[Intel-gfx] [RFC 4/9] drm: Parse Colorimetry data block from EDID

[Uma Shankar]

CEA 861.3 spec adds colorimetry data block for HDMI.
Parsing the block to get the colorimetry data from
panel.

Signed-off-by: Uma Shankar <uma.shan...@intel.com>
---
 drivers/gpu/drm/drm_edid.c  |   24 ++++++++++++++++++++++++
 include/drm/drm_connector.h |    2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 14f2740..c9b9c3c 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3375,6 +3375,28 @@ static void fixup_detailed_cea_mode_clock(struct 
drm_display_mode *mode)
        mode->clock = clock;
 }
 
+static bool cea_db_is_hdmi_colorimetry_data_block(const u8 *db)
+{
+       if (cea_db_tag(db) != DATA_BLOCK_EXTENDED_TAG)
+               return false;
+
+       if (db[1] != COLORIMETRY_DATA_BLOCK)
+               return false;
+
+       return true;
+}
+
+static void
+drm_parse_colorimetry_data_block(struct drm_connector *connector, const u8 *db)
+{
+       struct drm_hdmi_info *info = &connector->display_info.hdmi;
+       uint16_t len;
+
+       len = cea_db_payload_len(db);
+       info->colorimetry = db[2];
+}
+
+
 static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
 {
        if (cea_db_tag(db) != DATA_BLOCK_EXTENDED_TAG)
@@ -4055,6 +4077,8 @@ static void drm_parse_cea_ext(struct drm_connector 
*connector,
                        drm_parse_hdmi_forum_vsdb(connector, db);
                if (cea_db_is_hdmi_hdr_metadata_block(db))
                        drm_parse_hdr_metadata_block(connector, db);
+               if (cea_db_is_hdmi_colorimetry_data_block(db))
+                       drm_parse_colorimetry_data_block(connector, db);
        }
 }
 
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index c99d737..c2b0798 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -137,6 +137,8 @@ struct drm_scdc {
 struct drm_hdmi_info {
        /** @scdc: sink's scdc support and capabilities */
        struct drm_scdc scdc;
+       /* Colorimerty info from EDID */
+       u32 colorimetry;
 };
 
 /**
-- 
1.7.9.5

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