/* * Copyright (c) 2006 Luc Verhaegen (quirks list) * Copyright (c) 2007-2008 Intel Corporation * Jesse Barnes * * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from * FB layer. * Copyright (C) 2006 Dennis Munsie * * 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 //#include //#include #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; unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) >> EDID_TIMING_ASPECT_SHIFT; mode = drm_mode_create(dev); if (!mode) return NULL; if (aspect_ratio == 0) vsize = (hsize * 10) / 16; else if (aspect_ratio == 1) vsize = (hsize * 3) / 4; else if (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; unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); /* ignore tiny modes */ if (hactive < 64 || vactive < 64) return NULL; if (pt->misc & DRM_EDID_PT_STEREO) { printk(KERN_WARNING "stereo mode not supported\n"); return NULL; } if (!(pt->misc & DRM_EDID_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 = cpu_to_le16(1088); mode->clock = le16_to_cpu(timing->pixel_clock) * 10; mode->hdisplay = hactive; mode->hsync_start = mode->hdisplay + hsync_offset; mode->hsync_end = mode->hsync_start + hsync_pulse_width; mode->htotal = mode->hdisplay + hblank; mode->vdisplay = vactive; mode->vsync_start = mode->vdisplay + vsync_offset; mode->vsync_end = mode->vsync_start + vsync_pulse_width; mode->vtotal = mode->vdisplay + vblank; drm_mode_set_name(mode); if (pt->misc & DRM_EDID_PT_INTERLACED) mode->flags |= DRM_MODE_FLAG_INTERLACE; if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; } mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 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<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->vfreq_aspect == 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->features & DRM_EDID_FEATURE_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->input & DRM_EDID_INPUT_SERRATION_VSYNC) ? 1 : 0; connector->display_info.sync_on_green = (edid->input & DRM_EDID_INPUT_SYNC_ON_GREEN) ? 1 : 0; connector->display_info.composite_sync = (edid->input & DRM_EDID_INPUT_COMPOSITE_SYNC) ? 1 : 0; connector->display_info.separate_syncs = (edid->input & DRM_EDID_INPUT_SEPARATE_SYNCS) ? 1 : 0; connector->display_info.blank_to_black = (edid->input & DRM_EDID_INPUT_BLANK_TO_BLACK) ? 1 : 0; connector->display_info.video_level = (edid->input & DRM_EDID_INPUT_VIDEO_LEVEL) >> 5; connector->display_info.digital = (edid->input & DRM_EDID_INPUT_DIGITAL) ? 1 : 0; 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->features & DRM_EDID_FEATURE_DEFAULT_GTF) ? 1 : 0; connector->display_info.standard_color = (edid->features & DRM_EDID_FEATURE_STANDARD_COLOR) ? 1 : 0; connector->display_info.display_type = (edid->features & DRM_EDID_FEATURE_DISPLAY_TYPE) >> 3; connector->display_info.active_off_supported = (edid->features & DRM_EDID_FEATURE_PM_ACTIVE_OFF) ? 1 : 0; connector->display_info.suspend_supported = (edid->features & DRM_EDID_FEATURE_PM_SUSPEND) ? 1 : 0; connector->display_info.standby_supported = (edid->features & DRM_EDID_FEATURE_PM_STANDBY) ? 1 : 0; connector->display_info.gamma = edid->gamma; return num_modes; } EXPORT_SYMBOL(drm_add_edid_modes);