linux-kernel - Re: [PATCH] PCI/DPC: Yet another quirk for PIO log size on Intel Raptor Lake-P

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Message-ID: <20250105082520.GT3713119@black.fi.intel.com>
Date: Sun, 5 Jan 2025 10:25:20 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Takashi Iwai <tiwai@...e.de>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/DPC: Yet another quirk for PIO log size on Intel
 Raptor Lake-P

Hi,

On Fri, Jan 03, 2025 at 04:53:15PM -0600, Bjorn Helgaas wrote:
> On Thu, Jan 02, 2025 at 05:43:13PM +0100, Takashi Iwai wrote:
> > There is yet another PCI entry for Intel Raptor Lake-P that shows the
> >   error "DPC: RP PIO log size 0 is invalid":
> >   0000:00:07.0 PCI bridge [0604]: Intel Corporation Raptor Lake-P Thunderbolt 4 PCI Express Root Port #0 [8086:a76e]
> >   0000:00:07.2 PCI bridge [0604]: Intel Corporation Raptor Lake-P Thunderbolt 4 PCI Express Root Port #2 [8086:a72f]
> > 
> > Add the corresponding quirk entry for 8086:a72f.
> > 
> > Note that the one for 8086:a76e has been already added by the commit
> > 627c6db20703 ("PCI/DPC: Quirk PIO log size for Intel Raptor Lake Root
> > Ports").
> 
> Intel folks, what's the long-term resolution of this?  I'm kind of
> tired of adding quirks like this.  So far we have these (not including
> the current patch), dating back to Aug 2022:
> 
>   627c6db20703 ("PCI/DPC: Quirk PIO log size for Intel Raptor Lake Root Ports")
>   3b8803494a06 ("PCI/DPC: Quirk PIO log size for Intel Ice Lake Root Ports")
>   5459c0b70467 ("PCI/DPC: Quirk PIO log size for certain Intel Root Ports")
> 
> I *thought* this problem was caused by BIOS defects that were supposed
> to be fixed, but nothing seems to be happening.

As far as I know it should be fixed already. I just checked my MTLP and PTL
systems (both with integrated TBT PCIe root ports) and I don't see the
message anymore. I don't have RPL system though. This is on reference
hardware and BIOS so it is possible that the fix has not been taken into
the OEM BIOS.