[v3 01/14] 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.

v2: Rebase and modified the metadata structure elements
as per Ville's POC changes.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/drm_connector.c |  6 ++++++
 include/drm/drm_connector.h     | 10 ++++++++++
 include/drm/drm_mode_config.h   |  6 ++++++
 include/linux/hdmi.h            | 10 ++++++++++
 include/uapi/drm/drm_mode.h     | 16 ++++++++++++++++
 5 files changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index da8ae80..361fcda 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1027,6 +1027,12 @@ int drm_connector_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.non_desktop_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 9be2181..2ee45dc 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -520,6 +520,13 @@ struct drm_connector_state {
 	 * and the connector bpc limitations obtained from edid.
 	 */
 	u8 max_bpc;
+
+	/**
+	 * @metadata_blob_ptr:
+	 * DRM blob property for HDR metadata
+	 */
+	struct drm_property_blob *hdr_source_metadata_blob_ptr;
+	u8 hdr_metadata_changed : 1;
 };
 
 /**
@@ -1154,6 +1161,9 @@ struct drm_connector {
 	 * &drm_mode_config.connector_free_work.
 	 */
 	struct llist_node free_node;
+
+	/* HDR metdata */
+	struct hdr_static_metadata hdr_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 69ccd27..4b3211b 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -836,6 +836,12 @@ struct drm_mode_config {
 	 */
 	struct drm_property *writeback_out_fence_ptr_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/linux/hdmi.h b/include/linux/hdmi.h
index d2bacf5..bed3e08 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -137,6 +137,16 @@ enum hdmi_content_type {
 	HDMI_CONTENT_TYPE_GAME,
 };
 
+enum hdmi_metadata_type {
+	HDMI_STATIC_METADATA_TYPE1 = 1,
+};
+
+enum hdmi_eotf {
+	HDMI_EOTF_TRADITIONAL_GAMMA_SDR,
+	HDMI_EOTF_TRADITIONAL_GAMMA_HDR,
+	HDMI_EOTF_SMPTE_ST2084,
+};
+
 struct hdmi_avi_infoframe {
 	enum hdmi_infoframe_type type;
 	unsigned char version;
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index a439c2e..5012af2 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -630,6 +630,22 @@ struct drm_color_lut {
 	__u16 reserved;
 };
 
+/* HDR Metadata */
+struct hdr_static_metadata {
+	uint8_t eotf;
+	uint8_t metadata_type;
+	struct {
+		uint16_t x, y;
+		} display_primaries[3];
+	struct {
+		uint16_t x, y;
+		} white_point;
+	uint16_t max_mastering_display_luminance;
+	uint16_t min_mastering_display_luminance;
+	uint16_t max_fall;
+	uint16_t max_cll;
+};
+
 #define DRM_MODE_PAGE_FLIP_EVENT 0x01
 #define DRM_MODE_PAGE_FLIP_ASYNC 0x02
 #define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
-- 
1.9.1