[PATCH 22.03] mvebu: cortexa9: disable devices using broken mv88e6176 switch

[Christian Marangi]

On Thu, Dec 01, 2022 at 02:23:08PM +0100, Josef Schlehofer wrote:
> On 01. 12. 22 14:19, Bjørn Mork wrote:
> 
> > I assume KERNEL_PATCHVER in target/linux/mvebu/Makefile will be fixed in
> > master as well, given that 5.10 is unsupportable on this target?
> > 
> AFAIK What should be done is to put the kernel 5.15 as the default kernel
> for mvebu. Currently, it is only as the testing kernel.
>

My 2 cent on this... A kernel upgrade is not viable for a stable
release. The problem here is simple...

Things related to VLAN are broken in 5.10 and got fixed in 5.15. DSA is
""easy enough"" to check all the changes related to VLAN and mvebu
switch and backport them to 5.10. (even warning some kernel guy once the
affected patch are found and sent to stable mailing list to ask greg to
be backported)

Problem is that we currently lack manpower to bisect this and ideally by
disabling these target we will push the community on finding the
problem.

Require some time but the fact that things are broken on 5.10 and are
fixed in 5.15 makes everything less hard to bisect... Someone can
totally have some fun building intermediate kernel 5.11, 5.12, 5.13 once
things starts to work so he can reduce the patch to check... 

AFAIK there were many changes to VLAN part and were totally related to
mvebu so it just require some user with the device and time to actually
bisect this. Once we have the affected commit we can totally backport
them and put the patch for the mvebu target and we will reenable the
affected devices.

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