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/i2c-algo-bit.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)
70 struct detailed_mode_closure {
71 struct drm_connector *connector;
83 static struct edid_quirk {
87 } edid_quirk_list[] = {
89 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
91 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
93 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
95 /* Belinea 10 15 55 */
96 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
97 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
99 /* Envision Peripherals, Inc. EN-7100e */
100 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
101 /* Envision EN2028 */
102 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
104 /* Funai Electronics PM36B */
105 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
106 EDID_QUIRK_DETAILED_IN_CM },
108 /* LG Philips LCD LP154W01-A5 */
109 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
110 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
112 /* Philips 107p5 CRT */
113 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
116 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
118 /* Samsung SyncMaster 205BW. Note: irony */
119 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
120 /* Samsung SyncMaster 22[5-6]BW */
121 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
122 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
125 /*** DDC fetch and block validation ***/
127 static const u8 edid_header[] = {
128 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
132 * Sanity check the EDID block (base or extension). Return 0 if the block
133 * doesn't check out, or 1 if it's valid.
136 drm_edid_block_valid(u8 *raw_edid)
140 struct edid *edid = (struct edid *)raw_edid;
142 if (raw_edid[0] == 0x00) {
145 for (i = 0; i < sizeof(edid_header); i++)
146 if (raw_edid[i] == edid_header[i])
150 else if (score >= 6) {
151 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
152 memcpy(raw_edid, edid_header, sizeof(edid_header));
158 for (i = 0; i < EDID_LENGTH; i++)
161 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
163 /* allow CEA to slide through, switches mangle this */
164 if (raw_edid[0] != 0x02)
168 /* per-block-type checks */
169 switch (raw_edid[0]) {
171 if (edid->version != 1) {
172 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
176 if (edid->revision > 4)
177 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
188 DRM_ERROR("Raw EDID:\n");
189 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
196 * drm_edid_is_valid - sanity check EDID data
199 * Sanity-check an entire EDID record (including extensions)
201 bool drm_edid_is_valid(struct edid *edid)
204 u8 *raw = (u8 *)edid;
209 for (i = 0; i <= edid->extensions; i++)
210 if (!drm_edid_block_valid(raw + i * EDID_LENGTH))
215 EXPORT_SYMBOL(drm_edid_is_valid);
217 #define DDC_ADDR 0x50
218 #define DDC_SEGMENT_ADDR 0x30
220 * Get EDID information via I2C.
222 * \param adapter : i2c device adaptor
223 * \param buf : EDID data buffer to be filled
224 * \param len : EDID data buffer length
225 * \return 0 on success or -1 on failure.
227 * Try to fetch EDID information by calling i2c driver function.
230 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
233 unsigned char start = block * EDID_LENGTH;
234 struct i2c_msg msgs[] = {
248 if (i2c_transfer(adapter, msgs, 2) == 2)
255 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
260 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
263 /* base block fetch */
264 for (i = 0; i < 4; i++) {
265 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
267 if (drm_edid_block_valid(block))
273 /* if there's no extensions, we're done */
274 if (block[0x7e] == 0)
277 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
282 for (j = 1; j <= block[0x7e]; j++) {
283 for (i = 0; i < 4; i++) {
284 if (drm_do_probe_ddc_edid(adapter, block, j,
287 if (drm_edid_block_valid(block + j * EDID_LENGTH))
297 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
298 drm_get_connector_name(connector), j);
306 * Probe DDC presence.
308 * \param adapter : i2c device adaptor
309 * \return 1 on success
312 drm_probe_ddc(struct i2c_adapter *adapter)
316 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
320 * drm_get_edid - get EDID data, if available
321 * @connector: connector we're probing
322 * @adapter: i2c adapter to use for DDC
324 * Poke the given i2c channel to grab EDID data if possible. If found,
325 * attach it to the connector.
327 * Return edid data or NULL if we couldn't find any.
329 struct edid *drm_get_edid(struct drm_connector *connector,
330 struct i2c_adapter *adapter)
332 struct edid *edid = NULL;
334 if (drm_probe_ddc(adapter))
335 edid = (struct edid *)drm_do_get_edid(connector, adapter);
337 connector->display_info.raw_edid = (char *)edid;
342 EXPORT_SYMBOL(drm_get_edid);
344 /*** EDID parsing ***/
347 * edid_vendor - match a string against EDID's obfuscated vendor field
348 * @edid: EDID to match
349 * @vendor: vendor string
351 * Returns true if @vendor is in @edid, false otherwise
353 static bool edid_vendor(struct edid *edid, char *vendor)
357 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
358 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
359 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
360 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
362 return !strncmp(edid_vendor, vendor, 3);
366 * edid_get_quirks - return quirk flags for a given EDID
367 * @edid: EDID to process
369 * This tells subsequent routines what fixes they need to apply.
371 static u32 edid_get_quirks(struct edid *edid)
373 struct edid_quirk *quirk;
376 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
377 quirk = &edid_quirk_list[i];
379 if (edid_vendor(edid, quirk->vendor) &&
380 (EDID_PRODUCT_ID(edid) == quirk->product_id))
381 return quirk->quirks;
387 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
388 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
391 * edid_fixup_preferred - set preferred modes based on quirk list
392 * @connector: has mode list to fix up
393 * @quirks: quirks list
395 * Walk the mode list for @connector, clearing the preferred status
396 * on existing modes and setting it anew for the right mode ala @quirks.
398 static void edid_fixup_preferred(struct drm_connector *connector,
401 struct drm_display_mode *t, *cur_mode, *preferred_mode;
402 int target_refresh = 0;
404 if (list_empty(&connector->probed_modes))
407 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
409 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
412 preferred_mode = list_first_entry(&connector->probed_modes,
413 struct drm_display_mode, head);
415 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
416 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
418 if (cur_mode == preferred_mode)
421 /* Largest mode is preferred */
422 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
423 preferred_mode = cur_mode;
425 /* At a given size, try to get closest to target refresh */
426 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
427 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
428 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
429 preferred_mode = cur_mode;
433 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
436 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
437 int hsize, int vsize, int fresh)
440 struct drm_display_mode *ptr, *mode;
443 for (i = 0; i < drm_num_dmt_modes; i++) {
444 ptr = &drm_dmt_modes[i];
445 if (hsize == ptr->hdisplay &&
446 vsize == ptr->vdisplay &&
447 fresh == drm_mode_vrefresh(ptr)) {
448 /* get the expected default mode */
449 mode = drm_mode_duplicate(dev, ptr);
455 EXPORT_SYMBOL(drm_mode_find_dmt);
457 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
460 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
463 u8 rev = ext[0x01], d = ext[0x02];
464 u8 *det_base = ext + d;
471 /* have to infer how many blocks we have, check pixel clock */
472 for (i = 0; i < 6; i++)
473 if (det_base[18*i] || det_base[18*i+1])
478 n = min(ext[0x03] & 0x0f, 6);
482 for (i = 0; i < n; i++)
483 cb((struct detailed_timing *)(det_base + 18 * i), closure);
487 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
489 unsigned int i, n = min((int)ext[0x02], 6);
490 u8 *det_base = ext + 5;
493 return; /* unknown version */
495 for (i = 0; i < n; i++)
496 cb((struct detailed_timing *)(det_base + 18 * i), closure);
500 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
503 struct edid *edid = (struct edid *)raw_edid;
508 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
509 cb(&(edid->detailed_timings[i]), closure);
511 for (i = 1; i <= raw_edid[0x7e]; i++) {
512 u8 *ext = raw_edid + (i * EDID_LENGTH);
515 cea_for_each_detailed_block(ext, cb, closure);
518 vtb_for_each_detailed_block(ext, cb, closure);
527 is_rb(struct detailed_timing *t, void *data)
530 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
532 *(bool *)data = true;
535 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
537 drm_monitor_supports_rb(struct edid *edid)
539 if (edid->revision >= 4) {
541 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
545 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
549 find_gtf2(struct detailed_timing *t, void *data)
552 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
556 /* Secondary GTF curve kicks in above some break frequency */
558 drm_gtf2_hbreak(struct edid *edid)
561 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
562 return r ? (r[12] * 2) : 0;
566 drm_gtf2_2c(struct edid *edid)
569 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
570 return r ? r[13] : 0;
574 drm_gtf2_m(struct edid *edid)
577 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
578 return r ? (r[15] << 8) + r[14] : 0;
582 drm_gtf2_k(struct edid *edid)
585 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
586 return r ? r[16] : 0;
590 drm_gtf2_2j(struct edid *edid)
593 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
594 return r ? r[17] : 0;
598 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
599 * @edid: EDID block to scan
601 static int standard_timing_level(struct edid *edid)
603 if (edid->revision >= 2) {
604 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
606 if (drm_gtf2_hbreak(edid))
614 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
615 * monitors fill with ascii space (0x20) instead.
618 bad_std_timing(u8 a, u8 b)
620 return (a == 0x00 && b == 0x00) ||
621 (a == 0x01 && b == 0x01) ||
622 (a == 0x20 && b == 0x20);
626 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
627 * @t: standard timing params
628 * @timing_level: standard timing level
630 * Take the standard timing params (in this case width, aspect, and refresh)
631 * and convert them into a real mode using CVT/GTF/DMT.
633 static struct drm_display_mode *
634 drm_mode_std(struct drm_connector *connector, struct edid *edid,
635 struct std_timing *t, int revision)
637 struct drm_device *dev = connector->dev;
638 struct drm_display_mode *m, *mode = NULL;
641 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
642 >> EDID_TIMING_ASPECT_SHIFT;
643 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
644 >> EDID_TIMING_VFREQ_SHIFT;
645 int timing_level = standard_timing_level(edid);
647 if (bad_std_timing(t->hsize, t->vfreq_aspect))
650 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
651 hsize = t->hsize * 8 + 248;
652 /* vrefresh_rate = vfreq + 60 */
653 vrefresh_rate = vfreq + 60;
654 /* the vdisplay is calculated based on the aspect ratio */
655 if (aspect_ratio == 0) {
659 vsize = (hsize * 10) / 16;
660 } else if (aspect_ratio == 1)
661 vsize = (hsize * 3) / 4;
662 else if (aspect_ratio == 2)
663 vsize = (hsize * 4) / 5;
665 vsize = (hsize * 9) / 16;
667 /* HDTV hack, part 1 */
668 if (vrefresh_rate == 60 &&
669 ((hsize == 1360 && vsize == 765) ||
670 (hsize == 1368 && vsize == 769))) {
676 * If this connector already has a mode for this size and refresh
677 * rate (because it came from detailed or CVT info), use that
678 * instead. This way we don't have to guess at interlace or
681 list_for_each_entry(m, &connector->probed_modes, head)
682 if (m->hdisplay == hsize && m->vdisplay == vsize &&
683 drm_mode_vrefresh(m) == vrefresh_rate)
686 /* HDTV hack, part 2 */
687 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
688 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
690 mode->hdisplay = 1366;
691 mode->hsync_start = mode->hsync_start - 1;
692 mode->hsync_end = mode->hsync_end - 1;
696 /* check whether it can be found in default mode table */
697 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate);
701 switch (timing_level) {
705 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
709 * This is potentially wrong if there's ever a monitor with
710 * more than one ranges section, each claiming a different
711 * secondary GTF curve. Please don't do that.
713 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
714 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
716 mode = drm_gtf_mode_complex(dev, hsize, vsize,
725 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
733 * EDID is delightfully ambiguous about how interlaced modes are to be
734 * encoded. Our internal representation is of frame height, but some
735 * HDTV detailed timings are encoded as field height.
737 * The format list here is from CEA, in frame size. Technically we
738 * should be checking refresh rate too. Whatever.
741 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
742 struct detailed_pixel_timing *pt)
745 static const struct {
747 } cea_interlaced[] = {
756 static const int n_sizes =
757 sizeof(cea_interlaced)/sizeof(cea_interlaced[0]);
759 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
762 for (i = 0; i < n_sizes; i++) {
763 if ((mode->hdisplay == cea_interlaced[i].w) &&
764 (mode->vdisplay == cea_interlaced[i].h / 2)) {
766 mode->vsync_start *= 2;
767 mode->vsync_end *= 2;
773 mode->flags |= DRM_MODE_FLAG_INTERLACE;
777 * drm_mode_detailed - create a new mode from an EDID detailed timing section
778 * @dev: DRM device (needed to create new mode)
780 * @timing: EDID detailed timing info
781 * @quirks: quirks to apply
783 * An EDID detailed timing block contains enough info for us to create and
784 * return a new struct drm_display_mode.
786 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
788 struct detailed_timing *timing,
791 struct drm_display_mode *mode;
792 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
793 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
794 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
795 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
796 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
797 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
798 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
799 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
800 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
802 /* ignore tiny modes */
803 if (hactive < 64 || vactive < 64)
806 if (pt->misc & DRM_EDID_PT_STEREO) {
807 printk(KERN_WARNING "stereo mode not supported\n");
810 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
811 printk(KERN_WARNING "composite sync not supported\n");
814 /* it is incorrect if hsync/vsync width is zero */
815 if (!hsync_pulse_width || !vsync_pulse_width) {
816 DRM_DEBUG_KMS("Incorrect Detailed timing. "
817 "Wrong Hsync/Vsync pulse width\n");
820 mode = drm_mode_create(dev);
824 mode->type = DRM_MODE_TYPE_DRIVER;
826 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
827 timing->pixel_clock = cpu_to_le16(1088);
829 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
831 mode->hdisplay = hactive;
832 mode->hsync_start = mode->hdisplay + hsync_offset;
833 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
834 mode->htotal = mode->hdisplay + hblank;
836 mode->vdisplay = vactive;
837 mode->vsync_start = mode->vdisplay + vsync_offset;
838 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
839 mode->vtotal = mode->vdisplay + vblank;
841 /* Some EDIDs have bogus h/vtotal values */
842 if (mode->hsync_end > mode->htotal)
843 mode->htotal = mode->hsync_end + 1;
844 if (mode->vsync_end > mode->vtotal)
845 mode->vtotal = mode->vsync_end + 1;
847 drm_mode_do_interlace_quirk(mode, pt);
849 drm_mode_set_name(mode);
851 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
852 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
855 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
856 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
857 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
858 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
860 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
861 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
863 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
864 mode->width_mm *= 10;
865 mode->height_mm *= 10;
868 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
869 mode->width_mm = edid->width_cm * 10;
870 mode->height_mm = edid->height_cm * 10;
877 mode_is_rb(struct drm_display_mode *mode)
879 return (mode->htotal - mode->hdisplay == 160) &&
880 (mode->hsync_end - mode->hdisplay == 80) &&
881 (mode->hsync_end - mode->hsync_start == 32) &&
882 (mode->vsync_start - mode->vdisplay == 3);
886 mode_in_hsync_range(struct drm_display_mode *mode, struct edid *edid, u8 *t)
888 int hsync, hmin, hmax;
891 if (edid->revision >= 4)
892 hmin += ((t[4] & 0x04) ? 255 : 0);
894 if (edid->revision >= 4)
895 hmax += ((t[4] & 0x08) ? 255 : 0);
896 hsync = drm_mode_hsync(mode);
898 return (hsync <= hmax && hsync >= hmin);
902 mode_in_vsync_range(struct drm_display_mode *mode, struct edid *edid, u8 *t)
904 int vsync, vmin, vmax;
907 if (edid->revision >= 4)
908 vmin += ((t[4] & 0x01) ? 255 : 0);
910 if (edid->revision >= 4)
911 vmax += ((t[4] & 0x02) ? 255 : 0);
912 vsync = drm_mode_vrefresh(mode);
914 return (vsync <= vmax && vsync >= vmin);
918 range_pixel_clock(struct edid *edid, u8 *t)
921 if (t[9] == 0 || t[9] == 255)
924 /* 1.4 with CVT support gives us real precision, yay */
925 if (edid->revision >= 4 && t[10] == 0x04)
926 return (t[9] * 10000) - ((t[12] >> 2) * 250);
928 /* 1.3 is pathetic, so fuzz up a bit */
929 return t[9] * 10000 + 5001;
933 mode_in_range(struct drm_display_mode *mode, struct edid *edid,
934 struct detailed_timing *timing)
937 u8 *t = (u8 *)timing;
939 if (!mode_in_hsync_range(mode, edid, t))
942 if (!mode_in_vsync_range(mode, edid, t))
945 if ((max_clock = range_pixel_clock(edid, t)))
946 if (mode->clock > max_clock)
949 /* 1.4 max horizontal check */
950 if (edid->revision >= 4 && t[10] == 0x04)
951 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
954 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
961 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
962 * need to account for them.
965 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
966 struct detailed_timing *timing)
969 struct drm_display_mode *newmode;
970 struct drm_device *dev = connector->dev;
972 for (i = 0; i < drm_num_dmt_modes; i++) {
973 if (mode_in_range(drm_dmt_modes + i, edid, timing)) {
974 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
976 drm_mode_probed_add(connector, newmode);
986 do_inferred_modes(struct detailed_timing *timing, void *c)
988 struct detailed_mode_closure *closure = c;
989 struct detailed_non_pixel *data = &timing->data.other_data;
990 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF);
992 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE)
993 closure->modes += drm_gtf_modes_for_range(closure->connector,
999 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1001 struct detailed_mode_closure closure = {
1002 connector, edid, 0, 0, 0
1005 if (version_greater(edid, 1, 0))
1006 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1009 return closure.modes;
1013 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1015 int i, j, m, modes = 0;
1016 struct drm_display_mode *mode;
1017 u8 *est = ((u8 *)timing) + 5;
1019 for (i = 0; i < 6; i++) {
1020 for (j = 7; j > 0; j--) {
1021 m = (i * 8) + (7 - j);
1022 if (m >= num_est3_modes)
1024 if (est[i] & (1 << j)) {
1025 mode = drm_mode_find_dmt(connector->dev,
1029 /*, est3_modes[m].rb */);
1031 drm_mode_probed_add(connector, mode);
1042 do_established_modes(struct detailed_timing *timing, void *c)
1044 struct detailed_mode_closure *closure = c;
1045 struct detailed_non_pixel *data = &timing->data.other_data;
1047 if (data->type == EDID_DETAIL_EST_TIMINGS)
1048 closure->modes += drm_est3_modes(closure->connector, timing);
1052 * add_established_modes - get est. modes from EDID and add them
1053 * @edid: EDID block to scan
1055 * Each EDID block contains a bitmap of the supported "established modes" list
1056 * (defined above). Tease them out and add them to the global modes list.
1059 add_established_modes(struct drm_connector *connector, struct edid *edid)
1061 struct drm_device *dev = connector->dev;
1062 unsigned long est_bits = edid->established_timings.t1 |
1063 (edid->established_timings.t2 << 8) |
1064 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1066 struct detailed_mode_closure closure = {
1067 connector, edid, 0, 0, 0
1070 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1071 if (est_bits & (1<<i)) {
1072 struct drm_display_mode *newmode;
1073 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1075 drm_mode_probed_add(connector, newmode);
1081 if (version_greater(edid, 1, 0))
1082 drm_for_each_detailed_block((u8 *)edid,
1083 do_established_modes, &closure);
1085 return modes + closure.modes;
1089 do_standard_modes(struct detailed_timing *timing, void *c)
1091 struct detailed_mode_closure *closure = c;
1092 struct detailed_non_pixel *data = &timing->data.other_data;
1093 struct drm_connector *connector = closure->connector;
1094 struct edid *edid = closure->edid;
1096 if (data->type == EDID_DETAIL_STD_MODES) {
1098 for (i = 0; i < 6; i++) {
1099 struct std_timing *std;
1100 struct drm_display_mode *newmode;
1102 std = &data->data.timings[i];
1103 newmode = drm_mode_std(connector, edid, std,
1106 drm_mode_probed_add(connector, newmode);
1114 * add_standard_modes - get std. modes from EDID and add them
1115 * @edid: EDID block to scan
1117 * Standard modes can be calculated using the appropriate standard (DMT,
1118 * GTF or CVT. Grab them from @edid and add them to the list.
1121 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1124 struct detailed_mode_closure closure = {
1125 connector, edid, 0, 0, 0
1128 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1129 struct drm_display_mode *newmode;
1131 newmode = drm_mode_std(connector, edid,
1132 &edid->standard_timings[i],
1135 drm_mode_probed_add(connector, newmode);
1140 if (version_greater(edid, 1, 0))
1141 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1144 /* XXX should also look for standard codes in VTB blocks */
1146 return modes + closure.modes;
1149 static int drm_cvt_modes(struct drm_connector *connector,
1150 struct detailed_timing *timing)
1152 int i, j, modes = 0;
1153 struct drm_display_mode *newmode;
1154 struct drm_device *dev = connector->dev;
1155 struct cvt_timing *cvt;
1156 const int rates[] = { 60, 85, 75, 60, 50 };
1157 const u8 empty[3] = { 0, 0, 0 };
1159 for (i = 0; i < 4; i++) {
1160 int uninitialized_var(width), height;
1161 cvt = &(timing->data.other_data.data.cvt[i]);
1163 if (!memcmp(cvt->code, empty, 3))
1166 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1167 switch (cvt->code[1] & 0x0c) {
1169 width = height * 4 / 3;
1172 width = height * 16 / 9;
1175 width = height * 16 / 10;
1178 width = height * 15 / 9;
1182 for (j = 1; j < 5; j++) {
1183 if (cvt->code[2] & (1 << j)) {
1184 newmode = drm_cvt_mode(dev, width, height,
1188 drm_mode_probed_add(connector, newmode);
1199 do_cvt_mode(struct detailed_timing *timing, void *c)
1201 struct detailed_mode_closure *closure = c;
1202 struct detailed_non_pixel *data = &timing->data.other_data;
1204 if (data->type == EDID_DETAIL_CVT_3BYTE)
1205 closure->modes += drm_cvt_modes(closure->connector, timing);
1209 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1211 struct detailed_mode_closure closure = {
1212 connector, edid, 0, 0, 0
1215 if (version_greater(edid, 1, 2))
1216 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1218 /* XXX should also look for CVT codes in VTB blocks */
1220 return closure.modes;
1224 do_detailed_mode(struct detailed_timing *timing, void *c)
1226 struct detailed_mode_closure *closure = c;
1227 struct drm_display_mode *newmode;
1229 if (timing->pixel_clock) {
1230 newmode = drm_mode_detailed(closure->connector->dev,
1231 closure->edid, timing,
1236 if (closure->preferred)
1237 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1239 drm_mode_probed_add(closure->connector, newmode);
1241 closure->preferred = 0;
1246 * add_detailed_modes - Add modes from detailed timings
1247 * @connector: attached connector
1248 * @edid: EDID block to scan
1249 * @quirks: quirks to apply
1252 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1255 struct detailed_mode_closure closure = {
1263 if (closure.preferred && !version_greater(edid, 1, 3))
1265 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1267 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1269 return closure.modes;
1272 #define HDMI_IDENTIFIER 0x000C03
1273 #define VENDOR_BLOCK 0x03
1275 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1276 * @edid: monitor EDID information
1278 * Parse the CEA extension according to CEA-861-B.
1279 * Return true if HDMI, false if not or unknown.
1281 bool drm_detect_hdmi_monitor(struct edid *edid)
1283 char *edid_ext = NULL;
1285 int start_offset, end_offset;
1286 bool is_hdmi = false;
1288 /* No EDID or EDID extensions */
1289 if (edid == NULL || edid->extensions == 0)
1292 /* Find CEA extension */
1293 for (i = 0; i < edid->extensions; i++) {
1294 edid_ext = (char *)edid + EDID_LENGTH * (i + 1);
1295 /* This block is CEA extension */
1296 if (edid_ext[0] == 0x02)
1300 if (i == edid->extensions)
1303 /* Data block offset in CEA extension block */
1305 end_offset = edid_ext[2];
1308 * Because HDMI identifier is in Vendor Specific Block,
1309 * search it from all data blocks of CEA extension.
1311 for (i = start_offset; i < end_offset;
1312 /* Increased by data block len */
1313 i += ((edid_ext[i] & 0x1f) + 1)) {
1314 /* Find vendor specific block */
1315 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1316 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1317 edid_ext[i + 3] << 16;
1318 /* Find HDMI identifier */
1319 if (hdmi_id == HDMI_IDENTIFIER)
1328 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1331 * drm_add_edid_modes - add modes from EDID data, if available
1332 * @connector: connector we're probing
1335 * Add the specified modes to the connector's mode list.
1337 * Return number of modes added or 0 if we couldn't find any.
1339 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1347 if (!drm_edid_is_valid(edid)) {
1348 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1349 drm_get_connector_name(connector));
1353 quirks = edid_get_quirks(edid);
1356 * EDID spec says modes should be preferred in this order:
1357 * - preferred detailed mode
1358 * - other detailed modes from base block
1359 * - detailed modes from extension blocks
1360 * - CVT 3-byte code modes
1361 * - standard timing codes
1362 * - established timing codes
1363 * - modes inferred from GTF or CVT range information
1365 * We get this pretty much right.
1367 * XXX order for additional mode types in extension blocks?
1369 num_modes += add_detailed_modes(connector, edid, quirks);
1370 num_modes += add_cvt_modes(connector, edid);
1371 num_modes += add_standard_modes(connector, edid);
1372 num_modes += add_established_modes(connector, edid);
1373 num_modes += add_inferred_modes(connector, edid);
1375 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1376 edid_fixup_preferred(connector, quirks);
1378 connector->display_info.width_mm = edid->width_cm * 10;
1379 connector->display_info.height_mm = edid->height_cm * 10;
1383 EXPORT_SYMBOL(drm_add_edid_modes);
1386 * drm_add_modes_noedid - add modes for the connectors without EDID
1387 * @connector: connector we're probing
1388 * @hdisplay: the horizontal display limit
1389 * @vdisplay: the vertical display limit
1391 * Add the specified modes to the connector's mode list. Only when the
1392 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1394 * Return number of modes added or 0 if we couldn't find any.
1396 int drm_add_modes_noedid(struct drm_connector *connector,
1397 int hdisplay, int vdisplay)
1399 int i, count, num_modes = 0;
1400 struct drm_display_mode *mode, *ptr;
1401 struct drm_device *dev = connector->dev;
1403 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1409 for (i = 0; i < count; i++) {
1410 ptr = &drm_dmt_modes[i];
1411 if (hdisplay && vdisplay) {
1413 * Only when two are valid, they will be used to check
1414 * whether the mode should be added to the mode list of
1417 if (ptr->hdisplay > hdisplay ||
1418 ptr->vdisplay > vdisplay)
1421 if (drm_mode_vrefresh(ptr) > 61)
1423 mode = drm_mode_duplicate(dev, ptr);
1425 drm_mode_probed_add(connector, mode);
1431 EXPORT_SYMBOL(drm_add_modes_noedid);