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

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Date:	Mon, 15 Jun 2015 10:01:47 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Doug Anderson <dianders@...omium.org>
CC:	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>,
	"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>,
	Thomas Gleixner <tglx@...utronix.de>,
	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 15/06/15 08:46, Javier Martinez Canillas wrote:
[...]

>
> Sudeep, so we may need something like $subject after all from Doug's
> explanations since the combiner chip state is lost during a S2R. I know
> that it adds more duplicated code (others irqchip drivers do the same)
> and it may not scale well if a chip has many registers but is the best
> solution I could came with.
>

OK

> If you have a suggestion for a better alternative, I can give a try and
> write the patch. But I think $subject could also land to fix this issue
> since is a very non intrusive change and later can be changed once the
> irqchip core supports this use case.
>

Agreed. But I would suggest also to add MASK_ON_SUSPEND and set_irq_wake
also and then you can restore iff it's non-zero as irq core will take
care of most of the non-wakeup sources. Because I am planning to push
MASK_ON_SUSPEND to GIC and it will break this combiner if it assumes the
combiner interrupts are always on in GIC. Implement set_irq_wake as
enable_irq_wake (comb_irq_to_GIC).

Regards,
Sudeep
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