Find HF-SCDB information in CEA extensions block. And retrieve Max_TMDS_Character_Rate that support by sink device.
v2: HF-SCDB and HF-VSDBS carry the same SCDS data. Reuse drm_parse_hdmi_forum_vsdb() to parse this packet.
Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Ville Syrjala ville.syrjala@linux.intel.com Cc: Ankit Nautiyal ankit.k.nautiyal@intel.com Cc: Drew Davenport ddavenport@chromium.org Cc: intel-gfx intel-gfx@lists.freedesktop.org Signed-off-by: Lee Shawn C shawn.c.lee@intel.com --- drivers/gpu/drm/drm_edid.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 5de85ba20bdf..351a729bddb6 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) @@ -4287,6 +4288,20 @@ static bool cea_db_is_vcdb(const u8 *db) return true; }
+static bool cea_db_is_hdmi_forum_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) @@ -5312,7 +5327,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
if (cea_db_is_hdmi_vsdb(db)) drm_parse_hdmi_vsdb_video(connector, db); - if (cea_db_is_hdmi_forum_vsdb(db)) + if (cea_db_is_hdmi_forum_vsdb(db) || + cea_db_is_hdmi_forum_scdb(db)) drm_parse_hdmi_forum_vsdb(connector, db); if (cea_db_is_microsoft_vsdb(db)) drm_parse_microsoft_vsdb(connector, db);