[PATCH V8 08/43] drm/colorop: Add NEXT property

[Alex Hung]

From: Harry Wentland <harry.wentland at amd.com>

We'll construct color pipelines out of drm_colorop by
chaining them via the NEXT pointer. NEXT will point to
the next drm_colorop in the pipeline, or by 0 if we're
at the end of the pipeline.

Signed-off-by: Alex Hung <alex.hung at amd.com>
Signed-off-by: Harry Wentland <harry.wentland at amd.com>
---
v8:
 - Remove null check "colorop->next_property" in drm_colorop_set_next_property

v5:
 - move next comment here from Add 3x4 CTM patch (Sebastian)
 - Add kernel doc

v4:
 - Allow setting of NEXT property to NULL (Chaitanya Kumar Borah)

v3:
 - Add next pointer to colorop to be used by drivers
   and in DRM core

 drivers/gpu/drm/drm_colorop.c | 27 +++++++++++++++++++++++++++
 include/drm/drm_colorop.h     | 17 +++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index 60edf6671643..05de9bf118ed 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -58,6 +58,7 @@ static int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
 	colorop->dev = dev;
 	colorop->type = type;
 	colorop->plane = plane;
+	colorop->next = NULL;
 
 	list_add_tail(&colorop->head, &config->colorop_list);
 	colorop->index = config->num_colorop++;
@@ -90,6 +91,16 @@ static int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
 				   colorop->bypass_property,
 				   1);
 
+	/* next */
+	prop = drm_property_create_object(dev, DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_ATOMIC,
+					  "NEXT", DRM_MODE_OBJECT_COLOROP);
+	if (!prop)
+		return -ENOMEM;
+	colorop->next_property = prop;
+	drm_object_attach_property(&colorop->base,
+				   colorop->next_property,
+				   0);
+
 	return ret;
 }
 
@@ -263,3 +274,19 @@ const char *drm_get_colorop_curve_1d_type_name(enum drm_colorop_curve_1d_type ty
 
 	return colorop_curve_1d_type_names[type];
 }
+
+/**
+ * drm_colorop_set_next_property - sets the next pointer
+ * @colorop: drm colorop
+ * @next: next colorop
+ *
+ * Should be used when constructing the color pipeline
+ */
+void drm_colorop_set_next_property(struct drm_colorop *colorop, struct drm_colorop *next)
+{
+	drm_object_property_set_value(&colorop->base,
+				      colorop->next_property,
+				      next ? next->base.id : 0);
+	colorop->next = next;
+}
+EXPORT_SYMBOL(drm_colorop_set_next_property);
diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
index 315d748e212e..7948de5c4994 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -173,6 +173,14 @@ struct drm_colorop {
 	 */
 	enum drm_colorop_type type;
 
+	/**
+	 * @next:
+	 *
+	 * Read-only
+	 * Pointer to next drm_colorop in pipeline
+	 */
+	struct drm_colorop *next;
+
 	/**
 	 * @type_property:
 	 *
@@ -200,6 +208,13 @@ struct drm_colorop {
 	 */
 	struct drm_property *curve_1d_type_property;
 
+	/**
+	 * @next_property:
+	 *
+	 * Read-only property to next colorop in the pipeline
+	 */
+	struct drm_property *next_property;
+
 };
 
 #define obj_to_colorop(x) container_of(x, struct drm_colorop, base)
@@ -276,4 +291,6 @@ const char *drm_get_colorop_type_name(enum drm_colorop_type type);
  */
 const char *drm_get_colorop_curve_1d_type_name(enum drm_colorop_curve_1d_type type);
 
+void drm_colorop_set_next_property(struct drm_colorop *colorop, struct drm_colorop *next);
+
 #endif /* __DRM_COLOROP_H__ */
-- 
2.43.0