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SubjectRe: [PATCH 1/2] net: ethernet: nb8800: Do not apply TX delay at MAC level
Date
Sebastian Frias <sf84@laposte.net> writes:

> 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.

The Broadcom GENET driver does the same thing.

> Signed-off-by: Sebastian Frias <sf84@laposte.net>
> ---
> 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)
> break;
>
> case PHY_INTERFACE_MODE_RGMII_TXID:
> - pad_mode = PAD_MODE_RGMII | PAD_MODE_GTX_CLK_DELAY;
> + pad_mode = PAD_MODE_RGMII;
> break;
>
> default:
> --
> 1.7.11.2

If this change is correct (and I'm not convinced it is), that case
should be merged with the one above it and PHY_INTERFACE_MODE_RGMII_RXID
added as well.

--
Måns Rullgård

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