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

[Mika Westerberg]

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?