The function can only be called from a s_stream handler as it requires a
valid display list context (due to calling vsp1_uds_set_alpha() which
writes to module registers). Document the requirement.
Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
---
drivers/media/platform/vsp1/vsp1_pipe.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/media/platform/vsp1/vsp1_pipe.c
b/drivers/media/platform/vsp1/vsp1_pipe.c
index cb67b8f80635..a9a754e17e8d 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,
--
2.7.3
--
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