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

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Message-ID: <4d34a0a70905061904w338457efna8a3cbb80537e0c9@mail.gmail.com>
Date:	Thu, 7 May 2009 11:04:06 +0900
From:	Kim Kyuwon <chammoru@...il.com>
To:	Arve Hjønnevåg <arve@...roid.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>, OMAP <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] PM: suspend_device_irqs(): don't disable wakeup IRQs

2009/5/7 Arve Hjønnevåg <arve@...roid.com>:
> 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.

We may need advices of TI engineers.
However, as far as I know, It is impossible to disable 'interrupt
wake-up' with interrupt enabled. Because an interrupt itself generate
a system wake-up event in OMAP3430 (Hardware level).
-- 
Kyuwon

> --
> Arve Hjønnevåg
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