linux-kernel - [PATCH 4/6] [media] media-devnode: Implement dev_pm

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Message-Id: <1427818501-10201-5-git-send-email-tomeu.vizoso@collabora.com>
Date:	Tue, 31 Mar 2015 18:14:48 +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>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] [media] media-devnode: Implement dev_pm_ops.prepare callback

Have it return 1 so that media device nodes 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/media-devnode.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index ebf9626..2c36d0a 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -76,8 +76,18 @@ static void media_devnode_release(struct device *cd)
 		mdev->release(mdev);
 }
 
+static int media_bus_prepare(struct device *dev)
+{
+	return 1;
+}
+
+static const struct dev_pm_ops media_bus_pm_ops = {
+	.prepare = media_bus_prepare,
+};
+
 static struct bus_type media_bus_type = {
 	.name = MEDIA_NAME,
+	.pm = &media_bus_pm_ops,
 };
 
 static ssize_t media_read(struct file *filp, char __user *buf,
-- 
2.3.4

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