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

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 :-)