linux-kernel - [PATCH 2/6] [media] v4l2-core: Implement dev_pm

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Date:	Tue, 31 Mar 2015 18:14:46 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-pm@...r.kernel.org
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Ramakrishnan Muthukrishnan <ramakrmu@...co.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] [media] v4l2-core: Implement dev_pm_ops.prepare()

Have it return 1 so that video devices that are runtime-suspended won't
be suspended when the system goes to a sleep state. This can make resume
times considerably shorter because these devices don't need to be
resumed when the system is awaken.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
 drivers/media/v4l2-core/v4l2-dev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index e2b8b3e..b74e3d3 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -219,9 +219,19 @@ static void v4l2_device_release(struct device *cd)
 		v4l2_device_put(v4l2_dev);
 }
 
+static int video_device_prepare(struct device *dev)
+{
+	return 1;
+}
+
+static const struct dev_pm_ops video_device_pm_ops = {
+	.prepare = video_device_prepare,
+};
+
 static struct class video_class = {
 	.name = VIDEO_NAME,
 	.dev_groups = video_device_groups,
+	.pm = &video_device_pm_ops,
 };
 
 struct video_device *video_devdata(struct file *file)
-- 
2.3.4

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