linux-kernel - Re: [PATCH V2 03/14] irqchip: Mask the non-type/sense bits when translating an IRQ

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Message-ID: <5719E3B4.1030902@arm.com>
Date:	Fri, 22 Apr 2016 09:41:24 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Jon Hunter <jonathanh@...dia.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	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>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>
Cc:	Kevin Hilman <khilman@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-tegra@...r.kernel.org, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 03/14] irqchip: Mask the non-type/sense bits when
 translating an IRQ

On 20/04/16 12:03, Jon Hunter wrote:
> The firmware parameter that contains the IRQ sense bits may also contain
> other data. When return the IRQ type, bits outside of these sense bits
> should be masked. If these bits are not masked and
> irq_create_fwspec_mapping() is called to map an IRQ, then the comparison
> of the type returned from irq_domain_translate() will never match
> that returned by irq_get_trigger_type() (because this function masks the
> none sense bits) and so we will always call irq_set_irq_type() to program
> the type even if it was not really necessary.
> 
> Currently, the downside to this is unnecessarily re-programmming the type
> but nevertheless this should be avoided.
> 
> The Tegra LIC and TI Crossbar irqchips all have client instances (from
> reviewing the device-tree sources) where bits outside the IRQ sense bits
> are set, but do not mask these bits. Therefore, ensure these bits are
> masked for these irqchips.
> 
> Signed-off-by: Jon Hunter <jonathanh@...dia.com>

Acked-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...