[U-Boot] [PATCH] NET: fec_mxc: fix MDIO clock prescaler calculation

[Stefano Babic]

Hi Marcus,

On 05/02/2014 10:54, Markus Niebel wrote:
> From: Markus Niebel <Markus.Niebel at tqs.de>
> 
> The prescaler value for MDC is calculated wrong for
> MX6S. Implement the same logic as linux here which handles
> ENET_MAC different then original FEC.
> 
> Tested on a custom board with i.MX6S and 100MBit PHY
> 
> Signed-off-by: Markus Niebel <Markus.Niebel at tqs.de>
> ---
>  drivers/net/fec_mxc.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
> index 3b2b995..4cefda4 100644
> --- a/drivers/net/fec_mxc.c
> +++ b/drivers/net/fec_mxc.c
> @@ -128,8 +128,12 @@ static void fec_mii_setspeed(struct ethernet_regs *eth)
>  	 * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
>  	 * and do not drop the Preamble.
>  	 */
> -	writel((((imx_get_fecclk() / 1000000) + 2) / 5) << 1,
> -			&eth->mii_speed);
> +	register u32 speed = DIV_ROUND_UP(imx_get_fecclk(), 5000000);
> +#ifdef FEC_QUIRK_ENET_MAC
> +	speed--;
> +#endif
> +	speed <<= 1;
> +	writel(speed, &eth->mii_speed);
>  	debug("%s: mii_speed %08x\n", __func__, readl(&eth->mii_speed));
>  }

Thanks for this - I go for merging..


Best regards,
Stefano Babic

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