[PATCH v2] nvme: put some AMD PCIE downstream NVME device to simple suspend/resume path

[Liang, Prike]

[AMD Public Use]

>
> On Wed, Mar 31, 2021 at 08:48:05PM +0800, Prike Liang wrote:
> > The NVME device pluged in some AMD PCIE root port will resume timeout
> > from s2idle which caused by NVME power CFG lost in the SMU FW restore.
> > This issue can be workaround by using PCIe power set with simple
> > suspend/resume process path instead of APST. In the onwards ASIC will
> > try do the NVME shutdown save and restore in the BIOS and still need
> > PCIe power seting to resume from RTD3 for s2idle.
>
> Looks like this is a generic PCIe-level quirk and should go into the core
> drivers/pci/ quirk table, with NVMe just looking at the quirk flag.
[Prike]  Thanks proposal, put the PCI identify to PCIe quirk out of NVMe seems more modularization but seems may not simplify the logic. Will update the v3 patch according.