[RFC 1/9] drm: Add HDR source metadata property

[Uma Shankar]

This patch adds a blob property to get HDR metadata
information from userspace. This will be send as part
of AVI Infoframe to panel.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/drm_connector.c |    7 +++++++
 include/drm/drm_connector.h     |   11 +++++++++++
 include/drm/drm_mode_config.h   |    6 ++++++
 include/uapi/drm/drm_mode.h     |   22 ++++++++++++++++++++++
 4 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 5cd61af..1b36fa2 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -789,6 +789,13 @@ int drm_connector_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.link_status_property = prop;
 
+	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
+				   "HDR_SOURCE_METADATA", 0);
+
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.hdr_source_metadata_property = prop;
+
 	return 0;
 }
 
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index d8bb25f..c99d737 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -342,6 +342,13 @@ struct drm_connector_state {
 	 * upscaling, mostly used for built-in panels.
 	 */
 	unsigned int scaling_mode;
+
+	/**
+	 * @metadata_blob_ptr:
+	 * DRM blob property for HDR metadata
+	 */
+	struct drm_property_blob *hdr_source_metadata_blob_ptr;
+	bool hdr_metadata_changed : 1;
 };
 
 /**
@@ -877,6 +884,10 @@ struct drm_connector {
 	uint8_t num_h_tile, num_v_tile;
 	uint8_t tile_h_loc, tile_v_loc;
 	uint16_t tile_h_size, tile_v_size;
+
+	/* HDR metdata */
+	struct hdr_static_metadata *hdr_panel_metadata;
+	struct hdr_static_metadata *hdr_source_metadata;
 };
 
 #define obj_to_connector(x) container_of(x, struct drm_connector, base)
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 4298171..9ca49ea 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -741,6 +741,12 @@ struct drm_mode_config {
 	 */
 	struct drm_property *suggested_y_property;
 
+	/**
+	 * hdr_metadata_property: Connector property containing hdr metatda
+	 * This will be provided by userspace compositors based on HDR content
+	 */
+	struct drm_property *hdr_source_metadata_property;
+
 	/* dumb ioctl parameters */
 	uint32_t preferred_depth, prefer_shadow;
 
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 403339f..920ea2a 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -590,6 +590,28 @@ struct drm_color_lut {
 	__u16 reserved;
 };
 
+enum supported_eotf_type {
+	TRADITIONAL_GAMMA_SDR = 0,
+	TRADITIONA_GAMMA_HDR,
+	SMPTE_ST2084,
+	FUTURE_EOTF
+};
+
+/* HDR Metadata */
+struct hdr_static_metadata {
+	uint16_t eotf;
+	uint16_t type;
+	uint16_t display_primaries_x[3];
+	uint16_t display_primaries_y[3];
+	uint16_t white_point_x;
+	uint16_t white_point_y;
+	uint16_t max_mastering_display_luminance;
+	uint16_t min_mastering_display_luminance;
+	uint16_t max_fall;
+	uint16_t max_cll;
+	uint16_t min_cll;
+};
+
 #define DRM_MODE_PAGE_FLIP_EVENT 0x01
 #define DRM_MODE_PAGE_FLIP_ASYNC 0x02
 #define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
-- 
1.7.9.5