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 * $FreeBSD: head/sys/dev/drm2/drm_edid.c 249041 2013-04-03 08:27:35Z dumbbell $
33 #include <linux/export.h>
35 #include <drm/drm_crtc.h>
36 #include <drm/drm_edid.h>
37 #include "drm_edid_modes.h"
38 #include <bus/iicbus/iic.h>
39 #include <bus/iicbus/iiconf.h>
40 #include "iicbus_if.h"
42 #define version_greater(edid, maj, min) \
43 (((edid)->version > (maj)) || \
44 ((edid)->version == (maj) && (edid)->revision > (min)))
46 #define EDID_EST_TIMINGS 16
47 #define EDID_STD_TIMINGS 8
48 #define EDID_DETAILED_TIMINGS 4
51 * EDID blocks out in the wild have a variety of bugs, try to collect
52 * them here (note that userspace may work around broken monitors first,
53 * but fixes should make their way here so that the kernel "just works"
54 * on as many displays as possible).
57 /* First detailed mode wrong, use largest 60Hz mode */
58 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
59 /* Reported 135MHz pixel clock is too high, needs adjustment */
60 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
61 /* Prefer the largest mode at 75 Hz */
62 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
63 /* Detail timing is in cm not mm */
64 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
65 /* Detailed timing descriptors have bogus size values, so just take the
66 * maximum size and use that.
68 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
69 /* Monitor forgot to set the first detailed is preferred bit. */
70 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
71 /* use +hsync +vsync for detailed mode */
72 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
74 struct detailed_mode_closure {
75 struct drm_connector *connector;
87 static struct edid_quirk {
91 } edid_quirk_list[] = {
93 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
95 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
97 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
99 /* Belinea 10 15 55 */
100 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
101 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
103 /* Envision Peripherals, Inc. EN-7100e */
104 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
105 /* Envision EN2028 */
106 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
108 /* Funai Electronics PM36B */
109 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
110 EDID_QUIRK_DETAILED_IN_CM },
112 /* LG Philips LCD LP154W01-A5 */
113 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
114 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
116 /* Philips 107p5 CRT */
117 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
120 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
122 /* Samsung SyncMaster 205BW. Note: irony */
123 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
124 /* Samsung SyncMaster 22[5-6]BW */
125 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
126 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
129 /*** DDC fetch and block validation ***/
131 static const u8 edid_header[] = {
132 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
136 * Sanity check the header of the base EDID block. Return 8 if the header
137 * is perfect, down to 0 if it's totally wrong.
139 int drm_edid_header_is_valid(const u8 *raw_edid)
143 for (i = 0; i < sizeof(edid_header); i++)
144 if (raw_edid[i] == edid_header[i])
149 EXPORT_SYMBOL(drm_edid_header_is_valid);
151 static int edid_fixup __read_mostly = 6;
154 * Sanity check the EDID block (base or extension). Return 0 if the block
155 * doesn't check out, or 1 if it's valid.
157 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
161 struct edid *edid = (struct edid *)raw_edid;
163 if (edid_fixup > 8 || edid_fixup < 0)
167 int score = drm_edid_header_is_valid(raw_edid);
169 else if (score >= edid_fixup) {
170 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
171 memcpy(raw_edid, edid_header, sizeof(edid_header));
177 for (i = 0; i < EDID_LENGTH; i++)
180 if (print_bad_edid) {
181 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
184 /* allow CEA to slide through, switches mangle this */
185 if (raw_edid[0] != 0x02)
189 /* per-block-type checks */
190 switch (raw_edid[0]) {
192 if (edid->version != 1) {
193 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
197 if (edid->revision > 4)
198 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
208 if (raw_edid && print_bad_edid) {
209 DRM_DEBUG_KMS("Raw EDID:\n");
210 if ((drm_debug & DRM_DEBUGBITS_KMS) != 0) {
211 for (i = 0; i < EDID_LENGTH; ) {
212 kprintf("%02x", raw_edid[i]);
214 if (i % 16 == 0 || i == EDID_LENGTH)
225 EXPORT_SYMBOL(drm_edid_block_valid);
228 * drm_edid_is_valid - sanity check EDID data
231 * Sanity-check an entire EDID record (including extensions)
233 bool drm_edid_is_valid(struct edid *edid)
236 u8 *raw = (u8 *)edid;
241 for (i = 0; i <= edid->extensions; i++)
242 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true))
247 EXPORT_SYMBOL(drm_edid_is_valid);
249 #define DDC_ADDR 0x50
250 #define DDC_SEGMENT_ADDR 0x30
252 * Get EDID information via I2C.
254 * \param adapter : i2c device adaptor
255 * \param buf : EDID data buffer to be filled
256 * \param len : EDID data buffer length
257 * \return 0 on success or -1 on failure.
259 * Try to fetch EDID information by calling i2c driver function.
262 drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf,
265 unsigned char start = block * EDID_LENGTH;
266 unsigned char segment = block >> 1;
267 unsigned char xfers = segment ? 3 : 2;
268 int ret, retries = 5;
270 /* The core i2c driver will automatically retry the transfer if the
271 * adapter reports EAGAIN. However, we find that bit-banging transfers
272 * are susceptible to errors under a heavily loaded machine and
273 * generate spurious NAKs and timeouts. Retrying the transfer
274 * of the individual block a few times seems to overcome this.
277 struct iic_msg msgs[] = {
279 .slave = DDC_SEGMENT_ADDR << 1,
284 .slave = DDC_ADDR << 1,
289 .slave = DDC_ADDR << 1,
297 * Avoid sending the segment addr to not upset non-compliant ddc
300 ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers);
303 DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n",
305 } while (ret != 0 && --retries);
307 return (ret == 0 ? 0 : -1);
310 static bool drm_edid_is_zero(u8 *in_edid, int length)
313 u32 *raw_edid = (u32 *)in_edid;
315 for (i = 0; i < length / 4; i++)
316 if (*(raw_edid + i) != 0)
322 drm_do_get_edid(struct drm_connector *connector, device_t adapter)
324 int i, j = 0, valid_extensions = 0;
326 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
328 block = kmalloc(EDID_LENGTH, DRM_MEM_KMS, M_WAITOK | M_ZERO);
330 /* base block fetch */
331 for (i = 0; i < 4; i++) {
332 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
334 if (drm_edid_block_valid(block, 0, print_bad_edid))
336 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
337 connector->null_edid_counter++;
344 /* if there's no extensions, we're done */
345 if (block[0x7e] == 0)
348 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, DRM_MEM_KMS,
354 for (j = 1; j <= block[0x7e]; j++) {
355 for (i = 0; i < 4; i++) {
356 if (drm_do_probe_ddc_edid(adapter,
357 block + (valid_extensions + 1) * EDID_LENGTH,
360 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j, print_bad_edid)) {
366 dev_warn(connector->dev->dev,
367 "%s: Ignoring invalid EDID block %d.\n",
368 drm_get_connector_name(connector), j);
371 if (valid_extensions != block[0x7e]) {
372 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
373 block[0x7e] = valid_extensions;
374 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH,
375 DRM_MEM_KMS, M_WAITOK);
384 if (print_bad_edid) {
385 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
386 drm_get_connector_name(connector), j);
388 connector->bad_edid_counter++;
391 kfree(block, DRM_MEM_KMS);
396 * Probe DDC presence.
398 * \param adapter : i2c device adaptor
399 * \return 1 on success
402 drm_probe_ddc(device_t adapter)
406 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
408 EXPORT_SYMBOL(drm_probe_ddc);
411 * drm_get_edid - get EDID data, if available
412 * @connector: connector we're probing
413 * @adapter: i2c adapter to use for DDC
415 * Poke the given i2c channel to grab EDID data if possible. If found,
416 * attach it to the connector.
418 * Return edid data or NULL if we couldn't find any.
420 struct edid *drm_get_edid(struct drm_connector *connector,
423 struct edid *edid = NULL;
425 if (drm_probe_ddc(adapter))
426 edid = (struct edid *)drm_do_get_edid(connector, adapter);
430 EXPORT_SYMBOL(drm_get_edid);
432 /*** EDID parsing ***/
435 * edid_vendor - match a string against EDID's obfuscated vendor field
436 * @edid: EDID to match
437 * @vendor: vendor string
439 * Returns true if @vendor is in @edid, false otherwise
441 static bool edid_vendor(struct edid *edid, char *vendor)
445 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
446 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
447 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
448 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
450 return !strncmp(edid_vendor, vendor, 3);
454 * edid_get_quirks - return quirk flags for a given EDID
455 * @edid: EDID to process
457 * This tells subsequent routines what fixes they need to apply.
459 static u32 edid_get_quirks(struct edid *edid)
461 struct edid_quirk *quirk;
464 for (i = 0; i < DRM_ARRAY_SIZE(edid_quirk_list); i++) {
465 quirk = &edid_quirk_list[i];
467 if (edid_vendor(edid, quirk->vendor) &&
468 (EDID_PRODUCT_ID(edid) == quirk->product_id))
469 return quirk->quirks;
475 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
476 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
479 * edid_fixup_preferred - set preferred modes based on quirk list
480 * @connector: has mode list to fix up
481 * @quirks: quirks list
483 * Walk the mode list for @connector, clearing the preferred status
484 * on existing modes and setting it anew for the right mode ala @quirks.
486 static void edid_fixup_preferred(struct drm_connector *connector,
489 struct drm_display_mode *t, *cur_mode, *preferred_mode;
490 int target_refresh = 0;
492 if (list_empty(&connector->probed_modes))
495 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
497 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
500 preferred_mode = list_first_entry(&connector->probed_modes,
501 struct drm_display_mode, head);
503 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
504 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
506 if (cur_mode == preferred_mode)
509 /* Largest mode is preferred */
510 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
511 preferred_mode = cur_mode;
513 /* At a given size, try to get closest to target refresh */
514 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
515 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
516 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
517 preferred_mode = cur_mode;
521 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
525 mode_is_rb(const struct drm_display_mode *mode)
527 return (mode->htotal - mode->hdisplay == 160) &&
528 (mode->hsync_end - mode->hdisplay == 80) &&
529 (mode->hsync_end - mode->hsync_start == 32) &&
530 (mode->vsync_start - mode->vdisplay == 3);
534 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
535 * @dev: Device to duplicate against
537 * @vsize: Mode height
538 * @fresh: Mode refresh rate
539 * @rb: Mode reduced-blanking-ness
541 * Walk the DMT mode list looking for a match for the given parameters.
542 * Return a newly allocated copy of the mode, or NULL if not found.
544 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
545 int hsize, int vsize, int fresh,
550 for (i = 0; i < drm_num_dmt_modes; i++) {
551 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
552 if (hsize != ptr->hdisplay)
554 if (vsize != ptr->vdisplay)
556 if (fresh != drm_mode_vrefresh(ptr))
558 if (rb != mode_is_rb(ptr))
561 return drm_mode_duplicate(dev, ptr);
566 EXPORT_SYMBOL(drm_mode_find_dmt);
568 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
571 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
575 u8 *det_base = ext + d;
578 for (i = 0; i < n; i++)
579 cb((struct detailed_timing *)(det_base + 18 * i), closure);
583 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
585 unsigned int i, n = min((int)ext[0x02], 6);
586 u8 *det_base = ext + 5;
589 return; /* unknown version */
591 for (i = 0; i < n; i++)
592 cb((struct detailed_timing *)(det_base + 18 * i), closure);
596 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
599 struct edid *edid = (struct edid *)raw_edid;
604 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
605 cb(&(edid->detailed_timings[i]), closure);
607 for (i = 1; i <= raw_edid[0x7e]; i++) {
608 u8 *ext = raw_edid + (i * EDID_LENGTH);
611 cea_for_each_detailed_block(ext, cb, closure);
614 vtb_for_each_detailed_block(ext, cb, closure);
623 is_rb(struct detailed_timing *t, void *data)
626 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
628 *(bool *)data = true;
631 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
633 drm_monitor_supports_rb(struct edid *edid)
635 if (edid->revision >= 4) {
637 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
641 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
645 find_gtf2(struct detailed_timing *t, void *data)
648 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
652 /* Secondary GTF curve kicks in above some break frequency */
654 drm_gtf2_hbreak(struct edid *edid)
657 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
658 return r ? (r[12] * 2) : 0;
662 drm_gtf2_2c(struct edid *edid)
665 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
666 return r ? r[13] : 0;
670 drm_gtf2_m(struct edid *edid)
673 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
674 return r ? (r[15] << 8) + r[14] : 0;
678 drm_gtf2_k(struct edid *edid)
681 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
682 return r ? r[16] : 0;
686 drm_gtf2_2j(struct edid *edid)
689 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
690 return r ? r[17] : 0;
694 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
695 * @edid: EDID block to scan
697 static int standard_timing_level(struct edid *edid)
699 if (edid->revision >= 2) {
700 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
702 if (drm_gtf2_hbreak(edid))
710 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
711 * monitors fill with ascii space (0x20) instead.
714 bad_std_timing(u8 a, u8 b)
716 return (a == 0x00 && b == 0x00) ||
717 (a == 0x01 && b == 0x01) ||
718 (a == 0x20 && b == 0x20);
722 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
723 * @t: standard timing params
724 * @timing_level: standard timing level
726 * Take the standard timing params (in this case width, aspect, and refresh)
727 * and convert them into a real mode using CVT/GTF/DMT.
729 static struct drm_display_mode *
730 drm_mode_std(struct drm_connector *connector, struct edid *edid,
731 struct std_timing *t, int revision)
733 struct drm_device *dev = connector->dev;
734 struct drm_display_mode *m, *mode = NULL;
737 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
738 >> EDID_TIMING_ASPECT_SHIFT;
739 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
740 >> EDID_TIMING_VFREQ_SHIFT;
741 int timing_level = standard_timing_level(edid);
743 if (bad_std_timing(t->hsize, t->vfreq_aspect))
746 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
747 hsize = t->hsize * 8 + 248;
748 /* vrefresh_rate = vfreq + 60 */
749 vrefresh_rate = vfreq + 60;
750 /* the vdisplay is calculated based on the aspect ratio */
751 if (aspect_ratio == 0) {
755 vsize = (hsize * 10) / 16;
756 } else if (aspect_ratio == 1)
757 vsize = (hsize * 3) / 4;
758 else if (aspect_ratio == 2)
759 vsize = (hsize * 4) / 5;
761 vsize = (hsize * 9) / 16;
763 /* HDTV hack, part 1 */
764 if (vrefresh_rate == 60 &&
765 ((hsize == 1360 && vsize == 765) ||
766 (hsize == 1368 && vsize == 769))) {
772 * If this connector already has a mode for this size and refresh
773 * rate (because it came from detailed or CVT info), use that
774 * instead. This way we don't have to guess at interlace or
777 list_for_each_entry(m, &connector->probed_modes, head)
778 if (m->hdisplay == hsize && m->vdisplay == vsize &&
779 drm_mode_vrefresh(m) == vrefresh_rate)
782 /* HDTV hack, part 2 */
783 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
784 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
786 mode->hdisplay = 1366;
787 mode->hsync_start = mode->hsync_start - 1;
788 mode->hsync_end = mode->hsync_end - 1;
792 /* check whether it can be found in default mode table */
793 if (drm_monitor_supports_rb(edid)) {
794 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
799 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
803 /* okay, generate it */
804 switch (timing_level) {
808 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
812 * This is potentially wrong if there's ever a monitor with
813 * more than one ranges section, each claiming a different
814 * secondary GTF curve. Please don't do that.
816 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
819 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
820 drm_mode_destroy(dev, mode);
821 mode = drm_gtf_mode_complex(dev, hsize, vsize,
830 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
838 * EDID is delightfully ambiguous about how interlaced modes are to be
839 * encoded. Our internal representation is of frame height, but some
840 * HDTV detailed timings are encoded as field height.
842 * The format list here is from CEA, in frame size. Technically we
843 * should be checking refresh rate too. Whatever.
846 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
847 struct detailed_pixel_timing *pt)
850 static const struct {
852 } cea_interlaced[] = {
862 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
865 for (i = 0; i < DRM_ARRAY_SIZE(cea_interlaced); i++) {
866 if ((mode->hdisplay == cea_interlaced[i].w) &&
867 (mode->vdisplay == cea_interlaced[i].h / 2)) {
869 mode->vsync_start *= 2;
870 mode->vsync_end *= 2;
876 mode->flags |= DRM_MODE_FLAG_INTERLACE;
880 * drm_mode_detailed - create a new mode from an EDID detailed timing section
881 * @dev: DRM device (needed to create new mode)
883 * @timing: EDID detailed timing info
884 * @quirks: quirks to apply
886 * An EDID detailed timing block contains enough info for us to create and
887 * return a new struct drm_display_mode.
889 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
891 struct detailed_timing *timing,
894 struct drm_display_mode *mode;
895 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
896 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
897 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
898 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
899 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
900 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
901 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
902 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
903 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
905 /* ignore tiny modes */
906 if (hactive < 64 || vactive < 64)
909 if (pt->misc & DRM_EDID_PT_STEREO) {
910 kprintf("stereo mode not supported\n");
913 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
914 kprintf("composite sync not supported\n");
917 /* it is incorrect if hsync/vsync width is zero */
918 if (!hsync_pulse_width || !vsync_pulse_width) {
919 DRM_DEBUG_KMS("Incorrect Detailed timing. "
920 "Wrong Hsync/Vsync pulse width\n");
923 mode = drm_mode_create(dev);
927 mode->type = DRM_MODE_TYPE_DRIVER;
929 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
930 timing->pixel_clock = htole16(1088);
932 mode->clock = le16toh(timing->pixel_clock) * 10;
934 mode->hdisplay = hactive;
935 mode->hsync_start = mode->hdisplay + hsync_offset;
936 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
937 mode->htotal = mode->hdisplay + hblank;
939 mode->vdisplay = vactive;
940 mode->vsync_start = mode->vdisplay + vsync_offset;
941 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
942 mode->vtotal = mode->vdisplay + vblank;
944 /* Some EDIDs have bogus h/vtotal values */
945 if (mode->hsync_end > mode->htotal)
946 mode->htotal = mode->hsync_end + 1;
947 if (mode->vsync_end > mode->vtotal)
948 mode->vtotal = mode->vsync_end + 1;
950 drm_mode_do_interlace_quirk(mode, pt);
952 drm_mode_set_name(mode);
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;
963 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
964 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
966 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
967 mode->width_mm *= 10;
968 mode->height_mm *= 10;
971 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
972 mode->width_mm = edid->width_cm * 10;
973 mode->height_mm = edid->height_cm * 10;
980 mode_in_hsync_range(const struct drm_display_mode *mode,
981 struct edid *edid, u8 *t)
983 int hsync, hmin, hmax;
986 if (edid->revision >= 4)
987 hmin += ((t[4] & 0x04) ? 255 : 0);
989 if (edid->revision >= 4)
990 hmax += ((t[4] & 0x08) ? 255 : 0);
991 hsync = drm_mode_hsync(mode);
993 return (hsync <= hmax && hsync >= hmin);
997 mode_in_vsync_range(const struct drm_display_mode *mode,
998 struct edid *edid, u8 *t)
1000 int vsync, vmin, vmax;
1003 if (edid->revision >= 4)
1004 vmin += ((t[4] & 0x01) ? 255 : 0);
1006 if (edid->revision >= 4)
1007 vmax += ((t[4] & 0x02) ? 255 : 0);
1008 vsync = drm_mode_vrefresh(mode);
1010 return (vsync <= vmax && vsync >= vmin);
1014 range_pixel_clock(struct edid *edid, u8 *t)
1017 if (t[9] == 0 || t[9] == 255)
1020 /* 1.4 with CVT support gives us real precision, yay */
1021 if (edid->revision >= 4 && t[10] == 0x04)
1022 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1024 /* 1.3 is pathetic, so fuzz up a bit */
1025 return t[9] * 10000 + 5001;
1029 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1030 struct detailed_timing *timing)
1033 u8 *t = (u8 *)timing;
1035 if (!mode_in_hsync_range(mode, edid, t))
1038 if (!mode_in_vsync_range(mode, edid, t))
1041 if ((max_clock = range_pixel_clock(edid, t)))
1042 if (mode->clock > max_clock)
1045 /* 1.4 max horizontal check */
1046 if (edid->revision >= 4 && t[10] == 0x04)
1047 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1050 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1057 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
1058 * need to account for them.
1061 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1062 struct detailed_timing *timing)
1065 struct drm_display_mode *newmode;
1066 struct drm_device *dev = connector->dev;
1068 for (i = 0; i < drm_num_dmt_modes; i++) {
1069 if (mode_in_range(drm_dmt_modes + i, edid, timing)) {
1070 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1072 drm_mode_probed_add(connector, newmode);
1082 do_inferred_modes(struct detailed_timing *timing, void *c)
1084 struct detailed_mode_closure *closure = c;
1085 struct detailed_non_pixel *data = &timing->data.other_data;
1086 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF);
1088 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE)
1089 closure->modes += drm_gtf_modes_for_range(closure->connector,
1095 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1097 struct detailed_mode_closure closure = {
1098 connector, edid, 0, 0, 0
1101 if (version_greater(edid, 1, 0))
1102 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1105 return closure.modes;
1109 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1111 int i, j, m, modes = 0;
1112 struct drm_display_mode *mode;
1113 u8 *est = ((u8 *)timing) + 5;
1115 for (i = 0; i < 6; i++) {
1116 for (j = 7; j > 0; j--) {
1117 m = (i * 8) + (7 - j);
1118 if (m >= ARRAY_SIZE(est3_modes))
1120 if (est[i] & (1 << j)) {
1121 mode = drm_mode_find_dmt(connector->dev,
1127 drm_mode_probed_add(connector, mode);
1138 do_established_modes(struct detailed_timing *timing, void *c)
1140 struct detailed_mode_closure *closure = c;
1141 struct detailed_non_pixel *data = &timing->data.other_data;
1143 if (data->type == EDID_DETAIL_EST_TIMINGS)
1144 closure->modes += drm_est3_modes(closure->connector, timing);
1148 * add_established_modes - get est. modes from EDID and add them
1149 * @edid: EDID block to scan
1151 * Each EDID block contains a bitmap of the supported "established modes" list
1152 * (defined above). Tease them out and add them to the global modes list.
1155 add_established_modes(struct drm_connector *connector, struct edid *edid)
1157 struct drm_device *dev = connector->dev;
1158 unsigned long est_bits = edid->established_timings.t1 |
1159 (edid->established_timings.t2 << 8) |
1160 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1162 struct detailed_mode_closure closure = {
1163 connector, edid, 0, 0, 0
1166 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1167 if (est_bits & (1<<i)) {
1168 struct drm_display_mode *newmode;
1169 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1171 drm_mode_probed_add(connector, newmode);
1177 if (version_greater(edid, 1, 0))
1178 drm_for_each_detailed_block((u8 *)edid,
1179 do_established_modes, &closure);
1181 return modes + closure.modes;
1185 do_standard_modes(struct detailed_timing *timing, void *c)
1187 struct detailed_mode_closure *closure = c;
1188 struct detailed_non_pixel *data = &timing->data.other_data;
1189 struct drm_connector *connector = closure->connector;
1190 struct edid *edid = closure->edid;
1192 if (data->type == EDID_DETAIL_STD_MODES) {
1194 for (i = 0; i < 6; i++) {
1195 struct std_timing *std;
1196 struct drm_display_mode *newmode;
1198 std = &data->data.timings[i];
1199 newmode = drm_mode_std(connector, edid, std,
1202 drm_mode_probed_add(connector, newmode);
1210 * add_standard_modes - get std. modes from EDID and add them
1211 * @edid: EDID block to scan
1213 * Standard modes can be calculated using the appropriate standard (DMT,
1214 * GTF or CVT. Grab them from @edid and add them to the list.
1217 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1220 struct detailed_mode_closure closure = {
1221 connector, edid, 0, 0, 0
1224 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1225 struct drm_display_mode *newmode;
1227 newmode = drm_mode_std(connector, edid,
1228 &edid->standard_timings[i],
1231 drm_mode_probed_add(connector, newmode);
1236 if (version_greater(edid, 1, 0))
1237 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1240 /* XXX should also look for standard codes in VTB blocks */
1242 return modes + closure.modes;
1245 static int drm_cvt_modes(struct drm_connector *connector,
1246 struct detailed_timing *timing)
1248 int i, j, modes = 0;
1249 struct drm_display_mode *newmode;
1250 struct drm_device *dev = connector->dev;
1251 struct cvt_timing *cvt;
1252 const int rates[] = { 60, 85, 75, 60, 50 };
1253 const u8 empty[3] = { 0, 0, 0 };
1255 for (i = 0; i < 4; i++) {
1256 int width = 0, height;
1257 cvt = &(timing->data.other_data.data.cvt[i]);
1259 if (!memcmp(cvt->code, empty, 3))
1262 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1263 switch (cvt->code[1] & 0x0c) {
1265 width = height * 4 / 3;
1268 width = height * 16 / 9;
1271 width = height * 16 / 10;
1274 width = height * 15 / 9;
1278 for (j = 1; j < 5; j++) {
1279 if (cvt->code[2] & (1 << j)) {
1280 newmode = drm_cvt_mode(dev, width, height,
1284 drm_mode_probed_add(connector, newmode);
1295 do_cvt_mode(struct detailed_timing *timing, void *c)
1297 struct detailed_mode_closure *closure = c;
1298 struct detailed_non_pixel *data = &timing->data.other_data;
1300 if (data->type == EDID_DETAIL_CVT_3BYTE)
1301 closure->modes += drm_cvt_modes(closure->connector, timing);
1305 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1307 struct detailed_mode_closure closure = {
1308 connector, edid, 0, 0, 0
1311 if (version_greater(edid, 1, 2))
1312 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1314 /* XXX should also look for CVT codes in VTB blocks */
1316 return closure.modes;
1320 do_detailed_mode(struct detailed_timing *timing, void *c)
1322 struct detailed_mode_closure *closure = c;
1323 struct drm_display_mode *newmode;
1325 if (timing->pixel_clock) {
1326 newmode = drm_mode_detailed(closure->connector->dev,
1327 closure->edid, timing,
1332 if (closure->preferred)
1333 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1335 drm_mode_probed_add(closure->connector, newmode);
1337 closure->preferred = 0;
1342 * add_detailed_modes - Add modes from detailed timings
1343 * @connector: attached connector
1344 * @edid: EDID block to scan
1345 * @quirks: quirks to apply
1348 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1351 struct detailed_mode_closure closure = {
1359 if (closure.preferred && !version_greater(edid, 1, 3))
1361 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1363 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1365 return closure.modes;
1368 #define HDMI_IDENTIFIER 0x000C03
1369 #define AUDIO_BLOCK 0x01
1370 #define VENDOR_BLOCK 0x03
1371 #define SPEAKER_BLOCK 0x04
1372 #define EDID_BASIC_AUDIO (1 << 6)
1375 * Search EDID for CEA extension block.
1377 u8 *drm_find_cea_extension(struct edid *edid)
1379 u8 *edid_ext = NULL;
1382 /* No EDID or EDID extensions */
1383 if (edid == NULL || edid->extensions == 0)
1386 /* Find CEA extension */
1387 for (i = 0; i < edid->extensions; i++) {
1388 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1389 if (edid_ext[0] == CEA_EXT)
1393 if (i == edid->extensions)
1398 EXPORT_SYMBOL(drm_find_cea_extension);
1401 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db)
1403 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1405 connector->dvi_dual = db[6] & 1;
1406 connector->max_tmds_clock = db[7] * 5;
1408 connector->latency_present[0] = db[8] >> 7;
1409 connector->latency_present[1] = (db[8] >> 6) & 1;
1410 connector->video_latency[0] = db[9];
1411 connector->audio_latency[0] = db[10];
1412 connector->video_latency[1] = db[11];
1413 connector->audio_latency[1] = db[12];
1415 DRM_DEBUG_KMS("HDMI: DVI dual %d, "
1416 "max TMDS clock %d, "
1417 "latency present %d %d, "
1418 "video latency %d %d, "
1419 "audio latency %d %d\n",
1420 connector->dvi_dual,
1421 connector->max_tmds_clock,
1422 (int) connector->latency_present[0],
1423 (int) connector->latency_present[1],
1424 connector->video_latency[0],
1425 connector->video_latency[1],
1426 connector->audio_latency[0],
1427 connector->audio_latency[1]);
1431 monitor_name(struct detailed_timing *t, void *data)
1433 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1434 *(u8 **)data = t->data.other_data.data.str.str;
1438 * drm_edid_to_eld - build ELD from EDID
1439 * @connector: connector corresponding to the HDMI/DP sink
1440 * @edid: EDID to parse
1442 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1443 * Some ELD fields are left to the graphics driver caller:
1448 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1450 uint8_t *eld = connector->eld;
1458 memset(eld, 0, sizeof(connector->eld));
1460 cea = drm_find_cea_extension(edid);
1462 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1467 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1468 for (mnl = 0; name && mnl < 13; mnl++) {
1469 if (name[mnl] == 0x0a)
1471 eld[20 + mnl] = name[mnl];
1473 eld[4] = (cea[1] << 5) | mnl;
1474 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1476 eld[0] = 2 << 3; /* ELD version: 2 */
1478 eld[16] = edid->mfg_id[0];
1479 eld[17] = edid->mfg_id[1];
1480 eld[18] = edid->prod_code[0];
1481 eld[19] = edid->prod_code[1];
1483 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1486 switch ((db[0] & 0xe0) >> 5) {
1487 case AUDIO_BLOCK: /* Audio Data Block, contains SADs */
1488 sad_count = dbl / 3;
1489 memcpy(eld + 20 + mnl, &db[1], dbl);
1491 case SPEAKER_BLOCK: /* Speaker Allocation Data Block */
1495 /* HDMI Vendor-Specific Data Block */
1496 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0)
1497 parse_hdmi_vsdb(connector, db);
1503 eld[5] |= sad_count << 4;
1504 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1506 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1510 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1511 * @connector: connector associated with the HDMI/DP sink
1512 * @mode: the display mode
1514 int drm_av_sync_delay(struct drm_connector *connector,
1515 struct drm_display_mode *mode)
1517 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1520 if (!connector->latency_present[0])
1522 if (!connector->latency_present[1])
1525 a = connector->audio_latency[i];
1526 v = connector->video_latency[i];
1529 * HDMI/DP sink doesn't support audio or video?
1531 if (a == 255 || v == 255)
1535 * Convert raw EDID values to millisecond.
1536 * Treat unknown latency as 0ms.
1539 a = min(2 * (a - 1), 500);
1541 v = min(2 * (v - 1), 500);
1543 return max(v - a, 0);
1547 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1548 * @encoder: the encoder just changed display mode
1549 * @mode: the adjusted display mode
1551 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1552 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1554 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1555 struct drm_display_mode *mode)
1557 struct drm_connector *connector;
1558 struct drm_device *dev = encoder->dev;
1560 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1561 if (connector->encoder == encoder && connector->eld[0])
1568 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1569 * @edid: monitor EDID information
1571 * Parse the CEA extension according to CEA-861-B.
1572 * Return true if HDMI, false if not or unknown.
1574 bool drm_detect_hdmi_monitor(struct edid *edid)
1578 int start_offset, end_offset;
1579 bool is_hdmi = false;
1581 edid_ext = drm_find_cea_extension(edid);
1585 /* Data block offset in CEA extension block */
1587 end_offset = edid_ext[2];
1590 * Because HDMI identifier is in Vendor Specific Block,
1591 * search it from all data blocks of CEA extension.
1593 for (i = start_offset; i < end_offset;
1594 /* Increased by data block len */
1595 i += ((edid_ext[i] & 0x1f) + 1)) {
1596 /* Find vendor specific block */
1597 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1598 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1599 edid_ext[i + 3] << 16;
1600 /* Find HDMI identifier */
1601 if (hdmi_id == HDMI_IDENTIFIER)
1612 * drm_detect_monitor_audio - check monitor audio capability
1614 * Monitor should have CEA extension block.
1615 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1616 * audio' only. If there is any audio extension block and supported
1617 * audio format, assume at least 'basic audio' support, even if 'basic
1618 * audio' is not defined in EDID.
1621 bool drm_detect_monitor_audio(struct edid *edid)
1625 bool has_audio = false;
1626 int start_offset, end_offset;
1628 edid_ext = drm_find_cea_extension(edid);
1632 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1635 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1639 /* Data block offset in CEA extension block */
1641 end_offset = edid_ext[2];
1643 for (i = start_offset; i < end_offset;
1644 i += ((edid_ext[i] & 0x1f) + 1)) {
1645 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1647 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1648 DRM_DEBUG_KMS("CEA audio format %d\n",
1649 (edid_ext[i + j] >> 3) & 0xf);
1658 * drm_add_display_info - pull display info out if present
1660 * @info: display info (attached to connector)
1662 * Grab any available display info and stuff it into the drm_display_info
1663 * structure that's part of the connector. Useful for tracking bpp and
1666 static void drm_add_display_info(struct edid *edid,
1667 struct drm_display_info *info)
1671 info->width_mm = edid->width_cm * 10;
1672 info->height_mm = edid->height_cm * 10;
1674 /* driver figures it out in this case */
1676 info->color_formats = 0;
1678 /* Only defined for 1.4 with digital displays */
1679 if (edid->revision < 4)
1682 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1685 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1686 case DRM_EDID_DIGITAL_DEPTH_6:
1689 case DRM_EDID_DIGITAL_DEPTH_8:
1692 case DRM_EDID_DIGITAL_DEPTH_10:
1695 case DRM_EDID_DIGITAL_DEPTH_12:
1698 case DRM_EDID_DIGITAL_DEPTH_14:
1701 case DRM_EDID_DIGITAL_DEPTH_16:
1704 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1710 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1711 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444)
1712 info->color_formats = DRM_COLOR_FORMAT_YCRCB444;
1713 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422)
1714 info->color_formats = DRM_COLOR_FORMAT_YCRCB422;
1716 /* Get data from CEA blocks if present */
1717 edid_ext = drm_find_cea_extension(edid);
1721 info->cea_rev = edid_ext[1];
1725 * drm_add_edid_modes - add modes from EDID data, if available
1726 * @connector: connector we're probing
1729 * Add the specified modes to the connector's mode list.
1731 * Return number of modes added or 0 if we couldn't find any.
1733 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1741 if (!drm_edid_is_valid(edid)) {
1742 device_printf(connector->dev->dev, "%s: EDID invalid.\n",
1743 drm_get_connector_name(connector));
1747 quirks = edid_get_quirks(edid);
1750 * EDID spec says modes should be preferred in this order:
1751 * - preferred detailed mode
1752 * - other detailed modes from base block
1753 * - detailed modes from extension blocks
1754 * - CVT 3-byte code modes
1755 * - standard timing codes
1756 * - established timing codes
1757 * - modes inferred from GTF or CVT range information
1759 * We get this pretty much right.
1761 * XXX order for additional mode types in extension blocks?
1763 num_modes += add_detailed_modes(connector, edid, quirks);
1764 num_modes += add_cvt_modes(connector, edid);
1765 num_modes += add_standard_modes(connector, edid);
1766 num_modes += add_established_modes(connector, edid);
1767 num_modes += add_inferred_modes(connector, edid);
1769 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1770 edid_fixup_preferred(connector, quirks);
1772 drm_add_display_info(edid, &connector->display_info);
1778 * drm_add_modes_noedid - add modes for the connectors without EDID
1779 * @connector: connector we're probing
1780 * @hdisplay: the horizontal display limit
1781 * @vdisplay: the vertical display limit
1783 * Add the specified modes to the connector's mode list. Only when the
1784 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1786 * Return number of modes added or 0 if we couldn't find any.
1788 int drm_add_modes_noedid(struct drm_connector *connector,
1789 int hdisplay, int vdisplay)
1791 int i, count, num_modes = 0;
1792 struct drm_display_mode *mode;
1793 struct drm_device *dev = connector->dev;
1795 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1801 for (i = 0; i < count; i++) {
1802 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1803 if (hdisplay && vdisplay) {
1805 * Only when two are valid, they will be used to check
1806 * whether the mode should be added to the mode list of
1809 if (ptr->hdisplay > hdisplay ||
1810 ptr->vdisplay > vdisplay)
1813 if (drm_mode_vrefresh(ptr) > 61)
1815 mode = drm_mode_duplicate(dev, ptr);
1817 drm_mode_probed_add(connector, mode);