1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index 4b0ac07af662..b4687a834f85 100644
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -488,11 +488,17 @@ static bool vsp1_pipeline_ready(struct vsp1_pipeline *pipe)
  * This function completes the current buffer by filling its sequence number,
  * time stamp and payload size, and hands it back to the videobuf core.
  *
+ * When operating in DU output mode (deep pipeline to the DU through the LIF),
+ * the VSP1 needs to constantly supply frames to the display. In that case, if
+ * no other buffer is queued, reuse the one that has just been processed instead
+ * of handing it back to the videobuf core.
+ *
  * Return the next queued buffer or NULL if the queue is empty.
  */
 static struct vsp1_video_buffer *
 vsp1_video_complete_buffer(struct vsp1_video *video)
 {
+        struct vsp1_pipeline *pipe = to_vsp1_pipeline(&video->video.entity);
         struct vsp1_video_buffer *next = NULL;
         struct vsp1_video_buffer *done;
         unsigned long flags;
@@ -507,6 +513,13 @@ vsp1_video_complete_buffer(struct vsp1_video *video)
 
         done = list_first_entry(&video->irqqueue,
                                 struct vsp1_video_buffer, queue);
+
+        /* In DU output mode reuse the buffer if the list is singular. */
+        if (pipe->lif && list_is_singular(&video->irqqueue)) {
+                spin_unlock_irqrestore(&video->irqlock, flags);
+                return done;
+        }
+
         list_del(&done->queue);
 
         if (!list_empty(&video->irqqueue))