[RFC 03/33] drm: Add plane get color pipeline property

[Uma Shankar]

From: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>

Each hardware plane can consist of multiple color hardware blocks.
These hardware blocks are defined by a color pipeline. In case,
hardware blocks can be re-arranged/muxed a distinct pipeline can
be defined to represent the same.

Introduce a new enum plane property "GET_COLOR_PIPELINE" to expose
the color pipelines that a particular plane supports. This enum
property has blob id's as values. With each blob id representing
a distinct color pipeline based on underlying HW capabilities and
their respective combinations. Add helpers to create and attach
the property to a plane.

Co-developed-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
---
 drivers/gpu/drm/drm_color_mgmt.c | 46 ++++++++++++++++++++++++++++++++
 include/drm/drm_plane.h          | 10 +++++++
 2 files changed, 56 insertions(+)

diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index d021497841b8..026d057d1f1f 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -588,6 +588,52 @@ int drm_plane_create_color_properties(struct drm_plane *plane,
 }
 EXPORT_SYMBOL(drm_plane_create_color_properties);
 
+/**
+ * drm_plane_create_get_color_pipeline_property - create property to expose color pipelines
+ * @dev: DRM device
+ * @plane: plane object
+ * @num_val: number of color pipelines supported
+ *
+ * create enum property to expose color pipelines to userspace. This enum
+ * property has blob id's as values. With each blob id representing
+ * a distinct color pipeline based on underlying HW capabilities and
+ * their respective combinations.
+ */
+int drm_plane_create_get_color_pipeline_property(struct drm_device *dev,
+						 struct drm_plane *plane,
+						 int num_val)
+{
+	struct drm_property *prop;
+
+	prop = drm_property_create(dev, DRM_MODE_PROP_ENUM |
+				   DRM_MODE_PROP_IMMUTABLE,
+				   "GET_COLOR_PIPELINE", num_val);
+	if (!prop)
+		return -ENOMEM;
+
+	plane->get_color_pipeline_prop = prop;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_get_color_pipeline_property);
+
+/**
+ * drm_plane_attach_get_color_pipeline_property - attach get color pipeline property to a plane
+ * @plane: plane object
+ *
+ * Attach "GET_COLOR_PIPELINE" property to a plane. The property will be visible to
+ * the userspace once we attach the property.
+ */
+void drm_plane_attach_get_color_pipeline_property(struct drm_plane *plane)
+{
+	if (!plane->get_color_pipeline_prop)
+		return;
+
+	drm_object_attach_property(&plane->base,
+				   plane->get_color_pipeline_prop, 0);
+}
+EXPORT_SYMBOL(drm_plane_attach_get_color_pipeline_property);
+
 /**
  * drm_color_lut_check - check validity of lookup table
  * @lut: property blob containing LUT to check
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 79d62856defb..256c97ead698 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -748,6 +748,12 @@ struct drm_plane {
 	 * scaling.
 	 */
 	struct drm_property *scaling_filter_property;
+
+	/**
+	 *  @get_color_pipeline_prop: Optional Plane property to get the color pipelines
+	 *  that the plane supports
+	 */
+	struct drm_property *get_color_pipeline_prop;
 };
 
 #define obj_to_plane(x) container_of(x, struct drm_plane, base)
@@ -945,5 +951,9 @@ drm_plane_get_damage_clips(const struct drm_plane_state *state);
 
 int drm_plane_create_scaling_filter_property(struct drm_plane *plane,
 					     unsigned int supported_filters);
+int drm_plane_create_get_color_pipeline_property(struct drm_device *dev,
+						 struct drm_plane *plane,
+						 int num_val);
+void drm_plane_attach_get_color_pipeline_property(struct drm_plane *plane);
 
 #endif
-- 
2.38.1