On Tue, Nov 1, 2016 at 1:47 AM, Lin Huang <hl at rock-chips.com> wrote:
> Add suspend frequency support and if needed set it to
> the frequency obtained from the suspend opp (can be defined
> using opp-v2 bindings and is optional).
>
> Change-Id: Iaa0d3848d63d9ce03f65ea76f263e4685a4c295e
> Signed-off-by: Lin Huang <hl at rock-chips.com>
> ---
> drivers/devfreq/devfreq.c | 17 ++++++++++++++++-
> include/linux/devfreq.h | 9 +++++++++
> 2 files changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index bf3ea76..d1152eb 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -364,7 +364,10 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
> return;
> }
>
> - devfreq_update_status(devfreq, devfreq->previous_freq);
> + if (devfreq->suspend_freq)
> + devfreq_update_status(devfreq, devfreq->suspend_freq);
> + else
> + devfreq_update_status(devfreq, devfreq->previous_freq);
> devfreq->stop_polling = true;
> mutex_unlock(&devfreq->lock);
> cancel_delayed_work_sync(&devfreq->work);
> @@ -1251,6 +1254,18 @@ struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
> }
> EXPORT_SYMBOL(devfreq_recommended_opp);
>
> +void devfreq_opp_get_suspend_opp(struct device *dev, struct devfreq *devfreq)
> +{
> + struct dev_pm_opp *suspend_opp;
> +
> + rcu_read_lock();
> + suspend_opp = dev_pm_opp_get_suspend_opp(dev);
> + if (suspend_opp)
> + devfreq->suspend_freq = dev_pm_opp_get_freq(suspend_opp);
> + rcu_read_unlock();
> +}
> +EXPORT_SYMBOL(devfreq_opp_get_suspend_opp);
> +
Instead of exporting a new function to do this, can it be done in the
devfreq_add_device function?
> /**
> * devfreq_register_opp_notifier() - Helper function to get devfreq notified
> * for any changes in the OPP availability
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 2de4e2e..c785ad9 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -88,6 +88,7 @@ struct devfreq_dev_status {
> */
> struct devfreq_dev_profile {
> unsigned long initial_freq;
> + unsigned long suspend_freq;
> unsigned int polling_ms;
>
> int (*target)(struct device *dev, unsigned long *freq, u32 flags);
> @@ -172,6 +173,7 @@ struct devfreq {
> struct delayed_work work;
>
> unsigned long previous_freq;
> + unsigned long suspend_freq;
> struct devfreq_dev_status last_status;
>
> void *data; /* private data for governors */
> @@ -214,6 +216,8 @@ extern int devfreq_resume_device(struct devfreq *devfreq);
> /* Helper functions for devfreq user device driver with OPP. */
> extern struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
> unsigned long *freq, u32 flags);
> +extern void devfreq_opp_get_suspend_opp(struct device *dev,
> + struct devfreq *devfreq);
> extern int devfreq_register_opp_notifier(struct device *dev,
> struct devfreq *devfreq);
> extern int devfreq_unregister_opp_notifier(struct device *dev,
> @@ -348,6 +352,11 @@ static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
> return ERR_PTR(-EINVAL);
> }
>
> +static inline void devfreq_opp_get_suspend_opp(struct device *dev,
> + struct devfreq *devfreq)
> +{
> +}
> +
> static inline int devfreq_register_opp_notifier(struct device *dev,
> struct devfreq *devfreq)
> {
> --
> 2.6.6
>
