linux-kernel - Re: [PATCH] PM: suspend_device_irqs(): don't disable wakeup IRQs

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Date:	Wed, 6 May 2009 18:44:01 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	Kim Kyuwon <chammoru@...il.com>
Cc:	Kevin Hilman <khilman@...prootsystems.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] PM: suspend_device_irqs(): don't disable wakeup IRQs

2009/5/6 Kim Kyuwon <chammoru@...il.com>:
> 2009/5/7 Arve Hjønnevåg <arve@...roid.com>:
>> On Wed, May 6, 2009 at 5:16 PM, Kevin Hilman
>> <khilman@...prootsystems.com> wrote:
>>> "Rafael J. Wysocki" <rjw@...k.pl> writes:
>>>
>>>> On Wednesday 06 May 2009, Kevin Hilman wrote:
>>>>> Kevin Hilman <khilman@...prootsystems.com> writes:
>>
>>> There is at least one problem with that which is why Kyuwon Kim added
>>> the ->disable hook to OMAP's irq_chip.  The problem is with drivers
>>> that call disable_irq() in their suspend hook, usually done to prevent
>>> the device from waking the system since on OMAP, any IRQ can be
>>> configured to wake the system.
>>>
>>
>> This does not sound correct. disable_irq_wake should be used for this.
>> A driver may need to mask its interrupt before suspending but this
>> should not also disable it as a wakeup source.
>
> I wish I could use disable_irq_wake(), but it doesn't work in OMAP.

This does not sound like a hardware problem.

-- 
Arve Hjønnevåg
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