[PPC] Boot problems after the pci-v6.18-changes

[Lukas Wunner]

[cc += Mani]

On Sat, Oct 11, 2025 at 07:12:49AM +0200, Christian Zigotzky wrote:
> On 09 October 2025 at 07:37 am, Lukas Wunner wrote:
> > On Thu, Oct 09, 2025 at 06:54:58AM +0200, Christian Zigotzky wrote:
> > > On 08 October 2025 at 09:51 pm, Bjorn Helgaas wrote:
> > > > On Wed, Oct 08, 2025 at 06:35:42PM +0200, Christian Zigotzky wrote:
> > > > > Our PPC boards [1] have boot problems since the pci-v6.18-changes. [2]
> > > > > 
> > > > > Without the pci-v6.18-changes, the PPC boards boot without any problems.
> > > > > 
> > > > > Boot log with error messages:
> > > > > https://github.com/user-attachments/files/22782016/Kernel_6.18_with_PCI_changes.log
> > > > > 
> > > > > Further information: https://github.com/chzigotzky/kernels/issues/17
> > > > Do you happen to have a similar log from a recent working kernel,
> > > > e.g., v6.17, that we could compare with?
> > > Thanks for your answer. Here is a similar log from the kernel 6.17.0:
> > > https://github.com/user-attachments/files/22789946/Kernel_6.17.0_Cyrus_Plus_board_P5040.log
> > These lines are added in v6.18:
> > 
> >    pci 0000:01:00.0: ASPM: DT platform, enabling L0s-up L0s-dw L1 ASPM-L1.1 ASPM-L1.2 PCI-PM-L1.1 PCI-PM-L1.2
> >    pci 0000:01:00.0: ASPM: DT platform, enabling ClockPM
> >    pci 0001:01:00.0: ASPM: DT platform, enabling L0s-up L0s-dw L1 ASPM-L1.1 ASPM-L1.2 PCI-PM-L1.1 PCI-PM-L1.2
> >    pci 0001:01:00.0: ASPM: DT platform, enabling ClockPM
> >    pci 0001:03:00.0: ASPM: DT platform, enabling L0s-up L0s-dw L1 ASPM-L1.1 ASPM-L1.2 PCI-PM-L1.1 PCI-PM-L1.2
> >    pci 0001:03:00.0: ASPM: DT platform, enabling ClockPM
> > 
> > Possible candidate:
> > 
> > f3ac2ff14834 ("PCI/ASPM: Enable all ClockPM and ASPM states for devicetree platforms")
> 
> After reverting the commit f3ac2ff14834, the kernel boots without any
> problems.
> 
> f3ac2ff14834 ("PCI/ASPM: Enable all ClockPM and ASPM states for devicetree
> platforms") is the bad commit.

Hi Mani, your commit f3ac2ff14834 is causing a regression on certain
powerpc machines.  Any ideas?

Thanks,

Lukas