Find HF-SCDB information in CEA extensions block. And retrieve Max_TMDS_Character_Rate that support by sink device.
Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Ankit Nautiyal ankit.k.nautiyal@intel.com Signed-off-by: Lee Shawn C shawn.c.lee@intel.com --- drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 2b8ddc956ce2..d6b48c543c23 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3350,6 +3350,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid, #define EXT_VIDEO_DATA_BLOCK_420 0x0E #define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F #define EXT_VIDEO_HF_EEODB_DATA_BLOCK 0x78 +#define EXT_VIDEO_HF_SCDB_DATA_BLOCK 0x79 #define EDID_BASIC_AUDIO (1 << 6) #define EDID_CEA_YCRCB444 (1 << 5) #define EDID_CEA_YCRCB422 (1 << 4) @@ -4277,6 +4278,20 @@ static bool cea_db_is_vcdb(const u8 *db) return true; }
+static bool cea_db_is_hf_scdb(const u8 *db) +{ + if (cea_db_tag(db) != USE_EXTENDED_TAG) + return false; + + if (cea_db_payload_len(db) < 7) + return false; + + if (cea_db_extended_tag(db) != EXT_VIDEO_HF_SCDB_DATA_BLOCK) + return false; + + return true; +} + static bool cea_db_is_y420cmdb(const u8 *db) { if (cea_db_tag(db) != USE_EXTENDED_TAG) @@ -4987,6 +5002,25 @@ static void drm_parse_vcdb(struct drm_connector *connector, const u8 *db) info->rgb_quant_range_selectable = true; }
+static void drm_parse_hf_scdb(struct drm_connector *connector, const u8 *db) +{ + struct drm_display_info *info = &connector->display_info; + u32 max_tmds_clock; + + DRM_DEBUG_KMS("HF-SCDB version 0x%02x\n", db[4]); + + max_tmds_clock = db[5] * 5000; + if (info->max_tmds_clock < max_tmds_clock) { + info->max_tmds_clock = max_tmds_clock; + DRM_DEBUG_KMS("HF-SCDB: max TMDS clock %d kHz\n", + info->max_tmds_clock); + } + + /* + * ToDo: Parse the remaining SCDB data if needed + */ +} + static void drm_get_max_frl_rate(int max_frl_rate, u8 *max_lanes, u8 *max_rate_per_lane) { @@ -5282,6 +5316,8 @@ 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_hf_scdb(db)) + drm_parse_hf_scdb(connector, db); if (cea_db_is_hdmi_hdr_metadata_block(db)) drm_parse_hdr_metadata_block(connector, db); }