On Wed, Aug 21, 2024 at 06:07:06PM +0200, Andrew Lunn wrote: > On Wed, Aug 21, 2024 at 01:46:50PM +0100, Daniel Golle wrote: > > Normally, the MDI reversal configuration is taken from the MDI_CFG pin. > > However, some hardware designs require overriding the value configured > > by that bootstrap pin. The PHY allows doing that by setting a bit which > > allows ignoring the state of the MDI_CFG pin and configuring whether > > the order of MDI pairs should be normal (ABCD) or reverse (DCBA). > > > > Introduce two boolean properties which allow forcing either normal or > > reverse order of the MDI pairs from DT. > > How does this interact with ethtool -s eth42 [mdix auto|on|off] > > In general, you want mdix auto, so the two ends figure out how the > cable is wired and so it just works. It looks like Aquantia only supports swapping pair (1,2) with pair (3,6) like it used to be for MDI-X on 100MBit/s networks. When all 4 pairs are in use (for 1000MBit/s or faster) the link does not come up with pair order is not configured correctly, either using MDI_CFG pin or using the "PMA Receive Reserved Vendor Provisioning 1" register. And yes, I did verify that Auto MDI-X is enabled in the "Autonegotiation Reserved Vendor Provisioning 1" register.
