[v3 04/14] drm: Parse Colorimetry data block from EDID

[Uma Shankar]

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

v2: Rebase

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/drm_edid.c  | 24 ++++++++++++++++++++++++
 include/drm/drm_connector.h |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index d12b74e..344d8c1 100644
--- 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)
@@ -4513,6 +4535,8 @@ 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 2ee45dc..90ce364 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -206,6 +206,8 @@ struct drm_hdmi_info {
 
 	/** @y420_dc_modes: bitmap of deep color support index */
 	u8 y420_dc_modes;
+
+	u8 colorimetry;
 };
 
 /**
-- 
1.9.1