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/export.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);
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)
161 struct edid *edid = (struct edid *)raw_edid;
164 int score = drm_edid_header_is_valid(raw_edid);
166 else if (score >= 6) {
167 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
168 memcpy(raw_edid, edid_header, sizeof(edid_header));
174 for (i = 0; i < EDID_LENGTH; i++)
177 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
179 /* allow CEA to slide through, switches mangle this */
180 if (raw_edid[0] != 0x02)
184 /* per-block-type checks */
185 switch (raw_edid[0]) {
187 if (edid->version != 1) {
188 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
192 if (edid->revision > 4)
193 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
204 printk(KERN_ERR "Raw EDID:\n");
205 print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
206 raw_edid, EDID_LENGTH, false);
210 EXPORT_SYMBOL(drm_edid_block_valid);
213 * drm_edid_is_valid - sanity check EDID data
216 * Sanity-check an entire EDID record (including extensions)
218 bool drm_edid_is_valid(struct edid *edid)
221 u8 *raw = (u8 *)edid;
226 for (i = 0; i <= edid->extensions; i++)
227 if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i))
232 EXPORT_SYMBOL(drm_edid_is_valid);
234 #define DDC_SEGMENT_ADDR 0x30
236 * Get EDID information via I2C.
238 * \param adapter : i2c device adaptor
239 * \param buf : EDID data buffer to be filled
240 * \param len : EDID data buffer length
241 * \return 0 on success or -1 on failure.
243 * Try to fetch EDID information by calling i2c driver function.
246 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
249 unsigned char start = block * EDID_LENGTH;
250 int ret, retries = 5;
252 /* The core i2c driver will automatically retry the transfer if the
253 * adapter reports EAGAIN. However, we find that bit-banging transfers
254 * are susceptible to errors under a heavily loaded machine and
255 * generate spurious NAKs and timeouts. Retrying the transfer
256 * of the individual block a few times seems to overcome this.
259 struct i2c_msg msgs[] = {
272 ret = i2c_transfer(adapter, msgs, 2);
274 DRM_DEBUG_KMS("drm: skipping non-existent adapter %s\n",
278 } while (ret != 2 && --retries);
280 return ret == 2 ? 0 : -1;
283 static bool drm_edid_is_zero(u8 *in_edid, int length)
286 u32 *raw_edid = (u32 *)in_edid;
288 for (i = 0; i < length / 4; i++)
289 if (*(raw_edid + i) != 0)
295 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
297 int i, j = 0, valid_extensions = 0;
300 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
303 /* base block fetch */
304 for (i = 0; i < 4; i++) {
305 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
307 if (drm_edid_block_valid(block, 0))
309 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
310 connector->null_edid_counter++;
317 /* if there's no extensions, we're done */
318 if (block[0x7e] == 0)
321 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
326 for (j = 1; j <= block[0x7e]; j++) {
327 for (i = 0; i < 4; i++) {
328 if (drm_do_probe_ddc_edid(adapter,
329 block + (valid_extensions + 1) * EDID_LENGTH,
332 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH, j)) {
338 dev_warn(connector->dev->dev,
339 "%s: Ignoring invalid EDID block %d.\n",
340 drm_get_connector_name(connector), j);
343 if (valid_extensions != block[0x7e]) {
344 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
345 block[0x7e] = valid_extensions;
346 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
355 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
356 drm_get_connector_name(connector), j);
364 * Probe DDC presence.
366 * \param adapter : i2c device adaptor
367 * \return 1 on success
370 drm_probe_ddc(struct i2c_adapter *adapter)
374 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
378 * drm_get_edid - get EDID data, if available
379 * @connector: connector we're probing
380 * @adapter: i2c adapter to use for DDC
382 * Poke the given i2c channel to grab EDID data if possible. If found,
383 * attach it to the connector.
385 * Return edid data or NULL if we couldn't find any.
387 struct edid *drm_get_edid(struct drm_connector *connector,
388 struct i2c_adapter *adapter)
390 struct edid *edid = NULL;
392 if (drm_probe_ddc(adapter))
393 edid = (struct edid *)drm_do_get_edid(connector, adapter);
395 connector->display_info.raw_edid = (char *)edid;
400 EXPORT_SYMBOL(drm_get_edid);
402 /*** EDID parsing ***/
405 * edid_vendor - match a string against EDID's obfuscated vendor field
406 * @edid: EDID to match
407 * @vendor: vendor string
409 * Returns true if @vendor is in @edid, false otherwise
411 static bool edid_vendor(struct edid *edid, char *vendor)
415 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
416 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
417 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
418 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
420 return !strncmp(edid_vendor, vendor, 3);
424 * edid_get_quirks - return quirk flags for a given EDID
425 * @edid: EDID to process
427 * This tells subsequent routines what fixes they need to apply.
429 static u32 edid_get_quirks(struct edid *edid)
431 struct edid_quirk *quirk;
434 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
435 quirk = &edid_quirk_list[i];
437 if (edid_vendor(edid, quirk->vendor) &&
438 (EDID_PRODUCT_ID(edid) == quirk->product_id))
439 return quirk->quirks;
445 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
446 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
449 * edid_fixup_preferred - set preferred modes based on quirk list
450 * @connector: has mode list to fix up
451 * @quirks: quirks list
453 * Walk the mode list for @connector, clearing the preferred status
454 * on existing modes and setting it anew for the right mode ala @quirks.
456 static void edid_fixup_preferred(struct drm_connector *connector,
459 struct drm_display_mode *t, *cur_mode, *preferred_mode;
460 int target_refresh = 0;
462 if (list_empty(&connector->probed_modes))
465 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
467 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
470 preferred_mode = list_first_entry(&connector->probed_modes,
471 struct drm_display_mode, head);
473 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
474 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
476 if (cur_mode == preferred_mode)
479 /* Largest mode is preferred */
480 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
481 preferred_mode = cur_mode;
483 /* At a given size, try to get closest to target refresh */
484 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
485 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
486 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
487 preferred_mode = cur_mode;
491 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
495 mode_is_rb(const struct drm_display_mode *mode)
497 return (mode->htotal - mode->hdisplay == 160) &&
498 (mode->hsync_end - mode->hdisplay == 80) &&
499 (mode->hsync_end - mode->hsync_start == 32) &&
500 (mode->vsync_start - mode->vdisplay == 3);
504 * drm_mode_find_dmt - Create a copy of a mode if present in DMT
505 * @dev: Device to duplicate against
507 * @vsize: Mode height
508 * @fresh: Mode refresh rate
509 * @rb: Mode reduced-blanking-ness
511 * Walk the DMT mode list looking for a match for the given parameters.
512 * Return a newly allocated copy of the mode, or NULL if not found.
514 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
515 int hsize, int vsize, int fresh,
520 for (i = 0; i < drm_num_dmt_modes; i++) {
521 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
522 if (hsize != ptr->hdisplay)
524 if (vsize != ptr->vdisplay)
526 if (fresh != drm_mode_vrefresh(ptr))
528 if (rb != mode_is_rb(ptr))
531 return drm_mode_duplicate(dev, ptr);
536 EXPORT_SYMBOL(drm_mode_find_dmt);
538 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
541 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
545 u8 *det_base = ext + d;
548 for (i = 0; i < n; i++)
549 cb((struct detailed_timing *)(det_base + 18 * i), closure);
553 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
555 unsigned int i, n = min((int)ext[0x02], 6);
556 u8 *det_base = ext + 5;
559 return; /* unknown version */
561 for (i = 0; i < n; i++)
562 cb((struct detailed_timing *)(det_base + 18 * i), closure);
566 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
569 struct edid *edid = (struct edid *)raw_edid;
574 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
575 cb(&(edid->detailed_timings[i]), closure);
577 for (i = 1; i <= raw_edid[0x7e]; i++) {
578 u8 *ext = raw_edid + (i * EDID_LENGTH);
581 cea_for_each_detailed_block(ext, cb, closure);
584 vtb_for_each_detailed_block(ext, cb, closure);
593 is_rb(struct detailed_timing *t, void *data)
596 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
598 *(bool *)data = true;
601 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
603 drm_monitor_supports_rb(struct edid *edid)
605 if (edid->revision >= 4) {
607 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
611 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
615 find_gtf2(struct detailed_timing *t, void *data)
618 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
622 /* Secondary GTF curve kicks in above some break frequency */
624 drm_gtf2_hbreak(struct edid *edid)
627 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
628 return r ? (r[12] * 2) : 0;
632 drm_gtf2_2c(struct edid *edid)
635 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
636 return r ? r[13] : 0;
640 drm_gtf2_m(struct edid *edid)
643 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
644 return r ? (r[15] << 8) + r[14] : 0;
648 drm_gtf2_k(struct edid *edid)
651 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
652 return r ? r[16] : 0;
656 drm_gtf2_2j(struct edid *edid)
659 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
660 return r ? r[17] : 0;
664 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
665 * @edid: EDID block to scan
667 static int standard_timing_level(struct edid *edid)
669 if (edid->revision >= 2) {
670 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
672 if (drm_gtf2_hbreak(edid))
680 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
681 * monitors fill with ascii space (0x20) instead.
684 bad_std_timing(u8 a, u8 b)
686 return (a == 0x00 && b == 0x00) ||
687 (a == 0x01 && b == 0x01) ||
688 (a == 0x20 && b == 0x20);
692 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
693 * @t: standard timing params
694 * @timing_level: standard timing level
696 * Take the standard timing params (in this case width, aspect, and refresh)
697 * and convert them into a real mode using CVT/GTF/DMT.
699 static struct drm_display_mode *
700 drm_mode_std(struct drm_connector *connector, struct edid *edid,
701 struct std_timing *t, int revision)
703 struct drm_device *dev = connector->dev;
704 struct drm_display_mode *m, *mode = NULL;
707 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
708 >> EDID_TIMING_ASPECT_SHIFT;
709 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
710 >> EDID_TIMING_VFREQ_SHIFT;
711 int timing_level = standard_timing_level(edid);
713 if (bad_std_timing(t->hsize, t->vfreq_aspect))
716 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
717 hsize = t->hsize * 8 + 248;
718 /* vrefresh_rate = vfreq + 60 */
719 vrefresh_rate = vfreq + 60;
720 /* the vdisplay is calculated based on the aspect ratio */
721 if (aspect_ratio == 0) {
725 vsize = (hsize * 10) / 16;
726 } else if (aspect_ratio == 1)
727 vsize = (hsize * 3) / 4;
728 else if (aspect_ratio == 2)
729 vsize = (hsize * 4) / 5;
731 vsize = (hsize * 9) / 16;
733 /* HDTV hack, part 1 */
734 if (vrefresh_rate == 60 &&
735 ((hsize == 1360 && vsize == 765) ||
736 (hsize == 1368 && vsize == 769))) {
742 * If this connector already has a mode for this size and refresh
743 * rate (because it came from detailed or CVT info), use that
744 * instead. This way we don't have to guess at interlace or
747 list_for_each_entry(m, &connector->probed_modes, head)
748 if (m->hdisplay == hsize && m->vdisplay == vsize &&
749 drm_mode_vrefresh(m) == vrefresh_rate)
752 /* HDTV hack, part 2 */
753 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
754 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
756 mode->hdisplay = 1366;
757 mode->hsync_start = mode->hsync_start - 1;
758 mode->hsync_end = mode->hsync_end - 1;
762 /* check whether it can be found in default mode table */
763 if (drm_monitor_supports_rb(edid)) {
764 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate,
769 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate, false);
773 /* okay, generate it */
774 switch (timing_level) {
778 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
782 * This is potentially wrong if there's ever a monitor with
783 * more than one ranges section, each claiming a different
784 * secondary GTF curve. Please don't do that.
786 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
789 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
790 drm_mode_destroy(dev, mode);
791 mode = drm_gtf_mode_complex(dev, hsize, vsize,
800 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
808 * EDID is delightfully ambiguous about how interlaced modes are to be
809 * encoded. Our internal representation is of frame height, but some
810 * HDTV detailed timings are encoded as field height.
812 * The format list here is from CEA, in frame size. Technically we
813 * should be checking refresh rate too. Whatever.
816 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
817 struct detailed_pixel_timing *pt)
820 static const struct {
822 } cea_interlaced[] = {
832 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
835 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
836 if ((mode->hdisplay == cea_interlaced[i].w) &&
837 (mode->vdisplay == cea_interlaced[i].h / 2)) {
839 mode->vsync_start *= 2;
840 mode->vsync_end *= 2;
846 mode->flags |= DRM_MODE_FLAG_INTERLACE;
850 * drm_mode_detailed - create a new mode from an EDID detailed timing section
851 * @dev: DRM device (needed to create new mode)
853 * @timing: EDID detailed timing info
854 * @quirks: quirks to apply
856 * An EDID detailed timing block contains enough info for us to create and
857 * return a new struct drm_display_mode.
859 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
861 struct detailed_timing *timing,
864 struct drm_display_mode *mode;
865 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
866 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
867 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
868 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
869 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
870 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
871 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
872 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
873 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
875 /* ignore tiny modes */
876 if (hactive < 64 || vactive < 64)
879 if (pt->misc & DRM_EDID_PT_STEREO) {
880 printk(KERN_WARNING "stereo mode not supported\n");
883 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
884 printk(KERN_WARNING "composite sync not supported\n");
887 /* it is incorrect if hsync/vsync width is zero */
888 if (!hsync_pulse_width || !vsync_pulse_width) {
889 DRM_DEBUG_KMS("Incorrect Detailed timing. "
890 "Wrong Hsync/Vsync pulse width\n");
894 if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
895 mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
902 mode = drm_mode_create(dev);
906 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
907 timing->pixel_clock = cpu_to_le16(1088);
909 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
911 mode->hdisplay = hactive;
912 mode->hsync_start = mode->hdisplay + hsync_offset;
913 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
914 mode->htotal = mode->hdisplay + hblank;
916 mode->vdisplay = vactive;
917 mode->vsync_start = mode->vdisplay + vsync_offset;
918 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
919 mode->vtotal = mode->vdisplay + vblank;
921 /* Some EDIDs have bogus h/vtotal values */
922 if (mode->hsync_end > mode->htotal)
923 mode->htotal = mode->hsync_end + 1;
924 if (mode->vsync_end > mode->vtotal)
925 mode->vtotal = mode->vsync_end + 1;
927 drm_mode_do_interlace_quirk(mode, pt);
929 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
930 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
933 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
934 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
935 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
936 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
939 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
940 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
942 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
943 mode->width_mm *= 10;
944 mode->height_mm *= 10;
947 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
948 mode->width_mm = edid->width_cm * 10;
949 mode->height_mm = edid->height_cm * 10;
952 mode->type = DRM_MODE_TYPE_DRIVER;
953 drm_mode_set_name(mode);
959 mode_in_hsync_range(const struct drm_display_mode *mode,
960 struct edid *edid, u8 *t)
962 int hsync, hmin, hmax;
965 if (edid->revision >= 4)
966 hmin += ((t[4] & 0x04) ? 255 : 0);
968 if (edid->revision >= 4)
969 hmax += ((t[4] & 0x08) ? 255 : 0);
970 hsync = drm_mode_hsync(mode);
972 return (hsync <= hmax && hsync >= hmin);
976 mode_in_vsync_range(const struct drm_display_mode *mode,
977 struct edid *edid, u8 *t)
979 int vsync, vmin, vmax;
982 if (edid->revision >= 4)
983 vmin += ((t[4] & 0x01) ? 255 : 0);
985 if (edid->revision >= 4)
986 vmax += ((t[4] & 0x02) ? 255 : 0);
987 vsync = drm_mode_vrefresh(mode);
989 return (vsync <= vmax && vsync >= vmin);
993 range_pixel_clock(struct edid *edid, u8 *t)
996 if (t[9] == 0 || t[9] == 255)
999 /* 1.4 with CVT support gives us real precision, yay */
1000 if (edid->revision >= 4 && t[10] == 0x04)
1001 return (t[9] * 10000) - ((t[12] >> 2) * 250);
1003 /* 1.3 is pathetic, so fuzz up a bit */
1004 return t[9] * 10000 + 5001;
1008 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
1009 struct detailed_timing *timing)
1012 u8 *t = (u8 *)timing;
1014 if (!mode_in_hsync_range(mode, edid, t))
1017 if (!mode_in_vsync_range(mode, edid, t))
1020 if ((max_clock = range_pixel_clock(edid, t)))
1021 if (mode->clock > max_clock)
1024 /* 1.4 max horizontal check */
1025 if (edid->revision >= 4 && t[10] == 0x04)
1026 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
1029 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1036 drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1037 struct detailed_timing *timing)
1040 struct drm_display_mode *newmode;
1041 struct drm_device *dev = connector->dev;
1043 for (i = 0; i < drm_num_dmt_modes; i++) {
1044 if (mode_in_range(drm_dmt_modes + i, edid, timing)) {
1045 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1047 drm_mode_probed_add(connector, newmode);
1056 /* fix up 1366x768 mode from 1368x768;
1057 * GFT/CVT can't express 1366 width which isn't dividable by 8
1059 static void fixup_mode_1366x768(struct drm_display_mode *mode)
1061 if (mode->hdisplay == 1368 && mode->vdisplay == 768) {
1062 mode->hdisplay = 1366;
1063 mode->hsync_start--;
1065 drm_mode_set_name(mode);
1070 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1071 struct detailed_timing *timing)
1074 struct drm_display_mode *newmode;
1075 struct drm_device *dev = connector->dev;
1077 for (i = 0; i < num_extra_modes; i++) {
1078 const struct minimode *m = &extra_modes[i];
1079 newmode = drm_gtf_mode(dev, m->w, m->h, m->r, 0, 0);
1083 fixup_mode_1366x768(newmode);
1084 if (!mode_in_range(newmode, edid, timing)) {
1085 drm_mode_destroy(dev, newmode);
1089 drm_mode_probed_add(connector, newmode);
1097 drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid,
1098 struct detailed_timing *timing)
1101 struct drm_display_mode *newmode;
1102 struct drm_device *dev = connector->dev;
1103 bool rb = drm_monitor_supports_rb(edid);
1105 for (i = 0; i < num_extra_modes; i++) {
1106 const struct minimode *m = &extra_modes[i];
1107 newmode = drm_cvt_mode(dev, m->w, m->h, m->r, rb, 0, 0);
1111 fixup_mode_1366x768(newmode);
1112 if (!mode_in_range(newmode, edid, timing)) {
1113 drm_mode_destroy(dev, newmode);
1117 drm_mode_probed_add(connector, newmode);
1125 do_inferred_modes(struct detailed_timing *timing, void *c)
1127 struct detailed_mode_closure *closure = c;
1128 struct detailed_non_pixel *data = &timing->data.other_data;
1129 struct detailed_data_monitor_range *range = &data->data.range;
1131 if (data->type != EDID_DETAIL_MONITOR_RANGE)
1134 closure->modes += drm_dmt_modes_for_range(closure->connector,
1138 if (!version_greater(closure->edid, 1, 1))
1139 return; /* GTF not defined yet */
1141 switch (range->flags) {
1142 case 0x02: /* secondary gtf, XXX could do more */
1143 case 0x00: /* default gtf */
1144 closure->modes += drm_gtf_modes_for_range(closure->connector,
1148 case 0x04: /* cvt, only in 1.4+ */
1149 if (!version_greater(closure->edid, 1, 3))
1152 closure->modes += drm_cvt_modes_for_range(closure->connector,
1156 case 0x01: /* just the ranges, no formula */
1163 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1165 struct detailed_mode_closure closure = {
1166 connector, edid, 0, 0, 0
1169 if (version_greater(edid, 1, 0))
1170 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1173 return closure.modes;
1177 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1179 int i, j, m, modes = 0;
1180 struct drm_display_mode *mode;
1181 u8 *est = ((u8 *)timing) + 5;
1183 for (i = 0; i < 6; i++) {
1184 for (j = 7; j > 0; j--) {
1185 m = (i * 8) + (7 - j);
1186 if (m >= ARRAY_SIZE(est3_modes))
1188 if (est[i] & (1 << j)) {
1189 mode = drm_mode_find_dmt(connector->dev,
1195 drm_mode_probed_add(connector, mode);
1206 do_established_modes(struct detailed_timing *timing, void *c)
1208 struct detailed_mode_closure *closure = c;
1209 struct detailed_non_pixel *data = &timing->data.other_data;
1211 if (data->type == EDID_DETAIL_EST_TIMINGS)
1212 closure->modes += drm_est3_modes(closure->connector, timing);
1216 * add_established_modes - get est. modes from EDID and add them
1217 * @edid: EDID block to scan
1219 * Each EDID block contains a bitmap of the supported "established modes" list
1220 * (defined above). Tease them out and add them to the global modes list.
1223 add_established_modes(struct drm_connector *connector, struct edid *edid)
1225 struct drm_device *dev = connector->dev;
1226 unsigned long est_bits = edid->established_timings.t1 |
1227 (edid->established_timings.t2 << 8) |
1228 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1230 struct detailed_mode_closure closure = {
1231 connector, edid, 0, 0, 0
1234 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1235 if (est_bits & (1<<i)) {
1236 struct drm_display_mode *newmode;
1237 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1239 drm_mode_probed_add(connector, newmode);
1245 if (version_greater(edid, 1, 0))
1246 drm_for_each_detailed_block((u8 *)edid,
1247 do_established_modes, &closure);
1249 return modes + closure.modes;
1253 do_standard_modes(struct detailed_timing *timing, void *c)
1255 struct detailed_mode_closure *closure = c;
1256 struct detailed_non_pixel *data = &timing->data.other_data;
1257 struct drm_connector *connector = closure->connector;
1258 struct edid *edid = closure->edid;
1260 if (data->type == EDID_DETAIL_STD_MODES) {
1262 for (i = 0; i < 6; i++) {
1263 struct std_timing *std;
1264 struct drm_display_mode *newmode;
1266 std = &data->data.timings[i];
1267 newmode = drm_mode_std(connector, edid, std,
1270 drm_mode_probed_add(connector, newmode);
1278 * add_standard_modes - get std. modes from EDID and add them
1279 * @edid: EDID block to scan
1281 * Standard modes can be calculated using the appropriate standard (DMT,
1282 * GTF or CVT. Grab them from @edid and add them to the list.
1285 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1288 struct detailed_mode_closure closure = {
1289 connector, edid, 0, 0, 0
1292 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1293 struct drm_display_mode *newmode;
1295 newmode = drm_mode_std(connector, edid,
1296 &edid->standard_timings[i],
1299 drm_mode_probed_add(connector, newmode);
1304 if (version_greater(edid, 1, 0))
1305 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1308 /* XXX should also look for standard codes in VTB blocks */
1310 return modes + closure.modes;
1313 static int drm_cvt_modes(struct drm_connector *connector,
1314 struct detailed_timing *timing)
1316 int i, j, modes = 0;
1317 struct drm_display_mode *newmode;
1318 struct drm_device *dev = connector->dev;
1319 struct cvt_timing *cvt;
1320 const int rates[] = { 60, 85, 75, 60, 50 };
1321 const u8 empty[3] = { 0, 0, 0 };
1323 for (i = 0; i < 4; i++) {
1324 int uninitialized_var(width), height;
1325 cvt = &(timing->data.other_data.data.cvt[i]);
1327 if (!memcmp(cvt->code, empty, 3))
1330 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1331 switch (cvt->code[1] & 0x0c) {
1333 width = height * 4 / 3;
1336 width = height * 16 / 9;
1339 width = height * 16 / 10;
1342 width = height * 15 / 9;
1346 for (j = 1; j < 5; j++) {
1347 if (cvt->code[2] & (1 << j)) {
1348 newmode = drm_cvt_mode(dev, width, height,
1352 drm_mode_probed_add(connector, newmode);
1363 do_cvt_mode(struct detailed_timing *timing, void *c)
1365 struct detailed_mode_closure *closure = c;
1366 struct detailed_non_pixel *data = &timing->data.other_data;
1368 if (data->type == EDID_DETAIL_CVT_3BYTE)
1369 closure->modes += drm_cvt_modes(closure->connector, timing);
1373 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1375 struct detailed_mode_closure closure = {
1376 connector, edid, 0, 0, 0
1379 if (version_greater(edid, 1, 2))
1380 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1382 /* XXX should also look for CVT codes in VTB blocks */
1384 return closure.modes;
1388 do_detailed_mode(struct detailed_timing *timing, void *c)
1390 struct detailed_mode_closure *closure = c;
1391 struct drm_display_mode *newmode;
1393 if (timing->pixel_clock) {
1394 newmode = drm_mode_detailed(closure->connector->dev,
1395 closure->edid, timing,
1400 if (closure->preferred)
1401 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1403 drm_mode_probed_add(closure->connector, newmode);
1405 closure->preferred = 0;
1410 * add_detailed_modes - Add modes from detailed timings
1411 * @connector: attached connector
1412 * @edid: EDID block to scan
1413 * @quirks: quirks to apply
1416 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1419 struct detailed_mode_closure closure = {
1427 if (closure.preferred && !version_greater(edid, 1, 3))
1429 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1431 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1433 return closure.modes;
1436 #define HDMI_IDENTIFIER 0x000C03
1437 #define AUDIO_BLOCK 0x01
1438 #define VIDEO_BLOCK 0x02
1439 #define VENDOR_BLOCK 0x03
1440 #define SPEAKER_BLOCK 0x04
1441 #define EDID_BASIC_AUDIO (1 << 6)
1442 #define EDID_CEA_YCRCB444 (1 << 5)
1443 #define EDID_CEA_YCRCB422 (1 << 4)
1446 * Search EDID for CEA extension block.
1448 u8 *drm_find_cea_extension(struct edid *edid)
1450 u8 *edid_ext = NULL;
1453 /* No EDID or EDID extensions */
1454 if (edid == NULL || edid->extensions == 0)
1457 /* Find CEA extension */
1458 for (i = 0; i < edid->extensions; i++) {
1459 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1460 if (edid_ext[0] == CEA_EXT)
1464 if (i == edid->extensions)
1469 EXPORT_SYMBOL(drm_find_cea_extension);
1472 do_cea_modes (struct drm_connector *connector, u8 *db, u8 len)
1474 struct drm_device *dev = connector->dev;
1475 u8 * mode, cea_mode;
1478 for (mode = db; mode < db + len; mode++) {
1479 cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
1480 if (cea_mode < drm_num_cea_modes) {
1481 struct drm_display_mode *newmode;
1482 newmode = drm_mode_duplicate(dev,
1483 &edid_cea_modes[cea_mode]);
1485 drm_mode_probed_add(connector, newmode);
1495 add_cea_modes(struct drm_connector *connector, struct edid *edid)
1497 u8 * cea = drm_find_cea_extension(edid);
1501 if (cea && cea[1] >= 3) {
1502 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1504 if (((db[0] & 0xe0) >> 5) == VIDEO_BLOCK)
1505 modes += do_cea_modes (connector, db+1, dbl);
1513 parse_hdmi_vsdb(struct drm_connector *connector, uint8_t *db)
1515 connector->eld[5] |= (db[6] >> 7) << 1; /* Supports_AI */
1517 connector->dvi_dual = db[6] & 1;
1518 connector->max_tmds_clock = db[7] * 5;
1520 connector->latency_present[0] = db[8] >> 7;
1521 connector->latency_present[1] = (db[8] >> 6) & 1;
1522 connector->video_latency[0] = db[9];
1523 connector->audio_latency[0] = db[10];
1524 connector->video_latency[1] = db[11];
1525 connector->audio_latency[1] = db[12];
1527 DRM_LOG_KMS("HDMI: DVI dual %d, "
1528 "max TMDS clock %d, "
1529 "latency present %d %d, "
1530 "video latency %d %d, "
1531 "audio latency %d %d\n",
1532 connector->dvi_dual,
1533 connector->max_tmds_clock,
1534 (int) connector->latency_present[0],
1535 (int) connector->latency_present[1],
1536 connector->video_latency[0],
1537 connector->video_latency[1],
1538 connector->audio_latency[0],
1539 connector->audio_latency[1]);
1543 monitor_name(struct detailed_timing *t, void *data)
1545 if (t->data.other_data.type == EDID_DETAIL_MONITOR_NAME)
1546 *(u8 **)data = t->data.other_data.data.str.str;
1550 * drm_edid_to_eld - build ELD from EDID
1551 * @connector: connector corresponding to the HDMI/DP sink
1552 * @edid: EDID to parse
1554 * Fill the ELD (EDID-Like Data) buffer for passing to the audio driver.
1555 * Some ELD fields are left to the graphics driver caller:
1560 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
1562 uint8_t *eld = connector->eld;
1570 memset(eld, 0, sizeof(connector->eld));
1572 cea = drm_find_cea_extension(edid);
1574 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
1579 drm_for_each_detailed_block((u8 *)edid, monitor_name, &name);
1580 for (mnl = 0; name && mnl < 13; mnl++) {
1581 if (name[mnl] == 0x0a)
1583 eld[20 + mnl] = name[mnl];
1585 eld[4] = (cea[1] << 5) | mnl;
1586 DRM_DEBUG_KMS("ELD monitor %s\n", eld + 20);
1588 eld[0] = 2 << 3; /* ELD version: 2 */
1590 eld[16] = edid->mfg_id[0];
1591 eld[17] = edid->mfg_id[1];
1592 eld[18] = edid->prod_code[0];
1593 eld[19] = edid->prod_code[1];
1596 for (db = cea + 4; db < cea + cea[2]; db += dbl + 1) {
1599 switch ((db[0] & 0xe0) >> 5) {
1601 /* Audio Data Block, contains SADs */
1602 sad_count = dbl / 3;
1603 memcpy(eld + 20 + mnl, &db[1], dbl);
1606 /* Speaker Allocation Data Block */
1610 /* HDMI Vendor-Specific Data Block */
1611 if (db[1] == 0x03 && db[2] == 0x0c && db[3] == 0)
1612 parse_hdmi_vsdb(connector, db);
1618 eld[5] |= sad_count << 4;
1619 eld[2] = (20 + mnl + sad_count * 3 + 3) / 4;
1621 DRM_DEBUG_KMS("ELD size %d, SAD count %d\n", (int)eld[2], sad_count);
1623 EXPORT_SYMBOL(drm_edid_to_eld);
1626 * drm_av_sync_delay - HDMI/DP sink audio-video sync delay in millisecond
1627 * @connector: connector associated with the HDMI/DP sink
1628 * @mode: the display mode
1630 int drm_av_sync_delay(struct drm_connector *connector,
1631 struct drm_display_mode *mode)
1633 int i = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1636 if (!connector->latency_present[0])
1638 if (!connector->latency_present[1])
1641 a = connector->audio_latency[i];
1642 v = connector->video_latency[i];
1645 * HDMI/DP sink doesn't support audio or video?
1647 if (a == 255 || v == 255)
1651 * Convert raw EDID values to millisecond.
1652 * Treat unknown latency as 0ms.
1655 a = min(2 * (a - 1), 500);
1657 v = min(2 * (v - 1), 500);
1659 return max(v - a, 0);
1661 EXPORT_SYMBOL(drm_av_sync_delay);
1664 * drm_select_eld - select one ELD from multiple HDMI/DP sinks
1665 * @encoder: the encoder just changed display mode
1666 * @mode: the adjusted display mode
1668 * It's possible for one encoder to be associated with multiple HDMI/DP sinks.
1669 * The policy is now hard coded to simply use the first HDMI/DP sink's ELD.
1671 struct drm_connector *drm_select_eld(struct drm_encoder *encoder,
1672 struct drm_display_mode *mode)
1674 struct drm_connector *connector;
1675 struct drm_device *dev = encoder->dev;
1677 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1678 if (connector->encoder == encoder && connector->eld[0])
1683 EXPORT_SYMBOL(drm_select_eld);
1686 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1687 * @edid: monitor EDID information
1689 * Parse the CEA extension according to CEA-861-B.
1690 * Return true if HDMI, false if not or unknown.
1692 bool drm_detect_hdmi_monitor(struct edid *edid)
1696 int start_offset, end_offset;
1697 bool is_hdmi = false;
1699 edid_ext = drm_find_cea_extension(edid);
1703 /* Data block offset in CEA extension block */
1705 end_offset = edid_ext[2];
1708 * Because HDMI identifier is in Vendor Specific Block,
1709 * search it from all data blocks of CEA extension.
1711 for (i = start_offset; i < end_offset;
1712 /* Increased by data block len */
1713 i += ((edid_ext[i] & 0x1f) + 1)) {
1714 /* Find vendor specific block */
1715 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1716 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1717 edid_ext[i + 3] << 16;
1718 /* Find HDMI identifier */
1719 if (hdmi_id == HDMI_IDENTIFIER)
1728 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1731 * drm_detect_monitor_audio - check monitor audio capability
1733 * Monitor should have CEA extension block.
1734 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1735 * audio' only. If there is any audio extension block and supported
1736 * audio format, assume at least 'basic audio' support, even if 'basic
1737 * audio' is not defined in EDID.
1740 bool drm_detect_monitor_audio(struct edid *edid)
1744 bool has_audio = false;
1745 int start_offset, end_offset;
1747 edid_ext = drm_find_cea_extension(edid);
1751 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1754 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1758 /* Data block offset in CEA extension block */
1760 end_offset = edid_ext[2];
1762 for (i = start_offset; i < end_offset;
1763 i += ((edid_ext[i] & 0x1f) + 1)) {
1764 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1766 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1767 DRM_DEBUG_KMS("CEA audio format %d\n",
1768 (edid_ext[i + j] >> 3) & 0xf);
1775 EXPORT_SYMBOL(drm_detect_monitor_audio);
1778 * drm_add_display_info - pull display info out if present
1780 * @info: display info (attached to connector)
1782 * Grab any available display info and stuff it into the drm_display_info
1783 * structure that's part of the connector. Useful for tracking bpp and
1786 static void drm_add_display_info(struct edid *edid,
1787 struct drm_display_info *info)
1791 info->width_mm = edid->width_cm * 10;
1792 info->height_mm = edid->height_cm * 10;
1794 /* driver figures it out in this case */
1796 info->color_formats = 0;
1798 if (edid->revision < 3)
1801 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1804 /* Get data from CEA blocks if present */
1805 edid_ext = drm_find_cea_extension(edid);
1807 info->cea_rev = edid_ext[1];
1809 /* The existence of a CEA block should imply RGB support */
1810 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1811 if (edid_ext[3] & EDID_CEA_YCRCB444)
1812 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1813 if (edid_ext[3] & EDID_CEA_YCRCB422)
1814 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1817 /* Only defined for 1.4 with digital displays */
1818 if (edid->revision < 4)
1821 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1822 case DRM_EDID_DIGITAL_DEPTH_6:
1825 case DRM_EDID_DIGITAL_DEPTH_8:
1828 case DRM_EDID_DIGITAL_DEPTH_10:
1831 case DRM_EDID_DIGITAL_DEPTH_12:
1834 case DRM_EDID_DIGITAL_DEPTH_14:
1837 case DRM_EDID_DIGITAL_DEPTH_16:
1840 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1846 info->color_formats |= DRM_COLOR_FORMAT_RGB444;
1847 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB444)
1848 info->color_formats |= DRM_COLOR_FORMAT_YCRCB444;
1849 if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422)
1850 info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
1854 * drm_add_edid_modes - add modes from EDID data, if available
1855 * @connector: connector we're probing
1858 * Add the specified modes to the connector's mode list.
1860 * Return number of modes added or 0 if we couldn't find any.
1862 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1870 if (!drm_edid_is_valid(edid)) {
1871 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1872 drm_get_connector_name(connector));
1876 quirks = edid_get_quirks(edid);
1879 * EDID spec says modes should be preferred in this order:
1880 * - preferred detailed mode
1881 * - other detailed modes from base block
1882 * - detailed modes from extension blocks
1883 * - CVT 3-byte code modes
1884 * - standard timing codes
1885 * - established timing codes
1886 * - modes inferred from GTF or CVT range information
1888 * We get this pretty much right.
1890 * XXX order for additional mode types in extension blocks?
1892 num_modes += add_detailed_modes(connector, edid, quirks);
1893 num_modes += add_cvt_modes(connector, edid);
1894 num_modes += add_standard_modes(connector, edid);
1895 num_modes += add_established_modes(connector, edid);
1896 num_modes += add_inferred_modes(connector, edid);
1897 num_modes += add_cea_modes(connector, edid);
1899 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1900 edid_fixup_preferred(connector, quirks);
1902 drm_add_display_info(edid, &connector->display_info);
1906 EXPORT_SYMBOL(drm_add_edid_modes);
1909 * drm_add_modes_noedid - add modes for the connectors without EDID
1910 * @connector: connector we're probing
1911 * @hdisplay: the horizontal display limit
1912 * @vdisplay: the vertical display limit
1914 * Add the specified modes to the connector's mode list. Only when the
1915 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1917 * Return number of modes added or 0 if we couldn't find any.
1919 int drm_add_modes_noedid(struct drm_connector *connector,
1920 int hdisplay, int vdisplay)
1922 int i, count, num_modes = 0;
1923 struct drm_display_mode *mode;
1924 struct drm_device *dev = connector->dev;
1926 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1932 for (i = 0; i < count; i++) {
1933 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1934 if (hdisplay && vdisplay) {
1936 * Only when two are valid, they will be used to check
1937 * whether the mode should be added to the mode list of
1940 if (ptr->hdisplay > hdisplay ||
1941 ptr->vdisplay > vdisplay)
1944 if (drm_mode_vrefresh(ptr) > 61)
1946 mode = drm_mode_duplicate(dev, ptr);
1948 drm_mode_probed_add(connector, mode);
1954 EXPORT_SYMBOL(drm_add_modes_noedid);