linux-kernel - Re: PM / wakeup: Add dev_wakeup

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Message-ID: <8d434829-ba4d-e2be-9889-3f6eb88c46b8@st.com>
Date:   Fri, 20 Mar 2020 12:48:38 +0000
From:   Patrice CHOTARD <patrice.chotard@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Erwan LE RAY <erwan.leray@...com>,
        "Alexandre TORGUE" <alexandre.torgue@...com>,
        Fabrice GASNIER <fabrice.gasnier@...com>
Subject: Re: PM / wakeup: Add dev_wakeup_path() helper

Hi Ulf

On 3/20/20 12:55 PM, Ulf Hansson wrote:
> On Fri, 20 Mar 2020 at 12:32, <patrice.chotard@...com> wrote:
>> From: Patrice Chotard <patrice.chotard@...com>
>>
>> Add dev_wakeup_path() helper to avoid to spread
>> dev->power.wakeup_path test in drivers.
> I am okay adding a helper, but would appreciate if you send a series
> to convert those using the flag currently.

Ok, we wanted to be sure that this helper will be accepted before updating our driver with it.

A new series will be sent including this patch and driver using it.

>
>> In case CONFIG_PM_SLEEP is not set, wakeup_path is not defined,
>> dev_wakeup_path() is returning false.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard@...com>
>> ---
>>
>> Currently, in mainline kernel, no drivers are testing dev->power.wakeup_path
>> for PM purpose. A stm32 serial driver patch will be submitted soon and will
>> make usage of this helper.
>>
>>  include/linux/pm_wakeup.h | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h
>> index aa3da6611533..d0bd13c19253 100644
>> --- a/include/linux/pm_wakeup.h
>> +++ b/include/linux/pm_wakeup.h
>> @@ -84,6 +84,11 @@ static inline bool device_may_wakeup(struct device *dev)
>>         return dev->power.can_wakeup && !!dev->power.wakeup;
>>  }
>>
>> +static inline bool device_wakeup_path(struct device *dev)
>> +{
>> +       return !!dev->power.wakeup_path;
> Why using "!!" here?

right, not needed,  wakeup_path is already a boolean....

Thanks

Patrice

>
>> +}
>> +
>>  static inline void device_set_wakeup_path(struct device *dev)
>>  {
>>         dev->power.wakeup_path = true;
>> @@ -174,6 +179,11 @@ static inline bool device_may_wakeup(struct device *dev)
>>         return dev->power.can_wakeup && dev->power.should_wakeup;
>>  }
>>
>> +static inline bool device_wakeup_path(struct device *dev)
>> +{
>> +       return false;
>> +}
>> +
>>  static inline void device_set_wakeup_path(struct device *dev) {}
>>
>>  static inline void __pm_stay_awake(struct wakeup_source *ws) {}
>> --
>> 2.17.1
>>
> Kind regards
> Uffe