On Thursday 04 of October 2012 14:58:33 Rajagopal Venkat wrote:
> Add devfreq suspend/resume apis for devfreq users. This patch
> supports suspend and resume of devfreq load monitoring, required
> for devices which can idle.
>
> Signed-off-by: Rajagopal Venkat <rajagopal.ven...@linaro.org>
> Acked-by: MyungJoo Ham <myungjoo....@samsung.com>
Well, I wonder if this may be tied in to the runtime PM framework, so that,
for example, pm_runtime_suspend() will automatically suspend devfreq on
success (and the runtime resume of the device will resume devfreq)?
Rafael
> ---
> drivers/devfreq/devfreq.c | 28 ++++++++++++++++++++++++++++
> drivers/devfreq/governor.h | 2 ++
> drivers/devfreq/governor_simpleondemand.c | 9 +++++++++
> include/linux/devfreq.h | 12 ++++++++++++
> 4 files changed, 51 insertions(+)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 41a4099..63e075e 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -428,6 +428,34 @@ int devfreq_remove_device(struct devfreq *devfreq)
> }
> EXPORT_SYMBOL(devfreq_remove_device);
>
> +/**
> + * devfreq_suspend_device() - Suspend devfreq of a device.
> + * @devfreq the devfreq instance to be suspended
> + */
> +int devfreq_suspend_device(struct devfreq *devfreq)
> +{
> + if (!devfreq)
> + return -EINVAL;
> +
> + return devfreq->governor->event_handler(devfreq,
> + DEVFREQ_GOV_SUSPEND, NULL);
> +}
> +EXPORT_SYMBOL(devfreq_suspend_device);
> +
> +/**
> + * devfreq_resume_device() - Resume devfreq of a device.
> + * @devfreq the devfreq instance to be resumed
> + */
> +int devfreq_resume_device(struct devfreq *devfreq)
> +{
> + if (!devfreq)
> + return -EINVAL;
> +
> + return devfreq->governor->event_handler(devfreq,
> + DEVFREQ_GOV_RESUME, NULL);
> +}
> +EXPORT_SYMBOL(devfreq_resume_device);
> +
> static ssize_t show_governor(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
> index bb3aff3..26432ac 100644
> --- a/drivers/devfreq/governor.h
> +++ b/drivers/devfreq/governor.h
> @@ -22,6 +22,8 @@
> #define DEVFREQ_GOV_START 0x1
> #define DEVFREQ_GOV_STOP 0x2
> #define DEVFREQ_GOV_INTERVAL 0x3
> +#define DEVFREQ_GOV_SUSPEND 0x4
> +#define DEVFREQ_GOV_RESUME 0x5
>
> /* Caution: devfreq->lock must be locked before calling update_devfreq */
> extern int update_devfreq(struct devfreq *devfreq);
> diff --git a/drivers/devfreq/governor_simpleondemand.c
> b/drivers/devfreq/governor_simpleondemand.c
> index cf94218..a8ba78c 100644
> --- a/drivers/devfreq/governor_simpleondemand.c
> +++ b/drivers/devfreq/governor_simpleondemand.c
> @@ -104,6 +104,15 @@ int devfreq_simple_ondemand_handler(struct devfreq
> *devfreq,
> case DEVFREQ_GOV_INTERVAL:
> devfreq_interval_update(devfreq, (unsigned int *)data);
> break;
> +
> + case DEVFREQ_GOV_SUSPEND:
> + devfreq_monitor_suspend(devfreq);
> + break;
> +
> + case DEVFREQ_GOV_RESUME:
> + devfreq_monitor_resume(devfreq);
> + break;
> +
> default:
> break;
> }
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 9cdffde..ee243a3 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -158,6 +158,8 @@ extern struct devfreq *devfreq_add_device(struct device
> *dev,
> const struct devfreq_governor *governor,
> void *data);
> extern int devfreq_remove_device(struct devfreq *devfreq);
> +extern int devfreq_suspend_device(struct devfreq *devfreq);
> +extern int devfreq_resume_device(struct devfreq *devfreq);
>
> /* Helper functions for devfreq user device driver with OPP. */
> extern struct opp *devfreq_recommended_opp(struct device *dev,
> @@ -211,6 +213,16 @@ static int devfreq_remove_device(struct devfreq *devfreq)
> return 0;
> }
>
> +static int devfreq_suspend_device(struct devfreq *devfreq)
> +{
> + return 0;
> +}
> +
> +static int devfreq_resume_device(struct devfreq *devfreq)
> +{
> + return 0;
> +}
> +
> static struct opp *devfreq_recommended_opp(struct device *dev,
> unsigned long *freq, u32 flags)
> {
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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