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.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <dev/drm2/drmP.h>
35 #include <dev/drm2/drm_edid.h>
36 #include "drm_edid_modes.h"
37 #include <dev/iicbus/iic.h>
38 #include <dev/iicbus/iiconf.h>
39 #include "iicbus_if.h"
41 #define version_greater(edid, maj, min) \
42 (((edid)->version > (maj)) || \
43 ((edid)->version == (maj) && (edid)->revision > (min)))
45 #define EDID_EST_TIMINGS 16
46 #define EDID_STD_TIMINGS 8
47 #define EDID_DETAILED_TIMINGS 4
50 * EDID blocks out in the wild have a variety of bugs, try to collect
51 * them here (note that userspace may work around broken monitors first,
52 * but fixes should make their way here so that the kernel "just works"
53 * on as many displays as possible).
56 /* First detailed mode wrong, use largest 60Hz mode */
57 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
58 /* Reported 135MHz pixel clock is too high, needs adjustment */
59 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
60 /* Prefer the largest mode at 75 Hz */
61 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
62 /* Detail timing is in cm not mm */
63 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
64 /* Detailed timing descriptors have bogus size values, so just take the
65 * maximum size and use that.
67 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
68 /* Monitor forgot to set the first detailed is preferred bit. */
69 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
70 /* use +hsync +vsync for detailed mode */
71 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
72 /* Force reduced-blanking timings for detailed modes */
73 #define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7)
75 struct detailed_mode_closure {
76 struct drm_connector *connector;
88 static struct edid_quirk {
92 } edid_quirk_list[] = {
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 DRM_DEBUG_KMS("Raw EDID:\n");
217 for (i = 0; i < EDID_LENGTH; ) {
218 printf("%02x", raw_edid[i]);
220 if (i % 16 == 0 || i == EDID_LENGTH)
230 EXPORT_SYMBOL(drm_edid_block_valid);
233 * drm_edid_is_valid - sanity check EDID data
236 * Sanity-check an entire EDID record (including extensions)
238 bool drm_edid_is_valid(struct edid *edid)
241 u8 *raw = (u8 *)edid;
246 for (i = 0; i <= edid->extensions; i++)
247 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true))
252 EXPORT_SYMBOL(drm_edid_is_valid);
254 #define DDC_SEGMENT_ADDR 0x30
256 * Get EDID information via I2C.
258 * \param adapter : i2c device adaptor
259 * \param buf : EDID data buffer to be filled
260 * \param len : EDID data buffer length
261 * \return 0 on success or -1 on failure.
263 * Try to fetch EDID information by calling i2c driver function.
266 drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf,
269 unsigned char start = block * EDID_LENGTH;
270 unsigned char segment = block >> 1;
271 unsigned char xfers = segment ? 3 : 2;
272 int ret, retries = 5;
274 /* The core i2c driver will automatically retry the transfer if the
275 * adapter reports EAGAIN. However, we find that bit-banging transfers
276 * are susceptible to errors under a heavily loaded machine and
277 * generate spurious NAKs and timeouts. Retrying the transfer
278 * of the individual block a few times seems to overcome this.
281 struct iic_msg msgs[] = {
283 .slave = DDC_SEGMENT_ADDR << 1,
288 .slave = DDC_ADDR << 1,
293 .slave = DDC_ADDR << 1,
301 * Avoid sending the segment addr to not upset non-compliant ddc
304 ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers);
307 DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n",
309 } while (ret != 0 && --retries);
311 return ret == 0 ? 0 : -1;
314 static bool drm_edid_is_zero(u8 *in_edid, int length)
317 u32 *raw_edid = (u32 *)in_edid;
319 for (i = 0; i < length / 4; i++)
320 if (*(raw_edid + i) != 0)
327 drm_do_get_edid(struct drm_connector *connector, device_t adapter)
329 int i, j = 0, valid_extensions = 0;
331 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_DEBUGBITS_KMS);
333 if ((block = malloc(EDID_LENGTH, DRM_MEM_KMS, M_NOWAIT)) == NULL)
336 /* base block fetch */
337 for (i = 0; i < 4; i++) {
338 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
340 if (drm_edid_block_valid(block, 0, print_bad_edid))
342 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
343 connector->null_edid_counter++;
350 /* if there's no extensions, we're done */
351 if (block[0x7e] == 0)
354 new = reallocf(block, (block[0x7e] + 1) * EDID_LENGTH, DRM_MEM_KMS,
360 for (j = 1; j <= block[0x7e]; j++) {
361 for (i = 0; i < 4; i++) {
362 if (drm_do_probe_ddc_edid(adapter,
363 block + (valid_extensions + 1) * EDID_LENGTH,
366 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) {
372 if (i == 4 && print_bad_edid) {
373 dev_warn(connector->dev->dev,
374 "%s: Ignoring invalid EDID block %d.\n",
375 drm_get_connector_name(connector), j);
377 connector->bad_edid_counter++;
381 if (valid_extensions != block[0x7e]) {
382 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
383 block[0x7e] = valid_extensions;
384 new = reallocf(block, (valid_extensions + 1) * EDID_LENGTH,
385 DRM_MEM_KMS, M_NOWAIT);
394 if (print_bad_edid) {
395 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
396 drm_get_connector_name(connector), j);
398 connector->bad_edid_counter++;
401 free(block, DRM_MEM_KMS);
406 * Probe DDC presence.
408 * \param adapter : i2c device adaptor
409 * \return 1 on success
412 drm_probe_ddc(device_t adapter)
416 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
418 EXPORT_SYMBOL(drm_probe_ddc);
421 * drm_get_edid - get EDID data, if available
422 * @connector: connector we're probing
423 * @adapter: i2c adapter to use for DDC
425 * Poke the given i2c channel to grab EDID data if possible. If found,
426 * attach it to the connector.
428 * Return edid data or NULL if we couldn't find any.
430 struct edid *drm_get_edid(struct drm_connector *connector,
433 struct edid *edid = NULL;
435 if (drm_probe_ddc(adapter))
436 edid = (struct edid *)drm_do_get_edid(connector, adapter);
440 EXPORT_SYMBOL(drm_get_edid);
442 /*** EDID parsing ***/
445 * edid_vendor - match a string against EDID's obfuscated vendor field
446 * @edid: EDID to match
447 * @vendor: vendor string
449 * Returns true if @vendor is in @edid, false otherwise
451 static bool edid_vendor(struct edid *edid, char *vendor)
455 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
456 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
457 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
458 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
460 return !strncmp(edid_vendor, vendor, 3);
464 * edid_get_quirks - return quirk flags for a given EDID
465 * @edid: EDID to process
467 * This tells subsequent routines what fixes they need to apply.
469 static u32 edid_get_quirks(struct edid *edid)
471 struct edid_quirk *quirk;
474 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
475 quirk = &edid_quirk_list[i];
477 if (edid_vendor(edid, quirk->vendor) &&
478 (EDID_PRODUCT_ID(edid) == quirk->product_id))
479 return quirk->quirks;
485 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
486 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
489 * edid_fixup_preferred - set preferred modes based on quirk list
490 * @connector: has mode list to fix up
491 * @quirks: quirks list
493 * Walk the mode list for @connector, clearing the preferred status
494 * on existing modes and setting it anew for the right mode ala @quirks.
496 static void edid_fixup_preferred(struct drm_connector *connector,
499 struct drm_display_mode *t, *cur_mode, *preferred_mode;
500 int target_refresh = 0;
502 if (list_empty(&connector->probed_modes))
505 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
507 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
510 preferred_mode = list_first_entry(&connector->probed_modes,
511 struct drm_display_mode, head);
513 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
514 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
516 if (cur_mode == preferred_mode)
519 /* Largest mode is preferred */
520 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
521 preferred_mode = cur_mode;
523 /* At a given size, try to get closest to target refresh */
524 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
525 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
526 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
527 preferred_mode = cur_mode;
531 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
535 mode_is_rb(const struct drm_display_mode *mode)
537 return (mode->htotal - mode->hdisplay == 160) &&
538 (mode->hsync_end - mode->hdisplay == 80) &&
539 (mode->hsync_end - mode->hsync_start == 32) &&
540 (mode->vsync_start - mode->vdisplay == 3);
544 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
545 * @dev: Device to duplicate against
547 * @vsize: Mode height
548 * @fresh: Mode refresh rate
549 * @rb: Mode reduced-blanking-ness
551 * Walk the DMT mode list looking for a match for the given parameters.
552 * Return a newly allocated copy of the mode, or NULL if not found.
554 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
555 int hsize, int vsize, int fresh,
560 for (i = 0; i < drm_num_dmt_modes; i++) {
561 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
562 if (hsize != ptr->hdisplay)
564 if (vsize != ptr->vdisplay)
566 if (fresh != drm_mode_vrefresh(ptr))
568 if (rb != mode_is_rb(ptr))
571 return drm_mode_duplicate(dev, ptr);
576 EXPORT_SYMBOL(drm_mode_find_dmt);
578 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
581 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
585 u8 *det_base = ext + d;
588 for (i = 0; i < n; i++)
589 cb((struct detailed_timing *)(det_base + 18 * i), closure);
593 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
595 unsigned int i, n = min((int)ext[0x02], 6);
596 u8 *det_base = ext + 5;
599 return; /* unknown version */
601 for (i = 0; i < n; i++)
602 cb((struct detailed_timing *)(det_base + 18 * i), closure);
606 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
609 struct edid *edid = (struct edid *)raw_edid;
614 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
615 cb(&(edid->detailed_timings[i]), closure);
617 for (i = 1; i <= raw_edid[0x7e]; i++) {
618 u8 *ext = raw_edid + (i * EDID_LENGTH);
621 cea_for_each_detailed_block(ext, cb, closure);
624 vtb_for_each_detailed_block(ext, cb, closure);
633 is_rb(struct detailed_timing *t, void *data)
636 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
638 *(bool *)data = true;
641 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
643 drm_monitor_supports_rb(struct edid *edid)
645 if (edid->revision >= 4) {
647 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
651 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
655 find_gtf2(struct detailed_timing *t, void *data)
658 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
662 /* Secondary GTF curve kicks in above some break frequency */
664 drm_gtf2_hbreak(struct edid *edid)
667 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
668 return r ? (r[12] * 2) : 0;
672 drm_gtf2_2c(struct edid *edid)
675 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
676 return r ? r[13] : 0;
680 drm_gtf2_m(struct edid *edid)
683 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
684 return r ? (r[15] << 8) + r[14] : 0;
688 drm_gtf2_k(struct edid *edid)
691 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
692 return r ? r[16] : 0;
696 drm_gtf2_2j(struct edid *edid)
699 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
700 return r ? r[17] : 0;
704 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
705 * @edid: EDID block to scan
707 static int standard_timing_level(struct edid *edid)
709 if (edid->revision >= 2) {
710 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
712 if (drm_gtf2_hbreak(edid))
720 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
721 * monitors fill with ascii space (0x20) instead.
724 bad_std_timing(u8 a, u8 b)
726 return (a == 0x00 && b == 0x00) ||
727 (a == 0x01 && b == 0x01) ||
728 (a == 0x20 && b == 0x20);
732 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
733 * @t: standard timing params
734 * @timing_level: standard timing level
736 * Take the standard timing params (in this case width, aspect, and refresh)
737 * and convert them into a real mode using CVT/GTF/DMT.
739 static struct drm_display_mode *
740 drm_mode_std(struct drm_connector *connector, struct edid *edid,
741 struct std_timing *t, int revision)
743 struct drm_device *dev = connector->dev;
744 struct drm_display_mode *m, *mode = NULL;
747 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
748 >> EDID_TIMING_ASPECT_SHIFT;
749 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
750 >> EDID_TIMING_VFREQ_SHIFT;
751 int timing_level = standard_timing_level(edid);
753 if (bad_std_timing(t->hsize, t->vfreq_aspect))
756 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
757 hsize = t->hsize * 8 + 248;
758 /* vrefresh_rate = vfreq + 60 */
759 vrefresh_rate = vfreq + 60;
760 /* the vdisplay is calculated based on the aspect ratio */
761 if (aspect_ratio == 0) {
765 vsize = (hsize * 10) / 16;
766 } else if (aspect_ratio == 1)
767 vsize = (hsize * 3) / 4;
768 else if (aspect_ratio == 2)
769 vsize = (hsize * 4) / 5;
771 vsize = (hsize * 9) / 16;
773 /* HDTV hack, part 1 */
774 if (vrefresh_rate == 60 &&
775 ((hsize == 1360 && vsize == 765) ||
776 (hsize == 1368 && vsize == 769))) {
782 * If this connector already has a mode for this size and refresh
783 * rate (because it came from detailed or CVT info), use that
784 * instead. This way we don't have to guess at interlace or
787 list_for_each_entry(m, &connector->probed_modes, head)
788 if (m->hdisplay == hsize && m->vdisplay == vsize &&
789 drm_mode_vrefresh(m) == vrefresh_rate)
792 /* HDTV hack, part 2 */
793 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
794 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
796 mode->hdisplay = 1366;
797 mode->hsync_start = mode->hsync_start - 1;
798 mode->hsync_end = mode->hsync_end - 1;
802 /* check whether it can be found in default mode table */
803 if (drm_monitor_supports_rb(edid)) {
804 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
809 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
813 /* okay, generate it */
814 switch (timing_level) {
818 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
822 * This is potentially wrong if there's ever a monitor with
823 * more than one ranges section, each claiming a different
824 * secondary GTF curve. Please don't do that.
826 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
829 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
830 drm_mode_destroy(dev, mode);
831 mode = drm_gtf_mode_complex(dev, hsize, vsize,
840 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
848 * EDID is delightfully ambiguous about how interlaced modes are to be
849 * encoded. Our internal representation is of frame height, but some
850 * HDTV detailed timings are encoded as field height.
852 * The format list here is from CEA, in frame size. Technically we
853 * should be checking refresh rate too. Whatever.
856 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
857 struct detailed_pixel_timing *pt)
860 static const struct {
862 } cea_interlaced[] = {
872 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
875 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
876 if ((mode->hdisplay == cea_interlaced[i].w) &&
877 (mode->vdisplay == cea_interlaced[i].h / 2)) {
879 mode->vsync_start *= 2;
880 mode->vsync_end *= 2;
886 mode->flags |= DRM_MODE_FLAG_INTERLACE;
890 * drm_mode_detailed - create a new mode from an EDID detailed timing section
891 * @dev: DRM device (needed to create new mode)
893 * @timing: EDID detailed timing info
894 * @quirks: quirks to apply
896 * An EDID detailed timing block contains enough info for us to create and
897 * return a new struct drm_display_mode.
899 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
901 struct detailed_timing *timing,
904 struct drm_display_mode *mode;
905 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
906 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
907 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
908 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
909 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
910 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
911 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
912 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) << 2 | pt->vsync_offset_pulse_width_lo >> 4;
913 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
915 /* ignore tiny modes */
916 if (hactive < 64 || vactive < 64)
919 if (pt->misc & DRM_EDID_PT_STEREO) {
920 printf("stereo mode not supported\n");
923 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
924 printf("composite sync not supported\n");
927 /* it is incorrect if hsync/vsync width is zero */
928 if (!hsync_pulse_width || !vsync_pulse_width) {
929 DRM_DEBUG_KMS("Incorrect Detailed timing. "
930 "Wrong Hsync/Vsync pulse width\n");
934 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
935 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
942 mode = drm_mode_create(dev);
946 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
947 timing->pixel_clock = cpu_to_le16(1088);
949 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
951 mode->hdisplay = hactive;
952 mode->hsync_start = mode->hdisplay + hsync_offset;
953 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
954 mode->htotal = mode->hdisplay + hblank;
956 mode->vdisplay = vactive;
957 mode->vsync_start = mode->vdisplay + vsync_offset;
958 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
959 mode->vtotal = mode->vdisplay + vblank;
961 /* Some EDIDs have bogus h/vtotal values */
962 if (mode->hsync_end > mode->htotal)
963 mode->htotal = mode->hsync_end + 1;
964 if (mode->vsync_end > mode->vtotal)
965 mode->vtotal = mode->vsync_end + 1;
967 drm_mode_do_interlace_quirk(mode, pt);
969 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
970 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
973 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
974 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
975 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
976 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
979 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
980 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
982 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
983 mode->width_mm *= 10;
984 mode->height_mm *= 10;
987 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
988 mode->width_mm = edid->width_cm * 10;
989 mode->height_mm = edid->height_cm * 10;
992 mode->type = DRM_MODE_TYPE_DRIVER;
993 mode->vrefresh = drm_mode_vrefresh(mode);
994 drm_mode_set_name(mode);
1000 mode_in_hsync_range(const struct drm_display_mode *mode,
1001 struct edid *edid, u8 *t)
1003 int hsync, hmin, hmax;
1006 if (edid->revision >= 4)
1007 hmin += ((t[4] & 0x04) ? 255 : 0);
1009 if (edid->revision >= 4)
1010 hmax += ((t[4] & 0x08) ? 255 : 0);
1011 hsync = drm_mode_hsync(mode);
1013 return (hsync <= hmax && hsync >= hmin);
1017 mode_in_vsync_range(const struct drm_display_mode *mode,
1018 struct edid *edid, u8 *t)
1020 int vsync, vmin, vmax;
1023 if (edid->revision >= 4)
1024 vmin += ((t[4] & 0x01) ? 255 : 0);
1026 if (edid->revision >= 4)
1027 vmax += ((t[4] & 0x02) ? 255 : 0);
1028 vsync = drm_mode_vrefresh(mode);
1030 return (vsync <= vmax && vsync >= vmin);
1034 range_pixel_clock(struct edid *edid, u8 *t)
1037 if (t[9] == 0 || t[9] == 255)
1040 /* 1.4 with CVT support gives us real precision, yay */
1041 if (edid->revision >= 4 && t[10] == 0x04)
1042 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1044 /* 1.3 is pathetic, so fuzz up a bit */
1045 return t[9] * 10000 + 5001;
1049 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1050 struct detailed_timing *timing)
1053 u8 *t = (u8 *)timing;
1055 if (!mode_in_hsync_range(mode, edid, t))
1058 if (!mode_in_vsync_range(mode, edid, t))
1061 if ((max_clock = range_pixel_clock(edid, t)))
1062 if (mode->clock > max_clock)
1065 /* 1.4 max horizontal check */
1066 if (edid->revision >= 4 && t[10] == 0x04)
1067 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1070 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1076 static bool valid_inferred_mode(const struct drm_connector *connector,
1077 const struct drm_display_mode *mode)
1079 struct drm_display_mode *m;
1082 list_for_each_entry(m, &connector->probed_modes, head) {
1083 if (mode->hdisplay == m->hdisplay &&
1084 mode->vdisplay == m->vdisplay &&
1085 drm_mode_vrefresh(mode) == drm_mode_vrefresh(m))
1086 return false; /* duplicated */
1087 if (mode->hdisplay <= m->hdisplay &&
1088 mode->vdisplay <= m->vdisplay)
1095 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1096 struct detailed_timing *timing)
1099 struct drm_display_mode *newmode;
1100 struct drm_device *dev = connector->dev;
1102 for (i = 0; i < drm_num_dmt_modes; i++) {
1103 if (mode_in_range(drm_dmt_modes + i, edid, timing) &&
1104 valid_inferred_mode(connector, drm_dmt_modes + i)) {
1105 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1107 drm_mode_probed_add(connector, newmode);
1116 /* fix up 1366x768 mode from 1368x768;
1117 * GFT/CVT can't express 1366 width which isn't dividable by 8
1119 static void fixup_mode_1366x768(struct drm_display_mode *mode)
1121 if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1122 mode->hdisplay = 1366;
1123 mode->hsync_start--;
1125 drm_mode_set_name(mode);
1130 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1131 struct detailed_timing *timing)
1134 struct drm_display_mode *newmode;
1135 struct drm_device *dev = connector->dev;
1137 for (i = 0; i < num_extra_modes; i++) {
1138 const struct minimode *m = &extra_modes[i];
1139 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1143 fixup_mode_1366x768(newmode);
1144 if (!mode_in_range(newmode, edid, timing) ||
1145 !valid_inferred_mode(connector, newmode)) {
1146 drm_mode_destroy(dev, newmode);
1150 drm_mode_probed_add(connector, newmode);
1158 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1159 struct detailed_timing *timing)
1162 struct drm_display_mode *newmode;
1163 struct drm_device *dev = connector->dev;
1164 bool rb = drm_monitor_supports_rb(edid);
1166 for (i = 0; i < num_extra_modes; i++) {
1167 const struct minimode *m = &extra_modes[i];
1168 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1172 fixup_mode_1366x768(newmode);
1173 if (!mode_in_range(newmode, edid, timing) ||
1174 !valid_inferred_mode(connector, newmode)) {
1175 drm_mode_destroy(dev, newmode);
1179 drm_mode_probed_add(connector, newmode);
1187 do_inferred_modes(struct detailed_timing *timing, void *c)
1189 struct detailed_mode_closure *closure = c;
1190 struct detailed_non_pixel *data = &timing->data.other_data;
1191 struct detailed_data_monitor_range *range = &data->data.range;
1193 if (data->type != EDID_DETAIL_MONITOR_RANGE)
1196 closure->modes += drm_dmt_modes_for_range(closure->connector,
1200 if (!version_greater(closure->edid, 1, 1))
1201 return; /* GTF not defined yet */
1203 switch (range->flags) {
1204 case 0x02: /* secondary gtf, XXX could do more */
1205 case 0x00: /* default gtf */
1206 closure->modes += drm_gtf_modes_for_range(closure->connector,
1210 case 0x04: /* cvt, only in 1.4+ */
1211 if (!version_greater(closure->edid, 1, 3))
1214 closure->modes += drm_cvt_modes_for_range(closure->connector,
1218 case 0x01: /* just the ranges, no formula */
1225 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1227 struct detailed_mode_closure closure = {
1228 connector, edid, 0, 0, 0
1231 if (version_greater(edid, 1, 0))
1232 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1235 return closure.modes;
1239 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1241 int i, j, m, modes = 0;
1242 struct drm_display_mode *mode;
1243 u8 *est = ((u8 *)timing) + 5;
1245 for (i = 0; i < 6; i++) {
1246 for (j = 7; j > 0; j--) {
1247 m = (i * 8) + (7 - j);
1248 if (m >= ARRAY_SIZE(est3_modes))
1250 if (est[i] & (1 << j)) {
1251 mode = drm_mode_find_dmt(connector->dev,
1257 drm_mode_probed_add(connector, mode);
1268 do_established_modes(struct detailed_timing *timing, void *c)
1270 struct detailed_mode_closure *closure = c;
1271 struct detailed_non_pixel *data = &timing->data.other_data;
1273 if (data->type == EDID_DETAIL_EST_TIMINGS)
1274 closure->modes += drm_est3_modes(closure->connector, timing);
1278 * add_established_modes - get est. modes from EDID and add them
1279 * @edid: EDID block to scan
1281 * Each EDID block contains a bitmap of the supported "established modes" list
1282 * (defined above). Tease them out and add them to the global modes list.
1285 add_established_modes(struct drm_connector *connector, struct edid *edid)
1287 struct drm_device *dev = connector->dev;
1288 unsigned long est_bits = edid->established_timings.t1 |
1289 (edid->established_timings.t2 << 8) |
1290 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1292 struct detailed_mode_closure closure = {
1293 connector, edid, 0, 0, 0
1296 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1297 if (est_bits & (1<<i)) {
1298 struct drm_display_mode *newmode;
1299 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1301 drm_mode_probed_add(connector, newmode);
1307 if (version_greater(edid, 1, 0))
1308 drm_for_each_detailed_block((u8 *)edid,
1309 do_established_modes, &closure);
1311 return modes + closure.modes;
1315 do_standard_modes(struct detailed_timing *timing, void *c)
1317 struct detailed_mode_closure *closure = c;
1318 struct detailed_non_pixel *data = &timing->data.other_data;
1319 struct drm_connector *connector = closure->connector;
1320 struct edid *edid = closure->edid;
1322 if (data->type == EDID_DETAIL_STD_MODES) {
1324 for (i = 0; i < 6; i++) {
1325 struct std_timing *std;
1326 struct drm_display_mode *newmode;
1328 std = &data->data.timings[i];
1329 newmode = drm_mode_std(connector, edid, std,
1332 drm_mode_probed_add(connector, newmode);
1340 * add_standard_modes - get std. modes from EDID and add them
1341 * @edid: EDID block to scan
1343 * Standard modes can be calculated using the appropriate standard (DMT,
1344 * GTF or CVT. Grab them from @edid and add them to the list.
1347 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1350 struct detailed_mode_closure closure = {
1351 connector, edid, 0, 0, 0
1354 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1355 struct drm_display_mode *newmode;
1357 newmode = drm_mode_std(connector, edid,
1358 &edid->standard_timings[i],
1361 drm_mode_probed_add(connector, newmode);
1366 if (version_greater(edid, 1, 0))
1367 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1370 /* XXX should also look for standard codes in VTB blocks */
1372 return modes + closure.modes;
1375 static int drm_cvt_modes(struct drm_connector *connector,
1376 struct detailed_timing *timing)
1378 int i, j, modes = 0;
1379 struct drm_display_mode *newmode;
1380 struct drm_device *dev = connector->dev;
1381 struct cvt_timing *cvt;
1382 const int rates[] = { 60, 85, 75, 60, 50 };
1383 const u8 empty[3] = { 0, 0, 0 };
1385 for (i = 0; i < 4; i++) {
1386 int width = 0, height;
1387 cvt = &(timing->data.other_data.data.cvt[i]);
1389 if (!memcmp(cvt->code, empty, 3))
1392 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1393 switch (cvt->code[1] & 0x0c) {
1395 width = height * 4 / 3;
1398 width = height * 16 / 9;
1401 width = height * 16 / 10;
1404 width = height * 15 / 9;
1408 for (j = 1; j < 5; j++) {
1409 if (cvt->code[2] & (1 << j)) {
1410 newmode = drm_cvt_mode(dev, width, height,
1414 drm_mode_probed_add(connector, newmode);
1425 do_cvt_mode(struct detailed_timing *timing, void *c)
1427 struct detailed_mode_closure *closure = c;
1428 struct detailed_non_pixel *data = &timing->data.other_data;
1430 if (data->type == EDID_DETAIL_CVT_3BYTE)
1431 closure->modes += drm_cvt_modes(closure->connector, timing);
1435 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1437 struct detailed_mode_closure closure = {
1438 connector, edid, 0, 0, 0
1441 if (version_greater(edid, 1, 2))
1442 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1444 /* XXX should also look for CVT codes in VTB blocks */
1446 return closure.modes;
1450 do_detailed_mode(struct detailed_timing *timing, void *c)
1452 struct detailed_mode_closure *closure = c;
1453 struct drm_display_mode *newmode;
1455 if (timing->pixel_clock) {
1456 newmode = drm_mode_detailed(closure->connector->dev,
1457 closure->edid, timing,
1462 if (closure->preferred)
1463 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1465 drm_mode_probed_add(closure->connector, newmode);
1467 closure->preferred = 0;
1472 * add_detailed_modes - Add modes from detailed timings
1473 * @connector: attached connector
1474 * @edid: EDID block to scan
1475 * @quirks: quirks to apply
1478 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1481 struct detailed_mode_closure closure = {
1489 if (closure.preferred && !version_greater(edid, 1, 3))
1491 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1493 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1495 return closure.modes;
1498 #define HDMI_IDENTIFIER 0x000C03
1499 #define AUDIO_BLOCK 0x01
1500 #define VIDEO_BLOCK 0x02
1501 #define VENDOR_BLOCK 0x03
1502 #define SPEAKER_BLOCK 0x04
1503 #define EDID_BASIC_AUDIO (1 << 6)
1504 #define EDID_CEA_YCRCB444 (1 << 5)
1505 #define EDID_CEA_YCRCB422 (1 << 4)
1508 * Search EDID for CEA extension block.
1510 u8 *drm_find_cea_extension(struct edid *edid)
1512 u8 *edid_ext = NULL;
1515 /* No EDID or EDID extensions */
1516 if (edid == NULL || edid->extensions == 0)
1519 /* Find CEA extension */
1520 for (i = 0; i < edid->extensions; i++) {
1521 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1522 if (edid_ext[0] == CEA_EXT)
1526 if (i == edid->extensions)
1531 EXPORT_SYMBOL(drm_find_cea_extension);
1534 * Looks for a CEA mode matching given drm_display_mode.
1535 * Returns its CEA Video ID code, or 0 if not found.
1537 u8 drm_match_cea_mode(struct drm_display_mode *to_match)
1539 const struct drm_display_mode *cea_mode;
1542 for (mode = 0; mode < drm_num_cea_modes; mode++) {
1543 cea_mode = (const struct drm_display_mode *)&edid_cea_modes[mode];
1545 if (drm_mode_equal(to_match, cea_mode))
1550 EXPORT_SYMBOL(drm_match_cea_mode);
1554 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1556 struct drm_device *dev = connector->dev;
1557 u8 * mode, cea_mode;
1560 for (mode = db; mode < db + len; mode++) {
1561 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1562 if (cea_mode < drm_num_cea_modes) {
1563 struct drm_display_mode *newmode;
1564 newmode = drm_mode_duplicate(dev,
1565 &edid_cea_modes[cea_mode]);
1567 drm_mode_probed_add(connector, newmode);
1577 cea_db_payload_len(const u8 *db)
1579 return db[0] & 0x1f;
1583 cea_db_tag(const u8 *db)
1589 cea_revision(const u8 *cea)
1595 cea_db_offsets(const u8 *cea, int *start, int *end)
1597 /* Data block offset in CEA extension block */
1602 if (*end < 4 || *end > 127)
1607 #define for_each_cea_db(cea, i, start, end) \
1608 for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
1611 add_cea_modes(struct drm_connector *connector, struct edid *edid)
1613 u8 * cea = drm_find_cea_extension(edid);
1617 if (cea && cea_revision(cea) >= 3) {
1620 if (cea_db_offsets(cea, &start, &end))
1623 for_each_cea_db(cea, i, start, end) {
1625 dbl = cea_db_payload_len(db);
1627 if (cea_db_tag(db) == VIDEO_BLOCK)
1628 modes += do_cea_modes (connector, db+1, dbl);
1636 parse_hdmi_vsdb(struct drm_connector *connector, const u8 *db)
1638 u8 len = cea_db_payload_len(db);
1641 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1642 connector->dvi_dual = db[6] & 1;
1645 connector->max_tmds_clock = db[7] * 5;
1647 connector->latency_present[0] = db[8] >> 7;
1648 connector->latency_present[1] = (db[8] >> 6) & 1;
1651 connector->video_latency[0] = db[9];
1653 connector->audio_latency[0] = db[10];
1655 connector->video_latency[1] = db[11];
1657 connector->audio_latency[1] = db[12];
1659 DRM_DEBUG_KMS("HDMI: DVI dual %d, "
1660 "max TMDS clock %d, "
1661 "latency present %d %d, "
1662 "video latency %d %d, "
1663 "audio latency %d %d\n",
1664 connector->dvi_dual,
1665 connector->max_tmds_clock,
1666 (int) connector->latency_present[0],
1667 (int) connector->latency_present[1],
1668 connector->video_latency[0],
1669 connector->video_latency[1],
1670 connector->audio_latency[0],
1671 connector->audio_latency[1]);
1675 monitor_name(struct detailed_timing *t, void *data)
1677 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1678 *(u8 **)data = t->data.other_data.data.str.str;
1681 static bool cea_db_is_hdmi_vsdb(const u8 *db)
1685 if (cea_db_tag(db) != VENDOR_BLOCK)
1688 if (cea_db_payload_len(db) < 5)
1691 hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16);
1693 return hdmi_id == HDMI_IDENTIFIER;
1697 * drm_edid_to_eld - build ELD from EDID
1698 * @connector: connector corresponding to the HDMI/DP sink
1699 * @edid: EDID to parse
1701 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1702 * Some ELD fields are left to the graphics driver caller:
1707 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1709 uint8_t *eld = connector->eld;
1717 memset(eld, 0, sizeof(connector->eld));
1719 cea = drm_find_cea_extension(edid);
1721 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1726 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1727 for (mnl = 0; name && mnl < 13; mnl++) {
1728 if (name[mnl] == 0x0a)
1730 eld[20 + mnl] = name[mnl];
1732 eld[4] = (cea[1] << 5) | mnl;
1733 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1735 eld[0] = 2 << 3; /* ELD version: 2 */
1737 eld[16] = edid->mfg_id[0];
1738 eld[17] = edid->mfg_id[1];
1739 eld[18] = edid->prod_code[0];
1740 eld[19] = edid->prod_code[1];
1742 if (cea_revision(cea) >= 3) {
1745 if (cea_db_offsets(cea, &start, &end)) {
1750 for_each_cea_db(cea, i, start, end) {
1752 dbl = cea_db_payload_len(db);
1754 switch (cea_db_tag(db)) {
1756 /* Audio Data Block, contains SADs */
1757 sad_count = dbl / 3;
1759 memcpy(eld + 20 + mnl, &db[1], dbl);
1762 /* Speaker Allocation Data Block */
1767 /* HDMI Vendor-Specific Data Block */
1768 if (cea_db_is_hdmi_vsdb(db))
1769 parse_hdmi_vsdb(connector, db);
1776 eld[5] |= sad_count << 4;
1777 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1779 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1781 EXPORT_SYMBOL(drm_edid_to_eld);
1784 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1785 * @connector: connector associated with the HDMI/DP sink
1786 * @mode: the display mode
1788 int drm_av_sync_delay(struct drm_connector *connector,
1789 struct drm_display_mode *mode)
1791 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1794 if (!connector->latency_present[0])
1796 if (!connector->latency_present[1])
1799 a = connector->audio_latency[i];
1800 v = connector->video_latency[i];
1803 * HDMI/DP sink doesn't support audio or video?
1805 if (a == 255 || v == 255)
1809 * Convert raw EDID values to millisecond.
1810 * Treat unknown latency as 0ms.
1813 a = min(2 * (a - 1), 500);
1815 v = min(2 * (v - 1), 500);
1817 return max(v - a, 0);
1819 EXPORT_SYMBOL(drm_av_sync_delay);
1822 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1823 * @encoder: the encoder just changed display mode
1824 * @mode: the adjusted display mode
1826 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1827 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1829 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1830 struct drm_display_mode *mode)
1832 struct drm_connector *connector;
1833 struct drm_device *dev = encoder->dev;
1835 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1836 if (connector->encoder == encoder && connector->eld[0])
1841 EXPORT_SYMBOL(drm_select_eld);
1844 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1845 * @edid: monitor EDID information
1847 * Parse the CEA extension according to CEA-861-B.
1848 * Return true if HDMI, false if not or unknown.
1850 bool drm_detect_hdmi_monitor(struct edid *edid)
1854 int start_offset, end_offset;
1856 edid_ext = drm_find_cea_extension(edid);
1860 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1864 * Because HDMI identifier is in Vendor Specific Block,
1865 * search it from all data blocks of CEA extension.
1867 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1868 if (cea_db_is_hdmi_vsdb(&edid_ext[i]))
1874 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1877 * drm_detect_monitor_audio - check monitor audio capability
1879 * Monitor should have CEA extension block.
1880 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1881 * audio' only. If there is any audio extension block and supported
1882 * audio format, assume at least 'basic audio' support, even if 'basic
1883 * audio' is not defined in EDID.
1886 bool drm_detect_monitor_audio(struct edid *edid)
1890 bool has_audio = false;
1891 int start_offset, end_offset;
1893 edid_ext = drm_find_cea_extension(edid);
1897 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1900 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1904 if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
1907 for_each_cea_db(edid_ext, i, start_offset, end_offset) {
1908 if (cea_db_tag(&edid_ext[i]) == AUDIO_BLOCK) {
1910 for (j = 1; j < cea_db_payload_len(&edid_ext[i]) + 1; j += 3)
1911 DRM_DEBUG_KMS("CEA audio format %d\n",
1912 (edid_ext[i + j] >> 3) & 0xf);
1919 EXPORT_SYMBOL(drm_detect_monitor_audio);
1922 * drm_add_display_info - pull display info out if present
1924 * @info: display info (attached to connector)
1926 * Grab any available display info and stuff it into the drm_display_info
1927 * structure that's part of the connector. Useful for tracking bpp and
1930 static void drm_add_display_info(struct edid *edid,
1931 struct drm_display_info *info)
1935 info->width_mm = edid->width_cm * 10;
1936 info->height_mm = edid->height_cm * 10;
1938 /* driver figures it out in this case */
1940 info->color_formats = 0;
1942 if (edid->revision < 3)
1945 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1948 /* Get data from CEA blocks if present */
1949 edid_ext = drm_find_cea_extension(edid);
1951 info->cea_rev = edid_ext[1];
1953 /* The existence of a CEA block should imply RGB support */
1954 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1955 if (edid_ext[3] & EDID_CEA_YCRCB444)
1956 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1957 if (edid_ext[3] & EDID_CEA_YCRCB422)
1958 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1961 /* Only defined for 1.4 with digital displays */
1962 if (edid->revision < 4)
1965 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1966 case DRM_EDID_DIGITAL_DEPTH_6:
1969 case DRM_EDID_DIGITAL_DEPTH_8:
1972 case DRM_EDID_DIGITAL_DEPTH_10:
1975 case DRM_EDID_DIGITAL_DEPTH_12:
1978 case DRM_EDID_DIGITAL_DEPTH_14:
1981 case DRM_EDID_DIGITAL_DEPTH_16:
1984 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1990 info->color_formats |= DRM_COLOR_FORMAT_RGB444;
1991 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
1992 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1993 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
1994 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1998 * drm_add_edid_modes - add modes from EDID data, if available
1999 * @connector: connector we're probing
2002 * Add the specified modes to the connector's mode list.
2004 * Return number of modes added or 0 if we couldn't find any.
2006 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
2014 if (!drm_edid_is_valid(edid)) {
2015 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
2016 drm_get_connector_name(connector));
2020 quirks = edid_get_quirks(edid);
2023 * EDID spec says modes should be preferred in this order:
2024 * - preferred detailed mode
2025 * - other detailed modes from base block
2026 * - detailed modes from extension blocks
2027 * - CVT 3-byte code modes
2028 * - standard timing codes
2029 * - established timing codes
2030 * - modes inferred from GTF or CVT range information
2032 * We get this pretty much right.
2034 * XXX order for additional mode types in extension blocks?
2036 num_modes += add_detailed_modes(connector, edid, quirks);
2037 num_modes += add_cvt_modes(connector, edid);
2038 num_modes += add_standard_modes(connector, edid);
2039 num_modes += add_established_modes(connector, edid);
2040 if (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)
2041 num_modes += add_inferred_modes(connector, edid);
2042 num_modes += add_cea_modes(connector, edid);
2044 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
2045 edid_fixup_preferred(connector, quirks);
2047 drm_add_display_info(edid, &connector->display_info);
2051 EXPORT_SYMBOL(drm_add_edid_modes);
2054 * drm_add_modes_noedid - add modes for the connectors without EDID
2055 * @connector: connector we're probing
2056 * @hdisplay: the horizontal display limit
2057 * @vdisplay: the vertical display limit
2059 * Add the specified modes to the connector's mode list. Only when the
2060 * hdisplay/vdisplay is not beyond the given limit, it will be added.
2062 * Return number of modes added or 0 if we couldn't find any.
2064 int drm_add_modes_noedid(struct drm_connector *connector,
2065 int hdisplay, int vdisplay)
2067 int i, count, num_modes = 0;
2068 struct drm_display_mode *mode;
2069 struct drm_device *dev = connector->dev;
2071 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
2077 for (i = 0; i < count; i++) {
2078 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
2079 if (hdisplay && vdisplay) {
2081 * Only when two are valid, they will be used to check
2082 * whether the mode should be added to the mode list of
2085 if (ptr->hdisplay > hdisplay ||
2086 ptr->vdisplay > vdisplay)
2089 if (drm_mode_vrefresh(ptr) > 61)
2091 mode = drm_mode_duplicate(dev, ptr);
2093 drm_mode_probed_add(connector, mode);
2099 EXPORT_SYMBOL(drm_add_modes_noedid);
2102 * drm_mode_cea_vic - return the CEA-861 VIC of a given mode
2106 * The VIC number, 0 in case it's not a CEA-861 mode.
2108 uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode)
2112 for (i = 0; i < drm_num_cea_modes; i++)
2113 if (drm_mode_equal(mode, &edid_cea_modes[i]))
2118 EXPORT_SYMBOL(drm_mode_cea_vic);