Re: [PATCH] PCI: Disable NoSnoop and Relaxed ordering for Intel wireless BE200

On Tue, Jul 28, 2026 at 07:47:04PM +0000, Grumbach, Emmanuel wrote:
> On Tue, 2026-07-28 at 14:24 -0500, Bjorn Helgaas wrote:
> > On Tue, Jul 28, 2026 at 06:21:23PM +0000, Grumbach, Emmanuel wrote:
> > > On Tue, 2026-07-28 at 13:03 -0500, Bjorn Helgaas wrote:
> > > ...
> > 
> > > > AFAICS we still don't know why Tegra264 would set NoSnoop
> > > > and/or RlxdOrd in the MMIO read.
> > > 
> > > Me neither but... I can't comment on that. And de-facto, once it
> > > does that, the BE200 replies with the NoSnoop and RlxOrd clear
> > > in the TLP which is then considered as a malformed TLP.
> > > 
> > > > Unless iwlwifi asked for NoSnoop and/or RlxdOrd to be set, I
> > > > think it's a potential problem for drivers if Tegra264 sets
> > > > them.
> > > 
> > > I ... don't think we would do that. The driver would certainly
> > > not do that... Regarding the hardware itself, I can't comment,
> > > but I can check internally.
> > 
> > Forgot to ask, can you collect the output of "sudo lspci -vv", at
> > least for the RP and the BE200?
> > 
> > And maybe the dmesg log when booted with "log_buf_len=16M
> > pci=earlydump" as well, so we can see if attributes were enabled by a
> > bootloader?
> 
> I assume you want all this without the quirk, right?

Right.