MT7621 ethernet does not get probed on net-next branch after 5.15 merge

[Sergio Paracuellos]

Hi Qingfang,

On Fri, Oct 15, 2021 at 4:23 PM DENG Qingfang <dqfext at gmail.com> wrote:
>
> Hi,
>
> After the merge of 5.15.y into net-next, MT7621 ethernet
> (mtk_eth_soc.c) does not get probed at all.
>
> Kernel log before 5.15 merge:
> ...
> libphy: Fixed MDIO Bus: probed
> libphy: mdio: probed
> mt7530 mdio-bus:1f: MT7530 adapts as multi-chip module
> mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 20
> mt7621-pci 1e140000.pcie: host bridge /pcie at 1e140000 ranges:
> ...
>
> Kernel log after 5.15 merge:
> ...
> libphy: Fixed MDIO Bus: probed
> mt7621-pci 1e140000.pcie: host bridge /pcie at 1e140000 ranges:
> ...
>
>
> I tried adding debug prints into the .mtk_probe function, but it did
> not execute.
> There are no dts changes for MT7621 between 5.14 and 5.15, so I
> believe it should be something else.
>
> Any ideas?

I had time to create a new image for my gnubee board using kernel 5.15
and this problem does not exist on my side. Since no more mails have
come for a while I guess this was a problem from your configuration,
but just in case I preferred to answer to let you know. I am currently
using v5.15.7 from linux-stable with some other patches that will be
for 5.16. Just in case, you can check the kernel tree [0] I am
currently using.

Best regards,
     Sergio Paracuellos

[0]: https://github.com/paraka/linux/tree/gbpc1-5.15