Re: [PATCH v3] PCI: Disable ASPM L0s for Realtek RTS525A

[sashiko-bot@kernel.org]

> The Realtek RTS525A PCIe card reader reports an AER Correctable Replay
> Timer Timeout storm when ASPM L0s is enabled on its link.  On an affected
> HP ZBook Power 16 inch G11, the Root Port received tens of millions of
> AER interrupts from the RTS525A even when the rtsx_pci driver was
> blacklisted and the endpoint was not enabled by a driver.
> 
> Testing with OS-native AER control showed that disabling only L0s on the
> RTS525A link stops new AER interrupt and counter growth while leaving L1
> enabled.  Disabling L1, L1 substates, or Clock PM alone did not stop the
> storm.
> 
> Prevent the broken L0s configuration by removing L0s from the RTS525A
> advertised ASPM capability.  This avoids enabling the non-working ASPM
> state instead of masking the resulting AER Replay Timer Timeout reports.
> 
> Signed-off-by: Max Lee <max.lee@canonical.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260706025358.516607-1-max.lee@canonical.com?part=1