[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 <sei.fumizono.jw@hitachi-solutions.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
index 913485a..4e61886 100644 (file)
--- a/drivers/media/platform/vsp1/vsp1_drv.c
+++ b/drivers/media/platform/vsp1/vsp1_drv.c
@@ -1,7 +1,7 @@
 /*
  * vsp1_drv.c  --  R-Car VSP1 Driver
  *
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
+ * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  *
@@ -403,7 +403,10 @@ static int vsp1_pm_suspend(struct device *dev)
        if (vsp1->ref_count == 0)
                return 0;
 
+       vsp1_pipelines_suspend(vsp1);
+
        clk_disable_unprepare(vsp1->clock);
+
        return 0;
 }
 
@@ -413,10 +416,14 @@ static int vsp1_pm_resume(struct device *dev)
 
        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
 

diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index d91f19a..c4b0621 100644 (file)
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -1,7 +1,7 @@
 /*
  * 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 (laurent.pinchart@ideasonboard.com)
  *
@@ -703,6 +703,74 @@ void vsp1_pipeline_propagate_alpha(struct vsp1_pipeline *pipe,
        }
 }
 
+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);
+       }
+}
+
 /* -----------------------------------------------------------------------------
  * videobuf2 Queue Operations
  */

diff --git a/drivers/media/platform/vsp1/vsp1_video.h b/drivers/media/platform/vsp1/vsp1_video.h
index fd2851a..0887a4d 100644 (file)
--- a/drivers/media/platform/vsp1/vsp1_video.h
+++ b/drivers/media/platform/vsp1/vsp1_video.h
@@ -1,7 +1,7 @@
 /*
  * 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 (laurent.pinchart@ideasonboard.com)
  *
@@ -149,4 +149,7 @@ 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__ */