[PATCH v1 1/2] PM/devfreq: add suspend frequency support

[hl]

Hi Derek,

On 2016年11月01日 17:06, dbasehore . wrote:
> 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?
Seems all the devfreq opp function export a new fucntion, to be consistent,
i export devfreq_opp_get_suspend_opp().
>>   /**
>>    * 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
>>
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-- 
Lin Huang