linux-kernel - Re: [PATCH v2 1/7] opp: add dev_pm_opp_get_turbo_mode

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Date:	Fri, 10 Jul 2015 11:17:54 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Thomas Abraham <thomas.ab@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Michael Turquette <mturquette@...libre.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Kevin Hilman <khilman@...aro.org>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
	Anand Moon <linux.amoon@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] opp: add dev_pm_opp_get_turbo_mode_setting() helper

On 10.07.2015 00:43, Bartlomiej Zolnierkiewicz wrote:
> Add dev_pm_opp_get_turbo_mode_setting() helper for getting turbo
> mode setting for a given opp.
> 
> Cc: Tomasz Figa <tomasz.figa@...il.com>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Javier Martinez Canillas <javier@...hile0.org>
> Cc: Thomas Abraham <thomas.ab@...sung.com>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  drivers/base/power/opp.c | 31 +++++++++++++++++++++++++++++++
>  include/linux/pm_opp.h   |  7 +++++++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
> index e24502a2..6b34b2a 100644
> --- a/drivers/base/power/opp.c
> +++ b/drivers/base/power/opp.c
> @@ -287,6 +287,37 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
>  EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
>  
>  /**
> + * dev_pm_opp_get_turbo_mode_setting() - Gets the turbo setting
> + * @opp:	opp for which turbo mode setting has to be returned for
> + *
> + * Return: turbo mode setting corresponding to the opp (true or false)
> + *
> + * Locking: This function must be called under rcu_read_lock(). opp is a rcu
> + * protected pointer. This means that opp which could have been fetched by
> + * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are
> + * under RCU lock. The pointer returned by the opp_find_freq family must be
> + * used in the same section as the usage of this function with the pointer
> + * prior to unlocking with rcu_read_unlock() to maintain the integrity of the
> + * pointer.
> + */
> +bool dev_pm_opp_get_turbo_mode_setting(struct dev_pm_opp *opp)

It is just true or false, so maybe dev_pm_opp_is_turbo_mode()?

Everything else looks good to me.

Best regards,
Krzysztof

> +{
> +	struct dev_pm_opp *tmp_opp;
> +	bool f = false;
> +
> +	opp_rcu_lockdep_assert();
> +
> +	tmp_opp = rcu_dereference(opp);
> +	if (unlikely(IS_ERR_OR_NULL(tmp_opp)) || !tmp_opp->available)
> +		pr_err("%s: Invalid parameters\n", __func__);
> +	else
> +		f = tmp_opp->turbo;
> +
> +	return f;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_get_turbo_mode_setting);
> +
> +/**
>   * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
>   * @dev:	device for which we do this operation
>   *
> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> index bb52fae..7856baf 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -30,6 +30,8 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
>  
>  unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
>  
> +bool dev_pm_opp_get_turbo_mode_setting(struct dev_pm_opp *opp);
> +
>  int dev_pm_opp_get_opp_count(struct device *dev);
>  unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
>  
> @@ -63,6 +65,11 @@ static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
>  	return 0;
>  }
>  
> +static inline bool dev_pm_opp_get_turbo_mode_setting(struct dev_pm_opp *opp)
> +{
> +	return false;
> +}
> +
>  static inline int dev_pm_opp_get_opp_count(struct device *dev)
>  {
>  	return 0;
> 

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