Re: [PATCH v4] PCI: Disable broken FLR on MediaTek MT7925

[Alex Williamson <alex@shazbot.org>]

On Tue,  9 Jun 2026 17:33:33 +0200
Jose Ignacio Tornos Martinez <jtornosm@redhat.com> wrote:

> Hello Bjorn,
> 
> 
> > Alex, are you OK with this?  The v2 conversation talks about SBR also
> > being broken, but maybe that turned out to be a red herring?
> > 
> >  https://lore.kernel.org/linux-pci/20260508145153.717641-1-jtornosm@redhat.com/t/#u  
> Alex can answer better, but to clarify: SBR works correctly for MT7925e.
> The confusion in v2 was because I initially grouped MT7925e together with
> Qualcomm devices (WCN6855, WCN7850, SDX modems) to try to fix their reset
> issues. Alex suggested testing SBR for all of them, which revealed they
> have different issues:
> - MT7925e: FLR advertised but broken, SBR works fine (this patch - quirk_no_flr)
> - Qualcomm devices: No FLR capability, SBR is broken (separate series with
>   quirk_no_bus_reset + device-specific reset)
> So I split them into separate patches since the root causes are different.
> This fix for MT7925e (quirk_no_flr) removes the broken FLR and allows the
> working SBR to be used.

Yes, this patch follows our standard practice of quirking out known
broken reset mechanisms and the qcom devices are now handled in a
different series.  I'm ok with this.  Thanks,

Alex