linux-kernel - Re: [PATCH] gpio/mxc: make it work with imx6q

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Date:	Wed, 21 Sep 2011 20:23:41 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Jamie Iles <jamie@...ieiles.com>
CC:	Shawn Guo <shawn.guo@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <patches@...aro.org>
Subject: Re: [PATCH] gpio/mxc: make it work with imx6q

On Tue, Sep 20, 2011 at 02:05:09PM +0100, Jamie Iles wrote:
> Hi Shawn,
> 
> On Mon, Sep 19, 2011 at 05:10:32PM +0800, Shawn Guo wrote:
> > The imx6q is a Cortex-A9 Quad Core SoC, which has GIC as the primary
> > interrupt controller.  GIC requires gpio irq handler to signal EOI,
> > otherwise system will hang whenever there is a gpio irq triggered.
> > 
> > Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> > ---
> >  drivers/gpio/gpio-mxc.c |    3 +++
> >  1 files changed, 3 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
> > index 4340aca..00b4c9c 100644
> > --- a/drivers/gpio/gpio-mxc.c
> > +++ b/drivers/gpio/gpio-mxc.c
> > @@ -233,6 +233,9 @@ static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc)
> >  	u32 irq_stat;
> >  	struct mxc_gpio_port *port = irq_get_handler_data(irq);
> >  
> > +	if (desc->irq_data.chip->irq_eoi)
> > +		desc->irq_data.chip->irq_eoi(&desc->irq_data);
> > +
> >  	irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR);
> >  
> >  	mxc_gpio_irq_handler(port, irq_stat);
> > -- 
> > 1.7.4.1
> 
> Could this make use of the chained_irq_enter/chained_irq_exit functions 
> added in 10a8c38 (ARM: 6806/1: irq: introduce entry and exit functions 
> for chained handlers)?
> 
Yes.  Will respin the patch to use it.

Thanks for the point, Jamie.

-- 
Regards,
Shawn

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