linux-kernel - Re: [PATCH] thunderbolt: Fix PCIe device enumeration with delayed rescan

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Message-ID: <8a4874ef-90d4-4d88-a72d-1efa791a5b9b@kylinos.cn>
Date: Wed, 4 Feb 2026 10:37:58 +0800
From: Jayi Li <lijiayi@...inos.cn>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: "Chia-Lin Kao (AceLan)" <acelan.kao@...onical.com>,
 Andreas Noever <andreas.noever@...il.com>,
 Mika Westerberg <westeri@...nel.org>, Yehezkel Bernat
 <YehezkelShB@...il.com>, linux-usb@...r.kernel.org,
 linux-kernel@...r.kernel.org, Gil Fine <gil.fine@...ux.intel.com>
Subject: Re: [PATCH] thunderbolt: Fix PCIe device enumeration with delayed
 rescan


在 2026/2/3 18:07, Mika Westerberg 写道:
> On Tue, Feb 03, 2026 at 06:00:06PM +0800, Jayi Li wrote:
>>>> I'm not sure if this is relevant to this issue, but sharing just in case.
>>> Thanks for sharing!
>>>
>>> It could be. What device this is?
>> The device is Targus DOCK221.
> Is the host Intel or AMD (well can you share bit more details about the
> topology)? Then if you block runtime PM of the PCIe Downstream Port that
> leads to the TB3 device like:
>
>   # echo on > /sys/bus/pci/devices/DEVICE/power/control
>
> Does it work?

The host is ASMedia.

  ASMedia Host (0-0, domain0)
          |
         └─ Port 3 ──→ Thunderbolt 3 Dock (0-3)

I tried disabling runtime PM by writing 'on' to power/control for the 
downstream port, but it did not work.