Xiaomi R4A Gigabit 21.02 problem with 100mbps ethernet WAN

[Paul9]

I have the same problem using Xiaomi Mi Router 3G (OpenWrt 21.02.1 r16325-88151b8303). When during boot time a 100Mb/s link is connected to the WAN, the WAN port keeps going up and down. Using the ethtool does not solve the problem.

# ethtool -s wan speed 100 duplex full autoneg off
# ethtool wan
Settings for wan:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  100baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 1
        Transceiver: external
        Auto-negotiation: off
        Supports Wake-on: d
        Wake-on: d
        Link detected: yes
# ethtool wan
Settings for wan:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  100baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 1
        Transceiver: external
        Auto-negotiation: off
        Supports Wake-on: d
        Wake-on: d
        Link detected: no
# ethtool wan
Settings for wan:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  100baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 1
        Transceiver: external
        Auto-negotiation: off
        Supports Wake-on: d
        Wake-on: d
        Link detected: yes
# ethtool wan
Settings for wan:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  100baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 1
        Transceiver: external
        Auto-negotiation: off
        Supports Wake-on: d
        Wake-on: d
        Link detected: no

[   36.993659] mt7530 mdio-bus:1f wan: Link is Down
[   52.353818] mt7530 mdio-bus:1f wan: Link is Up - 100Mbps/Full - flow control rx/tx
[   53.377667] mt7530 mdio-bus:1f wan: Link is Down
[   66.689801] mt7530 mdio-bus:1f wan: Link is Up - 100Mbps/Full - flow control rx/tx
[   67.713646] mt7530 mdio-bus:1f wan: Link is Down
[   81.025823] mt7530 mdio-bus:1f wan: Link is Up - 100Mbps/Full - flow control rx/tx
[   82.049664] mt7530 mdio-bus:1f wan: Link is Down
[   95.361805] mt7530 mdio-bus:1f wan: Link is Up - 100Mbps/Full - flow control rx/tx
[   96.385649] mt7530 mdio-bus:1f wan: Link is Down
[  138.369814] mt7530 mdio-bus:1f wan: Link is Up - 100Mbps/Full - flow control rx/txt 

Need to reboot with a 1000Mb/s link connected to WAN to resolve the problem, connecting a 100Mb/s link afterwards works fine.

# ethtool wan
Settings for wan:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: Symmetric
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 1
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Link detected: yes
# ethtool wan
Settings for wan:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
        Link partner advertised pause frame use: Symmetric
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 1
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Link detected: yes

Edit:

I found recent comments in different posts which seem to be using master/openwrt 21.02 and have a similar issue:

21.02 rc4: mt7530 mdio-bus:1f lan1: Link is Down, Link is Up

I am testing OpenWrt 21.02 RC4 (a custom build with wpad-mesh-wolfssl and non CT drivers, based on this commit) a mesh router connected to: an ADSL router via ethernet another mesh router 802.11s mesh mode The internet connection is quite intermittent some times and when debugging the logs I found out this on the router: Tue Aug 3 15:10:37 2021 kern.info kernel: [40216.869351] mt7530 mdio-bus:1f lan1: Link is Up - 100Mbps/Full - flow control off Tue Aug 3 15:10:54 2021 kern.info kernel: [4…

21.02 rc4: mt7530 mdio-bus:1f lan1: Link is Down, Link is Up

I am having the similar issue on ubnt x-SPF; The wan port keeps flapping up and down and causes not being able to complete PPPoE. The dsl modem is SR501 with 100mbp port at Feb 19 22:20:26 2022 daemon.notice netifd: Network device 'eth4' link is up Sat Feb 19 22:20:26 2022 daemon.notice netifd: Interface 'dsl_wan' has link connectivity Sat Feb 19 22:20:26 2022 daemon.notice netifd: Interface 'dsl_wan' is setting up now Sat Feb 19 22:20:26 2022 daemon.notice netifd: Interface 'wan_modem' has l…

Mtk_soc_eth watchdog timeout after r11573

So far so good with the 20.02 snapshots for me personally, so very happy with that. Unfortunately, I do still run into another issue, where the port randomly disconnects and reconnects. Anyone experiencing the same issue? This is just getting spammed over and over again in my dmesg log: [2612337.641359] mt7530 mdio-bus:1f lan1: Link is Down [2612337.646999] br-lan: port 1(lan1) entered disabled state [2612378.601396] mt7530 mdio-bus:1f lan1: Link is Up - 1Gbps/Full - flow control rx/tx [2612378…