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    Subject[PATCH v2 5/7] [media] v4l2-core: Implement dev_pm_ops.prepare()
    Date
    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@collabora.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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