linux-kernel - Re: [PATCH v3 1/4] PM / Runtime: Add getter for quering the IRQ safe option

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Date:	Mon, 15 Sep 2014 10:57:24 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
cc:	Russell King <linux@....linux.org.uk>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	<linux-kernel@...r.kernel.org>, <dmaengine@...r.kernel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-pm@...r.kernel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v3 1/4] PM / Runtime: Add getter for quering the IRQ safe
 option

On Mon, 15 Sep 2014, Krzysztof Kozlowski wrote:

> Add a simple getter pm_runtime_is_irq_safe() for quering whether runtime
> PM IRQ safe was set or not.
> 
> Various bus drivers implementing runtime PM may use choose to suspend
> differently based on IRQ safeness status of child driver (e.g. do not
> unprepare the clock if IRQ safe is not set).
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
>  include/linux/pm_runtime.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> index 367f49b9a1c9..44d74f0f182e 100644
> --- a/include/linux/pm_runtime.h
> +++ b/include/linux/pm_runtime.h
> @@ -128,6 +128,11 @@ static inline void pm_runtime_mark_last_busy(struct device *dev)
>  	ACCESS_ONCE(dev->power.last_busy) = jiffies;
>  }
>  
> +static inline bool pm_runtime_is_irq_safe(struct device *dev)
> +{
> +	return dev->power.irq_safe;
> +}
> +

If you add something to the runtime PM API, you must update the 
documentation file (Documentation/power/runtime_pm.txt) 
correspondingly.

Alan Stern

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