Dead wan port on testing kernel - TP-Link Archer C6U

[KliXeR]

Describe the bug

On testing kernel 6.1 on mt7621 TP-Link Archer C6U v1 wan port is completely dead. On 5.15 works fine.

mtk_soc_eth 1e100000.ethernet wan: validation of with support 00000000,00000000,00006000 and advertisement 00000000,00000000,00000000 failed: -EINVAL
mtk_soc_eth 1e100000.ethernet wan: mtk_open: could not attach PHY: -22

OpenWrt version

r24132-359a6e36e9

OpenWrt release

SNAPSHOT

OpenWrt target/subtarget

ramips/mt7621

Device

TP-Link Archer C6U v1

Image kind

Self-built image

Steps to reproduce

Compile snapshot for TP-Link Archer C6U with testing kernel, flash to device.

Actual behaviour

Wan port is dead.

Expected behaviour

Wan port is working.

Additional info

No response

Diffconfig

No response

Terms

• I am reporting an issue for OpenWrt, not an unsupported fork.

[brada4]

Try detecting phy address on running system:
mii-tool -v -p 0 wan
...
mii-tool -v -p 4 wan

One that shows viable speeds should be edited in this line

openwrt/target/linux/ramips/dts/mt7621_tplink_archer-c6u-v1.dts

Line 211 in 0ef9274

reg = <0>;

(the mux patch took out switch port 4 and made it wan)

[KliXeR]

On 5.15 -p 0 is correct phy.

On 6.1 i got this on any phy (0, 1, 2, 3, 4):

SIOCGMIIPHY on 'wan' failed: Not supported

[brada4]

As a temporary workaround you may find unused "LAN" port, remove it from br-lan and transfer WAN-related configurations to it. But otherwise indeed it is broken.

[KosmiK2001]

Tp-link AX23 v1.x
Same problem. Dead wan port. Snapshot!

Well, commit "cc4d01cd6043edbe8191cbddea8133b6879b25ef" from 2024.02.10 - is the Last commit, when wan port works.

Kernel 6.6.23. Commit "4d3f41130e3c681d40c3599653a17bbff5d00306". Nope.

[calin2k]

bug also present on xiaomi_redmi-router-ax6s mediatek 7622 target

[KosmiK2001]

Check snapshot.
WAN in AX23 v1 now works fine.

[Borromini]

@KliXeR Can you test a recent snapshot build? This should be fixed now (see my EAP235-Wall bug report).

[KliXeR]

Yeah, thanks. Everything is working now!