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

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Date:	Thu, 14 Nov 2013 03:17:57 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Magnus Damm <magnus.damm@...il.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 Magnus,

On Thursday 14 November 2013 11:03:06 Magnus Damm wrote:
> On Thu, Nov 14, 2013 at 9:07 AM, Laurent Pinchart wrote:
> > 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.

Fine with me. Could you then please update the commit message to mention that 
lazy disabling is required for IRQCHIP_MASK_ON_SUSPEND ? Same comment for 
patch 03/03.

> >> 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..

-- 
Regards,

Laurent Pinchart

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