[U-Boot] [PATCH] tsec: Force TBI PHY to 1000Mbps full duplex in SGMII mode

[Ben Warren]

Hi Peter,

Peter Tyser wrote:
> In SGMII mode the link between a processor's internal TBI PHY and an
> external PHY should always be 1000Mbps, full duplex.  Also, the SGMII
> interface between an internal TBI PHY and external PHY does not
> support in-band auto-negotation.
>
> Previously, when configured for SGMII mode a TBI PHY would attempt to
> restart auto-negotation during initializtion.  This auto-negotation
> between a TBI PHY and external PHY would fail and result in unusable
> ethernet operation.
>
> Forcing the TBI PHY and and external PHY to link at 1000Mbps full duplex
> in SGMII mode resolves this issue of auto-negotation failing.
>
> Note that 10Mbps and 100Mbps operation is still possible on the external
> side of the external PHY even when SGMII is operating at 1000Mbps.
> The SGMII interface still operates at 1000Mbps, but each byte of data
> is repeated 100 or 10 times for 10/100Mbps and the external PHY handles
> converting this data stream into proper 10/100Mbps signalling.
>
> Signed-off-by: Peter Tyser <ptyser at xes-inc.com>
> ---
Applied to net repo.

thanks,
Ben