linux-kernel - Re: [PATCH 1/1] irqchip: al-fic: add support for irq retrigger

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Date:   Mon, 09 Sep 2019 10:40:45 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Talel Shenhar <talel@...zon.com>
Cc:     <tglx@...utronix.de>, <jason@...edaemon.net>,
        <linux-kernel@...r.kernel.org>, <dwmw@...zon.co.uk>,
        <benh@...nel.crashing.org>, <hhhawa@...zon.com>,
        <ronenk@...zon.com>, <jonnyc@...zon.com>, <hanochu@...zon.com>,
        <barakw@...zon.com>
Subject: Re: [PATCH 1/1] irqchip: al-fic: add support for irq retrigger

On Mon, 09 Sep 2019 09:39:18 +0100,
Talel Shenhar <talel@...zon.com> wrote:

Hi Talel,

> 
> Introduce interrupts retrigger support for Amazon's Annapurna Labs Fabric
> Interrupt Controller.
> 
> Signed-off-by: Talel Shenhar <talel@...zon.com>
> ---
>  drivers/irqchip/irq-al-fic.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-al-fic.c b/drivers/irqchip/irq-al-fic.c
> index 1a57cee..0b0a737 100644
> --- a/drivers/irqchip/irq-al-fic.c
> +++ b/drivers/irqchip/irq-al-fic.c
> @@ -15,6 +15,7 @@
>  
>  /* FIC Registers */
>  #define AL_FIC_CAUSE		0x00
> +#define AL_FIC_SET_CAUSE	0x08
>  #define AL_FIC_MASK		0x10
>  #define AL_FIC_CONTROL		0x28
>  
> @@ -126,6 +127,16 @@ static void al_fic_irq_handler(struct irq_desc *desc)
>  	chained_irq_exit(irqchip, desc);
>  }
>  
> +static int al_fic_irq_retrigger(struct irq_data *data)
> +{
> +	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
> +	struct al_fic *fic = gc->private;
> +
> +	writel_relaxed(BIT(data->hwirq), fic->base + AL_FIC_SET_CAUSE);
> +
> +	return 1;
> +}
> +
>  static int al_fic_register(struct device_node *node,
>  			   struct al_fic *fic)
>  {
> @@ -159,6 +170,7 @@ static int al_fic_register(struct device_node *node,
>  	gc->chip_types->chip.irq_unmask = irq_gc_mask_clr_bit;
>  	gc->chip_types->chip.irq_ack = irq_gc_ack_clr_bit;
>  	gc->chip_types->chip.irq_set_type = al_fic_irq_set_type;
> +	gc->chip_types->chip.irq_retrigger = al_fic_irq_retrigger;
>  	gc->chip_types->chip.flags = IRQCHIP_SKIP_SET_WAKE;
>  	gc->private = fic;

Looks good to me. Is this a fix or a new feature? If the former, I can
queue it up for -rc1.

	M.

-- 
Jazz is not dead, it just smells funny.