| /* |
| * Copyright (c) 2006 Luc Verhaegen (quirks list) |
| * Copyright (c) 2007-2008 Intel Corporation |
| * Jesse Barnes <jesse.barnes@intel.com> |
| * |
| * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from |
| * FB layer. |
| * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sub license, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/i2c.h> |
| #include <linux/i2c-algo-bit.h> |
| #include "drmP.h" |
| #include "drm_edid.h" |
| |
| /* |
| * TODO: |
| * - support EDID 1.4 (incl. CE blocks) |
| */ |
| |
| /* |
| * EDID blocks out in the wild have a variety of bugs, try to collect |
| * them here (note that userspace may work around broken monitors first, |
| * but fixes should make their way here so that the kernel "just works" |
| * on as many displays as possible). |
| */ |
| |
| /* First detailed mode wrong, use largest 60Hz mode */ |
| #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) |
| /* Reported 135MHz pixel clock is too high, needs adjustment */ |
| #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) |
| /* Prefer the largest mode at 75 Hz */ |
| #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) |
| /* Detail timing is in cm not mm */ |
| #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) |
| /* Detailed timing descriptors have bogus size values, so just take the |
| * maximum size and use that. |
| */ |
| #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) |
| /* Monitor forgot to set the first detailed is preferred bit. */ |
| #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) |
| /* use +hsync +vsync for detailed mode */ |
| #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) |
| |
| static struct edid_quirk { |
| char *vendor; |
| int product_id; |
| u32 quirks; |
| } edid_quirk_list[] = { |
| /* Acer AL1706 */ |
| { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, |
| /* Acer F51 */ |
| { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, |
| /* Unknown Acer */ |
| { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, |
| |
| /* Belinea 10 15 55 */ |
| { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, |
| { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, |
| |
| /* Envision Peripherals, Inc. EN-7100e */ |
| { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, |
| |
| /* Funai Electronics PM36B */ |
| { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | |
| EDID_QUIRK_DETAILED_IN_CM }, |
| |
| /* LG Philips LCD LP154W01-A5 */ |
| { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, |
| { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, |
| |
| /* Philips 107p5 CRT */ |
| { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, |
| |
| /* Proview AY765C */ |
| { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, |
| |
| /* Samsung SyncMaster 205BW. Note: irony */ |
| { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, |
| /* Samsung SyncMaster 22[5-6]BW */ |
| { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, |
| { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, |
| }; |
| |
| |
| /* Valid EDID header has these bytes */ |
| static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 }; |
| |
| /** |
| * edid_is_valid - sanity check EDID data |
| * @edid: EDID data |
| * |
| * Sanity check the EDID block by looking at the header, the version number |
| * and the checksum. Return 0 if the EDID doesn't check out, or 1 if it's |
| * valid. |
| */ |
| static bool edid_is_valid(struct edid *edid) |
| { |
| int i; |
| u8 csum = 0; |
| u8 *raw_edid = (u8 *)edid; |
| |
| if (memcmp(edid->header, edid_header, sizeof(edid_header))) |
| goto bad; |
| if (edid->version != 1) { |
| DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); |
| goto bad; |
| } |
| if (edid->revision > 4) |
| DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); |
| |
| for (i = 0; i < EDID_LENGTH; i++) |
| csum += raw_edid[i]; |
| if (csum) { |
| DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); |
| goto bad; |
| } |
| |
| return 1; |
| |
| bad: |
| if (raw_edid) { |
| DRM_ERROR("Raw EDID:\n"); |
| print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH); |
| printk("\n"); |
| } |
| return 0; |
| } |
| |
| /** |
| * edid_vendor - match a string against EDID's obfuscated vendor field |
| * @edid: EDID to match |
| * @vendor: vendor string |
| * |
| * Returns true if @vendor is in @edid, false otherwise |
| */ |
| static bool edid_vendor(struct edid *edid, char *vendor) |
| { |
| char edid_vendor[3]; |
| |
| edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; |
| edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | |
| ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; |
| edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; |
| |
| return !strncmp(edid_vendor, vendor, 3); |
| } |
| |
| /** |
| * edid_get_quirks - return quirk flags for a given EDID |
| * @edid: EDID to process |
| * |
| * This tells subsequent routines what fixes they need to apply. |
| */ |
| static u32 edid_get_quirks(struct edid *edid) |
| { |
| struct edid_quirk *quirk; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { |
| quirk = &edid_quirk_list[i]; |
| |
| if (edid_vendor(edid, quirk->vendor) && |
| (EDID_PRODUCT_ID(edid) == quirk->product_id)) |
| return quirk->quirks; |
| } |
| |
| return 0; |
| } |
| |
| #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) |
| #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) |
| |
| |
| /** |
| * edid_fixup_preferred - set preferred modes based on quirk list |
| * @connector: has mode list to fix up |
| * @quirks: quirks list |
| * |
| * Walk the mode list for @connector, clearing the preferred status |
| * on existing modes and setting it anew for the right mode ala @quirks. |
| */ |
| static void edid_fixup_preferred(struct drm_connector *connector, |
| u32 quirks) |
| { |
| struct drm_display_mode *t, *cur_mode, *preferred_mode; |
| int target_refresh = 0; |
| |
| if (list_empty(&connector->probed_modes)) |
| return; |
| |
| if (quirks & EDID_QUIRK_PREFER_LARGE_60) |
| target_refresh = 60; |
| if (quirks & EDID_QUIRK_PREFER_LARGE_75) |
| target_refresh = 75; |
| |
| preferred_mode = list_first_entry(&connector->probed_modes, |
| struct drm_display_mode, head); |
| |
| list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { |
| cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; |
| |
| if (cur_mode == preferred_mode) |
| continue; |
| |
| /* Largest mode is preferred */ |
| if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) |
| preferred_mode = cur_mode; |
| |
| /* At a given size, try to get closest to target refresh */ |
| if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && |
| MODE_REFRESH_DIFF(cur_mode, target_refresh) < |
| MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { |
| preferred_mode = cur_mode; |
| } |
| } |
| |
| preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; |
| } |
| |
| /** |
| * drm_mode_std - convert standard mode info (width, height, refresh) into mode |
| * @t: standard timing params |
| * |
| * Take the standard timing params (in this case width, aspect, and refresh) |
| * and convert them into a real mode using CVT. |
| * |
| * Punts for now, but should eventually use the FB layer's CVT based mode |
| * generation code. |
| */ |
| struct drm_display_mode *drm_mode_std(struct drm_device *dev, |
| struct std_timing *t) |
| { |
| struct drm_display_mode *mode; |
| int hsize = t->hsize * 8 + 248, vsize; |
| |
| mode = drm_mode_create(dev); |
| if (!mode) |
| return NULL; |
| |
| if (t->aspect_ratio == 0) |
| vsize = (hsize * 10) / 16; |
| else if (t->aspect_ratio == 1) |
| vsize = (hsize * 3) / 4; |
| else if (t->aspect_ratio == 2) |
| vsize = (hsize * 4) / 5; |
| else |
| vsize = (hsize * 9) / 16; |
| |
| drm_mode_set_name(mode); |
| |
| return mode; |
| } |
| |
| /** |
| * drm_mode_detailed - create a new mode from an EDID detailed timing section |
| * @dev: DRM device (needed to create new mode) |
| * @edid: EDID block |
| * @timing: EDID detailed timing info |
| * @quirks: quirks to apply |
| * |
| * An EDID detailed timing block contains enough info for us to create and |
| * return a new struct drm_display_mode. |
| */ |
| static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, |
| struct edid *edid, |
| struct detailed_timing *timing, |
| u32 quirks) |
| { |
| struct drm_display_mode *mode; |
| struct detailed_pixel_timing *pt = &timing->data.pixel_data; |
| |
| /* ignore tiny modes */ |
| if (((pt->hactive_hi << 8) | pt->hactive_lo) < 64 || |
| ((pt->vactive_hi << 8) | pt->hactive_lo) < 64) |
| return NULL; |
| |
| if (pt->stereo) { |
| printk(KERN_WARNING "stereo mode not supported\n"); |
| return NULL; |
| } |
| if (!pt->separate_sync) { |
| printk(KERN_WARNING "integrated sync not supported\n"); |
| return NULL; |
| } |
| |
| mode = drm_mode_create(dev); |
| if (!mode) |
| return NULL; |
| |
| mode->type = DRM_MODE_TYPE_DRIVER; |
| |
| if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) |
| timing->pixel_clock = 1088; |
| |
| mode->clock = timing->pixel_clock * 10; |
| |
| mode->hdisplay = (pt->hactive_hi << 8) | pt->hactive_lo; |
| mode->hsync_start = mode->hdisplay + ((pt->hsync_offset_hi << 8) | |
| pt->hsync_offset_lo); |
| mode->hsync_end = mode->hsync_start + |
| ((pt->hsync_pulse_width_hi << 8) | |
| pt->hsync_pulse_width_lo); |
| mode->htotal = mode->hdisplay + ((pt->hblank_hi << 8) | pt->hblank_lo); |
| |
| mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo; |
| mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 4) | |
| pt->vsync_offset_lo); |
| mode->vsync_end = mode->vsync_start + |
| ((pt->vsync_pulse_width_hi << 4) | |
| pt->vsync_pulse_width_lo); |
| mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo); |
| |
| drm_mode_set_name(mode); |
| |
| if (pt->interlaced) |
| mode->flags |= DRM_MODE_FLAG_INTERLACE; |
| |
| if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { |
| pt->hsync_positive = 1; |
| pt->vsync_positive = 1; |
| } |
| |
| mode->flags |= pt->hsync_positive ? DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; |
| mode->flags |= pt->vsync_positive ? DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; |
| |
| mode->width_mm = pt->width_mm_lo | (pt->width_mm_hi << 8); |
| mode->height_mm = pt->height_mm_lo | (pt->height_mm_hi << 8); |
| |
| if (quirks & EDID_QUIRK_DETAILED_IN_CM) { |
| mode->width_mm *= 10; |
| mode->height_mm *= 10; |
| } |
| |
| if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { |
| mode->width_mm = edid->width_cm * 10; |
| mode->height_mm = edid->height_cm * 10; |
| } |
| |
| return mode; |
| } |
| |
| /* |
| * Detailed mode info for the EDID "established modes" data to use. |
| */ |
| static struct drm_display_mode edid_est_modes[] = { |
| { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840, |
| 968, 1056, 0, 600, 601, 605, 628, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */ |
| { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824, |
| 896, 1024, 0, 600, 601, 603, 625, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */ |
| { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656, |
| 720, 840, 0, 480, 481, 484, 500, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */ |
| { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664, |
| 704, 832, 0, 480, 489, 491, 520, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */ |
| { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704, |
| 768, 864, 0, 480, 483, 486, 525, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */ |
| { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656, |
| 752, 800, 0, 480, 490, 492, 525, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */ |
| { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738, |
| 846, 900, 0, 400, 421, 423, 449, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */ |
| { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738, |
| 846, 900, 0, 400, 412, 414, 449, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */ |
| { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296, |
| 1440, 1688, 0, 1024, 1025, 1028, 1066, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */ |
| { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040, |
| 1136, 1312, 0, 768, 769, 772, 800, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */ |
| { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048, |
| 1184, 1328, 0, 768, 771, 777, 806, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */ |
| { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048, |
| 1184, 1344, 0, 768, 771, 777, 806, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */ |
| { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032, |
| 1208, 1264, 0, 768, 768, 776, 817, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */ |
| { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864, |
| 928, 1152, 0, 624, 625, 628, 667, 0, |
| DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */ |
| { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816, |
| 896, 1056, 0, 600, 601, 604, 625, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */ |
| { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856, |
| 976, 1040, 0, 600, 637, 643, 666, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */ |
| { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216, |
| 1344, 1600, 0, 864, 865, 868, 900, 0, |
| DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */ |
| }; |
| |
| #define EDID_EST_TIMINGS 16 |
| #define EDID_STD_TIMINGS 8 |
| #define EDID_DETAILED_TIMINGS 4 |
| |
| /** |
| * add_established_modes - get est. modes from EDID and add them |
| * @edid: EDID block to scan |
| * |
| * Each EDID block contains a bitmap of the supported "established modes" list |
| * (defined above). Tease them out and add them to the global modes list. |
| */ |
| static int add_established_modes(struct drm_connector *connector, struct edid *edid) |
| { |
| struct drm_device *dev = connector->dev; |
| unsigned long est_bits = edid->established_timings.t1 | |
| (edid->established_timings.t2 << 8) | |
| ((edid->established_timings.mfg_rsvd & 0x80) << 9); |
| int i, modes = 0; |
| |
| for (i = 0; i <= EDID_EST_TIMINGS; i++) |
| if (est_bits & (1<<i)) { |
| struct drm_display_mode *newmode; |
| newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| modes++; |
| } |
| } |
| |
| return modes; |
| } |
| |
| /** |
| * add_standard_modes - get std. modes from EDID and add them |
| * @edid: EDID block to scan |
| * |
| * Standard modes can be calculated using the CVT standard. Grab them from |
| * @edid, calculate them, and add them to the list. |
| */ |
| static int add_standard_modes(struct drm_connector *connector, struct edid *edid) |
| { |
| struct drm_device *dev = connector->dev; |
| int i, modes = 0; |
| |
| for (i = 0; i < EDID_STD_TIMINGS; i++) { |
| struct std_timing *t = &edid->standard_timings[i]; |
| struct drm_display_mode *newmode; |
| |
| /* If std timings bytes are 1, 1 it's empty */ |
| if (t->hsize == 1 && (t->aspect_ratio | t->vfreq) == 1) |
| continue; |
| |
| newmode = drm_mode_std(dev, &edid->standard_timings[i]); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| modes++; |
| } |
| } |
| |
| return modes; |
| } |
| |
| /** |
| * add_detailed_modes - get detailed mode info from EDID data |
| * @connector: attached connector |
| * @edid: EDID block to scan |
| * @quirks: quirks to apply |
| * |
| * Some of the detailed timing sections may contain mode information. Grab |
| * it and add it to the list. |
| */ |
| static int add_detailed_info(struct drm_connector *connector, |
| struct edid *edid, u32 quirks) |
| { |
| struct drm_device *dev = connector->dev; |
| int i, j, modes = 0; |
| |
| for (i = 0; i < EDID_DETAILED_TIMINGS; i++) { |
| struct detailed_timing *timing = &edid->detailed_timings[i]; |
| struct detailed_non_pixel *data = &timing->data.other_data; |
| struct drm_display_mode *newmode; |
| |
| /* EDID up to and including 1.2 may put monitor info here */ |
| if (edid->version == 1 && edid->revision < 3) |
| continue; |
| |
| /* Detailed mode timing */ |
| if (timing->pixel_clock) { |
| newmode = drm_mode_detailed(dev, edid, timing, quirks); |
| if (!newmode) |
| continue; |
| |
| /* First detailed mode is preferred */ |
| if (i == 0 && edid->preferred_timing) |
| newmode->type |= DRM_MODE_TYPE_PREFERRED; |
| drm_mode_probed_add(connector, newmode); |
| |
| modes++; |
| continue; |
| } |
| |
| /* Other timing or info */ |
| switch (data->type) { |
| case EDID_DETAIL_MONITOR_SERIAL: |
| break; |
| case EDID_DETAIL_MONITOR_STRING: |
| break; |
| case EDID_DETAIL_MONITOR_RANGE: |
| /* Get monitor range data */ |
| break; |
| case EDID_DETAIL_MONITOR_NAME: |
| break; |
| case EDID_DETAIL_MONITOR_CPDATA: |
| break; |
| case EDID_DETAIL_STD_MODES: |
| /* Five modes per detailed section */ |
| for (j = 0; j < 5; i++) { |
| struct std_timing *std; |
| struct drm_display_mode *newmode; |
| |
| std = &data->data.timings[j]; |
| newmode = drm_mode_std(dev, std); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| modes++; |
| } |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| return modes; |
| } |
| |
| #define DDC_ADDR 0x50 |
| /** |
| * Get EDID information via I2C. |
| * |
| * \param adapter : i2c device adaptor |
| * \param buf : EDID data buffer to be filled |
| * \param len : EDID data buffer length |
| * \return 0 on success or -1 on failure. |
| * |
| * Try to fetch EDID information by calling i2c driver function. |
| */ |
| int drm_do_probe_ddc_edid(struct i2c_adapter *adapter, |
| unsigned char *buf, int len) |
| { |
| unsigned char start = 0x0; |
| struct i2c_msg msgs[] = { |
| { |
| .addr = DDC_ADDR, |
| .flags = 0, |
| .len = 1, |
| .buf = &start, |
| }, { |
| .addr = DDC_ADDR, |
| .flags = I2C_M_RD, |
| .len = len, |
| .buf = buf, |
| } |
| }; |
| |
| if (i2c_transfer(adapter, msgs, 2) == 2) |
| return 0; |
| |
| dev_info(&adapter->dev, "unable to read EDID block.\n"); |
| return -1; |
| } |
| EXPORT_SYMBOL(drm_do_probe_ddc_edid); |
| |
| static int drm_ddc_read_edid(struct drm_connector *connector, |
| struct i2c_adapter *adapter, |
| char *buf, int len) |
| { |
| int ret; |
| |
| ret = drm_do_probe_ddc_edid(adapter, buf, len); |
| if (ret != 0) { |
| dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", |
| drm_get_connector_name(connector)); |
| goto end; |
| } |
| if (!edid_is_valid((struct edid *)buf)) { |
| dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", |
| drm_get_connector_name(connector)); |
| ret = -1; |
| } |
| end: |
| return ret; |
| } |
| |
| #define MAX_EDID_EXT_NUM 4 |
| /** |
| * drm_get_edid - get EDID data, if available |
| * @connector: connector we're probing |
| * @adapter: i2c adapter to use for DDC |
| * |
| * Poke the given connector's i2c channel to grab EDID data if possible. |
| * |
| * Return edid data or NULL if we couldn't find any. |
| */ |
| struct edid *drm_get_edid(struct drm_connector *connector, |
| struct i2c_adapter *adapter) |
| { |
| int ret; |
| struct edid *edid; |
| |
| edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1), |
| GFP_KERNEL); |
| if (edid == NULL) { |
| dev_warn(&connector->dev->pdev->dev, |
| "Failed to allocate EDID\n"); |
| goto end; |
| } |
| |
| /* Read first EDID block */ |
| ret = drm_ddc_read_edid(connector, adapter, |
| (unsigned char *)edid, EDID_LENGTH); |
| if (ret != 0) |
| goto clean_up; |
| |
| /* There are EDID extensions to be read */ |
| if (edid->extensions != 0) { |
| int edid_ext_num = edid->extensions; |
| |
| if (edid_ext_num > MAX_EDID_EXT_NUM) { |
| dev_warn(&connector->dev->pdev->dev, |
| "The number of extension(%d) is " |
| "over max (%d), actually read number (%d)\n", |
| edid_ext_num, MAX_EDID_EXT_NUM, |
| MAX_EDID_EXT_NUM); |
| /* Reset EDID extension number to be read */ |
| edid_ext_num = MAX_EDID_EXT_NUM; |
| } |
| /* Read EDID including extensions too */ |
| ret = drm_ddc_read_edid(connector, adapter, (char *)edid, |
| EDID_LENGTH * (edid_ext_num + 1)); |
| if (ret != 0) |
| goto clean_up; |
| |
| } |
| |
| connector->display_info.raw_edid = (char *)edid; |
| goto end; |
| |
| clean_up: |
| kfree(edid); |
| edid = NULL; |
| end: |
| return edid; |
| |
| } |
| EXPORT_SYMBOL(drm_get_edid); |
| |
| #define HDMI_IDENTIFIER 0x000C03 |
| #define VENDOR_BLOCK 0x03 |
| /** |
| * drm_detect_hdmi_monitor - detect whether monitor is hdmi. |
| * @edid: monitor EDID information |
| * |
| * Parse the CEA extension according to CEA-861-B. |
| * Return true if HDMI, false if not or unknown. |
| */ |
| bool drm_detect_hdmi_monitor(struct edid *edid) |
| { |
| char *edid_ext = NULL; |
| int i, hdmi_id, edid_ext_num; |
| int start_offset, end_offset; |
| bool is_hdmi = false; |
| |
| /* No EDID or EDID extensions */ |
| if (edid == NULL || edid->extensions == 0) |
| goto end; |
| |
| /* Chose real EDID extension number */ |
| edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ? |
| MAX_EDID_EXT_NUM : edid->extensions; |
| |
| /* Find CEA extension */ |
| for (i = 0; i < edid_ext_num; i++) { |
| edid_ext = (char *)edid + EDID_LENGTH * (i + 1); |
| /* This block is CEA extension */ |
| if (edid_ext[0] == 0x02) |
| break; |
| } |
| |
| if (i == edid_ext_num) |
| goto end; |
| |
| /* Data block offset in CEA extension block */ |
| start_offset = 4; |
| end_offset = edid_ext[2]; |
| |
| /* |
| * Because HDMI identifier is in Vendor Specific Block, |
| * search it from all data blocks of CEA extension. |
| */ |
| for (i = start_offset; i < end_offset; |
| /* Increased by data block len */ |
| i += ((edid_ext[i] & 0x1f) + 1)) { |
| /* Find vendor specific block */ |
| if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { |
| hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | |
| edid_ext[i + 3] << 16; |
| /* Find HDMI identifier */ |
| if (hdmi_id == HDMI_IDENTIFIER) |
| is_hdmi = true; |
| break; |
| } |
| } |
| |
| end: |
| return is_hdmi; |
| } |
| EXPORT_SYMBOL(drm_detect_hdmi_monitor); |
| |
| /** |
| * drm_add_edid_modes - add modes from EDID data, if available |
| * @connector: connector we're probing |
| * @edid: edid data |
| * |
| * Add the specified modes to the connector's mode list. |
| * |
| * Return number of modes added or 0 if we couldn't find any. |
| */ |
| int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) |
| { |
| int num_modes = 0; |
| u32 quirks; |
| |
| if (edid == NULL) { |
| return 0; |
| } |
| if (!edid_is_valid(edid)) { |
| dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", |
| drm_get_connector_name(connector)); |
| return 0; |
| } |
| |
| quirks = edid_get_quirks(edid); |
| |
| num_modes += add_established_modes(connector, edid); |
| num_modes += add_standard_modes(connector, edid); |
| num_modes += add_detailed_info(connector, edid, quirks); |
| |
| if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) |
| edid_fixup_preferred(connector, quirks); |
| |
| connector->display_info.serration_vsync = edid->serration_vsync; |
| connector->display_info.sync_on_green = edid->sync_on_green; |
| connector->display_info.composite_sync = edid->composite_sync; |
| connector->display_info.separate_syncs = edid->separate_syncs; |
| connector->display_info.blank_to_black = edid->blank_to_black; |
| connector->display_info.video_level = edid->video_level; |
| connector->display_info.digital = edid->digital; |
| connector->display_info.width_mm = edid->width_cm * 10; |
| connector->display_info.height_mm = edid->height_cm * 10; |
| connector->display_info.gamma = edid->gamma; |
| connector->display_info.gtf_supported = edid->default_gtf; |
| connector->display_info.standard_color = edid->standard_color; |
| connector->display_info.display_type = edid->display_type; |
| connector->display_info.active_off_supported = edid->pm_active_off; |
| connector->display_info.suspend_supported = edid->pm_suspend; |
| connector->display_info.standby_supported = edid->pm_standby; |
| connector->display_info.gamma = edid->gamma; |
| |
| return num_modes; |
| } |
| EXPORT_SYMBOL(drm_add_edid_modes); |