Re: [PATCH 4.2-rc1 v21 3/6] irqchip: gic: Introduce plumbing for IPI FIQ

From	Holger Schurig <holgerschurig@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 4.2-rc1 v21 3/6] irqchip: gic: Introduce plumbing for IPI FIQ
Date	2015-07-07 12:10 +0200
Message-ID	<pJxZ8-4kL-17@gated-at.bofh.it> (permalink)
References	<pJetr-ty-3@gated-at.bofh.it> <pJets-ty-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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> Currently it is not possible to exploit FIQ for systems with a GIC, even
> on systems are otherwise capable of it. This patch makes it possible
> for IPIs to be delivered using FIQ.

I wonder if gic_set_group_irq() can easily be married with mxc_set_irq_fiq().

The driver sound/soc/fsl/imx-pcm-fiq.c uses mxc_set_irq_fiq() to
connect an (assembly) FIQ handler with a hardware IRQ. However, the
underlying implementation of mxc_set_irq_fiq() is only supported for
TZIC and AVIC (see arch/arm/mach-imx/irq-common.c).

On my i.MX6, which doesn't have an AVIC/TZIC but a GIC I could use a
method to turn a normal IRQ into a FIQ :-)
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Re: [PATCH 4.2-rc1 v21 3/6] irqchip: gic: Introduce plumbing for IPI FIQ Holger Schurig <holgerschurig@gmail.com> - 2015-07-07 12:10 +0200

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