On Tue, Apr 13, 2021 at 02:12:59PM +0100, Russell King - ARM Linux admin wrote: > On Tue, Apr 13, 2021 at 11:59:20AM +0800, DENG Qingfang wrote: > > Within 12 hours, I got some spontaneous link down/ups when EEE is enabled: > > > > [16334.236233] mt7530 mdio-bus:1f wan: Link is Down > > [16334.241340] br-lan: port 3(wan) entered disabled state > > [16337.355988] mt7530 mdio-bus:1f wan: Link is Up - 1Gbps/Full - flow control rx/tx > > [16337.363468] br-lan: port 3(wan) entered blocking state > > [16337.368638] br-lan: port 3(wan) entered forwarding state > > > > The cable is a 30m Cat.6 and never has such issue when EEE is disabled. > > Perhaps WAKEUP_TIME_1000/100 or some PHY registers need to be fine-tuned, > > but for now I think it should be disabled by default. > > Experience with Atheros AR8035 which has a very similar issue would > suggest that before resorting to the blunt hammer of disabling > SmartEEE, one should definitely experiment with the 1G Tw settings. > > Using 24us for 1G speeds on AR8035 helps a great deal, whereas the PHY > defaults to 17us for 1G and 23us for 100M. I set the 1G Tw to maximum 255us and still got the link issue..
