linux-kernel - Re: [PATCH] gpio/mxc: add chained_irq_enter/exit() to mx3_gpio_irq

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Date:	Wed, 21 Sep 2011 10:25:55 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	Jamie Iles <jamie@...ieiles.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, patches@...aro.org
Subject: Re: [PATCH] gpio/mxc: add chained_irq_enter/exit() to
 mx3_gpio_irq_handler()

On Wed, Sep 21, 2011 at 09:24:04PM +0800, Shawn Guo wrote:
> The mx3_gpio_irq_handler() is also called on imx6q which has GIC as
> the primary interrupt controller.  As GIC implements the fasteoi flow
> control, we need to add chained_irq_enter/exit() to
> mx3_gpio_irq_handler() for signaling EOI, otherwise system will hang
> whenever there is a gpio irq triggered.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> ---
> This is the second post of '[PATCH] gpio/mxc: make it work with imx6q'
> to adopt the point given by Jamie.

Nit: don't forget to include the patch version in the subject line, and I like to see the revision history appear before the s-o-b lines so that it makes it into the final commit.

I'll merge this one, thanks.
g.

> 
>  drivers/gpio/gpio-mxc.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
> index 4340aca..82f7b65 100644
> --- a/drivers/gpio/gpio-mxc.c
> +++ b/drivers/gpio/gpio-mxc.c
> @@ -30,6 +30,7 @@
>  #include <linux/of.h>
>  #include <linux/of_device.h>
>  #include <asm-generic/bug.h>
> +#include <asm/mach/irq.h>
>  
>  enum mxc_gpio_hwtype {
>  	IMX1_GPIO,	/* runs on i.mx1 */
> @@ -232,10 +233,15 @@ 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);
> +	struct irq_chip *chip = irq_get_chip(irq);
> +
> +	chained_irq_enter(chip, desc);
>  
>  	irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR);
>  
>  	mxc_gpio_irq_handler(port, irq_stat);
> +
> +	chained_irq_exit(chip, desc);
>  }
>  
>  /* MX2 has one interrupt *for all* gpio ports */
> -- 
> 1.7.4.1
> 
> 
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