2 * Copyright (c) 2006 Luc Verhaegen (quirks list)
3 * Copyright (c) 2007-2008 Intel Corporation
4 * Jesse Barnes <jesse.barnes@intel.com>
5 * Copyright 2010 Red Hat, Inc.
7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
9 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sub license,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice (including the
19 * next paragraph) shall be included in all copies or substantial portions
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28 * DEALINGS IN THE SOFTWARE.
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/i2c.h>
33 #include <linux/module.h>
35 #include <drm/drm_edid.h>
36 #include "drm_edid_modes.h"
38 #define version_greater(edid, maj, min) \
39 (((edid)->version > (maj)) || \
40 ((edid)->version == (maj) && (edid)->revision > (min)))
42 #define EDID_EST_TIMINGS 16
43 #define EDID_STD_TIMINGS 8
44 #define EDID_DETAILED_TIMINGS 4
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).
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.
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)
72 struct detailed_mode_closure {
73 struct drm_connector *connector;
85 static struct edid_quirk {
89 } edid_quirk_list[] = {
91 { "ACI", 0x22a2, EDID_QUIRK_FORCE_REDUCED_BLANKING },
94 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
96 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
98 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
100 /* Belinea 10 15 55 */
101 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
102 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
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 },
109 /* Funai Electronics PM36B */
110 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
111 EDID_QUIRK_DETAILED_IN_CM },
113 /* LG Philips LCD LP154W01-A5 */
114 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
115 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
117 /* Philips 107p5 CRT */
118 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
121 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
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 },
129 /* ViewSonic VA2026w */
130 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
133 /*** DDC fetch and block validation ***/
135 static const u8 edid_header[] = {
136 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
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.
143 int drm_edid_header_is_valid(const u8 *raw_edid)
147 for (i = 0; i < sizeof(edid_header); i++)
148 if (raw_edid[i] == edid_header[i])
153 EXPORT_SYMBOL(drm_edid_header_is_valid);
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)");
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.
164 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
168 struct edid *edid = (struct edid *)raw_edid;
170 if (edid_fixup > 8 || edid_fixup < 0)
174 int score = drm_edid_header_is_valid(raw_edid);
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));
184 for (i = 0; i < EDID_LENGTH; i++)
187 if (print_bad_edid) {
188 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
191 /* allow CEA to slide through, switches mangle this */
192 if (raw_edid[0] != 0x02)
196 /* per-block-type checks */
197 switch (raw_edid[0]) {
199 if (edid->version != 1) {
200 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
204 if (edid->revision > 4)
205 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
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);
222 EXPORT_SYMBOL(drm_edid_block_valid);
225 * drm_edid_is_valid - sanity check EDID data
228 * Sanity-check an entire EDID record (including extensions)
230 bool drm_edid_is_valid(struct edid *edid)
233 u8 *raw = (u8 *)edid;
238 for (i = 0; i <= edid->extensions; i++)
239 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true))
244 EXPORT_SYMBOL(drm_edid_is_valid);
246 #define DDC_SEGMENT_ADDR 0x30
248 * Get EDID information via I2C.
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.
255 * Try to fetch EDID information by calling i2c driver function.
258 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
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;
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.
273 struct i2c_msg msgs[] = {
275 .addr = DDC_SEGMENT_ADDR,
293 * Avoid sending the segment addr to not upset non-compliant ddc
296 ret = i2c_transfer(adapter, &msgs[3 - xfers], xfers);
299 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
303 } while (ret != xfers && --retries);
305 return ret == xfers ? 0 : -1;
308 static bool drm_edid_is_zero(u8 *in_edid, int length)
311 u32 *raw_edid = (u32 *)in_edid;
313 for (i = 0; i < length / 4; i++)
314 if (*(raw_edid + i) != 0)
320 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
322 int i, j = 0, valid_extensions = 0;
324 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
326 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
329 /* base block fetch */
330 for (i = 0; i < 4; i++) {
331 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
333 if (drm_edid_block_valid(block, 0, print_bad_edid))
335 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
336 connector->null_edid_counter++;
343 /* if there's no extensions, we're done */
344 if (block[0x7e] == 0)
347 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
352 for (j = 1; j <= block[0x7e]; j++) {
353 for (i = 0; i < 4; i++) {
354 if (drm_do_probe_ddc_edid(adapter,
355 block + (valid_extensions + 1) * EDID_LENGTH,
358 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) {
364 dev_warn(connector->dev->dev,
365 "%s: Ignoring invalid EDID block %d.\n",
366 drm_get_connector_name(connector), j);
369 if (valid_extensions != block[0x7e]) {
370 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
371 block[0x7e] = valid_extensions;
372 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
381 if (print_bad_edid) {
382 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
383 drm_get_connector_name(connector), j);
385 connector->bad_edid_counter++;
393 * Probe DDC presence.
395 * \param adapter : i2c device adaptor
396 * \return 1 on success
399 drm_probe_ddc(struct i2c_adapter *adapter)
403 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
405 EXPORT_SYMBOL(drm_probe_ddc);
408 * drm_get_edid - get EDID data, if available
409 * @connector: connector we're probing
410 * @adapter: i2c adapter to use for DDC
412 * Poke the given i2c channel to grab EDID data if possible. If found,
413 * attach it to the connector.
415 * Return edid data or NULL if we couldn't find any.
417 struct edid *drm_get_edid(struct drm_connector *connector,
418 struct i2c_adapter *adapter)
420 struct edid *edid = NULL;
422 if (drm_probe_ddc(adapter))
423 edid = (struct edid *)drm_do_get_edid(connector, adapter);
427 EXPORT_SYMBOL(drm_get_edid);
429 /*** EDID parsing ***/
432 * edid_vendor - match a string against EDID's obfuscated vendor field
433 * @edid: EDID to match
434 * @vendor: vendor string
436 * Returns true if @vendor is in @edid, false otherwise
438 static bool edid_vendor(struct edid *edid, char *vendor)
442 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
443 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
444 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
445 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
447 return !strncmp(edid_vendor, vendor, 3);
451 * edid_get_quirks - return quirk flags for a given EDID
452 * @edid: EDID to process
454 * This tells subsequent routines what fixes they need to apply.
456 static u32 edid_get_quirks(struct edid *edid)
458 struct edid_quirk *quirk;
461 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
462 quirk = &edid_quirk_list[i];
464 if (edid_vendor(edid, quirk->vendor) &&
465 (EDID_PRODUCT_ID(edid) == quirk->product_id))
466 return quirk->quirks;
472 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
473 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
476 * edid_fixup_preferred - set preferred modes based on quirk list
477 * @connector: has mode list to fix up
478 * @quirks: quirks list
480 * Walk the mode list for @connector, clearing the preferred status
481 * on existing modes and setting it anew for the right mode ala @quirks.
483 static void edid_fixup_preferred(struct drm_connector *connector,
486 struct drm_display_mode *t, *cur_mode, *preferred_mode;
487 int target_refresh = 0;
489 if (list_empty(&connector->probed_modes))
492 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
494 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
497 preferred_mode = list_first_entry(&connector->probed_modes,
498 struct drm_display_mode, head);
500 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
501 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
503 if (cur_mode == preferred_mode)
506 /* Largest mode is preferred */
507 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
508 preferred_mode = cur_mode;
510 /* At a given size, try to get closest to target refresh */
511 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
512 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
513 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
514 preferred_mode = cur_mode;
518 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
522 mode_is_rb(const struct drm_display_mode *mode)
524 return (mode->htotal - mode->hdisplay == 160) &&
525 (mode->hsync_end - mode->hdisplay == 80) &&
526 (mode->hsync_end - mode->hsync_start == 32) &&
527 (mode->vsync_start - mode->vdisplay == 3);
531 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
532 * @dev: Device to duplicate against
534 * @vsize: Mode height
535 * @fresh: Mode refresh rate
536 * @rb: Mode reduced-blanking-ness
538 * Walk the DMT mode list looking for a match for the given parameters.
539 * Return a newly allocated copy of the mode, or NULL if not found.
541 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
542 int hsize, int vsize, int fresh,
547 for (i = 0; i < drm_num_dmt_modes; i++) {
548 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
549 if (hsize != ptr->hdisplay)
551 if (vsize != ptr->vdisplay)
553 if (fresh != drm_mode_vrefresh(ptr))
555 if (rb != mode_is_rb(ptr))
558 return drm_mode_duplicate(dev, ptr);
563 EXPORT_SYMBOL(drm_mode_find_dmt);
565 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
568 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
572 u8 *det_base = ext + d;
575 for (i = 0; i < n; i++)
576 cb((struct detailed_timing *)(det_base + 18 * i), closure);
580 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
582 unsigned int i, n = min((int)ext[0x02], 6);
583 u8 *det_base = ext + 5;
586 return; /* unknown version */
588 for (i = 0; i < n; i++)
589 cb((struct detailed_timing *)(det_base + 18 * i), closure);
593 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
596 struct edid *edid = (struct edid *)raw_edid;
601 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
602 cb(&(edid->detailed_timings[i]), closure);
604 for (i = 1; i <= raw_edid[0x7e]; i++) {
605 u8 *ext = raw_edid + (i * EDID_LENGTH);
608 cea_for_each_detailed_block(ext, cb, closure);
611 vtb_for_each_detailed_block(ext, cb, closure);
620 is_rb(struct detailed_timing *t, void *data)
623 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
625 *(bool *)data = true;
628 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
630 drm_monitor_supports_rb(struct edid *edid)
632 if (edid->revision >= 4) {
634 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
638 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
642 find_gtf2(struct detailed_timing *t, void *data)
645 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
649 /* Secondary GTF curve kicks in above some break frequency */
651 drm_gtf2_hbreak(struct edid *edid)
654 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
655 return r ? (r[12] * 2) : 0;
659 drm_gtf2_2c(struct edid *edid)
662 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
663 return r ? r[13] : 0;
667 drm_gtf2_m(struct edid *edid)
670 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
671 return r ? (r[15] << 8) + r[14] : 0;
675 drm_gtf2_k(struct edid *edid)
678 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
679 return r ? r[16] : 0;
683 drm_gtf2_2j(struct edid *edid)
686 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
687 return r ? r[17] : 0;
691 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
692 * @edid: EDID block to scan
694 static int standard_timing_level(struct edid *edid)
696 if (edid->revision >= 2) {
697 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
699 if (drm_gtf2_hbreak(edid))
707 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
708 * monitors fill with ascii space (0x20) instead.
711 bad_std_timing(u8 a, u8 b)
713 return (a == 0x00 && b == 0x00) ||
714 (a == 0x01 && b == 0x01) ||
715 (a == 0x20 && b == 0x20);
719 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
720 * @t: standard timing params
721 * @timing_level: standard timing level
723 * Take the standard timing params (in this case width, aspect, and refresh)
724 * and convert them into a real mode using CVT/GTF/DMT.
726 static struct drm_display_mode *
727 drm_mode_std(struct drm_connector *connector, struct edid *edid,
728 struct std_timing *t, int revision)
730 struct drm_device *dev = connector->dev;
731 struct drm_display_mode *m, *mode = NULL;
734 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
735 >> EDID_TIMING_ASPECT_SHIFT;
736 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
737 >> EDID_TIMING_VFREQ_SHIFT;
738 int timing_level = standard_timing_level(edid);
740 if (bad_std_timing(t->hsize, t->vfreq_aspect))
743 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
744 hsize = t->hsize * 8 + 248;
745 /* vrefresh_rate = vfreq + 60 */
746 vrefresh_rate = vfreq + 60;
747 /* the vdisplay is calculated based on the aspect ratio */
748 if (aspect_ratio == 0) {
752 vsize = (hsize * 10) / 16;
753 } else if (aspect_ratio == 1)
754 vsize = (hsize * 3) / 4;
755 else if (aspect_ratio == 2)
756 vsize = (hsize * 4) / 5;
758 vsize = (hsize * 9) / 16;
760 /* HDTV hack, part 1 */
761 if (vrefresh_rate == 60 &&
762 ((hsize == 1360 && vsize == 765) ||
763 (hsize == 1368 && vsize == 769))) {
769 * If this connector already has a mode for this size and refresh
770 * rate (because it came from detailed or CVT info), use that
771 * instead. This way we don't have to guess at interlace or
774 list_for_each_entry(m, &connector->probed_modes, head)
775 if (m->hdisplay == hsize && m->vdisplay == vsize &&
776 drm_mode_vrefresh(m) == vrefresh_rate)
779 /* HDTV hack, part 2 */
780 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
781 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
783 mode->hdisplay = 1366;
784 mode->hsync_start = mode->hsync_start - 1;
785 mode->hsync_end = mode->hsync_end - 1;
789 /* check whether it can be found in default mode table */
790 if (drm_monitor_supports_rb(edid)) {
791 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
796 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
800 /* okay, generate it */
801 switch (timing_level) {
805 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
809 * This is potentially wrong if there's ever a monitor with
810 * more than one ranges section, each claiming a different
811 * secondary GTF curve. Please don't do that.
813 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
816 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
817 drm_mode_destroy(dev, mode);
818 mode = drm_gtf_mode_complex(dev, hsize, vsize,
827 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
835 * EDID is delightfully ambiguous about how interlaced modes are to be
836 * encoded. Our internal representation is of frame height, but some
837 * HDTV detailed timings are encoded as field height.
839 * The format list here is from CEA, in frame size. Technically we
840 * should be checking refresh rate too. Whatever.
843 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
844 struct detailed_pixel_timing *pt)
847 static const struct {
849 } cea_interlaced[] = {
859 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
862 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
863 if ((mode->hdisplay == cea_interlaced[i].w) &&
864 (mode->vdisplay == cea_interlaced[i].h / 2)) {
866 mode->vsync_start *= 2;
867 mode->vsync_end *= 2;
873 mode->flags |= DRM_MODE_FLAG_INTERLACE;
877 * drm_mode_detailed - create a new mode from an EDID detailed timing section
878 * @dev: DRM device (needed to create new mode)
880 * @timing: EDID detailed timing info
881 * @quirks: quirks to apply
883 * An EDID detailed timing block contains enough info for us to create and
884 * return a new struct drm_display_mode.
886 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
888 struct detailed_timing *timing,
891 struct drm_display_mode *mode;
892 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
893 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
894 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
895 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
896 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
897 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
898 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
899 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
900 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
902 /* ignore tiny modes */
903 if (hactive < 64 || vactive < 64)
906 if (pt->misc & DRM_EDID_PT_STEREO) {
907 printk(KERN_WARNING "stereo mode not supported\n");
910 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
911 printk(KERN_WARNING "composite sync not supported\n");
914 /* it is incorrect if hsync/vsync width is zero */
915 if (!hsync_pulse_width || !vsync_pulse_width) {
916 DRM_DEBUG_KMS("Incorrect Detailed timing. "
917 "Wrong Hsync/Vsync pulse width\n");
921 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
922 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
929 mode = drm_mode_create(dev);
933 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
934 timing->pixel_clock = cpu_to_le16(1088);
936 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
938 mode->hdisplay = hactive;
939 mode->hsync_start = mode->hdisplay + hsync_offset;
940 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
941 mode->htotal = mode->hdisplay + hblank;
943 mode->vdisplay = vactive;
944 mode->vsync_start = mode->vdisplay + vsync_offset;
945 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
946 mode->vtotal = mode->vdisplay + vblank;
948 /* Some EDIDs have bogus h/vtotal values */
949 if (mode->hsync_end > mode->htotal)
950 mode->htotal = mode->hsync_end + 1;
951 if (mode->vsync_end > mode->vtotal)
952 mode->vtotal = mode->vsync_end + 1;
954 drm_mode_do_interlace_quirk(mode, pt);
956 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
957 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
960 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
961 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
962 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
963 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
966 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
967 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
969 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
970 mode->width_mm *= 10;
971 mode->height_mm *= 10;
974 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
975 mode->width_mm = edid->width_cm * 10;
976 mode->height_mm = edid->height_cm * 10;
979 mode->type = DRM_MODE_TYPE_DRIVER;
980 drm_mode_set_name(mode);
986 mode_in_hsync_range(const struct drm_display_mode *mode,
987 struct edid *edid, u8 *t)
989 int hsync, hmin, hmax;
992 if (edid->revision >= 4)
993 hmin += ((t[4] & 0x04) ? 255 : 0);
995 if (edid->revision >= 4)
996 hmax += ((t[4] & 0x08) ? 255 : 0);
997 hsync = drm_mode_hsync(mode);
999 return (hsync <= hmax && hsync >= hmin);
1003 mode_in_vsync_range(const struct drm_display_mode *mode,
1004 struct edid *edid, u8 *t)
1006 int vsync, vmin, vmax;
1009 if (edid->revision >= 4)
1010 vmin += ((t[4] & 0x01) ? 255 : 0);
1012 if (edid->revision >= 4)
1013 vmax += ((t[4] & 0x02) ? 255 : 0);
1014 vsync = drm_mode_vrefresh(mode);
1016 return (vsync <= vmax && vsync >= vmin);
1020 range_pixel_clock(struct edid *edid, u8 *t)
1023 if (t[9] == 0 || t[9] == 255)
1026 /* 1.4 with CVT support gives us real precision, yay */
1027 if (edid->revision >= 4 && t[10] == 0x04)
1028 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1030 /* 1.3 is pathetic, so fuzz up a bit */
1031 return t[9] * 10000 + 5001;
1035 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1036 struct detailed_timing *timing)
1039 u8 *t = (u8 *)timing;
1041 if (!mode_in_hsync_range(mode, edid, t))
1044 if (!mode_in_vsync_range(mode, edid, t))
1047 if ((max_clock = range_pixel_clock(edid, t)))
1048 if (mode->clock > max_clock)
1051 /* 1.4 max horizontal check */
1052 if (edid->revision >= 4 && t[10] == 0x04)
1053 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1056 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1062 static bool valid_inferred_mode(const struct drm_connector *connector,
1063 const struct drm_display_mode *mode)
1065 struct drm_display_mode *m;
1068 list_for_each_entry(m, &connector->probed_modes, head) {
1069 if (mode->hdisplay == m->hdisplay &&
1070 mode->vdisplay == m->vdisplay &&
1071 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m))
1072 return false; /* duplicated */
1073 if (mode->hdisplay <= m->hdisplay &&
1074 mode->vdisplay <= m->vdisplay)
1081 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1082 struct detailed_timing *timing)
1085 struct drm_display_mode *newmode;
1086 struct drm_device *dev = connector->dev;
1088 for (i = 0; i < drm_num_dmt_modes; i++) {
1089 if (mode_in_range(drm_dmt_modes + i, edid, timing) &&
1090 valid_inferred_mode(connector, drm_dmt_modes + i)) {
1091 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1093 drm_mode_probed_add(connector, newmode);
1102 /* fix up 1366x768 mode from 1368x768;
1103 * GFT/CVT can't express 1366 width which isn't dividable by 8
1105 static void fixup_mode_1366x768(struct drm_display_mode *mode)
1107 if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1108 mode->hdisplay = 1366;
1109 mode->hsync_start--;
1111 drm_mode_set_name(mode);
1116 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1117 struct detailed_timing *timing)
1120 struct drm_display_mode *newmode;
1121 struct drm_device *dev = connector->dev;
1123 for (i = 0; i < num_extra_modes; i++) {
1124 const struct minimode *m = &extra_modes[i];
1125 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1129 fixup_mode_1366x768(newmode);
1130 if (!mode_in_range(newmode, edid, timing) ||
1131 !valid_inferred_mode(connector, newmode)) {
1132 drm_mode_destroy(dev, newmode);
1136 drm_mode_probed_add(connector, newmode);
1144 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1145 struct detailed_timing *timing)
1148 struct drm_display_mode *newmode;
1149 struct drm_device *dev = connector->dev;
1150 bool rb = drm_monitor_supports_rb(edid);
1152 for (i = 0; i < num_extra_modes; i++) {
1153 const struct minimode *m = &extra_modes[i];
1154 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1158 fixup_mode_1366x768(newmode);
1159 if (!mode_in_range(newmode, edid, timing) ||
1160 !valid_inferred_mode(connector, newmode)) {
1161 drm_mode_destroy(dev, newmode);
1165 drm_mode_probed_add(connector, newmode);
1173 do_inferred_modes(struct detailed_timing *timing, void *c)
1175 struct detailed_mode_closure *closure = c;
1176 struct detailed_non_pixel *data = &timing->data.other_data;
1177 struct detailed_data_monitor_range *range = &data->data.range;
1179 if (data->type != EDID_DETAIL_MONITOR_RANGE)
1182 closure->modes += drm_dmt_modes_for_range(closure->connector,
1186 if (!version_greater(closure->edid, 1, 1))
1187 return; /* GTF not defined yet */
1189 switch (range->flags) {
1190 case 0x02: /* secondary gtf, XXX could do more */
1191 case 0x00: /* default gtf */
1192 closure->modes += drm_gtf_modes_for_range(closure->connector,
1196 case 0x04: /* cvt, only in 1.4+ */
1197 if (!version_greater(closure->edid, 1, 3))
1200 closure->modes += drm_cvt_modes_for_range(closure->connector,
1204 case 0x01: /* just the ranges, no formula */
1211 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1213 struct detailed_mode_closure closure = {
1214 connector, edid, 0, 0, 0
1217 if (version_greater(edid, 1, 0))
1218 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1221 return closure.modes;
1225 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1227 int i, j, m, modes = 0;
1228 struct drm_display_mode *mode;
1229 u8 *est = ((u8 *)timing) + 5;
1231 for (i = 0; i < 6; i++) {
1232 for (j = 7; j > 0; j--) {
1233 m = (i * 8) + (7 - j);
1234 if (m >= ARRAY_SIZE(est3_modes))
1236 if (est[i] & (1 << j)) {
1237 mode = drm_mode_find_dmt(connector->dev,
1243 drm_mode_probed_add(connector, mode);
1254 do_established_modes(struct detailed_timing *timing, void *c)
1256 struct detailed_mode_closure *closure = c;
1257 struct detailed_non_pixel *data = &timing->data.other_data;
1259 if (data->type == EDID_DETAIL_EST_TIMINGS)
1260 closure->modes += drm_est3_modes(closure->connector, timing);
1264 * add_established_modes - get est. modes from EDID and add them
1265 * @edid: EDID block to scan
1267 * Each EDID block contains a bitmap of the supported "established modes" list
1268 * (defined above). Tease them out and add them to the global modes list.
1271 add_established_modes(struct drm_connector *connector, struct edid *edid)
1273 struct drm_device *dev = connector->dev;
1274 unsigned long est_bits = edid->established_timings.t1 |
1275 (edid->established_timings.t2 << 8) |
1276 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1278 struct detailed_mode_closure closure = {
1279 connector, edid, 0, 0, 0
1282 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1283 if (est_bits & (1<<i)) {
1284 struct drm_display_mode *newmode;
1285 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1287 drm_mode_probed_add(connector, newmode);
1293 if (version_greater(edid, 1, 0))
1294 drm_for_each_detailed_block((u8 *)edid,
1295 do_established_modes, &closure);
1297 return modes + closure.modes;
1301 do_standard_modes(struct detailed_timing *timing, void *c)
1303 struct detailed_mode_closure *closure = c;
1304 struct detailed_non_pixel *data = &timing->data.other_data;
1305 struct drm_connector *connector = closure->connector;
1306 struct edid *edid = closure->edid;
1308 if (data->type == EDID_DETAIL_STD_MODES) {
1310 for (i = 0; i < 6; i++) {
1311 struct std_timing *std;
1312 struct drm_display_mode *newmode;
1314 std = &data->data.timings[i];
1315 newmode = drm_mode_std(connector, edid, std,
1318 drm_mode_probed_add(connector, newmode);
1326 * add_standard_modes - get std. modes from EDID and add them
1327 * @edid: EDID block to scan
1329 * Standard modes can be calculated using the appropriate standard (DMT,
1330 * GTF or CVT. Grab them from @edid and add them to the list.
1333 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1336 struct detailed_mode_closure closure = {
1337 connector, edid, 0, 0, 0
1340 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1341 struct drm_display_mode *newmode;
1343 newmode = drm_mode_std(connector, edid,
1344 &edid->standard_timings[i],
1347 drm_mode_probed_add(connector, newmode);
1352 if (version_greater(edid, 1, 0))
1353 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1356 /* XXX should also look for standard codes in VTB blocks */
1358 return modes + closure.modes;
1361 static int drm_cvt_modes(struct drm_connector *connector,
1362 struct detailed_timing *timing)
1364 int i, j, modes = 0;
1365 struct drm_display_mode *newmode;
1366 struct drm_device *dev = connector->dev;
1367 struct cvt_timing *cvt;
1368 const int rates[] = { 60, 85, 75, 60, 50 };
1369 const u8 empty[3] = { 0, 0, 0 };
1371 for (i = 0; i < 4; i++) {
1372 int uninitialized_var(width), height;
1373 cvt = &(timing->data.other_data.data.cvt[i]);
1375 if (!memcmp(cvt->code, empty, 3))
1378 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1379 switch (cvt->code[1] & 0x0c) {
1381 width = height * 4 / 3;
1384 width = height * 16 / 9;
1387 width = height * 16 / 10;
1390 width = height * 15 / 9;
1394 for (j = 1; j < 5; j++) {
1395 if (cvt->code[2] & (1 << j)) {
1396 newmode = drm_cvt_mode(dev, width, height,
1400 drm_mode_probed_add(connector, newmode);
1411 do_cvt_mode(struct detailed_timing *timing, void *c)
1413 struct detailed_mode_closure *closure = c;
1414 struct detailed_non_pixel *data = &timing->data.other_data;
1416 if (data->type == EDID_DETAIL_CVT_3BYTE)
1417 closure->modes += drm_cvt_modes(closure->connector, timing);
1421 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1423 struct detailed_mode_closure closure = {
1424 connector, edid, 0, 0, 0
1427 if (version_greater(edid, 1, 2))
1428 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1430 /* XXX should also look for CVT codes in VTB blocks */
1432 return closure.modes;
1436 do_detailed_mode(struct detailed_timing *timing, void *c)
1438 struct detailed_mode_closure *closure = c;
1439 struct drm_display_mode *newmode;
1441 if (timing->pixel_clock) {
1442 newmode = drm_mode_detailed(closure->connector->dev,
1443 closure->edid, timing,
1448 if (closure->preferred)
1449 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1451 drm_mode_probed_add(closure->connector, newmode);
1453 closure->preferred = 0;
1458 * add_detailed_modes - Add modes from detailed timings
1459 * @connector: attached connector
1460 * @edid: EDID block to scan
1461 * @quirks: quirks to apply
1464 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1467 struct detailed_mode_closure closure = {
1475 if (closure.preferred && !version_greater(edid, 1, 3))
1477 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1479 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1481 return closure.modes;
1484 #define HDMI_IDENTIFIER 0x000C03
1485 #define AUDIO_BLOCK 0x01
1486 #define VIDEO_BLOCK 0x02
1487 #define VENDOR_BLOCK 0x03
1488 #define SPEAKER_BLOCK 0x04
1489 #define EDID_BASIC_AUDIO (1 << 6)
1490 #define EDID_CEA_YCRCB444 (1 << 5)
1491 #define EDID_CEA_YCRCB422 (1 << 4)
1494 * Search EDID for CEA extension block.
1496 u8 *drm_find_cea_extension(struct edid *edid)
1498 u8 *edid_ext = NULL;
1501 /* No EDID or EDID extensions */
1502 if (edid == NULL || edid->extensions == 0)
1505 /* Find CEA extension */
1506 for (i = 0; i < edid->extensions; i++) {
1507 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1508 if (edid_ext[0] == CEA_EXT)
1512 if (i == edid->extensions)
1517 EXPORT_SYMBOL(drm_find_cea_extension);
1520 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1522 struct drm_device *dev = connector->dev;
1523 u8 * mode, cea_mode;
1526 for (mode = db; mode < db + len; mode++) {
1527 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1528 if (cea_mode < drm_num_cea_modes) {
1529 struct drm_display_mode *newmode;
1530 newmode = drm_mode_duplicate(dev,
1531 &edid_cea_modes[cea_mode]);
1533 drm_mode_probed_add(connector, newmode);
1543 cea_db_payload_len(const u8 *db)
1545 return db[0] & 0x1f;
1549 cea_db_tag(const u8 *db)
1555 cea_revision(const u8 *cea)
1561 cea_db_offsets(const u8 *cea, int *start, int *end)
1563 /* Data block offset in CEA extension block */
1568 if (*end < 4 || *end > 127)
1573 #define for_each_cea_db(cea, i, start, end) \
1574 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
1577 add_cea_modes(struct drm_connector *connector, struct edid *edid)
1579 u8 * cea = drm_find_cea_extension(edid);
1583 if (cea && cea_revision(cea) >= 3) {
1586 if (cea_db_offsets(cea, &start, &end))
1589 for_each_cea_db(cea, i, start, end) {
1591 dbl = cea_db_payload_len(db);
1593 if (cea_db_tag(db) == VIDEO_BLOCK)
1594 modes += do_cea_modes (connector, db+1, dbl);
1602 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db)
1604 u8 len = cea_db_payload_len(db);
1607 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1608 connector->dvi_dual = db[6] & 1;
1611 connector->max_tmds_clock = db[7] * 5;
1613 connector->latency_present[0] = db[8] >> 7;
1614 connector->latency_present[1] = (db[8] >> 6) & 1;
1617 connector->video_latency[0] = db[9];
1619 connector->audio_latency[0] = db[10];
1621 connector->video_latency[1] = db[11];
1623 connector->audio_latency[1] = db[12];
1625 DRM_LOG_KMS("HDMI: DVI dual %d, "
1626 "max TMDS clock %d, "
1627 "latency present %d %d, "
1628 "video latency %d %d, "
1629 "audio latency %d %d\n",
1630 connector->dvi_dual,
1631 connector->max_tmds_clock,
1632 (int) connector->latency_present[0],
1633 (int) connector->latency_present[1],
1634 connector->video_latency[0],
1635 connector->video_latency[1],
1636 connector->audio_latency[0],
1637 connector->audio_latency[1]);
1641 monitor_name(struct detailed_timing *t, void *data)
1643 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1644 *(u8 **)data = t->data.other_data.data.str.str;
1647 static bool cea_db_is_hdmi_vsdb(const u8 *db)
1651 if (cea_db_tag(db) != VENDOR_BLOCK)
1654 if (cea_db_payload_len(db) < 5)
1657 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16);
1659 return hdmi_id == HDMI_IDENTIFIER;
1663 * drm_edid_to_eld - build ELD from EDID
1664 * @connector: connector corresponding to the HDMI/DP sink
1665 * @edid: EDID to parse
1667 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1668 * Some ELD fields are left to the graphics driver caller:
1673 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1675 uint8_t *eld = connector->eld;
1683 memset(eld, 0, sizeof(connector->eld));
1685 cea = drm_find_cea_extension(edid);
1687 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1692 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1693 for (mnl = 0; name && mnl < 13; mnl++) {
1694 if (name[mnl] == 0x0a)
1696 eld[20 + mnl] = name[mnl];
1698 eld[4] = (cea[1] << 5) | mnl;
1699 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1701 eld[0] = 2 << 3; /* ELD version: 2 */
1703 eld[16] = edid->mfg_id[0];
1704 eld[17] = edid->mfg_id[1];
1705 eld[18] = edid->prod_code[0];
1706 eld[19] = edid->prod_code[1];
1708 if (cea_revision(cea) >= 3) {
1711 if (cea_db_offsets(cea, &start, &end)) {
1716 for_each_cea_db(cea, i, start, end) {
1718 dbl = cea_db_payload_len(db);
1720 switch (cea_db_tag(db)) {
1722 /* Audio Data Block, contains SADs */
1723 sad_count = dbl / 3;
1725 memcpy(eld + 20 + mnl, &db[1], dbl);
1728 /* Speaker Allocation Data Block */
1733 /* HDMI Vendor-Specific Data Block */
1734 if (cea_db_is_hdmi_vsdb(db))
1735 parse_hdmi_vsdb(connector, db);
1742 eld[5] |= sad_count << 4;
1743 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1745 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1747 EXPORT_SYMBOL(drm_edid_to_eld);
1750 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1751 * @connector: connector associated with the HDMI/DP sink
1752 * @mode: the display mode
1754 int drm_av_sync_delay(struct drm_connector *connector,
1755 struct drm_display_mode *mode)
1757 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1760 if (!connector->latency_present[0])
1762 if (!connector->latency_present[1])
1765 a = connector->audio_latency[i];
1766 v = connector->video_latency[i];
1769 * HDMI/DP sink doesn't support audio or video?
1771 if (a == 255 || v == 255)
1775 * Convert raw EDID values to millisecond.
1776 * Treat unknown latency as 0ms.
1779 a = min(2 * (a - 1), 500);
1781 v = min(2 * (v - 1), 500);
1783 return max(v - a, 0);
1785 EXPORT_SYMBOL(drm_av_sync_delay);
1788 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1789 * @encoder: the encoder just changed display mode
1790 * @mode: the adjusted display mode
1792 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1793 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1795 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1796 struct drm_display_mode *mode)
1798 struct drm_connector *connector;
1799 struct drm_device *dev = encoder->dev;
1801 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1802 if (connector->encoder == encoder && connector->eld[0])
1807 EXPORT_SYMBOL(drm_select_eld);
1810 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1811 * @edid: monitor EDID information
1813 * Parse the CEA extension according to CEA-861-B.
1814 * Return true if HDMI, false if not or unknown.
1816 bool drm_detect_hdmi_monitor(struct edid *edid)
1820 int start_offset, end_offset;
1822 edid_ext = drm_find_cea_extension(edid);
1826 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1830 * Because HDMI identifier is in Vendor Specific Block,
1831 * search it from all data blocks of CEA extension.
1833 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1834 if (cea_db_is_hdmi_vsdb(&edid_ext[i]))
1840 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1843 * drm_detect_monitor_audio - check monitor audio capability
1845 * Monitor should have CEA extension block.
1846 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1847 * audio' only. If there is any audio extension block and supported
1848 * audio format, assume at least 'basic audio' support, even if 'basic
1849 * audio' is not defined in EDID.
1852 bool drm_detect_monitor_audio(struct edid *edid)
1856 bool has_audio = false;
1857 int start_offset, end_offset;
1859 edid_ext = drm_find_cea_extension(edid);
1863 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1866 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1870 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1873 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1874 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) {
1876 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3)
1877 DRM_DEBUG_KMS("CEA audio format %d\n",
1878 (edid_ext[i + j] >> 3) & 0xf);
1885 EXPORT_SYMBOL(drm_detect_monitor_audio);
1888 * drm_add_display_info - pull display info out if present
1890 * @info: display info (attached to connector)
1892 * Grab any available display info and stuff it into the drm_display_info
1893 * structure that's part of the connector. Useful for tracking bpp and
1896 static void drm_add_display_info(struct edid *edid,
1897 struct drm_display_info *info)
1901 info->width_mm = edid->width_cm * 10;
1902 info->height_mm = edid->height_cm * 10;
1904 /* driver figures it out in this case */
1906 info->color_formats = 0;
1908 if (edid->revision < 3)
1911 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1914 /* Get data from CEA blocks if present */
1915 edid_ext = drm_find_cea_extension(edid);
1917 info->cea_rev = edid_ext[1];
1919 /* The existence of a CEA block should imply RGB support */
1920 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1921 if (edid_ext[3] & EDID_CEA_YCRCB444)
1922 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1923 if (edid_ext[3] & EDID_CEA_YCRCB422)
1924 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1927 /* Only defined for 1.4 with digital displays */
1928 if (edid->revision < 4)
1931 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1932 case DRM_EDID_DIGITAL_DEPTH_6:
1935 case DRM_EDID_DIGITAL_DEPTH_8:
1938 case DRM_EDID_DIGITAL_DEPTH_10:
1941 case DRM_EDID_DIGITAL_DEPTH_12:
1944 case DRM_EDID_DIGITAL_DEPTH_14:
1947 case DRM_EDID_DIGITAL_DEPTH_16:
1950 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1956 info->color_formats |= DRM_COLOR_FORMAT_RGB444;
1957 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
1958 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1959 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
1960 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1964 * drm_add_edid_modes - add modes from EDID data, if available
1965 * @connector: connector we're probing
1968 * Add the specified modes to the connector's mode list.
1970 * Return number of modes added or 0 if we couldn't find any.
1972 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1980 if (!drm_edid_is_valid(edid)) {
1981 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1982 drm_get_connector_name(connector));
1986 quirks = edid_get_quirks(edid);
1989 * EDID spec says modes should be preferred in this order:
1990 * - preferred detailed mode
1991 * - other detailed modes from base block
1992 * - detailed modes from extension blocks
1993 * - CVT 3-byte code modes
1994 * - standard timing codes
1995 * - established timing codes
1996 * - modes inferred from GTF or CVT range information
1998 * We get this pretty much right.
2000 * XXX order for additional mode types in extension blocks?
2002 num_modes += add_detailed_modes(connector, edid, quirks);
2003 num_modes += add_cvt_modes(connector, edid);
2004 num_modes += add_standard_modes(connector, edid);
2005 num_modes += add_established_modes(connector, edid);
2006 num_modes += add_inferred_modes(connector, edid);
2007 num_modes += add_cea_modes(connector, edid);
2009 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
2010 edid_fixup_preferred(connector, quirks);
2012 drm_add_display_info(edid, &connector->display_info);
2016 EXPORT_SYMBOL(drm_add_edid_modes);
2019 * drm_add_modes_noedid - add modes for the connectors without EDID
2020 * @connector: connector we're probing
2021 * @hdisplay: the horizontal display limit
2022 * @vdisplay: the vertical display limit
2024 * Add the specified modes to the connector's mode list. Only when the
2025 * hdisplay/vdisplay is not beyond the given limit, it will be added.
2027 * Return number of modes added or 0 if we couldn't find any.
2029 int drm_add_modes_noedid(struct drm_connector *connector,
2030 int hdisplay, int vdisplay)
2032 int i, count, num_modes = 0;
2033 struct drm_display_mode *mode;
2034 struct drm_device *dev = connector->dev;
2036 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
2042 for (i = 0; i < count; i++) {
2043 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
2044 if (hdisplay && vdisplay) {
2046 * Only when two are valid, they will be used to check
2047 * whether the mode should be added to the mode list of
2050 if (ptr->hdisplay > hdisplay ||
2051 ptr->vdisplay > vdisplay)
2054 if (drm_mode_vrefresh(ptr) > 61)
2056 mode = drm_mode_duplicate(dev, ptr);
2058 drm_mode_probed_add(connector, mode);
2064 EXPORT_SYMBOL(drm_add_modes_noedid);