From 139c92866e34bfa4897e644b36147fc86cc7a7a1 Mon Sep 17 00:00:00 2001
From: Sei Fumizono <sei.fumizono.jw@hitachi-solutions.com>
Date: Sun, 15 Mar 2015 11:33:07 -0300
Subject: [PATCH] [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>
---
drivers/media/platform/vsp1/vsp1_drv.c | 13 ++++-
drivers/media/platform/vsp1/vsp1_video.c | 70 +++++++++++++++++++++++-
drivers/media/platform/vsp1/vsp1_video.h | 5 +-
3 files changed, 83 insertions(+), 5 deletions(-)
diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
index 913485a90e973..4e61886384e32 100644
--- 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 d91f19a9e1c16..c4b06214b6c18 100644
--- 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 fd2851a82e001..0887a4d2742ca 100644
--- 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__ */
--
2.30.2