drm: Parse Colorimetry data block from EDID

EA 861.3 spec adds colorimetry data block for HDMI.
Parsing the block to get the colorimetry data from
panel.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 9f5f137..0804889 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3818,6 +3818,28 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
        mode->clock = clock;
 }
 
+static bool cea_db_is_hdmi_colorimetry_data_block(const u8 *db)
+{
+       if (cea_db_tag(db) != DATA_BLOCK_EXTENDED_TAG)
+               return false;
+
+       if (db[1] != COLORIMETRY_DATA_BLOCK)
+               return false;
+
+       return true;
+}
+
+static void
+drm_parse_colorimetry_data_block(struct drm_connector *connector, const u8 *db)
+{
+       struct drm_hdmi_info *info = &connector->display_info.hdmi;
+       uint16_t len;
+
+       len = cea_db_payload_len(db);
+       info->colorimetry = db[2];
+}
+
+
 static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
 {
        if (cea_db_tag(db) != DATA_BLOCK_EXTENDED_TAG)
@@ -4526,6 +4548,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
                        drm_parse_y420cmdb_bitmap(connector, db);
                if (cea_db_is_hdmi_hdr_metadata_block(db))
                        drm_parse_hdr_metadata_block(connector, db);
+               if (cea_db_is_hdmi_colorimetry_data_block(db))
+                       drm_parse_colorimetry_data_block(connector, db);
        }
 }
 

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 946fbcc..78b03c9 100644 (file)
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -158,6 +158,9 @@ struct drm_hdmi_info {
 
        /** @y420_dc_modes: bitmap of deep color support index */
        u8 y420_dc_modes;
+
+       /* Colorimerty info from EDID */
+       u32 colorimetry;
 };
 
 /**