linux-kernel - Re: [PATCH v2 1/1] irqchip: exynos-combiner: Save IRQ enable set on suspend

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Date:	Fri, 12 Jun 2015 19:42:27 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Sudeep Holla <sudeep.holla@....com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Chanho Park <parkch98@...il.com>,
	Doug Anderson <dianders@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kukjin Kim <kgene@...nel.org>,
	Peter Chubb <peter.chubb@...ta.com.au>,
	Shuah Khan <shuahkhan@...il.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/1] irqchip: exynos-combiner: Save IRQ enable set on
 suspend

On 12.06.2015 19:10, Sudeep Holla wrote:
> 
> 
> On 12/06/15 06:43, Javier Martinez Canillas wrote:
>> The Exynos interrupt combiner IP loses its state when the SoC enters
>> into a low power state during a Suspend-to-RAM. This means that if a
>> IRQ is used as a source, the interrupts for the devices are disabled
>> when the system is resumed from a sleep state so are not triggered.
>>
>> Save the interrupt enable set register for each combiner group and
>> restore it after resume to make sure that the interrupts are enabled.
>>
> 
> Not sure if you need this. IMO it's not clean and redundant though I
> admit many drivers do exactly same thing. I am trying to remove or point
> out those redundant code as irqchip core has options/flags to do what
> you need. I assume there are no wakeup sources connected to this
> combiner.

It may have wake up sources connected. Correct me if I am wrong but (at
least) on Exynos5250 combiner takes care of gpx1 GPIO pins which may be
external interrupts (e.g. power key on Exynos5250 Snow). I didn't check
other boards.

Best regards,
Krzysztof

> Setting irqchip flags should solve this problem. A simple
> patch below should do the job ?
> 
> -->8
> 
> diff --git a/drivers/irqchip/exynos-combiner.c
> b/drivers/irqchip/exynos-combiner.c
> index 5945223b73fa..c0bcec59f829 100644
> --- a/drivers/irqchip/exynos-combiner.c
> +++ b/drivers/irqchip/exynos-combiner.c
> @@ -111,6 +111,7 @@ static struct irq_chip combiner_chip = {
>  #ifdef CONFIG_SMP
>         .irq_set_affinity       = combiner_set_affinity,
>  #endif
> +       .flags                  = IRQCHIP_MASK_ON_SUSPEND,
>  };
> 
> 
> 

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