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>
35 #include "drm_edid_modes.h"
37 #define version_greater(edid, maj, min) \
38 (((edid)->version > (maj)) || \
39 ((edid)->version == (maj) && (edid)->revision > (min)))
41 #define EDID_EST_TIMINGS 16
42 #define EDID_STD_TIMINGS 8
43 #define EDID_DETAILED_TIMINGS 4
46 * EDID blocks out in the wild have a variety of bugs, try to collect
47 * them here (note that userspace may work around broken monitors first,
48 * but fixes should make their way here so that the kernel "just works"
49 * on as many displays as possible).
52 /* First detailed mode wrong, use largest 60Hz mode */
53 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
54 /* Reported 135MHz pixel clock is too high, needs adjustment */
55 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
56 /* Prefer the largest mode at 75 Hz */
57 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
58 /* Detail timing is in cm not mm */
59 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
60 /* Detailed timing descriptors have bogus size values, so just take the
61 * maximum size and use that.
63 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
64 /* Monitor forgot to set the first detailed is preferred bit. */
65 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
66 /* use +hsync +vsync for detailed mode */
67 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
69 struct detailed_mode_closure {
70 struct drm_connector *connector;
82 static struct edid_quirk {
86 } edid_quirk_list[] = {
88 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
90 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
92 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
94 /* Belinea 10 15 55 */
95 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
96 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
98 /* Envision Peripherals, Inc. EN-7100e */
99 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
100 /* Envision EN2028 */
101 { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
103 /* Funai Electronics PM36B */
104 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
105 EDID_QUIRK_DETAILED_IN_CM },
107 /* LG Philips LCD LP154W01-A5 */
108 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
109 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
111 /* Philips 107p5 CRT */
112 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
115 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
117 /* Samsung SyncMaster 205BW. Note: irony */
118 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
119 /* Samsung SyncMaster 22[5-6]BW */
120 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
121 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
124 /*** DDC fetch and block validation ***/
126 static const u8 edid_header[] = {
127 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
131 * Sanity check the EDID block (base or extension). Return 0 if the block
132 * doesn't check out, or 1 if it's valid.
135 drm_edid_block_valid(u8 *raw_edid)
139 struct edid *edid = (struct edid *)raw_edid;
141 if (raw_edid[0] == 0x00) {
144 for (i = 0; i < sizeof(edid_header); i++)
145 if (raw_edid[i] == edid_header[i])
149 else if (score >= 6) {
150 DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
151 memcpy(raw_edid, edid_header, sizeof(edid_header));
157 for (i = 0; i < EDID_LENGTH; i++)
160 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
162 /* allow CEA to slide through, switches mangle this */
163 if (raw_edid[0] != 0x02)
167 /* per-block-type checks */
168 switch (raw_edid[0]) {
170 if (edid->version != 1) {
171 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
175 if (edid->revision > 4)
176 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
187 printk(KERN_ERR "Raw EDID:\n");
188 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
189 printk(KERN_ERR "\n");
195 * drm_edid_is_valid - sanity check EDID data
198 * Sanity-check an entire EDID record (including extensions)
200 bool drm_edid_is_valid(struct edid *edid)
203 u8 *raw = (u8 *)edid;
208 for (i = 0; i <= edid->extensions; i++)
209 if (!drm_edid_block_valid(raw + i * EDID_LENGTH))
214 EXPORT_SYMBOL(drm_edid_is_valid);
216 #define DDC_ADDR 0x50
217 #define DDC_SEGMENT_ADDR 0x30
219 * Get EDID information via I2C.
221 * \param adapter : i2c device adaptor
222 * \param buf : EDID data buffer to be filled
223 * \param len : EDID data buffer length
224 * \return 0 on success or -1 on failure.
226 * Try to fetch EDID information by calling i2c driver function.
229 drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
232 unsigned char start = block * EDID_LENGTH;
233 int ret, retries = 5;
235 /* The core i2c driver will automatically retry the transfer if the
236 * adapter reports EAGAIN. However, we find that bit-banging transfers
237 * are susceptible to errors under a heavily loaded machine and
238 * generate spurious NAKs and timeouts. Retrying the transfer
239 * of the individual block a few times seems to overcome this.
242 struct i2c_msg msgs[] = {
255 ret = i2c_transfer(adapter, msgs, 2);
256 } while (ret != 2 && --retries);
258 return ret == 2 ? 0 : -1;
261 static bool drm_edid_is_zero(u8 *in_edid, int length)
264 u32 *raw_edid = (u32 *)in_edid;
266 for (i = 0; i < length / 4; i++)
267 if (*(raw_edid + i) != 0)
273 drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
275 int i, j = 0, valid_extensions = 0;
278 if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
281 /* base block fetch */
282 for (i = 0; i < 4; i++) {
283 if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
285 if (drm_edid_block_valid(block))
287 if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
288 connector->null_edid_counter++;
295 /* if there's no extensions, we're done */
296 if (block[0x7e] == 0)
299 new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
304 for (j = 1; j <= block[0x7e]; j++) {
305 for (i = 0; i < 4; i++) {
306 if (drm_do_probe_ddc_edid(adapter,
307 block + (valid_extensions + 1) * EDID_LENGTH,
310 if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) {
316 dev_warn(connector->dev->dev,
317 "%s: Ignoring invalid EDID block %d.\n",
318 drm_get_connector_name(connector), j);
321 if (valid_extensions != block[0x7e]) {
322 block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
323 block[0x7e] = valid_extensions;
324 new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
333 dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
334 drm_get_connector_name(connector), j);
342 * Probe DDC presence.
344 * \param adapter : i2c device adaptor
345 * \return 1 on success
348 drm_probe_ddc(struct i2c_adapter *adapter)
352 return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
356 * drm_get_edid - get EDID data, if available
357 * @connector: connector we're probing
358 * @adapter: i2c adapter to use for DDC
360 * Poke the given i2c channel to grab EDID data if possible. If found,
361 * attach it to the connector.
363 * Return edid data or NULL if we couldn't find any.
365 struct edid *drm_get_edid(struct drm_connector *connector,
366 struct i2c_adapter *adapter)
368 struct edid *edid = NULL;
370 if (drm_probe_ddc(adapter))
371 edid = (struct edid *)drm_do_get_edid(connector, adapter);
373 connector->display_info.raw_edid = (char *)edid;
378 EXPORT_SYMBOL(drm_get_edid);
380 /*** EDID parsing ***/
383 * edid_vendor - match a string against EDID's obfuscated vendor field
384 * @edid: EDID to match
385 * @vendor: vendor string
387 * Returns true if @vendor is in @edid, false otherwise
389 static bool edid_vendor(struct edid *edid, char *vendor)
393 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
394 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
395 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
396 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
398 return !strncmp(edid_vendor, vendor, 3);
402 * edid_get_quirks - return quirk flags for a given EDID
403 * @edid: EDID to process
405 * This tells subsequent routines what fixes they need to apply.
407 static u32 edid_get_quirks(struct edid *edid)
409 struct edid_quirk *quirk;
412 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
413 quirk = &edid_quirk_list[i];
415 if (edid_vendor(edid, quirk->vendor) &&
416 (EDID_PRODUCT_ID(edid) == quirk->product_id))
417 return quirk->quirks;
423 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
424 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
427 * edid_fixup_preferred - set preferred modes based on quirk list
428 * @connector: has mode list to fix up
429 * @quirks: quirks list
431 * Walk the mode list for @connector, clearing the preferred status
432 * on existing modes and setting it anew for the right mode ala @quirks.
434 static void edid_fixup_preferred(struct drm_connector *connector,
437 struct drm_display_mode *t, *cur_mode, *preferred_mode;
438 int target_refresh = 0;
440 if (list_empty(&connector->probed_modes))
443 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
445 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
448 preferred_mode = list_first_entry(&connector->probed_modes,
449 struct drm_display_mode, head);
451 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
452 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
454 if (cur_mode == preferred_mode)
457 /* Largest mode is preferred */
458 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
459 preferred_mode = cur_mode;
461 /* At a given size, try to get closest to target refresh */
462 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
463 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
464 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
465 preferred_mode = cur_mode;
469 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
472 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
473 int hsize, int vsize, int fresh)
475 struct drm_display_mode *mode = NULL;
478 for (i = 0; i < drm_num_dmt_modes; i++) {
479 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
480 if (hsize == ptr->hdisplay &&
481 vsize == ptr->vdisplay &&
482 fresh == drm_mode_vrefresh(ptr)) {
483 /* get the expected default mode */
484 mode = drm_mode_duplicate(dev, ptr);
490 EXPORT_SYMBOL(drm_mode_find_dmt);
492 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
495 cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
498 u8 rev = ext[0x01], d = ext[0x02];
499 u8 *det_base = ext + d;
506 /* have to infer how many blocks we have, check pixel clock */
507 for (i = 0; i < 6; i++)
508 if (det_base[18*i] || det_base[18*i+1])
513 n = min(ext[0x03] & 0x0f, 6);
517 for (i = 0; i < n; i++)
518 cb((struct detailed_timing *)(det_base + 18 * i), closure);
522 vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
524 unsigned int i, n = min((int)ext[0x02], 6);
525 u8 *det_base = ext + 5;
528 return; /* unknown version */
530 for (i = 0; i < n; i++)
531 cb((struct detailed_timing *)(det_base + 18 * i), closure);
535 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
538 struct edid *edid = (struct edid *)raw_edid;
543 for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
544 cb(&(edid->detailed_timings[i]), closure);
546 for (i = 1; i <= raw_edid[0x7e]; i++) {
547 u8 *ext = raw_edid + (i * EDID_LENGTH);
550 cea_for_each_detailed_block(ext, cb, closure);
553 vtb_for_each_detailed_block(ext, cb, closure);
562 is_rb(struct detailed_timing *t, void *data)
565 if (r[3] == EDID_DETAIL_MONITOR_RANGE)
567 *(bool *)data = true;
570 /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
572 drm_monitor_supports_rb(struct edid *edid)
574 if (edid->revision >= 4) {
576 drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
580 return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
584 find_gtf2(struct detailed_timing *t, void *data)
587 if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
591 /* Secondary GTF curve kicks in above some break frequency */
593 drm_gtf2_hbreak(struct edid *edid)
596 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
597 return r ? (r[12] * 2) : 0;
601 drm_gtf2_2c(struct edid *edid)
604 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
605 return r ? r[13] : 0;
609 drm_gtf2_m(struct edid *edid)
612 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
613 return r ? (r[15] << 8) + r[14] : 0;
617 drm_gtf2_k(struct edid *edid)
620 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
621 return r ? r[16] : 0;
625 drm_gtf2_2j(struct edid *edid)
628 drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
629 return r ? r[17] : 0;
633 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
634 * @edid: EDID block to scan
636 static int standard_timing_level(struct edid *edid)
638 if (edid->revision >= 2) {
639 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
641 if (drm_gtf2_hbreak(edid))
649 * 0 is reserved. The spec says 0x01 fill for unused timings. Some old
650 * monitors fill with ascii space (0x20) instead.
653 bad_std_timing(u8 a, u8 b)
655 return (a == 0x00 && b == 0x00) ||
656 (a == 0x01 && b == 0x01) ||
657 (a == 0x20 && b == 0x20);
661 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
662 * @t: standard timing params
663 * @timing_level: standard timing level
665 * Take the standard timing params (in this case width, aspect, and refresh)
666 * and convert them into a real mode using CVT/GTF/DMT.
668 static struct drm_display_mode *
669 drm_mode_std(struct drm_connector *connector, struct edid *edid,
670 struct std_timing *t, int revision)
672 struct drm_device *dev = connector->dev;
673 struct drm_display_mode *m, *mode = NULL;
676 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
677 >> EDID_TIMING_ASPECT_SHIFT;
678 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
679 >> EDID_TIMING_VFREQ_SHIFT;
680 int timing_level = standard_timing_level(edid);
682 if (bad_std_timing(t->hsize, t->vfreq_aspect))
685 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
686 hsize = t->hsize * 8 + 248;
687 /* vrefresh_rate = vfreq + 60 */
688 vrefresh_rate = vfreq + 60;
689 /* the vdisplay is calculated based on the aspect ratio */
690 if (aspect_ratio == 0) {
694 vsize = (hsize * 10) / 16;
695 } else if (aspect_ratio == 1)
696 vsize = (hsize * 3) / 4;
697 else if (aspect_ratio == 2)
698 vsize = (hsize * 4) / 5;
700 vsize = (hsize * 9) / 16;
702 /* HDTV hack, part 1 */
703 if (vrefresh_rate == 60 &&
704 ((hsize == 1360 && vsize == 765) ||
705 (hsize == 1368 && vsize == 769))) {
711 * If this connector already has a mode for this size and refresh
712 * rate (because it came from detailed or CVT info), use that
713 * instead. This way we don't have to guess at interlace or
716 list_for_each_entry(m, &connector->probed_modes, head)
717 if (m->hdisplay == hsize && m->vdisplay == vsize &&
718 drm_mode_vrefresh(m) == vrefresh_rate)
721 /* HDTV hack, part 2 */
722 if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
723 mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
725 mode->hdisplay = 1366;
726 mode->hsync_start = mode->hsync_start - 1;
727 mode->hsync_end = mode->hsync_end - 1;
731 /* check whether it can be found in default mode table */
732 mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate);
736 switch (timing_level) {
740 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
744 * This is potentially wrong if there's ever a monitor with
745 * more than one ranges section, each claiming a different
746 * secondary GTF curve. Please don't do that.
748 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
749 if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
751 mode = drm_gtf_mode_complex(dev, hsize, vsize,
760 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
768 * EDID is delightfully ambiguous about how interlaced modes are to be
769 * encoded. Our internal representation is of frame height, but some
770 * HDTV detailed timings are encoded as field height.
772 * The format list here is from CEA, in frame size. Technically we
773 * should be checking refresh rate too. Whatever.
776 drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
777 struct detailed_pixel_timing *pt)
780 static const struct {
782 } cea_interlaced[] = {
792 if (!(pt->misc & DRM_EDID_PT_INTERLACED))
795 for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
796 if ((mode->hdisplay == cea_interlaced[i].w) &&
797 (mode->vdisplay == cea_interlaced[i].h / 2)) {
799 mode->vsync_start *= 2;
800 mode->vsync_end *= 2;
806 mode->flags |= DRM_MODE_FLAG_INTERLACE;
810 * drm_mode_detailed - create a new mode from an EDID detailed timing section
811 * @dev: DRM device (needed to create new mode)
813 * @timing: EDID detailed timing info
814 * @quirks: quirks to apply
816 * An EDID detailed timing block contains enough info for us to create and
817 * return a new struct drm_display_mode.
819 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
821 struct detailed_timing *timing,
824 struct drm_display_mode *mode;
825 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
826 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
827 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
828 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
829 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
830 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
831 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
832 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
833 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
835 /* ignore tiny modes */
836 if (hactive < 64 || vactive < 64)
839 if (pt->misc & DRM_EDID_PT_STEREO) {
840 printk(KERN_WARNING "stereo mode not supported\n");
843 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
844 printk(KERN_WARNING "composite sync not supported\n");
847 /* it is incorrect if hsync/vsync width is zero */
848 if (!hsync_pulse_width || !vsync_pulse_width) {
849 DRM_DEBUG_KMS("Incorrect Detailed timing. "
850 "Wrong Hsync/Vsync pulse width\n");
853 mode = drm_mode_create(dev);
857 mode->type = DRM_MODE_TYPE_DRIVER;
859 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
860 timing->pixel_clock = cpu_to_le16(1088);
862 mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
864 mode->hdisplay = hactive;
865 mode->hsync_start = mode->hdisplay + hsync_offset;
866 mode->hsync_end = mode->hsync_start + hsync_pulse_width;
867 mode->htotal = mode->hdisplay + hblank;
869 mode->vdisplay = vactive;
870 mode->vsync_start = mode->vdisplay + vsync_offset;
871 mode->vsync_end = mode->vsync_start + vsync_pulse_width;
872 mode->vtotal = mode->vdisplay + vblank;
874 /* Some EDIDs have bogus h/vtotal values */
875 if (mode->hsync_end > mode->htotal)
876 mode->htotal = mode->hsync_end + 1;
877 if (mode->vsync_end > mode->vtotal)
878 mode->vtotal = mode->vsync_end + 1;
880 drm_mode_do_interlace_quirk(mode, pt);
882 drm_mode_set_name(mode);
884 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
885 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
888 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
889 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
890 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
891 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
893 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
894 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
896 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
897 mode->width_mm *= 10;
898 mode->height_mm *= 10;
901 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
902 mode->width_mm = edid->width_cm * 10;
903 mode->height_mm = edid->height_cm * 10;
910 mode_is_rb(const struct drm_display_mode *mode)
912 return (mode->htotal - mode->hdisplay == 160) &&
913 (mode->hsync_end - mode->hdisplay == 80) &&
914 (mode->hsync_end - mode->hsync_start == 32) &&
915 (mode->vsync_start - mode->vdisplay == 3);
919 mode_in_hsync_range(const struct drm_display_mode *mode,
920 struct edid *edid, u8 *t)
922 int hsync, hmin, hmax;
925 if (edid->revision >= 4)
926 hmin += ((t[4] & 0x04) ? 255 : 0);
928 if (edid->revision >= 4)
929 hmax += ((t[4] & 0x08) ? 255 : 0);
930 hsync = drm_mode_hsync(mode);
932 return (hsync <= hmax && hsync >= hmin);
936 mode_in_vsync_range(const struct drm_display_mode *mode,
937 struct edid *edid, u8 *t)
939 int vsync, vmin, vmax;
942 if (edid->revision >= 4)
943 vmin += ((t[4] & 0x01) ? 255 : 0);
945 if (edid->revision >= 4)
946 vmax += ((t[4] & 0x02) ? 255 : 0);
947 vsync = drm_mode_vrefresh(mode);
949 return (vsync <= vmax && vsync >= vmin);
953 range_pixel_clock(struct edid *edid, u8 *t)
956 if (t[9] == 0 || t[9] == 255)
959 /* 1.4 with CVT support gives us real precision, yay */
960 if (edid->revision >= 4 && t[10] == 0x04)
961 return (t[9] * 10000) - ((t[12] >> 2) * 250);
963 /* 1.3 is pathetic, so fuzz up a bit */
964 return t[9] * 10000 + 5001;
968 mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
969 struct detailed_timing *timing)
972 u8 *t = (u8 *)timing;
974 if (!mode_in_hsync_range(mode, edid, t))
977 if (!mode_in_vsync_range(mode, edid, t))
980 if ((max_clock = range_pixel_clock(edid, t)))
981 if (mode->clock > max_clock)
984 /* 1.4 max horizontal check */
985 if (edid->revision >= 4 && t[10] == 0x04)
986 if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
989 if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
996 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
997 * need to account for them.
1000 drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1001 struct detailed_timing *timing)
1004 struct drm_display_mode *newmode;
1005 struct drm_device *dev = connector->dev;
1007 for (i = 0; i < drm_num_dmt_modes; i++) {
1008 if (mode_in_range(drm_dmt_modes + i, edid, timing)) {
1009 newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1011 drm_mode_probed_add(connector, newmode);
1021 do_inferred_modes(struct detailed_timing *timing, void *c)
1023 struct detailed_mode_closure *closure = c;
1024 struct detailed_non_pixel *data = &timing->data.other_data;
1025 int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF);
1027 if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE)
1028 closure->modes += drm_gtf_modes_for_range(closure->connector,
1034 add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1036 struct detailed_mode_closure closure = {
1037 connector, edid, 0, 0, 0
1040 if (version_greater(edid, 1, 0))
1041 drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1044 return closure.modes;
1048 drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1050 int i, j, m, modes = 0;
1051 struct drm_display_mode *mode;
1052 u8 *est = ((u8 *)timing) + 5;
1054 for (i = 0; i < 6; i++) {
1055 for (j = 7; j > 0; j--) {
1056 m = (i * 8) + (7 - j);
1057 if (m >= ARRAY_SIZE(est3_modes))
1059 if (est[i] & (1 << j)) {
1060 mode = drm_mode_find_dmt(connector->dev,
1064 /*, est3_modes[m].rb */);
1066 drm_mode_probed_add(connector, mode);
1077 do_established_modes(struct detailed_timing *timing, void *c)
1079 struct detailed_mode_closure *closure = c;
1080 struct detailed_non_pixel *data = &timing->data.other_data;
1082 if (data->type == EDID_DETAIL_EST_TIMINGS)
1083 closure->modes += drm_est3_modes(closure->connector, timing);
1087 * add_established_modes - get est. modes from EDID and add them
1088 * @edid: EDID block to scan
1090 * Each EDID block contains a bitmap of the supported "established modes" list
1091 * (defined above). Tease them out and add them to the global modes list.
1094 add_established_modes(struct drm_connector *connector, struct edid *edid)
1096 struct drm_device *dev = connector->dev;
1097 unsigned long est_bits = edid->established_timings.t1 |
1098 (edid->established_timings.t2 << 8) |
1099 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
1101 struct detailed_mode_closure closure = {
1102 connector, edid, 0, 0, 0
1105 for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1106 if (est_bits & (1<<i)) {
1107 struct drm_display_mode *newmode;
1108 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1110 drm_mode_probed_add(connector, newmode);
1116 if (version_greater(edid, 1, 0))
1117 drm_for_each_detailed_block((u8 *)edid,
1118 do_established_modes, &closure);
1120 return modes + closure.modes;
1124 do_standard_modes(struct detailed_timing *timing, void *c)
1126 struct detailed_mode_closure *closure = c;
1127 struct detailed_non_pixel *data = &timing->data.other_data;
1128 struct drm_connector *connector = closure->connector;
1129 struct edid *edid = closure->edid;
1131 if (data->type == EDID_DETAIL_STD_MODES) {
1133 for (i = 0; i < 6; i++) {
1134 struct std_timing *std;
1135 struct drm_display_mode *newmode;
1137 std = &data->data.timings[i];
1138 newmode = drm_mode_std(connector, edid, std,
1141 drm_mode_probed_add(connector, newmode);
1149 * add_standard_modes - get std. modes from EDID and add them
1150 * @edid: EDID block to scan
1152 * Standard modes can be calculated using the appropriate standard (DMT,
1153 * GTF or CVT. Grab them from @edid and add them to the list.
1156 add_standard_modes(struct drm_connector *connector, struct edid *edid)
1159 struct detailed_mode_closure closure = {
1160 connector, edid, 0, 0, 0
1163 for (i = 0; i < EDID_STD_TIMINGS; i++) {
1164 struct drm_display_mode *newmode;
1166 newmode = drm_mode_std(connector, edid,
1167 &edid->standard_timings[i],
1170 drm_mode_probed_add(connector, newmode);
1175 if (version_greater(edid, 1, 0))
1176 drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1179 /* XXX should also look for standard codes in VTB blocks */
1181 return modes + closure.modes;
1184 static int drm_cvt_modes(struct drm_connector *connector,
1185 struct detailed_timing *timing)
1187 int i, j, modes = 0;
1188 struct drm_display_mode *newmode;
1189 struct drm_device *dev = connector->dev;
1190 struct cvt_timing *cvt;
1191 const int rates[] = { 60, 85, 75, 60, 50 };
1192 const u8 empty[3] = { 0, 0, 0 };
1194 for (i = 0; i < 4; i++) {
1195 int uninitialized_var(width), height;
1196 cvt = &(timing->data.other_data.data.cvt[i]);
1198 if (!memcmp(cvt->code, empty, 3))
1201 height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1202 switch (cvt->code[1] & 0x0c) {
1204 width = height * 4 / 3;
1207 width = height * 16 / 9;
1210 width = height * 16 / 10;
1213 width = height * 15 / 9;
1217 for (j = 1; j < 5; j++) {
1218 if (cvt->code[2] & (1 << j)) {
1219 newmode = drm_cvt_mode(dev, width, height,
1223 drm_mode_probed_add(connector, newmode);
1234 do_cvt_mode(struct detailed_timing *timing, void *c)
1236 struct detailed_mode_closure *closure = c;
1237 struct detailed_non_pixel *data = &timing->data.other_data;
1239 if (data->type == EDID_DETAIL_CVT_3BYTE)
1240 closure->modes += drm_cvt_modes(closure->connector, timing);
1244 add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1246 struct detailed_mode_closure closure = {
1247 connector, edid, 0, 0, 0
1250 if (version_greater(edid, 1, 2))
1251 drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1253 /* XXX should also look for CVT codes in VTB blocks */
1255 return closure.modes;
1259 do_detailed_mode(struct detailed_timing *timing, void *c)
1261 struct detailed_mode_closure *closure = c;
1262 struct drm_display_mode *newmode;
1264 if (timing->pixel_clock) {
1265 newmode = drm_mode_detailed(closure->connector->dev,
1266 closure->edid, timing,
1271 if (closure->preferred)
1272 newmode->type |= DRM_MODE_TYPE_PREFERRED;
1274 drm_mode_probed_add(closure->connector, newmode);
1276 closure->preferred = 0;
1281 * add_detailed_modes - Add modes from detailed timings
1282 * @connector: attached connector
1283 * @edid: EDID block to scan
1284 * @quirks: quirks to apply
1287 add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1290 struct detailed_mode_closure closure = {
1298 if (closure.preferred && !version_greater(edid, 1, 3))
1300 (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1302 drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1304 return closure.modes;
1307 #define HDMI_IDENTIFIER 0x000C03
1308 #define AUDIO_BLOCK 0x01
1309 #define VENDOR_BLOCK 0x03
1310 #define EDID_BASIC_AUDIO (1 << 6)
1313 * Search EDID for CEA extension block.
1315 u8 *drm_find_cea_extension(struct edid *edid)
1317 u8 *edid_ext = NULL;
1320 /* No EDID or EDID extensions */
1321 if (edid == NULL || edid->extensions == 0)
1324 /* Find CEA extension */
1325 for (i = 0; i < edid->extensions; i++) {
1326 edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1327 if (edid_ext[0] == CEA_EXT)
1331 if (i == edid->extensions)
1336 EXPORT_SYMBOL(drm_find_cea_extension);
1339 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1340 * @edid: monitor EDID information
1342 * Parse the CEA extension according to CEA-861-B.
1343 * Return true if HDMI, false if not or unknown.
1345 bool drm_detect_hdmi_monitor(struct edid *edid)
1349 int start_offset, end_offset;
1350 bool is_hdmi = false;
1352 edid_ext = drm_find_cea_extension(edid);
1356 /* Data block offset in CEA extension block */
1358 end_offset = edid_ext[2];
1361 * Because HDMI identifier is in Vendor Specific Block,
1362 * search it from all data blocks of CEA extension.
1364 for (i = start_offset; i < end_offset;
1365 /* Increased by data block len */
1366 i += ((edid_ext[i] & 0x1f) + 1)) {
1367 /* Find vendor specific block */
1368 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1369 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1370 edid_ext[i + 3] << 16;
1371 /* Find HDMI identifier */
1372 if (hdmi_id == HDMI_IDENTIFIER)
1381 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1384 * drm_detect_monitor_audio - check monitor audio capability
1386 * Monitor should have CEA extension block.
1387 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1388 * audio' only. If there is any audio extension block and supported
1389 * audio format, assume at least 'basic audio' support, even if 'basic
1390 * audio' is not defined in EDID.
1393 bool drm_detect_monitor_audio(struct edid *edid)
1397 bool has_audio = false;
1398 int start_offset, end_offset;
1400 edid_ext = drm_find_cea_extension(edid);
1404 has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1407 DRM_DEBUG_KMS("Monitor has basic audio support\n");
1411 /* Data block offset in CEA extension block */
1413 end_offset = edid_ext[2];
1415 for (i = start_offset; i < end_offset;
1416 i += ((edid_ext[i] & 0x1f) + 1)) {
1417 if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1419 for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1420 DRM_DEBUG_KMS("CEA audio format %d\n",
1421 (edid_ext[i + j] >> 3) & 0xf);
1428 EXPORT_SYMBOL(drm_detect_monitor_audio);
1431 * drm_add_display_info - pull display info out if present
1433 * @info: display info (attached to connector)
1435 * Grab any available display info and stuff it into the drm_display_info
1436 * structure that's part of the connector. Useful for tracking bpp and
1439 static void drm_add_display_info(struct edid *edid,
1440 struct drm_display_info *info)
1442 info->width_mm = edid->width_cm * 10;
1443 info->height_mm = edid->height_cm * 10;
1445 /* driver figures it out in this case */
1447 info->color_formats = 0;
1449 /* Only defined for 1.4 with digital displays */
1450 if (edid->revision < 4)
1453 if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1456 switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1457 case DRM_EDID_DIGITAL_DEPTH_6:
1460 case DRM_EDID_DIGITAL_DEPTH_8:
1463 case DRM_EDID_DIGITAL_DEPTH_10:
1466 case DRM_EDID_DIGITAL_DEPTH_12:
1469 case DRM_EDID_DIGITAL_DEPTH_14:
1472 case DRM_EDID_DIGITAL_DEPTH_16:
1475 case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1481 info->color_formats = DRM_COLOR_FORMAT_RGB444;
1482 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444)
1483 info->color_formats = DRM_COLOR_FORMAT_YCRCB444;
1484 if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422)
1485 info->color_formats = DRM_COLOR_FORMAT_YCRCB422;
1489 * drm_add_edid_modes - add modes from EDID data, if available
1490 * @connector: connector we're probing
1493 * Add the specified modes to the connector's mode list.
1495 * Return number of modes added or 0 if we couldn't find any.
1497 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1505 if (!drm_edid_is_valid(edid)) {
1506 dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1507 drm_get_connector_name(connector));
1511 quirks = edid_get_quirks(edid);
1514 * EDID spec says modes should be preferred in this order:
1515 * - preferred detailed mode
1516 * - other detailed modes from base block
1517 * - detailed modes from extension blocks
1518 * - CVT 3-byte code modes
1519 * - standard timing codes
1520 * - established timing codes
1521 * - modes inferred from GTF or CVT range information
1523 * We get this pretty much right.
1525 * XXX order for additional mode types in extension blocks?
1527 num_modes += add_detailed_modes(connector, edid, quirks);
1528 num_modes += add_cvt_modes(connector, edid);
1529 num_modes += add_standard_modes(connector, edid);
1530 num_modes += add_established_modes(connector, edid);
1531 num_modes += add_inferred_modes(connector, edid);
1533 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1534 edid_fixup_preferred(connector, quirks);
1536 drm_add_display_info(edid, &connector->display_info);
1540 EXPORT_SYMBOL(drm_add_edid_modes);
1543 * drm_add_modes_noedid - add modes for the connectors without EDID
1544 * @connector: connector we're probing
1545 * @hdisplay: the horizontal display limit
1546 * @vdisplay: the vertical display limit
1548 * Add the specified modes to the connector's mode list. Only when the
1549 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1551 * Return number of modes added or 0 if we couldn't find any.
1553 int drm_add_modes_noedid(struct drm_connector *connector,
1554 int hdisplay, int vdisplay)
1556 int i, count, num_modes = 0;
1557 struct drm_display_mode *mode;
1558 struct drm_device *dev = connector->dev;
1560 count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1566 for (i = 0; i < count; i++) {
1567 const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1568 if (hdisplay && vdisplay) {
1570 * Only when two are valid, they will be used to check
1571 * whether the mode should be added to the mode list of
1574 if (ptr->hdisplay > hdisplay ||
1575 ptr->vdisplay > vdisplay)
1578 if (drm_mode_vrefresh(ptr) > 61)
1580 mode = drm_mode_duplicate(dev, ptr);
1582 drm_mode_probed_add(connector, mode);
1588 EXPORT_SYMBOL(drm_add_modes_noedid);