[RFC v1 4/6] drm: Define helper function for plane color enabling

[Uma Shankar <uma.shankar@intel.com>]

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

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/drm_plane.c  |   48 ++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_color_mgmt.h |    5 +++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 72cba98..f327f56 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -144,6 +144,54 @@ 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.
+ *
+ * Drivers should use drm_atomic_helper_legacy_gamma_set() to implement the
+ * legacy &drm_crtc_funcs.gamma_set callback.
+ */
+void drm_plane_enable_color_mgmt(struct drm_plane *plane,
+				uint plane_degamma_lut_size,
+				bool plane_has_ctm,
+				uint plane_gamma_lut_size)
+{
+	struct drm_device *dev = plane->dev;
+	struct drm_mode_config *config = &dev->mode_config;
+
+	if (plane_degamma_lut_size) {
+		drm_object_attach_property(&plane->base,
+				config->plane_degamma_lut_property, 0);
+		drm_object_attach_property(&plane->base,
+				config->plane_degamma_lut_size_property,
+				plane_degamma_lut_size);
+	}
+
+	if (plane_has_ctm)
+		drm_object_attach_property(&plane->base,
+				config->plane_ctm_property, 0);
+
+	if (plane_gamma_lut_size) {
+		drm_object_attach_property(&plane->base,
+				config->plane_gamma_lut_property, 0);
+		drm_object_attach_property(&plane->base,
+				config->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 03a59cb..155a9ba 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -37,4 +37,9 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
 int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
 				 int gamma_size);
 
+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
-- 
1.7.9.5

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