HDR metadata block is introduced in CEA-861.3 spec.
Parsing the same to get the panel's HDR metadata.
v2: Rebase and added Ville's POC changes to the patch.
v3: No Change
v4: Addressed Shashank's review comments
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fa39592..fd8a621a 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2840,6 +2840,7 @@ static int drm_cvt_modes(struct drm_connector *connector,
#define VIDEO_BLOCK 0x02
#define VENDOR_BLOCK 0x03
#define SPEAKER_BLOCK 0x04
+#define HDR_STATIC_METADATA_BLOCK 0x6
#define USE_EXTENDED_TAG 0x07
#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
#define EXT_VIDEO_DATA_BLOCK_420 0x0E
@@ -3587,6 +3588,12 @@ static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
}
static int
+cea_db_payload_len_ext(const u8 *db)
+{
+ return (db[0] & 0x1f) - 1;
+}
+
+static int
cea_db_extended_tag(const u8 *db)
{
return db[1];
@@ -3822,6 +3829,46 @@ 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) != USE_EXTENDED_TAG)
+ return false;
+
+ if (db[1] != HDR_STATIC_METADATA_BLOCK)
+ return false;
+
+ return true;
+}
+
+static uint8_t eotf_supported(const u8 *edid_ext)
+{
+ return edid_ext[2] &
+ (BIT(HDMI_EOTF_TRADITIONAL_GAMMA_SDR) |
+ BIT(HDMI_EOTF_TRADITIONAL_GAMMA_HDR) |
+ BIT(HDMI_EOTF_SMPTE_ST2084));
+}
+
+static uint8_t hdr_metadata_type(const u8 *edid_ext)
+{
+ return edid_ext[3] &
+ BIT(HDMI_STATIC_METADATA_TYPE1);
+}
+
+static void
+drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db)
+{
+ u16 len;
+
+ len = cea_db_payload_len_ext(db);
+ connector->hdr_metadata.eotf = eotf_supported(db);
+ connector->hdr_metadata.metadata_type = hdr_metadata_type(db);
+
+ if (len >= 5)
+ connector->hdr_metadata.max_fall = db[5];
+ if (len >= 4)
+ connector->hdr_metadata.max_cll = db[4];
+}
+
static void
drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db)
{
@@ -4449,6 +4496,8 @@ 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_hdmi_hdr_metadata_block(db))
+ drm_parse_hdr_metadata_block(connector, db);
}
}
--
1.9.1
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