2 * Copyright (c) 2006 Luc Verhaegen (quirks list)
3 * Copyright (c) 2007-2008 Intel Corporation
4 * Jesse Barnes <jesse.barnes@intel.com>
6 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
8 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sub license,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice (including the
18 * next paragraph) shall be included in all copies or substantial portions
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
29 #include <linux/kernel.h>
30 #include <linux/i2c.h>
31 #include <linux/i2c-algo-bit.h>
37 * - support EDID 1.4 (incl. CE blocks)
41 * EDID blocks out in the wild have a variety of bugs, try to collect
42 * them here (note that userspace may work around broken monitors first,
43 * but fixes should make their way here so that the kernel "just works"
44 * on as many displays as possible).
47 /* First detailed mode wrong, use largest 60Hz mode */
48 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0)
49 /* Reported 135MHz pixel clock is too high, needs adjustment */
50 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1)
51 /* Prefer the largest mode at 75 Hz */
52 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2)
53 /* Detail timing is in cm not mm */
54 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3)
55 /* Detailed timing descriptors have bogus size values, so just take the
56 * maximum size and use that.
58 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4)
59 /* Monitor forgot to set the first detailed is preferred bit. */
60 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
61 /* use +hsync +vsync for detailed mode */
62 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
64 static struct edid_quirk {
68 } edid_quirk_list[] = {
70 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
72 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
74 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
76 /* Belinea 10 15 55 */
77 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
78 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
80 /* Envision Peripherals, Inc. EN-7100e */
81 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
83 /* Funai Electronics PM36B */
84 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
85 EDID_QUIRK_DETAILED_IN_CM },
87 /* LG Philips LCD LP154W01-A5 */
88 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
89 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
91 /* Philips 107p5 CRT */
92 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
95 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
97 /* Samsung SyncMaster 205BW. Note: irony */
98 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
99 /* Samsung SyncMaster 22[5-6]BW */
100 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
101 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
105 /* Valid EDID header has these bytes */
106 static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
109 * edid_is_valid - sanity check EDID data
112 * Sanity check the EDID block by looking at the header, the version number
113 * and the checksum. Return 0 if the EDID doesn't check out, or 1 if it's
116 static bool edid_is_valid(struct edid *edid)
120 u8 *raw_edid = (u8 *)edid;
122 if (memcmp(edid->header, edid_header, sizeof(edid_header)))
124 if (edid->version != 1) {
125 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
128 if (edid->revision > 4)
129 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
131 for (i = 0; i < EDID_LENGTH; i++)
134 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
142 DRM_ERROR("Raw EDID:\n");
143 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
150 * edid_vendor - match a string against EDID's obfuscated vendor field
151 * @edid: EDID to match
152 * @vendor: vendor string
154 * Returns true if @vendor is in @edid, false otherwise
156 static bool edid_vendor(struct edid *edid, char *vendor)
160 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
161 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
162 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
163 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
165 return !strncmp(edid_vendor, vendor, 3);
169 * edid_get_quirks - return quirk flags for a given EDID
170 * @edid: EDID to process
172 * This tells subsequent routines what fixes they need to apply.
174 static u32 edid_get_quirks(struct edid *edid)
176 struct edid_quirk *quirk;
179 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
180 quirk = &edid_quirk_list[i];
182 if (edid_vendor(edid, quirk->vendor) &&
183 (EDID_PRODUCT_ID(edid) == quirk->product_id))
184 return quirk->quirks;
190 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
191 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
195 * edid_fixup_preferred - set preferred modes based on quirk list
196 * @connector: has mode list to fix up
197 * @quirks: quirks list
199 * Walk the mode list for @connector, clearing the preferred status
200 * on existing modes and setting it anew for the right mode ala @quirks.
202 static void edid_fixup_preferred(struct drm_connector *connector,
205 struct drm_display_mode *t, *cur_mode, *preferred_mode;
206 int target_refresh = 0;
208 if (list_empty(&connector->probed_modes))
211 if (quirks & EDID_QUIRK_PREFER_LARGE_60)
213 if (quirks & EDID_QUIRK_PREFER_LARGE_75)
216 preferred_mode = list_first_entry(&connector->probed_modes,
217 struct drm_display_mode, head);
219 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
220 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
222 if (cur_mode == preferred_mode)
225 /* Largest mode is preferred */
226 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
227 preferred_mode = cur_mode;
229 /* At a given size, try to get closest to target refresh */
230 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
231 MODE_REFRESH_DIFF(cur_mode, target_refresh) <
232 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
233 preferred_mode = cur_mode;
237 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
241 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
242 * @t: standard timing params
244 * Take the standard timing params (in this case width, aspect, and refresh)
245 * and convert them into a real mode using CVT.
247 * Punts for now, but should eventually use the FB layer's CVT based mode
250 struct drm_display_mode *drm_mode_std(struct drm_device *dev,
251 struct std_timing *t)
253 struct drm_display_mode *mode;
254 int hsize = t->hsize * 8 + 248, vsize;
256 mode = drm_mode_create(dev);
260 if (t->aspect_ratio == 0)
261 vsize = (hsize * 10) / 16;
262 else if (t->aspect_ratio == 1)
263 vsize = (hsize * 3) / 4;
264 else if (t->aspect_ratio == 2)
265 vsize = (hsize * 4) / 5;
267 vsize = (hsize * 9) / 16;
269 drm_mode_set_name(mode);
275 * drm_mode_detailed - create a new mode from an EDID detailed timing section
276 * @dev: DRM device (needed to create new mode)
278 * @timing: EDID detailed timing info
279 * @quirks: quirks to apply
281 * An EDID detailed timing block contains enough info for us to create and
282 * return a new struct drm_display_mode.
284 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
286 struct detailed_timing *timing,
289 struct drm_display_mode *mode;
290 struct detailed_pixel_timing *pt = &timing->data.pixel_data;
293 printk(KERN_WARNING "stereo mode not supported\n");
296 if (!pt->separate_sync) {
297 printk(KERN_WARNING "integrated sync not supported\n");
301 mode = drm_mode_create(dev);
305 mode->type = DRM_MODE_TYPE_DRIVER;
307 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
308 timing->pixel_clock = 1088;
310 mode->clock = timing->pixel_clock * 10;
312 mode->hdisplay = (pt->hactive_hi << 8) | pt->hactive_lo;
313 mode->hsync_start = mode->hdisplay + ((pt->hsync_offset_hi << 8) |
314 pt->hsync_offset_lo);
315 mode->hsync_end = mode->hsync_start +
316 ((pt->hsync_pulse_width_hi << 8) |
317 pt->hsync_pulse_width_lo);
318 mode->htotal = mode->hdisplay + ((pt->hblank_hi << 8) | pt->hblank_lo);
320 mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo;
321 mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 4) |
322 pt->vsync_offset_lo);
323 mode->vsync_end = mode->vsync_start +
324 ((pt->vsync_pulse_width_hi << 4) |
325 pt->vsync_pulse_width_lo);
326 mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo);
328 drm_mode_set_name(mode);
331 mode->flags |= DRM_MODE_FLAG_INTERLACE;
333 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
334 pt->hsync_positive = 1;
335 pt->vsync_positive = 1;
338 mode->flags |= pt->hsync_positive ? DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
339 mode->flags |= pt->vsync_positive ? DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
341 mode->width_mm = pt->width_mm_lo | (pt->width_mm_hi << 8);
342 mode->height_mm = pt->height_mm_lo | (pt->height_mm_hi << 8);
344 if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
345 mode->width_mm *= 10;
346 mode->height_mm *= 10;
349 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
350 mode->width_mm = edid->width_cm * 10;
351 mode->height_mm = edid->height_cm * 10;
358 * Detailed mode info for the EDID "established modes" data to use.
360 static struct drm_display_mode edid_est_modes[] = {
361 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
362 968, 1056, 0, 600, 601, 605, 628, 0,
363 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */
364 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824,
365 896, 1024, 0, 600, 601, 603, 625, 0,
366 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */
367 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656,
368 720, 840, 0, 480, 481, 484, 500, 0,
369 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */
370 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664,
371 704, 832, 0, 480, 489, 491, 520, 0,
372 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */
373 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704,
374 768, 864, 0, 480, 483, 486, 525, 0,
375 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */
376 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656,
377 752, 800, 0, 480, 490, 492, 525, 0,
378 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */
379 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738,
380 846, 900, 0, 400, 421, 423, 449, 0,
381 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */
382 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738,
383 846, 900, 0, 400, 412, 414, 449, 0,
384 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */
385 { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296,
386 1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
387 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */
388 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040,
389 1136, 1312, 0, 768, 769, 772, 800, 0,
390 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */
391 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048,
392 1184, 1328, 0, 768, 771, 777, 806, 0,
393 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */
394 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
395 1184, 1344, 0, 768, 771, 777, 806, 0,
396 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */
397 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032,
398 1208, 1264, 0, 768, 768, 776, 817, 0,
399 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */
400 { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864,
401 928, 1152, 0, 624, 625, 628, 667, 0,
402 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */
403 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816,
404 896, 1056, 0, 600, 601, 604, 625, 0,
405 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */
406 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856,
407 976, 1040, 0, 600, 637, 643, 666, 0,
408 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */
409 { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,
410 1344, 1600, 0, 864, 865, 868, 900, 0,
411 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */
414 #define EDID_EST_TIMINGS 16
415 #define EDID_STD_TIMINGS 8
416 #define EDID_DETAILED_TIMINGS 4
419 * add_established_modes - get est. modes from EDID and add them
420 * @edid: EDID block to scan
422 * Each EDID block contains a bitmap of the supported "established modes" list
423 * (defined above). Tease them out and add them to the global modes list.
425 static int add_established_modes(struct drm_connector *connector, struct edid *edid)
427 struct drm_device *dev = connector->dev;
428 unsigned long est_bits = edid->established_timings.t1 |
429 (edid->established_timings.t2 << 8) |
430 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
433 for (i = 0; i <= EDID_EST_TIMINGS; i++)
434 if (est_bits & (1<<i)) {
435 struct drm_display_mode *newmode;
436 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
438 drm_mode_probed_add(connector, newmode);
447 * add_standard_modes - get std. modes from EDID and add them
448 * @edid: EDID block to scan
450 * Standard modes can be calculated using the CVT standard. Grab them from
451 * @edid, calculate them, and add them to the list.
453 static int add_standard_modes(struct drm_connector *connector, struct edid *edid)
455 struct drm_device *dev = connector->dev;
458 for (i = 0; i < EDID_STD_TIMINGS; i++) {
459 struct std_timing *t = &edid->standard_timings[i];
460 struct drm_display_mode *newmode;
462 /* If std timings bytes are 1, 1 it's empty */
463 if (t->hsize == 1 && (t->aspect_ratio | t->vfreq) == 1)
466 newmode = drm_mode_std(dev, &edid->standard_timings[i]);
468 drm_mode_probed_add(connector, newmode);
477 * add_detailed_modes - get detailed mode info from EDID data
478 * @connector: attached connector
479 * @edid: EDID block to scan
480 * @quirks: quirks to apply
482 * Some of the detailed timing sections may contain mode information. Grab
483 * it and add it to the list.
485 static int add_detailed_info(struct drm_connector *connector,
486 struct edid *edid, u32 quirks)
488 struct drm_device *dev = connector->dev;
491 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) {
492 struct detailed_timing *timing = &edid->detailed_timings[i];
493 struct detailed_non_pixel *data = &timing->data.other_data;
494 struct drm_display_mode *newmode;
496 /* EDID up to and including 1.2 may put monitor info here */
497 if (edid->version == 1 && edid->revision < 3)
500 /* Detailed mode timing */
501 if (timing->pixel_clock) {
502 newmode = drm_mode_detailed(dev, edid, timing, quirks);
506 /* First detailed mode is preferred */
507 if (i == 0 && edid->preferred_timing)
508 newmode->type |= DRM_MODE_TYPE_PREFERRED;
509 drm_mode_probed_add(connector, newmode);
515 /* Other timing or info */
516 switch (data->type) {
517 case EDID_DETAIL_MONITOR_SERIAL:
519 case EDID_DETAIL_MONITOR_STRING:
521 case EDID_DETAIL_MONITOR_RANGE:
522 /* Get monitor range data */
524 case EDID_DETAIL_MONITOR_NAME:
526 case EDID_DETAIL_MONITOR_CPDATA:
528 case EDID_DETAIL_STD_MODES:
529 /* Five modes per detailed section */
530 for (j = 0; j < 5; i++) {
531 struct std_timing *std;
532 struct drm_display_mode *newmode;
534 std = &data->data.timings[j];
535 newmode = drm_mode_std(dev, std);
537 drm_mode_probed_add(connector, newmode);
550 #define DDC_ADDR 0x50
552 * Get EDID information via I2C.
554 * \param adapter : i2c device adaptor
555 * \param buf : EDID data buffer to be filled
556 * \param len : EDID data buffer length
557 * \return 0 on success or -1 on failure.
559 * Try to fetch EDID information by calling i2c driver function.
561 int drm_do_probe_ddc_edid(struct i2c_adapter *adapter,
562 unsigned char *buf, int len)
564 unsigned char start = 0x0;
565 struct i2c_msg msgs[] = {
579 if (i2c_transfer(adapter, msgs, 2) == 2)
582 dev_info(&adapter->dev, "unable to read EDID block.\n");
585 EXPORT_SYMBOL(drm_do_probe_ddc_edid);
588 * Get EDID information.
590 * \param adapter : i2c device adaptor.
591 * \param buf : EDID data buffer to be filled
592 * \param len : EDID data buffer length
593 * \return 0 on success or -1 on failure.
595 * Initialize DDC, then fetch EDID information
596 * by calling drm_do_probe_ddc_edid function.
598 static int drm_ddc_read(struct i2c_adapter *adapter,
599 unsigned char *buf, int len)
601 struct i2c_algo_bit_data *algo_data = adapter->algo_data;
605 algo_data->setscl(algo_data->data, 1);
607 for (i = 0; i < 1; i++) {
608 /* For some old monitors we need the
609 * following process to initialize/stop DDC
611 algo_data->setsda(algo_data->data, 1);
614 algo_data->setscl(algo_data->data, 1);
615 for (j = 0; j < 5; j++) {
617 if (algo_data->getscl(algo_data->data))
623 algo_data->setsda(algo_data->data, 0);
625 algo_data->setscl(algo_data->data, 0);
627 algo_data->setsda(algo_data->data, 1);
630 /* Do the real work */
631 ret = drm_do_probe_ddc_edid(adapter, buf, len);
632 algo_data->setsda(algo_data->data, 0);
633 algo_data->setscl(algo_data->data, 0);
636 algo_data->setscl(algo_data->data, 1);
637 for (j = 0; j < 10; j++) {
639 if (algo_data->getscl(algo_data->data))
643 algo_data->setsda(algo_data->data, 1);
645 algo_data->setscl(algo_data->data, 0);
646 algo_data->setsda(algo_data->data, 0);
650 /* Release the DDC lines when done or the Apple Cinema HD display
653 algo_data->setsda(algo_data->data, 1);
654 algo_data->setscl(algo_data->data, 1);
659 static int drm_ddc_read_edid(struct drm_connector *connector,
660 struct i2c_adapter *adapter,
665 ret = drm_ddc_read(adapter, buf, len);
667 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n",
668 drm_get_connector_name(connector));
671 if (!edid_is_valid((struct edid *)buf)) {
672 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
673 drm_get_connector_name(connector));
680 #define MAX_EDID_EXT_NUM 4
682 * drm_get_edid - get EDID data, if available
683 * @connector: connector we're probing
684 * @adapter: i2c adapter to use for DDC
686 * Poke the given connector's i2c channel to grab EDID data if possible.
688 * Return edid data or NULL if we couldn't find any.
690 struct edid *drm_get_edid(struct drm_connector *connector,
691 struct i2c_adapter *adapter)
696 edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1),
699 dev_warn(&connector->dev->pdev->dev,
700 "Failed to allocate EDID\n");
704 /* Read first EDID block */
705 ret = drm_ddc_read_edid(connector, adapter,
706 (unsigned char *)edid, EDID_LENGTH);
710 /* There are EDID extensions to be read */
711 if (edid->extensions != 0) {
712 int edid_ext_num = edid->extensions;
714 if (edid_ext_num > MAX_EDID_EXT_NUM) {
715 dev_warn(&connector->dev->pdev->dev,
716 "The number of extension(%d) is "
717 "over max (%d), actually read number (%d)\n",
718 edid_ext_num, MAX_EDID_EXT_NUM,
720 /* Reset EDID extension number to be read */
721 edid_ext_num = MAX_EDID_EXT_NUM;
723 /* Read EDID including extensions too */
724 ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
725 EDID_LENGTH * (edid_ext_num + 1));
731 connector->display_info.raw_edid = (char *)edid;
741 EXPORT_SYMBOL(drm_get_edid);
743 #define HDMI_IDENTIFIER 0x000C03
744 #define VENDOR_BLOCK 0x03
746 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
747 * @edid: monitor EDID information
749 * Parse the CEA extension according to CEA-861-B.
750 * Return true if HDMI, false if not or unknown.
752 bool drm_detect_hdmi_monitor(struct edid *edid)
754 char *edid_ext = NULL;
755 int i, hdmi_id, edid_ext_num;
756 int start_offset, end_offset;
757 bool is_hdmi = false;
759 /* No EDID or EDID extensions */
760 if (edid == NULL || edid->extensions == 0)
763 /* Chose real EDID extension number */
764 edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?
765 MAX_EDID_EXT_NUM : edid->extensions;
767 /* Find CEA extension */
768 for (i = 0; i < edid_ext_num; i++) {
769 edid_ext = (char *)edid + EDID_LENGTH * (i + 1);
770 /* This block is CEA extension */
771 if (edid_ext[0] == 0x02)
775 if (i == edid_ext_num)
778 /* Data block offset in CEA extension block */
780 end_offset = edid_ext[2];
783 * Because HDMI identifier is in Vendor Specific Block,
784 * search it from all data blocks of CEA extension.
786 for (i = start_offset; i < end_offset;
787 /* Increased by data block len */
788 i += ((edid_ext[i] & 0x1f) + 1)) {
789 /* Find vendor specific block */
790 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
791 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
792 edid_ext[i + 3] << 16;
793 /* Find HDMI identifier */
794 if (hdmi_id == HDMI_IDENTIFIER)
803 EXPORT_SYMBOL(drm_detect_hdmi_monitor);
806 * drm_add_edid_modes - add modes from EDID data, if available
807 * @connector: connector we're probing
810 * Add the specified modes to the connector's mode list.
812 * Return number of modes added or 0 if we couldn't find any.
814 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
822 if (!edid_is_valid(edid)) {
823 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
824 drm_get_connector_name(connector));
828 quirks = edid_get_quirks(edid);
830 num_modes += add_established_modes(connector, edid);
831 num_modes += add_standard_modes(connector, edid);
832 num_modes += add_detailed_info(connector, edid, quirks);
834 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
835 edid_fixup_preferred(connector, quirks);
837 connector->display_info.serration_vsync = edid->serration_vsync;
838 connector->display_info.sync_on_green = edid->sync_on_green;
839 connector->display_info.composite_sync = edid->composite_sync;
840 connector->display_info.separate_syncs = edid->separate_syncs;
841 connector->display_info.blank_to_black = edid->blank_to_black;
842 connector->display_info.video_level = edid->video_level;
843 connector->display_info.digital = edid->digital;
844 connector->display_info.width_mm = edid->width_cm * 10;
845 connector->display_info.height_mm = edid->height_cm * 10;
846 connector->display_info.gamma = edid->gamma;
847 connector->display_info.gtf_supported = edid->default_gtf;
848 connector->display_info.standard_color = edid->standard_color;
849 connector->display_info.display_type = edid->display_type;
850 connector->display_info.active_off_supported = edid->pm_active_off;
851 connector->display_info.suspend_supported = edid->pm_suspend;
852 connector->display_info.standby_supported = edid->pm_standby;
853 connector->display_info.gamma = edid->gamma;
857 EXPORT_SYMBOL(drm_add_edid_modes);