Re: [PATCH 1/2] net: ethernet: nb8800: Do not apply TX delay at MAC level
From: Andrew Lunn
Date: Fri Nov 04 2016 - 11:12:00 EST
On Fri, Nov 04, 2016 at 04:02:24PM +0100, Sebastian Frias wrote:
> The delay can be applied at PHY or MAC level, but since
> PHY drivers will apply the delay at PHY level when using
> one of the "internal delay" declinations of RGMII mode
> (like PHY_INTERFACE_MODE_RGMII_TXID), applying it again
> at MAC level causes issues.
> Signed-off-by: Sebastian Frias <sf84@xxxxxxxxxxx>
> drivers/net/ethernet/aurora/nb8800.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> diff --git a/drivers/net/ethernet/aurora/nb8800.c b/drivers/net/ethernet/aurora/nb8800.c
> index b59aa35..d2855c9 100644
> --- a/drivers/net/ethernet/aurora/nb8800.c
> +++ b/drivers/net/ethernet/aurora/nb8800.c
> @@ -1282,7 +1282,7 @@ static int nb8800_tangox_init(struct net_device *dev)
> case PHY_INTERFACE_MODE_RGMII_TXID:
> - pad_mode = PAD_MODE_RGMII | PAD_MODE_GTX_CLK_DELAY;
> + pad_mode = PAD_MODE_RGMII;
How many boards use this Ethernet driver? How many boards are your
potentially breaking, because they need this delay?
I guess it is a small number, because doesn't it require the PHY is
also broken, not adding a delay when it should?