linux-kernel - Re: [PATCH 01/03] gpio: rcar: Use lazy disable and mask on suspend

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Message-ID: <CANqRtoR+ngS5o77Lw1gUUzq-qcHuBZtfiiAnALvH_GsNMvNN7A@mail.gmail.com>
Date:	Thu, 14 Nov 2013 11:03:06 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	SH-Linux <linux-sh@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"Simon Horman [Horms]" <horms@...ge.net.au>
Subject: Re: [PATCH 01/03] gpio: rcar: Use lazy disable and mask on suspend

Hi Laurent,

Thanks for checking the patches.

On Thu, Nov 14, 2013 at 9:07 AM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> Hi Magnus,
>
> Thank you for the patch.
>
> On Thursday 14 November 2013 07:59:36 Magnus Damm wrote:
>> From: Magnus Damm <damm@...nsource.se>
>>
>> Set the ->irq_enable() and ->irq_disable() methods to NULL
>> to enable lazy disable of interrupts.
>
> Is that just for optimization purpose, or is there another reason ?

It is needed for IRQCHIP_MASK_ON_SUSPEND operation, which in turn is
needed for Suspend-to-RAM.

>> Also extend the code to set IRQCHIP_MASK_ON_SUSPEND which tells the core
>> that only IRQs marked as wakeups need to stay enabled during Suspend-to-RAM.
>
> Shouldn't this be split to a separate patch ?

I could split them up, but since there is a dependency and since I
mainly care about making sure Suspend-to-RAM works I preferred to keep
them together.

>> Tested on the Lager board with GPIO-keys and Suspend-to-RAM.
>>
>> Signed-off-by: Magnus Damm <damm@...nsource.se>
>> ---
>>
>>  drivers/gpio/gpio-rcar.c |    3 +--
>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> --- 0001/drivers/gpio/gpio-rcar.c
>> +++ work/drivers/gpio/gpio-rcar.c     2013-11-13 19:26:26.000000000 +0900
>> @@ -368,10 +368,9 @@ static int gpio_rcar_probe(struct platfo
>>       irq_chip->name = name;
>>       irq_chip->irq_mask = gpio_rcar_irq_disable;
>>       irq_chip->irq_unmask = gpio_rcar_irq_enable;
>> -     irq_chip->irq_enable = gpio_rcar_irq_enable;
>> -     irq_chip->irq_disable = gpio_rcar_irq_disable;
>>       irq_chip->irq_set_type = gpio_rcar_irq_set_type;
>>       irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_SET_TYPE_MASKED;
>> +     irq_chip->flags |= IRQCHIP_MASK_ON_SUSPEND;
>
> You can write it as
>
>         irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_SET_TYPE_MASKED
>                         | IRQCHIP_MASK_ON_SUSPEND;

I know. =) If that's the preferred way then..

Cheers,

/ magnus
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