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

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Message-ID: <557AB00C.5040606@arm.com>
Date:	Fri, 12 Jun 2015 11:10:20 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Sudeep Holla <sudeep.holla@....com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	"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 12/06/15 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. 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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