[PATCH] gpio: mvebu: use chained_irq_{enter, exit} for GIC compatibility

[jason@lakedaemon.net (Jason Cooper)]

On Fri, Feb 07, 2014 at 12:29:19PM +0100, Thomas Petazzoni wrote:
> On currently supported SoCs, the GPIO block used on Marvell EBU SoCs
> is always connected to the Marvell MPIC. However, we are going to
> introduce the support for newer Marvell EBU SoCs that use the
> Cortex-A9 core, and therefore use the GIC as their main interrupt
> controller, to which the GPIO block controlled by the gpio-mvebu
> driver is connected.
> 
> The GIC interrupt controller driver uses the fasteoi flow handler. In
> order to ensure that the eoi hook of the GIC driver gets called, the
> GPIO driver should call chained_irq_enter() and chained_irq_exit() in
> its handler. Without this, the first GPIO interrupt locks up the
> system because it doesn't get acked at the GIC level.
> 
> This change is similar to for example commit
> 0d978eb7349941139241a99acf05de6dd49b78d1 ("gpio: davinci: use
> chained_irq_enter/chained_irq_exit API").
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
>  drivers/gpio/gpio-mvebu.c | 7 +++++++
>  1 file changed, 7 insertions(+)

Acked-by: Jason Cooper <jason@lakedaemon.net>

thx,

Jason.