Hi,
Em Fri, 3 Apr 2015 14:57:54 +0200
Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> escreveu:
> 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.
I'm not a PM exprert, but that patch doesn't sound right. Not all devices
supported by v4l2-dev implement runtime suspend.
So, I guess this need to be done at driver level, not at core level.
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
> ---
> 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)
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