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path: root/drivers/gpu/drm/drm_edid.c
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Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r--drivers/gpu/drm/drm_edid.c732
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diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
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1/*
2 * Copyright (c) 2006 Luc Verhaegen (quirks list)
3 * Copyright (c) 2007-2008 Intel Corporation
4 * Jesse Barnes <jesse.barnes@intel.com>
5 *
6 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
7 * FB layer.
8 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
9 *
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:
16 *
17 * The above copyright notice and this permission notice (including the
18 * next paragraph) shall be included in all copies or substantial portions
19 * of the Software.
20 *
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.
28 */
29#include <linux/kernel.h>
30#include <linux/i2c.h>
31#include <linux/i2c-algo-bit.h>
32#include "drmP.h"
33#include "drm_edid.h"
34
35/*
36 * TODO:
37 * - support EDID 1.4 (incl. CE blocks)
38 */
39
40/*
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).
45 */
46
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.
57 */
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)
63
64static struct edid_quirk {
65 char *vendor;
66 int product_id;
67 u32 quirks;
68} edid_quirk_list[] = {
69 /* Acer AL1706 */
70 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
71 /* Acer F51 */
72 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
73 /* Unknown Acer */
74 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
75
76 /* Belinea 10 15 55 */
77 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
78 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
79
80 /* Envision Peripherals, Inc. EN-7100e */
81 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
82
83 /* Funai Electronics PM36B */
84 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
85 EDID_QUIRK_DETAILED_IN_CM },
86
87 /* LG Philips LCD LP154W01-A5 */
88 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
89 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
90
91 /* Philips 107p5 CRT */
92 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
93
94 /* Proview AY765C */
95 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
96
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 },
102};
103
104
105/* Valid EDID header has these bytes */
106static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
107
108/**
109 * edid_is_valid - sanity check EDID data
110 * @edid: EDID data
111 *
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
114 * valid.
115 */
116static bool edid_is_valid(struct edid *edid)
117{
118 int i;
119 u8 csum = 0;
120 u8 *raw_edid = (u8 *)edid;
121
122 if (memcmp(edid->header, edid_header, sizeof(edid_header)))
123 goto bad;
124 if (edid->version != 1) {
125 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
126 goto bad;
127 }
128 if (edid->revision <= 0 || edid->revision > 3) {
129 DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid->revision);
130 goto bad;
131 }
132
133 for (i = 0; i < EDID_LENGTH; i++)
134 csum += raw_edid[i];
135 if (csum) {
136 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
137 goto bad;
138 }
139
140 return 1;
141
142bad:
143 if (raw_edid) {
144 DRM_ERROR("Raw EDID:\n");
145 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
146 printk("\n");
147 }
148 return 0;
149}
150
151/**
152 * edid_vendor - match a string against EDID's obfuscated vendor field
153 * @edid: EDID to match
154 * @vendor: vendor string
155 *
156 * Returns true if @vendor is in @edid, false otherwise
157 */
158static bool edid_vendor(struct edid *edid, char *vendor)
159{
160 char edid_vendor[3];
161
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) + '@';
166
167 return !strncmp(edid_vendor, vendor, 3);
168}
169
170/**
171 * edid_get_quirks - return quirk flags for a given EDID
172 * @edid: EDID to process
173 *
174 * This tells subsequent routines what fixes they need to apply.
175 */
176static u32 edid_get_quirks(struct edid *edid)
177{
178 struct edid_quirk *quirk;
179 int i;
180
181 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
182 quirk = &edid_quirk_list[i];
183
184 if (edid_vendor(edid, quirk->vendor) &&
185 (EDID_PRODUCT_ID(edid) == quirk->product_id))
186 return quirk->quirks;
187 }
188
189 return 0;
190}
191
192#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
193#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
194
195
196/**
197 * edid_fixup_preferred - set preferred modes based on quirk list
198 * @connector: has mode list to fix up
199 * @quirks: quirks list
200 *
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.
203 */
204static void edid_fixup_preferred(struct drm_connector *connector,
205 u32 quirks)
206{
207 struct drm_display_mode *t, *cur_mode, *preferred_mode;
208 int target_refresh;
209
210 if (list_empty(&connector->probed_modes))
211 return;
212
213 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
214 target_refresh = 60;
215 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
216 target_refresh = 75;
217
218 preferred_mode = list_first_entry(&connector->probed_modes,
219 struct drm_display_mode, head);
220
221 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
222 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
223
224 if (cur_mode == preferred_mode)
225 continue;
226
227 /* Largest mode is preferred */
228 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
229 preferred_mode = cur_mode;
230
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;
236 }
237 }
238
239 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
240}
241
242/**
243 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
244 * @t: standard timing params
245 *
246 * Take the standard timing params (in this case width, aspect, and refresh)
247 * and convert them into a real mode using CVT.
248 *
249 * Punts for now, but should eventually use the FB layer's CVT based mode
250 * generation code.
251 */
252struct drm_display_mode *drm_mode_std(struct drm_device *dev,
253 struct std_timing *t)
254{
255 struct drm_display_mode *mode;
256 int hsize = t->hsize * 8 + 248, vsize;
257
258 mode = drm_mode_create(dev);
259 if (!mode)
260 return NULL;
261
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;
268 else
269 vsize = (hsize * 9) / 16;
270
271 drm_mode_set_name(mode);
272
273 return mode;
274}
275
276/**
277 * drm_mode_detailed - create a new mode from an EDID detailed timing section
278 * @dev: DRM device (needed to create new mode)
279 * @edid: EDID block
280 * @timing: EDID detailed timing info
281 * @quirks: quirks to apply
282 *
283 * An EDID detailed timing block contains enough info for us to create and
284 * return a new struct drm_display_mode.
285 */
286static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
287 struct edid *edid,
288 struct detailed_timing *timing,
289 u32 quirks)
290{
291 struct drm_display_mode *mode;
292 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
293
294 if (pt->stereo) {
295 printk(KERN_WARNING "stereo mode not supported\n");
296 return NULL;
297 }
298 if (!pt->separate_sync) {
299 printk(KERN_WARNING "integrated sync not supported\n");
300 return NULL;
301 }
302
303 mode = drm_mode_create(dev);
304 if (!mode)
305 return NULL;
306
307 mode->type = DRM_MODE_TYPE_DRIVER;
308
309 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
310 timing->pixel_clock = 1088;
311
312 mode->clock = timing->pixel_clock * 10;
313
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);
321
322 mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo;
323 mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 8) |
324 pt->vsync_offset_lo);
325 mode->vsync_end = mode->vsync_start +
326 ((pt->vsync_pulse_width_hi << 8) |
327 pt->vsync_pulse_width_lo);
328 mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo);
329
330 drm_mode_set_name(mode);
331
332 if (pt->interlaced)
333 mode->flags |= DRM_MODE_FLAG_INTERLACE;
334
335 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
336 pt->hsync_positive = 1;
337 pt->vsync_positive = 1;
338 }
339
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;
342
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);
345
346 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
347 mode->width_mm *= 10;
348 mode->height_mm *= 10;
349 }
350
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;
354 }
355
356 return mode;
357}
358
359/*
360 * Detailed mode info for the EDID "established modes" data to use.
361 */
362static 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 */
414};
415
416#define EDID_EST_TIMINGS 16
417#define EDID_STD_TIMINGS 8
418#define EDID_DETAILED_TIMINGS 4
419
420/**
421 * add_established_modes - get est. modes from EDID and add them
422 * @edid: EDID block to scan
423 *
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.
426 */
427static int add_established_modes(struct drm_connector *connector, struct edid *edid)
428{
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);
433 int i, modes = 0;
434
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]);
439 if (newmode) {
440 drm_mode_probed_add(connector, newmode);
441 modes++;
442 }
443 }
444
445 return modes;
446}
447
448/**
449 * add_standard_modes - get std. modes from EDID and add them
450 * @edid: EDID block to scan
451 *
452 * Standard modes can be calculated using the CVT standard. Grab them from
453 * @edid, calculate them, and add them to the list.
454 */
455static int add_standard_modes(struct drm_connector *connector, struct edid *edid)
456{
457 struct drm_device *dev = connector->dev;
458 int i, modes = 0;
459
460 for (i = 0; i < EDID_STD_TIMINGS; i++) {
461 struct std_timing *t = &edid->standard_timings[i];
462 struct drm_display_mode *newmode;
463
464 /* If std timings bytes are 1, 1 it's empty */
465 if (t->hsize == 1 && (t->aspect_ratio | t->vfreq) == 1)
466 continue;
467
468 newmode = drm_mode_std(dev, &edid->standard_timings[i]);
469 if (newmode) {
470 drm_mode_probed_add(connector, newmode);
471 modes++;
472 }
473 }
474
475 return modes;
476}
477
478/**
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
483 *
484 * Some of the detailed timing sections may contain mode information. Grab
485 * it and add it to the list.
486 */
487static int add_detailed_info(struct drm_connector *connector,
488 struct edid *edid, u32 quirks)
489{
490 struct drm_device *dev = connector->dev;
491 int i, j, modes = 0;
492
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;
497
498 /* EDID up to and including 1.2 may put monitor info here */
499 if (edid->version == 1 && edid->revision < 3)
500 continue;
501
502 /* Detailed mode timing */
503 if (timing->pixel_clock) {
504 newmode = drm_mode_detailed(dev, edid, timing, quirks);
505 if (!newmode)
506 continue;
507
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);
512
513 modes++;
514 continue;
515 }
516
517 /* Other timing or info */
518 switch (data->type) {
519 case EDID_DETAIL_MONITOR_SERIAL:
520 break;
521 case EDID_DETAIL_MONITOR_STRING:
522 break;
523 case EDID_DETAIL_MONITOR_RANGE:
524 /* Get monitor range data */
525 break;
526 case EDID_DETAIL_MONITOR_NAME:
527 break;
528 case EDID_DETAIL_MONITOR_CPDATA:
529 break;
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;
535
536 std = &data->data.timings[j];
537 newmode = drm_mode_std(dev, std);
538 if (newmode) {
539 drm_mode_probed_add(connector, newmode);
540 modes++;
541 }
542 }
543 break;
544 default:
545 break;
546 }
547 }
548
549 return modes;
550}
551
552#define DDC_ADDR 0x50
553
554unsigned char *drm_do_probe_ddc_edid(struct i2c_adapter *adapter)
555{
556 unsigned char start = 0x0;
557 unsigned char *buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
558 struct i2c_msg msgs[] = {
559 {
560 .addr = DDC_ADDR,
561 .flags = 0,
562 .len = 1,
563 .buf = &start,
564 }, {
565 .addr = DDC_ADDR,
566 .flags = I2C_M_RD,
567 .len = EDID_LENGTH,
568 .buf = buf,
569 }
570 };
571
572 if (!buf) {
573 dev_warn(&adapter->dev, "unable to allocate memory for EDID "
574 "block.\n");
575 return NULL;
576 }
577
578 if (i2c_transfer(adapter, msgs, 2) == 2)
579 return buf;
580
581 dev_info(&adapter->dev, "unable to read EDID block.\n");
582 kfree(buf);
583 return NULL;
584}
585EXPORT_SYMBOL(drm_do_probe_ddc_edid);
586
587static unsigned char *drm_ddc_read(struct i2c_adapter *adapter)
588{
589 struct i2c_algo_bit_data *algo_data = adapter->algo_data;
590 unsigned char *edid = NULL;
591 int i, j;
592
593 algo_data->setscl(algo_data->data, 1);
594
595 for (i = 0; i < 1; i++) {
596 /* For some old monitors we need the
597 * following process to initialize/stop DDC
598 */
599 algo_data->setsda(algo_data->data, 1);
600 msleep(13);
601
602 algo_data->setscl(algo_data->data, 1);
603 for (j = 0; j < 5; j++) {
604 msleep(10);
605 if (algo_data->getscl(algo_data->data))
606 break;
607 }
608 if (j == 5)
609 continue;
610
611 algo_data->setsda(algo_data->data, 0);
612 msleep(15);
613 algo_data->setscl(algo_data->data, 0);
614 msleep(15);
615 algo_data->setsda(algo_data->data, 1);
616 msleep(15);
617
618 /* Do the real work */
619 edid = drm_do_probe_ddc_edid(adapter);
620 algo_data->setsda(algo_data->data, 0);
621 algo_data->setscl(algo_data->data, 0);
622 msleep(15);
623
624 algo_data->setscl(algo_data->data, 1);
625 for (j = 0; j < 10; j++) {
626 msleep(10);
627 if (algo_data->getscl(algo_data->data))
628 break;
629 }
630
631 algo_data->setsda(algo_data->data, 1);
632 msleep(15);
633 algo_data->setscl(algo_data->data, 0);
634 algo_data->setsda(algo_data->data, 0);
635 if (edid)
636 break;
637 }
638 /* Release the DDC lines when done or the Apple Cinema HD display
639 * will switch off
640 */
641 algo_data->setsda(algo_data->data, 1);
642 algo_data->setscl(algo_data->data, 1);
643
644 return edid;
645}
646
647/**
648 * drm_get_edid - get EDID data, if available
649 * @connector: connector we're probing
650 * @adapter: i2c adapter to use for DDC
651 *
652 * Poke the given connector's i2c channel to grab EDID data if possible.
653 *
654 * Return edid data or NULL if we couldn't find any.
655 */
656struct edid *drm_get_edid(struct drm_connector *connector,
657 struct i2c_adapter *adapter)
658{
659 struct edid *edid;
660
661 edid = (struct edid *)drm_ddc_read(adapter);
662 if (!edid) {
663 dev_warn(&connector->dev->pdev->dev, "%s: no EDID data\n",
664 drm_get_connector_name(connector));
665 return NULL;
666 }
667 if (!edid_is_valid(edid)) {
668 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
669 drm_get_connector_name(connector));
670 kfree(edid);
671 return NULL;
672 }
673
674 connector->display_info.raw_edid = (char *)edid;
675
676 return edid;
677}
678EXPORT_SYMBOL(drm_get_edid);
679
680/**
681 * drm_add_edid_modes - add modes from EDID data, if available
682 * @connector: connector we're probing
683 * @edid: edid data
684 *
685 * Add the specified modes to the connector's mode list.
686 *
687 * Return number of modes added or 0 if we couldn't find any.
688 */
689int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
690{
691 int num_modes = 0;
692 u32 quirks;
693
694 if (edid == NULL) {
695 return 0;
696 }
697 if (!edid_is_valid(edid)) {
698 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
699 drm_get_connector_name(connector));
700 return 0;
701 }
702
703 quirks = edid_get_quirks(edid);
704
705 num_modes += add_established_modes(connector, edid);
706 num_modes += add_standard_modes(connector, edid);
707 num_modes += add_detailed_info(connector, edid, quirks);
708
709 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
710 edid_fixup_preferred(connector, quirks);
711
712 connector->display_info.serration_vsync = edid->serration_vsync;
713 connector->display_info.sync_on_green = edid->sync_on_green;
714 connector->display_info.composite_sync = edid->composite_sync;
715 connector->display_info.separate_syncs = edid->separate_syncs;
716 connector->display_info.blank_to_black = edid->blank_to_black;
717 connector->display_info.video_level = edid->video_level;
718 connector->display_info.digital = edid->digital;
719 connector->display_info.width_mm = edid->width_cm * 10;
720 connector->display_info.height_mm = edid->height_cm * 10;
721 connector->display_info.gamma = edid->gamma;
722 connector->display_info.gtf_supported = edid->default_gtf;
723 connector->display_info.standard_color = edid->standard_color;
724 connector->display_info.display_type = edid->display_type;
725 connector->display_info.active_off_supported = edid->pm_active_off;
726 connector->display_info.suspend_supported = edid->pm_suspend;
727 connector->display_info.standby_supported = edid->pm_standby;
728 connector->display_info.gamma = edid->gamma;
729
730 return num_modes;
731}
732EXPORT_SYMBOL(drm_add_edid_modes);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-24 14:11:16 -0500