2 * Copyright (c) 2006 Luc Verhaegen (quirks list)
3 * Copyright (c) 2007-2008 Intel Corporation
4 * Jesse Barnes <jesse.barnes@intel.com>
6 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
8 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sub license,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice (including the
18 * next paragraph) shall be included in all copies or substantial portions
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
29 #include <linux/kernel.h>
30 #include <linux/i2c.h>
31 #include <linux/i2c-algo-bit.h>
37 * - support EDID 1.4 (incl. CE blocks)
41 * EDID blocks out in the wild have a variety of bugs, try to collect
42 * them here (note that userspace may work around broken monitors first,
43 * but fixes should make their way here so that the kernel "just works"
44 * on as many displays as possible).
47 /* First detailed mode wrong, use largest 60Hz mode */
48 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
49 /* Reported 135MHz pixel clock is too high, needs adjustment */
50 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
51 /* Prefer the largest mode at 75 Hz */
52 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
53 /* Detail timing is in cm not mm */
54 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
55 /* Detailed timing descriptors have bogus size values, so just take the
56 * maximum size and use that.
58 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
59 /* Monitor forgot to set the first detailed is preferred bit. */
60 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
61 /* use +hsync +vsync for detailed mode */
62 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
64 static struct edid_quirk
{
68 } edid_quirk_list
[] = {
70 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60
},
72 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60
},
74 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
76 /* Belinea 10 15 55 */
77 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60
},
78 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60
},
80 /* Envision Peripherals, Inc. EN-7100e */
81 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH
},
83 /* Funai Electronics PM36B */
84 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75
|
85 EDID_QUIRK_DETAILED_IN_CM
},
87 /* LG Philips LCD LP154W01-A5 */
88 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
89 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
},
91 /* Philips 107p5 CRT */
92 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
95 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED
},
97 /* Samsung SyncMaster 205BW. Note: irony */
98 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP
},
99 /* Samsung SyncMaster 22[5-6]BW */
100 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60
},
101 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60
},
105 /* Valid EDID header has these bytes */
106 static u8 edid_header
[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
109 * edid_is_valid - sanity check EDID data
112 * Sanity check the EDID block by looking at the header, the version number
113 * and the checksum. Return 0 if the EDID doesn't check out, or 1 if it's
116 static bool edid_is_valid(struct edid
*edid
)
120 u8
*raw_edid
= (u8
*)edid
;
122 if (memcmp(edid
->header
, edid_header
, sizeof(edid_header
)))
124 if (edid
->version
!= 1) {
125 DRM_ERROR("EDID has major version %d, instead of 1\n", edid
->version
);
128 if (edid
->revision
> 3) {
129 DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid
->revision
);
133 for (i
= 0; i
< EDID_LENGTH
; i
++)
136 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum
);
144 DRM_ERROR("Raw EDID:\n");
145 print_hex_dump_bytes(KERN_ERR
, DUMP_PREFIX_NONE
, raw_edid
, EDID_LENGTH
);
152 * edid_vendor - match a string against EDID's obfuscated vendor field
153 * @edid: EDID to match
154 * @vendor: vendor string
156 * Returns true if @vendor is in @edid, false otherwise
158 static bool edid_vendor(struct edid
*edid
, char *vendor
)
162 edid_vendor
[0] = ((edid
->mfg_id
[0] & 0x7c) >> 2) + '@';
163 edid_vendor
[1] = (((edid
->mfg_id
[0] & 0x3) << 3) |
164 ((edid
->mfg_id
[1] & 0xe0) >> 5)) + '@';
165 edid_vendor
[2] = (edid
->mfg_id
[2] & 0x1f) + '@';
167 return !strncmp(edid_vendor
, vendor
, 3);
171 * edid_get_quirks - return quirk flags for a given EDID
172 * @edid: EDID to process
174 * This tells subsequent routines what fixes they need to apply.
176 static u32
edid_get_quirks(struct edid
*edid
)
178 struct edid_quirk
*quirk
;
181 for (i
= 0; i
< ARRAY_SIZE(edid_quirk_list
); i
++) {
182 quirk
= &edid_quirk_list
[i
];
184 if (edid_vendor(edid
, quirk
->vendor
) &&
185 (EDID_PRODUCT_ID(edid
) == quirk
->product_id
))
186 return quirk
->quirks
;
192 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
193 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
197 * edid_fixup_preferred - set preferred modes based on quirk list
198 * @connector: has mode list to fix up
199 * @quirks: quirks list
201 * Walk the mode list for @connector, clearing the preferred status
202 * on existing modes and setting it anew for the right mode ala @quirks.
204 static void edid_fixup_preferred(struct drm_connector
*connector
,
207 struct drm_display_mode
*t
, *cur_mode
, *preferred_mode
;
208 int target_refresh
= 0;
210 if (list_empty(&connector
->probed_modes
))
213 if (quirks
& EDID_QUIRK_PREFER_LARGE_60
)
215 if (quirks
& EDID_QUIRK_PREFER_LARGE_75
)
218 preferred_mode
= list_first_entry(&connector
->probed_modes
,
219 struct drm_display_mode
, head
);
221 list_for_each_entry_safe(cur_mode
, t
, &connector
->probed_modes
, head
) {
222 cur_mode
->type
&= ~DRM_MODE_TYPE_PREFERRED
;
224 if (cur_mode
== preferred_mode
)
227 /* Largest mode is preferred */
228 if (MODE_SIZE(cur_mode
) > MODE_SIZE(preferred_mode
))
229 preferred_mode
= cur_mode
;
231 /* At a given size, try to get closest to target refresh */
232 if ((MODE_SIZE(cur_mode
) == MODE_SIZE(preferred_mode
)) &&
233 MODE_REFRESH_DIFF(cur_mode
, target_refresh
) <
234 MODE_REFRESH_DIFF(preferred_mode
, target_refresh
)) {
235 preferred_mode
= cur_mode
;
239 preferred_mode
->type
|= DRM_MODE_TYPE_PREFERRED
;
243 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
244 * @t: standard timing params
246 * Take the standard timing params (in this case width, aspect, and refresh)
247 * and convert them into a real mode using CVT.
249 * Punts for now, but should eventually use the FB layer's CVT based mode
252 struct drm_display_mode
*drm_mode_std(struct drm_device
*dev
,
253 struct std_timing
*t
)
255 struct drm_display_mode
*mode
;
256 int hsize
= t
->hsize
* 8 + 248, vsize
;
258 mode
= drm_mode_create(dev
);
262 if (t
->aspect_ratio
== 0)
263 vsize
= (hsize
* 10) / 16;
264 else if (t
->aspect_ratio
== 1)
265 vsize
= (hsize
* 3) / 4;
266 else if (t
->aspect_ratio
== 2)
267 vsize
= (hsize
* 4) / 5;
269 vsize
= (hsize
* 9) / 16;
271 drm_mode_set_name(mode
);
277 * drm_mode_detailed - create a new mode from an EDID detailed timing section
278 * @dev: DRM device (needed to create new mode)
280 * @timing: EDID detailed timing info
281 * @quirks: quirks to apply
283 * An EDID detailed timing block contains enough info for us to create and
284 * return a new struct drm_display_mode.
286 static struct drm_display_mode
*drm_mode_detailed(struct drm_device
*dev
,
288 struct detailed_timing
*timing
,
291 struct drm_display_mode
*mode
;
292 struct detailed_pixel_timing
*pt
= &timing
->data
.pixel_data
;
295 printk(KERN_WARNING
"stereo mode not supported\n");
298 if (!pt
->separate_sync
) {
299 printk(KERN_WARNING
"integrated sync not supported\n");
303 mode
= drm_mode_create(dev
);
307 mode
->type
= DRM_MODE_TYPE_DRIVER
;
309 if (quirks
& EDID_QUIRK_135_CLOCK_TOO_HIGH
)
310 timing
->pixel_clock
= 1088;
312 mode
->clock
= timing
->pixel_clock
* 10;
314 mode
->hdisplay
= (pt
->hactive_hi
<< 8) | pt
->hactive_lo
;
315 mode
->hsync_start
= mode
->hdisplay
+ ((pt
->hsync_offset_hi
<< 8) |
316 pt
->hsync_offset_lo
);
317 mode
->hsync_end
= mode
->hsync_start
+
318 ((pt
->hsync_pulse_width_hi
<< 8) |
319 pt
->hsync_pulse_width_lo
);
320 mode
->htotal
= mode
->hdisplay
+ ((pt
->hblank_hi
<< 8) | pt
->hblank_lo
);
322 mode
->vdisplay
= (pt
->vactive_hi
<< 8) | pt
->vactive_lo
;
323 mode
->vsync_start
= mode
->vdisplay
+ ((pt
->vsync_offset_hi
<< 4) |
324 pt
->vsync_offset_lo
);
325 mode
->vsync_end
= mode
->vsync_start
+
326 ((pt
->vsync_pulse_width_hi
<< 4) |
327 pt
->vsync_pulse_width_lo
);
328 mode
->vtotal
= mode
->vdisplay
+ ((pt
->vblank_hi
<< 8) | pt
->vblank_lo
);
330 drm_mode_set_name(mode
);
333 mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
335 if (quirks
& EDID_QUIRK_DETAILED_SYNC_PP
) {
336 pt
->hsync_positive
= 1;
337 pt
->vsync_positive
= 1;
340 mode
->flags
|= pt
->hsync_positive
? DRM_MODE_FLAG_PHSYNC
: DRM_MODE_FLAG_NHSYNC
;
341 mode
->flags
|= pt
->vsync_positive
? DRM_MODE_FLAG_PVSYNC
: DRM_MODE_FLAG_NVSYNC
;
343 mode
->width_mm
= pt
->width_mm_lo
| (pt
->width_mm_hi
<< 8);
344 mode
->height_mm
= pt
->height_mm_lo
| (pt
->height_mm_hi
<< 8);
346 if (quirks
& EDID_QUIRK_DETAILED_IN_CM
) {
347 mode
->width_mm
*= 10;
348 mode
->height_mm
*= 10;
351 if (quirks
& EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE
) {
352 mode
->width_mm
= edid
->width_cm
* 10;
353 mode
->height_mm
= edid
->height_cm
* 10;
360 * Detailed mode info for the EDID "established modes" data to use.
362 static struct drm_display_mode edid_est_modes
[] = {
363 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER
, 40000, 800, 840,
364 968, 1056, 0, 600, 601, 605, 628, 0,
365 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 800x600@60Hz */
366 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER
, 36000, 800, 824,
367 896, 1024, 0, 600, 601, 603, 625, 0,
368 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 800x600@56Hz */
369 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER
, 31500, 640, 656,
370 720, 840, 0, 480, 481, 484, 500, 0,
371 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 640x480@75Hz */
372 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER
, 31500, 640, 664,
373 704, 832, 0, 480, 489, 491, 520, 0,
374 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 640x480@72Hz */
375 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER
, 30240, 640, 704,
376 768, 864, 0, 480, 483, 486, 525, 0,
377 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 640x480@67Hz */
378 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER
, 25200, 640, 656,
379 752, 800, 0, 480, 490, 492, 525, 0,
380 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 640x480@60Hz */
381 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER
, 35500, 720, 738,
382 846, 900, 0, 400, 421, 423, 449, 0,
383 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 720x400@88Hz */
384 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER
, 28320, 720, 738,
385 846, 900, 0, 400, 412, 414, 449, 0,
386 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 720x400@70Hz */
387 { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER
, 135000, 1280, 1296,
388 1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
389 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 1280x1024@75Hz */
390 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER
, 78800, 1024, 1040,
391 1136, 1312, 0, 768, 769, 772, 800, 0,
392 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 1024x768@75Hz */
393 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER
, 75000, 1024, 1048,
394 1184, 1328, 0, 768, 771, 777, 806, 0,
395 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 1024x768@70Hz */
396 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER
, 65000, 1024, 1048,
397 1184, 1344, 0, 768, 771, 777, 806, 0,
398 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 1024x768@60Hz */
399 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER
,44900, 1024, 1032,
400 1208, 1264, 0, 768, 768, 776, 817, 0,
401 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
| DRM_MODE_FLAG_INTERLACE
) }, /* 1024x768@43Hz */
402 { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER
, 57284, 832, 864,
403 928, 1152, 0, 624, 625, 628, 667, 0,
404 DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_NVSYNC
) }, /* 832x624@75Hz */
405 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER
, 49500, 800, 816,
406 896, 1056, 0, 600, 601, 604, 625, 0,
407 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 800x600@75Hz */
408 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER
, 50000, 800, 856,
409 976, 1040, 0, 600, 637, 643, 666, 0,
410 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 800x600@72Hz */
411 { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER
, 108000, 1152, 1216,
412 1344, 1600, 0, 864, 865, 868, 900, 0,
413 DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_PVSYNC
) }, /* 1152x864@75Hz */
416 #define EDID_EST_TIMINGS 16
417 #define EDID_STD_TIMINGS 8
418 #define EDID_DETAILED_TIMINGS 4
421 * add_established_modes - get est. modes from EDID and add them
422 * @edid: EDID block to scan
424 * Each EDID block contains a bitmap of the supported "established modes" list
425 * (defined above). Tease them out and add them to the global modes list.
427 static int add_established_modes(struct drm_connector
*connector
, struct edid
*edid
)
429 struct drm_device
*dev
= connector
->dev
;
430 unsigned long est_bits
= edid
->established_timings
.t1
|
431 (edid
->established_timings
.t2
<< 8) |
432 ((edid
->established_timings
.mfg_rsvd
& 0x80) << 9);
435 for (i
= 0; i
<= EDID_EST_TIMINGS
; i
++)
436 if (est_bits
& (1<<i
)) {
437 struct drm_display_mode
*newmode
;
438 newmode
= drm_mode_duplicate(dev
, &edid_est_modes
[i
]);
440 drm_mode_probed_add(connector
, newmode
);
449 * add_standard_modes - get std. modes from EDID and add them
450 * @edid: EDID block to scan
452 * Standard modes can be calculated using the CVT standard. Grab them from
453 * @edid, calculate them, and add them to the list.
455 static int add_standard_modes(struct drm_connector
*connector
, struct edid
*edid
)
457 struct drm_device
*dev
= connector
->dev
;
460 for (i
= 0; i
< EDID_STD_TIMINGS
; i
++) {
461 struct std_timing
*t
= &edid
->standard_timings
[i
];
462 struct drm_display_mode
*newmode
;
464 /* If std timings bytes are 1, 1 it's empty */
465 if (t
->hsize
== 1 && (t
->aspect_ratio
| t
->vfreq
) == 1)
468 newmode
= drm_mode_std(dev
, &edid
->standard_timings
[i
]);
470 drm_mode_probed_add(connector
, newmode
);
479 * add_detailed_modes - get detailed mode info from EDID data
480 * @connector: attached connector
481 * @edid: EDID block to scan
482 * @quirks: quirks to apply
484 * Some of the detailed timing sections may contain mode information. Grab
485 * it and add it to the list.
487 static int add_detailed_info(struct drm_connector
*connector
,
488 struct edid
*edid
, u32 quirks
)
490 struct drm_device
*dev
= connector
->dev
;
493 for (i
= 0; i
< EDID_DETAILED_TIMINGS
; i
++) {
494 struct detailed_timing
*timing
= &edid
->detailed_timings
[i
];
495 struct detailed_non_pixel
*data
= &timing
->data
.other_data
;
496 struct drm_display_mode
*newmode
;
498 /* EDID up to and including 1.2 may put monitor info here */
499 if (edid
->version
== 1 && edid
->revision
< 3)
502 /* Detailed mode timing */
503 if (timing
->pixel_clock
) {
504 newmode
= drm_mode_detailed(dev
, edid
, timing
, quirks
);
508 /* First detailed mode is preferred */
509 if (i
== 0 && edid
->preferred_timing
)
510 newmode
->type
|= DRM_MODE_TYPE_PREFERRED
;
511 drm_mode_probed_add(connector
, newmode
);
517 /* Other timing or info */
518 switch (data
->type
) {
519 case EDID_DETAIL_MONITOR_SERIAL
:
521 case EDID_DETAIL_MONITOR_STRING
:
523 case EDID_DETAIL_MONITOR_RANGE
:
524 /* Get monitor range data */
526 case EDID_DETAIL_MONITOR_NAME
:
528 case EDID_DETAIL_MONITOR_CPDATA
:
530 case EDID_DETAIL_STD_MODES
:
531 /* Five modes per detailed section */
532 for (j
= 0; j
< 5; i
++) {
533 struct std_timing
*std
;
534 struct drm_display_mode
*newmode
;
536 std
= &data
->data
.timings
[j
];
537 newmode
= drm_mode_std(dev
, std
);
539 drm_mode_probed_add(connector
, newmode
);
552 #define DDC_ADDR 0x50
554 * Get EDID information via I2C.
556 * \param adapter : i2c device adaptor
557 * \param buf : EDID data buffer to be filled
558 * \param len : EDID data buffer length
559 * \return 0 on success or -1 on failure.
561 * Try to fetch EDID information by calling i2c driver function.
563 int drm_do_probe_ddc_edid(struct i2c_adapter
*adapter
,
564 unsigned char *buf
, int len
)
566 unsigned char start
= 0x0;
567 struct i2c_msg msgs
[] = {
581 if (i2c_transfer(adapter
, msgs
, 2) == 2)
584 dev_info(&adapter
->dev
, "unable to read EDID block.\n");
587 EXPORT_SYMBOL(drm_do_probe_ddc_edid
);
590 * Get EDID information.
592 * \param adapter : i2c device adaptor.
593 * \param buf : EDID data buffer to be filled
594 * \param len : EDID data buffer length
595 * \return 0 on success or -1 on failure.
597 * Initialize DDC, then fetch EDID information
598 * by calling drm_do_probe_ddc_edid function.
600 static int drm_ddc_read(struct i2c_adapter
*adapter
,
601 unsigned char *buf
, int len
)
603 struct i2c_algo_bit_data
*algo_data
= adapter
->algo_data
;
607 algo_data
->setscl(algo_data
->data
, 1);
609 for (i
= 0; i
< 1; i
++) {
610 /* For some old monitors we need the
611 * following process to initialize/stop DDC
613 algo_data
->setsda(algo_data
->data
, 1);
616 algo_data
->setscl(algo_data
->data
, 1);
617 for (j
= 0; j
< 5; j
++) {
619 if (algo_data
->getscl(algo_data
->data
))
625 algo_data
->setsda(algo_data
->data
, 0);
627 algo_data
->setscl(algo_data
->data
, 0);
629 algo_data
->setsda(algo_data
->data
, 1);
632 /* Do the real work */
633 ret
= drm_do_probe_ddc_edid(adapter
, buf
, len
);
634 algo_data
->setsda(algo_data
->data
, 0);
635 algo_data
->setscl(algo_data
->data
, 0);
638 algo_data
->setscl(algo_data
->data
, 1);
639 for (j
= 0; j
< 10; j
++) {
641 if (algo_data
->getscl(algo_data
->data
))
645 algo_data
->setsda(algo_data
->data
, 1);
647 algo_data
->setscl(algo_data
->data
, 0);
648 algo_data
->setsda(algo_data
->data
, 0);
652 /* Release the DDC lines when done or the Apple Cinema HD display
655 algo_data
->setsda(algo_data
->data
, 1);
656 algo_data
->setscl(algo_data
->data
, 1);
661 static int drm_ddc_read_edid(struct drm_connector
*connector
,
662 struct i2c_adapter
*adapter
,
667 ret
= drm_ddc_read(adapter
, buf
, len
);
669 dev_info(&connector
->dev
->pdev
->dev
, "%s: no EDID data\n",
670 drm_get_connector_name(connector
));
673 if (!edid_is_valid((struct edid
*)buf
)) {
674 dev_warn(&connector
->dev
->pdev
->dev
, "%s: EDID invalid.\n",
675 drm_get_connector_name(connector
));
682 #define MAX_EDID_EXT_NUM 4
684 * drm_get_edid - get EDID data, if available
685 * @connector: connector we're probing
686 * @adapter: i2c adapter to use for DDC
688 * Poke the given connector's i2c channel to grab EDID data if possible.
690 * Return edid data or NULL if we couldn't find any.
692 struct edid
*drm_get_edid(struct drm_connector
*connector
,
693 struct i2c_adapter
*adapter
)
698 edid
= kmalloc(EDID_LENGTH
* (MAX_EDID_EXT_NUM
+ 1),
701 dev_warn(&connector
->dev
->pdev
->dev
,
702 "Failed to allocate EDID\n");
706 /* Read first EDID block */
707 ret
= drm_ddc_read_edid(connector
, adapter
,
708 (unsigned char *)edid
, EDID_LENGTH
);
712 /* There are EDID extensions to be read */
713 if (edid
->extensions
!= 0) {
714 int edid_ext_num
= edid
->extensions
;
716 if (edid_ext_num
> MAX_EDID_EXT_NUM
) {
717 dev_warn(&connector
->dev
->pdev
->dev
,
718 "The number of extension(%d) is "
719 "over max (%d), actually read number (%d)\n",
720 edid_ext_num
, MAX_EDID_EXT_NUM
,
722 /* Reset EDID extension number to be read */
723 edid_ext_num
= MAX_EDID_EXT_NUM
;
725 /* Read EDID including extensions too */
726 ret
= drm_ddc_read_edid(connector
, adapter
, (char *)edid
,
727 EDID_LENGTH
* (edid_ext_num
+ 1));
733 connector
->display_info
.raw_edid
= (char *)edid
;
743 EXPORT_SYMBOL(drm_get_edid
);
745 #define HDMI_IDENTIFIER 0x000C03
746 #define VENDOR_BLOCK 0x03
748 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
749 * @edid: monitor EDID information
751 * Parse the CEA extension according to CEA-861-B.
752 * Return true if HDMI, false if not or unknown.
754 bool drm_detect_hdmi_monitor(struct edid
*edid
)
756 char *edid_ext
= NULL
;
757 int i
, hdmi_id
, edid_ext_num
;
758 int start_offset
, end_offset
;
759 bool is_hdmi
= false;
761 /* No EDID or EDID extensions */
762 if (edid
== NULL
|| edid
->extensions
== 0)
765 /* Chose real EDID extension number */
766 edid_ext_num
= edid
->extensions
> MAX_EDID_EXT_NUM
?
767 MAX_EDID_EXT_NUM
: edid
->extensions
;
769 /* Find CEA extension */
770 for (i
= 0; i
< edid_ext_num
; i
++) {
771 edid_ext
= (char *)edid
+ EDID_LENGTH
* (i
+ 1);
772 /* This block is CEA extension */
773 if (edid_ext
[0] == 0x02)
777 if (i
== edid_ext_num
)
780 /* Data block offset in CEA extension block */
782 end_offset
= edid_ext
[2];
785 * Because HDMI identifier is in Vendor Specific Block,
786 * search it from all data blocks of CEA extension.
788 for (i
= start_offset
; i
< end_offset
;
789 /* Increased by data block len */
790 i
+= ((edid_ext
[i
] & 0x1f) + 1)) {
791 /* Find vendor specific block */
792 if ((edid_ext
[i
] >> 5) == VENDOR_BLOCK
) {
793 hdmi_id
= edid_ext
[i
+ 1] | (edid_ext
[i
+ 2] << 8) |
794 edid_ext
[i
+ 3] << 16;
795 /* Find HDMI identifier */
796 if (hdmi_id
== HDMI_IDENTIFIER
)
805 EXPORT_SYMBOL(drm_detect_hdmi_monitor
);
808 * drm_add_edid_modes - add modes from EDID data, if available
809 * @connector: connector we're probing
812 * Add the specified modes to the connector's mode list.
814 * Return number of modes added or 0 if we couldn't find any.
816 int drm_add_edid_modes(struct drm_connector
*connector
, struct edid
*edid
)
824 if (!edid_is_valid(edid
)) {
825 dev_warn(&connector
->dev
->pdev
->dev
, "%s: EDID invalid.\n",
826 drm_get_connector_name(connector
));
830 quirks
= edid_get_quirks(edid
);
832 num_modes
+= add_established_modes(connector
, edid
);
833 num_modes
+= add_standard_modes(connector
, edid
);
834 num_modes
+= add_detailed_info(connector
, edid
, quirks
);
836 if (quirks
& (EDID_QUIRK_PREFER_LARGE_60
| EDID_QUIRK_PREFER_LARGE_75
))
837 edid_fixup_preferred(connector
, quirks
);
839 connector
->display_info
.serration_vsync
= edid
->serration_vsync
;
840 connector
->display_info
.sync_on_green
= edid
->sync_on_green
;
841 connector
->display_info
.composite_sync
= edid
->composite_sync
;
842 connector
->display_info
.separate_syncs
= edid
->separate_syncs
;
843 connector
->display_info
.blank_to_black
= edid
->blank_to_black
;
844 connector
->display_info
.video_level
= edid
->video_level
;
845 connector
->display_info
.digital
= edid
->digital
;
846 connector
->display_info
.width_mm
= edid
->width_cm
* 10;
847 connector
->display_info
.height_mm
= edid
->height_cm
* 10;
848 connector
->display_info
.gamma
= edid
->gamma
;
849 connector
->display_info
.gtf_supported
= edid
->default_gtf
;
850 connector
->display_info
.standard_color
= edid
->standard_color
;
851 connector
->display_info
.display_type
= edid
->display_type
;
852 connector
->display_info
.active_off_supported
= edid
->pm_active_off
;
853 connector
->display_info
.suspend_supported
= edid
->pm_suspend
;
854 connector
->display_info
.standby_supported
= edid
->pm_standby
;
855 connector
->display_info
.gamma
= edid
->gamma
;
859 EXPORT_SYMBOL(drm_add_edid_modes
);