linux-kernel - Re: [PATCH v2 RESEND] mfd: arizona: Check if AOD interrupts are pending before dispatching

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Message-ID: <20160615125145.GF4948@dell>
Date:	Wed, 15 Jun 2016 13:51:45 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 RESEND] mfd: arizona: Check if AOD interrupts are
 pending before dispatching

On Wed, 15 Jun 2016, Richard Fitzgerald wrote:

> Previously the arizona_irq_thread implementation would call
> handle_nested_irqs() to handle AOD interrupts without checking if any
> were actually pending. The kernel will see these as spurious IRQs and
> will eventually disable the IRQ.
> 
> This patch ensures we only launch the nested handler if there are AOD
> interrupts pending in the codec.
> 
> Signed-off-by: Simon Trimmer <simont@...nsource.wolfsonmicro.com>
> Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-irq.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
> index edeb495..5e18d3c 100644
> --- a/drivers/mfd/arizona-irq.c
> +++ b/drivers/mfd/arizona-irq.c
> @@ -109,8 +109,20 @@ static irqreturn_t arizona_irq_thread(int irq, void *data)
>  	do {
>  		poll = false;
>  
> -		if (arizona->aod_irq_chip)
> -			handle_nested_irq(irq_find_mapping(arizona->virq, 0));
> +		if (arizona->aod_irq_chip) {
> +			/*
> +			 * Check the AOD status register to determine whether
> +			 * the nested IRQ handler should be called.
> +			 */
> +			ret = regmap_read(arizona->regmap,
> +					  ARIZONA_AOD_IRQ1, &val);
> +			if (ret)
> +				dev_warn(arizona->dev,
> +					"Failed to read AOD IRQ1 %d\n", ret);
> +			else if (val)
> +				handle_nested_irq(
> +					irq_find_mapping(arizona->virq, 0));
> +		}
>  
>  		/*
>  		 * Check if one of the main interrupts is asserted and only

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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