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

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?

Note: I don't have the system in our lab so that it might take time
until I get that, but I'm on it.