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 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
93 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
95 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
97 /* Belinea 10 15 55 */
98 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
99 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
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 },
106 /* Funai Electronics PM36B */
107 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
108 EDID_QUIRK_DETAILED_IN_CM },
110 /* LG Philips LCD LP154W01-A5 */
111 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
112 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
114 /* Philips 107p5 CRT */
115 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
118 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
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 },
126 /* ViewSonic VA2026w */
127 { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
130 /*** DDC fetch and block validation ***/
132 static const u8 edid_header[] = {
133 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
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.
140 int drm_edid_header_is_valid(const u8 *raw_edid)
144 for (i = 0; i < sizeof(edid_header); i++)
145 if (raw_edid[i] == edid_header[i])
150 EXPORT_SYMBOL(drm_edid_header_is_valid);
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)");
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.
161 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
165 struct edid *edid = (struct edid *)raw_edid;
167 if (edid_fixup > 8 || edid_fixup < 0)
171 int score = drm_edid_header_is_valid(raw_edid);
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));
181 for (i = 0; i < EDID_LENGTH; i++)
184 if (print_bad_edid) {
185 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
188 /* allow CEA to slide through, switches mangle this */
189 if (raw_edid[0] != 0x02)
193 /* per-block-type checks */
194 switch (raw_edid[0]) {
196 if (edid->version != 1) {
197 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
201 if (edid->revision > 4)
202 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
212 if (raw_edid && print_bad_edid) {
213 printk(KERN_ERR "Raw EDID:\n");
214 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
215 raw_edid, EDID_LENGTH, false);
219 EXPORT_SYMBOL(drm_edid_block_valid);
222 * drm_edid_is_valid - sanity check EDID data
225 * Sanity-check an entire EDID record (including extensions)
227 bool drm_edid_is_valid(struct edid *edid)
230 u8 *raw = (u8 *)edid;
235 for (i = 0; i <= edid->extensions; i++)
236 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true))
241 EXPORT_SYMBOL(drm_edid_is_valid);
243 #define DDC_SEGMENT_ADDR 0x30
245 * Get EDID information via I2C.
247 * \param adapter : i2c device adaptor
248 * \param buf : EDID data buffer to be filled
249 * \param len : EDID data buffer length
250 * \return 0 on success or -1 on failure.
252 * Try to fetch EDID information by calling i2c driver function.
255 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
258 unsigned char start = block * EDID_LENGTH;
259 unsigned char segment = block >> 1;
260 unsigned char xfers = segment ? 3 : 2;
261 int ret, retries = 5;
263 /* The core i2c driver will automatically retry the transfer if the
264 * adapter reports EAGAIN. However, we find that bit-banging transfers
265 * are susceptible to errors under a heavily loaded machine and
266 * generate spurious NAKs and timeouts. Retrying the transfer
267 * of the individual block a few times seems to overcome this.
270 struct i2c_msg msgs[] = {
272 .addr = DDC_SEGMENT_ADDR,
290 * Avoid sending the segment addr to not upset non-compliant ddc
293 ret = i2c_transfer(adapter, &msgs[3 - xfers], xfers);
296 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
300 } while (ret != xfers && --retries);
302 return ret == xfers ? 0 : -1;
305 static bool drm_edid_is_zero(u8 *in_edid, int length)
307 if (memchr_inv(in_edid, 0, length))
314 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
316 int i, j = 0, valid_extensions = 0;
318 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
320 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
323 /* base block fetch */
324 for (i = 0; i < 4; i++) {
325 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
327 if (drm_edid_block_valid(block, 0, print_bad_edid))
329 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
330 connector->null_edid_counter++;
337 /* if there's no extensions, we're done */
338 if (block[0x7e] == 0)
341 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
346 for (j = 1; j <= block[0x7e]; j++) {
347 for (i = 0; i < 4; i++) {
348 if (drm_do_probe_ddc_edid(adapter,
349 block + (valid_extensions + 1) * EDID_LENGTH,
352 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) {
358 if (i == 4 && print_bad_edid) {
359 dev_warn(connector->dev->dev,
360 "%s: Ignoring invalid EDID block %d.\n",
361 drm_get_connector_name(connector), j);
363 connector->bad_edid_counter++;
367 if (valid_extensions != block[0x7e]) {
368 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
369 block[0x7e] = valid_extensions;
370 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
379 if (print_bad_edid) {
380 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
381 drm_get_connector_name(connector), j);
383 connector->bad_edid_counter++;
391 * Probe DDC presence.
393 * \param adapter : i2c device adaptor
394 * \return 1 on success
397 drm_probe_ddc(struct i2c_adapter *adapter)
401 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
403 EXPORT_SYMBOL(drm_probe_ddc);
406 * drm_get_edid - get EDID data, if available
407 * @connector: connector we're probing
408 * @adapter: i2c adapter to use for DDC
410 * Poke the given i2c channel to grab EDID data if possible. If found,
411 * attach it to the connector.
413 * Return edid data or NULL if we couldn't find any.
415 struct edid *drm_get_edid(struct drm_connector *connector,
416 struct i2c_adapter *adapter)
418 struct edid *edid = NULL;
420 if (drm_probe_ddc(adapter))
421 edid = (struct edid *)drm_do_get_edid(connector, adapter);
425 EXPORT_SYMBOL(drm_get_edid);
427 /*** EDID parsing ***/
430 * edid_vendor - match a string against EDID's obfuscated vendor field
431 * @edid: EDID to match
432 * @vendor: vendor string
434 * Returns true if @vendor is in @edid, false otherwise
436 static bool edid_vendor(struct edid *edid, char *vendor)
440 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
441 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
442 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
443 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
445 return !strncmp(edid_vendor, vendor, 3);
449 * edid_get_quirks - return quirk flags for a given EDID
450 * @edid: EDID to process
452 * This tells subsequent routines what fixes they need to apply.
454 static u32 edid_get_quirks(struct edid *edid)
456 struct edid_quirk *quirk;
459 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
460 quirk = &edid_quirk_list[i];
462 if (edid_vendor(edid, quirk->vendor) &&
463 (EDID_PRODUCT_ID(edid) == quirk->product_id))
464 return quirk->quirks;
470 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
471 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
474 * edid_fixup_preferred - set preferred modes based on quirk list
475 * @connector: has mode list to fix up
476 * @quirks: quirks list
478 * Walk the mode list for @connector, clearing the preferred status
479 * on existing modes and setting it anew for the right mode ala @quirks.
481 static void edid_fixup_preferred(struct drm_connector *connector,
484 struct drm_display_mode *t, *cur_mode, *preferred_mode;
485 int target_refresh = 0;
487 if (list_empty(&connector->probed_modes))
490 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
492 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
495 preferred_mode = list_first_entry(&connector->probed_modes,
496 struct drm_display_mode, head);
498 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
499 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
501 if (cur_mode == preferred_mode)
504 /* Largest mode is preferred */
505 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
506 preferred_mode = cur_mode;
508 /* At a given size, try to get closest to target refresh */
509 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
510 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
511 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
512 preferred_mode = cur_mode;
516 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
520 mode_is_rb(const struct drm_display_mode *mode)
522 return (mode->htotal - mode->hdisplay == 160) &&
523 (mode->hsync_end - mode->hdisplay == 80) &&
524 (mode->hsync_end - mode->hsync_start == 32) &&
525 (mode->vsync_start - mode->vdisplay == 3);
529 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
530 * @dev: Device to duplicate against
532 * @vsize: Mode height
533 * @fresh: Mode refresh rate
534 * @rb: Mode reduced-blanking-ness
536 * Walk the DMT mode list looking for a match for the given parameters.
537 * Return a newly allocated copy of the mode, or NULL if not found.
539 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
540 int hsize, int vsize, int fresh,
545 for (i = 0; i < drm_num_dmt_modes; i++) {
546 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
547 if (hsize != ptr->hdisplay)
549 if (vsize != ptr->vdisplay)
551 if (fresh != drm_mode_vrefresh(ptr))
553 if (rb != mode_is_rb(ptr))
556 return drm_mode_duplicate(dev, ptr);
561 EXPORT_SYMBOL(drm_mode_find_dmt);
563 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
566 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
570 u8 *det_base = ext + d;
573 for (i = 0; i < n; i++)
574 cb((struct detailed_timing *)(det_base + 18 * i), closure);
578 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
580 unsigned int i, n = min((int)ext[0x02], 6);
581 u8 *det_base = ext + 5;
584 return; /* unknown version */
586 for (i = 0; i < n; i++)
587 cb((struct detailed_timing *)(det_base + 18 * i), closure);
591 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
594 struct edid *edid = (struct edid *)raw_edid;
599 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
600 cb(&(edid->detailed_timings[i]), closure);
602 for (i = 1; i <= raw_edid[0x7e]; i++) {
603 u8 *ext = raw_edid + (i * EDID_LENGTH);
606 cea_for_each_detailed_block(ext, cb, closure);
609 vtb_for_each_detailed_block(ext, cb, closure);
618 is_rb(struct detailed_timing *t, void *data)
621 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
623 *(bool *)data = true;
626 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
628 drm_monitor_supports_rb(struct edid *edid)
630 if (edid->revision >= 4) {
632 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
636 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
640 find_gtf2(struct detailed_timing *t, void *data)
643 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
647 /* Secondary GTF curve kicks in above some break frequency */
649 drm_gtf2_hbreak(struct edid *edid)
652 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
653 return r ? (r[12] * 2) : 0;
657 drm_gtf2_2c(struct edid *edid)
660 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
661 return r ? r[13] : 0;
665 drm_gtf2_m(struct edid *edid)
668 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
669 return r ? (r[15] << 8) + r[14] : 0;
673 drm_gtf2_k(struct edid *edid)
676 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
677 return r ? r[16] : 0;
681 drm_gtf2_2j(struct edid *edid)
684 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
685 return r ? r[17] : 0;
689 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
690 * @edid: EDID block to scan
692 static int standard_timing_level(struct edid *edid)
694 if (edid->revision >= 2) {
695 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
697 if (drm_gtf2_hbreak(edid))
705 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
706 * monitors fill with ascii space (0x20) instead.
709 bad_std_timing(u8 a, u8 b)
711 return (a == 0x00 && b == 0x00) ||
712 (a == 0x01 && b == 0x01) ||
713 (a == 0x20 && b == 0x20);
717 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
718 * @t: standard timing params
719 * @timing_level: standard timing level
721 * Take the standard timing params (in this case width, aspect, and refresh)
722 * and convert them into a real mode using CVT/GTF/DMT.
724 static struct drm_display_mode *
725 drm_mode_std(struct drm_connector *connector, struct edid *edid,
726 struct std_timing *t, int revision)
728 struct drm_device *dev = connector->dev;
729 struct drm_display_mode *m, *mode = NULL;
732 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
733 >> EDID_TIMING_ASPECT_SHIFT;
734 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
735 >> EDID_TIMING_VFREQ_SHIFT;
736 int timing_level = standard_timing_level(edid);
738 if (bad_std_timing(t->hsize, t->vfreq_aspect))
741 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
742 hsize = t->hsize * 8 + 248;
743 /* vrefresh_rate = vfreq + 60 */
744 vrefresh_rate = vfreq + 60;
745 /* the vdisplay is calculated based on the aspect ratio */
746 if (aspect_ratio == 0) {
750 vsize = (hsize * 10) / 16;
751 } else if (aspect_ratio == 1)
752 vsize = (hsize * 3) / 4;
753 else if (aspect_ratio == 2)
754 vsize = (hsize * 4) / 5;
756 vsize = (hsize * 9) / 16;
758 /* HDTV hack, part 1 */
759 if (vrefresh_rate == 60 &&
760 ((hsize == 1360 && vsize == 765) ||
761 (hsize == 1368 && vsize == 769))) {
767 * If this connector already has a mode for this size and refresh
768 * rate (because it came from detailed or CVT info), use that
769 * instead. This way we don't have to guess at interlace or
772 list_for_each_entry(m, &connector->probed_modes, head)
773 if (m->hdisplay == hsize && m->vdisplay == vsize &&
774 drm_mode_vrefresh(m) == vrefresh_rate)
777 /* HDTV hack, part 2 */
778 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
779 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
781 mode->hdisplay = 1366;
782 mode->hsync_start = mode->hsync_start - 1;
783 mode->hsync_end = mode->hsync_end - 1;
787 /* check whether it can be found in default mode table */
788 if (drm_monitor_supports_rb(edid)) {
789 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
794 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
798 /* okay, generate it */
799 switch (timing_level) {
803 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
807 * This is potentially wrong if there's ever a monitor with
808 * more than one ranges section, each claiming a different
809 * secondary GTF curve. Please don't do that.
811 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
814 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
815 drm_mode_destroy(dev, mode);
816 mode = drm_gtf_mode_complex(dev, hsize, vsize,
825 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
833 * EDID is delightfully ambiguous about how interlaced modes are to be
834 * encoded. Our internal representation is of frame height, but some
835 * HDTV detailed timings are encoded as field height.
837 * The format list here is from CEA, in frame size. Technically we
838 * should be checking refresh rate too. Whatever.
841 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
842 struct detailed_pixel_timing *pt)
845 static const struct {
847 } cea_interlaced[] = {
857 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
860 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
861 if ((mode->hdisplay == cea_interlaced[i].w) &&
862 (mode->vdisplay == cea_interlaced[i].h / 2)) {
864 mode->vsync_start *= 2;
865 mode->vsync_end *= 2;
871 mode->flags |= DRM_MODE_FLAG_INTERLACE;
875 * drm_mode_detailed - create a new mode from an EDID detailed timing section
876 * @dev: DRM device (needed to create new mode)
878 * @timing: EDID detailed timing info
879 * @quirks: quirks to apply
881 * An EDID detailed timing block contains enough info for us to create and
882 * return a new struct drm_display_mode.
884 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
886 struct detailed_timing *timing,
889 struct drm_display_mode *mode;
890 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
891 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
892 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
893 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
894 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
895 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
896 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
897 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
898 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
900 /* ignore tiny modes */
901 if (hactive < 64 || vactive < 64)
904 if (pt->misc & DRM_EDID_PT_STEREO) {
905 printk(KERN_WARNING "stereo mode not supported\n");
908 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
909 printk(KERN_WARNING "composite sync not supported\n");
912 /* it is incorrect if hsync/vsync width is zero */
913 if (!hsync_pulse_width || !vsync_pulse_width) {
914 DRM_DEBUG_KMS("Incorrect Detailed timing. "
915 "Wrong Hsync/Vsync pulse width\n");
919 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
920 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
927 mode = drm_mode_create(dev);
931 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
932 timing->pixel_clock = cpu_to_le16(1088);
934 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
936 mode->hdisplay = hactive;
937 mode->hsync_start = mode->hdisplay + hsync_offset;
938 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
939 mode->htotal = mode->hdisplay + hblank;
941 mode->vdisplay = vactive;
942 mode->vsync_start = mode->vdisplay + vsync_offset;
943 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
944 mode->vtotal = mode->vdisplay + vblank;
946 /* Some EDIDs have bogus h/vtotal values */
947 if (mode->hsync_end > mode->htotal)
948 mode->htotal = mode->hsync_end + 1;
949 if (mode->vsync_end > mode->vtotal)
950 mode->vtotal = mode->vsync_end + 1;
952 drm_mode_do_interlace_quirk(mode, pt);
954 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
955 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
958 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
959 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
960 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
961 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
964 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
965 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
967 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
968 mode->width_mm *= 10;
969 mode->height_mm *= 10;
972 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
973 mode->width_mm = edid->width_cm * 10;
974 mode->height_mm = edid->height_cm * 10;
977 mode->type = DRM_MODE_TYPE_DRIVER;
978 drm_mode_set_name(mode);
984 mode_in_hsync_range(const struct drm_display_mode *mode,
985 struct edid *edid, u8 *t)
987 int hsync, hmin, hmax;
990 if (edid->revision >= 4)
991 hmin += ((t[4] & 0x04) ? 255 : 0);
993 if (edid->revision >= 4)
994 hmax += ((t[4] & 0x08) ? 255 : 0);
995 hsync = drm_mode_hsync(mode);
997 return (hsync <= hmax && hsync >= hmin);
1001 mode_in_vsync_range(const struct drm_display_mode *mode,
1002 struct edid *edid, u8 *t)
1004 int vsync, vmin, vmax;
1007 if (edid->revision >= 4)
1008 vmin += ((t[4] & 0x01) ? 255 : 0);
1010 if (edid->revision >= 4)
1011 vmax += ((t[4] & 0x02) ? 255 : 0);
1012 vsync = drm_mode_vrefresh(mode);
1014 return (vsync <= vmax && vsync >= vmin);
1018 range_pixel_clock(struct edid *edid, u8 *t)
1021 if (t[9] == 0 || t[9] == 255)
1024 /* 1.4 with CVT support gives us real precision, yay */
1025 if (edid->revision >= 4 && t[10] == 0x04)
1026 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1028 /* 1.3 is pathetic, so fuzz up a bit */
1029 return t[9] * 10000 + 5001;
1033 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1034 struct detailed_timing *timing)
1037 u8 *t = (u8 *)timing;
1039 if (!mode_in_hsync_range(mode, edid, t))
1042 if (!mode_in_vsync_range(mode, edid, t))
1045 if ((max_clock = range_pixel_clock(edid, t)))
1046 if (mode->clock > max_clock)
1049 /* 1.4 max horizontal check */
1050 if (edid->revision >= 4 && t[10] == 0x04)
1051 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1054 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1060 static bool valid_inferred_mode(const struct drm_connector *connector,
1061 const struct drm_display_mode *mode)
1063 struct drm_display_mode *m;
1066 list_for_each_entry(m, &connector->probed_modes, head) {
1067 if (mode->hdisplay == m->hdisplay &&
1068 mode->vdisplay == m->vdisplay &&
1069 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m))
1070 return false; /* duplicated */
1071 if (mode->hdisplay <= m->hdisplay &&
1072 mode->vdisplay <= m->vdisplay)
1079 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1080 struct detailed_timing *timing)
1083 struct drm_display_mode *newmode;
1084 struct drm_device *dev = connector->dev;
1086 for (i = 0; i < drm_num_dmt_modes; i++) {
1087 if (mode_in_range(drm_dmt_modes + i, edid, timing) &&
1088 valid_inferred_mode(connector, drm_dmt_modes + i)) {
1089 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1091 drm_mode_probed_add(connector, newmode);
1100 /* fix up 1366x768 mode from 1368x768;
1101 * GFT/CVT can't express 1366 width which isn't dividable by 8
1103 static void fixup_mode_1366x768(struct drm_display_mode *mode)
1105 if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1106 mode->hdisplay = 1366;
1107 mode->hsync_start--;
1109 drm_mode_set_name(mode);
1114 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1115 struct detailed_timing *timing)
1118 struct drm_display_mode *newmode;
1119 struct drm_device *dev = connector->dev;
1121 for (i = 0; i < num_extra_modes; i++) {
1122 const struct minimode *m = &extra_modes[i];
1123 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1127 fixup_mode_1366x768(newmode);
1128 if (!mode_in_range(newmode, edid, timing) ||
1129 !valid_inferred_mode(connector, newmode)) {
1130 drm_mode_destroy(dev, newmode);
1134 drm_mode_probed_add(connector, newmode);
1142 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1143 struct detailed_timing *timing)
1146 struct drm_display_mode *newmode;
1147 struct drm_device *dev = connector->dev;
1148 bool rb = drm_monitor_supports_rb(edid);
1150 for (i = 0; i < num_extra_modes; i++) {
1151 const struct minimode *m = &extra_modes[i];
1152 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1156 fixup_mode_1366x768(newmode);
1157 if (!mode_in_range(newmode, edid, timing) ||
1158 !valid_inferred_mode(connector, newmode)) {
1159 drm_mode_destroy(dev, newmode);
1163 drm_mode_probed_add(connector, newmode);
1171 do_inferred_modes(struct detailed_timing *timing, void *c)
1173 struct detailed_mode_closure *closure = c;
1174 struct detailed_non_pixel *data = &timing->data.other_data;
1175 struct detailed_data_monitor_range *range = &data->data.range;
1177 if (data->type != EDID_DETAIL_MONITOR_RANGE)
1180 closure->modes += drm_dmt_modes_for_range(closure->connector,
1184 if (!version_greater(closure->edid, 1, 1))
1185 return; /* GTF not defined yet */
1187 switch (range->flags) {
1188 case 0x02: /* secondary gtf, XXX could do more */
1189 case 0x00: /* default gtf */
1190 closure->modes += drm_gtf_modes_for_range(closure->connector,
1194 case 0x04: /* cvt, only in 1.4+ */
1195 if (!version_greater(closure->edid, 1, 3))
1198 closure->modes += drm_cvt_modes_for_range(closure->connector,
1202 case 0x01: /* just the ranges, no formula */
1209 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1211 struct detailed_mode_closure closure = {
1212 connector, edid, 0, 0, 0
1215 if (version_greater(edid, 1, 0))
1216 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1219 return closure.modes;
1223 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1225 int i, j, m, modes = 0;
1226 struct drm_display_mode *mode;
1227 u8 *est = ((u8 *)timing) + 5;
1229 for (i = 0; i < 6; i++) {
1230 for (j = 7; j > 0; j--) {
1231 m = (i * 8) + (7 - j);
1232 if (m >= ARRAY_SIZE(est3_modes))
1234 if (est[i] & (1 << j)) {
1235 mode = drm_mode_find_dmt(connector->dev,
1241 drm_mode_probed_add(connector, mode);
1252 do_established_modes(struct detailed_timing *timing, void *c)
1254 struct detailed_mode_closure *closure = c;
1255 struct detailed_non_pixel *data = &timing->data.other_data;
1257 if (data->type == EDID_DETAIL_EST_TIMINGS)
1258 closure->modes += drm_est3_modes(closure->connector, timing);
1262 * add_established_modes - get est. modes from EDID and add them
1263 * @edid: EDID block to scan
1265 * Each EDID block contains a bitmap of the supported "established modes" list
1266 * (defined above). Tease them out and add them to the global modes list.
1269 add_established_modes(struct drm_connector *connector, struct edid *edid)
1271 struct drm_device *dev = connector->dev;
1272 unsigned long est_bits = edid->established_timings.t1 |
1273 (edid->established_timings.t2 << 8) |
1274 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1276 struct detailed_mode_closure closure = {
1277 connector, edid, 0, 0, 0
1280 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1281 if (est_bits & (1<<i)) {
1282 struct drm_display_mode *newmode;
1283 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1285 drm_mode_probed_add(connector, newmode);
1291 if (version_greater(edid, 1, 0))
1292 drm_for_each_detailed_block((u8 *)edid,
1293 do_established_modes, &closure);
1295 return modes + closure.modes;
1299 do_standard_modes(struct detailed_timing *timing, void *c)
1301 struct detailed_mode_closure *closure = c;
1302 struct detailed_non_pixel *data = &timing->data.other_data;
1303 struct drm_connector *connector = closure->connector;
1304 struct edid *edid = closure->edid;
1306 if (data->type == EDID_DETAIL_STD_MODES) {
1308 for (i = 0; i < 6; i++) {
1309 struct std_timing *std;
1310 struct drm_display_mode *newmode;
1312 std = &data->data.timings[i];
1313 newmode = drm_mode_std(connector, edid, std,
1316 drm_mode_probed_add(connector, newmode);
1324 * add_standard_modes - get std. modes from EDID and add them
1325 * @edid: EDID block to scan
1327 * Standard modes can be calculated using the appropriate standard (DMT,
1328 * GTF or CVT. Grab them from @edid and add them to the list.
1331 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1334 struct detailed_mode_closure closure = {
1335 connector, edid, 0, 0, 0
1338 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1339 struct drm_display_mode *newmode;
1341 newmode = drm_mode_std(connector, edid,
1342 &edid->standard_timings[i],
1345 drm_mode_probed_add(connector, newmode);
1350 if (version_greater(edid, 1, 0))
1351 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1354 /* XXX should also look for standard codes in VTB blocks */
1356 return modes + closure.modes;
1359 static int drm_cvt_modes(struct drm_connector *connector,
1360 struct detailed_timing *timing)
1362 int i, j, modes = 0;
1363 struct drm_display_mode *newmode;
1364 struct drm_device *dev = connector->dev;
1365 struct cvt_timing *cvt;
1366 const int rates[] = { 60, 85, 75, 60, 50 };
1367 const u8 empty[3] = { 0, 0, 0 };
1369 for (i = 0; i < 4; i++) {
1370 int uninitialized_var(width), height;
1371 cvt = &(timing->data.other_data.data.cvt[i]);
1373 if (!memcmp(cvt->code, empty, 3))
1376 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1377 switch (cvt->code[1] & 0x0c) {
1379 width = height * 4 / 3;
1382 width = height * 16 / 9;
1385 width = height * 16 / 10;
1388 width = height * 15 / 9;
1392 for (j = 1; j < 5; j++) {
1393 if (cvt->code[2] & (1 << j)) {
1394 newmode = drm_cvt_mode(dev, width, height,
1398 drm_mode_probed_add(connector, newmode);
1409 do_cvt_mode(struct detailed_timing *timing, void *c)
1411 struct detailed_mode_closure *closure = c;
1412 struct detailed_non_pixel *data = &timing->data.other_data;
1414 if (data->type == EDID_DETAIL_CVT_3BYTE)
1415 closure->modes += drm_cvt_modes(closure->connector, timing);
1419 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1421 struct detailed_mode_closure closure = {
1422 connector, edid, 0, 0, 0
1425 if (version_greater(edid, 1, 2))
1426 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1428 /* XXX should also look for CVT codes in VTB blocks */
1430 return closure.modes;
1434 do_detailed_mode(struct detailed_timing *timing, void *c)
1436 struct detailed_mode_closure *closure = c;
1437 struct drm_display_mode *newmode;
1439 if (timing->pixel_clock) {
1440 newmode = drm_mode_detailed(closure->connector->dev,
1441 closure->edid, timing,
1446 if (closure->preferred)
1447 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1449 drm_mode_probed_add(closure->connector, newmode);
1451 closure->preferred = 0;
1456 * add_detailed_modes - Add modes from detailed timings
1457 * @connector: attached connector
1458 * @edid: EDID block to scan
1459 * @quirks: quirks to apply
1462 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1465 struct detailed_mode_closure closure = {
1473 if (closure.preferred && !version_greater(edid, 1, 3))
1475 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1477 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1479 return closure.modes;
1482 #define HDMI_IDENTIFIER 0x000C03
1483 #define AUDIO_BLOCK 0x01
1484 #define VIDEO_BLOCK 0x02
1485 #define VENDOR_BLOCK 0x03
1486 #define SPEAKER_BLOCK 0x04
1487 #define VIDEO_CAPABILITY_BLOCK 0x07
1488 #define EDID_BASIC_AUDIO (1 << 6)
1489 #define EDID_CEA_YCRCB444 (1 << 5)
1490 #define EDID_CEA_YCRCB422 (1 << 4)
1491 #define EDID_CEA_VCDB_QS (1 << 6)
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 * Looks for a CEA mode matching given drm_display_mode.
1521 * Returns its CEA Video ID code, or 0 if not found.
1523 u8 drm_match_cea_mode(struct drm_display_mode *to_match)
1525 struct drm_display_mode *cea_mode;
1528 for (mode = 0; mode < drm_num_cea_modes; mode++) {
1529 cea_mode = (struct drm_display_mode *)&edid_cea_modes[mode];
1531 if (drm_mode_equal(to_match, cea_mode))
1536 EXPORT_SYMBOL(drm_match_cea_mode);
1540 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1542 struct drm_device *dev = connector->dev;
1543 u8 * mode, cea_mode;
1546 for (mode = db; mode < db + len; mode++) {
1547 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1548 if (cea_mode < drm_num_cea_modes) {
1549 struct drm_display_mode *newmode;
1550 newmode = drm_mode_duplicate(dev,
1551 &edid_cea_modes[cea_mode]);
1553 drm_mode_probed_add(connector, newmode);
1563 cea_db_payload_len(const u8 *db)
1565 return db[0] & 0x1f;
1569 cea_db_tag(const u8 *db)
1575 cea_revision(const u8 *cea)
1581 cea_db_offsets(const u8 *cea, int *start, int *end)
1583 /* Data block offset in CEA extension block */
1588 if (*end < 4 || *end > 127)
1593 #define for_each_cea_db(cea, i, start, end) \
1594 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
1597 add_cea_modes(struct drm_connector *connector, struct edid *edid)
1599 u8 * cea = drm_find_cea_extension(edid);
1603 if (cea && cea_revision(cea) >= 3) {
1606 if (cea_db_offsets(cea, &start, &end))
1609 for_each_cea_db(cea, i, start, end) {
1611 dbl = cea_db_payload_len(db);
1613 if (cea_db_tag(db) == VIDEO_BLOCK)
1614 modes += do_cea_modes (connector, db+1, dbl);
1622 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db)
1624 u8 len = cea_db_payload_len(db);
1627 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1628 connector->dvi_dual = db[6] & 1;
1631 connector->max_tmds_clock = db[7] * 5;
1633 connector->latency_present[0] = db[8] >> 7;
1634 connector->latency_present[1] = (db[8] >> 6) & 1;
1637 connector->video_latency[0] = db[9];
1639 connector->audio_latency[0] = db[10];
1641 connector->video_latency[1] = db[11];
1643 connector->audio_latency[1] = db[12];
1645 DRM_DEBUG_KMS("HDMI: DVI dual %d, "
1646 "max TMDS clock %d, "
1647 "latency present %d %d, "
1648 "video latency %d %d, "
1649 "audio latency %d %d\n",
1650 connector->dvi_dual,
1651 connector->max_tmds_clock,
1652 (int) connector->latency_present[0],
1653 (int) connector->latency_present[1],
1654 connector->video_latency[0],
1655 connector->video_latency[1],
1656 connector->audio_latency[0],
1657 connector->audio_latency[1]);
1661 monitor_name(struct detailed_timing *t, void *data)
1663 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1664 *(u8 **)data = t->data.other_data.data.str.str;
1667 static bool cea_db_is_hdmi_vsdb(const u8 *db)
1671 if (cea_db_tag(db) != VENDOR_BLOCK)
1674 if (cea_db_payload_len(db) < 5)
1677 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16);
1679 return hdmi_id == HDMI_IDENTIFIER;
1683 * drm_edid_to_eld - build ELD from EDID
1684 * @connector: connector corresponding to the HDMI/DP sink
1685 * @edid: EDID to parse
1687 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1688 * Some ELD fields are left to the graphics driver caller:
1693 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1695 uint8_t *eld = connector->eld;
1703 memset(eld, 0, sizeof(connector->eld));
1705 cea = drm_find_cea_extension(edid);
1707 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1712 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1713 for (mnl = 0; name && mnl < 13; mnl++) {
1714 if (name[mnl] == 0x0a)
1716 eld[20 + mnl] = name[mnl];
1718 eld[4] = (cea[1] << 5) | mnl;
1719 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1721 eld[0] = 2 << 3; /* ELD version: 2 */
1723 eld[16] = edid->mfg_id[0];
1724 eld[17] = edid->mfg_id[1];
1725 eld[18] = edid->prod_code[0];
1726 eld[19] = edid->prod_code[1];
1728 if (cea_revision(cea) >= 3) {
1731 if (cea_db_offsets(cea, &start, &end)) {
1736 for_each_cea_db(cea, i, start, end) {
1738 dbl = cea_db_payload_len(db);
1740 switch (cea_db_tag(db)) {
1742 /* Audio Data Block, contains SADs */
1743 sad_count = dbl / 3;
1745 memcpy(eld + 20 + mnl, &db[1], dbl);
1748 /* Speaker Allocation Data Block */
1753 /* HDMI Vendor-Specific Data Block */
1754 if (cea_db_is_hdmi_vsdb(db))
1755 parse_hdmi_vsdb(connector, db);
1762 eld[5] |= sad_count << 4;
1763 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1765 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1767 EXPORT_SYMBOL(drm_edid_to_eld);
1770 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1771 * @connector: connector associated with the HDMI/DP sink
1772 * @mode: the display mode
1774 int drm_av_sync_delay(struct drm_connector *connector,
1775 struct drm_display_mode *mode)
1777 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1780 if (!connector->latency_present[0])
1782 if (!connector->latency_present[1])
1785 a = connector->audio_latency[i];
1786 v = connector->video_latency[i];
1789 * HDMI/DP sink doesn't support audio or video?
1791 if (a == 255 || v == 255)
1795 * Convert raw EDID values to millisecond.
1796 * Treat unknown latency as 0ms.
1799 a = min(2 * (a - 1), 500);
1801 v = min(2 * (v - 1), 500);
1803 return max(v - a, 0);
1805 EXPORT_SYMBOL(drm_av_sync_delay);
1808 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1809 * @encoder: the encoder just changed display mode
1810 * @mode: the adjusted display mode
1812 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1813 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1815 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1816 struct drm_display_mode *mode)
1818 struct drm_connector *connector;
1819 struct drm_device *dev = encoder->dev;
1821 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1822 if (connector->encoder == encoder && connector->eld[0])
1827 EXPORT_SYMBOL(drm_select_eld);
1830 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1831 * @edid: monitor EDID information
1833 * Parse the CEA extension according to CEA-861-B.
1834 * Return true if HDMI, false if not or unknown.
1836 bool drm_detect_hdmi_monitor(struct edid *edid)
1840 int start_offset, end_offset;
1842 edid_ext = drm_find_cea_extension(edid);
1846 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1850 * Because HDMI identifier is in Vendor Specific Block,
1851 * search it from all data blocks of CEA extension.
1853 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1854 if (cea_db_is_hdmi_vsdb(&edid_ext[i]))
1860 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1863 * drm_detect_monitor_audio - check monitor audio capability
1865 * Monitor should have CEA extension block.
1866 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1867 * audio' only. If there is any audio extension block and supported
1868 * audio format, assume at least 'basic audio' support, even if 'basic
1869 * audio' is not defined in EDID.
1872 bool drm_detect_monitor_audio(struct edid *edid)
1876 bool has_audio = false;
1877 int start_offset, end_offset;
1879 edid_ext = drm_find_cea_extension(edid);
1883 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1886 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1890 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1893 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1894 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) {
1896 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3)
1897 DRM_DEBUG_KMS("CEA audio format %d\n",
1898 (edid_ext[i + j] >> 3) & 0xf);
1905 EXPORT_SYMBOL(drm_detect_monitor_audio);
1908 * drm_rgb_quant_range_selectable - is RGB quantization range selectable?
1910 * Check whether the monitor reports the RGB quantization range selection
1911 * as supported. The AVI infoframe can then be used to inform the monitor
1912 * which quantization range (full or limited) is used.
1914 bool drm_rgb_quant_range_selectable(struct edid *edid)
1919 edid_ext = drm_find_cea_extension(edid);
1923 if (cea_db_offsets(edid_ext, &start, &end))
1926 for_each_cea_db(edid_ext, i, start, end) {
1927 if (cea_db_tag(&edid_ext[i]) == VIDEO_CAPABILITY_BLOCK &&
1928 cea_db_payload_len(&edid_ext[i]) == 2) {
1929 DRM_DEBUG_KMS("CEA VCDB 0x%02x\n", edid_ext[i + 2]);
1930 return edid_ext[i + 2] & EDID_CEA_VCDB_QS;
1936 EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
1939 * drm_add_display_info - pull display info out if present
1941 * @info: display info (attached to connector)
1943 * Grab any available display info and stuff it into the drm_display_info
1944 * structure that's part of the connector. Useful for tracking bpp and
1947 static void drm_add_display_info(struct edid *edid,
1948 struct drm_display_info *info)
1952 info->width_mm = edid->width_cm * 10;
1953 info->height_mm = edid->height_cm * 10;
1955 /* driver figures it out in this case */
1957 info->color_formats = 0;
1959 if (edid->revision < 3)
1962 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1965 /* Get data from CEA blocks if present */
1966 edid_ext = drm_find_cea_extension(edid);
1968 info->cea_rev = edid_ext[1];
1970 /* The existence of a CEA block should imply RGB support */
1971 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1972 if (edid_ext[3] & EDID_CEA_YCRCB444)
1973 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1974 if (edid_ext[3] & EDID_CEA_YCRCB422)
1975 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1978 /* Only defined for 1.4 with digital displays */
1979 if (edid->revision < 4)
1982 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1983 case DRM_EDID_DIGITAL_DEPTH_6:
1986 case DRM_EDID_DIGITAL_DEPTH_8:
1989 case DRM_EDID_DIGITAL_DEPTH_10:
1992 case DRM_EDID_DIGITAL_DEPTH_12:
1995 case DRM_EDID_DIGITAL_DEPTH_14:
1998 case DRM_EDID_DIGITAL_DEPTH_16:
2001 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
2007 info->color_formats |= DRM_COLOR_FORMAT_RGB444;
2008 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
2009 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
2010 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
2011 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
2015 * drm_add_edid_modes - add modes from EDID data, if available
2016 * @connector: connector we're probing
2019 * Add the specified modes to the connector's mode list.
2021 * Return number of modes added or 0 if we couldn't find any.
2023 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
2031 if (!drm_edid_is_valid(edid)) {
2032 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
2033 drm_get_connector_name(connector));
2037 quirks = edid_get_quirks(edid);
2040 * EDID spec says modes should be preferred in this order:
2041 * - preferred detailed mode
2042 * - other detailed modes from base block
2043 * - detailed modes from extension blocks
2044 * - CVT 3-byte code modes
2045 * - standard timing codes
2046 * - established timing codes
2047 * - modes inferred from GTF or CVT range information
2049 * We get this pretty much right.
2051 * XXX order for additional mode types in extension blocks?
2053 num_modes += add_detailed_modes(connector, edid, quirks);
2054 num_modes += add_cvt_modes(connector, edid);
2055 num_modes += add_standard_modes(connector, edid);
2056 num_modes += add_established_modes(connector, edid);
2057 if (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)
2058 num_modes += add_inferred_modes(connector, edid);
2059 num_modes += add_cea_modes(connector, edid);
2061 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
2062 edid_fixup_preferred(connector, quirks);
2064 drm_add_display_info(edid, &connector->display_info);
2068 EXPORT_SYMBOL(drm_add_edid_modes);
2071 * drm_add_modes_noedid - add modes for the connectors without EDID
2072 * @connector: connector we're probing
2073 * @hdisplay: the horizontal display limit
2074 * @vdisplay: the vertical display limit
2076 * Add the specified modes to the connector's mode list. Only when the
2077 * hdisplay/vdisplay is not beyond the given limit, it will be added.
2079 * Return number of modes added or 0 if we couldn't find any.
2081 int drm_add_modes_noedid(struct drm_connector *connector,
2082 int hdisplay, int vdisplay)
2084 int i, count, num_modes = 0;
2085 struct drm_display_mode *mode;
2086 struct drm_device *dev = connector->dev;
2088 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
2094 for (i = 0; i < count; i++) {
2095 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
2096 if (hdisplay && vdisplay) {
2098 * Only when two are valid, they will be used to check
2099 * whether the mode should be added to the mode list of
2102 if (ptr->hdisplay > hdisplay ||
2103 ptr->vdisplay > vdisplay)
2106 if (drm_mode_vrefresh(ptr) > 61)
2108 mode = drm_mode_duplicate(dev, ptr);
2110 drm_mode_probed_add(connector, mode);
2116 EXPORT_SYMBOL(drm_add_modes_noedid);
2119 * drm_mode_cea_vic - return the CEA-861 VIC of a given mode
2123 * The VIC number, 0 in case it's not a CEA-861 mode.
2125 uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode)
2129 for (i = 0; i < drm_num_cea_modes; i++)
2130 if (drm_mode_equal(mode, &edid_cea_modes[i]))
2135 EXPORT_SYMBOL(drm_mode_cea_vic);