linux-kernel - Re: [PATCH 3/3] irqchip: dw-apb-ictl: add PM support

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Date:	Wed, 8 Oct 2014 19:31:23 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/3] irqchip: dw-apb-ictl: add PM support

Hi Thomas, Sebastian,

On Tue, 30 Sep 2014 14:52:54 -0700
Thomas Gleixner <tglx@...utronix.de> wrote:

> On Tue, 30 Sep 2014, Sebastian Hesselbarth wrote:
> > On 09/23/2014 08:35 AM, Jisheng Zhang wrote:
> > > This patch adds in support for S2R for dw-apb-ictl irqchip driver.
> > > 
> > > Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> > > ---
> > >   drivers/irqchip/irq-dw-apb-ictl.c | 19 +++++++++++++++++++
> > >   1 file changed, 19 insertions(+)
> > > 
> > > diff --git a/drivers/irqchip/irq-dw-apb-ictl.c
> > > b/drivers/irqchip/irq-dw-apb-ictl.c
> > > index c136b67..53bb732 100644
> > > --- a/drivers/irqchip/irq-dw-apb-ictl.c
> > > +++ b/drivers/irqchip/irq-dw-apb-ictl.c
> > > @@ -50,6 +50,21 @@ static void dw_apb_ictl_handler(unsigned int irq,
> > > struct irq_desc *desc)
> > >   	chained_irq_exit(chip, desc);
> > >   }
> > > 
> > > +#ifdef CONFIG_PM
> > > +static void dw_apb_ictl_resume(struct irq_data *d)
> > > +{
> > > +	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
> > > +	struct irq_chip_type *ct = irq_data_get_chip_type(d);
> > > +
> > > +	irq_gc_lock(gc);
> > > +	writel_relaxed(~0, gc->reg_base + ct->regs.enable);
> > > +	writel_relaxed(*ct->mask_cache, gc->reg_base + ct->regs.mask);
> > > +	irq_gc_unlock(gc);
> > > +}
> > 
> > I agree with the overall change, but may this also be suited for a
> > generic irq_chip helper instead of being a driver specific one?
> > 
> > Maybe Thomas or Jason can comment on this.
> 
> If we have enough similar resume callbacks, yes. 
>  
> > Also, now that you are using writel_relaxed, I understand that both
> > writes above can happen in any order? Are there any implication we
> > have to consider, i.e. do we require any of the registers above to
> > be written first?

The registers sits at device type memory, the writes should happen in the same
order as before.

Thanks for reviewing,
Jisheng

> 
> Was about to ask that as well :)
> 
> Thanks,
> 
> 	tglx

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