[U-Boot] [PATCH 05/10] AVR32: macb - Disable 100mbps if clock is slow

[Ben Warren]

Olav Morken wrote:
> For 100mbps operation, the ethernet controller requires a 25 MHz clock
> in MII mode, and a 50 MHz clock in RMII mode. If the clock is slower,
> disable 100mbps mode.
>
> Signed-off-by: Gunnar Rangoy <gunnar at rangoy.com>
> Signed-off-by: Paul Driveklepp <pauldriveklepp at gmail.com>
> Signed-off-by: Olav Morken <olavmrk at gmail.com>
> ---
>  drivers/net/macb.c |   23 ++++++++++++++++++++++-
>  1 files changed, 22 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/net/macb.c b/drivers/net/macb.c
> index 08bebf7..4fef374 100644
> --- a/drivers/net/macb.c
> +++ b/drivers/net/macb.c
> @@ -296,8 +296,29 @@ static void macb_phy_reset(struct macb_device *macb)
>  	struct eth_device *netdev = &macb->netdev;
>  	int i;
>  	u16 status, adv;
> +	int rmii_mode;
> +	unsigned min_hz;
> +
> +#ifdef CONFIG_RMII
> +	rmii_mode = 1;
> +	min_hz = 50000000;
> +#else
> +	rmii_mode = 0;
> +	min_hz = 25000000;
> +#endif
> +
> +	adv = ADVERTISE_CSMA | ADVERTISE_ALL ;
> +
> +	if (get_hsb_clk_rate() < min_hz) {
> +		printf("%s: HSB clock < %u MHz in %s mode - "
> +		       "disabling 100mbit.\n", netdev->name, min_hz / 1000000,
> +		       (rmii_mode ? "RMII" : "MII"));
> +
> +		adv &= ~ADVERTISE_100FULL;
> +		adv &= ~ADVERTISE_100HALF;
> +		adv &= ~ADVERTISE_100BASE4;
> +	}
>  
> -	adv = ADVERTISE_CSMA | ADVERTISE_ALL;
>  	macb_mdio_write(macb, MII_ADVERTISE, adv);
>  	printf("%s: Starting autonegotiation...\n", netdev->name);
>  	macb_mdio_write(macb, MII_BMCR, (BMCR_ANENABLE
>   
Applied to net/testing.

regards,
Ben