Re: [PATCH v18 2/2] PCI: Add a quirk for AMD PCIe root ports w/ USB4 controllers

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On Tue, Sep 12, 2023 at 11:43:53PM -0500, Mario Limonciello wrote:
> On 9/12/2023 23:25, Lukas Wunner wrote:
> > There's already PCI_DEV_FLAGS_NO_D3, would it be possible to just
> > reuse that instead of adding another codepath for D3 quirks?
> > 
> The root port can handle D3 (including wakeup) at runtime fine.
> Issue occurs only during s2idle w/ hardware sleep.

I see.

If this only affects system sleep, not runtime PM, what you can do is
define a DECLARE_PCI_FIXUP_SUSPEND_LATE() which calls pci_d3cold_disable()
and also define a DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY() which calls

And I think you can make those calls conditional on pm_suspend_no_platform()
to constrain to s2idle.

User space should still be able to influence runtime PM via the
d3cold_allowed flag (unless I'm missing something).



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