linux-kernel - Re: [PATCH] MFD: AB8500 mask off irrelevant bits from the SPI message

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Message-ID: <20100618211905.GF3582@sortiz.org>
Date:	Fri, 18 Jun 2010 23:19:06 +0200
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	linux-kernel@...r.kernel.org,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>
Subject: Re: [PATCH] MFD: AB8500 mask off irrelevant bits from the SPI
 message

Hi Linus,

On Fri, May 28, 2010 at 02:59:44AM +0200, Linus Walleij wrote:
> The registers on the AB8500 are only 8 bits wide, so the content
> of the remaining bits is undefined. Let's mask off the undefined
> stuff when returning a register in an SPI read.
Patch applied, sorry for the delay.

Cheers,
Samuel.


> Acked-by: Rabin Vincent <rabin.vincent@...ricsson.com>
> Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
> ---
>  drivers/mfd/ab8500-spi.c |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mfd/ab8500-spi.c b/drivers/mfd/ab8500-spi.c
> index b81d4f7..e1c8b62 100644
> --- a/drivers/mfd/ab8500-spi.c
> +++ b/drivers/mfd/ab8500-spi.c
> @@ -68,7 +68,12 @@ static int ab8500_spi_read(struct ab8500 *ab8500, u16 addr)
>  
>  	ret = spi_sync(spi, &msg);
>  	if (!ret)
> -		ret = ab8500->rx_buf[0];
> +		/*
> +		 * Only the 8 lowermost bytes are
> +		 * defined with value, the rest may
> +		 * vary depending on chip/board noise.
> +		 */
> +		ret = ab8500->rx_buf[0] & 0xFFU;
>  
>  	return ret;
>  }
> -- 
> 1.6.3.3
> 

-- 
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