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

v5: Addressed Shashank's comment and added his RB.

v6: Addressed Jonas Karlman review comments.

Signed-off-by: Uma Shankar <uma.shan...@intel.com>
Reviewed-by: Shashank Sharma <shashank.sha...@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 2c22ea4..1fc371b 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2830,6 +2830,7 @@ 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
@@ -3577,6 +3578,12 @@ 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];
@@ -3812,6 +3819,49 @@ 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_sink_metadata.hdmi_type1.eotf = eotf_supported(db);
+       connector->hdr_sink_metadata.hdmi_type1.metadata_type =
+                                       hdr_metadata_type(db);
+
+       if (len >= 4)
+               connector->hdr_sink_metadata.hdmi_type1.max_cll = db[4];
+       if (len >= 5)
+               connector->hdr_sink_metadata.hdmi_type1.max_fall = db[5];
+       if (len >= 6)
+               connector->hdr_sink_metadata.hdmi_type1.min_cll = db[6];
+}
+
 static void
 drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db)
 {
@@ -4439,6 +4489,8 @@ 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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