linux-kernel - Re: [PATCH v3 1/6] irqchip: add support for Marvell Orion SoCs

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Date:	Tue, 11 Jun 2013 15:45:25 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	John Stultz <john.stultz@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] irqchip: add support for Marvell Orion SoCs

On Tue, 11 Jun 2013, Sebastian Hesselbarth wrote:

> On 06/11/13 15:30, Thomas Gleixner wrote:
> > On Tue, 11 Jun 2013, Thomas Gleixner wrote:
> > 
> > > On Thu, 6 Jun 2013, Sebastian Hesselbarth wrote:
> > > 
> > > > This patch adds an irqchip driver for the main interrupt controller
> > > > found
> > > > on Marvell Orion SoCs (Kirkwood, Dove, Orion5x, Discovery Innovation).
> > > > Corresponding device tree documentation is also added.
> > > > 
> > > > Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> > > 
> > > Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> > 
> > Second thoughts:
> > 
> > > +static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc
> > > *desc)
> > > +{
> > > +	struct irq_domain *d = irq_get_handler_data(irq);
> > > +	struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, irq);
> > > +	u32 stat = readl_relaxed(gc->reg_base + ORION_BRIDGE_IRQ_CAUSE) &
> > > +		gc->mask_cache;
> > 
> > In init you map the first irq of that chip and install the chain
> > handler for it. Now if that first irq fires, isn't that set in the
> > cause register as well? And what acks that first irq?
> 
> It is "acked" by acking all unmasked bridge irqs.

Ok. A comment would be nice.

But what about the bit in of that first irq in the cause register? If
it's set on entry you call generic_handle_irq() for that as well. So
if it's set you need to mask it in stat. If not, then it wants a
comment.

Thanks,

	tglx
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