Re: [PATCH v2 09/15] PM / devfreq: Switch to dev_pm_opp_find_freq_{ceil/floor}_indexed() APIs

[Chanwoo Choi <chanwoo@kernel.org>]

Hi,

On 23. 7. 20. 14:40, Manivannan Sadhasivam wrote:
> Some devfreq consumers like UFS driver need to work with multiple clocks
> through the OPP framework. For this reason, OPP framework exposes the
> _indexed() APIs for finding the floor/ceil of the supplied frequency of
> the indexed clock. So let's use them in the devfreq driver.
> 
> Currently, the clock index of 0 is used which works fine for multiple as
> well as single clock.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  drivers/devfreq/devfreq.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index e36cbb920ec8..7686993d639f 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -88,7 +88,7 @@ static unsigned long find_available_min_freq(struct devfreq *devfreq)
>  	struct dev_pm_opp *opp;
>  	unsigned long min_freq = 0;
>  
> -	opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq);
> +	opp = dev_pm_opp_find_freq_ceil_indexed(devfreq->dev.parent, &min_freq, 0);

This patch changed the used function from dev_pm_opp_find_freq_ceil
to dev_pm_opp_find_freq_ceil_indexed even if there are no supporting of the multiple clocks
and then dev_pm_opp_find_freq_ceil is not removed from OPP.

I think that it is better to use dev_pm_opp_find_freq_ceil_indexed
when need to support multiple clocks with real case.

>  	if (IS_ERR(opp))
>  		min_freq = 0;
>  	else
> @@ -102,7 +102,7 @@ static unsigned long find_available_max_freq(struct devfreq *devfreq)
>  	struct dev_pm_opp *opp;
>  	unsigned long max_freq = ULONG_MAX;
>  
> -	opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq);
> +	opp = dev_pm_opp_find_freq_floor_indexed(devfreq->dev.parent, &max_freq, 0);
>  	if (IS_ERR(opp))
>  		max_freq = 0;
>  	else
> @@ -196,7 +196,7 @@ static int set_freq_table(struct devfreq *devfreq)
>  		return -ENOMEM;
>  
>  	for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) {
> -		opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq);
> +		opp = dev_pm_opp_find_freq_ceil_indexed(devfreq->dev.parent, &freq, 0);
>  		if (IS_ERR(opp)) {
>  			devm_kfree(devfreq->dev.parent, devfreq->freq_table);
>  			return PTR_ERR(opp);
> @@ -2034,18 +2034,18 @@ struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
>  
>  	if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) {
>  		/* The freq is an upper bound. opp should be lower */
> -		opp = dev_pm_opp_find_freq_floor(dev, freq);
> +		opp = dev_pm_opp_find_freq_floor_indexed(dev, freq, 0);
>  
>  		/* If not available, use the closest opp */
>  		if (opp == ERR_PTR(-ERANGE))
> -			opp = dev_pm_opp_find_freq_ceil(dev, freq);
> +			opp = dev_pm_opp_find_freq_ceil_indexed(dev, freq, 0);
>  	} else {
>  		/* The freq is an lower bound. opp should be higher */
> -		opp = dev_pm_opp_find_freq_ceil(dev, freq);
> +		opp = dev_pm_opp_find_freq_ceil_indexed(dev, freq, 0);
>  
>  		/* If not available, use the closest opp */
>  		if (opp == ERR_PTR(-ERANGE))
> -			opp = dev_pm_opp_find_freq_floor(dev, freq);
> +			opp = dev_pm_opp_find_freq_floor_indexed(dev, freq, 0);
>  	}
>  
>  	return opp;

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi