[RFC v4 5/8] drm: Define helper function for plane color enabling

[Uma Shankar]

Define helper function to enable Plane color features
to attach plane color properties to plane structure.

v2: Rebase

v3: Modiefied the function to use updated property names.

v4: Rebase

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/drm_plane.c  | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_color_mgmt.h |  5 +++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index d0bf10b..d1b4ac1 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -144,6 +144,48 @@ static int create_in_format_blob(struct drm_device *dev, struct drm_plane *plane
 }
 
 /**
+ * drm_plane_enable_color_mgmt - enable color management properties
+ * @plane: DRM Plane
+ * @plane_degamma_lut_size: the size of the degamma lut (before CSC)
+ * @plane_has_ctm: whether to attach ctm_property for CSC matrix
+ * @plane_gamma_lut_size: the size of the gamma lut (after CSC)
+ *
+ * This function lets the driver enable the color correction
+ * properties on a plane. This includes 3 degamma, csc and gamma
+ * properties that userspace can set and 2 size properties to inform
+ * the userspace of the lut sizes. Each of the properties are
+ * optional. The gamma and degamma properties are only attached if
+ * their size is not 0 and ctm_property is only attached if has_ctm is
+ * true.
+ */
+void drm_plane_enable_color_mgmt(struct drm_plane *plane,
+				uint plane_degamma_lut_size,
+				bool plane_has_ctm,
+				uint plane_gamma_lut_size)
+{
+	if (plane_degamma_lut_size) {
+		drm_object_attach_property(&plane->base,
+				plane->degamma_lut_property, 0);
+		drm_object_attach_property(&plane->base,
+				plane->degamma_lut_size_property,
+				plane_degamma_lut_size);
+	}
+
+	if (plane_has_ctm)
+		drm_object_attach_property(&plane->base,
+				plane->ctm_property, 0);
+
+	if (plane_gamma_lut_size) {
+		drm_object_attach_property(&plane->base,
+				plane->gamma_lut_property, 0);
+		drm_object_attach_property(&plane->base,
+				plane->gamma_lut_size_property,
+				plane_gamma_lut_size);
+	}
+}
+EXPORT_SYMBOL(drm_plane_enable_color_mgmt);
+
+/**
  * drm_universal_plane_init - Initialize a new universal plane object
  * @dev: DRM device
  * @plane: plane object to init
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 44f04233..9b8e566 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -68,4 +68,9 @@ int drm_plane_create_color_properties(struct drm_plane *plane,
 				      u32 supported_ranges,
 				      enum drm_color_encoding default_encoding,
 				      enum drm_color_range default_range);
+
+void drm_plane_enable_color_mgmt(struct drm_plane *plane,
+				 uint plane_degamma_lut_size,
+				 bool plane_has_ctm,
+				 uint plane_gamma_lut_size);
 #endif
-- 
1.9.1