[PATCH v2 1/2] PCI/ASPM: Override the ASPM and Clock PM states set by BIOS for devicetree platforms

[Jon Hunter]

On 26/02/2026 11:16, Manivannan Sadhasivam wrote:

...

> I can't certainly know what is going wrong. If controller driver suspend is
> skipped, then ideally the controller and the NVMe device should stay powered ON
> during suspend. But if the platform pulls the plug at the end of suspend
> (firmware, gdsc or some other entity), then all the context would be lost and
> that might explain the failure because both the controller driver and NVMe
> driver would expect the RC and NVMe to be active.
> 
> You can try commenting out the whole PM callbacks:
> 		// .pm = &tegra_pcie_dw_pm_ops
> 
> If the host itself doesn't resume, then it confirms that some other entity is
> pulling the plug (which is common in ARM platforms). In that case, we have to
> let the NVMe driver know about it so that it can shutdown the controller.

For Tegra, we enter a deep low power state known as SC7 on suspend which 
does involve firmware. Nonetheless I tried for fun, but this breaks 
suspend completely.

Jon

-- 
nvpublic