Re: [External] : [PATCH v2 1/3] PCI: Always lift 2.5GT/s restriction in PCIe failed link retraining

[ALOK TIWARI]

On 12/9/2025 12:54 AM, Maciej W. Rozycki wrote:
> Discard Vendor:Device ID matching in the PCIe failed link retraining
> quirk and ignore the link status for the removal of the 2.5GT/s speed
> clamp, whether applied by the quirk itself or the firmware earlier on.
> Revert to the original target link speed if this final link retraining
> has failed.
>
> This is so that link training noise in hot-plug scenarios does not make
> a link remain clamped to the 2.5GT/s speed where an event race has led
> the quirk to apply the speed clamp for one device, only to leave it in
> place for a subsequent device to be plugged in.
>
> Refer to the Link Capabilities register directly for the maximum link
> speed determination so as to streamline backporting.
>
> Fixes: a89c82249c37 ("PCI: Work around PCIe link training failures")
> Tested-by: Alok Tiwari<alok.a.tiwari@xxxxxxxxxx>
> Signed-off-by: Maciej W. Rozycki<macro@xxxxxxxxxxx>
> Cc:<stable@xxxxxxxxxxxxxxx> # v6.5+

Tested-by: Alok Tiwari <alok.a.tiwari@xxxxxxxxxx>

Tested with LTS 6.18.

Thanks,
Alok