linux-kernel - Re: [PATCH 08/15] iio: ti_am335x_adc: Handle overrun before threshold event

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Date:	Sat, 20 Jul 2013 12:21:15 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Zubair Lutfullah <zubair.lutfullah@...il.com>
CC:	jic23@....ac.uk, gregkh@...uxfoundation.org,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	koen@...inion.thruhere.net
Subject: Re: [PATCH 08/15] iio: ti_am335x_adc: Handle overrun before threshold
 event

On 07/18/2013 11:21 PM, Zubair Lutfullah wrote:
> From: Russ Dill <Russ.Dill@...com>
> 
> If an overrun occurs, the threshold event is meaningless, handle
> the overrun event first.
> 
> Signed-off-by: Russ Dill <Russ.Dill@...com>
> Signed-off-by: Zubair Lutfullah <zubair.lutfullah@...il.com>

This is getting a little silly.  Would Russ mind if these get
rolled up into the original patches?  Perhaps with his sign-off to
reflect his various contributions?

> ---
>  drivers/iio/adc/ti_am335x_adc.c |   24 ++++++++++--------------
>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index 1c47818..7ac28a9 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -167,7 +167,16 @@ static irqreturn_t tiadc_irq(int irq, void *private)
>  	unsigned int status, config;
>  
>  	status = tiadc_readl(adc_dev, REG_IRQSTATUS);
> -	if (status & IRQENB_FIFO1THRES) {
> +	if (status & IRQENB_FIFO1OVRRUN) {
> +		config = tiadc_readl(adc_dev, REG_CTRL);
> +		config &= ~(CNTRLREG_TSCSSENB);
> +		tiadc_writel(adc_dev, REG_CTRL, config);
> +		tiadc_writel(adc_dev, REG_IRQSTATUS,
> +				IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW);
> +		tiadc_writel(adc_dev, REG_CTRL,
> +				(config | CNTRLREG_TSCSSENB));
> +		return IRQ_HANDLED;
> +	} else if (status & IRQENB_FIFO1THRES) {
>  		tiadc_writel(adc_dev, REG_IRQCLR,
>  				IRQENB_FIFO1THRES);
>  
> @@ -180,19 +189,6 @@ static irqreturn_t tiadc_irq(int irq, void *private)
>  		tiadc_writel(adc_dev, REG_IRQSTATUS,
>  					IRQENB_FIFO1THRES);
>  		return IRQ_HANDLED;
> -	} else if ((status &  IRQENB_FIFO1OVRRUN) ||
> -			(status &  IRQENB_FIFO1UNDRFLW)) {
> -		config = tiadc_readl(adc_dev,  REG_CTRL);
> -		config &= ~(CNTRLREG_TSCSSENB);
> -		tiadc_writel(adc_dev,  REG_CTRL, config);
> -
> -		tiadc_writel(adc_dev, REG_IRQSTATUS,
> -				IRQENB_FIFO1OVRRUN |
> -				IRQENB_FIFO1UNDRFLW);
> -
> -		tiadc_writel(adc_dev,  REG_CTRL,
> -			(config |  CNTRLREG_TSCSSENB));
> -		return IRQ_HANDLED;
>  	} else {
>  		return IRQ_NONE;
>  	}
> 
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