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Merge branch 'drm-intel-fixes' of git://people.freedesktop.org/~danvet/drm-intel...
[linux-2.6/libata-dev.git] / drivers / gpu / drm / drm_edid.c
blob5a3770fbd770d63f2338fee03712917f80891146
1 /*
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.
6 *
7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
8 * FB layer.
9 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
10 *
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:
17 *
18 * The above copyright notice and this permission notice (including the
19 * next paragraph) shall be included in all copies or substantial portions
20 * of the Software.
21 *
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.
29 */
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/i2c.h>
33 #include <linux/module.h>
34 #include <drm/drmP.h>
35 #include <drm/drm_edid.h>
36 #include "drm_edid_modes.h"
37
38 #define version_greater(edid, maj, min) \
39 (((edid)->version > (maj)) || \
40 ((edid)->version == (maj) && (edid)->revision > (min)))
41
42 #define EDID_EST_TIMINGS 16
43 #define EDID_STD_TIMINGS 8
44 #define EDID_DETAILED_TIMINGS 4
45
46 /*
47 * EDID blocks out in the wild have a variety of bugs, try to collect
48 * them here (note that userspace may work around broken monitors first,
49 * but fixes should make their way here so that the kernel "just works"
50 * on as many displays as possible).
51 */
52
53 /* First detailed mode wrong, use largest 60Hz mode */
54 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
55 /* Reported 135MHz pixel clock is too high, needs adjustment */
56 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
57 /* Prefer the largest mode at 75 Hz */
58 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
59 /* Detail timing is in cm not mm */
60 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
61 /* Detailed timing descriptors have bogus size values, so just take the
62 * maximum size and use that.
63 */
64 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
65 /* Monitor forgot to set the first detailed is preferred bit. */
66 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
67 /* use +hsync +vsync for detailed mode */
68 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
69 /* Force reduced-blanking timings for detailed modes */
70 #define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7)
71
72 struct detailed_mode_closure {
73 struct drm_connector *connector;
74 struct edid *edid;
75 bool preferred;
76 u32 quirks;
77 int modes;
78 };
79
80 #define LEVEL_DMT 0
81 #define LEVEL_GTF 1
82 #define LEVEL_GTF2 2
83 #define LEVEL_CVT 3
84
85 static struct edid_quirk {
86 char vendor[4];
87 int product_id;
88 u32 quirks;
89 } edid_quirk_list[] = {
90 /* ASUS VW222S */
91 { "ACI", 0x22a2, EDID_QUIRK_FORCE_REDUCED_BLANKING },
92
93 /* Acer AL1706 */
94 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
95 /* Acer F51 */
96 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
97 /* Unknown Acer */
98 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
99
100 /* Belinea 10 15 55 */
101 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
102 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
103
104 /* Envision Peripherals, Inc. EN-7100e */
105 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
106 /* Envision EN2028 */
107 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
108
109 /* Funai Electronics PM36B */
110 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
111 EDID_QUIRK_DETAILED_IN_CM },
112
113 /* LG Philips LCD LP154W01-A5 */
114 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
115 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
116
117 /* Philips 107p5 CRT */
118 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
119
120 /* Proview AY765C */
121 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
122
123 /* Samsung SyncMaster 205BW. Note: irony */
124 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
125 /* Samsung SyncMaster 22[5-6]BW */
126 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
127 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
128
129 /* ViewSonic VA2026w */
130 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
131 };
132
133 /*** DDC fetch and block validation ***/
134
135 static const u8 edid_header[] = {
136 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
137 };
138
139 /*
140 * Sanity check the header of the base EDID block. Return 8 if the header
141 * is perfect, down to 0 if it's totally wrong.
142 */
143 int drm_edid_header_is_valid(const u8 *raw_edid)
144 {
145 int i, score = 0;
146
147 for (i = 0; i < sizeof(edid_header); i++)
148 if (raw_edid[i] == edid_header[i])
149 score++;
150
151 return score;
152 }
153 EXPORT_SYMBOL(drm_edid_header_is_valid);
154
155 static int edid_fixup __read_mostly = 6;
156 module_param_named(edid_fixup, edid_fixup, int, 0400);
157 MODULE_PARM_DESC(edid_fixup,
158 "Minimum number of valid EDID header bytes (0-8, default 6)");
159
160 /*
161 * Sanity check the EDID block (base or extension). Return 0 if the block
162 * doesn't check out, or 1 if it's valid.
163 */
164 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
165 {
166 int i;
167 u8 csum = 0;
168 struct edid *edid = (struct edid *)raw_edid;
169
170 if (edid_fixup > 8 || edid_fixup < 0)
171 edid_fixup = 6;
172
173 if (block == 0) {
174 int score = drm_edid_header_is_valid(raw_edid);
175 if (score == 8) ;
176 else if (score >= edid_fixup) {
177 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
178 memcpy(raw_edid, edid_header, sizeof(edid_header));
179 } else {
180 goto bad;
181 }
182 }
183
184 for (i = 0; i < EDID_LENGTH; i++)
185 csum += raw_edid[i];
186 if (csum) {
187 if (print_bad_edid) {
188 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
189 }
190
191 /* allow CEA to slide through, switches mangle this */
192 if (raw_edid[0] != 0x02)
193 goto bad;
194 }
195
196 /* per-block-type checks */
197 switch (raw_edid[0]) {
198 case 0: /* base */
199 if (edid->version != 1) {
200 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
201 goto bad;
202 }
203
204 if (edid->revision > 4)
205 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
206 break;
207
208 default:
209 break;
210 }
211
212 return 1;
213
214 bad:
215 if (raw_edid && print_bad_edid) {
216 printk(KERN_ERR "Raw EDID:\n");
217 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
218 raw_edid, EDID_LENGTH, false);
219 }
220 return 0;
221 }
222 EXPORT_SYMBOL(drm_edid_block_valid);
223
224 /**
225 * drm_edid_is_valid - sanity check EDID data
226 * @edid: EDID data
227 *
228 * Sanity-check an entire EDID record (including extensions)
229 */
230 bool drm_edid_is_valid(struct edid *edid)
231 {
232 int i;
233 u8 *raw = (u8 *)edid;
234
235 if (!edid)
236 return false;
237
238 for (i = 0; i <= edid->extensions; i++)
239 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true))
240 return false;
241
242 return true;
243 }
244 EXPORT_SYMBOL(drm_edid_is_valid);
245
246 #define DDC_SEGMENT_ADDR 0x30
247 /**
248 * Get EDID information via I2C.
249 *
250 * \param adapter : i2c device adaptor
251 * \param buf : EDID data buffer to be filled
252 * \param len : EDID data buffer length
253 * \return 0 on success or -1 on failure.
254 *
255 * Try to fetch EDID information by calling i2c driver function.
256 */
257 static int
258 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
259 int block, int len)
260 {
261 unsigned char start = block * EDID_LENGTH;
262 unsigned char segment = block >> 1;
263 unsigned char xfers = segment ? 3 : 2;
264 int ret, retries = 5;
265
266 /* The core i2c driver will automatically retry the transfer if the
267 * adapter reports EAGAIN. However, we find that bit-banging transfers
268 * are susceptible to errors under a heavily loaded machine and
269 * generate spurious NAKs and timeouts. Retrying the transfer
270 * of the individual block a few times seems to overcome this.
271 */
272 do {
273 struct i2c_msg msgs[] = {
274 {
275 .addr = DDC_SEGMENT_ADDR,
276 .flags = 0,
277 .len = 1,
278 .buf = &segment,
279 }, {
280 .addr = DDC_ADDR,
281 .flags = 0,
282 .len = 1,
283 .buf = &start,
284 }, {
285 .addr = DDC_ADDR,
286 .flags = I2C_M_RD,
287 .len = len,
288 .buf = buf,
289 }
290 };
291
292 /*
293 * Avoid sending the segment addr to not upset non-compliant ddc
294 * monitors.
295 */
296 ret = i2c_transfer(adapter, &msgs[3 - xfers], xfers);
297
298 if (ret == -ENXIO) {
299 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
300 adapter->name);
301 break;
302 }
303 } while (ret != xfers && --retries);
304
305 return ret == xfers ? 0 : -1;
306 }
307
308 static bool drm_edid_is_zero(u8 *in_edid, int length)
309 {
310 if (memchr_inv(in_edid, 0, length))
311 return false;
312
313 return true;
314 }
315
316 static u8 *
317 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
318 {
319 int i, j = 0, valid_extensions = 0;
320 u8 *block, *new;
321 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
322
323 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
324 return NULL;
325
326 /* base block fetch */
327 for (i = 0; i < 4; i++) {
328 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
329 goto out;
330 if (drm_edid_block_valid(block, 0, print_bad_edid))
331 break;
332 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
333 connector->null_edid_counter++;
334 goto carp;
335 }
336 }
337 if (i == 4)
338 goto carp;
339
340 /* if there's no extensions, we're done */
341 if (block[0x7e] == 0)
342 return block;
343
344 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
345 if (!new)
346 goto out;
347 block = new;
348
349 for (j = 1; j <= block[0x7e]; j++) {
350 for (i = 0; i < 4; i++) {
351 if (drm_do_probe_ddc_edid(adapter,
352 block + (valid_extensions + 1) * EDID_LENGTH,
353 j, EDID_LENGTH))
354 goto out;
355 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) {
356 valid_extensions++;
357 break;
358 }
359 }
360 if (i == 4)
361 dev_warn(connector->dev->dev,
362 "%s: Ignoring invalid EDID block %d.\n",
363 drm_get_connector_name(connector), j);
364 }
365
366 if (valid_extensions != block[0x7e]) {
367 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
368 block[0x7e] = valid_extensions;
369 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
370 if (!new)
371 goto out;
372 block = new;
373 }
374
375 return block;
376
377 carp:
378 if (print_bad_edid) {
379 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
380 drm_get_connector_name(connector), j);
381 }
382 connector->bad_edid_counter++;
383
384 out:
385 kfree(block);
386 return NULL;
387 }
388
389 /**
390 * Probe DDC presence.
391 *
392 * \param adapter : i2c device adaptor
393 * \return 1 on success
394 */
395 bool
396 drm_probe_ddc(struct i2c_adapter *adapter)
397 {
398 unsigned char out;
399
400 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
401 }
402 EXPORT_SYMBOL(drm_probe_ddc);
403
404 /**
405 * drm_get_edid - get EDID data, if available
406 * @connector: connector we're probing
407 * @adapter: i2c adapter to use for DDC
408 *
409 * Poke the given i2c channel to grab EDID data if possible. If found,
410 * attach it to the connector.
411 *
412 * Return edid data or NULL if we couldn't find any.
413 */
414 struct edid *drm_get_edid(struct drm_connector *connector,
415 struct i2c_adapter *adapter)
416 {
417 struct edid *edid = NULL;
418
419 if (drm_probe_ddc(adapter))
420 edid = (struct edid *)drm_do_get_edid(connector, adapter);
421
422 return edid;
423 }
424 EXPORT_SYMBOL(drm_get_edid);
425
426 /*** EDID parsing ***/
427
428 /**
429 * edid_vendor - match a string against EDID's obfuscated vendor field
430 * @edid: EDID to match
431 * @vendor: vendor string
432 *
433 * Returns true if @vendor is in @edid, false otherwise
434 */
435 static bool edid_vendor(struct edid *edid, char *vendor)
436 {
437 char edid_vendor[3];
438
439 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
440 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
441 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
442 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
443
444 return !strncmp(edid_vendor, vendor, 3);
445 }
446
447 /**
448 * edid_get_quirks - return quirk flags for a given EDID
449 * @edid: EDID to process
450 *
451 * This tells subsequent routines what fixes they need to apply.
452 */
453 static u32 edid_get_quirks(struct edid *edid)
454 {
455 struct edid_quirk *quirk;
456 int i;
457
458 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
459 quirk = &edid_quirk_list[i];
460
461 if (edid_vendor(edid, quirk->vendor) &&
462 (EDID_PRODUCT_ID(edid) == quirk->product_id))
463 return quirk->quirks;
464 }
465
466 return 0;
467 }
468
469 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
470 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
471
472 /**
473 * edid_fixup_preferred - set preferred modes based on quirk list
474 * @connector: has mode list to fix up
475 * @quirks: quirks list
476 *
477 * Walk the mode list for @connector, clearing the preferred status
478 * on existing modes and setting it anew for the right mode ala @quirks.
479 */
480 static void edid_fixup_preferred(struct drm_connector *connector,
481 u32 quirks)
482 {
483 struct drm_display_mode *t, *cur_mode, *preferred_mode;
484 int target_refresh = 0;
485
486 if (list_empty(&connector->probed_modes))
487 return;
488
489 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
490 target_refresh = 60;
491 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
492 target_refresh = 75;
493
494 preferred_mode = list_first_entry(&connector->probed_modes,
495 struct drm_display_mode, head);
496
497 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
498 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
499
500 if (cur_mode == preferred_mode)
501 continue;
502
503 /* Largest mode is preferred */
504 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
505 preferred_mode = cur_mode;
506
507 /* At a given size, try to get closest to target refresh */
508 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
509 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
510 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
511 preferred_mode = cur_mode;
512 }
513 }
514
515 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
516 }
517
518 static bool
519 mode_is_rb(const struct drm_display_mode *mode)
520 {
521 return (mode->htotal - mode->hdisplay == 160) &&
522 (mode->hsync_end - mode->hdisplay == 80) &&
523 (mode->hsync_end - mode->hsync_start == 32) &&
524 (mode->vsync_start - mode->vdisplay == 3);
525 }
526
527 /*
528 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
529 * @dev: Device to duplicate against
530 * @hsize: Mode width
531 * @vsize: Mode height
532 * @fresh: Mode refresh rate
533 * @rb: Mode reduced-blanking-ness
534 *
535 * Walk the DMT mode list looking for a match for the given parameters.
536 * Return a newly allocated copy of the mode, or NULL if not found.
537 */
538 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
539 int hsize, int vsize, int fresh,
540 bool rb)
541 {
542 int i;
543
544 for (i = 0; i < drm_num_dmt_modes; i++) {
545 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
546 if (hsize != ptr->hdisplay)
547 continue;
548 if (vsize != ptr->vdisplay)
549 continue;
550 if (fresh != drm_mode_vrefresh(ptr))
551 continue;
552 if (rb != mode_is_rb(ptr))
553 continue;
554
555 return drm_mode_duplicate(dev, ptr);
556 }
557
558 return NULL;
559 }
560 EXPORT_SYMBOL(drm_mode_find_dmt);
561
562 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
563
564 static void
565 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
566 {
567 int i, n = 0;
568 u8 d = ext[0x02];
569 u8 *det_base = ext + d;
570
571 n = (127 - d) / 18;
572 for (i = 0; i < n; i++)
573 cb((struct detailed_timing *)(det_base + 18 * i), closure);
574 }
575
576 static void
577 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
578 {
579 unsigned int i, n = min((int)ext[0x02], 6);
580 u8 *det_base = ext + 5;
581
582 if (ext[0x01] != 1)
583 return; /* unknown version */
584
585 for (i = 0; i < n; i++)
586 cb((struct detailed_timing *)(det_base + 18 * i), closure);
587 }
588
589 static void
590 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
591 {
592 int i;
593 struct edid *edid = (struct edid *)raw_edid;
594
595 if (edid == NULL)
596 return;
597
598 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
599 cb(&(edid->detailed_timings[i]), closure);
600
601 for (i = 1; i <= raw_edid[0x7e]; i++) {
602 u8 *ext = raw_edid + (i * EDID_LENGTH);
603 switch (*ext) {
604 case CEA_EXT:
605 cea_for_each_detailed_block(ext, cb, closure);
606 break;
607 case VTB_EXT:
608 vtb_for_each_detailed_block(ext, cb, closure);
609 break;
610 default:
611 break;
612 }
613 }
614 }
615
616 static void
617 is_rb(struct detailed_timing *t, void *data)
618 {
619 u8 *r = (u8 *)t;
620 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
621 if (r[15] & 0x10)
622 *(bool *)data = true;
623 }
624
625 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
626 static bool
627 drm_monitor_supports_rb(struct edid *edid)
628 {
629 if (edid->revision >= 4) {
630 bool ret = false;
631 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
632 return ret;
633 }
634
635 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
636 }
637
638 static void
639 find_gtf2(struct detailed_timing *t, void *data)
640 {
641 u8 *r = (u8 *)t;
642 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
643 *(u8 **)data = r;
644 }
645
646 /* Secondary GTF curve kicks in above some break frequency */
647 static int
648 drm_gtf2_hbreak(struct edid *edid)
649 {
650 u8 *r = NULL;
651 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
652 return r ? (r[12] * 2) : 0;
653 }
654
655 static int
656 drm_gtf2_2c(struct edid *edid)
657 {
658 u8 *r = NULL;
659 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
660 return r ? r[13] : 0;
661 }
662
663 static int
664 drm_gtf2_m(struct edid *edid)
665 {
666 u8 *r = NULL;
667 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
668 return r ? (r[15] << 8) + r[14] : 0;
669 }
670
671 static int
672 drm_gtf2_k(struct edid *edid)
673 {
674 u8 *r = NULL;
675 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
676 return r ? r[16] : 0;
677 }
678
679 static int
680 drm_gtf2_2j(struct edid *edid)
681 {
682 u8 *r = NULL;
683 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
684 return r ? r[17] : 0;
685 }
686
687 /**
688 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
689 * @edid: EDID block to scan
690 */
691 static int standard_timing_level(struct edid *edid)
692 {
693 if (edid->revision >= 2) {
694 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
695 return LEVEL_CVT;
696 if (drm_gtf2_hbreak(edid))
697 return LEVEL_GTF2;
698 return LEVEL_GTF;
699 }
700 return LEVEL_DMT;
701 }
702
703 /*
704 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
705 * monitors fill with ascii space (0x20) instead.
706 */
707 static int
708 bad_std_timing(u8 a, u8 b)
709 {
710 return (a == 0x00 && b == 0x00) ||
711 (a == 0x01 && b == 0x01) ||
712 (a == 0x20 && b == 0x20);
713 }
714
715 /**
716 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
717 * @t: standard timing params
718 * @timing_level: standard timing level
719 *
720 * Take the standard timing params (in this case width, aspect, and refresh)
721 * and convert them into a real mode using CVT/GTF/DMT.
722 */
723 static struct drm_display_mode *
724 drm_mode_std(struct drm_connector *connector, struct edid *edid,
725 struct std_timing *t, int revision)
726 {
727 struct drm_device *dev = connector->dev;
728 struct drm_display_mode *m, *mode = NULL;
729 int hsize, vsize;
730 int vrefresh_rate;
731 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
732 >> EDID_TIMING_ASPECT_SHIFT;
733 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
734 >> EDID_TIMING_VFREQ_SHIFT;
735 int timing_level = standard_timing_level(edid);
736
737 if (bad_std_timing(t->hsize, t->vfreq_aspect))
738 return NULL;
739
740 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
741 hsize = t->hsize * 8 + 248;
742 /* vrefresh_rate = vfreq + 60 */
743 vrefresh_rate = vfreq + 60;
744 /* the vdisplay is calculated based on the aspect ratio */
745 if (aspect_ratio == 0) {
746 if (revision < 3)
747 vsize = hsize;
748 else
749 vsize = (hsize * 10) / 16;
750 } else if (aspect_ratio == 1)
751 vsize = (hsize * 3) / 4;
752 else if (aspect_ratio == 2)
753 vsize = (hsize * 4) / 5;
754 else
755 vsize = (hsize * 9) / 16;
756
757 /* HDTV hack, part 1 */
758 if (vrefresh_rate == 60 &&
759 ((hsize == 1360 && vsize == 765) ||
760 (hsize == 1368 && vsize == 769))) {
761 hsize = 1366;
762 vsize = 768;
763 }
764
765 /*
766 * If this connector already has a mode for this size and refresh
767 * rate (because it came from detailed or CVT info), use that
768 * instead. This way we don't have to guess at interlace or
769 * reduced blanking.
770 */
771 list_for_each_entry(m, &connector->probed_modes, head)
772 if (m->hdisplay == hsize && m->vdisplay == vsize &&
773 drm_mode_vrefresh(m) == vrefresh_rate)
774 return NULL;
775
776 /* HDTV hack, part 2 */
777 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
778 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
779 false);
780 mode->hdisplay = 1366;
781 mode->hsync_start = mode->hsync_start - 1;
782 mode->hsync_end = mode->hsync_end - 1;
783 return mode;
784 }
785
786 /* check whether it can be found in default mode table */
787 if (drm_monitor_supports_rb(edid)) {
788 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
789 true);
790 if (mode)
791 return mode;
792 }
793 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
794 if (mode)
795 return mode;
796
797 /* okay, generate it */
798 switch (timing_level) {
799 case LEVEL_DMT:
800 break;
801 case LEVEL_GTF:
802 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
803 break;
804 case LEVEL_GTF2:
805 /*
806 * This is potentially wrong if there's ever a monitor with
807 * more than one ranges section, each claiming a different
808 * secondary GTF curve. Please don't do that.
809 */
810 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
811 if (!mode)
812 return NULL;
813 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
814 drm_mode_destroy(dev, mode);
815 mode = drm_gtf_mode_complex(dev, hsize, vsize,
816 vrefresh_rate, 0, 0,
817 drm_gtf2_m(edid),
818 drm_gtf2_2c(edid),
819 drm_gtf2_k(edid),
820 drm_gtf2_2j(edid));
821 }
822 break;
823 case LEVEL_CVT:
824 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
825 false);
826 break;
827 }
828 return mode;
829 }
830
831 /*
832 * EDID is delightfully ambiguous about how interlaced modes are to be
833 * encoded. Our internal representation is of frame height, but some
834 * HDTV detailed timings are encoded as field height.
835 *
836 * The format list here is from CEA, in frame size. Technically we
837 * should be checking refresh rate too. Whatever.
838 */
839 static void
840 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
841 struct detailed_pixel_timing *pt)
842 {
843 int i;
844 static const struct {
845 int w, h;
846 } cea_interlaced[] = {
847 { 1920, 1080 },
848 { 720, 480 },
849 { 1440, 480 },
850 { 2880, 480 },
851 { 720, 576 },
852 { 1440, 576 },
853 { 2880, 576 },
854 };
855
856 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
857 return;
858
859 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
860 if ((mode->hdisplay == cea_interlaced[i].w) &&
861 (mode->vdisplay == cea_interlaced[i].h / 2)) {
862 mode->vdisplay *= 2;
863 mode->vsync_start *= 2;
864 mode->vsync_end *= 2;
865 mode->vtotal *= 2;
866 mode->vtotal |= 1;
867 }
868 }
869
870 mode->flags |= DRM_MODE_FLAG_INTERLACE;
871 }
872
873 /**
874 * drm_mode_detailed - create a new mode from an EDID detailed timing section
875 * @dev: DRM device (needed to create new mode)
876 * @edid: EDID block
877 * @timing: EDID detailed timing info
878 * @quirks: quirks to apply
879 *
880 * An EDID detailed timing block contains enough info for us to create and
881 * return a new struct drm_display_mode.
882 */
883 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
884 struct edid *edid,
885 struct detailed_timing *timing,
886 u32 quirks)
887 {
888 struct drm_display_mode *mode;
889 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
890 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
891 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
892 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
893 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
894 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
895 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
896 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
897 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
898
899 /* ignore tiny modes */
900 if (hactive < 64 || vactive < 64)
901 return NULL;
902
903 if (pt->misc & DRM_EDID_PT_STEREO) {
904 printk(KERN_WARNING "stereo mode not supported\n");
905 return NULL;
906 }
907 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
908 printk(KERN_WARNING "composite sync not supported\n");
909 }
910
911 /* it is incorrect if hsync/vsync width is zero */
912 if (!hsync_pulse_width || !vsync_pulse_width) {
913 DRM_DEBUG_KMS("Incorrect Detailed timing. "
914 "Wrong Hsync/Vsync pulse width\n");
915 return NULL;
916 }
917
918 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
919 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
920 if (!mode)
921 return NULL;
922
923 goto set_size;
924 }
925
926 mode = drm_mode_create(dev);
927 if (!mode)
928 return NULL;
929
930 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
931 timing->pixel_clock = cpu_to_le16(1088);
932
933 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
934
935 mode->hdisplay = hactive;
936 mode->hsync_start = mode->hdisplay + hsync_offset;
937 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
938 mode->htotal = mode->hdisplay + hblank;
939
940 mode->vdisplay = vactive;
941 mode->vsync_start = mode->vdisplay + vsync_offset;
942 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
943 mode->vtotal = mode->vdisplay + vblank;
944
945 /* Some EDIDs have bogus h/vtotal values */
946 if (mode->hsync_end > mode->htotal)
947 mode->htotal = mode->hsync_end + 1;
948 if (mode->vsync_end > mode->vtotal)
949 mode->vtotal = mode->vsync_end + 1;
950
951 drm_mode_do_interlace_quirk(mode, pt);
952
953 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
954 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
955 }
956
957 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
958 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
959 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
960 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
961
962 set_size:
963 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
964 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
965
966 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
967 mode->width_mm *= 10;
968 mode->height_mm *= 10;
969 }
970
971 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
972 mode->width_mm = edid->width_cm * 10;
973 mode->height_mm = edid->height_cm * 10;
974 }
975
976 mode->type = DRM_MODE_TYPE_DRIVER;
977 drm_mode_set_name(mode);
978
979 return mode;
980 }
981
982 static bool
983 mode_in_hsync_range(const struct drm_display_mode *mode,
984 struct edid *edid, u8 *t)
985 {
986 int hsync, hmin, hmax;
987
988 hmin = t[7];
989 if (edid->revision >= 4)
990 hmin += ((t[4] & 0x04) ? 255 : 0);
991 hmax = t[8];
992 if (edid->revision >= 4)
993 hmax += ((t[4] & 0x08) ? 255 : 0);
994 hsync = drm_mode_hsync(mode);
995
996 return (hsync <= hmax && hsync >= hmin);
997 }
998
999 static bool
1000 mode_in_vsync_range(const struct drm_display_mode *mode,
1001 struct edid *edid, u8 *t)
1002 {
1003 int vsync, vmin, vmax;
1004
1005 vmin = t[5];
1006 if (edid->revision >= 4)
1007 vmin += ((t[4] & 0x01) ? 255 : 0);
1008 vmax = t[6];
1009 if (edid->revision >= 4)
1010 vmax += ((t[4] & 0x02) ? 255 : 0);
1011 vsync = drm_mode_vrefresh(mode);
1012
1013 return (vsync <= vmax && vsync >= vmin);
1014 }
1015
1016 static u32
1017 range_pixel_clock(struct edid *edid, u8 *t)
1018 {
1019 /* unspecified */
1020 if (t[9] == 0 || t[9] == 255)
1021 return 0;
1022
1023 /* 1.4 with CVT support gives us real precision, yay */
1024 if (edid->revision >= 4 && t[10] == 0x04)
1025 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1026
1027 /* 1.3 is pathetic, so fuzz up a bit */
1028 return t[9] * 10000 + 5001;
1029 }
1030
1031 static bool
1032 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1033 struct detailed_timing *timing)
1034 {
1035 u32 max_clock;
1036 u8 *t = (u8 *)timing;
1037
1038 if (!mode_in_hsync_range(mode, edid, t))
1039 return false;
1040
1041 if (!mode_in_vsync_range(mode, edid, t))
1042 return false;
1043
1044 if ((max_clock = range_pixel_clock(edid, t)))
1045 if (mode->clock > max_clock)
1046 return false;
1047
1048 /* 1.4 max horizontal check */
1049 if (edid->revision >= 4 && t[10] == 0x04)
1050 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1051 return false;
1052
1053 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1054 return false;
1055
1056 return true;
1057 }
1058
1059 static bool valid_inferred_mode(const struct drm_connector *connector,
1060 const struct drm_display_mode *mode)
1061 {
1062 struct drm_display_mode *m;
1063 bool ok = false;
1064
1065 list_for_each_entry(m, &connector->probed_modes, head) {
1066 if (mode->hdisplay == m->hdisplay &&
1067 mode->vdisplay == m->vdisplay &&
1068 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m))
1069 return false; /* duplicated */
1070 if (mode->hdisplay <= m->hdisplay &&
1071 mode->vdisplay <= m->vdisplay)
1072 ok = true;
1073 }
1074 return ok;
1075 }
1076
1077 static int
1078 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1079 struct detailed_timing *timing)
1080 {
1081 int i, modes = 0;
1082 struct drm_display_mode *newmode;
1083 struct drm_device *dev = connector->dev;
1084
1085 for (i = 0; i < drm_num_dmt_modes; i++) {
1086 if (mode_in_range(drm_dmt_modes + i, edid, timing) &&
1087 valid_inferred_mode(connector, drm_dmt_modes + i)) {
1088 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1089 if (newmode) {
1090 drm_mode_probed_add(connector, newmode);
1091 modes++;
1092 }
1093 }
1094 }
1095
1096 return modes;
1097 }
1098
1099 /* fix up 1366x768 mode from 1368x768;
1100 * GFT/CVT can't express 1366 width which isn't dividable by 8
1101 */
1102 static void fixup_mode_1366x768(struct drm_display_mode *mode)
1103 {
1104 if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1105 mode->hdisplay = 1366;
1106 mode->hsync_start--;
1107 mode->hsync_end--;
1108 drm_mode_set_name(mode);
1109 }
1110 }
1111
1112 static int
1113 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1114 struct detailed_timing *timing)
1115 {
1116 int i, modes = 0;
1117 struct drm_display_mode *newmode;
1118 struct drm_device *dev = connector->dev;
1119
1120 for (i = 0; i < num_extra_modes; i++) {
1121 const struct minimode *m = &extra_modes[i];
1122 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1123 if (!newmode)
1124 return modes;
1125
1126 fixup_mode_1366x768(newmode);
1127 if (!mode_in_range(newmode, edid, timing) ||
1128 !valid_inferred_mode(connector, newmode)) {
1129 drm_mode_destroy(dev, newmode);
1130 continue;
1131 }
1132
1133 drm_mode_probed_add(connector, newmode);
1134 modes++;
1135 }
1136
1137 return modes;
1138 }
1139
1140 static int
1141 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1142 struct detailed_timing *timing)
1143 {
1144 int i, modes = 0;
1145 struct drm_display_mode *newmode;
1146 struct drm_device *dev = connector->dev;
1147 bool rb = drm_monitor_supports_rb(edid);
1148
1149 for (i = 0; i < num_extra_modes; i++) {
1150 const struct minimode *m = &extra_modes[i];
1151 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1152 if (!newmode)
1153 return modes;
1154
1155 fixup_mode_1366x768(newmode);
1156 if (!mode_in_range(newmode, edid, timing) ||
1157 !valid_inferred_mode(connector, newmode)) {
1158 drm_mode_destroy(dev, newmode);
1159 continue;
1160 }
1161
1162 drm_mode_probed_add(connector, newmode);
1163 modes++;
1164 }
1165
1166 return modes;
1167 }
1168
1169 static void
1170 do_inferred_modes(struct detailed_timing *timing, void *c)
1171 {
1172 struct detailed_mode_closure *closure = c;
1173 struct detailed_non_pixel *data = &timing->data.other_data;
1174 struct detailed_data_monitor_range *range = &data->data.range;
1175
1176 if (data->type != EDID_DETAIL_MONITOR_RANGE)
1177 return;
1178
1179 closure->modes += drm_dmt_modes_for_range(closure->connector,
1180 closure->edid,
1181 timing);
1182
1183 if (!version_greater(closure->edid, 1, 1))
1184 return; /* GTF not defined yet */
1185
1186 switch (range->flags) {
1187 case 0x02: /* secondary gtf, XXX could do more */
1188 case 0x00: /* default gtf */
1189 closure->modes += drm_gtf_modes_for_range(closure->connector,
1190 closure->edid,
1191 timing);
1192 break;
1193 case 0x04: /* cvt, only in 1.4+ */
1194 if (!version_greater(closure->edid, 1, 3))
1195 break;
1196
1197 closure->modes += drm_cvt_modes_for_range(closure->connector,
1198 closure->edid,
1199 timing);
1200 break;
1201 case 0x01: /* just the ranges, no formula */
1202 default:
1203 break;
1204 }
1205 }
1206
1207 static int
1208 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1209 {
1210 struct detailed_mode_closure closure = {
1211 connector, edid, 0, 0, 0
1212 };
1213
1214 if (version_greater(edid, 1, 0))
1215 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1216 &closure);
1217
1218 return closure.modes;
1219 }
1220
1221 static int
1222 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1223 {
1224 int i, j, m, modes = 0;
1225 struct drm_display_mode *mode;
1226 u8 *est = ((u8 *)timing) + 5;
1227
1228 for (i = 0; i < 6; i++) {
1229 for (j = 7; j > 0; j--) {
1230 m = (i * 8) + (7 - j);
1231 if (m >= ARRAY_SIZE(est3_modes))
1232 break;
1233 if (est[i] & (1 << j)) {
1234 mode = drm_mode_find_dmt(connector->dev,
1235 est3_modes[m].w,
1236 est3_modes[m].h,
1237 est3_modes[m].r,
1238 est3_modes[m].rb);
1239 if (mode) {
1240 drm_mode_probed_add(connector, mode);
1241 modes++;
1242 }
1243 }
1244 }
1245 }
1246
1247 return modes;
1248 }
1249
1250 static void
1251 do_established_modes(struct detailed_timing *timing, void *c)
1252 {
1253 struct detailed_mode_closure *closure = c;
1254 struct detailed_non_pixel *data = &timing->data.other_data;
1255
1256 if (data->type == EDID_DETAIL_EST_TIMINGS)
1257 closure->modes += drm_est3_modes(closure->connector, timing);
1258 }
1259
1260 /**
1261 * add_established_modes - get est. modes from EDID and add them
1262 * @edid: EDID block to scan
1263 *
1264 * Each EDID block contains a bitmap of the supported "established modes" list
1265 * (defined above). Tease them out and add them to the global modes list.
1266 */
1267 static int
1268 add_established_modes(struct drm_connector *connector, struct edid *edid)
1269 {
1270 struct drm_device *dev = connector->dev;
1271 unsigned long est_bits = edid->established_timings.t1 |
1272 (edid->established_timings.t2 << 8) |
1273 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1274 int i, modes = 0;
1275 struct detailed_mode_closure closure = {
1276 connector, edid, 0, 0, 0
1277 };
1278
1279 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1280 if (est_bits & (1<<i)) {
1281 struct drm_display_mode *newmode;
1282 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1283 if (newmode) {
1284 drm_mode_probed_add(connector, newmode);
1285 modes++;
1286 }
1287 }
1288 }
1289
1290 if (version_greater(edid, 1, 0))
1291 drm_for_each_detailed_block((u8 *)edid,
1292 do_established_modes, &closure);
1293
1294 return modes + closure.modes;
1295 }
1296
1297 static void
1298 do_standard_modes(struct detailed_timing *timing, void *c)
1299 {
1300 struct detailed_mode_closure *closure = c;
1301 struct detailed_non_pixel *data = &timing->data.other_data;
1302 struct drm_connector *connector = closure->connector;
1303 struct edid *edid = closure->edid;
1304
1305 if (data->type == EDID_DETAIL_STD_MODES) {
1306 int i;
1307 for (i = 0; i < 6; i++) {
1308 struct std_timing *std;
1309 struct drm_display_mode *newmode;
1310
1311 std = &data->data.timings[i];
1312 newmode = drm_mode_std(connector, edid, std,
1313 edid->revision);
1314 if (newmode) {
1315 drm_mode_probed_add(connector, newmode);
1316 closure->modes++;
1317 }
1318 }
1319 }
1320 }
1321
1322 /**
1323 * add_standard_modes - get std. modes from EDID and add them
1324 * @edid: EDID block to scan
1325 *
1326 * Standard modes can be calculated using the appropriate standard (DMT,
1327 * GTF or CVT. Grab them from @edid and add them to the list.
1328 */
1329 static int
1330 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1331 {
1332 int i, modes = 0;
1333 struct detailed_mode_closure closure = {
1334 connector, edid, 0, 0, 0
1335 };
1336
1337 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1338 struct drm_display_mode *newmode;
1339
1340 newmode = drm_mode_std(connector, edid,
1341 &edid->standard_timings[i],
1342 edid->revision);
1343 if (newmode) {
1344 drm_mode_probed_add(connector, newmode);
1345 modes++;
1346 }
1347 }
1348
1349 if (version_greater(edid, 1, 0))
1350 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1351 &closure);
1352
1353 /* XXX should also look for standard codes in VTB blocks */
1354
1355 return modes + closure.modes;
1356 }
1357
1358 static int drm_cvt_modes(struct drm_connector *connector,
1359 struct detailed_timing *timing)
1360 {
1361 int i, j, modes = 0;
1362 struct drm_display_mode *newmode;
1363 struct drm_device *dev = connector->dev;
1364 struct cvt_timing *cvt;
1365 const int rates[] = { 60, 85, 75, 60, 50 };
1366 const u8 empty[3] = { 0, 0, 0 };
1367
1368 for (i = 0; i < 4; i++) {
1369 int uninitialized_var(width), height;
1370 cvt = &(timing->data.other_data.data.cvt[i]);
1371
1372 if (!memcmp(cvt->code, empty, 3))
1373 continue;
1374
1375 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1376 switch (cvt->code[1] & 0x0c) {
1377 case 0x00:
1378 width = height * 4 / 3;
1379 break;
1380 case 0x04:
1381 width = height * 16 / 9;
1382 break;
1383 case 0x08:
1384 width = height * 16 / 10;
1385 break;
1386 case 0x0c:
1387 width = height * 15 / 9;
1388 break;
1389 }
1390
1391 for (j = 1; j < 5; j++) {
1392 if (cvt->code[2] & (1 << j)) {
1393 newmode = drm_cvt_mode(dev, width, height,
1394 rates[j], j == 0,
1395 false, false);
1396 if (newmode) {
1397 drm_mode_probed_add(connector, newmode);
1398 modes++;
1399 }
1400 }
1401 }
1402 }
1403
1404 return modes;
1405 }
1406
1407 static void
1408 do_cvt_mode(struct detailed_timing *timing, void *c)
1409 {
1410 struct detailed_mode_closure *closure = c;
1411 struct detailed_non_pixel *data = &timing->data.other_data;
1412
1413 if (data->type == EDID_DETAIL_CVT_3BYTE)
1414 closure->modes += drm_cvt_modes(closure->connector, timing);
1415 }
1416
1417 static int
1418 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1419 {
1420 struct detailed_mode_closure closure = {
1421 connector, edid, 0, 0, 0
1422 };
1423
1424 if (version_greater(edid, 1, 2))
1425 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1426
1427 /* XXX should also look for CVT codes in VTB blocks */
1428
1429 return closure.modes;
1430 }
1431
1432 static void
1433 do_detailed_mode(struct detailed_timing *timing, void *c)
1434 {
1435 struct detailed_mode_closure *closure = c;
1436 struct drm_display_mode *newmode;
1437
1438 if (timing->pixel_clock) {
1439 newmode = drm_mode_detailed(closure->connector->dev,
1440 closure->edid, timing,
1441 closure->quirks);
1442 if (!newmode)
1443 return;
1444
1445 if (closure->preferred)
1446 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1447
1448 drm_mode_probed_add(closure->connector, newmode);
1449 closure->modes++;
1450 closure->preferred = 0;
1451 }
1452 }
1453
1454 /*
1455 * add_detailed_modes - Add modes from detailed timings
1456 * @connector: attached connector
1457 * @edid: EDID block to scan
1458 * @quirks: quirks to apply
1459 */
1460 static int
1461 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1462 u32 quirks)
1463 {
1464 struct detailed_mode_closure closure = {
1465 connector,
1466 edid,
1467 1,
1468 quirks,
1469 0
1470 };
1471
1472 if (closure.preferred && !version_greater(edid, 1, 3))
1473 closure.preferred =
1474 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1475
1476 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1477
1478 return closure.modes;
1479 }
1480
1481 #define HDMI_IDENTIFIER 0x000C03
1482 #define AUDIO_BLOCK 0x01
1483 #define VIDEO_BLOCK 0x02
1484 #define VENDOR_BLOCK 0x03
1485 #define SPEAKER_BLOCK 0x04
1486 #define EDID_BASIC_AUDIO (1 << 6)
1487 #define EDID_CEA_YCRCB444 (1 << 5)
1488 #define EDID_CEA_YCRCB422 (1 << 4)
1489
1490 /**
1491 * Search EDID for CEA extension block.
1492 */
1493 u8 *drm_find_cea_extension(struct edid *edid)
1494 {
1495 u8 *edid_ext = NULL;
1496 int i;
1497
1498 /* No EDID or EDID extensions */
1499 if (edid == NULL || edid->extensions == 0)
1500 return NULL;
1501
1502 /* Find CEA extension */
1503 for (i = 0; i < edid->extensions; i++) {
1504 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1505 if (edid_ext[0] == CEA_EXT)
1506 break;
1507 }
1508
1509 if (i == edid->extensions)
1510 return NULL;
1511
1512 return edid_ext;
1513 }
1514 EXPORT_SYMBOL(drm_find_cea_extension);
1515
1516 /*
1517 * Looks for a CEA mode matching given drm_display_mode.
1518 * Returns its CEA Video ID code, or 0 if not found.
1519 */
1520 u8 drm_match_cea_mode(struct drm_display_mode *to_match)
1521 {
1522 struct drm_display_mode *cea_mode;
1523 u8 mode;
1524
1525 for (mode = 0; mode < drm_num_cea_modes; mode++) {
1526 cea_mode = (struct drm_display_mode *)&edid_cea_modes[mode];
1527
1528 if (drm_mode_equal(to_match, cea_mode))
1529 return mode + 1;
1530 }
1531 return 0;
1532 }
1533 EXPORT_SYMBOL(drm_match_cea_mode);
1534
1535
1536 static int
1537 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1538 {
1539 struct drm_device *dev = connector->dev;
1540 u8 * mode, cea_mode;
1541 int modes = 0;
1542
1543 for (mode = db; mode < db + len; mode++) {
1544 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1545 if (cea_mode < drm_num_cea_modes) {
1546 struct drm_display_mode *newmode;
1547 newmode = drm_mode_duplicate(dev,
1548 &edid_cea_modes[cea_mode]);
1549 if (newmode) {
1550 drm_mode_probed_add(connector, newmode);
1551 modes++;
1552 }
1553 }
1554 }
1555
1556 return modes;
1557 }
1558
1559 static int
1560 cea_db_payload_len(const u8 *db)
1561 {
1562 return db[0] & 0x1f;
1563 }
1564
1565 static int
1566 cea_db_tag(const u8 *db)
1567 {
1568 return db[0] >> 5;
1569 }
1570
1571 static int
1572 cea_revision(const u8 *cea)
1573 {
1574 return cea[1];
1575 }
1576
1577 static int
1578 cea_db_offsets(const u8 *cea, int *start, int *end)
1579 {
1580 /* Data block offset in CEA extension block */
1581 *start = 4;
1582 *end = cea[2];
1583 if (*end == 0)
1584 *end = 127;
1585 if (*end < 4 || *end > 127)
1586 return -ERANGE;
1587 return 0;
1588 }
1589
1590 #define for_each_cea_db(cea, i, start, end) \
1591 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
1592
1593 static int
1594 add_cea_modes(struct drm_connector *connector, struct edid *edid)
1595 {
1596 u8 * cea = drm_find_cea_extension(edid);
1597 u8 * db, dbl;
1598 int modes = 0;
1599
1600 if (cea && cea_revision(cea) >= 3) {
1601 int i, start, end;
1602
1603 if (cea_db_offsets(cea, &start, &end))
1604 return 0;
1605
1606 for_each_cea_db(cea, i, start, end) {
1607 db = &cea[i];
1608 dbl = cea_db_payload_len(db);
1609
1610 if (cea_db_tag(db) == VIDEO_BLOCK)
1611 modes += do_cea_modes (connector, db+1, dbl);
1612 }
1613 }
1614
1615 return modes;
1616 }
1617
1618 static void
1619 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db)
1620 {
1621 u8 len = cea_db_payload_len(db);
1622
1623 if (len >= 6) {
1624 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1625 connector->dvi_dual = db[6] & 1;
1626 }
1627 if (len >= 7)
1628 connector->max_tmds_clock = db[7] * 5;
1629 if (len >= 8) {
1630 connector->latency_present[0] = db[8] >> 7;
1631 connector->latency_present[1] = (db[8] >> 6) & 1;
1632 }
1633 if (len >= 9)
1634 connector->video_latency[0] = db[9];
1635 if (len >= 10)
1636 connector->audio_latency[0] = db[10];
1637 if (len >= 11)
1638 connector->video_latency[1] = db[11];
1639 if (len >= 12)
1640 connector->audio_latency[1] = db[12];
1641
1642 DRM_DEBUG_KMS("HDMI: DVI dual %d, "
1643 "max TMDS clock %d, "
1644 "latency present %d %d, "
1645 "video latency %d %d, "
1646 "audio latency %d %d\n",
1647 connector->dvi_dual,
1648 connector->max_tmds_clock,
1649 (int) connector->latency_present[0],
1650 (int) connector->latency_present[1],
1651 connector->video_latency[0],
1652 connector->video_latency[1],
1653 connector->audio_latency[0],
1654 connector->audio_latency[1]);
1655 }
1656
1657 static void
1658 monitor_name(struct detailed_timing *t, void *data)
1659 {
1660 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1661 *(u8 **)data = t->data.other_data.data.str.str;
1662 }
1663
1664 static bool cea_db_is_hdmi_vsdb(const u8 *db)
1665 {
1666 int hdmi_id;
1667
1668 if (cea_db_tag(db) != VENDOR_BLOCK)
1669 return false;
1670
1671 if (cea_db_payload_len(db) < 5)
1672 return false;
1673
1674 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16);
1675
1676 return hdmi_id == HDMI_IDENTIFIER;
1677 }
1678
1679 /**
1680 * drm_edid_to_eld - build ELD from EDID
1681 * @connector: connector corresponding to the HDMI/DP sink
1682 * @edid: EDID to parse
1683 *
1684 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1685 * Some ELD fields are left to the graphics driver caller:
1686 * - Conn_Type
1687 * - HDCP
1688 * - Port_ID
1689 */
1690 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1691 {
1692 uint8_t *eld = connector->eld;
1693 u8 *cea;
1694 u8 *name;
1695 u8 *db;
1696 int sad_count = 0;
1697 int mnl;
1698 int dbl;
1699
1700 memset(eld, 0, sizeof(connector->eld));
1701
1702 cea = drm_find_cea_extension(edid);
1703 if (!cea) {
1704 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1705 return;
1706 }
1707
1708 name = NULL;
1709 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1710 for (mnl = 0; name && mnl < 13; mnl++) {
1711 if (name[mnl] == 0x0a)
1712 break;
1713 eld[20 + mnl] = name[mnl];
1714 }
1715 eld[4] = (cea[1] << 5) | mnl;
1716 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1717
1718 eld[0] = 2 << 3; /* ELD version: 2 */
1719
1720 eld[16] = edid->mfg_id[0];
1721 eld[17] = edid->mfg_id[1];
1722 eld[18] = edid->prod_code[0];
1723 eld[19] = edid->prod_code[1];
1724
1725 if (cea_revision(cea) >= 3) {
1726 int i, start, end;
1727
1728 if (cea_db_offsets(cea, &start, &end)) {
1729 start = 0;
1730 end = 0;
1731 }
1732
1733 for_each_cea_db(cea, i, start, end) {
1734 db = &cea[i];
1735 dbl = cea_db_payload_len(db);
1736
1737 switch (cea_db_tag(db)) {
1738 case AUDIO_BLOCK:
1739 /* Audio Data Block, contains SADs */
1740 sad_count = dbl / 3;
1741 if (dbl >= 1)
1742 memcpy(eld + 20 + mnl, &db[1], dbl);
1743 break;
1744 case SPEAKER_BLOCK:
1745 /* Speaker Allocation Data Block */
1746 if (dbl >= 1)
1747 eld[7] = db[1];
1748 break;
1749 case VENDOR_BLOCK:
1750 /* HDMI Vendor-Specific Data Block */
1751 if (cea_db_is_hdmi_vsdb(db))
1752 parse_hdmi_vsdb(connector, db);
1753 break;
1754 default:
1755 break;
1756 }
1757 }
1758 }
1759 eld[5] |= sad_count << 4;
1760 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1761
1762 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1763 }
1764 EXPORT_SYMBOL(drm_edid_to_eld);
1765
1766 /**
1767 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1768 * @connector: connector associated with the HDMI/DP sink
1769 * @mode: the display mode
1770 */
1771 int drm_av_sync_delay(struct drm_connector *connector,
1772 struct drm_display_mode *mode)
1773 {
1774 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1775 int a, v;
1776
1777 if (!connector->latency_present[0])
1778 return 0;
1779 if (!connector->latency_present[1])
1780 i = 0;
1781
1782 a = connector->audio_latency[i];
1783 v = connector->video_latency[i];
1784
1785 /*
1786 * HDMI/DP sink doesn't support audio or video?
1787 */
1788 if (a == 255 || v == 255)
1789 return 0;
1790
1791 /*
1792 * Convert raw EDID values to millisecond.
1793 * Treat unknown latency as 0ms.
1794 */
1795 if (a)
1796 a = min(2 * (a - 1), 500);
1797 if (v)
1798 v = min(2 * (v - 1), 500);
1799
1800 return max(v - a, 0);
1801 }
1802 EXPORT_SYMBOL(drm_av_sync_delay);
1803
1804 /**
1805 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1806 * @encoder: the encoder just changed display mode
1807 * @mode: the adjusted display mode
1808 *
1809 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1810 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1811 */
1812 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1813 struct drm_display_mode *mode)
1814 {
1815 struct drm_connector *connector;
1816 struct drm_device *dev = encoder->dev;
1817
1818 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1819 if (connector->encoder == encoder && connector->eld[0])
1820 return connector;
1821
1822 return NULL;
1823 }
1824 EXPORT_SYMBOL(drm_select_eld);
1825
1826 /**
1827 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1828 * @edid: monitor EDID information
1829 *
1830 * Parse the CEA extension according to CEA-861-B.
1831 * Return true if HDMI, false if not or unknown.
1832 */
1833 bool drm_detect_hdmi_monitor(struct edid *edid)
1834 {
1835 u8 *edid_ext;
1836 int i;
1837 int start_offset, end_offset;
1838
1839 edid_ext = drm_find_cea_extension(edid);
1840 if (!edid_ext)
1841 return false;
1842
1843 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1844 return false;
1845
1846 /*
1847 * Because HDMI identifier is in Vendor Specific Block,
1848 * search it from all data blocks of CEA extension.
1849 */
1850 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1851 if (cea_db_is_hdmi_vsdb(&edid_ext[i]))
1852 return true;
1853 }
1854
1855 return false;
1856 }
1857 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1858
1859 /**
1860 * drm_detect_monitor_audio - check monitor audio capability
1861 *
1862 * Monitor should have CEA extension block.
1863 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1864 * audio' only. If there is any audio extension block and supported
1865 * audio format, assume at least 'basic audio' support, even if 'basic
1866 * audio' is not defined in EDID.
1867 *
1868 */
1869 bool drm_detect_monitor_audio(struct edid *edid)
1870 {
1871 u8 *edid_ext;
1872 int i, j;
1873 bool has_audio = false;
1874 int start_offset, end_offset;
1875
1876 edid_ext = drm_find_cea_extension(edid);
1877 if (!edid_ext)
1878 goto end;
1879
1880 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1881
1882 if (has_audio) {
1883 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1884 goto end;
1885 }
1886
1887 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1888 goto end;
1889
1890 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1891 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) {
1892 has_audio = true;
1893 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3)
1894 DRM_DEBUG_KMS("CEA audio format %d\n",
1895 (edid_ext[i + j] >> 3) & 0xf);
1896 goto end;
1897 }
1898 }
1899 end:
1900 return has_audio;
1901 }
1902 EXPORT_SYMBOL(drm_detect_monitor_audio);
1903
1904 /**
1905 * drm_add_display_info - pull display info out if present
1906 * @edid: EDID data
1907 * @info: display info (attached to connector)
1908 *
1909 * Grab any available display info and stuff it into the drm_display_info
1910 * structure that's part of the connector. Useful for tracking bpp and
1911 * color spaces.
1912 */
1913 static void drm_add_display_info(struct edid *edid,
1914 struct drm_display_info *info)
1915 {
1916 u8 *edid_ext;
1917
1918 info->width_mm = edid->width_cm * 10;
1919 info->height_mm = edid->height_cm * 10;
1920
1921 /* driver figures it out in this case */
1922 info->bpc = 0;
1923 info->color_formats = 0;
1924
1925 if (edid->revision < 3)
1926 return;
1927
1928 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1929 return;
1930
1931 /* Get data from CEA blocks if present */
1932 edid_ext = drm_find_cea_extension(edid);
1933 if (edid_ext) {
1934 info->cea_rev = edid_ext[1];
1935
1936 /* The existence of a CEA block should imply RGB support */
1937 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1938 if (edid_ext[3] & EDID_CEA_YCRCB444)
1939 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1940 if (edid_ext[3] & EDID_CEA_YCRCB422)
1941 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1942 }
1943
1944 /* Only defined for 1.4 with digital displays */
1945 if (edid->revision < 4)
1946 return;
1947
1948 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1949 case DRM_EDID_DIGITAL_DEPTH_6:
1950 info->bpc = 6;
1951 break;
1952 case DRM_EDID_DIGITAL_DEPTH_8:
1953 info->bpc = 8;
1954 break;
1955 case DRM_EDID_DIGITAL_DEPTH_10:
1956 info->bpc = 10;
1957 break;
1958 case DRM_EDID_DIGITAL_DEPTH_12:
1959 info->bpc = 12;
1960 break;
1961 case DRM_EDID_DIGITAL_DEPTH_14:
1962 info->bpc = 14;
1963 break;
1964 case DRM_EDID_DIGITAL_DEPTH_16:
1965 info->bpc = 16;
1966 break;
1967 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1968 default:
1969 info->bpc = 0;
1970 break;
1971 }
1972
1973 info->color_formats |= DRM_COLOR_FORMAT_RGB444;
1974 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
1975 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1976 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
1977 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1978 }
1979
1980 /**
1981 * drm_add_edid_modes - add modes from EDID data, if available
1982 * @connector: connector we're probing
1983 * @edid: edid data
1984 *
1985 * Add the specified modes to the connector's mode list.
1986 *
1987 * Return number of modes added or 0 if we couldn't find any.
1988 */
1989 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1990 {
1991 int num_modes = 0;
1992 u32 quirks;
1993
1994 if (edid == NULL) {
1995 return 0;
1996 }
1997 if (!drm_edid_is_valid(edid)) {
1998 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1999 drm_get_connector_name(connector));
2000 return 0;
2001 }
2002
2003 quirks = edid_get_quirks(edid);
2004
2005 /*
2006 * EDID spec says modes should be preferred in this order:
2007 * - preferred detailed mode
2008 * - other detailed modes from base block
2009 * - detailed modes from extension blocks
2010 * - CVT 3-byte code modes
2011 * - standard timing codes
2012 * - established timing codes
2013 * - modes inferred from GTF or CVT range information
2014 *
2015 * We get this pretty much right.
2016 *
2017 * XXX order for additional mode types in extension blocks?
2018 */
2019 num_modes += add_detailed_modes(connector, edid, quirks);
2020 num_modes += add_cvt_modes(connector, edid);
2021 num_modes += add_standard_modes(connector, edid);
2022 num_modes += add_established_modes(connector, edid);
2023 num_modes += add_inferred_modes(connector, edid);
2024 num_modes += add_cea_modes(connector, edid);
2025
2026 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
2027 edid_fixup_preferred(connector, quirks);
2028
2029 drm_add_display_info(edid, &connector->display_info);
2030
2031 return num_modes;
2032 }
2033 EXPORT_SYMBOL(drm_add_edid_modes);
2034
2035 /**
2036 * drm_add_modes_noedid - add modes for the connectors without EDID
2037 * @connector: connector we're probing
2038 * @hdisplay: the horizontal display limit
2039 * @vdisplay: the vertical display limit
2040 *
2041 * Add the specified modes to the connector's mode list. Only when the
2042 * hdisplay/vdisplay is not beyond the given limit, it will be added.
2043 *
2044 * Return number of modes added or 0 if we couldn't find any.
2045 */
2046 int drm_add_modes_noedid(struct drm_connector *connector,
2047 int hdisplay, int vdisplay)
2048 {
2049 int i, count, num_modes = 0;
2050 struct drm_display_mode *mode;
2051 struct drm_device *dev = connector->dev;
2052
2053 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
2054 if (hdisplay < 0)
2055 hdisplay = 0;
2056 if (vdisplay < 0)
2057 vdisplay = 0;
2058
2059 for (i = 0; i < count; i++) {
2060 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
2061 if (hdisplay && vdisplay) {
2062 /*
2063 * Only when two are valid, they will be used to check
2064 * whether the mode should be added to the mode list of
2065 * the connector.
2066 */
2067 if (ptr->hdisplay > hdisplay ||
2068 ptr->vdisplay > vdisplay)
2069 continue;
2070 }
2071 if (drm_mode_vrefresh(ptr) > 61)
2072 continue;
2073 mode = drm_mode_duplicate(dev, ptr);
2074 if (mode) {
2075 drm_mode_probed_add(connector, mode);
2076 num_modes++;
2077 }
2078 }
2079 return num_modes;
2080 }
2081 EXPORT_SYMBOL(drm_add_modes_noedid);
2082
2083 /**
2084 * drm_mode_cea_vic - return the CEA-861 VIC of a given mode
2085 * @mode: mode
2086 *
2087 * RETURNS:
2088 * The VIC number, 0 in case it's not a CEA-861 mode.
2089 */
2090 uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode)
2091 {
2092 uint8_t i;
2093
2094 for (i = 0; i < drm_num_cea_modes; i++)
2095 if (drm_mode_equal(mode, &edid_cea_modes[i]))
2096 return i + 1;
2097
2098 return 0;
2099 }
2100 EXPORT_SYMBOL(drm_mode_cea_vic);
Linux 2.6 libata-dev (mirror)