linux-kernel - Re: [PATCH] GPIO button wth wakeup attribute is supposed to wake the system up

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Message-ID: <20140619114006.72ac8e06@alan.etchedpixels.co.uk>
Date:	Thu, 19 Jun 2014 11:40:06 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:	"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] GPIO button wth wakeup attribute is supposed to wake
 the system up

On Thu, 19 Jun 2014 08:51:25 +0800
"Li, Aubrey" <aubrey.li@...ux.intel.com> wrote:

> When the wakeup attribute is set, the GPIO button is capable of
> waking up the system from sleep states, including the "freeze"
> sleep state.  For that to work, its driver needs to pass the
> IRQF_NO_SUSPEND flag to devm_request_any_context_irq(), or the
> interrupt will be disabled by suspend_device_irqs() and the
> system won't be woken up by it from the "freeze" sleep state.
> 
> The suspend_device_irqs() routine is a workaround for drivers
> that mishandle interrupts triggered when the devices handled
> by them are suspended, so it is safe to use IRQF_NO_SUSPEND in
> all drivers that don't have that problem.
> 
> The affected/tested machines include Dell Venue 11 Pro and Asus T100TA.
> 
> Signed-off-by: Aubrey Li <aubrey.li@...ux.intel.com>
> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Reviewed-by: Alan Cox <alan@...ux.intel.com>

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