[RFC 04/33] drm: Add helper to add color pipeline

[Uma Shankar]

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

Create a helper function to add a color pipeline for a plane.
Color pipeline is an array of struct drm_color_op which represent
a possible logical combination of color operations. Color
operations can be re-arranged, substracted or added to create
distinct color pipelines to accurately describe the Hardware blocks
present in the display engine.

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 | 42 ++++++++++++++++++++++++++++++++
 include/drm/drm_plane.h          |  3 +++
 2 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 026d057d1f1f..43d0187faa98 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -634,6 +634,48 @@ void drm_plane_attach_get_color_pipeline_property(struct drm_plane *plane)
 }
 EXPORT_SYMBOL(drm_plane_attach_get_color_pipeline_property);
 
+/**
+ * drm_plane_add_color_pipeline - helper to add a color pipeline
+ * @plane: plane object
+ * @name: name of the color pipeline
+ * @color_pipeline: an array of 'struct drm_color_op' to represent a color pipeline
+ * @len: size of the color pipeline
+ *
+ * This helper can be used to add a distinct color pipeline to a plane. A driver
+ * can provide a meaningful name to the pipeline as it desires.
+ */
+int drm_plane_add_color_pipeline(struct drm_plane *plane, char *name,
+				 struct drm_color_op *color_pipeline,
+				 size_t len)
+{
+	int ret;
+	struct drm_property *prop;
+	struct drm_property_blob *blob;
+	u32 id = 0;
+
+	prop = plane->get_color_pipeline_prop;
+
+	if (color_pipeline && !len)
+		return -EINVAL;
+
+	if (color_pipeline) {
+		blob = drm_property_create_blob(plane->dev, len, color_pipeline);
+		if (IS_ERR(blob))
+			return PTR_ERR(blob);
+
+		id = blob->base.id;
+	};
+
+	ret = drm_property_add_enum(prop, id, name);
+	if (ret) {
+		if (blob)
+			drm_property_blob_put(blob);
+		return ret;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(drm_plane_add_color_pipeline);
+
 /**
  * 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 256c97ead698..ffd7887c2acf 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -955,5 +955,8 @@ 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);
+int drm_plane_add_color_pipeline(struct drm_plane *plane, char *name,
+				 struct drm_color_op *color_pipeline,
+				 size_t len);
 
 #endif
-- 
2.38.1