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

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Message-ID: <20260204123702.GO2275908@black.igk.intel.com>
Date: Wed, 4 Feb 2026 13:37:02 +0100
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Jayi Li <lijiayi@...inos.cn>
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

On Wed, Feb 04, 2026 at 10:37:58AM +0800, Jayi Li wrote:
> 
> 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.

Ah okay. I don't have any experience with ASMedia host. What system/laptop
comes with that?

>  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.

I think that's integrated into the SoC, right? So it's a PCIe root port
used for tunneling. What does 'sudo lspci -vv' say?