Re: [PATCH 2/2] spi/fsl-espi: Make sure pm is within 2..32

[Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>]

On Thu, 15 Mar 2012 18:42:32 +0100, Sebastian Andrzej Siewior <bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org> wrote:
> The reference manual says that pm has to stay within 2 and 32. So the
> lowest frequency is 32 and DIV16 set, the highest is 2 and DIV16 unset.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>

Applied, thanks.

g.

> ---
>  drivers/spi/spi-fsl-espi.c |   10 ++++++----
>  1 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
> index 43350f9..7523a24 100644
> --- a/drivers/spi/spi-fsl-espi.c
> +++ b/drivers/spi/spi-fsl-espi.c
> @@ -182,16 +182,18 @@ static int fsl_espi_setup_transfer(struct spi_device *spi,
>  		cs->hw_mode |= CSMODE_DIV16;
>  		pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4);
>  
> -		WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
> +		WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. "
>  			  "Will use %d Hz instead.\n", dev_name(&spi->dev),
> -			  hz, mpc8xxx_spi->spibrg / 1024);
> -		if (pm > 16)
> -			pm = 16;
> +				hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1)));
> +		if (pm > 33)
> +			pm = 33;
>  	} else {
>  		pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4);
>  	}
>  	if (pm)
>  		pm--;
> +	if (pm < 2)
> +		pm = 2;
>  
>  	cs->hw_mode |= CSMODE_PM(pm);
>  
> -- 
> 1.7.9.1
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.

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