From: Russell King <[email protected]> Date: Fri, 15 Dec 2017 16:10:20 +0000
> Observed on the 88e1512 in SGMII-to-Copper mode, negotiating pause > is unreliable. While the pause bits can be set in the advertisment > register, they clear shortly after negotiation with a link partner > commences irrespective of the cause of the negotiation. > > While these bits may be correctly conveyed to the link partner on the > first negotiation, a subsequent negotiation (eg, due to negotiation > restart by the link partner, or reconnection of the cable) will result > in the link partner seeing these bits as zero, while the kernel > believes that it has advertised pause modes. > > This leads to the local kernel evaluating (eg) symmetric pause mode, > while the remote end evaluates that we have no pause mode capability. > > Since we can't guarantee the advertisment, disable pause mode support > with this PHY when used in SGMII-to-Copper mode. > > The 88e1510 in RGMII-to-Copper mode appears to behave correctly. > > Reviewed-by: Andrew Lunn <[email protected]> > Signed-off-by: Russell King <[email protected]> Applied.
