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Merge tag 'staging-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[deliverable/linux.git] / drivers / gpu / drm / drm_edid.c
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 "drmP.h"
35 #include "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 /* Acer AL1706 */
91 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
92 /* Acer F51 */
93 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
94 /* Unknown Acer */
95 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
96
97 /* Belinea 10 15 55 */
98 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
99 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
100
101 /* Envision Peripherals, Inc. EN-7100e */
102 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
103 /* Envision EN2028 */
104 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
105
106 /* Funai Electronics PM36B */
107 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
108 EDID_QUIRK_DETAILED_IN_CM },
109
110 /* LG Philips LCD LP154W01-A5 */
111 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
112 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
113
114 /* Philips 107p5 CRT */
115 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
116
117 /* Proview AY765C */
118 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
119
120 /* Samsung SyncMaster 205BW. Note: irony */
121 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
122 /* Samsung SyncMaster 22[5-6]BW */
123 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
124 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
125
126 /* ViewSonic VA2026w */
127 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
128 };
129
130 /*** DDC fetch and block validation ***/
131
132 static const u8 edid_header[] = {
133 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
134 };
135
136 /*
137 * Sanity check the header of the base EDID block. Return 8 if the header
138 * is perfect, down to 0 if it's totally wrong.
139 */
140 int drm_edid_header_is_valid(const u8 *raw_edid)
141 {
142 int i, score = 0;
143
144 for (i = 0; i < sizeof(edid_header); i++)
145 if (raw_edid[i] == edid_header[i])
146 score++;
147
148 return score;
149 }
150 EXPORT_SYMBOL(drm_edid_header_is_valid);
151
152 static int edid_fixup __read_mostly = 6;
153 module_param_named(edid_fixup, edid_fixup, int, 0400);
154 MODULE_PARM_DESC(edid_fixup,
155 "Minimum number of valid EDID header bytes (0-8, default 6)");
156
157 /*
158 * Sanity check the EDID block (base or extension). Return 0 if the block
159 * doesn't check out, or 1 if it's valid.
160 */
161 bool drm_edid_block_valid(u8 *raw_edid, int block)
162 {
163 int i;
164 u8 csum = 0;
165 struct edid *edid = (struct edid *)raw_edid;
166
167 if (edid_fixup > 8 || edid_fixup < 0)
168 edid_fixup = 6;
169
170 if (block == 0) {
171 int score = drm_edid_header_is_valid(raw_edid);
172 if (score == 8) ;
173 else if (score >= edid_fixup) {
174 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
175 memcpy(raw_edid, edid_header, sizeof(edid_header));
176 } else {
177 goto bad;
178 }
179 }
180
181 for (i = 0; i < EDID_LENGTH; i++)
182 csum += raw_edid[i];
183 if (csum) {
184 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
185
186 /* allow CEA to slide through, switches mangle this */
187 if (raw_edid[0] != 0x02)
188 goto bad;
189 }
190
191 /* per-block-type checks */
192 switch (raw_edid[0]) {
193 case 0: /* base */
194 if (edid->version != 1) {
195 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
196 goto bad;
197 }
198
199 if (edid->revision > 4)
200 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
201 break;
202
203 default:
204 break;
205 }
206
207 return 1;
208
209 bad:
210 if (raw_edid) {
211 printk(KERN_ERR "Raw EDID:\n");
212 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
213 raw_edid, EDID_LENGTH, false);
214 }
215 return 0;
216 }
217 EXPORT_SYMBOL(drm_edid_block_valid);
218
219 /**
220 * drm_edid_is_valid - sanity check EDID data
221 * @edid: EDID data
222 *
223 * Sanity-check an entire EDID record (including extensions)
224 */
225 bool drm_edid_is_valid(struct edid *edid)
226 {
227 int i;
228 u8 *raw = (u8 *)edid;
229
230 if (!edid)
231 return false;
232
233 for (i = 0; i <= edid->extensions; i++)
234 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i))
235 return false;
236
237 return true;
238 }
239 EXPORT_SYMBOL(drm_edid_is_valid);
240
241 #define DDC_SEGMENT_ADDR 0x30
242 /**
243 * Get EDID information via I2C.
244 *
245 * \param adapter : i2c device adaptor
246 * \param buf : EDID data buffer to be filled
247 * \param len : EDID data buffer length
248 * \return 0 on success or -1 on failure.
249 *
250 * Try to fetch EDID information by calling i2c driver function.
251 */
252 static int
253 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
254 int block, int len)
255 {
256 unsigned char start = block * EDID_LENGTH;
257 int ret, retries = 5;
258
259 /* The core i2c driver will automatically retry the transfer if the
260 * adapter reports EAGAIN. However, we find that bit-banging transfers
261 * are susceptible to errors under a heavily loaded machine and
262 * generate spurious NAKs and timeouts. Retrying the transfer
263 * of the individual block a few times seems to overcome this.
264 */
265 do {
266 struct i2c_msg msgs[] = {
267 {
268 .addr = DDC_ADDR,
269 .flags = 0,
270 .len = 1,
271 .buf = &start,
272 }, {
273 .addr = DDC_ADDR,
274 .flags = I2C_M_RD,
275 .len = len,
276 .buf = buf,
277 }
278 };
279 ret = i2c_transfer(adapter, msgs, 2);
280 if (ret == -ENXIO) {
281 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
282 adapter->name);
283 break;
284 }
285 } while (ret != 2 && --retries);
286
287 return ret == 2 ? 0 : -1;
288 }
289
290 static bool drm_edid_is_zero(u8 *in_edid, int length)
291 {
292 int i;
293 u32 *raw_edid = (u32 *)in_edid;
294
295 for (i = 0; i < length / 4; i++)
296 if (*(raw_edid + i) != 0)
297 return false;
298 return true;
299 }
300
301 static u8 *
302 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
303 {
304 int i, j = 0, valid_extensions = 0;
305 u8 *block, *new;
306
307 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
308 return NULL;
309
310 /* base block fetch */
311 for (i = 0; i < 4; i++) {
312 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
313 goto out;
314 if (drm_edid_block_valid(block, 0))
315 break;
316 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
317 connector->null_edid_counter++;
318 goto carp;
319 }
320 }
321 if (i == 4)
322 goto carp;
323
324 /* if there's no extensions, we're done */
325 if (block[0x7e] == 0)
326 return block;
327
328 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
329 if (!new)
330 goto out;
331 block = new;
332
333 for (j = 1; j <= block[0x7e]; j++) {
334 for (i = 0; i < 4; i++) {
335 if (drm_do_probe_ddc_edid(adapter,
336 block + (valid_extensions + 1) * EDID_LENGTH,
337 j, EDID_LENGTH))
338 goto out;
339 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j)) {
340 valid_extensions++;
341 break;
342 }
343 }
344 if (i == 4)
345 dev_warn(connector->dev->dev,
346 "%s: Ignoring invalid EDID block %d.\n",
347 drm_get_connector_name(connector), j);
348 }
349
350 if (valid_extensions != block[0x7e]) {
351 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
352 block[0x7e] = valid_extensions;
353 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
354 if (!new)
355 goto out;
356 block = new;
357 }
358
359 return block;
360
361 carp:
362 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
363 drm_get_connector_name(connector), j);
364
365 out:
366 kfree(block);
367 return NULL;
368 }
369
370 /**
371 * Probe DDC presence.
372 *
373 * \param adapter : i2c device adaptor
374 * \return 1 on success
375 */
376 static bool
377 drm_probe_ddc(struct i2c_adapter *adapter)
378 {
379 unsigned char out;
380
381 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
382 }
383
384 /**
385 * drm_get_edid - get EDID data, if available
386 * @connector: connector we're probing
387 * @adapter: i2c adapter to use for DDC
388 *
389 * Poke the given i2c channel to grab EDID data if possible. If found,
390 * attach it to the connector.
391 *
392 * Return edid data or NULL if we couldn't find any.
393 */
394 struct edid *drm_get_edid(struct drm_connector *connector,
395 struct i2c_adapter *adapter)
396 {
397 struct edid *edid = NULL;
398
399 if (drm_probe_ddc(adapter))
400 edid = (struct edid *)drm_do_get_edid(connector, adapter);
401
402 connector->display_info.raw_edid = (char *)edid;
403
404 return edid;
405
406 }
407 EXPORT_SYMBOL(drm_get_edid);
408
409 /*** EDID parsing ***/
410
411 /**
412 * edid_vendor - match a string against EDID's obfuscated vendor field
413 * @edid: EDID to match
414 * @vendor: vendor string
415 *
416 * Returns true if @vendor is in @edid, false otherwise
417 */
418 static bool edid_vendor(struct edid *edid, char *vendor)
419 {
420 char edid_vendor[3];
421
422 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
423 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
424 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
425 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
426
427 return !strncmp(edid_vendor, vendor, 3);
428 }
429
430 /**
431 * edid_get_quirks - return quirk flags for a given EDID
432 * @edid: EDID to process
433 *
434 * This tells subsequent routines what fixes they need to apply.
435 */
436 static u32 edid_get_quirks(struct edid *edid)
437 {
438 struct edid_quirk *quirk;
439 int i;
440
441 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
442 quirk = &edid_quirk_list[i];
443
444 if (edid_vendor(edid, quirk->vendor) &&
445 (EDID_PRODUCT_ID(edid) == quirk->product_id))
446 return quirk->quirks;
447 }
448
449 return 0;
450 }
451
452 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
453 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
454
455 /**
456 * edid_fixup_preferred - set preferred modes based on quirk list
457 * @connector: has mode list to fix up
458 * @quirks: quirks list
459 *
460 * Walk the mode list for @connector, clearing the preferred status
461 * on existing modes and setting it anew for the right mode ala @quirks.
462 */
463 static void edid_fixup_preferred(struct drm_connector *connector,
464 u32 quirks)
465 {
466 struct drm_display_mode *t, *cur_mode, *preferred_mode;
467 int target_refresh = 0;
468
469 if (list_empty(&connector->probed_modes))
470 return;
471
472 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
473 target_refresh = 60;
474 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
475 target_refresh = 75;
476
477 preferred_mode = list_first_entry(&connector->probed_modes,
478 struct drm_display_mode, head);
479
480 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
481 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
482
483 if (cur_mode == preferred_mode)
484 continue;
485
486 /* Largest mode is preferred */
487 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
488 preferred_mode = cur_mode;
489
490 /* At a given size, try to get closest to target refresh */
491 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
492 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
493 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
494 preferred_mode = cur_mode;
495 }
496 }
497
498 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
499 }
500
501 static bool
502 mode_is_rb(const struct drm_display_mode *mode)
503 {
504 return (mode->htotal - mode->hdisplay == 160) &&
505 (mode->hsync_end - mode->hdisplay == 80) &&
506 (mode->hsync_end - mode->hsync_start == 32) &&
507 (mode->vsync_start - mode->vdisplay == 3);
508 }
509
510 /*
511 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
512 * @dev: Device to duplicate against
513 * @hsize: Mode width
514 * @vsize: Mode height
515 * @fresh: Mode refresh rate
516 * @rb: Mode reduced-blanking-ness
517 *
518 * Walk the DMT mode list looking for a match for the given parameters.
519 * Return a newly allocated copy of the mode, or NULL if not found.
520 */
521 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
522 int hsize, int vsize, int fresh,
523 bool rb)
524 {
525 int i;
526
527 for (i = 0; i < drm_num_dmt_modes; i++) {
528 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
529 if (hsize != ptr->hdisplay)
530 continue;
531 if (vsize != ptr->vdisplay)
532 continue;
533 if (fresh != drm_mode_vrefresh(ptr))
534 continue;
535 if (rb != mode_is_rb(ptr))
536 continue;
537
538 return drm_mode_duplicate(dev, ptr);
539 }
540
541 return NULL;
542 }
543 EXPORT_SYMBOL(drm_mode_find_dmt);
544
545 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
546
547 static void
548 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
549 {
550 int i, n = 0;
551 u8 d = ext[0x02];
552 u8 *det_base = ext + d;
553
554 n = (127 - d) / 18;
555 for (i = 0; i < n; i++)
556 cb((struct detailed_timing *)(det_base + 18 * i), closure);
557 }
558
559 static void
560 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
561 {
562 unsigned int i, n = min((int)ext[0x02], 6);
563 u8 *det_base = ext + 5;
564
565 if (ext[0x01] != 1)
566 return; /* unknown version */
567
568 for (i = 0; i < n; i++)
569 cb((struct detailed_timing *)(det_base + 18 * i), closure);
570 }
571
572 static void
573 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
574 {
575 int i;
576 struct edid *edid = (struct edid *)raw_edid;
577
578 if (edid == NULL)
579 return;
580
581 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
582 cb(&(edid->detailed_timings[i]), closure);
583
584 for (i = 1; i <= raw_edid[0x7e]; i++) {
585 u8 *ext = raw_edid + (i * EDID_LENGTH);
586 switch (*ext) {
587 case CEA_EXT:
588 cea_for_each_detailed_block(ext, cb, closure);
589 break;
590 case VTB_EXT:
591 vtb_for_each_detailed_block(ext, cb, closure);
592 break;
593 default:
594 break;
595 }
596 }
597 }
598
599 static void
600 is_rb(struct detailed_timing *t, void *data)
601 {
602 u8 *r = (u8 *)t;
603 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
604 if (r[15] & 0x10)
605 *(bool *)data = true;
606 }
607
608 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
609 static bool
610 drm_monitor_supports_rb(struct edid *edid)
611 {
612 if (edid->revision >= 4) {
613 bool ret = false;
614 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
615 return ret;
616 }
617
618 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
619 }
620
621 static void
622 find_gtf2(struct detailed_timing *t, void *data)
623 {
624 u8 *r = (u8 *)t;
625 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
626 *(u8 **)data = r;
627 }
628
629 /* Secondary GTF curve kicks in above some break frequency */
630 static int
631 drm_gtf2_hbreak(struct edid *edid)
632 {
633 u8 *r = NULL;
634 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
635 return r ? (r[12] * 2) : 0;
636 }
637
638 static int
639 drm_gtf2_2c(struct edid *edid)
640 {
641 u8 *r = NULL;
642 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
643 return r ? r[13] : 0;
644 }
645
646 static int
647 drm_gtf2_m(struct edid *edid)
648 {
649 u8 *r = NULL;
650 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
651 return r ? (r[15] << 8) + r[14] : 0;
652 }
653
654 static int
655 drm_gtf2_k(struct edid *edid)
656 {
657 u8 *r = NULL;
658 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
659 return r ? r[16] : 0;
660 }
661
662 static int
663 drm_gtf2_2j(struct edid *edid)
664 {
665 u8 *r = NULL;
666 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
667 return r ? r[17] : 0;
668 }
669
670 /**
671 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
672 * @edid: EDID block to scan
673 */
674 static int standard_timing_level(struct edid *edid)
675 {
676 if (edid->revision >= 2) {
677 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
678 return LEVEL_CVT;
679 if (drm_gtf2_hbreak(edid))
680 return LEVEL_GTF2;
681 return LEVEL_GTF;
682 }
683 return LEVEL_DMT;
684 }
685
686 /*
687 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
688 * monitors fill with ascii space (0x20) instead.
689 */
690 static int
691 bad_std_timing(u8 a, u8 b)
692 {
693 return (a == 0x00 && b == 0x00) ||
694 (a == 0x01 && b == 0x01) ||
695 (a == 0x20 && b == 0x20);
696 }
697
698 /**
699 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
700 * @t: standard timing params
701 * @timing_level: standard timing level
702 *
703 * Take the standard timing params (in this case width, aspect, and refresh)
704 * and convert them into a real mode using CVT/GTF/DMT.
705 */
706 static struct drm_display_mode *
707 drm_mode_std(struct drm_connector *connector, struct edid *edid,
708 struct std_timing *t, int revision)
709 {
710 struct drm_device *dev = connector->dev;
711 struct drm_display_mode *m, *mode = NULL;
712 int hsize, vsize;
713 int vrefresh_rate;
714 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
715 >> EDID_TIMING_ASPECT_SHIFT;
716 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
717 >> EDID_TIMING_VFREQ_SHIFT;
718 int timing_level = standard_timing_level(edid);
719
720 if (bad_std_timing(t->hsize, t->vfreq_aspect))
721 return NULL;
722
723 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
724 hsize = t->hsize * 8 + 248;
725 /* vrefresh_rate = vfreq + 60 */
726 vrefresh_rate = vfreq + 60;
727 /* the vdisplay is calculated based on the aspect ratio */
728 if (aspect_ratio == 0) {
729 if (revision < 3)
730 vsize = hsize;
731 else
732 vsize = (hsize * 10) / 16;
733 } else if (aspect_ratio == 1)
734 vsize = (hsize * 3) / 4;
735 else if (aspect_ratio == 2)
736 vsize = (hsize * 4) / 5;
737 else
738 vsize = (hsize * 9) / 16;
739
740 /* HDTV hack, part 1 */
741 if (vrefresh_rate == 60 &&
742 ((hsize == 1360 && vsize == 765) ||
743 (hsize == 1368 && vsize == 769))) {
744 hsize = 1366;
745 vsize = 768;
746 }
747
748 /*
749 * If this connector already has a mode for this size and refresh
750 * rate (because it came from detailed or CVT info), use that
751 * instead. This way we don't have to guess at interlace or
752 * reduced blanking.
753 */
754 list_for_each_entry(m, &connector->probed_modes, head)
755 if (m->hdisplay == hsize && m->vdisplay == vsize &&
756 drm_mode_vrefresh(m) == vrefresh_rate)
757 return NULL;
758
759 /* HDTV hack, part 2 */
760 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
761 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
762 false);
763 mode->hdisplay = 1366;
764 mode->hsync_start = mode->hsync_start - 1;
765 mode->hsync_end = mode->hsync_end - 1;
766 return mode;
767 }
768
769 /* check whether it can be found in default mode table */
770 if (drm_monitor_supports_rb(edid)) {
771 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
772 true);
773 if (mode)
774 return mode;
775 }
776 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
777 if (mode)
778 return mode;
779
780 /* okay, generate it */
781 switch (timing_level) {
782 case LEVEL_DMT:
783 break;
784 case LEVEL_GTF:
785 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
786 break;
787 case LEVEL_GTF2:
788 /*
789 * This is potentially wrong if there's ever a monitor with
790 * more than one ranges section, each claiming a different
791 * secondary GTF curve. Please don't do that.
792 */
793 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
794 if (!mode)
795 return NULL;
796 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
797 drm_mode_destroy(dev, mode);
798 mode = drm_gtf_mode_complex(dev, hsize, vsize,
799 vrefresh_rate, 0, 0,
800 drm_gtf2_m(edid),
801 drm_gtf2_2c(edid),
802 drm_gtf2_k(edid),
803 drm_gtf2_2j(edid));
804 }
805 break;
806 case LEVEL_CVT:
807 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
808 false);
809 break;
810 }
811 return mode;
812 }
813
814 /*
815 * EDID is delightfully ambiguous about how interlaced modes are to be
816 * encoded. Our internal representation is of frame height, but some
817 * HDTV detailed timings are encoded as field height.
818 *
819 * The format list here is from CEA, in frame size. Technically we
820 * should be checking refresh rate too. Whatever.
821 */
822 static void
823 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
824 struct detailed_pixel_timing *pt)
825 {
826 int i;
827 static const struct {
828 int w, h;
829 } cea_interlaced[] = {
830 { 1920, 1080 },
831 { 720, 480 },
832 { 1440, 480 },
833 { 2880, 480 },
834 { 720, 576 },
835 { 1440, 576 },
836 { 2880, 576 },
837 };
838
839 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
840 return;
841
842 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
843 if ((mode->hdisplay == cea_interlaced[i].w) &&
844 (mode->vdisplay == cea_interlaced[i].h / 2)) {
845 mode->vdisplay *= 2;
846 mode->vsync_start *= 2;
847 mode->vsync_end *= 2;
848 mode->vtotal *= 2;
849 mode->vtotal |= 1;
850 }
851 }
852
853 mode->flags |= DRM_MODE_FLAG_INTERLACE;
854 }
855
856 /**
857 * drm_mode_detailed - create a new mode from an EDID detailed timing section
858 * @dev: DRM device (needed to create new mode)
859 * @edid: EDID block
860 * @timing: EDID detailed timing info
861 * @quirks: quirks to apply
862 *
863 * An EDID detailed timing block contains enough info for us to create and
864 * return a new struct drm_display_mode.
865 */
866 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
867 struct edid *edid,
868 struct detailed_timing *timing,
869 u32 quirks)
870 {
871 struct drm_display_mode *mode;
872 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
873 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
874 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
875 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
876 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
877 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
878 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
879 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
880 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
881
882 /* ignore tiny modes */
883 if (hactive < 64 || vactive < 64)
884 return NULL;
885
886 if (pt->misc & DRM_EDID_PT_STEREO) {
887 printk(KERN_WARNING "stereo mode not supported\n");
888 return NULL;
889 }
890 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
891 printk(KERN_WARNING "composite sync not supported\n");
892 }
893
894 /* it is incorrect if hsync/vsync width is zero */
895 if (!hsync_pulse_width || !vsync_pulse_width) {
896 DRM_DEBUG_KMS("Incorrect Detailed timing. "
897 "Wrong Hsync/Vsync pulse width\n");
898 return NULL;
899 }
900
901 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
902 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
903 if (!mode)
904 return NULL;
905
906 goto set_size;
907 }
908
909 mode = drm_mode_create(dev);
910 if (!mode)
911 return NULL;
912
913 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
914 timing->pixel_clock = cpu_to_le16(1088);
915
916 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
917
918 mode->hdisplay = hactive;
919 mode->hsync_start = mode->hdisplay + hsync_offset;
920 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
921 mode->htotal = mode->hdisplay + hblank;
922
923 mode->vdisplay = vactive;
924 mode->vsync_start = mode->vdisplay + vsync_offset;
925 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
926 mode->vtotal = mode->vdisplay + vblank;
927
928 /* Some EDIDs have bogus h/vtotal values */
929 if (mode->hsync_end > mode->htotal)
930 mode->htotal = mode->hsync_end + 1;
931 if (mode->vsync_end > mode->vtotal)
932 mode->vtotal = mode->vsync_end + 1;
933
934 drm_mode_do_interlace_quirk(mode, pt);
935
936 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
937 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
938 }
939
940 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
941 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
942 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
943 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
944
945 set_size:
946 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
947 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
948
949 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
950 mode->width_mm *= 10;
951 mode->height_mm *= 10;
952 }
953
954 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
955 mode->width_mm = edid->width_cm * 10;
956 mode->height_mm = edid->height_cm * 10;
957 }
958
959 mode->type = DRM_MODE_TYPE_DRIVER;
960 drm_mode_set_name(mode);
961
962 return mode;
963 }
964
965 static bool
966 mode_in_hsync_range(const struct drm_display_mode *mode,
967 struct edid *edid, u8 *t)
968 {
969 int hsync, hmin, hmax;
970
971 hmin = t[7];
972 if (edid->revision >= 4)
973 hmin += ((t[4] & 0x04) ? 255 : 0);
974 hmax = t[8];
975 if (edid->revision >= 4)
976 hmax += ((t[4] & 0x08) ? 255 : 0);
977 hsync = drm_mode_hsync(mode);
978
979 return (hsync <= hmax && hsync >= hmin);
980 }
981
982 static bool
983 mode_in_vsync_range(const struct drm_display_mode *mode,
984 struct edid *edid, u8 *t)
985 {
986 int vsync, vmin, vmax;
987
988 vmin = t[5];
989 if (edid->revision >= 4)
990 vmin += ((t[4] & 0x01) ? 255 : 0);
991 vmax = t[6];
992 if (edid->revision >= 4)
993 vmax += ((t[4] & 0x02) ? 255 : 0);
994 vsync = drm_mode_vrefresh(mode);
995
996 return (vsync <= vmax && vsync >= vmin);
997 }
998
999 static u32
1000 range_pixel_clock(struct edid *edid, u8 *t)
1001 {
1002 /* unspecified */
1003 if (t[9] == 0 || t[9] == 255)
1004 return 0;
1005
1006 /* 1.4 with CVT support gives us real precision, yay */
1007 if (edid->revision >= 4 && t[10] == 0x04)
1008 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1009
1010 /* 1.3 is pathetic, so fuzz up a bit */
1011 return t[9] * 10000 + 5001;
1012 }
1013
1014 static bool
1015 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1016 struct detailed_timing *timing)
1017 {
1018 u32 max_clock;
1019 u8 *t = (u8 *)timing;
1020
1021 if (!mode_in_hsync_range(mode, edid, t))
1022 return false;
1023
1024 if (!mode_in_vsync_range(mode, edid, t))
1025 return false;
1026
1027 if ((max_clock = range_pixel_clock(edid, t)))
1028 if (mode->clock > max_clock)
1029 return false;
1030
1031 /* 1.4 max horizontal check */
1032 if (edid->revision >= 4 && t[10] == 0x04)
1033 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1034 return false;
1035
1036 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1037 return false;
1038
1039 return true;
1040 }
1041
1042 static bool valid_inferred_mode(const struct drm_connector *connector,
1043 const struct drm_display_mode *mode)
1044 {
1045 struct drm_display_mode *m;
1046 bool ok = false;
1047
1048 list_for_each_entry(m, &connector->probed_modes, head) {
1049 if (mode->hdisplay == m->hdisplay &&
1050 mode->vdisplay == m->vdisplay &&
1051 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m))
1052 return false; /* duplicated */
1053 if (mode->hdisplay <= m->hdisplay &&
1054 mode->vdisplay <= m->vdisplay)
1055 ok = true;
1056 }
1057 return ok;
1058 }
1059
1060 static int
1061 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1062 struct detailed_timing *timing)
1063 {
1064 int i, modes = 0;
1065 struct drm_display_mode *newmode;
1066 struct drm_device *dev = connector->dev;
1067
1068 for (i = 0; i < drm_num_dmt_modes; i++) {
1069 if (mode_in_range(drm_dmt_modes + i, edid, timing) &&
1070 valid_inferred_mode(connector, drm_dmt_modes + i)) {
1071 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1072 if (newmode) {
1073 drm_mode_probed_add(connector, newmode);
1074 modes++;
1075 }
1076 }
1077 }
1078
1079 return modes;
1080 }
1081
1082 /* fix up 1366x768 mode from 1368x768;
1083 * GFT/CVT can't express 1366 width which isn't dividable by 8
1084 */
1085 static void fixup_mode_1366x768(struct drm_display_mode *mode)
1086 {
1087 if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1088 mode->hdisplay = 1366;
1089 mode->hsync_start--;
1090 mode->hsync_end--;
1091 drm_mode_set_name(mode);
1092 }
1093 }
1094
1095 static int
1096 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1097 struct detailed_timing *timing)
1098 {
1099 int i, modes = 0;
1100 struct drm_display_mode *newmode;
1101 struct drm_device *dev = connector->dev;
1102
1103 for (i = 0; i < num_extra_modes; i++) {
1104 const struct minimode *m = &extra_modes[i];
1105 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1106 if (!newmode)
1107 return modes;
1108
1109 fixup_mode_1366x768(newmode);
1110 if (!mode_in_range(newmode, edid, timing) ||
1111 !valid_inferred_mode(connector, newmode)) {
1112 drm_mode_destroy(dev, newmode);
1113 continue;
1114 }
1115
1116 drm_mode_probed_add(connector, newmode);
1117 modes++;
1118 }
1119
1120 return modes;
1121 }
1122
1123 static int
1124 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1125 struct detailed_timing *timing)
1126 {
1127 int i, modes = 0;
1128 struct drm_display_mode *newmode;
1129 struct drm_device *dev = connector->dev;
1130 bool rb = drm_monitor_supports_rb(edid);
1131
1132 for (i = 0; i < num_extra_modes; i++) {
1133 const struct minimode *m = &extra_modes[i];
1134 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1135 if (!newmode)
1136 return modes;
1137
1138 fixup_mode_1366x768(newmode);
1139 if (!mode_in_range(newmode, edid, timing) ||
1140 !valid_inferred_mode(connector, newmode)) {
1141 drm_mode_destroy(dev, newmode);
1142 continue;
1143 }
1144
1145 drm_mode_probed_add(connector, newmode);
1146 modes++;
1147 }
1148
1149 return modes;
1150 }
1151
1152 static void
1153 do_inferred_modes(struct detailed_timing *timing, void *c)
1154 {
1155 struct detailed_mode_closure *closure = c;
1156 struct detailed_non_pixel *data = &timing->data.other_data;
1157 struct detailed_data_monitor_range *range = &data->data.range;
1158
1159 if (data->type != EDID_DETAIL_MONITOR_RANGE)
1160 return;
1161
1162 closure->modes += drm_dmt_modes_for_range(closure->connector,
1163 closure->edid,
1164 timing);
1165
1166 if (!version_greater(closure->edid, 1, 1))
1167 return; /* GTF not defined yet */
1168
1169 switch (range->flags) {
1170 case 0x02: /* secondary gtf, XXX could do more */
1171 case 0x00: /* default gtf */
1172 closure->modes += drm_gtf_modes_for_range(closure->connector,
1173 closure->edid,
1174 timing);
1175 break;
1176 case 0x04: /* cvt, only in 1.4+ */
1177 if (!version_greater(closure->edid, 1, 3))
1178 break;
1179
1180 closure->modes += drm_cvt_modes_for_range(closure->connector,
1181 closure->edid,
1182 timing);
1183 break;
1184 case 0x01: /* just the ranges, no formula */
1185 default:
1186 break;
1187 }
1188 }
1189
1190 static int
1191 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1192 {
1193 struct detailed_mode_closure closure = {
1194 connector, edid, 0, 0, 0
1195 };
1196
1197 if (version_greater(edid, 1, 0))
1198 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1199 &closure);
1200
1201 return closure.modes;
1202 }
1203
1204 static int
1205 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1206 {
1207 int i, j, m, modes = 0;
1208 struct drm_display_mode *mode;
1209 u8 *est = ((u8 *)timing) + 5;
1210
1211 for (i = 0; i < 6; i++) {
1212 for (j = 7; j > 0; j--) {
1213 m = (i * 8) + (7 - j);
1214 if (m >= ARRAY_SIZE(est3_modes))
1215 break;
1216 if (est[i] & (1 << j)) {
1217 mode = drm_mode_find_dmt(connector->dev,
1218 est3_modes[m].w,
1219 est3_modes[m].h,
1220 est3_modes[m].r,
1221 est3_modes[m].rb);
1222 if (mode) {
1223 drm_mode_probed_add(connector, mode);
1224 modes++;
1225 }
1226 }
1227 }
1228 }
1229
1230 return modes;
1231 }
1232
1233 static void
1234 do_established_modes(struct detailed_timing *timing, void *c)
1235 {
1236 struct detailed_mode_closure *closure = c;
1237 struct detailed_non_pixel *data = &timing->data.other_data;
1238
1239 if (data->type == EDID_DETAIL_EST_TIMINGS)
1240 closure->modes += drm_est3_modes(closure->connector, timing);
1241 }
1242
1243 /**
1244 * add_established_modes - get est. modes from EDID and add them
1245 * @edid: EDID block to scan
1246 *
1247 * Each EDID block contains a bitmap of the supported "established modes" list
1248 * (defined above). Tease them out and add them to the global modes list.
1249 */
1250 static int
1251 add_established_modes(struct drm_connector *connector, struct edid *edid)
1252 {
1253 struct drm_device *dev = connector->dev;
1254 unsigned long est_bits = edid->established_timings.t1 |
1255 (edid->established_timings.t2 << 8) |
1256 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1257 int i, modes = 0;
1258 struct detailed_mode_closure closure = {
1259 connector, edid, 0, 0, 0
1260 };
1261
1262 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1263 if (est_bits & (1<<i)) {
1264 struct drm_display_mode *newmode;
1265 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1266 if (newmode) {
1267 drm_mode_probed_add(connector, newmode);
1268 modes++;
1269 }
1270 }
1271 }
1272
1273 if (version_greater(edid, 1, 0))
1274 drm_for_each_detailed_block((u8 *)edid,
1275 do_established_modes, &closure);
1276
1277 return modes + closure.modes;
1278 }
1279
1280 static void
1281 do_standard_modes(struct detailed_timing *timing, void *c)
1282 {
1283 struct detailed_mode_closure *closure = c;
1284 struct detailed_non_pixel *data = &timing->data.other_data;
1285 struct drm_connector *connector = closure->connector;
1286 struct edid *edid = closure->edid;
1287
1288 if (data->type == EDID_DETAIL_STD_MODES) {
1289 int i;
1290 for (i = 0; i < 6; i++) {
1291 struct std_timing *std;
1292 struct drm_display_mode *newmode;
1293
1294 std = &data->data.timings[i];
1295 newmode = drm_mode_std(connector, edid, std,
1296 edid->revision);
1297 if (newmode) {
1298 drm_mode_probed_add(connector, newmode);
1299 closure->modes++;
1300 }
1301 }
1302 }
1303 }
1304
1305 /**
1306 * add_standard_modes - get std. modes from EDID and add them
1307 * @edid: EDID block to scan
1308 *
1309 * Standard modes can be calculated using the appropriate standard (DMT,
1310 * GTF or CVT. Grab them from @edid and add them to the list.
1311 */
1312 static int
1313 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1314 {
1315 int i, modes = 0;
1316 struct detailed_mode_closure closure = {
1317 connector, edid, 0, 0, 0
1318 };
1319
1320 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1321 struct drm_display_mode *newmode;
1322
1323 newmode = drm_mode_std(connector, edid,
1324 &edid->standard_timings[i],
1325 edid->revision);
1326 if (newmode) {
1327 drm_mode_probed_add(connector, newmode);
1328 modes++;
1329 }
1330 }
1331
1332 if (version_greater(edid, 1, 0))
1333 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1334 &closure);
1335
1336 /* XXX should also look for standard codes in VTB blocks */
1337
1338 return modes + closure.modes;
1339 }
1340
1341 static int drm_cvt_modes(struct drm_connector *connector,
1342 struct detailed_timing *timing)
1343 {
1344 int i, j, modes = 0;
1345 struct drm_display_mode *newmode;
1346 struct drm_device *dev = connector->dev;
1347 struct cvt_timing *cvt;
1348 const int rates[] = { 60, 85, 75, 60, 50 };
1349 const u8 empty[3] = { 0, 0, 0 };
1350
1351 for (i = 0; i < 4; i++) {
1352 int uninitialized_var(width), height;
1353 cvt = &(timing->data.other_data.data.cvt[i]);
1354
1355 if (!memcmp(cvt->code, empty, 3))
1356 continue;
1357
1358 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1359 switch (cvt->code[1] & 0x0c) {
1360 case 0x00:
1361 width = height * 4 / 3;
1362 break;
1363 case 0x04:
1364 width = height * 16 / 9;
1365 break;
1366 case 0x08:
1367 width = height * 16 / 10;
1368 break;
1369 case 0x0c:
1370 width = height * 15 / 9;
1371 break;
1372 }
1373
1374 for (j = 1; j < 5; j++) {
1375 if (cvt->code[2] & (1 << j)) {
1376 newmode = drm_cvt_mode(dev, width, height,
1377 rates[j], j == 0,
1378 false, false);
1379 if (newmode) {
1380 drm_mode_probed_add(connector, newmode);
1381 modes++;
1382 }
1383 }
1384 }
1385 }
1386
1387 return modes;
1388 }
1389
1390 static void
1391 do_cvt_mode(struct detailed_timing *timing, void *c)
1392 {
1393 struct detailed_mode_closure *closure = c;
1394 struct detailed_non_pixel *data = &timing->data.other_data;
1395
1396 if (data->type == EDID_DETAIL_CVT_3BYTE)
1397 closure->modes += drm_cvt_modes(closure->connector, timing);
1398 }
1399
1400 static int
1401 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1402 {
1403 struct detailed_mode_closure closure = {
1404 connector, edid, 0, 0, 0
1405 };
1406
1407 if (version_greater(edid, 1, 2))
1408 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1409
1410 /* XXX should also look for CVT codes in VTB blocks */
1411
1412 return closure.modes;
1413 }
1414
1415 static void
1416 do_detailed_mode(struct detailed_timing *timing, void *c)
1417 {
1418 struct detailed_mode_closure *closure = c;
1419 struct drm_display_mode *newmode;
1420
1421 if (timing->pixel_clock) {
1422 newmode = drm_mode_detailed(closure->connector->dev,
1423 closure->edid, timing,
1424 closure->quirks);
1425 if (!newmode)
1426 return;
1427
1428 if (closure->preferred)
1429 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1430
1431 drm_mode_probed_add(closure->connector, newmode);
1432 closure->modes++;
1433 closure->preferred = 0;
1434 }
1435 }
1436
1437 /*
1438 * add_detailed_modes - Add modes from detailed timings
1439 * @connector: attached connector
1440 * @edid: EDID block to scan
1441 * @quirks: quirks to apply
1442 */
1443 static int
1444 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1445 u32 quirks)
1446 {
1447 struct detailed_mode_closure closure = {
1448 connector,
1449 edid,
1450 1,
1451 quirks,
1452 0
1453 };
1454
1455 if (closure.preferred && !version_greater(edid, 1, 3))
1456 closure.preferred =
1457 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1458
1459 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1460
1461 return closure.modes;
1462 }
1463
1464 #define HDMI_IDENTIFIER 0x000C03
1465 #define AUDIO_BLOCK 0x01
1466 #define VIDEO_BLOCK 0x02
1467 #define VENDOR_BLOCK 0x03
1468 #define SPEAKER_BLOCK 0x04
1469 #define EDID_BASIC_AUDIO (1 << 6)
1470 #define EDID_CEA_YCRCB444 (1 << 5)
1471 #define EDID_CEA_YCRCB422 (1 << 4)
1472
1473 /**
1474 * Search EDID for CEA extension block.
1475 */
1476 u8 *drm_find_cea_extension(struct edid *edid)
1477 {
1478 u8 *edid_ext = NULL;
1479 int i;
1480
1481 /* No EDID or EDID extensions */
1482 if (edid == NULL || edid->extensions == 0)
1483 return NULL;
1484
1485 /* Find CEA extension */
1486 for (i = 0; i < edid->extensions; i++) {
1487 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1488 if (edid_ext[0] == CEA_EXT)
1489 break;
1490 }
1491
1492 if (i == edid->extensions)
1493 return NULL;
1494
1495 return edid_ext;
1496 }
1497 EXPORT_SYMBOL(drm_find_cea_extension);
1498
1499 static int
1500 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1501 {
1502 struct drm_device *dev = connector->dev;
1503 u8 * mode, cea_mode;
1504 int modes = 0;
1505
1506 for (mode = db; mode < db + len; mode++) {
1507 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1508 if (cea_mode < drm_num_cea_modes) {
1509 struct drm_display_mode *newmode;
1510 newmode = drm_mode_duplicate(dev,
1511 &edid_cea_modes[cea_mode]);
1512 if (newmode) {
1513 drm_mode_probed_add(connector, newmode);
1514 modes++;
1515 }
1516 }
1517 }
1518
1519 return modes;
1520 }
1521
1522 static int
1523 add_cea_modes(struct drm_connector *connector, struct edid *edid)
1524 {
1525 u8 * cea = drm_find_cea_extension(edid);
1526 u8 * db, dbl;
1527 int modes = 0;
1528
1529 if (cea && cea[1] >= 3) {
1530 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1531 dbl = db[0] & 0x1f;
1532 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK)
1533 modes += do_cea_modes (connector, db+1, dbl);
1534 }
1535 }
1536
1537 return modes;
1538 }
1539
1540 static void
1541 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db)
1542 {
1543 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1544
1545 connector->dvi_dual = db[6] & 1;
1546 connector->max_tmds_clock = db[7] * 5;
1547
1548 connector->latency_present[0] = db[8] >> 7;
1549 connector->latency_present[1] = (db[8] >> 6) & 1;
1550 connector->video_latency[0] = db[9];
1551 connector->audio_latency[0] = db[10];
1552 connector->video_latency[1] = db[11];
1553 connector->audio_latency[1] = db[12];
1554
1555 DRM_LOG_KMS("HDMI: DVI dual %d, "
1556 "max TMDS clock %d, "
1557 "latency present %d %d, "
1558 "video latency %d %d, "
1559 "audio latency %d %d\n",
1560 connector->dvi_dual,
1561 connector->max_tmds_clock,
1562 (int) connector->latency_present[0],
1563 (int) connector->latency_present[1],
1564 connector->video_latency[0],
1565 connector->video_latency[1],
1566 connector->audio_latency[0],
1567 connector->audio_latency[1]);
1568 }
1569
1570 static void
1571 monitor_name(struct detailed_timing *t, void *data)
1572 {
1573 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1574 *(u8 **)data = t->data.other_data.data.str.str;
1575 }
1576
1577 /**
1578 * drm_edid_to_eld - build ELD from EDID
1579 * @connector: connector corresponding to the HDMI/DP sink
1580 * @edid: EDID to parse
1581 *
1582 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1583 * Some ELD fields are left to the graphics driver caller:
1584 * - Conn_Type
1585 * - HDCP
1586 * - Port_ID
1587 */
1588 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1589 {
1590 uint8_t *eld = connector->eld;
1591 u8 *cea;
1592 u8 *name;
1593 u8 *db;
1594 int sad_count = 0;
1595 int mnl;
1596 int dbl;
1597
1598 memset(eld, 0, sizeof(connector->eld));
1599
1600 cea = drm_find_cea_extension(edid);
1601 if (!cea) {
1602 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1603 return;
1604 }
1605
1606 name = NULL;
1607 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1608 for (mnl = 0; name && mnl < 13; mnl++) {
1609 if (name[mnl] == 0x0a)
1610 break;
1611 eld[20 + mnl] = name[mnl];
1612 }
1613 eld[4] = (cea[1] << 5) | mnl;
1614 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1615
1616 eld[0] = 2 << 3; /* ELD version: 2 */
1617
1618 eld[16] = edid->mfg_id[0];
1619 eld[17] = edid->mfg_id[1];
1620 eld[18] = edid->prod_code[0];
1621 eld[19] = edid->prod_code[1];
1622
1623 if (cea[1] >= 3)
1624 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1625 dbl = db[0] & 0x1f;
1626
1627 switch ((db[0] & 0xe0) >> 5) {
1628 case AUDIO_BLOCK:
1629 /* Audio Data Block, contains SADs */
1630 sad_count = dbl / 3;
1631 memcpy(eld + 20 + mnl, &db[1], dbl);
1632 break;
1633 case SPEAKER_BLOCK:
1634 /* Speaker Allocation Data Block */
1635 eld[7] = db[1];
1636 break;
1637 case VENDOR_BLOCK:
1638 /* HDMI Vendor-Specific Data Block */
1639 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0)
1640 parse_hdmi_vsdb(connector, db);
1641 break;
1642 default:
1643 break;
1644 }
1645 }
1646 eld[5] |= sad_count << 4;
1647 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1648
1649 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1650 }
1651 EXPORT_SYMBOL(drm_edid_to_eld);
1652
1653 /**
1654 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1655 * @connector: connector associated with the HDMI/DP sink
1656 * @mode: the display mode
1657 */
1658 int drm_av_sync_delay(struct drm_connector *connector,
1659 struct drm_display_mode *mode)
1660 {
1661 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1662 int a, v;
1663
1664 if (!connector->latency_present[0])
1665 return 0;
1666 if (!connector->latency_present[1])
1667 i = 0;
1668
1669 a = connector->audio_latency[i];
1670 v = connector->video_latency[i];
1671
1672 /*
1673 * HDMI/DP sink doesn't support audio or video?
1674 */
1675 if (a == 255 || v == 255)
1676 return 0;
1677
1678 /*
1679 * Convert raw EDID values to millisecond.
1680 * Treat unknown latency as 0ms.
1681 */
1682 if (a)
1683 a = min(2 * (a - 1), 500);
1684 if (v)
1685 v = min(2 * (v - 1), 500);
1686
1687 return max(v - a, 0);
1688 }
1689 EXPORT_SYMBOL(drm_av_sync_delay);
1690
1691 /**
1692 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1693 * @encoder: the encoder just changed display mode
1694 * @mode: the adjusted display mode
1695 *
1696 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1697 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1698 */
1699 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1700 struct drm_display_mode *mode)
1701 {
1702 struct drm_connector *connector;
1703 struct drm_device *dev = encoder->dev;
1704
1705 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1706 if (connector->encoder == encoder && connector->eld[0])
1707 return connector;
1708
1709 return NULL;
1710 }
1711 EXPORT_SYMBOL(drm_select_eld);
1712
1713 /**
1714 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1715 * @edid: monitor EDID information
1716 *
1717 * Parse the CEA extension according to CEA-861-B.
1718 * Return true if HDMI, false if not or unknown.
1719 */
1720 bool drm_detect_hdmi_monitor(struct edid *edid)
1721 {
1722 u8 *edid_ext;
1723 int i, hdmi_id;
1724 int start_offset, end_offset;
1725 bool is_hdmi = false;
1726
1727 edid_ext = drm_find_cea_extension(edid);
1728 if (!edid_ext)
1729 goto end;
1730
1731 /* Data block offset in CEA extension block */
1732 start_offset = 4;
1733 end_offset = edid_ext[2];
1734
1735 /*
1736 * Because HDMI identifier is in Vendor Specific Block,
1737 * search it from all data blocks of CEA extension.
1738 */
1739 for (i = start_offset; i < end_offset;
1740 /* Increased by data block len */
1741 i += ((edid_ext[i] & 0x1f) + 1)) {
1742 /* Find vendor specific block */
1743 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1744 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1745 edid_ext[i + 3] << 16;
1746 /* Find HDMI identifier */
1747 if (hdmi_id == HDMI_IDENTIFIER)
1748 is_hdmi = true;
1749 break;
1750 }
1751 }
1752
1753 end:
1754 return is_hdmi;
1755 }
1756 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1757
1758 /**
1759 * drm_detect_monitor_audio - check monitor audio capability
1760 *
1761 * Monitor should have CEA extension block.
1762 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1763 * audio' only. If there is any audio extension block and supported
1764 * audio format, assume at least 'basic audio' support, even if 'basic
1765 * audio' is not defined in EDID.
1766 *
1767 */
1768 bool drm_detect_monitor_audio(struct edid *edid)
1769 {
1770 u8 *edid_ext;
1771 int i, j;
1772 bool has_audio = false;
1773 int start_offset, end_offset;
1774
1775 edid_ext = drm_find_cea_extension(edid);
1776 if (!edid_ext)
1777 goto end;
1778
1779 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1780
1781 if (has_audio) {
1782 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1783 goto end;
1784 }
1785
1786 /* Data block offset in CEA extension block */
1787 start_offset = 4;
1788 end_offset = edid_ext[2];
1789
1790 for (i = start_offset; i < end_offset;
1791 i += ((edid_ext[i] & 0x1f) + 1)) {
1792 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1793 has_audio = true;
1794 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1795 DRM_DEBUG_KMS("CEA audio format %d\n",
1796 (edid_ext[i + j] >> 3) & 0xf);
1797 goto end;
1798 }
1799 }
1800 end:
1801 return has_audio;
1802 }
1803 EXPORT_SYMBOL(drm_detect_monitor_audio);
1804
1805 /**
1806 * drm_add_display_info - pull display info out if present
1807 * @edid: EDID data
1808 * @info: display info (attached to connector)
1809 *
1810 * Grab any available display info and stuff it into the drm_display_info
1811 * structure that's part of the connector. Useful for tracking bpp and
1812 * color spaces.
1813 */
1814 static void drm_add_display_info(struct edid *edid,
1815 struct drm_display_info *info)
1816 {
1817 u8 *edid_ext;
1818
1819 info->width_mm = edid->width_cm * 10;
1820 info->height_mm = edid->height_cm * 10;
1821
1822 /* driver figures it out in this case */
1823 info->bpc = 0;
1824 info->color_formats = 0;
1825
1826 if (edid->revision < 3)
1827 return;
1828
1829 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1830 return;
1831
1832 /* Get data from CEA blocks if present */
1833 edid_ext = drm_find_cea_extension(edid);
1834 if (edid_ext) {
1835 info->cea_rev = edid_ext[1];
1836
1837 /* The existence of a CEA block should imply RGB support */
1838 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1839 if (edid_ext[3] & EDID_CEA_YCRCB444)
1840 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1841 if (edid_ext[3] & EDID_CEA_YCRCB422)
1842 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1843 }
1844
1845 /* Only defined for 1.4 with digital displays */
1846 if (edid->revision < 4)
1847 return;
1848
1849 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1850 case DRM_EDID_DIGITAL_DEPTH_6:
1851 info->bpc = 6;
1852 break;
1853 case DRM_EDID_DIGITAL_DEPTH_8:
1854 info->bpc = 8;
1855 break;
1856 case DRM_EDID_DIGITAL_DEPTH_10:
1857 info->bpc = 10;
1858 break;
1859 case DRM_EDID_DIGITAL_DEPTH_12:
1860 info->bpc = 12;
1861 break;
1862 case DRM_EDID_DIGITAL_DEPTH_14:
1863 info->bpc = 14;
1864 break;
1865 case DRM_EDID_DIGITAL_DEPTH_16:
1866 info->bpc = 16;
1867 break;
1868 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1869 default:
1870 info->bpc = 0;
1871 break;
1872 }
1873
1874 info->color_formats |= DRM_COLOR_FORMAT_RGB444;
1875 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
1876 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1877 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
1878 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1879 }
1880
1881 /**
1882 * drm_add_edid_modes - add modes from EDID data, if available
1883 * @connector: connector we're probing
1884 * @edid: edid data
1885 *
1886 * Add the specified modes to the connector's mode list.
1887 *
1888 * Return number of modes added or 0 if we couldn't find any.
1889 */
1890 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1891 {
1892 int num_modes = 0;
1893 u32 quirks;
1894
1895 if (edid == NULL) {
1896 return 0;
1897 }
1898 if (!drm_edid_is_valid(edid)) {
1899 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1900 drm_get_connector_name(connector));
1901 return 0;
1902 }
1903
1904 quirks = edid_get_quirks(edid);
1905
1906 /*
1907 * EDID spec says modes should be preferred in this order:
1908 * - preferred detailed mode
1909 * - other detailed modes from base block
1910 * - detailed modes from extension blocks
1911 * - CVT 3-byte code modes
1912 * - standard timing codes
1913 * - established timing codes
1914 * - modes inferred from GTF or CVT range information
1915 *
1916 * We get this pretty much right.
1917 *
1918 * XXX order for additional mode types in extension blocks?
1919 */
1920 num_modes += add_detailed_modes(connector, edid, quirks);
1921 num_modes += add_cvt_modes(connector, edid);
1922 num_modes += add_standard_modes(connector, edid);
1923 num_modes += add_established_modes(connector, edid);
1924 num_modes += add_inferred_modes(connector, edid);
1925 num_modes += add_cea_modes(connector, edid);
1926
1927 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1928 edid_fixup_preferred(connector, quirks);
1929
1930 drm_add_display_info(edid, &connector->display_info);
1931
1932 return num_modes;
1933 }
1934 EXPORT_SYMBOL(drm_add_edid_modes);
1935
1936 /**
1937 * drm_add_modes_noedid - add modes for the connectors without EDID
1938 * @connector: connector we're probing
1939 * @hdisplay: the horizontal display limit
1940 * @vdisplay: the vertical display limit
1941 *
1942 * Add the specified modes to the connector's mode list. Only when the
1943 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1944 *
1945 * Return number of modes added or 0 if we couldn't find any.
1946 */
1947 int drm_add_modes_noedid(struct drm_connector *connector,
1948 int hdisplay, int vdisplay)
1949 {
1950 int i, count, num_modes = 0;
1951 struct drm_display_mode *mode;
1952 struct drm_device *dev = connector->dev;
1953
1954 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1955 if (hdisplay < 0)
1956 hdisplay = 0;
1957 if (vdisplay < 0)
1958 vdisplay = 0;
1959
1960 for (i = 0; i < count; i++) {
1961 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1962 if (hdisplay && vdisplay) {
1963 /*
1964 * Only when two are valid, they will be used to check
1965 * whether the mode should be added to the mode list of
1966 * the connector.
1967 */
1968 if (ptr->hdisplay > hdisplay ||
1969 ptr->vdisplay > vdisplay)
1970 continue;
1971 }
1972 if (drm_mode_vrefresh(ptr) > 61)
1973 continue;
1974 mode = drm_mode_duplicate(dev, ptr);
1975 if (mode) {
1976 drm_mode_probed_add(connector, mode);
1977 num_modes++;
1978 }
1979 }
1980 return num_modes;
1981 }
1982 EXPORT_SYMBOL(drm_add_modes_noedid);
Linux kernel - Deliverables
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