diff options
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 384 |
1 files changed, 254 insertions, 130 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 69c68804023f..13bc4c290b17 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -29,16 +29,17 @@ */ #include <linux/bitfield.h> +#include <linux/byteorder/generic.h> #include <linux/cec.h> #include <linux/hdmi.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> +#include <linux/seq_buf.h> #include <linux/slab.h> #include <linux/vga_switcheroo.h> -#include <drm/drm_displayid.h> #include <drm/drm_drv.h> #include <drm/drm_edid.h> #include <drm/drm_eld.h> @@ -46,6 +47,7 @@ #include <drm/drm_print.h> #include "drm_crtc_internal.h" +#include "drm_displayid_internal.h" #include "drm_internal.h" static int oui(u8 first, u8 second, u8 third) @@ -102,6 +104,11 @@ struct detailed_mode_closure { int modes; }; +struct drm_edid_match_closure { + const struct drm_edid_ident *ident; + bool matched; +}; + #define LEVEL_DMT 0 #define LEVEL_GTF 1 #define LEVEL_GTF2 2 @@ -109,13 +116,15 @@ struct detailed_mode_closure { #define EDID_QUIRK(vend_chr_0, vend_chr_1, vend_chr_2, product_id, _quirks) \ { \ - .panel_id = drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, \ - product_id), \ + .ident = { \ + .panel_id = drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, \ + vend_chr_2, product_id), \ + }, \ .quirks = _quirks \ } static const struct edid_quirk { - u32 panel_id; + const struct drm_edid_ident ident; u32 quirks; } edid_quirk_list[] = { /* Acer AL1706 */ @@ -1808,39 +1817,28 @@ static int edid_block_tag(const void *_block) static bool edid_block_is_zero(const void *edid) { - return !memchr_inv(edid, 0, EDID_LENGTH); + return mem_is_zero(edid, EDID_LENGTH); } -/** - * drm_edid_are_equal - compare two edid blobs. - * @edid1: pointer to first blob - * @edid2: pointer to second blob - * This helper can be used during probing to determine if - * edid had changed. - */ -bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2) +static bool drm_edid_eq(const struct drm_edid *drm_edid, + const void *raw_edid, size_t raw_edid_size) { - int edid1_len, edid2_len; - bool edid1_present = edid1 != NULL; - bool edid2_present = edid2 != NULL; + bool edid1_present = drm_edid && drm_edid->edid && drm_edid->size; + bool edid2_present = raw_edid && raw_edid_size; if (edid1_present != edid2_present) return false; - if (edid1) { - edid1_len = edid_size(edid1); - edid2_len = edid_size(edid2); - - if (edid1_len != edid2_len) + if (edid1_present) { + if (drm_edid->size != raw_edid_size) return false; - if (memcmp(edid1, edid2, edid1_len)) + if (memcmp(drm_edid->edid, raw_edid, drm_edid->size)) return false; } return true; } -EXPORT_SYMBOL(drm_edid_are_equal); enum edid_block_status { EDID_BLOCK_OK = 0, @@ -1968,22 +1966,14 @@ static void edid_block_dump(const char *level, const void *block, int block_num) block, EDID_LENGTH, false); } -/** - * drm_edid_block_valid - Sanity check the EDID block (base or extension) - * @_block: pointer to raw EDID block - * @block_num: type of block to validate (0 for base, extension otherwise) - * @print_bad_edid: if true, dump bad EDID blocks to the console - * @edid_corrupt: if true, the header or checksum is invalid - * +/* * Validate a base or extension EDID block and optionally dump bad blocks to * the console. - * - * Return: True if the block is valid, false otherwise. */ -bool drm_edid_block_valid(u8 *_block, int block_num, bool print_bad_edid, - bool *edid_corrupt) +static bool drm_edid_block_valid(void *_block, int block_num, bool print_bad_edid, + bool *edid_corrupt) { - struct edid *block = (struct edid *)_block; + struct edid *block = _block; enum edid_block_status status; bool is_base_block = block_num == 0; bool valid; @@ -2026,7 +2016,6 @@ bool drm_edid_block_valid(u8 *_block, int block_num, bool print_bad_edid, return valid; } -EXPORT_SYMBOL(drm_edid_block_valid); /** * drm_edid_is_valid - sanity check EDID data @@ -2467,34 +2456,6 @@ fail: } /** - * drm_do_get_edid - get EDID data using a custom EDID block read function - * @connector: connector we're probing - * @read_block: EDID block read function - * @context: private data passed to the block read function - * - * When the I2C adapter connected to the DDC bus is hidden behind a device that - * exposes a different interface to read EDID blocks this function can be used - * to get EDID data using a custom block read function. - * - * As in the general case the DDC bus is accessible by the kernel at the I2C - * level, drivers must make all reasonable efforts to expose it as an I2C - * adapter and use drm_get_edid() instead of abusing this function. - * - * The EDID may be overridden using debugfs override_edid or firmware EDID - * (drm_edid_load_firmware() and drm.edid_firmware parameter), in this priority - * order. Having either of them bypasses actual EDID reads. - * - * Return: Pointer to valid EDID or NULL if we couldn't find any. - */ -struct edid *drm_do_get_edid(struct drm_connector *connector, - read_block_fn read_block, - void *context) -{ - return _drm_do_get_edid(connector, read_block, context, NULL); -} -EXPORT_SYMBOL_GPL(drm_do_get_edid); - -/** * drm_edid_raw - Get a pointer to the raw EDID data. * @drm_edid: drm_edid container * @@ -2749,8 +2710,84 @@ const struct drm_edid *drm_edid_read(struct drm_connector *connector) } EXPORT_SYMBOL(drm_edid_read); -static u32 edid_extract_panel_id(const struct edid *edid) +/** + * drm_edid_get_product_id - Get the vendor and product identification + * @drm_edid: EDID + * @id: Where to place the product id + */ +void drm_edid_get_product_id(const struct drm_edid *drm_edid, + struct drm_edid_product_id *id) +{ + if (drm_edid && drm_edid->edid && drm_edid->size >= EDID_LENGTH) + memcpy(id, &drm_edid->edid->product_id, sizeof(*id)); + else + memset(id, 0, sizeof(*id)); +} +EXPORT_SYMBOL(drm_edid_get_product_id); + +static void decode_date(struct seq_buf *s, const struct drm_edid_product_id *id) +{ + int week = id->week_of_manufacture; + int year = id->year_of_manufacture + 1990; + + if (week == 0xff) + seq_buf_printf(s, "model year: %d", year); + else if (!week) + seq_buf_printf(s, "year of manufacture: %d", year); + else + seq_buf_printf(s, "week/year of manufacture: %d/%d", week, year); +} + +/** + * drm_edid_print_product_id - Print decoded product id to printer + * @p: drm printer + * @id: EDID product id + * @raw: If true, also print the raw hex + * + * See VESA E-EDID 1.4 section 3.4. + */ +void drm_edid_print_product_id(struct drm_printer *p, + const struct drm_edid_product_id *id, bool raw) { + DECLARE_SEQ_BUF(date, 40); + char vend[4]; + + drm_edid_decode_mfg_id(be16_to_cpu(id->manufacturer_name), vend); + + decode_date(&date, id); + + drm_printf(p, "manufacturer name: %s, product code: %u, serial number: %u, %s\n", + vend, le16_to_cpu(id->product_code), + le32_to_cpu(id->serial_number), seq_buf_str(&date)); + + if (raw) + drm_printf(p, "raw product id: %*ph\n", (int)sizeof(*id), id); + + WARN_ON(seq_buf_has_overflowed(&date)); +} +EXPORT_SYMBOL(drm_edid_print_product_id); + +/** + * drm_edid_get_panel_id - Get a panel's ID from EDID + * @drm_edid: EDID that contains panel ID. + * + * This function uses the first block of the EDID of a panel and (assuming + * that the EDID is valid) extracts the ID out of it. The ID is a 32-bit value + * (16 bits of manufacturer ID and 16 bits of per-manufacturer ID) that's + * supposed to be different for each different modem of panel. + * + * Return: A 32-bit ID that should be different for each make/model of panel. + * See the functions drm_edid_encode_panel_id() and + * drm_edid_decode_panel_id() for some details on the structure of this + * ID. Return 0 if the EDID size is less than a base block. + */ +u32 drm_edid_get_panel_id(const struct drm_edid *drm_edid) +{ + const struct edid *edid = drm_edid->edid; + + if (drm_edid->size < EDID_LENGTH) + return 0; + /* * We represent the ID as a 32-bit number so it can easily be compared * with "==". @@ -2768,60 +2805,54 @@ static u32 edid_extract_panel_id(const struct edid *edid) (u32)edid->mfg_id[1] << 16 | (u32)EDID_PRODUCT_ID(edid); } +EXPORT_SYMBOL(drm_edid_get_panel_id); /** - * drm_edid_get_panel_id - Get a panel's ID through DDC + * drm_edid_read_base_block - Get a panel's EDID base block * @adapter: I2C adapter to use for DDC * - * This function reads the first block of the EDID of a panel and (assuming - * that the EDID is valid) extracts the ID out of it. The ID is a 32-bit value - * (16 bits of manufacturer ID and 16 bits of per-manufacturer ID) that's - * supposed to be different for each different modem of panel. + * This function returns the drm_edid containing the first block of the EDID of + * a panel. * * This function is intended to be used during early probing on devices where * more than one panel might be present. Because of its intended use it must - * assume that the EDID of the panel is correct, at least as far as the ID - * is concerned (in other words, we don't process any overrides here). + * assume that the EDID of the panel is correct, at least as far as the base + * block is concerned (in other words, we don't process any overrides here). + * + * Caller should call drm_edid_free() after use. * * NOTE: it's expected that this function and drm_do_get_edid() will both * be read the EDID, but there is no caching between them. Since we're only * reading the first block, hopefully this extra overhead won't be too big. * - * Return: A 32-bit ID that should be different for each make/model of panel. - * See the functions drm_edid_encode_panel_id() and - * drm_edid_decode_panel_id() for some details on the structure of this - * ID. + * WARNING: Only use this function when the connector is unknown. For example, + * during the early probe of panel. The EDID read from the function is temporary + * and should be replaced by the full EDID returned from other drm_edid_read. + * + * Return: Pointer to allocated EDID base block, or NULL on any failure. */ - -u32 drm_edid_get_panel_id(struct i2c_adapter *adapter) +const struct drm_edid *drm_edid_read_base_block(struct i2c_adapter *adapter) { enum edid_block_status status; void *base_block; - u32 panel_id = 0; - - /* - * There are no manufacturer IDs of 0, so if there is a problem reading - * the EDID then we'll just return 0. - */ base_block = kzalloc(EDID_LENGTH, GFP_KERNEL); if (!base_block) - return 0; + return NULL; status = edid_block_read(base_block, 0, drm_do_probe_ddc_edid, adapter); edid_block_status_print(status, base_block, 0); - if (edid_block_status_valid(status, edid_block_tag(base_block))) - panel_id = edid_extract_panel_id(base_block); - else + if (!edid_block_status_valid(status, edid_block_tag(base_block))) { edid_block_dump(KERN_NOTICE, base_block, 0); + kfree(base_block); + return NULL; + } - kfree(base_block); - - return panel_id; + return _drm_edid_alloc(base_block, EDID_LENGTH); } -EXPORT_SYMBOL(drm_edid_get_panel_id); +EXPORT_SYMBOL(drm_edid_read_base_block); /** * drm_get_edid_switcheroo - get EDID data for a vga_switcheroo output @@ -2903,16 +2934,17 @@ EXPORT_SYMBOL(drm_edid_duplicate); * @drm_edid: EDID to process * * This tells subsequent routines what fixes they need to apply. + * + * Return: A u32 represents the quirks to apply. */ static u32 edid_get_quirks(const struct drm_edid *drm_edid) { - u32 panel_id = edid_extract_panel_id(drm_edid->edid); const struct edid_quirk *quirk; int i; for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { quirk = &edid_quirk_list[i]; - if (quirk->panel_id == panel_id) + if (drm_edid_match(drm_edid, &quirk->ident)) return quirk->quirks; } @@ -3611,7 +3643,8 @@ static bool mode_in_range(const struct drm_display_mode *mode, if (!mode_in_vsync_range(mode, edid, t)) return false; - if ((max_clock = range_pixel_clock(edid, t))) + max_clock = range_pixel_clock(edid, t); + if (max_clock) if (mode->clock > max_clock) return false; @@ -4119,7 +4152,7 @@ static int add_detailed_modes(struct drm_connector *connector, * * FIXME: Prefer not returning pointers to raw EDID data. */ -const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid, +const u8 *drm_edid_find_extension(const struct drm_edid *drm_edid, int ext_id, int *ext_index) { const u8 *edid_ext = NULL; @@ -4149,11 +4182,21 @@ static bool drm_edid_has_cta_extension(const struct drm_edid *drm_edid) { const struct displayid_block *block; struct displayid_iter iter; - int ext_index = 0; + struct drm_edid_iter edid_iter; + const u8 *ext; bool found = false; /* Look for a top level CEA extension block */ - if (drm_find_edid_extension(drm_edid, CEA_EXT, &ext_index)) + drm_edid_iter_begin(drm_edid, &edid_iter); + drm_edid_iter_for_each(ext, &edid_iter) { + if (ext[0] == CEA_EXT) { + found = true; + break; + } + } + drm_edid_iter_end(&edid_iter); + + if (found) return true; /* CEA blocks can also be found embedded in a DisplayID block */ @@ -5442,6 +5485,66 @@ drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db) } static void +match_identity(const struct detailed_timing *timing, void *data) +{ + struct drm_edid_match_closure *closure = data; + unsigned int i; + const char *name = closure->ident->name; + unsigned int name_len = strlen(name); + const char *desc = timing->data.other_data.data.str.str; + unsigned int desc_len = ARRAY_SIZE(timing->data.other_data.data.str.str); + + if (name_len > desc_len || + !(is_display_descriptor(timing, EDID_DETAIL_MONITOR_NAME) || + is_display_descriptor(timing, EDID_DETAIL_MONITOR_STRING))) + return; + + if (strncmp(name, desc, name_len)) + return; + + for (i = name_len; i < desc_len; i++) { + if (desc[i] == '\n') + break; + /* Allow white space before EDID string terminator. */ + if (!isspace(desc[i])) + return; + } + + closure->matched = true; +} + +/** + * drm_edid_match - match drm_edid with given identity + * @drm_edid: EDID + * @ident: the EDID identity to match with + * + * Check if the EDID matches with the given identity. + * + * Return: True if the given identity matched with EDID, false otherwise. + */ +bool drm_edid_match(const struct drm_edid *drm_edid, + const struct drm_edid_ident *ident) +{ + if (!drm_edid || drm_edid_get_panel_id(drm_edid) != ident->panel_id) + return false; + + /* Match with name only if it's not NULL. */ + if (ident->name) { + struct drm_edid_match_closure closure = { + .ident = ident, + .matched = false, + }; + + drm_for_each_detailed_block(drm_edid, match_identity, &closure); + + return closure.matched; + } + + return true; +} +EXPORT_SYMBOL(drm_edid_match); + +static void monitor_name(const struct detailed_timing *timing, void *data) { const char **res = data; @@ -5502,7 +5605,9 @@ EXPORT_SYMBOL(drm_edid_get_monitor_name); static void clear_eld(struct drm_connector *connector) { + mutex_lock(&connector->eld_mutex); memset(connector->eld, 0, sizeof(connector->eld)); + mutex_unlock(&connector->eld_mutex); connector->latency_present[0] = false; connector->latency_present[1] = false; @@ -5554,6 +5659,8 @@ static void drm_edid_to_eld(struct drm_connector *connector, if (!drm_edid) return; + mutex_lock(&connector->eld_mutex); + mnl = get_monitor_name(drm_edid, &eld[DRM_ELD_MONITOR_NAME_STRING]); drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] ELD monitor %s\n", connector->base.id, connector->name, @@ -5614,6 +5721,8 @@ static void drm_edid_to_eld(struct drm_connector *connector, drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] ELD size %d, SAD count %d\n", connector->base.id, connector->name, drm_eld_size(eld), total_sad_count); + + mutex_unlock(&connector->eld_mutex); } static int _drm_edid_to_sad(const struct drm_edid *drm_edid, @@ -6517,6 +6626,11 @@ static void update_displayid_info(struct drm_connector *connector, displayid_iter_edid_begin(drm_edid, &iter); displayid_iter_for_each(block, &iter) { + drm_dbg_kms(connector->dev, + "[CONNECTOR:%d:%s] DisplayID extension version 0x%02x, primary use 0x%02x\n", + connector->base.id, connector->name, + displayid_version(&iter), + displayid_primary_use(&iter)); if (displayid_version(&iter) == DISPLAY_ID_STRUCTURE_VER_20 && (displayid_primary_use(&iter) == PRIMARY_USE_HEAD_MOUNTED_VR || displayid_primary_use(&iter) == PRIMARY_USE_HEAD_MOUNTED_AR)) @@ -6786,15 +6900,14 @@ static int _drm_edid_connector_property_update(struct drm_connector *connector, int ret; if (connector->edid_blob_ptr) { - const struct edid *old_edid = connector->edid_blob_ptr->data; - - if (old_edid) { - if (!drm_edid_are_equal(drm_edid ? drm_edid->edid : NULL, old_edid)) { - connector->epoch_counter++; - drm_dbg_kms(dev, "[CONNECTOR:%d:%s] EDID changed, epoch counter %llu\n", - connector->base.id, connector->name, - connector->epoch_counter); - } + const void *old_edid = connector->edid_blob_ptr->data; + size_t old_edid_size = connector->edid_blob_ptr->length; + + if (old_edid && !drm_edid_eq(drm_edid, old_edid, old_edid_size)) { + connector->epoch_counter++; + drm_dbg_kms(dev, "[CONNECTOR:%d:%s] EDID changed, epoch counter %llu\n", + connector->base.id, connector->name, + connector->epoch_counter); } } @@ -6830,6 +6943,39 @@ out: return ret; } +/* For sysfs edid show implementation */ +ssize_t drm_edid_connector_property_show(struct drm_connector *connector, + char *buf, loff_t off, size_t count) +{ + const void *edid; + size_t size; + ssize_t ret = 0; + + mutex_lock(&connector->dev->mode_config.mutex); + + if (!connector->edid_blob_ptr) + goto unlock; + + edid = connector->edid_blob_ptr->data; + size = connector->edid_blob_ptr->length; + if (!edid) + goto unlock; + + if (off >= size) + goto unlock; + + if (off + count > size) + count = size - off; + + memcpy(buf, edid + off, count); + + ret = count; +unlock: + mutex_unlock(&connector->dev->mode_config.mutex); + + return ret; +} + /** * drm_edid_connector_update - Update connector information from EDID * @connector: Connector @@ -6990,28 +7136,6 @@ int drm_add_modes_noedid(struct drm_connector *connector, } EXPORT_SYMBOL(drm_add_modes_noedid); -/** - * drm_set_preferred_mode - Sets the preferred mode of a connector - * @connector: connector whose mode list should be processed - * @hpref: horizontal resolution of preferred mode - * @vpref: vertical resolution of preferred mode - * - * Marks a mode as preferred if it matches the resolution specified by @hpref - * and @vpref. - */ -void drm_set_preferred_mode(struct drm_connector *connector, - int hpref, int vpref) -{ - struct drm_display_mode *mode; - - list_for_each_entry(mode, &connector->probed_modes, head) { - if (mode->hdisplay == hpref && - mode->vdisplay == vpref) - mode->type |= DRM_MODE_TYPE_PREFERRED; - } -} -EXPORT_SYMBOL(drm_set_preferred_mode); - static bool is_hdmi2_sink(const struct drm_connector *connector) { /* @@ -7345,7 +7469,7 @@ static void drm_parse_tiled_block(struct drm_connector *connector, static bool displayid_is_tiled_block(const struct displayid_iter *iter, const struct displayid_block *block) { - return (displayid_version(iter) == DISPLAY_ID_STRUCTURE_VER_12 && + return (displayid_version(iter) < DISPLAY_ID_STRUCTURE_VER_20 && block->tag == DATA_BLOCK_TILED_DISPLAY) || (displayid_version(iter) == DISPLAY_ID_STRUCTURE_VER_20 && block->tag == DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY); |