linux-kernel - Re: [PATCH v2 2/4] irqchip: sun4i: Fix irq 0 not working

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Message-ID: <20140313092917.GE2815@lukather>
Date:	Thu, 13 Mar 2014 10:29:17 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 2/4] irqchip: sun4i: Fix irq 0 not working

On Wed, Mar 12, 2014 at 06:17:05PM +0100, Hans de Goede wrote:
> SUN4I_IRQ_VECTOR_REG containing 0 can mean one of 3 things:
> 1) no more irqs pending
> 2) irq 0 pending
> 3) spurious irq
> 
> So if we immediately get a reading of 0, check the irq-pending reg
> to differentiate between 2 and 3. We only do this once to avoid
> the extra check in the common case of 1) hapening after having
> read the vector-reg once.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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