linux-kernel - Re: [PATCH v2 15/16] MIPS: GIC: Use local interrupts for timer

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Date:	Fri, 5 Sep 2014 21:08:57 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Bresticker <abrestic@...omium.org>
cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jason Cooper <jason@...edaemon.net>,
	Jeffrey Deans <jeffrey.deans@...tec.com>,
	Markos Chandras <markos.chandras@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Arnd Bergmann <arnd@...db.de>,
	John Crispin <blogic@...nwrt.org>,
	David Daney <ddaney.cavm@...il.com>, linux-mips@...ux-mips.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 15/16] MIPS: GIC: Use local interrupts for timer

On Fri, 5 Sep 2014, Andrew Bresticker wrote:

> Instead of using GIC interrupt 0 for the timer (which was not even
> handled correctly by the GIC irqchip code and could conflict with an
> actual external interrupt), use the designated local interrupt for
> the GIC timer.
> 
> Also, since the timer is a per-CPU interrupt, initialize it with
> setup_percpu_irq() and enable it with enable_percpu_irq() instead
> of using direct register writes.
> 
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> ---
> No changes from v1.
> ---
>  arch/mips/kernel/cevt-gic.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/mips/kernel/cevt-gic.c b/arch/mips/kernel/cevt-gic.c
> index 6093716..cae72a4 100644
> --- a/arch/mips/kernel/cevt-gic.c
> +++ b/arch/mips/kernel/cevt-gic.c
> @@ -68,7 +68,7 @@ int gic_clockevent_init(void)
>  	if (!cpu_has_counter || !gic_frequency)
>  		return -ENXIO;
>  
> -	irq = MIPS_GIC_IRQ_BASE;
> +	irq = MIPS_GIC_LOCAL_IRQ_BASE + GIC_LOCAL_INTR_COMPARE;
>  
>  	cd = &per_cpu(gic_clockevent_device, cpu);
>  
> @@ -91,15 +91,13 @@ int gic_clockevent_init(void)
>  
>  	clockevents_register_device(cd);
>  
> -	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_MAP), 0x80000002);
> -	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), GIC_VPE_SMASK_CMP_MSK);
> +	if (!gic_timer_irq_installed) {
> +		setup_percpu_irq(irq, &gic_compare_irqaction);
> +		irq_set_handler(irq, handle_percpu_irq);
> +		gic_timer_irq_installed = 1;
> +	}
>  
> -	if (gic_timer_irq_installed)
> -		return 0;
> +	enable_percpu_irq(irq, 0);

Please use a proper IRQ_TYPE constant instead of 0

Thanks,

	tglx
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