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 DRM_ERROR("Raw EDID:\n");
188 print_hex_dump_bytes(KERN_ERR
, DUMP_PREFIX_NONE
, raw_edid
, EDID_LENGTH
);
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 struct i2c_msg msgs
[] = {
247 if (i2c_transfer(adapter
, msgs
, 2) == 2)
254 drm_do_get_edid(struct drm_connector
*connector
, struct i2c_adapter
*adapter
)
259 if ((block
= kmalloc(EDID_LENGTH
, GFP_KERNEL
)) == NULL
)
262 /* base block fetch */
263 for (i
= 0; i
< 4; i
++) {
264 if (drm_do_probe_ddc_edid(adapter
, block
, 0, EDID_LENGTH
))
266 if (drm_edid_block_valid(block
))
272 /* if there's no extensions, we're done */
273 if (block
[0x7e] == 0)
276 new = krealloc(block
, (block
[0x7e] + 1) * EDID_LENGTH
, GFP_KERNEL
);
281 for (j
= 1; j
<= block
[0x7e]; j
++) {
282 for (i
= 0; i
< 4; i
++) {
283 if (drm_do_probe_ddc_edid(adapter
, block
, j
,
286 if (drm_edid_block_valid(block
+ j
* EDID_LENGTH
))
296 dev_warn(connector
->dev
->dev
, "%s: EDID block %d invalid.\n",
297 drm_get_connector_name(connector
), j
);
305 * Probe DDC presence.
307 * \param adapter : i2c device adaptor
308 * \return 1 on success
311 drm_probe_ddc(struct i2c_adapter
*adapter
)
315 return (drm_do_probe_ddc_edid(adapter
, &out
, 0, 1) == 0);
319 * drm_get_edid - get EDID data, if available
320 * @connector: connector we're probing
321 * @adapter: i2c adapter to use for DDC
323 * Poke the given i2c channel to grab EDID data if possible. If found,
324 * attach it to the connector.
326 * Return edid data or NULL if we couldn't find any.
328 struct edid
*drm_get_edid(struct drm_connector
*connector
,
329 struct i2c_adapter
*adapter
)
331 struct edid
*edid
= NULL
;
333 if (drm_probe_ddc(adapter
))
334 edid
= (struct edid
*)drm_do_get_edid(connector
, adapter
);
336 connector
->display_info
.raw_edid
= (char *)edid
;
341 EXPORT_SYMBOL(drm_get_edid
);
343 /*** EDID parsing ***/
346 * edid_vendor - match a string against EDID's obfuscated vendor field
347 * @edid: EDID to match
348 * @vendor: vendor string
350 * Returns true if @vendor is in @edid, false otherwise
352 static bool edid_vendor(struct edid
*edid
, char *vendor
)
356 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
357 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
358 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
359 edid_vendor
[2] = (edid
->mfg_id
[1] & 0x1f) + '@';
361 return !strncmp(edid_vendor
, vendor
, 3);
365 * edid_get_quirks - return quirk flags for a given EDID
366 * @edid: EDID to process
368 * This tells subsequent routines what fixes they need to apply.
370 static u32
edid_get_quirks(struct edid
*edid
)
372 struct edid_quirk
*quirk
;
375 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
376 quirk
= &edid_quirk_list
[i
];
378 if (edid_vendor(edid
, quirk
->vendor
) &&
379 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
380 return quirk
->quirks
;
386 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
387 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
390 * edid_fixup_preferred - set preferred modes based on quirk list
391 * @connector: has mode list to fix up
392 * @quirks: quirks list
394 * Walk the mode list for @connector, clearing the preferred status
395 * on existing modes and setting it anew for the right mode ala @quirks.
397 static void edid_fixup_preferred(struct drm_connector
*connector
,
400 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
401 int target_refresh
= 0;
403 if (list_empty(&connector
->probed_modes
))
406 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
408 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
411 preferred_mode
= list_first_entry(&connector
->probed_modes
,
412 struct drm_display_mode
, head
);
414 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
415 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
417 if (cur_mode
== preferred_mode
)
420 /* Largest mode is preferred */
421 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
422 preferred_mode
= cur_mode
;
424 /* At a given size, try to get closest to target refresh */
425 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
426 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
427 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
428 preferred_mode
= cur_mode
;
432 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
435 struct drm_display_mode
*drm_mode_find_dmt(struct drm_device
*dev
,
436 int hsize
, int vsize
, int fresh
)
439 struct drm_display_mode
*ptr
, *mode
;
442 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
443 ptr
= &drm_dmt_modes
[i
];
444 if (hsize
== ptr
->hdisplay
&&
445 vsize
== ptr
->vdisplay
&&
446 fresh
== drm_mode_vrefresh(ptr
)) {
447 /* get the expected default mode */
448 mode
= drm_mode_duplicate(dev
, ptr
);
454 EXPORT_SYMBOL(drm_mode_find_dmt
);
456 typedef void detailed_cb(struct detailed_timing
*timing
, void *closure
);
459 cea_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
462 u8 rev
= ext
[0x01], d
= ext
[0x02];
463 u8
*det_base
= ext
+ d
;
470 /* have to infer how many blocks we have, check pixel clock */
471 for (i
= 0; i
< 6; i
++)
472 if (det_base
[18*i
] || det_base
[18*i
+1])
477 n
= min(ext
[0x03] & 0x0f, 6);
481 for (i
= 0; i
< n
; i
++)
482 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
486 vtb_for_each_detailed_block(u8
*ext
, detailed_cb
*cb
, void *closure
)
488 unsigned int i
, n
= min((int)ext
[0x02], 6);
489 u8
*det_base
= ext
+ 5;
492 return; /* unknown version */
494 for (i
= 0; i
< n
; i
++)
495 cb((struct detailed_timing
*)(det_base
+ 18 * i
), closure
);
499 drm_for_each_detailed_block(u8
*raw_edid
, detailed_cb
*cb
, void *closure
)
502 struct edid
*edid
= (struct edid
*)raw_edid
;
507 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++)
508 cb(&(edid
->detailed_timings
[i
]), closure
);
510 for (i
= 1; i
<= raw_edid
[0x7e]; i
++) {
511 u8
*ext
= raw_edid
+ (i
* EDID_LENGTH
);
514 cea_for_each_detailed_block(ext
, cb
, closure
);
517 vtb_for_each_detailed_block(ext
, cb
, closure
);
526 is_rb(struct detailed_timing
*t
, void *data
)
529 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
)
531 *(bool *)data
= true;
534 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
536 drm_monitor_supports_rb(struct edid
*edid
)
538 if (edid
->revision
>= 4) {
540 drm_for_each_detailed_block((u8
*)edid
, is_rb
, &ret
);
544 return ((edid
->input
& DRM_EDID_INPUT_DIGITAL
) != 0);
548 find_gtf2(struct detailed_timing
*t
, void *data
)
551 if (r
[3] == EDID_DETAIL_MONITOR_RANGE
&& r
[10] == 0x02)
555 /* Secondary GTF curve kicks in above some break frequency */
557 drm_gtf2_hbreak(struct edid
*edid
)
560 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
561 return r
? (r
[12] * 2) : 0;
565 drm_gtf2_2c(struct edid
*edid
)
568 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
569 return r
? r
[13] : 0;
573 drm_gtf2_m(struct edid
*edid
)
576 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
577 return r
? (r
[15] << 8) + r
[14] : 0;
581 drm_gtf2_k(struct edid
*edid
)
584 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
585 return r
? r
[16] : 0;
589 drm_gtf2_2j(struct edid
*edid
)
592 drm_for_each_detailed_block((u8
*)edid
, find_gtf2
, &r
);
593 return r
? r
[17] : 0;
597 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
598 * @edid: EDID block to scan
600 static int standard_timing_level(struct edid
*edid
)
602 if (edid
->revision
>= 2) {
603 if (edid
->revision
>= 4 && (edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
))
605 if (drm_gtf2_hbreak(edid
))
613 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
614 * monitors fill with ascii space (0x20) instead.
617 bad_std_timing(u8 a
, u8 b
)
619 return (a
== 0x00 && b
== 0x00) ||
620 (a
== 0x01 && b
== 0x01) ||
621 (a
== 0x20 && b
== 0x20);
625 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
626 * @t: standard timing params
627 * @timing_level: standard timing level
629 * Take the standard timing params (in this case width, aspect, and refresh)
630 * and convert them into a real mode using CVT/GTF/DMT.
632 static struct drm_display_mode
*
633 drm_mode_std(struct drm_connector
*connector
, struct edid
*edid
,
634 struct std_timing
*t
, int revision
)
636 struct drm_device
*dev
= connector
->dev
;
637 struct drm_display_mode
*m
, *mode
= NULL
;
640 unsigned aspect_ratio
= (t
->vfreq_aspect
& EDID_TIMING_ASPECT_MASK
)
641 >> EDID_TIMING_ASPECT_SHIFT
;
642 unsigned vfreq
= (t
->vfreq_aspect
& EDID_TIMING_VFREQ_MASK
)
643 >> EDID_TIMING_VFREQ_SHIFT
;
644 int timing_level
= standard_timing_level(edid
);
646 if (bad_std_timing(t
->hsize
, t
->vfreq_aspect
))
649 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
650 hsize
= t
->hsize
* 8 + 248;
651 /* vrefresh_rate = vfreq + 60 */
652 vrefresh_rate
= vfreq
+ 60;
653 /* the vdisplay is calculated based on the aspect ratio */
654 if (aspect_ratio
== 0) {
658 vsize
= (hsize
* 10) / 16;
659 } else if (aspect_ratio
== 1)
660 vsize
= (hsize
* 3) / 4;
661 else if (aspect_ratio
== 2)
662 vsize
= (hsize
* 4) / 5;
664 vsize
= (hsize
* 9) / 16;
666 /* HDTV hack, part 1 */
667 if (vrefresh_rate
== 60 &&
668 ((hsize
== 1360 && vsize
== 765) ||
669 (hsize
== 1368 && vsize
== 769))) {
675 * If this connector already has a mode for this size and refresh
676 * rate (because it came from detailed or CVT info), use that
677 * instead. This way we don't have to guess at interlace or
680 list_for_each_entry(m
, &connector
->probed_modes
, head
)
681 if (m
->hdisplay
== hsize
&& m
->vdisplay
== vsize
&&
682 drm_mode_vrefresh(m
) == vrefresh_rate
)
685 /* HDTV hack, part 2 */
686 if (hsize
== 1366 && vsize
== 768 && vrefresh_rate
== 60) {
687 mode
= drm_cvt_mode(dev
, 1366, 768, vrefresh_rate
, 0, 0,
689 mode
->hdisplay
= 1366;
690 mode
->hsync_start
= mode
->hsync_start
- 1;
691 mode
->hsync_end
= mode
->hsync_end
- 1;
695 /* check whether it can be found in default mode table */
696 mode
= drm_mode_find_dmt(dev
, hsize
, vsize
, vrefresh_rate
);
700 switch (timing_level
) {
704 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
708 * This is potentially wrong if there's ever a monitor with
709 * more than one ranges section, each claiming a different
710 * secondary GTF curve. Please don't do that.
712 mode
= drm_gtf_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0);
713 if (drm_mode_hsync(mode
) > drm_gtf2_hbreak(edid
)) {
715 mode
= drm_gtf_mode_complex(dev
, hsize
, vsize
,
724 mode
= drm_cvt_mode(dev
, hsize
, vsize
, vrefresh_rate
, 0, 0,
732 * EDID is delightfully ambiguous about how interlaced modes are to be
733 * encoded. Our internal representation is of frame height, but some
734 * HDTV detailed timings are encoded as field height.
736 * The format list here is from CEA, in frame size. Technically we
737 * should be checking refresh rate too. Whatever.
740 drm_mode_do_interlace_quirk(struct drm_display_mode
*mode
,
741 struct detailed_pixel_timing
*pt
)
744 static const struct {
746 } cea_interlaced
[] = {
756 if (!(pt
->misc
& DRM_EDID_PT_INTERLACED
))
759 for (i
= 0; i
< ARRAY_SIZE(cea_interlaced
); i
++) {
760 if ((mode
->hdisplay
== cea_interlaced
[i
].w
) &&
761 (mode
->vdisplay
== cea_interlaced
[i
].h
/ 2)) {
763 mode
->vsync_start
*= 2;
764 mode
->vsync_end
*= 2;
770 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
774 * drm_mode_detailed - create a new mode from an EDID detailed timing section
775 * @dev: DRM device (needed to create new mode)
777 * @timing: EDID detailed timing info
778 * @quirks: quirks to apply
780 * An EDID detailed timing block contains enough info for us to create and
781 * return a new struct drm_display_mode.
783 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
785 struct detailed_timing
*timing
,
788 struct drm_display_mode
*mode
;
789 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
790 unsigned hactive
= (pt
->hactive_hblank_hi
& 0xf0) << 4 | pt
->hactive_lo
;
791 unsigned vactive
= (pt
->vactive_vblank_hi
& 0xf0) << 4 | pt
->vactive_lo
;
792 unsigned hblank
= (pt
->hactive_hblank_hi
& 0xf) << 8 | pt
->hblank_lo
;
793 unsigned vblank
= (pt
->vactive_vblank_hi
& 0xf) << 8 | pt
->vblank_lo
;
794 unsigned hsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc0) << 2 | pt
->hsync_offset_lo
;
795 unsigned hsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x30) << 4 | pt
->hsync_pulse_width_lo
;
796 unsigned vsync_offset
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0xc) >> 2 | pt
->vsync_offset_pulse_width_lo
>> 4;
797 unsigned vsync_pulse_width
= (pt
->hsync_vsync_offset_pulse_width_hi
& 0x3) << 4 | (pt
->vsync_offset_pulse_width_lo
& 0xf);
799 /* ignore tiny modes */
800 if (hactive
< 64 || vactive
< 64)
803 if (pt
->misc
& DRM_EDID_PT_STEREO
) {
804 printk(KERN_WARNING
"stereo mode not supported\n");
807 if (!(pt
->misc
& DRM_EDID_PT_SEPARATE_SYNC
)) {
808 printk(KERN_WARNING
"composite sync not supported\n");
811 /* it is incorrect if hsync/vsync width is zero */
812 if (!hsync_pulse_width
|| !vsync_pulse_width
) {
813 DRM_DEBUG_KMS("Incorrect Detailed timing. "
814 "Wrong Hsync/Vsync pulse width\n");
817 mode
= drm_mode_create(dev
);
821 mode
->type
= DRM_MODE_TYPE_DRIVER
;
823 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
824 timing
->pixel_clock
= cpu_to_le16(1088);
826 mode
->clock
= le16_to_cpu(timing
->pixel_clock
) * 10;
828 mode
->hdisplay
= hactive
;
829 mode
->hsync_start
= mode
->hdisplay
+ hsync_offset
;
830 mode
->hsync_end
= mode
->hsync_start
+ hsync_pulse_width
;
831 mode
->htotal
= mode
->hdisplay
+ hblank
;
833 mode
->vdisplay
= vactive
;
834 mode
->vsync_start
= mode
->vdisplay
+ vsync_offset
;
835 mode
->vsync_end
= mode
->vsync_start
+ vsync_pulse_width
;
836 mode
->vtotal
= mode
->vdisplay
+ vblank
;
838 /* Some EDIDs have bogus h/vtotal values */
839 if (mode
->hsync_end
> mode
->htotal
)
840 mode
->htotal
= mode
->hsync_end
+ 1;
841 if (mode
->vsync_end
> mode
->vtotal
)
842 mode
->vtotal
= mode
->vsync_end
+ 1;
844 drm_mode_do_interlace_quirk(mode
, pt
);
846 drm_mode_set_name(mode
);
848 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
849 pt
->misc
|= DRM_EDID_PT_HSYNC_POSITIVE
| DRM_EDID_PT_VSYNC_POSITIVE
;
852 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_HSYNC_POSITIVE
) ?
853 DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
854 mode
->flags
|= (pt
->misc
& DRM_EDID_PT_VSYNC_POSITIVE
) ?
855 DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
857 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_height_mm_hi
& 0xf0) << 4;
858 mode
->height_mm
= pt
->height_mm_lo
| (pt
->width_height_mm_hi
& 0xf) << 8;
860 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
861 mode
->width_mm
*= 10;
862 mode
->height_mm
*= 10;
865 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
866 mode
->width_mm
= edid
->width_cm
* 10;
867 mode
->height_mm
= edid
->height_cm
* 10;
874 mode_is_rb(struct drm_display_mode
*mode
)
876 return (mode
->htotal
- mode
->hdisplay
== 160) &&
877 (mode
->hsync_end
- mode
->hdisplay
== 80) &&
878 (mode
->hsync_end
- mode
->hsync_start
== 32) &&
879 (mode
->vsync_start
- mode
->vdisplay
== 3);
883 mode_in_hsync_range(struct drm_display_mode
*mode
, struct edid
*edid
, u8
*t
)
885 int hsync
, hmin
, hmax
;
888 if (edid
->revision
>= 4)
889 hmin
+= ((t
[4] & 0x04) ? 255 : 0);
891 if (edid
->revision
>= 4)
892 hmax
+= ((t
[4] & 0x08) ? 255 : 0);
893 hsync
= drm_mode_hsync(mode
);
895 return (hsync
<= hmax
&& hsync
>= hmin
);
899 mode_in_vsync_range(struct drm_display_mode
*mode
, struct edid
*edid
, u8
*t
)
901 int vsync
, vmin
, vmax
;
904 if (edid
->revision
>= 4)
905 vmin
+= ((t
[4] & 0x01) ? 255 : 0);
907 if (edid
->revision
>= 4)
908 vmax
+= ((t
[4] & 0x02) ? 255 : 0);
909 vsync
= drm_mode_vrefresh(mode
);
911 return (vsync
<= vmax
&& vsync
>= vmin
);
915 range_pixel_clock(struct edid
*edid
, u8
*t
)
918 if (t
[9] == 0 || t
[9] == 255)
921 /* 1.4 with CVT support gives us real precision, yay */
922 if (edid
->revision
>= 4 && t
[10] == 0x04)
923 return (t
[9] * 10000) - ((t
[12] >> 2) * 250);
925 /* 1.3 is pathetic, so fuzz up a bit */
926 return t
[9] * 10000 + 5001;
930 mode_in_range(struct drm_display_mode
*mode
, struct edid
*edid
,
931 struct detailed_timing
*timing
)
934 u8
*t
= (u8
*)timing
;
936 if (!mode_in_hsync_range(mode
, edid
, t
))
939 if (!mode_in_vsync_range(mode
, edid
, t
))
942 if ((max_clock
= range_pixel_clock(edid
, t
)))
943 if (mode
->clock
> max_clock
)
946 /* 1.4 max horizontal check */
947 if (edid
->revision
>= 4 && t
[10] == 0x04)
948 if (t
[13] && mode
->hdisplay
> 8 * (t
[13] + (256 * (t
[12]&0x3))))
951 if (mode_is_rb(mode
) && !drm_monitor_supports_rb(edid
))
958 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
959 * need to account for them.
962 drm_gtf_modes_for_range(struct drm_connector
*connector
, struct edid
*edid
,
963 struct detailed_timing
*timing
)
966 struct drm_display_mode
*newmode
;
967 struct drm_device
*dev
= connector
->dev
;
969 for (i
= 0; i
< drm_num_dmt_modes
; i
++) {
970 if (mode_in_range(drm_dmt_modes
+ i
, edid
, timing
)) {
971 newmode
= drm_mode_duplicate(dev
, &drm_dmt_modes
[i
]);
973 drm_mode_probed_add(connector
, newmode
);
983 do_inferred_modes(struct detailed_timing
*timing
, void *c
)
985 struct detailed_mode_closure
*closure
= c
;
986 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
987 int gtf
= (closure
->edid
->features
& DRM_EDID_FEATURE_DEFAULT_GTF
);
989 if (gtf
&& data
->type
== EDID_DETAIL_MONITOR_RANGE
)
990 closure
->modes
+= drm_gtf_modes_for_range(closure
->connector
,
996 add_inferred_modes(struct drm_connector
*connector
, struct edid
*edid
)
998 struct detailed_mode_closure closure
= {
999 connector
, edid
, 0, 0, 0
1002 if (version_greater(edid
, 1, 0))
1003 drm_for_each_detailed_block((u8
*)edid
, do_inferred_modes
,
1006 return closure
.modes
;
1010 drm_est3_modes(struct drm_connector
*connector
, struct detailed_timing
*timing
)
1012 int i
, j
, m
, modes
= 0;
1013 struct drm_display_mode
*mode
;
1014 u8
*est
= ((u8
*)timing
) + 5;
1016 for (i
= 0; i
< 6; i
++) {
1017 for (j
= 7; j
> 0; j
--) {
1018 m
= (i
* 8) + (7 - j
);
1019 if (m
>= ARRAY_SIZE(est3_modes
))
1021 if (est
[i
] & (1 << j
)) {
1022 mode
= drm_mode_find_dmt(connector
->dev
,
1026 /*, est3_modes[m].rb */);
1028 drm_mode_probed_add(connector
, mode
);
1039 do_established_modes(struct detailed_timing
*timing
, void *c
)
1041 struct detailed_mode_closure
*closure
= c
;
1042 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1044 if (data
->type
== EDID_DETAIL_EST_TIMINGS
)
1045 closure
->modes
+= drm_est3_modes(closure
->connector
, timing
);
1049 * add_established_modes - get est. modes from EDID and add them
1050 * @edid: EDID block to scan
1052 * Each EDID block contains a bitmap of the supported "established modes" list
1053 * (defined above). Tease them out and add them to the global modes list.
1056 add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
1058 struct drm_device
*dev
= connector
->dev
;
1059 unsigned long est_bits
= edid
->established_timings
.t1
|
1060 (edid
->established_timings
.t2
<< 8) |
1061 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
1063 struct detailed_mode_closure closure
= {
1064 connector
, edid
, 0, 0, 0
1067 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++) {
1068 if (est_bits
& (1<<i
)) {
1069 struct drm_display_mode
*newmode
;
1070 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
1072 drm_mode_probed_add(connector
, newmode
);
1078 if (version_greater(edid
, 1, 0))
1079 drm_for_each_detailed_block((u8
*)edid
,
1080 do_established_modes
, &closure
);
1082 return modes
+ closure
.modes
;
1086 do_standard_modes(struct detailed_timing
*timing
, void *c
)
1088 struct detailed_mode_closure
*closure
= c
;
1089 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1090 struct drm_connector
*connector
= closure
->connector
;
1091 struct edid
*edid
= closure
->edid
;
1093 if (data
->type
== EDID_DETAIL_STD_MODES
) {
1095 for (i
= 0; i
< 6; i
++) {
1096 struct std_timing
*std
;
1097 struct drm_display_mode
*newmode
;
1099 std
= &data
->data
.timings
[i
];
1100 newmode
= drm_mode_std(connector
, edid
, std
,
1103 drm_mode_probed_add(connector
, newmode
);
1111 * add_standard_modes - get std. modes from EDID and add them
1112 * @edid: EDID block to scan
1114 * Standard modes can be calculated using the appropriate standard (DMT,
1115 * GTF or CVT. Grab them from @edid and add them to the list.
1118 add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
1121 struct detailed_mode_closure closure
= {
1122 connector
, edid
, 0, 0, 0
1125 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
1126 struct drm_display_mode
*newmode
;
1128 newmode
= drm_mode_std(connector
, edid
,
1129 &edid
->standard_timings
[i
],
1132 drm_mode_probed_add(connector
, newmode
);
1137 if (version_greater(edid
, 1, 0))
1138 drm_for_each_detailed_block((u8
*)edid
, do_standard_modes
,
1141 /* XXX should also look for standard codes in VTB blocks */
1143 return modes
+ closure
.modes
;
1146 static int drm_cvt_modes(struct drm_connector
*connector
,
1147 struct detailed_timing
*timing
)
1149 int i
, j
, modes
= 0;
1150 struct drm_display_mode
*newmode
;
1151 struct drm_device
*dev
= connector
->dev
;
1152 struct cvt_timing
*cvt
;
1153 const int rates
[] = { 60, 85, 75, 60, 50 };
1154 const u8 empty
[3] = { 0, 0, 0 };
1156 for (i
= 0; i
< 4; i
++) {
1157 int uninitialized_var(width
), height
;
1158 cvt
= &(timing
->data
.other_data
.data
.cvt
[i
]);
1160 if (!memcmp(cvt
->code
, empty
, 3))
1163 height
= (cvt
->code
[0] + ((cvt
->code
[1] & 0xf0) << 4) + 1) * 2;
1164 switch (cvt
->code
[1] & 0x0c) {
1166 width
= height
* 4 / 3;
1169 width
= height
* 16 / 9;
1172 width
= height
* 16 / 10;
1175 width
= height
* 15 / 9;
1179 for (j
= 1; j
< 5; j
++) {
1180 if (cvt
->code
[2] & (1 << j
)) {
1181 newmode
= drm_cvt_mode(dev
, width
, height
,
1185 drm_mode_probed_add(connector
, newmode
);
1196 do_cvt_mode(struct detailed_timing
*timing
, void *c
)
1198 struct detailed_mode_closure
*closure
= c
;
1199 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
1201 if (data
->type
== EDID_DETAIL_CVT_3BYTE
)
1202 closure
->modes
+= drm_cvt_modes(closure
->connector
, timing
);
1206 add_cvt_modes(struct drm_connector
*connector
, struct edid
*edid
)
1208 struct detailed_mode_closure closure
= {
1209 connector
, edid
, 0, 0, 0
1212 if (version_greater(edid
, 1, 2))
1213 drm_for_each_detailed_block((u8
*)edid
, do_cvt_mode
, &closure
);
1215 /* XXX should also look for CVT codes in VTB blocks */
1217 return closure
.modes
;
1221 do_detailed_mode(struct detailed_timing
*timing
, void *c
)
1223 struct detailed_mode_closure
*closure
= c
;
1224 struct drm_display_mode
*newmode
;
1226 if (timing
->pixel_clock
) {
1227 newmode
= drm_mode_detailed(closure
->connector
->dev
,
1228 closure
->edid
, timing
,
1233 if (closure
->preferred
)
1234 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
1236 drm_mode_probed_add(closure
->connector
, newmode
);
1238 closure
->preferred
= 0;
1243 * add_detailed_modes - Add modes from detailed timings
1244 * @connector: attached connector
1245 * @edid: EDID block to scan
1246 * @quirks: quirks to apply
1249 add_detailed_modes(struct drm_connector
*connector
, struct edid
*edid
,
1252 struct detailed_mode_closure closure
= {
1260 if (closure
.preferred
&& !version_greater(edid
, 1, 3))
1262 (edid
->features
& DRM_EDID_FEATURE_PREFERRED_TIMING
);
1264 drm_for_each_detailed_block((u8
*)edid
, do_detailed_mode
, &closure
);
1266 return closure
.modes
;
1269 #define HDMI_IDENTIFIER 0x000C03
1270 #define AUDIO_BLOCK 0x01
1271 #define VENDOR_BLOCK 0x03
1272 #define EDID_BASIC_AUDIO (1 << 6)
1275 * Search EDID for CEA extension block.
1277 static u8
*drm_find_cea_extension(struct edid
*edid
)
1279 u8
*edid_ext
= NULL
;
1282 /* No EDID or EDID extensions */
1283 if (edid
== NULL
|| edid
->extensions
== 0)
1286 /* Find CEA extension */
1287 for (i
= 0; i
< edid
->extensions
; i
++) {
1288 edid_ext
= (u8
*)edid
+ EDID_LENGTH
* (i
+ 1);
1289 if (edid_ext
[0] == CEA_EXT
)
1293 if (i
== edid
->extensions
)
1300 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1301 * @edid: monitor EDID information
1303 * Parse the CEA extension according to CEA-861-B.
1304 * Return true if HDMI, false if not or unknown.
1306 bool drm_detect_hdmi_monitor(struct edid
*edid
)
1310 int start_offset
, end_offset
;
1311 bool is_hdmi
= false;
1313 edid_ext
= drm_find_cea_extension(edid
);
1317 /* Data block offset in CEA extension block */
1319 end_offset
= edid_ext
[2];
1322 * Because HDMI identifier is in Vendor Specific Block,
1323 * search it from all data blocks of CEA extension.
1325 for (i
= start_offset
; i
< end_offset
;
1326 /* Increased by data block len */
1327 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1328 /* Find vendor specific block */
1329 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
1330 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
1331 edid_ext
[i
+ 3] << 16;
1332 /* Find HDMI identifier */
1333 if (hdmi_id
== HDMI_IDENTIFIER
)
1342 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
1345 * drm_detect_monitor_audio - check monitor audio capability
1347 * Monitor should have CEA extension block.
1348 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1349 * audio' only. If there is any audio extension block and supported
1350 * audio format, assume at least 'basic audio' support, even if 'basic
1351 * audio' is not defined in EDID.
1354 bool drm_detect_monitor_audio(struct edid
*edid
)
1358 bool has_audio
= false;
1359 int start_offset
, end_offset
;
1361 edid_ext
= drm_find_cea_extension(edid
);
1365 has_audio
= ((edid_ext
[3] & EDID_BASIC_AUDIO
) != 0);
1368 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1372 /* Data block offset in CEA extension block */
1374 end_offset
= edid_ext
[2];
1376 for (i
= start_offset
; i
< end_offset
;
1377 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
1378 if ((edid_ext
[i
] >> 5) == AUDIO_BLOCK
) {
1380 for (j
= 1; j
< (edid_ext
[i
] & 0x1f); j
+= 3)
1381 DRM_DEBUG_KMS("CEA audio format %d\n",
1382 (edid_ext
[i
+ j
] >> 3) & 0xf);
1389 EXPORT_SYMBOL(drm_detect_monitor_audio
);
1392 * drm_add_edid_modes - add modes from EDID data, if available
1393 * @connector: connector we're probing
1396 * Add the specified modes to the connector's mode list.
1398 * Return number of modes added or 0 if we couldn't find any.
1400 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
1408 if (!drm_edid_is_valid(edid
)) {
1409 dev_warn(connector
->dev
->dev
, "%s: EDID invalid.\n",
1410 drm_get_connector_name(connector
));
1414 quirks
= edid_get_quirks(edid
);
1417 * EDID spec says modes should be preferred in this order:
1418 * - preferred detailed mode
1419 * - other detailed modes from base block
1420 * - detailed modes from extension blocks
1421 * - CVT 3-byte code modes
1422 * - standard timing codes
1423 * - established timing codes
1424 * - modes inferred from GTF or CVT range information
1426 * We get this pretty much right.
1428 * XXX order for additional mode types in extension blocks?
1430 num_modes
+= add_detailed_modes(connector
, edid
, quirks
);
1431 num_modes
+= add_cvt_modes(connector
, edid
);
1432 num_modes
+= add_standard_modes(connector
, edid
);
1433 num_modes
+= add_established_modes(connector
, edid
);
1434 num_modes
+= add_inferred_modes(connector
, edid
);
1436 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
1437 edid_fixup_preferred(connector
, quirks
);
1439 connector
->display_info
.width_mm
= edid
->width_cm
* 10;
1440 connector
->display_info
.height_mm
= edid
->height_cm
* 10;
1444 EXPORT_SYMBOL(drm_add_edid_modes
);
1447 * drm_add_modes_noedid - add modes for the connectors without EDID
1448 * @connector: connector we're probing
1449 * @hdisplay: the horizontal display limit
1450 * @vdisplay: the vertical display limit
1452 * Add the specified modes to the connector's mode list. Only when the
1453 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1455 * Return number of modes added or 0 if we couldn't find any.
1457 int drm_add_modes_noedid(struct drm_connector
*connector
,
1458 int hdisplay
, int vdisplay
)
1460 int i
, count
, num_modes
= 0;
1461 struct drm_display_mode
*mode
, *ptr
;
1462 struct drm_device
*dev
= connector
->dev
;
1464 count
= sizeof(drm_dmt_modes
) / sizeof(struct drm_display_mode
);
1470 for (i
= 0; i
< count
; i
++) {
1471 ptr
= &drm_dmt_modes
[i
];
1472 if (hdisplay
&& vdisplay
) {
1474 * Only when two are valid, they will be used to check
1475 * whether the mode should be added to the mode list of
1478 if (ptr
->hdisplay
> hdisplay
||
1479 ptr
->vdisplay
> vdisplay
)
1482 if (drm_mode_vrefresh(ptr
) > 61)
1484 mode
= drm_mode_duplicate(dev
, ptr
);
1486 drm_mode_probed_add(connector
, mode
);
1492 EXPORT_SYMBOL(drm_add_modes_noedid
);