linux-kernel - Re: [PATCH v3 06/12] opp: Add dev_pm_opp_find_level

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Date:   Mon, 18 Jan 2021 15:28:10 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 06/12] opp: Add dev_pm_opp_find_level_ceil()

On 18-01-21, 03:55, Dmitry Osipenko wrote:
> Add a ceil version of the dev_pm_opp_find_level(). It's handy to have if
> levels don't start from 0 in OPP table and zero usually means a minimal
> level.
> 
> Tested-by: Peter Geis <pgwipeout@...il.com>
> Tested-by: Nicolas Chauvet <kwizart@...il.com>
> Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/opp/core.c     | 49 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/pm_opp.h |  8 +++++++
>  2 files changed, 57 insertions(+)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 341484d58e6c..df0969002555 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -449,6 +449,55 @@ struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
>  
> +/**
> + * dev_pm_opp_find_level_ceil() - search for an rounded up level
> + * @dev:		device for which we do this operation
> + * @level:		level to search for
> + *
> + * Return: Searches for rounded up match in the opp table and returns pointer
> + * to the  matching opp if found, else returns ERR_PTR in case of error and
> + * should be handled using IS_ERR. Error return values can be:
> + * EINVAL:	for bad pointer
> + * ERANGE:	no match found for search
> + * ENODEV:	if device not found in list of registered devices
> + *
> + * The callers are required to call dev_pm_opp_put() for the returned OPP after
> + * use.
> + */
> +struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
> +					      unsigned int *level)
> +{
> +	struct opp_table *opp_table;
> +	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
> +
> +	opp_table = _find_opp_table(dev);
> +	if (IS_ERR(opp_table)) {
> +		int r = PTR_ERR(opp_table);
> +
> +		dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
> +		return ERR_PTR(r);
> +	}
> +
> +	mutex_lock(&opp_table->lock);
> +
> +	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
> +		if (temp_opp->available && temp_opp->level >= *level) {
> +			opp = temp_opp;
> +			*level = opp->level;
> +
> +			/* Increment the reference count of OPP */
> +			dev_pm_opp_get(opp);
> +			break;
> +		}
> +	}
> +
> +	mutex_unlock(&opp_table->lock);
> +	dev_pm_opp_put_opp_table(opp_table);
> +
> +	return opp;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
> +
>  static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
>  						   unsigned long *freq)
>  {
> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> index f344be844bde..b7dc993487c7 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -111,6 +111,8 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
>  					      bool available);
>  struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
>  					       unsigned int level);
> +struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
> +					      unsigned int *level);
>  
>  struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
>  					      unsigned long *freq);
> @@ -234,6 +236,12 @@ static inline struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
>  	return ERR_PTR(-ENOTSUPP);
>  }
>  
> +static inline struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
> +					unsigned int *level)
> +{
> +	return ERR_PTR(-ENOTSUPP);
> +}
> +
>  static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
>  					unsigned long *freq)
>  {

Applied. Thanks.

-- 
viresh