[PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Keith Busch]

On Thu, May 20, 2021 at 05:40:54PM +0000, Deucher, Alexander wrote:
> It doesn't really have anything to do with PCI.  The PCI link is just a proxy
> for specific AMD platforms.  It's platform firmware behavior we are catering
> to.  This was originally posted as an nvme quirk, but during the review it
> was recommended to move the quirk into PCI because the quirk is not specific
> a particular NVMe device, but rather a set of AMD platforms.  Lots of other
> platforms seems to do similar things in the nvme driver based on ACPI or DMI
> flags, etc.  On our hardware this nvme flag is required for all cezanne and
> renoir platforms.

The quirk was initially presented as specific to the pci root. Does it make
more sense for nvme to recognize the limitation from querying a different
platform component instead of the pci bus?