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SubjectRe: [PATCH v2 3/5] devfreq: add devfreq_suspend/resume() functions
Hi Lukasz,

On 2018년 12월 03일 23:31, Lukasz Luba wrote:
> This patch adds implementation for global suspend/resume for
> devfreq framework. System suspend will next use these functions.
>
> The patch is based on earlier work by Tobias Jakobi.

Please remove it from each patch description.

>
> Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
> Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
> drivers/devfreq/devfreq.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/devfreq.h | 6 ++++++
> 2 files changed, 48 insertions(+)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 36bed24..7d60423 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -935,6 +935,48 @@ int devfreq_resume_device(struct devfreq *devfreq)
> EXPORT_SYMBOL(devfreq_resume_device);
>
> /**
> + * devfreq_suspend() - Suspend devfreq governors and devices
> + *
> + * Called during system wide Suspend/Hibernate cycles for suspending governors
> + * and devices preserving the state for resume. On some platforms the devfreq
> + * device must have precise state (frequency) after resume in order to provide
> + * fully operating setup.
> + */
> +void devfreq_suspend(void)
> +{
> + struct devfreq *devfreq;
> + int ret;
> +
> + mutex_lock(&devfreq_list_lock);
> + list_for_each_entry(devfreq, &devfreq_list, node) {
> + ret = devfreq_suspend_device(devfreq);
> + if (ret)
> + dev_warn(&devfreq->dev, "device suspend failed\n");

When I checked the cpufreq_suspend(), cpufreq_suspend() prints message as 'err' level.
I think that dev_err is more proper than dev_warn.

I'm not sure what is more correct log.
But, 'devfreq->dev' device has the separate suspend/resume function.
So, I think that devfreq_suspend() should print error log containing
that it is error by devfreq framework.

"device suspend failed"
-> "failed to suspend devfreq device"

> + }
> + mutex_unlock(&devfreq_list_lock);
> +}
> +
> +/**
> + * devfreq_resume() - Resume devfreq governors and devices
> + *
> + * Called during system wide Suspend/Hibernate cycle for resuming governors and
> + * devices that are suspended with devfreq_suspend().
> + */
> +void devfreq_resume(void)
> +{
> + struct devfreq *devfreq;
> + int ret;
> +
> + mutex_lock(&devfreq_list_lock);
> + list_for_each_entry(devfreq, &devfreq_list, node) {
> + ret = devfreq_resume_device(devfreq);
> + if (ret)
> + dev_warn(&devfreq->dev, "device resume failed\n");

ditto.

"device resume failed"
-> "failed to resume devfreq device"


> + }
> + mutex_unlock(&devfreq_list_lock);
> +}
> +
> +/**
> * devfreq_add_governor() - Add devfreq governor
> * @governor: the devfreq governor to be added
> */
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index d985199..fbffa74 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -205,6 +205,9 @@ extern void devm_devfreq_remove_device(struct device *dev,
> extern int devfreq_suspend_device(struct devfreq *devfreq);
> extern int devfreq_resume_device(struct devfreq *devfreq);
>
> +extern void devfreq_suspend(void);
> +extern void devfreq_resume(void);
> +
> /**
> * update_devfreq() - Reevaluate the device and configure frequency
> * @devfreq: the devfreq device
> @@ -331,6 +334,9 @@ static inline int devfreq_resume_device(struct devfreq *devfreq)
> return 0;
> }
>
> +static inline void devfreq_suspend(void) {}
> +static inline void devfreq_resume(void) {}
> +
> static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
> unsigned long *freq, u32 flags)
> {
>

--
Best Regards,
Chanwoo Choi
Samsung Electronics

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