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-rw-r--r--drivers/media/platform/vsp1/vsp1_pipe.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_pipe.c b/drivers/media/platform/vsp1/vsp1_pipe.c
index cb67b8f..a9a754e 100644
--- a/drivers/media/platform/vsp1/vsp1_pipe.c
+++ b/drivers/media/platform/vsp1/vsp1_pipe.c
@@ -318,6 +318,9 @@ done:
* to be scaled, we disable alpha scaling when the UDS input has a fixed alpha
* value. The UDS then outputs a fixed alpha value which needs to be programmed
* from the input RPF alpha.
+ *
+ * This function can only be called from a subdev s_stream handler as it
+ * requires a valid display list context.
*/
void vsp1_pipeline_propagate_alpha(struct vsp1_pipeline *pipe,
struct vsp1_entity *input,