Commit 115fcf58 authored by Lee Shawn C's avatar Lee Shawn C Committed by Jani Nikula
Browse files

drm/edid: check for HF-SCDB block 



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: intel-gfx <intel-gfx@lists.freedesktop.org>
Signed-off-by: default avatarLee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2bf7110cdb56d5dda311480787faf472c9802de4.1651569697.git.jani.nikula@intel.com
parent d10f7117

drivers/gpu/drm/drm_edid.c

+17 −1
Original line number Diff line number Diff line
@@ -3471,6 +3471,7 @@ add_detailed_modes(struct drm_connector *connector, const struct edid *edid, 
#define EXT_VIDEO_CAPABILITY_BLOCK 0x00

#define EXT_VIDEO_DATA_BLOCK_420	0x0E

#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F

#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)
@@ -4402,6 +4403,20 @@ 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)
@@ -5363,7 +5378,8 @@ 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);