[media] v4l: vsp1: Simplify frame end processing

The DRM pipeline, as it runs in automatic restart mode, never sees the
pipeline state set to VSP1_PIPELINE_STOPPING or VSP1_PIPELINE_STOPPED
when running the frame end interrupt handler. We can thus skip the
checks various checks in the handler and return immediately.

Similarly the DRM frame end handler calls vsp1_pipeline_run()
unnecessarily, as the state there is never VSP1_PIPELINE_STOPPED. Remove
the function call and the frame end handler is it's now empty.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vsp1/vsp1_drm.c

@@ -26,20 +26,6 @@
 #include "vsp1_pipe.h"
 #include "vsp1_rwpf.h"
 
-/* -----------------------------------------------------------------------------
- * Runtime Handling
- */
-
-static void vsp1_drm_pipeline_frame_end(struct vsp1_pipeline *pipe)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&pipe->irqlock, flags);
-	if (pipe->num_inputs)
-		vsp1_pipeline_run(pipe);
-	spin_unlock_irqrestore(&pipe->irqlock, flags);
-}
-
 /* -----------------------------------------------------------------------------
  * DU Driver API
  */
@@ -569,7 +555,6 @@ int vsp1_drm_init(struct vsp1_device *vsp1)
 	pipe = &vsp1->drm->pipe;
 
 	vsp1_pipeline_init(pipe);
-	pipe->frame_end = vsp1_drm_pipeline_frame_end;
 
 	/* The DRM pipeline is static, add entities manually. */
 	for (i = 0; i < vsp1->info->rpf_count; ++i) {

drivers/media/platform/vsp1/vsp1_pipe.c

@@ -289,7 +289,8 @@ void vsp1_pipeline_frame_end(struct vsp1_pipeline *pipe)
 		vsp1_dl_irq_frame_end(pipe->dl);
 
 	/* Signal frame end to the pipeline handler. */
-	pipe->frame_end(pipe);
+	if (pipe->frame_end)
+		pipe->frame_end(pipe);
 
 	spin_lock_irqsave(&pipe->irqlock, flags);
 
@@ -298,8 +299,10 @@ void vsp1_pipeline_frame_end(struct vsp1_pipeline *pipe)
 	/* When using display lists in continuous frame mode the pipeline is
 	 * automatically restarted by the hardware.
 	 */
-	if (!pipe->dl)
-		pipe->state = VSP1_PIPELINE_STOPPED;
+	if (pipe->dl)
+		goto done;
+
+	pipe->state = VSP1_PIPELINE_STOPPED;
 
 	/* If a stop has been requested, mark the pipeline as stopped and
 	 * return.