CEA 861.3 spec adds colorimetry data block for HDMI.
Parsing the block to get the colorimetry data from
panel.
v2: Rebase
v3: No Change
v4: Addressed Shashank's review comments. Updated
colorimetry field to 16 bit as DCI-P3 got added
in CEA 861-G spec, as pointed out by Shashank.
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 26 ++++++++++++++++++++++++++
include/drm/drm_connector.h | 3 +++
2 files changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fa1213e..c964c5c 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2834,6 +2834,7 @@ static int drm_cvt_modes(struct drm_connector *connector,
#define VIDEO_BLOCK 0x02
#define VENDOR_BLOCK 0x03
#define SPEAKER_BLOCK 0x04
+#define COLORIMETRY_DATA_BLOCK 0x5
#define HDR_STATIC_METADATA_BLOCK 0x6
#define USE_EXTENDED_TAG 0x07
#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
@@ -3809,6 +3810,29 @@ 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) != USE_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_ext(db);
+ /* As per CEA 861-G spec */
+ info->colorimetry = ((db[3] & (0x1 << 7)) << 1) | db[2];
+}
+
+
static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
{
if (cea_db_tag(db) != USE_EXTENDED_TAG)
@@ -4504,6 +4528,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
drm_parse_y420cmdb_bitmap(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 4ce74f3..a916195 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -206,6 +206,9 @@ struct drm_hdmi_info {
/** @y420_dc_modes: bitmap of deep color support index */
u8 y420_dc_modes;
+
+ /* @colorimetry: bitmap of supported colorimetry modes */
+ u16 colorimetry;
};
/**
--
1.9.1
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