[U-Boot] [PATCH] mmc/dw_mmc: Fix clock divider calculation error for bypass mode

[Pantelis Antoniou]

Hi Chin,

On Jun 10, 2014, at 9:26 AM, Chin Liang See wrote:

> To fix the clock divider calculation error when the controller
> clock same as the operating frequency. This is known as bypass
> mode. In this mode, the divider should be 0.
> 
> Signed-off-by: Chin Liang See <clsee at altera.com>
> Cc: Pantelis Antoniou <panto at antoniou-consulting.com>
> Cc: Rajeshwari Shinde <rajeshwari.s at samsung.com>
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: Mischa Jonker <mjonker at synopsys.com>
> ---
> drivers/mmc/dw_mmc.c |    5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
> index 5bf36a0..0df30bc 100644
> --- a/drivers/mmc/dw_mmc.c
> +++ b/drivers/mmc/dw_mmc.c
> @@ -245,7 +245,10 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
> 		return -EINVAL;
> 	}
> 
> -	div = DIV_ROUND_UP(sclk, 2 * freq);
> +	if (sclk == freq)
> +		div = 0;	/* bypass mode */
> +	else
> +		div = DIV_ROUND_UP(sclk, 2 * freq);
> 
> 	dwmci_writel(host, DWMCI_CLKENA, 0);
> 	dwmci_writel(host, DWMCI_CLKSRC, 0);
> -- 
> 1.7.9.5
> 

Applied, thanks.

-- Pantelis