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>
35 #include "drm_edid_modes.h"
37 #define version_greater(edid, maj, min) \
38 (((edid)->version > (maj)) || \
39 ((edid)->version == (maj) && (edid)->revision > (min)))
41 #define EDID_EST_TIMINGS 16
42 #define EDID_STD_TIMINGS 8
43 #define EDID_DETAILED_TIMINGS 4
46 * EDID blocks out in the wild have a variety of bugs, try to collect
47 * them here (note that userspace may work around broken monitors first,
48 * but fixes should make their way here so that the kernel "just works"
49 * on as many displays as possible).
52 /* First detailed mode wrong, use largest 60Hz mode */
53 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
54 /* Reported 135MHz pixel clock is too high, needs adjustment */
55 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
56 /* Prefer the largest mode at 75 Hz */
57 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
58 /* Detail timing is in cm not mm */
59 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
60 /* Detailed timing descriptors have bogus size values, so just take the
61 * maximum size and use that.
63 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
64 /* Monitor forgot to set the first detailed is preferred bit. */
65 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
66 /* use +hsync +vsync for detailed mode */
67 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
69 struct detailed_mode_closure
{
70 struct drm_connector
*connector
;
82 static struct edid_quirk
{
86 } edid_quirk_list
[] = {
88 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60
},
90 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60
},
92 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
94 /* Belinea 10 15 55 */
95 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60
},
96 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60
},
98 /* Envision Peripherals, Inc. EN-7100e */
99 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH
},
100 /* Envision EN2028 */
101 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60
},
103 /* Funai Electronics PM36B */
104 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75
|
105 EDID_QUIRK_DETAILED_IN_CM
},
107 /* LG Philips LCD LP154W01-A5 */
108 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
109 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
111 /* Philips 107p5 CRT */
112 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
115 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
117 /* Samsung SyncMaster 205BW. Note: irony */
118 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP
},
119 /* Samsung SyncMaster 22[5-6]BW */
120 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60
},
121 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60
},
124 /*** DDC fetch and block validation ***/
126 static const u8 edid_header
[] = {
127 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
131 * Sanity check the EDID block (base or extension). Return 0 if the block
132 * doesn't check out, or 1 if it's valid.
135 drm_edid_block_valid(u8
*raw_edid
)
139 struct edid
*edid
= (struct edid
*)raw_edid
;
141 if (raw_edid
[0] == 0x00) {
144 for (i
= 0; i
< sizeof(edid_header
); i
++)
145 if (raw_edid
[i
] == edid_header
[i
])
149 else if (score
>= 6) {
150 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
151 memcpy(raw_edid
, edid_header
, sizeof(edid_header
));
157 for (i
= 0; i
< EDID_LENGTH
; i
++)
160 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum
);
162 /* allow CEA to slide through, switches mangle this */
163 if (raw_edid
[0] != 0x02)
167 /* per-block-type checks */
168 switch (raw_edid
[0]) {
170 if (edid
->version
!= 1) {
171 DRM_ERROR("EDID has major version %d, instead of 1\n", edid
->version
);
175 if (edid
->revision
> 4)
176 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
187 printk(KERN_ERR
"Raw EDID:\n");
188 print_hex_dump_bytes(KERN_ERR
, DUMP_PREFIX_NONE
, raw_edid
, EDID_LENGTH
);
189 printk(KERN_ERR
"\n");
195 * drm_edid_is_valid - sanity check EDID data
198 * Sanity-check an entire EDID record (including extensions)
200 bool drm_edid_is_valid(struct edid
*edid
)
203 u8
*raw
= (u8
*)edid
;
208 for (i
= 0; i
<= edid
->extensions
; i
++)
209 if (!drm_edid_block_valid(raw
+ i
* EDID_LENGTH
))
214 EXPORT_SYMBOL(drm_edid_is_valid
);
216 #define DDC_ADDR 0x50
217 #define DDC_SEGMENT_ADDR 0x30
219 * Get EDID information via I2C.
221 * \param adapter : i2c device adaptor
222 * \param buf : EDID data buffer to be filled
223 * \param len : EDID data buffer length
224 * \return 0 on success or -1 on failure.
226 * Try to fetch EDID information by calling i2c driver function.
229 drm_do_probe_ddc_edid(struct i2c_adapter
*adapter
, unsigned char *buf
,
232 unsigned char start
= block
* EDID_LENGTH
;
233 int ret
, retries
= 5;
235 /* The core i2c driver will automatically retry the transfer if the
236 * adapter reports EAGAIN. However, we find that bit-banging transfers
237 * are susceptible to errors under a heavily loaded machine and
238 * generate spurious NAKs and timeouts. Retrying the transfer
239 * of the individual block a few times seems to overcome this.
242 struct i2c_msg msgs
[] = {
255 ret
= i2c_transfer(adapter
, msgs
, 2);
256 } while (ret
!= 2 && --retries
);
258 return ret
== 2 ? 0 : -1;
261 static bool drm_edid_is_zero(u8
*in_edid
, int length
)
264 u32
*raw_edid
= (u32
*)in_edid
;
266 for (i
= 0; i
< length
/ 4; i
++)
267 if (*(raw_edid
+ i
) != 0)
273 drm_do_get_edid(struct drm_connector
*connector
, struct i2c_adapter
*adapter
)
275 int i
, j
= 0, valid_extensions
= 0;
278 if ((block
= kmalloc(EDID_LENGTH
, GFP_KERNEL
)) == NULL
)
281 /* base block fetch */
282 for (i
= 0; i
< 4; i
++) {
283 if (drm_do_probe_ddc_edid(adapter
, block
, 0, EDID_LENGTH
))
285 if (drm_edid_block_valid(block
))
287 if (i
== 0 && drm_edid_is_zero(block
, EDID_LENGTH
)) {
288 connector
->null_edid_counter
++;
295 /* if there's no extensions, we're done */
296 if (block
[0x7e] == 0)
299 new = krealloc(block
, (block
[0x7e] + 1) * EDID_LENGTH
, GFP_KERNEL
);
304 for (j
= 1; j
<= block
[0x7e]; j
++) {
305 for (i
= 0; i
< 4; i
++) {
306 if (drm_do_probe_ddc_edid(adapter
,
307 block
+ (valid_extensions
+ 1) * EDID_LENGTH
,
310 if (drm_edid_block_valid(block
+ (valid_extensions
+ 1) * EDID_LENGTH
)) {
316 dev_warn(connector
->dev
->dev
,
317 "%s: Ignoring invalid EDID block %d.\n",
318 drm_get_connector_name(connector
), j
);
321 if (valid_extensions
!= block
[0x7e]) {
322 block
[EDID_LENGTH
-1] += block
[0x7e] - valid_extensions
;
323 block
[0x7e] = valid_extensions
;
324 new = krealloc(block
, (valid_extensions
+ 1) * EDID_LENGTH
, GFP_KERNEL
);
333 dev_warn(connector
->dev
->dev
, "%s: EDID block %d invalid.\n",
334 drm_get_connector_name(connector
), j
);
342 * Probe DDC presence.
344 * \param adapter : i2c device adaptor
345 * \return 1 on success
348 drm_probe_ddc(struct i2c_adapter
*adapter
)
352 return (drm_do_probe_ddc_edid(adapter
, &out
, 0, 1) == 0);
356 * drm_get_edid - get EDID data, if available
357 * @connector: connector we're probing
358 * @adapter: i2c adapter to use for DDC
360 * Poke the given i2c channel to grab EDID data if possible. If found,
361 * attach it to the connector.
363 * Return edid data or NULL if we couldn't find any.
365 struct edid
*drm_get_edid(struct drm_connector
*connector
,
366 struct i2c_adapter
*adapter
)
368 struct edid
*edid
= NULL
;
370 if (drm_probe_ddc(adapter
))
371 edid
= (struct edid
*)drm_do_get_edid(connector
, adapter
);
373 connector
->display_info
.raw_edid
= (char *)edid
;
378 EXPORT_SYMBOL(drm_get_edid
);
380 /*** EDID parsing ***/
383 * edid_vendor - match a string against EDID's obfuscated vendor field
384 * @edid: EDID to match
385 * @vendor: vendor string
387 * Returns true if @vendor is in @edid, false otherwise
389 static bool edid_vendor(struct edid
*edid
, char *vendor
)
393 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
394 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
395 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
396 edid_vendor
[2] = (edid
->mfg_id
[1] & 0x1f) + '@';
398 return !strncmp(edid_vendor
, vendor
, 3);
402 * edid_get_quirks - return quirk flags for a given EDID
403 * @edid: EDID to process
405 * This tells subsequent routines what fixes they need to apply.
407 static u32
edid_get_quirks(struct edid
*edid
)
409 struct edid_quirk
*quirk
;
412 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
413 quirk
= &edid_quirk_list
[i
];
415 if (edid_vendor(edid
, quirk
->vendor
) &&
416 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
417 return quirk
->quirks
;
423 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
424 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
427 * edid_fixup_preferred - set preferred modes based on quirk list
428 * @connector: has mode list to fix up
429 * @quirks: quirks list
431 * Walk the mode list for @connector, clearing the preferred status
432 * on existing modes and setting it anew for the right mode ala @quirks.
434 static void edid_fixup_preferred(struct drm_connector
*connector
,
437 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
438 int target_refresh
= 0;
440 if (list_empty(&connector
->probed_modes
))
443 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
445 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
448 preferred_mode
= list_first_entry(&connector
->probed_modes
,
449 struct drm_display_mode
, head
);
451 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
452 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
454 if (cur_mode
== preferred_mode
)
457 /* Largest mode is preferred */
458 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
459 preferred_mode
= cur_mode
;
461 /* At a given size, try to get closest to target refresh */
462 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
463 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
464 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
465 preferred_mode
= cur_mode
;
469 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
472 struct drm_display_mode
*drm_mode_find_dmt(struct drm_device
*dev
,
473 int hsize
, int vsize
, int fresh
)
475 struct drm_display_mode
*mode
= NULL
;
478 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
479 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
480 if (hsize
== ptr
->hdisplay
&&
481 vsize
== ptr
->vdisplay
&&
482 fresh
== drm_mode_vrefresh(ptr
)) {
483 /* get the expected default mode */
484 mode
= drm_mode_duplicate(dev
, ptr
);
490 EXPORT_SYMBOL(drm_mode_find_dmt
);
492 typedef void detailed_cb(struct detailed_timing
*timing
, void *closure
);
495 cea_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
498 u8 rev
= ext
[0x01], d
= ext
[0x02];
499 u8
*det_base
= ext
+ d
;
506 /* have to infer how many blocks we have, check pixel clock */
507 for (i
= 0; i
< 6; i
++)
508 if (det_base
[18*i
] || det_base
[18*i
+1])
513 n
= min(ext
[0x03] & 0x0f, 6);
517 for (i
= 0; i
< n
; i
++)
518 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
522 vtb_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
524 unsigned int i
, n
= min((int)ext
[0x02], 6);
525 u8
*det_base
= ext
+ 5;
528 return; /* unknown version */
530 for (i
= 0; i
< n
; i
++)
531 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
535 drm_for_each_detailed_block(u8
*raw_edid
, detailed_cb
*cb
, void *closure
)
538 struct edid
*edid
= (struct edid
*)raw_edid
;
543 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++)
544 cb(&(edid
->detailed_timings
[i
]), closure
);
546 for (i
= 1; i
<= raw_edid
[0x7e]; i
++) {
547 u8
*ext
= raw_edid
+ (i
* EDID_LENGTH
);
550 cea_for_each_detailed_block(ext
, cb
, closure
);
553 vtb_for_each_detailed_block(ext
, cb
, closure
);
562 is_rb(struct detailed_timing
*t
, void *data
)
565 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
)
567 *(bool *)data
= true;
570 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
572 drm_monitor_supports_rb(struct edid
*edid
)
574 if (edid
->revision
>= 4) {
576 drm_for_each_detailed_block((u8
*)edid
, is_rb
, &ret
);
580 return ((edid
->input
& DRM_EDID_INPUT_DIGITAL
) != 0);
584 find_gtf2(struct detailed_timing
*t
, void *data
)
587 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
&& r
[10] == 0x02)
591 /* Secondary GTF curve kicks in above some break frequency */
593 drm_gtf2_hbreak(struct edid
*edid
)
596 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
597 return r
? (r
[12] * 2) : 0;
601 drm_gtf2_2c(struct edid
*edid
)
604 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
605 return r
? r
[13] : 0;
609 drm_gtf2_m(struct edid
*edid
)
612 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
613 return r
? (r
[15] << 8) + r
[14] : 0;
617 drm_gtf2_k(struct edid
*edid
)
620 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
621 return r
? r
[16] : 0;
625 drm_gtf2_2j(struct edid
*edid
)
628 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
629 return r
? r
[17] : 0;
633 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
634 * @edid: EDID block to scan
636 static int standard_timing_level(struct edid
*edid
)
638 if (edid
->revision
>= 2) {
639 if (edid
->revision
>= 4 && (edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
))
641 if (drm_gtf2_hbreak(edid
))
649 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
650 * monitors fill with ascii space (0x20) instead.
653 bad_std_timing(u8 a
, u8 b
)
655 return (a
== 0x00 && b
== 0x00) ||
656 (a
== 0x01 && b
== 0x01) ||
657 (a
== 0x20 && b
== 0x20);
661 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
662 * @t: standard timing params
663 * @timing_level: standard timing level
665 * Take the standard timing params (in this case width, aspect, and refresh)
666 * and convert them into a real mode using CVT/GTF/DMT.
668 static struct drm_display_mode
*
669 drm_mode_std(struct drm_connector
*connector
, struct edid
*edid
,
670 struct std_timing
*t
, int revision
)
672 struct drm_device
*dev
= connector
->dev
;
673 struct drm_display_mode
*m
, *mode
= NULL
;
676 unsigned aspect_ratio
= (t
->vfreq_aspect
& EDID_TIMING_ASPECT_MASK
)
677 >> EDID_TIMING_ASPECT_SHIFT
;
678 unsigned vfreq
= (t
->vfreq_aspect
& EDID_TIMING_VFREQ_MASK
)
679 >> EDID_TIMING_VFREQ_SHIFT
;
680 int timing_level
= standard_timing_level(edid
);
682 if (bad_std_timing(t
->hsize
, t
->vfreq_aspect
))
685 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
686 hsize
= t
->hsize
* 8 + 248;
687 /* vrefresh_rate = vfreq + 60 */
688 vrefresh_rate
= vfreq
+ 60;
689 /* the vdisplay is calculated based on the aspect ratio */
690 if (aspect_ratio
== 0) {
694 vsize
= (hsize
* 10) / 16;
695 } else if (aspect_ratio
== 1)
696 vsize
= (hsize
* 3) / 4;
697 else if (aspect_ratio
== 2)
698 vsize
= (hsize
* 4) / 5;
700 vsize
= (hsize
* 9) / 16;
702 /* HDTV hack, part 1 */
703 if (vrefresh_rate
== 60 &&
704 ((hsize
== 1360 && vsize
== 765) ||
705 (hsize
== 1368 && vsize
== 769))) {
711 * If this connector already has a mode for this size and refresh
712 * rate (because it came from detailed or CVT info), use that
713 * instead. This way we don't have to guess at interlace or
716 list_for_each_entry(m
, &connector
->probed_modes
, head
)
717 if (m
->hdisplay
== hsize
&& m
->vdisplay
== vsize
&&
718 drm_mode_vrefresh(m
) == vrefresh_rate
)
721 /* HDTV hack, part 2 */
722 if (hsize
== 1366 && vsize
== 768 && vrefresh_rate
== 60) {
723 mode
= drm_cvt_mode(dev
, 1366, 768, vrefresh_rate
, 0, 0,
725 mode
->hdisplay
= 1366;
726 mode
->hsync_start
= mode
->hsync_start
- 1;
727 mode
->hsync_end
= mode
->hsync_end
- 1;
731 /* check whether it can be found in default mode table */
732 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
);
736 switch (timing_level
) {
740 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
744 * This is potentially wrong if there's ever a monitor with
745 * more than one ranges section, each claiming a different
746 * secondary GTF curve. Please don't do that.
748 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
749 if (drm_mode_hsync(mode
) > drm_gtf2_hbreak(edid
)) {
751 mode
= drm_gtf_mode_complex(dev
, hsize
, vsize
,
760 mode
= drm_cvt_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0,
768 * EDID is delightfully ambiguous about how interlaced modes are to be
769 * encoded. Our internal representation is of frame height, but some
770 * HDTV detailed timings are encoded as field height.
772 * The format list here is from CEA, in frame size. Technically we
773 * should be checking refresh rate too. Whatever.
776 drm_mode_do_interlace_quirk(struct drm_display_mode
*mode
,
777 struct detailed_pixel_timing
*pt
)
780 static const struct {
782 } cea_interlaced
[] = {
792 if (!(pt
->misc
& DRM_EDID_PT_INTERLACED
))
795 for (i
= 0; i
< ARRAY_SIZE(cea_interlaced
); i
++) {
796 if ((mode
->hdisplay
== cea_interlaced
[i
].w
) &&
797 (mode
->vdisplay
== cea_interlaced
[i
].h
/ 2)) {
799 mode
->vsync_start
*= 2;
800 mode
->vsync_end
*= 2;
806 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
810 * drm_mode_detailed - create a new mode from an EDID detailed timing section
811 * @dev: DRM device (needed to create new mode)
813 * @timing: EDID detailed timing info
814 * @quirks: quirks to apply
816 * An EDID detailed timing block contains enough info for us to create and
817 * return a new struct drm_display_mode.
819 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
821 struct detailed_timing
*timing
,
824 struct drm_display_mode
*mode
;
825 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
826 unsigned hactive
= (pt
->hactive_hblank_hi
& 0xf0) << 4 | pt
->hactive_lo
;
827 unsigned vactive
= (pt
->vactive_vblank_hi
& 0xf0) << 4 | pt
->vactive_lo
;
828 unsigned hblank
= (pt
->hactive_hblank_hi
& 0xf) << 8 | pt
->hblank_lo
;
829 unsigned vblank
= (pt
->vactive_vblank_hi
& 0xf) << 8 | pt
->vblank_lo
;
830 unsigned hsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc0) << 2 | pt
->hsync_offset_lo
;
831 unsigned hsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x30) << 4 | pt
->hsync_pulse_width_lo
;
832 unsigned vsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc) >> 2 | pt
->vsync_offset_pulse_width_lo
>> 4;
833 unsigned vsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x3) << 4 | (pt
->vsync_offset_pulse_width_lo
& 0xf);
835 /* ignore tiny modes */
836 if (hactive
< 64 || vactive
< 64)
839 if (pt
->misc
& DRM_EDID_PT_STEREO
) {
840 printk(KERN_WARNING
"stereo mode not supported\n");
843 if (!(pt
->misc
& DRM_EDID_PT_SEPARATE_SYNC
)) {
844 printk(KERN_WARNING
"composite sync not supported\n");
847 /* it is incorrect if hsync/vsync width is zero */
848 if (!hsync_pulse_width
|| !vsync_pulse_width
) {
849 DRM_DEBUG_KMS("Incorrect Detailed timing. "
850 "Wrong Hsync/Vsync pulse width\n");
853 mode
= drm_mode_create(dev
);
857 mode
->type
= DRM_MODE_TYPE_DRIVER
;
859 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
860 timing
->pixel_clock
= cpu_to_le16(1088);
862 mode
->clock
= le16_to_cpu(timing
->pixel_clock
) * 10;
864 mode
->hdisplay
= hactive
;
865 mode
->hsync_start
= mode
->hdisplay
+ hsync_offset
;
866 mode
->hsync_end
= mode
->hsync_start
+ hsync_pulse_width
;
867 mode
->htotal
= mode
->hdisplay
+ hblank
;
869 mode
->vdisplay
= vactive
;
870 mode
->vsync_start
= mode
->vdisplay
+ vsync_offset
;
871 mode
->vsync_end
= mode
->vsync_start
+ vsync_pulse_width
;
872 mode
->vtotal
= mode
->vdisplay
+ vblank
;
874 /* Some EDIDs have bogus h/vtotal values */
875 if (mode
->hsync_end
> mode
->htotal
)
876 mode
->htotal
= mode
->hsync_end
+ 1;
877 if (mode
->vsync_end
> mode
->vtotal
)
878 mode
->vtotal
= mode
->vsync_end
+ 1;
880 drm_mode_do_interlace_quirk(mode
, pt
);
882 drm_mode_set_name(mode
);
884 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
885 pt
->misc
|= DRM_EDID_PT_HSYNC_POSITIVE
| DRM_EDID_PT_VSYNC_POSITIVE
;
888 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_HSYNC_POSITIVE
) ?
889 DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
890 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_VSYNC_POSITIVE
) ?
891 DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
893 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_height_mm_hi
& 0xf0) << 4;
894 mode
->height_mm
= pt
->height_mm_lo
| (pt
->width_height_mm_hi
& 0xf) << 8;
896 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
897 mode
->width_mm
*= 10;
898 mode
->height_mm
*= 10;
901 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
902 mode
->width_mm
= edid
->width_cm
* 10;
903 mode
->height_mm
= edid
->height_cm
* 10;
910 mode_is_rb(const struct drm_display_mode
*mode
)
912 return (mode
->htotal
- mode
->hdisplay
== 160) &&
913 (mode
->hsync_end
- mode
->hdisplay
== 80) &&
914 (mode
->hsync_end
- mode
->hsync_start
== 32) &&
915 (mode
->vsync_start
- mode
->vdisplay
== 3);
919 mode_in_hsync_range(const struct drm_display_mode
*mode
,
920 struct edid
*edid
, u8
*t
)
922 int hsync
, hmin
, hmax
;
925 if (edid
->revision
>= 4)
926 hmin
+= ((t
[4] & 0x04) ? 255 : 0);
928 if (edid
->revision
>= 4)
929 hmax
+= ((t
[4] & 0x08) ? 255 : 0);
930 hsync
= drm_mode_hsync(mode
);
932 return (hsync
<= hmax
&& hsync
>= hmin
);
936 mode_in_vsync_range(const struct drm_display_mode
*mode
,
937 struct edid
*edid
, u8
*t
)
939 int vsync
, vmin
, vmax
;
942 if (edid
->revision
>= 4)
943 vmin
+= ((t
[4] & 0x01) ? 255 : 0);
945 if (edid
->revision
>= 4)
946 vmax
+= ((t
[4] & 0x02) ? 255 : 0);
947 vsync
= drm_mode_vrefresh(mode
);
949 return (vsync
<= vmax
&& vsync
>= vmin
);
953 range_pixel_clock(struct edid
*edid
, u8
*t
)
956 if (t
[9] == 0 || t
[9] == 255)
959 /* 1.4 with CVT support gives us real precision, yay */
960 if (edid
->revision
>= 4 && t
[10] == 0x04)
961 return (t
[9] * 10000) - ((t
[12] >> 2) * 250);
963 /* 1.3 is pathetic, so fuzz up a bit */
964 return t
[9] * 10000 + 5001;
968 mode_in_range(const struct drm_display_mode
*mode
, struct edid
*edid
,
969 struct detailed_timing
*timing
)
972 u8
*t
= (u8
*)timing
;
974 if (!mode_in_hsync_range(mode
, edid
, t
))
977 if (!mode_in_vsync_range(mode
, edid
, t
))
980 if ((max_clock
= range_pixel_clock(edid
, t
)))
981 if (mode
->clock
> max_clock
)
984 /* 1.4 max horizontal check */
985 if (edid
->revision
>= 4 && t
[10] == 0x04)
986 if (t
[13] && mode
->hdisplay
> 8 * (t
[13] + (256 * (t
[12]&0x3))))
989 if (mode_is_rb(mode
) && !drm_monitor_supports_rb(edid
))
996 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
997 * need to account for them.
1000 drm_gtf_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
1001 struct detailed_timing
*timing
)
1004 struct drm_display_mode
*newmode
;
1005 struct drm_device
*dev
= connector
->dev
;
1007 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
1008 if (mode_in_range(drm_dmt_modes
+ i
, edid
, timing
)) {
1009 newmode
= drm_mode_duplicate(dev
, &drm_dmt_modes
[i
]);
1011 drm_mode_probed_add(connector
, newmode
);
1021 do_inferred_modes(struct detailed_timing
*timing
, void *c
)
1023 struct detailed_mode_closure
*closure
= c
;
1024 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1025 int gtf
= (closure
->edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
);
1027 if (gtf
&& data
->type
== EDID_DETAIL_MONITOR_RANGE
)
1028 closure
->modes
+= drm_gtf_modes_for_range(closure
->connector
,
1034 add_inferred_modes(struct drm_connector
*connector
, struct edid
*edid
)
1036 struct detailed_mode_closure closure
= {
1037 connector
, edid
, 0, 0, 0
1040 if (version_greater(edid
, 1, 0))
1041 drm_for_each_detailed_block((u8
*)edid
, do_inferred_modes
,
1044 return closure
.modes
;
1048 drm_est3_modes(struct drm_connector
*connector
, struct detailed_timing
*timing
)
1050 int i
, j
, m
, modes
= 0;
1051 struct drm_display_mode
*mode
;
1052 u8
*est
= ((u8
*)timing
) + 5;
1054 for (i
= 0; i
< 6; i
++) {
1055 for (j
= 7; j
> 0; j
--) {
1056 m
= (i
* 8) + (7 - j
);
1057 if (m
>= ARRAY_SIZE(est3_modes
))
1059 if (est
[i
] & (1 << j
)) {
1060 mode
= drm_mode_find_dmt(connector
->dev
,
1064 /*, est3_modes[m].rb */);
1066 drm_mode_probed_add(connector
, mode
);
1077 do_established_modes(struct detailed_timing
*timing
, void *c
)
1079 struct detailed_mode_closure
*closure
= c
;
1080 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1082 if (data
->type
== EDID_DETAIL_EST_TIMINGS
)
1083 closure
->modes
+= drm_est3_modes(closure
->connector
, timing
);
1087 * add_established_modes - get est. modes from EDID and add them
1088 * @edid: EDID block to scan
1090 * Each EDID block contains a bitmap of the supported "established modes" list
1091 * (defined above). Tease them out and add them to the global modes list.
1094 add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
1096 struct drm_device
*dev
= connector
->dev
;
1097 unsigned long est_bits
= edid
->established_timings
.t1
|
1098 (edid
->established_timings
.t2
<< 8) |
1099 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
1101 struct detailed_mode_closure closure
= {
1102 connector
, edid
, 0, 0, 0
1105 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++) {
1106 if (est_bits
& (1<<i
)) {
1107 struct drm_display_mode
*newmode
;
1108 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
1110 drm_mode_probed_add(connector
, newmode
);
1116 if (version_greater(edid
, 1, 0))
1117 drm_for_each_detailed_block((u8
*)edid
,
1118 do_established_modes
, &closure
);
1120 return modes
+ closure
.modes
;
1124 do_standard_modes(struct detailed_timing
*timing
, void *c
)
1126 struct detailed_mode_closure
*closure
= c
;
1127 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1128 struct drm_connector
*connector
= closure
->connector
;
1129 struct edid
*edid
= closure
->edid
;
1131 if (data
->type
== EDID_DETAIL_STD_MODES
) {
1133 for (i
= 0; i
< 6; i
++) {
1134 struct std_timing
*std
;
1135 struct drm_display_mode
*newmode
;
1137 std
= &data
->data
.timings
[i
];
1138 newmode
= drm_mode_std(connector
, edid
, std
,
1141 drm_mode_probed_add(connector
, newmode
);
1149 * add_standard_modes - get std. modes from EDID and add them
1150 * @edid: EDID block to scan
1152 * Standard modes can be calculated using the appropriate standard (DMT,
1153 * GTF or CVT. Grab them from @edid and add them to the list.
1156 add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
1159 struct detailed_mode_closure closure
= {
1160 connector
, edid
, 0, 0, 0
1163 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
1164 struct drm_display_mode
*newmode
;
1166 newmode
= drm_mode_std(connector
, edid
,
1167 &edid
->standard_timings
[i
],
1170 drm_mode_probed_add(connector
, newmode
);
1175 if (version_greater(edid
, 1, 0))
1176 drm_for_each_detailed_block((u8
*)edid
, do_standard_modes
,
1179 /* XXX should also look for standard codes in VTB blocks */
1181 return modes
+ closure
.modes
;
1184 static int drm_cvt_modes(struct drm_connector
*connector
,
1185 struct detailed_timing
*timing
)
1187 int i
, j
, modes
= 0;
1188 struct drm_display_mode
*newmode
;
1189 struct drm_device
*dev
= connector
->dev
;
1190 struct cvt_timing
*cvt
;
1191 const int rates
[] = { 60, 85, 75, 60, 50 };
1192 const u8 empty
[3] = { 0, 0, 0 };
1194 for (i
= 0; i
< 4; i
++) {
1195 int uninitialized_var(width
), height
;
1196 cvt
= &(timing
->data
.other_data
.data
.cvt
[i
]);
1198 if (!memcmp(cvt
->code
, empty
, 3))
1201 height
= (cvt
->code
[0] + ((cvt
->code
[1] & 0xf0) << 4) + 1) * 2;
1202 switch (cvt
->code
[1] & 0x0c) {
1204 width
= height
* 4 / 3;
1207 width
= height
* 16 / 9;
1210 width
= height
* 16 / 10;
1213 width
= height
* 15 / 9;
1217 for (j
= 1; j
< 5; j
++) {
1218 if (cvt
->code
[2] & (1 << j
)) {
1219 newmode
= drm_cvt_mode(dev
, width
, height
,
1223 drm_mode_probed_add(connector
, newmode
);
1234 do_cvt_mode(struct detailed_timing
*timing
, void *c
)
1236 struct detailed_mode_closure
*closure
= c
;
1237 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1239 if (data
->type
== EDID_DETAIL_CVT_3BYTE
)
1240 closure
->modes
+= drm_cvt_modes(closure
->connector
, timing
);
1244 add_cvt_modes(struct drm_connector
*connector
, struct edid
*edid
)
1246 struct detailed_mode_closure closure
= {
1247 connector
, edid
, 0, 0, 0
1250 if (version_greater(edid
, 1, 2))
1251 drm_for_each_detailed_block((u8
*)edid
, do_cvt_mode
, &closure
);
1253 /* XXX should also look for CVT codes in VTB blocks */
1255 return closure
.modes
;
1259 do_detailed_mode(struct detailed_timing
*timing
, void *c
)
1261 struct detailed_mode_closure
*closure
= c
;
1262 struct drm_display_mode
*newmode
;
1264 if (timing
->pixel_clock
) {
1265 newmode
= drm_mode_detailed(closure
->connector
->dev
,
1266 closure
->edid
, timing
,
1271 if (closure
->preferred
)
1272 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
1274 drm_mode_probed_add(closure
->connector
, newmode
);
1276 closure
->preferred
= 0;
1281 * add_detailed_modes - Add modes from detailed timings
1282 * @connector: attached connector
1283 * @edid: EDID block to scan
1284 * @quirks: quirks to apply
1287 add_detailed_modes(struct drm_connector
*connector
, struct edid
*edid
,
1290 struct detailed_mode_closure closure
= {
1298 if (closure
.preferred
&& !version_greater(edid
, 1, 3))
1300 (edid
->features
& DRM_EDID_FEATURE_PREFERRED_TIMING
);
1302 drm_for_each_detailed_block((u8
*)edid
, do_detailed_mode
, &closure
);
1304 return closure
.modes
;
1307 #define HDMI_IDENTIFIER 0x000C03
1308 #define AUDIO_BLOCK 0x01
1309 #define VENDOR_BLOCK 0x03
1310 #define EDID_BASIC_AUDIO (1 << 6)
1313 * Search EDID for CEA extension block.
1315 u8
*drm_find_cea_extension(struct edid
*edid
)
1317 u8
*edid_ext
= NULL
;
1320 /* No EDID or EDID extensions */
1321 if (edid
== NULL
|| edid
->extensions
== 0)
1324 /* Find CEA extension */
1325 for (i
= 0; i
< edid
->extensions
; i
++) {
1326 edid_ext
= (u8
*)edid
+ EDID_LENGTH
* (i
+ 1);
1327 if (edid_ext
[0] == CEA_EXT
)
1331 if (i
== edid
->extensions
)
1336 EXPORT_SYMBOL(drm_find_cea_extension
);
1339 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1340 * @edid: monitor EDID information
1342 * Parse the CEA extension according to CEA-861-B.
1343 * Return true if HDMI, false if not or unknown.
1345 bool drm_detect_hdmi_monitor(struct edid
*edid
)
1349 int start_offset
, end_offset
;
1350 bool is_hdmi
= false;
1352 edid_ext
= drm_find_cea_extension(edid
);
1356 /* Data block offset in CEA extension block */
1358 end_offset
= edid_ext
[2];
1361 * Because HDMI identifier is in Vendor Specific Block,
1362 * search it from all data blocks of CEA extension.
1364 for (i
= start_offset
; i
< end_offset
;
1365 /* Increased by data block len */
1366 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1367 /* Find vendor specific block */
1368 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
1369 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
1370 edid_ext
[i
+ 3] << 16;
1371 /* Find HDMI identifier */
1372 if (hdmi_id
== HDMI_IDENTIFIER
)
1381 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
1384 * drm_detect_monitor_audio - check monitor audio capability
1386 * Monitor should have CEA extension block.
1387 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1388 * audio' only. If there is any audio extension block and supported
1389 * audio format, assume at least 'basic audio' support, even if 'basic
1390 * audio' is not defined in EDID.
1393 bool drm_detect_monitor_audio(struct edid
*edid
)
1397 bool has_audio
= false;
1398 int start_offset
, end_offset
;
1400 edid_ext
= drm_find_cea_extension(edid
);
1404 has_audio
= ((edid_ext
[3] & EDID_BASIC_AUDIO
) != 0);
1407 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1411 /* Data block offset in CEA extension block */
1413 end_offset
= edid_ext
[2];
1415 for (i
= start_offset
; i
< end_offset
;
1416 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1417 if ((edid_ext
[i
] >> 5) == AUDIO_BLOCK
) {
1419 for (j
= 1; j
< (edid_ext
[i
] & 0x1f); j
+= 3)
1420 DRM_DEBUG_KMS("CEA audio format %d\n",
1421 (edid_ext
[i
+ j
] >> 3) & 0xf);
1428 EXPORT_SYMBOL(drm_detect_monitor_audio
);
1431 * drm_add_display_info - pull display info out if present
1433 * @info: display info (attached to connector)
1435 * Grab any available display info and stuff it into the drm_display_info
1436 * structure that's part of the connector. Useful for tracking bpp and
1439 static void drm_add_display_info(struct edid
*edid
,
1440 struct drm_display_info
*info
)
1442 info
->width_mm
= edid
->width_cm
* 10;
1443 info
->height_mm
= edid
->height_cm
* 10;
1445 /* driver figures it out in this case */
1447 info
->color_formats
= 0;
1449 /* Only defined for 1.4 with digital displays */
1450 if (edid
->revision
< 4)
1453 if (!(edid
->input
& DRM_EDID_INPUT_DIGITAL
))
1456 switch (edid
->input
& DRM_EDID_DIGITAL_DEPTH_MASK
) {
1457 case DRM_EDID_DIGITAL_DEPTH_6
:
1460 case DRM_EDID_DIGITAL_DEPTH_8
:
1463 case DRM_EDID_DIGITAL_DEPTH_10
:
1466 case DRM_EDID_DIGITAL_DEPTH_12
:
1469 case DRM_EDID_DIGITAL_DEPTH_14
:
1472 case DRM_EDID_DIGITAL_DEPTH_16
:
1475 case DRM_EDID_DIGITAL_DEPTH_UNDEF
:
1481 info
->color_formats
= DRM_COLOR_FORMAT_RGB444
;
1482 if (info
->color_formats
& DRM_EDID_FEATURE_RGB_YCRCB444
)
1483 info
->color_formats
= DRM_COLOR_FORMAT_YCRCB444
;
1484 if (info
->color_formats
& DRM_EDID_FEATURE_RGB_YCRCB422
)
1485 info
->color_formats
= DRM_COLOR_FORMAT_YCRCB422
;
1489 * drm_add_edid_modes - add modes from EDID data, if available
1490 * @connector: connector we're probing
1493 * Add the specified modes to the connector's mode list.
1495 * Return number of modes added or 0 if we couldn't find any.
1497 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
1505 if (!drm_edid_is_valid(edid
)) {
1506 dev_warn(connector
->dev
->dev
, "%s: EDID invalid.\n",
1507 drm_get_connector_name(connector
));
1511 quirks
= edid_get_quirks(edid
);
1514 * EDID spec says modes should be preferred in this order:
1515 * - preferred detailed mode
1516 * - other detailed modes from base block
1517 * - detailed modes from extension blocks
1518 * - CVT 3-byte code modes
1519 * - standard timing codes
1520 * - established timing codes
1521 * - modes inferred from GTF or CVT range information
1523 * We get this pretty much right.
1525 * XXX order for additional mode types in extension blocks?
1527 num_modes
+= add_detailed_modes(connector
, edid
, quirks
);
1528 num_modes
+= add_cvt_modes(connector
, edid
);
1529 num_modes
+= add_standard_modes(connector
, edid
);
1530 num_modes
+= add_established_modes(connector
, edid
);
1531 num_modes
+= add_inferred_modes(connector
, edid
);
1533 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
1534 edid_fixup_preferred(connector
, quirks
);
1536 drm_add_display_info(edid
, &connector
->display_info
);
1540 EXPORT_SYMBOL(drm_add_edid_modes
);
1543 * drm_add_modes_noedid - add modes for the connectors without EDID
1544 * @connector: connector we're probing
1545 * @hdisplay: the horizontal display limit
1546 * @vdisplay: the vertical display limit
1548 * Add the specified modes to the connector's mode list. Only when the
1549 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1551 * Return number of modes added or 0 if we couldn't find any.
1553 int drm_add_modes_noedid(struct drm_connector
*connector
,
1554 int hdisplay
, int vdisplay
)
1556 int i
, count
, num_modes
= 0;
1557 struct drm_display_mode
*mode
;
1558 struct drm_device
*dev
= connector
->dev
;
1560 count
= sizeof(drm_dmt_modes
) / sizeof(struct drm_display_mode
);
1566 for (i
= 0; i
< count
; i
++) {
1567 const struct drm_display_mode
*ptr
= &drm_dmt_modes
[i
];
1568 if (hdisplay
&& vdisplay
) {
1570 * Only when two are valid, they will be used to check
1571 * whether the mode should be added to the mode list of
1574 if (ptr
->hdisplay
> hdisplay
||
1575 ptr
->vdisplay
> vdisplay
)
1578 if (drm_mode_vrefresh(ptr
) > 61)
1580 mode
= drm_mode_duplicate(dev
, ptr
);
1582 drm_mode_probed_add(connector
, mode
);
1588 EXPORT_SYMBOL(drm_add_modes_noedid
);