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

[Avinash Roy <avinash@linux.ibm.com>]

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On 8/6/26 10:56 PM, Bjorn Helgaas wrote:
> 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).

Yes, This is for Spyre card specificchanges. The card requires an explicit warm reset to restore it to the 
proper initialization state.

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