Re: [PATCH] PCI: quirks: Add warm reset quirk for IBM Spyre accelerator

[Bjorn Helgaas <helgaas@kernel.org>]

On Thu, Aug 06, 2026 at 10:20:02PM +0530, Shivaprasad G Bhat wrote:
> On 8/5/26 10:48 PM, Bjorn Helgaas wrote:
> > On Wed, Aug 05, 2026 at 06:21:32PM +0530, Avinash Roy wrote:
> > > From: Shivaprasad G Bhat <sbhat@linux.ibm.com>
> > > 
> > > The IBM Spyre accelerator (PCI ID 1014:06a7) requires a dedicated warm
> > > reset method for reliable EEH recovery on pSeries/ppc64 platforms.
> > > 
> > > FLR alone is insufficient because it does not re-initialize the Spyre
> > > firmware state machine. On ppc64 with EEH enabled,
> > > pcibios_set_pcie_reset_state() is overridden in
> > > arch/powerpc/kernel/eeh.c to drive the platform-level PERST# signal via
> > > EEH PE operations, which is the correct mechanism for full device
> > > recovery after an EEH event.
> > 
> > This makes it sound like this mechanism is needed for EEH recovery for
> > *all* devices, not just Spyre.  If that's the case it sounds like we
> > need more than just a Spyre-specific quirk.
> 
> Now I re-read it, The second statement needs to be re-worded. It does sound
> like its true for all devices. Quirk is only for the Spyre card.

So I guess this is related to some Spyre erratum?  Per spec, FLR is
supposed to "set all Function-specific state machines to their
initialization values" (PCIe r7.0, sec 6.6.2).