diff options
| author | Lee Shawn C <shawn.c.lee@intel.com> | 2022-05-03 12:23:47 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-05-05 20:16:35 +0300 |
| commit | 115fcf5899f7e0b0d3358a22a8cd76b1398642ee (patch) | |
| tree | 45723ae803c3ec06f30695adfe0a54928f7c8d0c /drivers/gpu/drm/drm_edid.c | |
| parent | d10f7117aa43b0b0d1c4b878afafb6d151da441d (diff) | |
| download | linux-115fcf5899f7e0b0d3358a22a8cd76b1398642ee.tar.xz | |
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: Lee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2bf7110cdb56d5dda311480787faf472c9802de4.1651569697.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 1dea0e2f0cab..fe527a0c50bc 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -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); |