Hello, I think I'm seeing an issue with the PHY hardware or PHY driver. What happens is sometimes (but not always) when I do 'ip link set eth0 down' followed by 'ip link set eth0 up' I don't ever see an auto-negotiation again. LEDs don't come on, ethtool reports 'Link detected: no'. Even physically unplugging and plugging the network cable doesn't bring it back. I have to do a reboot to get the networking back.
When the networking is started I don't see any issue forcing negotiations by unplugging and plugging the cable. I get standard messages like this all day long: [ 21.031793] 003: macb ff0b0000.ethernet eth0: link down [ 26.142835] 003: macb ff0b0000.ethernet eth0: link up (1000/Full) One thing that makes me think this is the PHY is that we have another Ethernet port using the DP83867 PHY and I can always do ifdown/ifup with it. This is using a 5.2.10 kernel on arm64 zynqmp platform with the macb driver. Is this something anyone else has seen? I know there is some Errata with this part, but I'm hoping there is something to fix or work around this. Any thoughts on where to look or add debugging would appreciated. thanks, Paul
