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

On Tue, Nov 11, 2025 at 06:15:20AM +0100, Christian Zigotzky wrote:

On 11/07/2025 06:06 AM, Christian Zigotzky wrote:

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On 11/05/2025 11:09 PM, Bjorn Helgaas wrote:

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I tested your patch with the RC4 of kernel 6.18 today. Unfortunately

it

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doesn't solve the boot issue.

Thanks for testing that.  I see now why that approach doesn't work:
quirk_disable_aspm_l0s_l1() calls pci_disable_link_state(), which
updates the permissible ASPM link states, but pci_disable_link_state()
only works for devices at the downstream end of a link.  It doesn't
work at all for Root Ports, which are at the upstream end of a link.

Christian, you originally reported that both X5000 and X1000 were
broken.  I suspect X1000 may have been fixed in v6.18-rc3 by
df5192d9bb0e ("PCI/ASPM: Enable only L0s and L1 for devicetree
platforms"), but I would love to have confirmation of that.

Hello Bjorn,

I will enable CONFIG_PCIEASPM and CONFIG_PCIEASPM_DEFAULT for the RC5 of
kernel 6.18 and test it with the X1000.

I tested the RC5 of kernel 6.18 with CONFIG_PCIEASPM and
CONFIG_PCIEASPM_DEFAULT enabled on my X1000 today. Unfortunately the boot
problems are still present.

Thanks.  Can you post a dmesg somewhere so I can see what the relevant
device IDs are?  Can be with any kernel, doesn't have to be v6.18.  We
need the Vendor and Device IDs to add a quirk.