Re: [RESEND] Re: [PATCH] PCI: dw-rockchip: Skip waiting for link up

Shawn Lin
2025-11-11T03:17:45Z

在 2025/11/11 星期二 10:09, FUKAUMI Naoki 写道:
> On 11/11/25 04:59, Niklas Cassel wrote:

...

>
> Leaving the commit message aside, I'm currently testing with a revert of
> the two patches.
>
> Vanilla v6.18-rc5, CONFIG_PCI_DYNAMIC_OF_NODES=y, revert ec9fd499b9c6,
> revert 0e0b45ab5d77.
>
> It works stably on the ROCK 5A. The link speed is 2Gb/s.
>
> The ROCK 5C is unstable. It initially worked with a link speed of 4Gb/s,
> but eventually started showing kernel oops. The dts files for the 5A and
> 5C are compatible and interchangeable, but even using the 5A's dts on
> the 5C, the operation remains unstable.

The link speed on ROCK 5A is 2Gb/s also means it's downgraded now. Did
ROCK 5A work under the link speed of 4Gb/s before?

In case it's signal integrity relevant, you could enable PCIE_DW_DEBUGFS
and refer to Documentation/ABI/testing/debugfs-dwc-pcie to collect
RASDES info from there.

>
> I plan to thoroughly investigate the ROCK 5C's behavior on v6.13, but
> for now, I believe reverting the two patches is the correct action.
>
> Best regards,
>
> --
> FUKAUMI Naoki
> Radxa Computer (Shenzhen) Co., Ltd.
>
>> Kind regards,
>> Niklas
>>
>
>
>