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

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Message-ID: <53BDFA22.2000409@linux.intel.com>
Date:	Thu, 10 Jul 2014 10:27:46 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] GPIO button wth wakeup attribute is supposed to wake
 the system up

On 2014/7/9 20:45, Rafael J. Wysocki wrote:
> On Tuesday, July 08, 2014 05:54:35 PM Dmitry Torokhov wrote:
>> On Wed, Jul 09, 2014 at 02:59:33AM +0200, Rafael J. Wysocki wrote:
>>> On Tuesday, July 08, 2014 05:15:06 PM Dmitry Torokhov wrote:
>>>> On Wed, Jul 09, 2014 at 01:06:07AM +0200, Rafael J. Wysocki wrote:
> 
> [cut]
> 
>>>>
>>>> When device driver marks IRQ as a wakeup source I believe it is prepared
>>>> to handle it (or it would shut it off explicitly).
>>>
>>> I can agree with that.
>>>
>>> Are you suggesting that __disable_irq() should check irq_data for
>>> IRQD_WAKEUP_STATE and skip the IRQ (in the 'suspend' case) if that is set?
>>
>> Yes, something like that.
> 
> OK

Many thanks to you both for the discussion.
> 
> Aubrey, can you please check if the appended patch helps on the T100?

I verified this patch on T100, it works as expected, freeze can be waken
up by reverting my patch and applying this one.

Is this a final solution?

Thanks,
-Aubrey

> 
> Rafael
> 
> ---
>  kernel/irq/manage.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-pm/kernel/irq/manage.c
> ===================================================================
> --- linux-pm.orig/kernel/irq/manage.c
> +++ linux-pm/kernel/irq/manage.c
> @@ -385,7 +385,8 @@ setup_affinity(unsigned int irq, struct
>  void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
>  {
>  	if (suspend) {
> -		if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
> +		if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND)
> +		    || irqd_has_set(&desc->irq_data, IRQD_WAKEUP_STATE))
>  			return;
>  		desc->istate |= IRQS_SUSPENDED;
>  	}
> 
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