linux-kernel - Re: irq mask swapping during suspend/resume

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Date:	Wed, 17 Sep 2014 13:05:33 -0700
From:	Dmitry Torokhov <dtor@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Eric Caruso <ejcaruso@...gle.com>, rjw@...ysocki.net,
	linux-kernel@...r.kernel.org, Benson Leung <bleung@...gle.com>
Subject: Re: irq mask swapping during suspend/resume

Hi Thomas,

On Wednesday, September 17, 2014 12:05:42 PM Thomas Gleixner wrote:
> On Tue, 16 Sep 2014, Eric Caruso wrote:
> > We would like to be able to set different irq masks for triggers during
> > normal operation and for waking up the system. For example, while a laptop
> > is awake, closing the lid and opening the lid should both fire an
> > interrupt, but when the system is asleep, we would like to stay asleep
> > when
> > closing the lid.
> > 
> > We are thinking about stashing the irq mask used specifically for waking
> > the system up in the irq_desc struct, and then swapping it during
> > enable_irq_wake and disable_irq_wake calls. Devices that do not specify a
> > different wake mask will use their normal trigger mask for both
> > situations.
> > 
> > Is this acceptable?
> 
> Not really. Why should irq_desc provide storage for random
> configurations and bind them to some random system state?
> 
> What's wrong with calling
> 
>        irq_set_type(irq, B);
>        enable_irq_wake(irq);
> 
>        disable_irq_wake(irq);
>        irq_set_type(irq, A);

The desire is to avoid doing it in [every] driver but rather have it done
centrally by device/PM core. It does not have to be irq_desc though,
maybe you can suggest a better place for it (aside of the individual driver
code that is)?

Thanks,
Dmitry
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