linux-kernel - Re: [PATCH 02/16] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation

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Message-Id: <200811201226.00286.david-b@pacbell.net>
Date:	Thu, 20 Nov 2008 12:25:59 -0800
From:	David Brownell <david-b@...bell.net>
To:	Bryan Wu <cooloney@...nel.org>
Cc:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH 02/16] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation

On Monday 17 November 2008, Bryan Wu wrote:
> From: Michael Hennerich <michael.hennerich@...log.com>
> 
> Fix erroneous SPI Clock divisor calculation. Make sure SPI_BAUD is
> always >= 2. Writing a value of 0 or 1 to the SPI_BAUD register disables
> the serial clock.
> 
> Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
> Signed-off-by: Bryan Wu <cooloney@...nel.org>

Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>

> ---
>  arch/blackfin/include/asm/bfin5xx_spi.h |    2 ++
>  drivers/spi/spi_bfin5xx.c               |    3 +++
>  2 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/blackfin/include/asm/bfin5xx_spi.h b/arch/blackfin/include/asm/bfin5xx_spi.h
> index 9fa1915..b16c3cd 100644
> --- a/arch/blackfin/include/asm/bfin5xx_spi.h
> +++ b/arch/blackfin/include/asm/bfin5xx_spi.h
> @@ -21,6 +21,8 @@
>  #ifndef _SPI_CHANNEL_H_
>  #define _SPI_CHANNEL_H_
>  
> +#define MIN_SPI_BAUD_VAL	2
> +
>  #define SPI_READ              0
>  #define SPI_WRITE             1
>  
> diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
> index e9b7366..a38106a 100644
> --- a/drivers/spi/spi_bfin5xx.c
> +++ b/drivers/spi/spi_bfin5xx.c
> @@ -158,6 +158,9 @@ static u16 hz_to_spi_baud(u32 speed_hz)
>  	if ((sclk % (2 * speed_hz)) > 0)
>  		spi_baud++;
>  
> +	if (spi_baud < MIN_SPI_BAUD_VAL)
> +		spi_baud = MIN_SPI_BAUD_VAL;
> +
>  	return spi_baud;
>  }
>  
> -- 
> 1.5.6.3
> 
> 


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