Re: Aw: Re: [PATCH 09/13] PCI: mediatek: Advertise lack of MSI handling

[Marc Zyngier]

Frank,

> > > i guess it's a bug in ath10k driver or my r64 board (it is a v1.1
> > > which has missing capacitors on tx lines).
> >
> > No, this definitely looks like a bug in the MTK PCIe driver,
> > where the mutex is either not properly initialised, corrupted,
> > or the wrong pointer is passed.
>
> but why does it happen only with the ath10k-card and not the mt7612 in
> same slot?

Does mt7612 use MSI? What we have here is a bogus mutex in the
MTK PCIe driver, and the only way not to get there would be
to avoid using MSIs.

> > This r64 machine is supposed to have working MSIs, right?
>
> imho mt7622 have working MSI
>
> > Do you get the same issue without this series?
>
> tested 5.11.0 [1] without this series (but with your/thomas' patch
> from discussion about my old patch) and got same trace. so this series
> does not break anything here.

Can you retest without any additional patch on top of 5.11?
These two patches only affect platforms that do *not* have MSIs at all.

> > > Tried with an mt7612e, this seems to work without any errors.
> > >
> > > so for mt7622/mt7623
> > >
> > > Tested-by: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
> >
> > We definitely need to understand the above.
>
> there is a hardware-bug which may cause this...afair i saw this with
> the card in r64 with earlier Kernel-versions where other cards work
> (like the mt7612e).

I don't think a HW bug affecting PCI would cause what we are seeing
here, unless it results in memory corruption.

Thanks,

        M.
--
Jazz is not dead. It just smells funny...