[PATCH v2 0/4] PCI: Introduce pci_suspend_retains_context() API

[Manivannan Sadhasivam]

On Sat, May 23, 2026 at 12:04:02AM +0800, Hans Zhang wrote:
> Hi Mani,
> 
> We previously discussed a patch. I wonder if you have any memory of it. I'm
> not sure if it can solve my problem. As shown below:
> 
> https://lore.kernel.org/linux-pci/z4bq25pr35cklwoodz34pnfaopfrtbjwhc6gvbhbsvnwblhxia@frmtb3t3m4nk/
> 

This series won't address your issue as it workarounds PCIe controller issue in
waking from L1ss.

But below patch which got merged for v7.2 might help you:
https://lore.kernel.org/all/20251231162126.7728-1-manivannan.sadhasivam@oss.qualcomm.com/

I'm not sure if your platform firmware uses PSCI for S2R (Suspend To RAM) or
not. If PSCI is used, above patch will turn off NVMe during S2R. If not using
PSCI and some other firmware mechanism, then the kernel driver interacting with
the firmware should call pm_set_{suspend/resume}_via_firmware() from the S2R
suspend ops as like the above patch to allow NVMe driver to turn off the
controller during S2R.

- Mani

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