| /* |
| * Copyright (c) 2006 Luc Verhaegen (quirks list) |
| * Copyright (c) 2007-2008 Intel Corporation |
| * Jesse Barnes <jesse.barnes@intel.com> |
| * Copyright 2010 Red Hat, Inc. |
| * |
| * 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/slab.h> |
| #include <linux/i2c.h> |
| #include "drmP.h" |
| #include "drm_edid.h" |
| #include "drm_edid_modes.h" |
| |
| #define version_greater(edid, maj, min) \ |
| (((edid)->version > (maj)) || \ |
| ((edid)->version == (maj) && (edid)->revision > (min))) |
| |
| #define EDID_EST_TIMINGS 16 |
| #define EDID_STD_TIMINGS 8 |
| #define EDID_DETAILED_TIMINGS 4 |
| |
| /* |
| * 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) |
| |
| struct detailed_mode_closure { |
| struct drm_connector *connector; |
| struct edid *edid; |
| bool preferred; |
| u32 quirks; |
| int modes; |
| }; |
| |
| #define LEVEL_DMT 0 |
| #define LEVEL_GTF 1 |
| #define LEVEL_GTF2 2 |
| #define LEVEL_CVT 3 |
| |
| 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 }, |
| /* Envision EN2028 */ |
| { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 }, |
| |
| /* 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 }, |
| }; |
| |
| /*** DDC fetch and block validation ***/ |
| |
| static const u8 edid_header[] = { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 |
| }; |
| |
| /* |
| * Sanity check the EDID block (base or extension). Return 0 if the block |
| * doesn't check out, or 1 if it's valid. |
| */ |
| static bool |
| drm_edid_block_valid(u8 *raw_edid) |
| { |
| int i; |
| u8 csum = 0; |
| struct edid *edid = (struct edid *)raw_edid; |
| |
| if (raw_edid[0] == 0x00) { |
| int score = 0; |
| |
| for (i = 0; i < sizeof(edid_header); i++) |
| if (raw_edid[i] == edid_header[i]) |
| score++; |
| |
| if (score == 8) ; |
| else if (score >= 6) { |
| DRM_DEBUG("Fixing EDID header, your hardware may be failing\n"); |
| memcpy(raw_edid, edid_header, sizeof(edid_header)); |
| } else { |
| goto bad; |
| } |
| } |
| |
| for (i = 0; i < EDID_LENGTH; i++) |
| csum += raw_edid[i]; |
| if (csum) { |
| DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); |
| |
| /* allow CEA to slide through, switches mangle this */ |
| if (raw_edid[0] != 0x02) |
| goto bad; |
| } |
| |
| /* per-block-type checks */ |
| switch (raw_edid[0]) { |
| case 0: /* base */ |
| 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"); |
| break; |
| |
| default: |
| break; |
| } |
| |
| return 1; |
| |
| bad: |
| if (raw_edid) { |
| printk(KERN_ERR "Raw EDID:\n"); |
| print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1, |
| raw_edid, EDID_LENGTH, false); |
| } |
| return 0; |
| } |
| |
| /** |
| * drm_edid_is_valid - sanity check EDID data |
| * @edid: EDID data |
| * |
| * Sanity-check an entire EDID record (including extensions) |
| */ |
| bool drm_edid_is_valid(struct edid *edid) |
| { |
| int i; |
| u8 *raw = (u8 *)edid; |
| |
| if (!edid) |
| return false; |
| |
| for (i = 0; i <= edid->extensions; i++) |
| if (!drm_edid_block_valid(raw + i * EDID_LENGTH)) |
| return false; |
| |
| return true; |
| } |
| EXPORT_SYMBOL(drm_edid_is_valid); |
| |
| #define DDC_ADDR 0x50 |
| #define DDC_SEGMENT_ADDR 0x30 |
| /** |
| * 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. |
| */ |
| static int |
| drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, |
| int block, int len) |
| { |
| unsigned char start = block * EDID_LENGTH; |
| int ret, retries = 5; |
| |
| /* The core i2c driver will automatically retry the transfer if the |
| * adapter reports EAGAIN. However, we find that bit-banging transfers |
| * are susceptible to errors under a heavily loaded machine and |
| * generate spurious NAKs and timeouts. Retrying the transfer |
| * of the individual block a few times seems to overcome this. |
| */ |
| do { |
| struct i2c_msg msgs[] = { |
| { |
| .addr = DDC_ADDR, |
| .flags = 0, |
| .len = 1, |
| .buf = &start, |
| }, { |
| .addr = DDC_ADDR, |
| .flags = I2C_M_RD, |
| .len = len, |
| .buf = buf, |
| } |
| }; |
| ret = i2c_transfer(adapter, msgs, 2); |
| } while (ret != 2 && --retries); |
| |
| return ret == 2 ? 0 : -1; |
| } |
| |
| static bool drm_edid_is_zero(u8 *in_edid, int length) |
| { |
| int i; |
| u32 *raw_edid = (u32 *)in_edid; |
| |
| for (i = 0; i < length / 4; i++) |
| if (*(raw_edid + i) != 0) |
| return false; |
| return true; |
| } |
| |
| static u8 * |
| drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) |
| { |
| int i, j = 0, valid_extensions = 0; |
| u8 *block, *new; |
| |
| if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) |
| return NULL; |
| |
| /* base block fetch */ |
| for (i = 0; i < 4; i++) { |
| if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH)) |
| goto out; |
| if (drm_edid_block_valid(block)) |
| break; |
| if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) { |
| connector->null_edid_counter++; |
| goto carp; |
| } |
| } |
| if (i == 4) |
| goto carp; |
| |
| /* if there's no extensions, we're done */ |
| if (block[0x7e] == 0) |
| return block; |
| |
| new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL); |
| if (!new) |
| goto out; |
| block = new; |
| |
| for (j = 1; j <= block[0x7e]; j++) { |
| for (i = 0; i < 4; i++) { |
| if (drm_do_probe_ddc_edid(adapter, |
| block + (valid_extensions + 1) * EDID_LENGTH, |
| j, EDID_LENGTH)) |
| goto out; |
| if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { |
| valid_extensions++; |
| break; |
| } |
| } |
| if (i == 4) |
| dev_warn(connector->dev->dev, |
| "%s: Ignoring invalid EDID block %d.\n", |
| drm_get_connector_name(connector), j); |
| } |
| |
| if (valid_extensions != block[0x7e]) { |
| block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; |
| block[0x7e] = valid_extensions; |
| new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); |
| if (!new) |
| goto out; |
| block = new; |
| } |
| |
| return block; |
| |
| carp: |
| dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n", |
| drm_get_connector_name(connector), j); |
| |
| out: |
| kfree(block); |
| return NULL; |
| } |
| |
| /** |
| * Probe DDC presence. |
| * |
| * \param adapter : i2c device adaptor |
| * \return 1 on success |
| */ |
| static bool |
| drm_probe_ddc(struct i2c_adapter *adapter) |
| { |
| unsigned char out; |
| |
| return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0); |
| } |
| |
| /** |
| * drm_get_edid - get EDID data, if available |
| * @connector: connector we're probing |
| * @adapter: i2c adapter to use for DDC |
| * |
| * Poke the given i2c channel to grab EDID data if possible. If found, |
| * attach it to the connector. |
| * |
| * Return edid data or NULL if we couldn't find any. |
| */ |
| struct edid *drm_get_edid(struct drm_connector *connector, |
| struct i2c_adapter *adapter) |
| { |
| struct edid *edid = NULL; |
| |
| if (drm_probe_ddc(adapter)) |
| edid = (struct edid *)drm_do_get_edid(connector, adapter); |
| |
| connector->display_info.raw_edid = (char *)edid; |
| |
| return edid; |
| |
| } |
| EXPORT_SYMBOL(drm_get_edid); |
| |
| /*** EDID parsing ***/ |
| |
| /** |
| * 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; |
| } |
| |
| struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev, |
| int hsize, int vsize, int fresh) |
| { |
| struct drm_display_mode *mode = NULL; |
| int i; |
| |
| for (i = 0; i < drm_num_dmt_modes; i++) { |
| const struct drm_display_mode *ptr = &drm_dmt_modes[i]; |
| if (hsize == ptr->hdisplay && |
| vsize == ptr->vdisplay && |
| fresh == drm_mode_vrefresh(ptr)) { |
| /* get the expected default mode */ |
| mode = drm_mode_duplicate(dev, ptr); |
| break; |
| } |
| } |
| return mode; |
| } |
| EXPORT_SYMBOL(drm_mode_find_dmt); |
| |
| typedef void detailed_cb(struct detailed_timing *timing, void *closure); |
| |
| static void |
| cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) |
| { |
| int i, n = 0; |
| u8 rev = ext[0x01], d = ext[0x02]; |
| u8 *det_base = ext + d; |
| |
| switch (rev) { |
| case 0: |
| /* can't happen */ |
| return; |
| case 1: |
| /* have to infer how many blocks we have, check pixel clock */ |
| for (i = 0; i < 6; i++) |
| if (det_base[18*i] || det_base[18*i+1]) |
| n++; |
| break; |
| default: |
| /* explicit count */ |
| n = min(ext[0x03] & 0x0f, 6); |
| break; |
| } |
| |
| for (i = 0; i < n; i++) |
| cb((struct detailed_timing *)(det_base + 18 * i), closure); |
| } |
| |
| static void |
| vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) |
| { |
| unsigned int i, n = min((int)ext[0x02], 6); |
| u8 *det_base = ext + 5; |
| |
| if (ext[0x01] != 1) |
| return; /* unknown version */ |
| |
| for (i = 0; i < n; i++) |
| cb((struct detailed_timing *)(det_base + 18 * i), closure); |
| } |
| |
| static void |
| drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) |
| { |
| int i; |
| struct edid *edid = (struct edid *)raw_edid; |
| |
| if (edid == NULL) |
| return; |
| |
| for (i = 0; i < EDID_DETAILED_TIMINGS; i++) |
| cb(&(edid->detailed_timings[i]), closure); |
| |
| for (i = 1; i <= raw_edid[0x7e]; i++) { |
| u8 *ext = raw_edid + (i * EDID_LENGTH); |
| switch (*ext) { |
| case CEA_EXT: |
| cea_for_each_detailed_block(ext, cb, closure); |
| break; |
| case VTB_EXT: |
| vtb_for_each_detailed_block(ext, cb, closure); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| static void |
| is_rb(struct detailed_timing *t, void *data) |
| { |
| u8 *r = (u8 *)t; |
| if (r[3] == EDID_DETAIL_MONITOR_RANGE) |
| if (r[15] & 0x10) |
| *(bool *)data = true; |
| } |
| |
| /* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */ |
| static bool |
| drm_monitor_supports_rb(struct edid *edid) |
| { |
| if (edid->revision >= 4) { |
| bool ret; |
| drm_for_each_detailed_block((u8 *)edid, is_rb, &ret); |
| return ret; |
| } |
| |
| return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0); |
| } |
| |
| static void |
| find_gtf2(struct detailed_timing *t, void *data) |
| { |
| u8 *r = (u8 *)t; |
| if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02) |
| *(u8 **)data = r; |
| } |
| |
| /* Secondary GTF curve kicks in above some break frequency */ |
| static int |
| drm_gtf2_hbreak(struct edid *edid) |
| { |
| u8 *r = NULL; |
| drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); |
| return r ? (r[12] * 2) : 0; |
| } |
| |
| static int |
| drm_gtf2_2c(struct edid *edid) |
| { |
| u8 *r = NULL; |
| drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); |
| return r ? r[13] : 0; |
| } |
| |
| static int |
| drm_gtf2_m(struct edid *edid) |
| { |
| u8 *r = NULL; |
| drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); |
| return r ? (r[15] << 8) + r[14] : 0; |
| } |
| |
| static int |
| drm_gtf2_k(struct edid *edid) |
| { |
| u8 *r = NULL; |
| drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); |
| return r ? r[16] : 0; |
| } |
| |
| static int |
| drm_gtf2_2j(struct edid *edid) |
| { |
| u8 *r = NULL; |
| drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r); |
| return r ? r[17] : 0; |
| } |
| |
| /** |
| * standard_timing_level - get std. timing level(CVT/GTF/DMT) |
| * @edid: EDID block to scan |
| */ |
| static int standard_timing_level(struct edid *edid) |
| { |
| if (edid->revision >= 2) { |
| if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) |
| return LEVEL_CVT; |
| if (drm_gtf2_hbreak(edid)) |
| return LEVEL_GTF2; |
| return LEVEL_GTF; |
| } |
| return LEVEL_DMT; |
| } |
| |
| /* |
| * 0 is reserved. The spec says 0x01 fill for unused timings. Some old |
| * monitors fill with ascii space (0x20) instead. |
| */ |
| static int |
| bad_std_timing(u8 a, u8 b) |
| { |
| return (a == 0x00 && b == 0x00) || |
| (a == 0x01 && b == 0x01) || |
| (a == 0x20 && b == 0x20); |
| } |
| |
| /** |
| * drm_mode_std - convert standard mode info (width, height, refresh) into mode |
| * @t: standard timing params |
| * @timing_level: standard timing level |
| * |
| * Take the standard timing params (in this case width, aspect, and refresh) |
| * and convert them into a real mode using CVT/GTF/DMT. |
| */ |
| static struct drm_display_mode * |
| drm_mode_std(struct drm_connector *connector, struct edid *edid, |
| struct std_timing *t, int revision) |
| { |
| struct drm_device *dev = connector->dev; |
| struct drm_display_mode *m, *mode = NULL; |
| int hsize, vsize; |
| int vrefresh_rate; |
| unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) |
| >> EDID_TIMING_ASPECT_SHIFT; |
| unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) |
| >> EDID_TIMING_VFREQ_SHIFT; |
| int timing_level = standard_timing_level(edid); |
| |
| if (bad_std_timing(t->hsize, t->vfreq_aspect)) |
| return NULL; |
| |
| /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ |
| hsize = t->hsize * 8 + 248; |
| /* vrefresh_rate = vfreq + 60 */ |
| vrefresh_rate = vfreq + 60; |
| /* the vdisplay is calculated based on the aspect ratio */ |
| if (aspect_ratio == 0) { |
| if (revision < 3) |
| vsize = hsize; |
| else |
| 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; |
| |
| /* HDTV hack, part 1 */ |
| if (vrefresh_rate == 60 && |
| ((hsize == 1360 && vsize == 765) || |
| (hsize == 1368 && vsize == 769))) { |
| hsize = 1366; |
| vsize = 768; |
| } |
| |
| /* |
| * If this connector already has a mode for this size and refresh |
| * rate (because it came from detailed or CVT info), use that |
| * instead. This way we don't have to guess at interlace or |
| * reduced blanking. |
| */ |
| list_for_each_entry(m, &connector->probed_modes, head) |
| if (m->hdisplay == hsize && m->vdisplay == vsize && |
| drm_mode_vrefresh(m) == vrefresh_rate) |
| return NULL; |
| |
| /* HDTV hack, part 2 */ |
| if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) { |
| mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0, |
| false); |
| mode->hdisplay = 1366; |
| mode->hsync_start = mode->hsync_start - 1; |
| mode->hsync_end = mode->hsync_end - 1; |
| return mode; |
| } |
| |
| /* check whether it can be found in default mode table */ |
| mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate); |
| if (mode) |
| return mode; |
| |
| switch (timing_level) { |
| case LEVEL_DMT: |
| break; |
| case LEVEL_GTF: |
| mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); |
| break; |
| case LEVEL_GTF2: |
| /* |
| * This is potentially wrong if there's ever a monitor with |
| * more than one ranges section, each claiming a different |
| * secondary GTF curve. Please don't do that. |
| */ |
| mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); |
| if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) { |
| kfree(mode); |
| mode = drm_gtf_mode_complex(dev, hsize, vsize, |
| vrefresh_rate, 0, 0, |
| drm_gtf2_m(edid), |
| drm_gtf2_2c(edid), |
| drm_gtf2_k(edid), |
| drm_gtf2_2j(edid)); |
| } |
| break; |
| case LEVEL_CVT: |
| mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0, |
| false); |
| break; |
| } |
| return mode; |
| } |
| |
| /* |
| * EDID is delightfully ambiguous about how interlaced modes are to be |
| * encoded. Our internal representation is of frame height, but some |
| * HDTV detailed timings are encoded as field height. |
| * |
| * The format list here is from CEA, in frame size. Technically we |
| * should be checking refresh rate too. Whatever. |
| */ |
| static void |
| drm_mode_do_interlace_quirk(struct drm_display_mode *mode, |
| struct detailed_pixel_timing *pt) |
| { |
| int i; |
| static const struct { |
| int w, h; |
| } cea_interlaced[] = { |
| { 1920, 1080 }, |
| { 720, 480 }, |
| { 1440, 480 }, |
| { 2880, 480 }, |
| { 720, 576 }, |
| { 1440, 576 }, |
| { 2880, 576 }, |
| }; |
| |
| if (!(pt->misc & DRM_EDID_PT_INTERLACED)) |
| return; |
| |
| for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) { |
| if ((mode->hdisplay == cea_interlaced[i].w) && |
| (mode->vdisplay == cea_interlaced[i].h / 2)) { |
| mode->vdisplay *= 2; |
| mode->vsync_start *= 2; |
| mode->vsync_end *= 2; |
| mode->vtotal *= 2; |
| mode->vtotal |= 1; |
| } |
| } |
| |
| mode->flags |= DRM_MODE_FLAG_INTERLACE; |
| } |
| |
| /** |
| * 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 "composite sync not supported\n"); |
| } |
| |
| /* it is incorrect if hsync/vsync width is zero */ |
| if (!hsync_pulse_width || !vsync_pulse_width) { |
| DRM_DEBUG_KMS("Incorrect Detailed timing. " |
| "Wrong Hsync/Vsync pulse width\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; |
| |
| /* Some EDIDs have bogus h/vtotal values */ |
| if (mode->hsync_end > mode->htotal) |
| mode->htotal = mode->hsync_end + 1; |
| if (mode->vsync_end > mode->vtotal) |
| mode->vtotal = mode->vsync_end + 1; |
| |
| drm_mode_do_interlace_quirk(mode, pt); |
| |
| drm_mode_set_name(mode); |
| |
| 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; |
| } |
| |
| static bool |
| mode_is_rb(const struct drm_display_mode *mode) |
| { |
| return (mode->htotal - mode->hdisplay == 160) && |
| (mode->hsync_end - mode->hdisplay == 80) && |
| (mode->hsync_end - mode->hsync_start == 32) && |
| (mode->vsync_start - mode->vdisplay == 3); |
| } |
| |
| static bool |
| mode_in_hsync_range(const struct drm_display_mode *mode, |
| struct edid *edid, u8 *t) |
| { |
| int hsync, hmin, hmax; |
| |
| hmin = t[7]; |
| if (edid->revision >= 4) |
| hmin += ((t[4] & 0x04) ? 255 : 0); |
| hmax = t[8]; |
| if (edid->revision >= 4) |
| hmax += ((t[4] & 0x08) ? 255 : 0); |
| hsync = drm_mode_hsync(mode); |
| |
| return (hsync <= hmax && hsync >= hmin); |
| } |
| |
| static bool |
| mode_in_vsync_range(const struct drm_display_mode *mode, |
| struct edid *edid, u8 *t) |
| { |
| int vsync, vmin, vmax; |
| |
| vmin = t[5]; |
| if (edid->revision >= 4) |
| vmin += ((t[4] & 0x01) ? 255 : 0); |
| vmax = t[6]; |
| if (edid->revision >= 4) |
| vmax += ((t[4] & 0x02) ? 255 : 0); |
| vsync = drm_mode_vrefresh(mode); |
| |
| return (vsync <= vmax && vsync >= vmin); |
| } |
| |
| static u32 |
| range_pixel_clock(struct edid *edid, u8 *t) |
| { |
| /* unspecified */ |
| if (t[9] == 0 || t[9] == 255) |
| return 0; |
| |
| /* 1.4 with CVT support gives us real precision, yay */ |
| if (edid->revision >= 4 && t[10] == 0x04) |
| return (t[9] * 10000) - ((t[12] >> 2) * 250); |
| |
| /* 1.3 is pathetic, so fuzz up a bit */ |
| return t[9] * 10000 + 5001; |
| } |
| |
| static bool |
| mode_in_range(const struct drm_display_mode *mode, struct edid *edid, |
| struct detailed_timing *timing) |
| { |
| u32 max_clock; |
| u8 *t = (u8 *)timing; |
| |
| if (!mode_in_hsync_range(mode, edid, t)) |
| return false; |
| |
| if (!mode_in_vsync_range(mode, edid, t)) |
| return false; |
| |
| if ((max_clock = range_pixel_clock(edid, t))) |
| if (mode->clock > max_clock) |
| return false; |
| |
| /* 1.4 max horizontal check */ |
| if (edid->revision >= 4 && t[10] == 0x04) |
| if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3)))) |
| return false; |
| |
| if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid)) |
| return false; |
| |
| return true; |
| } |
| |
| /* |
| * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will |
| * need to account for them. |
| */ |
| static int |
| drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, |
| struct detailed_timing *timing) |
| { |
| int i, modes = 0; |
| struct drm_display_mode *newmode; |
| struct drm_device *dev = connector->dev; |
| |
| for (i = 0; i < drm_num_dmt_modes; i++) { |
| if (mode_in_range(drm_dmt_modes + i, edid, timing)) { |
| newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| modes++; |
| } |
| } |
| } |
| |
| return modes; |
| } |
| |
| static void |
| do_inferred_modes(struct detailed_timing *timing, void *c) |
| { |
| struct detailed_mode_closure *closure = c; |
| struct detailed_non_pixel *data = &timing->data.other_data; |
| int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF); |
| |
| if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE) |
| closure->modes += drm_gtf_modes_for_range(closure->connector, |
| closure->edid, |
| timing); |
| } |
| |
| static int |
| add_inferred_modes(struct drm_connector *connector, struct edid *edid) |
| { |
| struct detailed_mode_closure closure = { |
| connector, edid, 0, 0, 0 |
| }; |
| |
| if (version_greater(edid, 1, 0)) |
| drm_for_each_detailed_block((u8 *)edid, do_inferred_modes, |
| &closure); |
| |
| return closure.modes; |
| } |
| |
| static int |
| drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing) |
| { |
| int i, j, m, modes = 0; |
| struct drm_display_mode *mode; |
| u8 *est = ((u8 *)timing) + 5; |
| |
| for (i = 0; i < 6; i++) { |
| for (j = 7; j > 0; j--) { |
| m = (i * 8) + (7 - j); |
| if (m >= ARRAY_SIZE(est3_modes)) |
| break; |
| if (est[i] & (1 << j)) { |
| mode = drm_mode_find_dmt(connector->dev, |
| est3_modes[m].w, |
| est3_modes[m].h, |
| est3_modes[m].r |
| /*, est3_modes[m].rb */); |
| if (mode) { |
| drm_mode_probed_add(connector, mode); |
| modes++; |
| } |
| } |
| } |
| } |
| |
| return modes; |
| } |
| |
| static void |
| do_established_modes(struct detailed_timing *timing, void *c) |
| { |
| struct detailed_mode_closure *closure = c; |
| struct detailed_non_pixel *data = &timing->data.other_data; |
| |
| if (data->type == EDID_DETAIL_EST_TIMINGS) |
| closure->modes += drm_est3_modes(closure->connector, timing); |
| } |
| |
| /** |
| * 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; |
| struct detailed_mode_closure closure = { |
| connector, edid, 0, 0, 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++; |
| } |
| } |
| } |
| |
| if (version_greater(edid, 1, 0)) |
| drm_for_each_detailed_block((u8 *)edid, |
| do_established_modes, &closure); |
| |
| return modes + closure.modes; |
| } |
| |
| static void |
| do_standard_modes(struct detailed_timing *timing, void *c) |
| { |
| struct detailed_mode_closure *closure = c; |
| struct detailed_non_pixel *data = &timing->data.other_data; |
| struct drm_connector *connector = closure->connector; |
| struct edid *edid = closure->edid; |
| |
| if (data->type == EDID_DETAIL_STD_MODES) { |
| int i; |
| for (i = 0; i < 6; i++) { |
| struct std_timing *std; |
| struct drm_display_mode *newmode; |
| |
| std = &data->data.timings[i]; |
| newmode = drm_mode_std(connector, edid, std, |
| edid->revision); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| closure->modes++; |
| } |
| } |
| } |
| } |
| |
| /** |
| * add_standard_modes - get std. modes from EDID and add them |
| * @edid: EDID block to scan |
| * |
| * Standard modes can be calculated using the appropriate standard (DMT, |
| * GTF or CVT. Grab them from @edid and add them to the list. |
| */ |
| static int |
| add_standard_modes(struct drm_connector *connector, struct edid *edid) |
| { |
| int i, modes = 0; |
| struct detailed_mode_closure closure = { |
| connector, edid, 0, 0, 0 |
| }; |
| |
| for (i = 0; i < EDID_STD_TIMINGS; i++) { |
| struct drm_display_mode *newmode; |
| |
| newmode = drm_mode_std(connector, edid, |
| &edid->standard_timings[i], |
| edid->revision); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| modes++; |
| } |
| } |
| |
| if (version_greater(edid, 1, 0)) |
| drm_for_each_detailed_block((u8 *)edid, do_standard_modes, |
| &closure); |
| |
| /* XXX should also look for standard codes in VTB blocks */ |
| |
| return modes + closure.modes; |
| } |
| |
| static int drm_cvt_modes(struct drm_connector *connector, |
| struct detailed_timing *timing) |
| { |
| int i, j, modes = 0; |
| struct drm_display_mode *newmode; |
| struct drm_device *dev = connector->dev; |
| struct cvt_timing *cvt; |
| const int rates[] = { 60, 85, 75, 60, 50 }; |
| const u8 empty[3] = { 0, 0, 0 }; |
| |
| for (i = 0; i < 4; i++) { |
| int uninitialized_var(width), height; |
| cvt = &(timing->data.other_data.data.cvt[i]); |
| |
| if (!memcmp(cvt->code, empty, 3)) |
| continue; |
| |
| height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2; |
| switch (cvt->code[1] & 0x0c) { |
| case 0x00: |
| width = height * 4 / 3; |
| break; |
| case 0x04: |
| width = height * 16 / 9; |
| break; |
| case 0x08: |
| width = height * 16 / 10; |
| break; |
| case 0x0c: |
| width = height * 15 / 9; |
| break; |
| } |
| |
| for (j = 1; j < 5; j++) { |
| if (cvt->code[2] & (1 << j)) { |
| newmode = drm_cvt_mode(dev, width, height, |
| rates[j], j == 0, |
| false, false); |
| if (newmode) { |
| drm_mode_probed_add(connector, newmode); |
| modes++; |
| } |
| } |
| } |
| } |
| |
| return modes; |
| } |
| |
| static void |
| do_cvt_mode(struct detailed_timing *timing, void *c) |
| { |
| struct detailed_mode_closure *closure = c; |
| struct detailed_non_pixel *data = &timing->data.other_data; |
| |
| if (data->type == EDID_DETAIL_CVT_3BYTE) |
| closure->modes += drm_cvt_modes(closure->connector, timing); |
| } |
| |
| static int |
| add_cvt_modes(struct drm_connector *connector, struct edid *edid) |
| { |
| struct detailed_mode_closure closure = { |
| connector, edid, 0, 0, 0 |
| }; |
| |
| if (version_greater(edid, 1, 2)) |
| drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure); |
| |
| /* XXX should also look for CVT codes in VTB blocks */ |
| |
| return closure.modes; |
| } |
| |
| static void |
| do_detailed_mode(struct detailed_timing *timing, void *c) |
| { |
| struct detailed_mode_closure *closure = c; |
| struct drm_display_mode *newmode; |
| |
| if (timing->pixel_clock) { |
| newmode = drm_mode_detailed(closure->connector->dev, |
| closure->edid, timing, |
| closure->quirks); |
| if (!newmode) |
| return; |
| |
| if (closure->preferred) |
| newmode->type |= DRM_MODE_TYPE_PREFERRED; |
| |
| drm_mode_probed_add(closure->connector, newmode); |
| closure->modes++; |
| closure->preferred = 0; |
| } |
| } |
| |
| /* |
| * add_detailed_modes - Add modes from detailed timings |
| * @connector: attached connector |
| * @edid: EDID block to scan |
| * @quirks: quirks to apply |
| */ |
| static int |
| add_detailed_modes(struct drm_connector *connector, struct edid *edid, |
| u32 quirks) |
| { |
| struct detailed_mode_closure closure = { |
| connector, |
| edid, |
| 1, |
| quirks, |
| 0 |
| }; |
| |
| if (closure.preferred && !version_greater(edid, 1, 3)) |
| closure.preferred = |
| (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING); |
| |
| drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure); |
| |
| return closure.modes; |
| } |
| |
| #define HDMI_IDENTIFIER 0x000C03 |
| #define AUDIO_BLOCK 0x01 |
| #define VENDOR_BLOCK 0x03 |
| #define EDID_BASIC_AUDIO (1 << 6) |
| |
| /** |
| * Search EDID for CEA extension block. |
| */ |
| u8 *drm_find_cea_extension(struct edid *edid) |
| { |
| u8 *edid_ext = NULL; |
| int i; |
| |
| /* No EDID or EDID extensions */ |
| if (edid == NULL || edid->extensions == 0) |
| return NULL; |
| |
| /* Find CEA extension */ |
| for (i = 0; i < edid->extensions; i++) { |
| edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1); |
| if (edid_ext[0] == CEA_EXT) |
| break; |
| } |
| |
| if (i == edid->extensions) |
| return NULL; |
| |
| return edid_ext; |
| } |
| EXPORT_SYMBOL(drm_find_cea_extension); |
| |
| /** |
| * 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) |
| { |
| u8 *edid_ext; |
| int i, hdmi_id; |
| int start_offset, end_offset; |
| bool is_hdmi = false; |
| |
| edid_ext = drm_find_cea_extension(edid); |
| if (!edid_ext) |
| 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_detect_monitor_audio - check monitor audio capability |
| * |
| * Monitor should have CEA extension block. |
| * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic |
| * audio' only. If there is any audio extension block and supported |
| * audio format, assume at least 'basic audio' support, even if 'basic |
| * audio' is not defined in EDID. |
| * |
| */ |
| bool drm_detect_monitor_audio(struct edid *edid) |
| { |
| u8 *edid_ext; |
| int i, j; |
| bool has_audio = false; |
| int start_offset, end_offset; |
| |
| edid_ext = drm_find_cea_extension(edid); |
| if (!edid_ext) |
| goto end; |
| |
| has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0); |
| |
| if (has_audio) { |
| DRM_DEBUG_KMS("Monitor has basic audio support\n"); |
| goto end; |
| } |
| |
| /* Data block offset in CEA extension block */ |
| start_offset = 4; |
| end_offset = edid_ext[2]; |
| |
| for (i = start_offset; i < end_offset; |
| i += ((edid_ext[i] & 0x1f) + 1)) { |
| if ((edid_ext[i] >> 5) == AUDIO_BLOCK) { |
| has_audio = true; |
| for (j = 1; j < (edid_ext[i] & 0x1f); j += 3) |
| DRM_DEBUG_KMS("CEA audio format %d\n", |
| (edid_ext[i + j] >> 3) & 0xf); |
| goto end; |
| } |
| } |
| end: |
| return has_audio; |
| } |
| EXPORT_SYMBOL(drm_detect_monitor_audio); |
| |
| /** |
| * drm_add_display_info - pull display info out if present |
| * @edid: EDID data |
| * @info: display info (attached to connector) |
| * |
| * Grab any available display info and stuff it into the drm_display_info |
| * structure that's part of the connector. Useful for tracking bpp and |
| * color spaces. |
| */ |
| static void drm_add_display_info(struct edid *edid, |
| struct drm_display_info *info) |
| { |
| u8 *edid_ext; |
| |
| info->width_mm = edid->width_cm * 10; |
| info->height_mm = edid->height_cm * 10; |
| |
| /* driver figures it out in this case */ |
| info->bpc = 0; |
| info->color_formats = 0; |
| |
| /* Only defined for 1.4 with digital displays */ |
| if (edid->revision < 4) |
| return; |
| |
| if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) |
| return; |
| |
| switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) { |
| case DRM_EDID_DIGITAL_DEPTH_6: |
| info->bpc = 6; |
| break; |
| case DRM_EDID_DIGITAL_DEPTH_8: |
| info->bpc = 8; |
| break; |
| case DRM_EDID_DIGITAL_DEPTH_10: |
| info->bpc = 10; |
| break; |
| case DRM_EDID_DIGITAL_DEPTH_12: |
| info->bpc = 12; |
| break; |
| case DRM_EDID_DIGITAL_DEPTH_14: |
| info->bpc = 14; |
| break; |
| case DRM_EDID_DIGITAL_DEPTH_16: |
| info->bpc = 16; |
| break; |
| case DRM_EDID_DIGITAL_DEPTH_UNDEF: |
| default: |
| info->bpc = 0; |
| break; |
| } |
| |
| info->color_formats = DRM_COLOR_FORMAT_RGB444; |
| if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444) |
| info->color_formats = DRM_COLOR_FORMAT_YCRCB444; |
| if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422) |
| info->color_formats = DRM_COLOR_FORMAT_YCRCB422; |
| |
| /* Get data from CEA blocks if present */ |
| edid_ext = drm_find_cea_extension(edid); |
| if (!edid_ext) |
| return; |
| |
| info->cea_rev = edid_ext[1]; |
| } |
| |
| /** |
| * 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 (!drm_edid_is_valid(edid)) { |
| dev_warn(connector->dev->dev, "%s: EDID invalid.\n", |
| drm_get_connector_name(connector)); |
| return 0; |
| } |
| |
| quirks = edid_get_quirks(edid); |
| |
| /* |
| * EDID spec says modes should be preferred in this order: |
| * - preferred detailed mode |
| * - other detailed modes from base block |
| * - detailed modes from extension blocks |
| * - CVT 3-byte code modes |
| * - standard timing codes |
| * - established timing codes |
| * - modes inferred from GTF or CVT range information |
| * |
| * We get this pretty much right. |
| * |
| * XXX order for additional mode types in extension blocks? |
| */ |
| num_modes += add_detailed_modes(connector, edid, quirks); |
| num_modes += add_cvt_modes(connector, edid); |
| num_modes += add_standard_modes(connector, edid); |
| num_modes += add_established_modes(connector, edid); |
| num_modes += add_inferred_modes(connector, edid); |
| |
| if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) |
| edid_fixup_preferred(connector, quirks); |
| |
| drm_add_display_info(edid, &connector->display_info); |
| |
| return num_modes; |
| } |
| EXPORT_SYMBOL(drm_add_edid_modes); |
| |
| /** |
| * drm_add_modes_noedid - add modes for the connectors without EDID |
| * @connector: connector we're probing |
| * @hdisplay: the horizontal display limit |
| * @vdisplay: the vertical display limit |
| * |
| * Add the specified modes to the connector's mode list. Only when the |
| * hdisplay/vdisplay is not beyond the given limit, it will be added. |
| * |
| * Return number of modes added or 0 if we couldn't find any. |
| */ |
| int drm_add_modes_noedid(struct drm_connector *connector, |
| int hdisplay, int vdisplay) |
| { |
| int i, count, num_modes = 0; |
| struct drm_display_mode *mode; |
| struct drm_device *dev = connector->dev; |
| |
| count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode); |
| if (hdisplay < 0) |
| hdisplay = 0; |
| if (vdisplay < 0) |
| vdisplay = 0; |
| |
| for (i = 0; i < count; i++) { |
| const struct drm_display_mode *ptr = &drm_dmt_modes[i]; |
| if (hdisplay && vdisplay) { |
| /* |
| * Only when two are valid, they will be used to check |
| * whether the mode should be added to the mode list of |
| * the connector. |
| */ |
| if (ptr->hdisplay > hdisplay || |
| ptr->vdisplay > vdisplay) |
| continue; |
| } |
| if (drm_mode_vrefresh(ptr) > 61) |
| continue; |
| mode = drm_mode_duplicate(dev, ptr); |
| if (mode) { |
| drm_mode_probed_add(connector, mode); |
| num_modes++; |
| } |
| } |
| return num_modes; |
| } |
| EXPORT_SYMBOL(drm_add_modes_noedid); |