Subject: Re: [PATCH V2 03/14] irqchip: Mask the non-type/sense bits when
 translating an IRQ
To: Jon Hunter <jonathanh@nvidia.com>, Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>, Rob Herring <robh+dt@kernel.org>,
        Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Stephen Warren <swarren@wwwdotorg.org>,
        Thierry Reding <thierry.reding@gmail.com>
References: <1461150237-15580-1-git-send-email-jonathanh@nvidia.com>
 <1461150237-15580-4-git-send-email-jonathanh@nvidia.com>
Cc: Kevin Hilman <khilman@kernel.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Linus Walleij <linus.walleij@linaro.org>, linux-tegra@vger.kernel.org,
        linux-omap@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
From: Marc Zyngier <marc.zyngier@arm.com>
Organization: ARM Ltd
Message-ID: <5719E3B4.1030902@arm.com>
Date: Fri, 22 Apr 2016 09:41:24 +0100
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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@nvidia.com>

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

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