[U-Boot] [PATCH 02/27] Blackfin: bfin_mac: set MDCDIV based on SCLK

[Ben Warren <biggerbadderben@gmail.com>]

Mike Frysinger wrote:
> Rather than hardcoding MDCDIV to 24 (which is correct for ~125mhz SCLK),
> use the real algorithm so it gets set correctly regardless of SCLK.
>
> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
> CC: Ben Warren <biggerbadderben@gmail.com>
>   
Acked-by: Ben Warren <biggerbadderben@gmail.com>
> ---
>  drivers/net/bfin_mac.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
> index f074f17..427478f 100644
> --- a/drivers/net/bfin_mac.c
> +++ b/drivers/net/bfin_mac.c
> @@ -345,9 +345,12 @@ static void SoftResetPHY(void)
>  }
>  #endif
>  
> +/* MDC = SCLK / MDC_freq / 2 - 1 */
> +#define MDC_FREQ_TO_DIV(mdc_freq) (get_sclk() / (mdc_freq) / 2 - 1)
> +
>  static int SetupSystemRegs(int *opmode)
>  {
> -	u16 sysctl, phydat;
> +	u16 phydat;
>  	int count = 0;
>  	/* Enable PHY output */
>  	*pVR_CTL |= CLKBUFOE;
> @@ -390,12 +393,9 @@ static int SetupSystemRegs(int *opmode)
>  # endif
>  #endif
>  
> -	/* MDC  = 2.5 MHz */
> -	sysctl = SET_MDCDIV(24);
>  	/* Odd word alignment for Receive Frame DMA word */
>  	/* Configure checksum support and rcve frame word alignment */
> -	sysctl |= RXDWA | RXCKS;
> -	*pEMAC_SYSCTL = sysctl;
> +	*pEMAC_SYSCTL = RXDWA | RXCKS | SET_MDCDIV(MDC_FREQ_TO_DIV(2500000));
>  	/* auto negotiation on  */
>  	/* full duplex */
>  	/* 100 Mbps */
>