[RFC 12/33] drm: Reset pipeline when user sends NULL blob

[Uma Shankar]

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

User can disable the color pipeline entirely, thereby
disabling all the color hardware blocks in the pipeline.

User should set NULL as the blob id and invoke SET_COLOR_PIPELINE
property. Driver will disable all the color hardware blocks by
updating respective blob id's as NULL.

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_atomic_uapi.c | 50 +++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 20f9366865ca..259cd4f5f520 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -411,6 +411,53 @@ drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
  * available at driver level, the driver should check for
  * the sanity of the userspace data.
  */
+static
+int drm_plane_reset_color_op_blobs(struct drm_plane *plane,
+				   struct drm_plane_state *state,
+				   bool *replaced)
+{
+	struct drm_device *dev = plane->dev;
+	int ret;
+	bool blob_replaced = false;
+	bool temp_replaced = false;
+
+	ret = drm_atomic_replace_property_blob_from_id(dev,
+						       &state->color.ctm,
+						       0, -1, -1,
+						       &blob_replaced);
+	temp_replaced |= blob_replaced;
+	if (ret)
+		goto out;
+
+	ret = drm_atomic_replace_property_blob_from_id(dev,
+						       &state->color.pre_csc_lut,
+						       0, -1, -1,
+						       &blob_replaced);
+	temp_replaced |= blob_replaced;
+
+	if (ret)
+		goto out;
+
+	ret = drm_atomic_replace_property_blob_from_id(dev,
+						       &state->color.post_csc_lut,
+						       0, -1, -1,
+						       &blob_replaced);
+	temp_replaced |= blob_replaced;
+
+	ret = drm_atomic_replace_property_blob_from_id(dev,
+						       &state->color.private_color_op_data,
+						       0, -1, -1,
+						       &blob_replaced);
+	temp_replaced |= blob_replaced;
+
+	if (ret)
+		goto out;
+out:
+	if (!ret)
+		*replaced |= temp_replaced;
+	return ret;
+}
+
 static
 int drm_plane_replace_color_op_blobs(struct drm_plane *plane,
 				     struct drm_plane_state *state,
@@ -425,6 +472,9 @@ int drm_plane_replace_color_op_blobs(struct drm_plane *plane,
 	bool blob_replaced = false;
 	bool temp_replaced = false;
 
+	if (!color_pipeline_blob_id)
+		return drm_plane_reset_color_op_blobs(plane, state, replaced);
+
 	new_blob = drm_property_lookup_blob(dev, color_pipeline_blob_id);
 
 	if (!new_blob) {
-- 
2.38.1