linux-kernel - Re: [PATCH v5 06/12] PM / devfreq: Make update

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Message-id: <5B61702C.4090702@samsung.com>
Date:   Wed, 01 Aug 2018 17:32:44 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v5 06/12] PM / devfreq: Make update_devfreq() public

Hi Matthias,

On 2018년 07월 04일 08:46, Matthias Kaehlcke wrote:
> Currently update_devfreq() is only visible to devfreq governors outside
> of devfreq.c. Make it public to allow drivers that adjust devfreq policies
> to cause a re-evaluation of the frequency after a policy change.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>
> Reviewed-by: Brian Norris <briannorris@...omium.org>
> --
> Changes in v5:
> - none
> 
> Changed in v4:
> - added 'Reviewed-by: Brian Norris <briannorris@...omium.org>' tag
> 
> Changes in v3:
> - none
> 
> Changes in v2:
> - added 'Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>' tag
> ---
>  drivers/devfreq/governor.h | 3 ---
>  include/linux/devfreq.h    | 8 ++++++++
>  2 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
> index b81700244ce3..f53339ca610f 100644
> --- a/drivers/devfreq/governor.h
> +++ b/drivers/devfreq/governor.h
> @@ -57,9 +57,6 @@ struct devfreq_governor {
>  				unsigned int event, void *data);
>  };
>  
> -/* Caution: devfreq->lock must be locked before calling update_devfreq */
> -extern int update_devfreq(struct devfreq *devfreq);
> -
>  extern void devfreq_monitor_start(struct devfreq *devfreq);
>  extern void devfreq_monitor_stop(struct devfreq *devfreq);
>  extern void devfreq_monitor_suspend(struct devfreq *devfreq);
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 7c8dce96db73..c4f84a769cb5 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -222,6 +222,14 @@ 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);
>  
> +/**
> + * update_devfreq() - Reevaluate the device and configure frequency
> + * @devfreq:	the devfreq device
> + *
> + * Note: devfreq->lock must be held
> + */
> +extern int update_devfreq(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);
> 

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics