[PATCH 08/14] atmel_mci: rwproof is only needed since IP version 0x200

[Sascha Hauer]

On Fri, Jan 25, 2013 at 04:17:41PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
>  drivers/mci/atmel_mci.c |   10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mci/atmel_mci.c b/drivers/mci/atmel_mci.c
> index d5fdd1d..bf0adb0 100644
> --- a/drivers/mci/atmel_mci.c
> +++ b/drivers/mci/atmel_mci.c
> @@ -28,6 +28,7 @@
>  #include "atmel-mci-regs.h"
>  
>  struct atmel_mci_caps {
> +	bool    has_rwproof;
>  	bool	has_odd_clk_div;
>  };
>  
> @@ -94,7 +95,13 @@ static void atmci_set_clk_rate(struct atmel_mci *host,
>  	dev_dbg(host->hw_dev, "atmel_set_clk_rate: clkIn=%ld clkIos=%d divider=%d\n",
>  		host->bus_hz, clock_min, clkdiv);
>  
> -	host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF;
> +	/*
> +	 * WRPROOF and RDPROOF prevent overruns/underruns by
> +	 * stopping the clock when the FIFO is full/empty.
> +	 * This state is not expected to last for long.
> +	 */
> +	if (host->caps.has_rwproof)
> +		host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF;
>  
>  	atmci_writel(host, ATMCI_MR, host->mode_reg);
>  }
> @@ -470,6 +477,7 @@ static void atmci_get_cap(struct atmel_mci *host)
>  	case 0x400:
>  	case 0x300:
>  	case 0x200:
> +		host->caps.has_rwproof = 1;
>  	case 0x100:
>  	case 0x0:

By 'since' in the subject do you mean 'up to'?

Sascha

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