drm: Parse HDR metadata info from EDID

HDR metadata block is introduced in CEA-861.3 spec.
Parsing the same to get the panel's HDR metadata.

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 106fd38..9f5f137 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3818,6 +3818,62 @@ 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) != DATA_BLOCK_EXTENDED_TAG)
+               return false;
+
+       if (db[1] != HDR_STATIC_METADATA_BLOCK)
+               return false;
+
+       return true;
+}
+
+static uint16_t eotf_supported(const u8 *edid_ext)
+{
+       uint16_t val = 0;
+
+       if (edid_ext[2] & TRADITIONAL_GAMMA_SDR)
+               val |= TRADITIONAL_GAMMA_SDR;
+       if (edid_ext[2] & TRADITIONAL_GAMMA_HDR)
+               val |= TRADITIONAL_GAMMA_HDR;
+       if (edid_ext[2] & SMPTE_ST2084)
+               val |= SMPTE_ST2084;
+
+       return val;
+}
+
+static uint16_t hdr_metadata_type(const u8 *edid_ext)
+{
+       uint16_t val = 0;
+
+       if (edid_ext[3] & STATIC_METADATA_TYPE1)
+               val |= STATIC_METADATA_TYPE1;
+
+       return val;
+}
+
+static void
+drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db)
+{
+       uint16_t len;
+
+       len = cea_db_payload_len(db);
+       connector->hdr_panel_metadata->eotf = eotf_supported(db);
+       connector->hdr_panel_metadata->type = hdr_metadata_type(db);
+
+       if (len == 6) {
+               connector->hdr_panel_metadata->max_cll = db[4];
+               connector->hdr_panel_metadata->max_fall = db[5];
+               connector->hdr_panel_metadata->min_cll = db[6];
+       } else if (len == 5) {
+               connector->hdr_panel_metadata->max_cll = db[4];
+               connector->hdr_panel_metadata->max_fall = db[5];
+       } else if (len == 4)
+               connector->hdr_panel_metadata->max_cll = db[4];
+
+}
+
 static void
 drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db)
 {
@@ -4468,6 +4524,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
                        drm_parse_hdmi_forum_vsdb(connector, db);
                if (cea_db_is_y420cmdb(db))
                        drm_parse_y420cmdb_bitmap(connector, db);
+               if (cea_db_is_hdmi_hdr_metadata_block(db))
+                       drm_parse_hdr_metadata_block(connector, db);
        }
 }