linux-kernel - Re: [PATCH v2 1/5] devfreq: refactor set

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Date:   Tue, 04 Dec 2018 13:39:45 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Lukasz Luba <l.luba@...tner.samsung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org
Cc:     tjakobi@...h.uni-bielefeld.de, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com, rjw@...ysocki.net, len.brown@...el.com,
        pavel@....cz, gregkh@...uxfoundation.org, keescook@...omium.org,
        anton@...msg.org, ccross@...roid.com, tony.luck@...el.com,
        robh+dt@...nel.org, mark.rutland@....com, kgene@...nel.org,
        krzk@...nel.org, m.szyprowski@...sung.com, b.zolnierkie@...sung.com
Subject: Re: [PATCH v2 1/5] devfreq: refactor set_target frequency function

Hi Lukasz,

On 2018년 12월 03일 23:31, Lukasz Luba wrote:
> The refactoring is needed for the new client in devfreq: suspend.
> To avoid code duplication, move it to the new local function
> devfreq_set_target.
> 
> The patch is based on earlier work by Tobias Jakobi.

As I already commented, Please remove it. You already mentioned it on cover-letter.
If you want to contain the contribution history of Tobias, you might better
to add 'Signed-off-by' or others.

> 
> Suggested-by: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
> Suggested-by: Chanwoo Choi <cw00.choi@...sung.com>
> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
> ---
>  drivers/devfreq/devfreq.c | 62 +++++++++++++++++++++++++++--------------------
>  1 file changed, 36 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 1414130..a9fd61b 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -285,6 +285,40 @@ static int devfreq_notify_transition(struct devfreq *devfreq,
>  	return 0;
>  }
>  
> +static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
> +			      u32 flags)
> +{
> +	struct devfreq_freqs freqs;
> +	unsigned long cur_freq;
> +	int err = 0;
> +
> +	if (devfreq->profile->get_cur_freq)
> +		devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
> +	else
> +		cur_freq = devfreq->previous_freq;
> +
> +	freqs.old = cur_freq;
> +	freqs.new = new_freq;
> +	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
> +
> +	err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags);
> +	if (err) {
> +		freqs.new = cur_freq;
> +		devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
> +		return err;
> +	}
> +
> +	freqs.new = new_freq;
> +	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
> +
> +	if (devfreq_update_status(devfreq, new_freq))
> +		dev_err(&devfreq->dev,
> +			"Couldn't update frequency transition information.\n");
> +
> +	devfreq->previous_freq = new_freq;
> +	return err;
> +}
> +
>  /* Load monitoring helper functions for governors use */
>  
>  /**
> @@ -296,8 +330,7 @@ static int devfreq_notify_transition(struct devfreq *devfreq,
>   */
>  int update_devfreq(struct devfreq *devfreq)
>  {
> -	struct devfreq_freqs freqs;
> -	unsigned long freq, cur_freq, min_freq, max_freq;
> +	unsigned long freq, min_freq, max_freq;
>  	int err = 0;
>  	u32 flags = 0;
>  
> @@ -333,31 +366,8 @@ int update_devfreq(struct devfreq *devfreq)
>  		flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
>  	}
>  
> -	if (devfreq->profile->get_cur_freq)
> -		devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
> -	else
> -		cur_freq = devfreq->previous_freq;
> -
> -	freqs.old = cur_freq;
> -	freqs.new = freq;
> -	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
> +	return devfreq_set_target(devfreq, freq, flags);
>  
> -	err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
> -	if (err) {
> -		freqs.new = cur_freq;
> -		devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
> -		return err;
> -	}
> -
> -	freqs.new = freq;
> -	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
> -
> -	if (devfreq_update_status(devfreq, freq))
> -		dev_err(&devfreq->dev,
> -			"Couldn't update frequency transition information.\n");
> -
> -	devfreq->previous_freq = freq;
> -	return err;
>  }
>  EXPORT_SYMBOL(update_devfreq);
>  
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics