Re: [PATCH v2 0/3] PCI: Notify PCI drivers about powerdown during suspend

[Rafael J. Wysocki]

On Wed, May 18, 2022 at 3:19 PM Manivannan Sadhasivam
<manivannan.sadhasivam@xxxxxxxxxx> wrote:
>
> Hi,
>
> This series adds support for notifying the PCI drivers like NVMe about the
> transition of PCI devices into powerdown mode during system suspend.

What kind of system suspend are you referring to?  Suspend-to-idle or
suspend-to-RAM?

For suspend-to-RAM this series should not be necessary at all, because
drivers cannot assume that the state of devices will be preserved
anyway in this case.

For suspend-to-idle, drivers can expect the preservation of the device
state, so perhaps the firmware should be prevented from powering them
off in the suspend-to-idle path instead.