From e85959d6cbe08521942a6118568a38ac671e8d7f Mon Sep 17 00:00:00 2001 From: Uma Shankar Date: Thu, 16 May 2019 19:40:08 +0530 Subject: [PATCH] drm: Parse HDR metadata info from EDID MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit HDR metadata block is introduced in CEA-861.3 spec. Parsing the same to get the panel's HDR metadata. v2: Rebase and added Ville's POC changes to the patch. v3: No Change v4: Addressed Shashank's review comments v5: Addressed Shashank's comment and added his RB. v6: Addressed Jonas Karlman review comments. v7: Adressed Ville's review comments and fixed the issue with length handling. v8: Put the length check as per the convention followed in existing code, as suggested by Ville. Signed-off-by: Uma Shankar Reviewed-by: Shashank Sharma Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/1558015817-12025-4-git-send-email-uma.shankar@intel.com --- drivers/gpu/drm/drm_edid.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 852bdd8..a5ef9f4 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2852,6 +2852,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid, #define VIDEO_BLOCK 0x02 #define VENDOR_BLOCK 0x03 #define SPEAKER_BLOCK 0x04 +#define HDR_STATIC_METADATA_BLOCK 0x6 #define USE_EXTENDED_TAG 0x07 #define EXT_VIDEO_CAPABILITY_BLOCK 0x00 #define EXT_VIDEO_DATA_BLOCK_420 0x0E @@ -3834,6 +3835,54 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode) mode->clock = clock; } +static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db) +{ + if (cea_db_tag(db) != USE_EXTENDED_TAG) + return false; + + if (db[1] != HDR_STATIC_METADATA_BLOCK) + return false; + + if (cea_db_payload_len(db) < 3) + return false; + + return true; +} + +static uint8_t eotf_supported(const u8 *edid_ext) +{ + return edid_ext[2] & + (BIT(HDMI_EOTF_TRADITIONAL_GAMMA_SDR) | + BIT(HDMI_EOTF_TRADITIONAL_GAMMA_HDR) | + BIT(HDMI_EOTF_SMPTE_ST2084)); +} + +static uint8_t hdr_metadata_type(const u8 *edid_ext) +{ + return edid_ext[3] & + BIT(HDMI_STATIC_METADATA_TYPE1); +} + +static void +drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db) +{ + u16 len; + + len = cea_db_payload_len(db); + + connector->hdr_sink_metadata.hdmi_type1.eotf = + eotf_supported(db); + connector->hdr_sink_metadata.hdmi_type1.metadata_type = + hdr_metadata_type(db); + + if (len >= 4) + connector->hdr_sink_metadata.hdmi_type1.max_cll = db[4]; + if (len >= 5) + connector->hdr_sink_metadata.hdmi_type1.max_fall = db[5]; + if (len >= 6) + connector->hdr_sink_metadata.hdmi_type1.min_cll = db[6]; +} + static void drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db) { @@ -4461,6 +4510,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector, drm_parse_y420cmdb_bitmap(connector, db); if (cea_db_is_vcdb(db)) drm_parse_vcdb(connector, db); + if (cea_db_is_hdmi_hdr_metadata_block(db)) + drm_parse_hdr_metadata_block(connector, db); } } -- 2.7.4