_WARNING
"stereo mode not supported\n");
846 if (!(pt
->misc
& DRM_EDID_PT_SEPARATE_SYNC
)) {
847 printk(KERN_WARNING
"composite sync not supported\n");
850 /* it is incorrect if hsync/vsync width is zero */
851 if (!hsync_pulse_width
|| !vsync_pulse_width
) {
852 DRM_DEBUG_KMS("Incorrect Detailed timing. "
853 "Wrong Hsync/Vsync pulse width\n");
856 mode
= drm_mode_create(dev
);
860 mode
->type
= DRM_MODE_TYPE_DRIVER
;
862 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
863 timing
->pixel_clock
= cpu_to_le16(1088);
865 mode
->clock
= le16_to_cpu(timing
->pixel_clock
) * 10;
867 mode
->hdisplay
= hactive
;
868 mode
->hsync_start
= mode
->hdisplay
+ hsync_offset
;
869 mode
->hsync_end
= mode
->hsync_start
+ hsync_pulse_width
;
870 mode
->htotal
= mode
->hdisplay
+ hblank
;
872 mode
->vdisplay
= vactive
;
873 mode
->vsync_start
= mode
->vdisplay
+ vsync_offset
;
874 mode
->vsync_end
= mode
->vsync_start
+ vsync_pulse_width
;
875 mode
->vtotal
= mode
->vdisplay
+ vblank
;
877 /* Some EDIDs have bogus h/vtotal values */
878 if (mode
->hsync_end
> mode
->htotal
)
879 mode
->htotal
= mode
->hsync_end
+ 1;
880 if (mode
->vsync_end
> mode
->vtotal
)
881 mode
->vtotal
= mode
->vsync_end
+ 1;
883 drm_mode_do_interlace_quirk(mode
, pt
);
885 drm_mode_set_name(mode
);
887 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
888 pt
->misc
|= DRM_EDID_PT_HSYNC_POSITIVE
| DRM_EDID_PT_VSYNC_POSITIVE
;
891 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_HSYNC_POSITIVE
) ?
892 DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
893 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_VSYNC_POSITIVE
) ?
894 DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
896 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_height_mm_hi
& 0xf0) << 4;
897 mode
->height_mm
= pt
->height_mm_lo
| (pt
->width_height_mm_hi
& 0xf) << 8;
899 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
900 mode
->width_mm
*= 10;
901 mode
->height_mm
*= 10;
904 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
905 mode
->width_mm
= edid
->width_cm
* 10;
906 mode
->height_mm
= edid
->height_cm
* 10;
913 mode_is_rb(const struct drm_display_mode
*mode
)
915 return (mode
->htotal
- mode
->hdisplay
== 160) &&
916 (mode
->hsync_end
- mode
->hdisplay
== 80) &&
917 (mode
->hsync_end
- mode
->hsync_start
== 32) &&
918 (mode
->vsync_start
- mode
->vdisplay
== 3);
922 mode_in_hsync_range(const struct drm_display_mode
*mode
,
923 struct edid
*edid
, u8
*t
)
925 int hsync
, hmin
, hmax
;
928 if (edid
->revision
>= 4)
929 hmin
+= ((t
[4] & 0x04) ? 255 : 0);
931 if (edid
->revision
>= 4)
932 hmax
+= ((t
[4] & 0x08) ? 255 : 0);
933 hsync
= drm_mode_hsync(mode
);
935 return (hsync
<= hmax
&& hsync
>= hmin
);
939 mode_in_vsync_range(const struct drm_display_mode
*mode
,
940 struct edid
*edid
, u8
*t
)
942 int vsync
, vmin
, vmax
;
945 if (edid
->revision
>= 4)
946 vmin
+= ((t
[4] & 0x01) ? 255 : 0);
948 if (edid
->revision
>= 4)
949 vmax
+= ((t
[4] & 0x02) ? 255 : 0);
950 vsync
= drm_mode_vrefresh(mode
);
952 return (vsync
<= vmax
&& vsync
>= vmin
);
956 range_pixel_clock(struct edid
*edid
, u8
*t
)
959 if (t
[9] == 0 || t
[9] == 255)
962 /* 1.4 with CVT support gives us real precision, yay */
963 if (edid
->revision
>= 4 && t
[10] == 0x04)
964 return (t
[9] * 10000) - ((t
[12] >> 2) * 250);
966 /* 1.3 is pathetic, so fuzz up a bit */
967 return t
[9] * 10000 + 5001;
971 mode_in_range(const struct drm_display_mode
*mode
, struct edid
*edid
,
972 struct detailed_timing
*timing
)
975 u8
*t
= (u8
*)timing
;
977 if (!mode_in_hsync_range(mode
, edid
, t
))
980 if (!mode_in_vsync_range(mode
, edid
, t
))
983 if ((max_clock
= range_pixel_clock(edid
, t
)))
984 if (mode
->clock
> max_clock
)
987 /* 1.4 max horizontal check */
988 if (edid
->revision
>= 4 && t
[10] == 0x04)
989 if (t
[13] && mode
->hdisplay
> 8 * (t
[13] + (256 * (t
[12]&0x3))))
992 if (mode_is_rb(mode
) && !drm_monitor_supports_rb(edid
))
999 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
1000 * need to account for them.
1003 drm_gtf_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1004 struct detailed_timing
*timing
)
1007 struct drm_display_mode
*newmode
;
1008 struct drm_device
*dev
= connector
->dev
;
1010 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
1011 if (mode_in_range(drm_dmt_modes
+ i
, edid
, timing
)) {
1012 newmode
= drm_mode_duplicate(dev
, &drm_dmt_modes
[i
]);
1014 drm_mode_probed_add(connector
, newmode
);
1024 do_inferred_modes(struct detailed_timing
*timing
, void *c
)
1026 struct detailed_mode_closure
*closure
= c
;
1027 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1028 int gtf
= (closure
->edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
);
1030 if (gtf
&& data
->type
== EDID_DETAIL_MONITOR_RANGE
)
1031 closure
->modes
+= drm_gtf_modes_for_range(closure
->connector
,
1037 add_inferred_modes(struct drm_connector
*connector
, struct edid
*edid
)
1039 struct detailed_mode_closure closure
= {
1040 connector
, edid
, 0, 0, 0
1043 if (version_greater(edid
, 1, 0))
1044 drm_for_each_detailed_block((u8
*)edid
, do_inferred_modes
,
1047 return closure
.modes
;
1051 drm_est3_modes(struct drm_connector
*connector
, struct detailed_timing
*timing
)
1053 int i
, j
, m
, modes
= 0;
1054 struct drm_display_mode
*mode
;
1055 u8
*est
= ((u8
*)timing
) + 5;
1057 for (i
= 0; i
< 6; i
++) {
1058 for (j
= 7; j
> 0; j
--) {
1059 m
= (i
* 8) + (7 - j
);
1060 if (m
>= ARRAY_SIZE(est3_modes
))
1062 if (est
[i
] & (1 << j
)) {
1063 mode
= drm_mode_find_dmt(connector
->dev
,
1067 /*, est3_modes[m].rb */);
1069 drm_mode_probed_add(connector
, mode
);
1080 do_established_modes(struct detailed_timing
*timing
, void *c
)
1082 struct detailed_mode_closure
*closure
= c
;
1083 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1085 if (data
->type
== EDID_DETAIL_EST_TIMINGS
)
1086 closure
->modes
+= drm_est3_modes(closure
->connector
, timing
);
1090 * add_established_modes - get est. modes from EDID and add them
1091 * @edid: EDID block to scan
1093 * Each EDID block contains a bitmap of the supported "established modes" list
1094 * (defined above). Tease them out and add them to the global modes list.
1097 add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
1099 struct drm_device
*dev
= connector
->dev
;
1100 unsigned long est_bits
= edid
->established_timings
.t1
|
1101 (edid
->established_timings
.t2
<< 8) |
1102 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
1104 struct detailed_mode_closure closure
= {
1105 connector
, edid
, 0, 0, 0
1108 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++) {
1109 if (est_bits
& (1<<i
)) {
1110 struct drm_display_mode
*newmode
;
1111 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
1113 drm_mode_probed_add(connector
, newmode
);
1119 if (version_greater(edid
, 1, 0))
1120 drm_for_each_detailed_block((u8
*)edid
,
1121 do_established_modes
, &closure
);
1123 return modes
+ closure
.modes
;
1127 do_standard_modes(struct detailed_timing
*timing
, void *c
)
1129 struct detailed_mode_closure
*closure
= c
;
1130 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1131 struct drm_connector
*connector
= closure
->connector
;
1132 struct edid
*edid
= closure
->edid
;
1134 if (data
->type
== EDID_DETAIL_STD_MODES
) {
1136 for (i
= 0; i
< 6; i
++) {
1137 struct std_timing
*std
;
1138 struct drm_display_mode
*newmode
;
1140 std
= &data
->data
.timings
[i
];
1141 newmode
= drm_mode_std(connector
, edid
, std
,
1144 drm_mode_probed_add(connector
, newmode
);
1152 * add_standard_modes - get std. modes from EDID and add them
1153 * @edid: EDID block to scan
1155 * Standard modes can be calculated using the appropriate standard (DMT,
1156 * GTF or CVT. Grab them from @edid and add them to the list.
1159 add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
1162 struct detailed_mode_closure closure
= {
1163 connector
, edid
, 0, 0, 0
1166 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
1167 struct drm_display_mode
*newmode
;
1169 newmode
= drm_mode_std(connector
, edid
,
1170 &edid
->standard_timings
[i
],
1173 drm_mode_probed_add(connector
, newmode
);
1178 if (version_greater(edid
, 1, 0))
1179 drm_for_each_detailed_block((u8
*)edid
, do_standard_modes
,
1182 /* XXX should also look for standard codes in VTB blocks */
1184 return modes
+ closure
.modes
;
1187 static int drm_cvt_modes(struct drm_connector
*connector
,
1188 struct detailed_timing
*timing
)
1190 int i
, j
, modes
= 0;
1191 struct drm_display_mode
*newmode
;
1192 struct drm_device
*dev
= connector
->dev
;
1193 struct cvt_timing
*cvt
;
1194 const int rates
[] = { 60, 85, 75, 60, 50 };
1195 const u8 empty
[3] = { 0, 0, 0 };
1197 for (i
= 0; i
< 4; i
++) {
1198 int uninitialized_var(width
), height
;
1199 cvt
= &(timing
->data
.other_data
.data
.cvt
[i
]);
1201 if (!memcmp(cvt
->code
, empty
, 3))
1204 height
= (cvt
->code
[0] + ((cvt
->code
[1] & 0xf0) << 4) + 1) * 2;
1205 switch (cvt
->code
[1] & 0x0c) {
1207 width
= height
* 4 / 3;
1210 width
= height
* 16 / 9;
1213 width
= height
* 16 / 10;
1216 width
= height
* 15 / 9;
1220 for (j
= 1; j
< 5; j
++) {
1221 if (cvt
->code
[2] & (1 << j
)) {
1222 newmode
= drm_cvt_mode(dev
, width
, height
,
1226 drm_mode_probed_add(connector
, newmode
);
1237 do_cvt_mode(struct detailed_timing
*timing
, void *c
)
1239 struct detailed_mode_closure
*closure
= c
;
1240 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1242 if (data
->type
== EDID_DETAIL_CVT_3BYTE
)
1243 closure
->modes
+= drm_cvt_modes(closure
->connector
, timing
);
1247 add_cvt_modes(struct drm_connector
*connector
, struct edid
*edid
)
1249 struct detailed_mode_closure closure
= {
1250 connector
, edid
, 0, 0, 0
1253 if (version_greater(edid
, 1, 2))
1254 drm_for_each_detailed_block((u8
*)edid
, do_cvt_mode
, &closure
);
1256 /* XXX should also look for CVT codes in VTB blocks */
1258 return closure
.modes
;
1262 do_detailed_mode(struct detailed_timing
*timing
, void *c
)
1264 struct detailed_mode_closure
*closure
= c
;
1265 struct drm_display_mode
*newmode
;
1267 if (timing
->pixel_clock
) {
1268 newmode
= drm_mode_detailed(closure
->connector
->dev
,
1269 closure
->edid
, timing
,
1274 if (closure
->preferred
)
1275 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
1277 drm_mode_probed_add(closure
->connector
, newmode
);
1279 closure
->preferred
= 0;
1284 * add_detailed_modes - Add modes from detailed timings
1285 * @connector: attached connector
1286 * @edid: EDID block to scan
1287 * @quirks: quirks to apply
1290 add_detailed_modes(struct drm_connector
*connector
, struct edid
*edid
,
1293 struct detailed_mode_closure closure
= {
1301 if (closure
.preferred
&& !version_greater(edid
, 1, 3))
1303 (edid
->features
& DRM_EDID_FEATURE_PREFERRED_TIMING
);
1305 drm_for_each_detailed_block((u8
*)edid
, do_detailed_mode
, &closure
);
1307 return closure
.modes
;
1310 #define HDMI_IDENTIFIER 0x000C03
1311 #define AUDIO_BLOCK 0x01
1312 #define VIDEO_BLOCK 0x02
1313 #define VENDOR_BLOCK 0x03
1314 #define SPEAKER_BLOCK 0x04
1315 #define EDID_BASIC_AUDIO (1 << 6)
1318 * Search EDID for CEA extension block.
1320 u8
*drm_find_cea_extension(struct edid
*edid
)
1322 u8
*edid_ext
= NULL
;
1325 /* No EDID or EDID extensions */
1326 if (edid
== NULL
|| edid
->extensions
== 0)
1329 /* Find CEA extension */
1330 for (i
= 0; i
< edid
->extensions
; i
++) {
1331 edid_ext
= (u8
*)edid
+ EDID_LENGTH
* (i
+ 1);
1332 if (edid_ext
[0] == CEA_EXT
)
1336 if (i
== edid
->extensions
)
1341 EXPORT_SYMBOL(drm_find_cea_extension
);
1344 do_cea_modes (struct drm_connector
*connector
, u8
*db
, u8 len
)
1346 struct drm_device
*dev
= connector
->dev
;
1347 u8
* mode
, cea_mode
;
1350 for (mode
= db
; mode
< db
+ len
; mode
++) {
1351 cea_mode
= (*mode
& 127) - 1; /* CEA modes are numbered 1..127 */
1352 if (cea_mode
< drm_num_cea_modes
) {
1353 struct drm_display_mode
*newmode
;
1354 newmode
= drm_mode_duplicate(dev
,
1355 &edid_cea_modes
[cea_mode
]);
1357 drm_mode_probed_add(connector
, newmode
);
1367 add_cea_modes(struct drm_connector
*connector
, struct edid
*edid
)
1369 u8
* cea
= drm_find_cea_extension(edid
);
1373 if (cea
&& cea
[1] >= 3) {
1374 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1376 if (((db
[0] & 0xe0) >> 5) == VIDEO_BLOCK
)
1377 modes
+= do_cea_modes (connector
, db
+1, dbl
);
1385 parse_hdmi_vsdb(struct drm_connector
*connector
, uint8_t *db
)
1387 connector
->eld
[5] |= (db
[6] >> 7) << 1; /* Supports_AI */
1389 connector
->dvi_dual
= db
[6] & 1;
1390 connector
->max_tmds_clock
= db
[7] * 5;
1392 connector
->latency_present
[0] = db
[8] >> 7;
1393 connector
->latency_present
[1] = (db
[8] >> 6) & 1;
1394 connector
->video_latency
[0] = db
[9];
1395 connector
->audio_latency
[0] = db
[10];
1396 connector
->video_latency
[1] = db
[11];
1397 connector
->audio_latency
[1] = db
[12];
1399 DRM_LOG_KMS("HDMI: DVI dual %d, "
1400 "max TMDS clock %d, "
1401 "latency present %d %d, "
1402 "video latency %d %d, "
1403 "audio latency %d %d\n",
1404 connector
->dvi_dual
,
1405 connector
->max_tmds_clock
,
1406 (int) connector
->latency_present
[0],
1407 (int) connector
->latency_present
[1],
1408 connector
->video_latency
[0],
1409 connector
->video_latency
[1],
1410 connector
->audio_latency
[0],
1411 connector
->audio_latency
[1]);
1415 monitor_name(struct detailed_timing
*t
, void *data
)
1417 if (t
->data
.other_data
.type
== EDID_DETAIL_MONITOR_NAME
)
1418 *(u8
**)data
= t
->data
.other_data
.data
.str
.str
;
1422 * drm_edid_to_eld - build ELD from EDID
1423 * @connector: connector corresponding to the HDMI/DP sink
1424 * @edid: EDID to parse
1426 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1427 * Some ELD fields are left to the graphics driver caller:
1432 void drm_edid_to_eld(struct drm_connector
*connector
, struct edid
*edid
)
1434 uint8_t *eld
= connector
->eld
;
1442 memset(eld
, 0, sizeof(connector
->eld
));
1444 cea
= drm_find_cea_extension(edid
);
1446 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1451 drm_for_each_detailed_block((u8
*)edid
, monitor_name
, &name
);
1452 for (mnl
= 0; name
&& mnl
< 13; mnl
++) {
1453 if (name
[mnl
] == 0x0a)
1455 eld
[20 + mnl
] = name
[mnl
];
1457 eld
[4] = (cea
[1] << 5) | mnl
;
1458 DRM_DEBUG_KMS("ELD monitor %s\n", eld
+ 20);
1460 eld
[0] = 2 << 3; /* ELD version: 2 */
1462 eld
[16] = edid
->mfg_id
[0];
1463 eld
[17] = edid
->mfg_id
[1];
1464 eld
[18] = edid
->prod_code
[0];
1465 eld
[19] = edid
->prod_code
[1];
1468 for (db
= cea
+ 4; db
< cea
+ cea
[2]; db
+= dbl
+ 1) {
1471 switch ((db
[0] & 0xe0) >> 5) {
1473 /* Audio Data Block, contains SADs */
1474 sad_count
= dbl
/ 3;
1475 memcpy(eld
+ 20 + mnl
, &db
[1], dbl
);
1478 /* Speaker Allocation Data Block */
1482 /* HDMI Vendor-Specific Data Block */
1483 if (db
[1] == 0x03 && db
[2] == 0x0c && db
[3] == 0)
1484 parse_hdmi_vsdb(connector
, db
);
1490 eld
[5] |= sad_count
<< 4;
1491 eld
[2] = (20 + mnl
+ sad_count
* 3 + 3) / 4;
1493 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld
[2], sad_count
);
1495 EXPORT_SYMBOL(drm_edid_to_eld
);
1498 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1499 * @connector: connector associated with the HDMI/DP sink
1500 * @mode: the display mode
1502 int drm_av_sync_delay(struct drm_connector
*connector
,
1503 struct drm_display_mode
*mode
)
1505 int i
= !!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
);
1508 if (!connector
->latency_present
[0])
1510 if (!connector
->latency_present
[1])
1513 a
= connector
->audio_latency
[i
];
1514 v
= connector
->video_latency
[i
];
1517 * HDMI/DP sink doesn't support audio or video?
1519 if (a
== 255 || v
== 255)
1523 * Convert raw EDID values to millisecond.
1524 * Treat unknown latency as 0ms.
1527 a
= min(2 * (a
- 1), 500);
1529 v
= min(2 * (v
- 1), 500);
1531 return max(v
- a
, 0);
1533 EXPORT_SYMBOL(drm_av_sync_delay
);
1536 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1537 * @encoder: the encoder just changed display mode
1538 * @mode: the adjusted display mode
1540 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1541 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1543 struct drm_connector
*drm_select_eld(struct drm_encoder
*encoder
,
1544 struct drm_display_mode
*mode
)
1546 struct drm_connector
*connector
;
1547 struct drm_device
*dev
= encoder
->dev
;
1549 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
1550 if (connector
->encoder
== encoder
&& connector
->eld
[0])
1555 EXPORT_SYMBOL(drm_select_eld
);
1558 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1559 * @edid: monitor EDID information
1561 * Parse the CEA extension according to CEA-861-B.
1562 * Return true if HDMI, false if not or unknown.
1564 bool drm_detect_hdmi_monitor(struct edid
*edid
)
1568 int start_offset
, end_offset
;
1569 bool is_hdmi
= false;
1571 edid_ext
= drm_find_cea_extension(edid
);
1575 /* Data block offset in CEA extension block */
1577 end_offset
= edid_ext
[2];
1580 * Because HDMI identifier is in Vendor Specific Block,
1581 * search it from all data blocks of CEA extension.
1583 for (i
= start_offset
; i
< end_offset
;
1584 /* Increased by data block len */
1585 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1586 /* Find vendor specific block */
1587 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
1588 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
1589 edid_ext
[i
+ 3] << 16;
1590 /* Find HDMI identifier */
1591 if (hdmi_id
== HDMI_IDENTIFIER
)
1600 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
1603 * drm_detect_monitor_audio - check monitor audio capability
1605 * Monitor should have CEA extension block.
1606 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1607 * audio' only. If there is any audio extension block and supported
1608 * audio format, assume at least 'basic audio' support, even if 'basic
1609 * audio' is not defined in EDID.
1612 bool drm_detect_monitor_audio(struct edid
*edid
)
1616 bool has_audio
= false;
1617 int start_offset
, end_offset
;
1619 edid_ext
= drm_find_cea_extension(edid
);
1623 has_audio
= ((edid_ext
[3] & EDID_BASIC_AUDIO
) != 0);
1626 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1630 /* Data block offset in CEA extension block */
1632 end_offset
= edid_ext
[2];
1634 for (i
= start_offset
; i
< end_offset
;
1635 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1636 if ((edid_ext
[i
] >> 5) == AUDIO_BLOCK
) {
1638 for (j
= 1; j
< (edid_ext
[i
] & 0x1f); j
+= 3)
1639 DRM_DEBUG_KMS("CEA audio format %d\n",
1640 (edid_ext
[i
+ j
] >> 3) & 0xf);
1647 EXPORT_SYMBOL(drm_detect_monitor_audio
);
1650 * drm_add_display_info - pull display info out if present
1652 * @info: display info (attached to connector)
1654 * Grab any available display info and stuff it into the drm_display_info
1655 * structure that's part of the connector. Useful for tracking bpp and
1658 static void drm_add_display_info(struct edid
*edid
,
1659 struct drm_display_info
*info
)
1663 info
->width_mm
= edid
->width_cm
* 10;
1664 info
->height_mm
= edid
->height_cm
* 10;
1666 /* driver figures it out in this case */
1668 info
->color_formats
= 0;
1670 /* Only defined for 1.4 with digital displays */
1671 if (edid
->revision
< 4)
1674 if (!(edid
->input
& DRM_EDID_INPUT_DIGITAL
))
1677 switch (edid
->input
& DRM_EDID_DIGITAL_DEPTH_MASK
) {
1678 case DRM_EDID_DIGITAL_DEPTH_6
:
1681 case DRM_EDID_DIGITAL_DEPTH_8
:
1684 case DRM_EDID_DIGITAL_DEPTH_10
:
1687 case DRM_EDID_DIGITAL_DEPTH_12
:
1690 case DRM_EDID_DIGITAL_DEPTH_14
:
1693 case DRM_EDID_DIGITAL_DEPTH_16
:
1696 case DRM_EDID_DIGITAL_DEPTH_UNDEF
:
1702 info
->color_formats
= DRM_COLOR_FORMAT_RGB444
;
1703 if (info
->color_formats
& DRM_EDID_FEATURE_RGB_YCRCB444
)
1704 info
->color_formats
= DRM_COLOR_FORMAT_YCRCB444
;
1705 if (info
->color_formats
& DRM_EDID_FEATURE_RGB_YCRCB422
)
1706 info
->color_formats
= DRM_COLOR_FORMAT_YCRCB422
;
1708 /* Get data from CEA blocks if present */
1709 edid_ext
= drm_find_cea_extension(edid
);
1713 info
->cea_rev
= edid_ext
[1];
1717 * drm_add_edid_modes - add modes from EDID data, if available
1718 * @connector: connector we're probing
1721 * Add the specified modes to the connector's mode list.
1723 * Return number of modes added or 0 if we couldn't find any.
1725 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
1733 if (!drm_edid_is_valid(edid
)) {
1734 dev_warn(connector
->dev
->dev
, "%s: EDID invalid.\n",
1735 drm_get_connector_name(connector
));
1739 quirks
= edid_get_quirks(edid
);
1742 * EDID spec says modes should be preferred in this order:
1743 * - preferred detailed mode
1744 * - other detailed modes from base block
1745 * - detailed modes from extension blocks
1746 * - CVT 3-byte code modes
1747 * - standard timing codes
1748 * - established timing codes
1749 * - modes inferred from GTF or CVT range information
1751 * We get this pretty much right.
1753 * XXX order for additional mode types in extension blocks?
1755 num_modes
+= add_detailed_modes(connector
, edid
, quirks
);
1756 num_modes
+= add_cvt_modes(connector
, edid
);
1757 num_modes
+= add_standard_modes(connector
, edid
);
1758 num_modes
+= add_established_modes(connector
, edid
);
1759 num_modes
+= add_inferred_modes(connector
, edid
);
1760 num_modes
+= add_cea_modes(connector
, edid
);
1762 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
1763 edid_fixup_preferred(connector
, quirks
);
1765 drm_add_display_info(edid
, &connector
->display_info
);
1769 EXPORT_SYMBOL(drm_add_edid_modes
);
1772 * drm_add_modes_noedid - add modes for the connectors without EDID
1773 * @connector: connector we're probing
1774 * @hdisplay: the horizontal display limit
1775 * @vdisplay: the vertical display limit
1777 * Add the specified modes to the connector's mode list. Only when the
1778 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1780 * Return number of modes added or 0 if we couldn't find any.
1782 int drm_add_modes_noedid(struct drm_connector
*connector
,
1783 int hdisplay
, int vdisplay
)
1785 int i
, count
, num_modes
= 0;
1786 struct drm_display_mode
*mode
;
1787 struct drm_device
*dev
= connector
->dev
;
1789 count
= sizeof(drm_dmt_modes
) / sizeof(struct drm_display_mode
);
1795 for (i
= 0; i
< count
; i
++) {
1796 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
1797 if (hdisplay
&& vdisplay
) {
1799 * Only when two are valid, they will be used to check
1800 * whether the mode should be added to the mode list of
1803 if (ptr
->hdisplay
> hdisplay
||
1804 ptr
->vdisplay
> vdisplay
)
1807 if (drm_mode_vrefresh(ptr
) > 61)
1809 mode
= drm_mode_duplicate(dev
, ptr
);
1811 drm_mode_probed_add(connector
, mode
);
1817 EXPORT_SYMBOL(drm_add_modes_noedid
);