[media] v4l: vsp1: Fix Suspend-to-RAM

Fix Suspend-to-RAM so that VSP1 driver continues to work after resuming.

In detail,
- Fix the judgment of ref count in resuming.
- Add stopping VSP1 during suspend.

[Refactor the suspend and resume code to lower suspend delay]

Signed-off-by: Sei Fumizono <[e-mail]>
Signed-off-by: Yoshifumi Hosoya <[e-mail]>
Signed-off-by: Yoshihiro Kaneko <[e-mail]>
Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/vsp1/vsp1_drv.c

···
 /*
  * vsp1_drv.c  --  R-Car VSP1 Driver
  *
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
+ * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
  * Contact: Laurent Pinchart ([e-mail])
  *
···
 	if (vsp1->ref_count == 0)
 		return 0;
 
+	vsp1_pipelines_suspend(vsp1);
+
 	clk_disable_unprepare(vsp1->clock);
+
 	return 0;
 }
 
···
 
 	WARN_ON(mutex_is_locked(&vsp1->lock));
 
-	if (vsp1->ref_count)
+	if (vsp1->ref_count == 0)
 		return 0;
 
-	return clk_prepare_enable(vsp1->clock);
+	clk_prepare_enable(vsp1->clock);
+
+	vsp1_pipelines_resume(vsp1);
+
+	return 0;
 }
 #endif
 

drivers/media/platform/vsp1/vsp1_video.c

···
 /*
  * vsp1_video.c  --  R-Car VSP1 Video Node
  *
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
+ * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
  * Contact: Laurent Pinchart ([e-mail])
  *
···
 
 		pad = &entity->pads[entity->source_pad];
 		pad = media_entity_remote_pad(pad);
+	}
+}
+
+void vsp1_pipelines_suspend(struct vsp1_device *vsp1)
+{
+	unsigned long flags;
+	unsigned int i;
+	int ret;
+
+	/* To avoid increasing the system suspend time needlessly, loop over the
+	 * pipelines twice, first to set them all to the stopping state, and then
+	 * to wait for the stop to complete.
+	 */
+	for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
+		struct vsp1_rwpf *wpf = vsp1->wpf[i];
+		struct vsp1_pipeline *pipe;
+
+		if (wpf == NULL)
+			continue;
+
+		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
+		if (pipe == NULL)
+			continue;
+
+		spin_lock_irqsave(&pipe->irqlock, flags);
+		if (pipe->state == VSP1_PIPELINE_RUNNING)
+			pipe->state = VSP1_PIPELINE_STOPPING;
+		spin_unlock_irqrestore(&pipe->irqlock, flags);
+	}
+
+	for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
+		struct vsp1_rwpf *wpf = vsp1->wpf[i];
+		struct vsp1_pipeline *pipe;
+
+		if (wpf == NULL)
+			continue;
+
+		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
+		if (pipe == NULL)
+			continue;
+
+		ret = wait_event_timeout(pipe->wq,
+					 pipe->state == VSP1_PIPELINE_STOPPED,
+					 msecs_to_jiffies(500));
+		if (ret == 0)
+			dev_warn(vsp1->dev, "pipeline %u stop timeout\n",
+				 wpf->entity.index);
+	}
+}
+
+void vsp1_pipelines_resume(struct vsp1_device *vsp1)
+{
+	unsigned int i;
+
+	/* Resume pipeline all running pipelines. */
+	for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
+		struct vsp1_rwpf *wpf = vsp1->wpf[i];
+		struct vsp1_pipeline *pipe;
+
+		if (wpf == NULL)
+			continue;
+
+		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
+		if (pipe == NULL)
+			continue;
+
+		if (vsp1_pipeline_ready(pipe))
+			vsp1_pipeline_run(pipe);
 	}
 }
 

drivers/media/platform/vsp1/vsp1_video.h

···
 /*
  * vsp1_video.h  --  R-Car VSP1 Video Node
  *
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
+ * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
  * Contact: Laurent Pinchart ([e-mail])
  *
···
 void vsp1_pipeline_propagate_alpha(struct vsp1_pipeline *pipe,
 				   struct vsp1_entity *input,
 				   unsigned int alpha);
+
+void vsp1_pipelines_suspend(struct vsp1_device *vsp1);
+void vsp1_pipelines_resume(struct vsp1_device *vsp1);
 
 #endif /* __VSP1_VIDEO_H__ */