Re: [PATCH 1/1] PCI: Disable D3cold for Killer BE200-family WiFi on MSI Claw A1M

[sashiko-bot@kernel.org]

> During s2idle the platform removes power from the WiFi slot (D3cold).
> The Killer BE1750 (Intel BE200, 8086:272b) installed in the MSI Claw A1M
> fails to resume from that state: the PCIe link does not retrain
> ("pcieport 0000:00:1c.0: Data Link Layer Link Active not set in
> 100 msec") and every device register reads back as 0xffffffff, so the
> card disappears from the bus and the machine must be power-cycled.
> 
> Keeping the device in D3hot with the link in L1.2 during system sleep
> makes suspend and resume work reliably: the package still reaches >99%
> S0ix residency and the card survives every cycle (verified over multiple
> suspend/resume tests with an RTC-timed wake).
> 
> Disable D3cold for the BE200-family device on this board. This mirrors
> the udev-level workaround distributions already ship for the AX200/AX210
> (8086:2725), which suffers from the same class of problem, and moves it
> into the kernel where it belongs.
> 
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220223
> Signed-off-by: Denis Benato <denis.benato@linux.dev>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261025231813.128649-1-denis.benato@linux.dev?part=1