Re: [PATCH v2] PCI: Allow D3 for native Hotplug capable Root Ports on non-x86 platforms

[Konrad Dybcio <konradybcio@gmail.com>]

On 8/12/26 1:22 AM, Bjorn Helgaas wrote:
> On Wed, Jul 29, 2026 at 06:50:05PM +0200, Manivannan Sadhasivam wrote:
>> Commit eb3b5bf1a88d ("PCI: Whitelist native hotplug ports for runtime D3"),
>> prevented native Hotplug capable Root Ports from entering D3 citing issues
>> on old Intel SkyLake Xeon-SP platform.
>>
>> But there is no reason to restrict D3 for native Hotplug capable Root
>> Ports on non-x86 platforms. We recently enabled D3 on non-Hotplug capable
>> Root Ports on non-x86 platforms (specifically for DT platforms) in commit
>> a5fb3ff63287 ("PCI: Allow PCI bridges to go to D3Hot on all non-x86"). So
>> do the same for native Hotplug capable Root Ports as well.
>>
>> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
> 
> Applied to pci/pm for v7.3, thanks!

This breaks system suspend entry (crashes the system) on Qualcomm SC8280XP
CRD.. this SoC is known for fragile PCIe.

It doesn't repro on e.g. the Qualcomm Glymur CRD (2 gens newer), perhaps we
need an explicit opt-out like

if (of_machine_is_compatible("qcom,sc8280xp"))

or some targetted fix inside the qcom driver

Konrad