Re: [PATCH v2 0/4] DWC3 link tunneling state reporting

[Konrad Dybcio]

On 7/15/26 2:29 PM, 'Konrad Dybcio' via USB4 - Upstream wrote:
> Currently, retrieving the tunneled/native state of a running port is
> only possible on Intel XHCI hosts. This series extends that to CIO-
> capable DWC31 controllers (see [1]).
> 
> Note that this patchset only results in the correct udev->tunnel_mode
> value being assigned. Creating the device links (which requires this
> information) between the USB4 router and the USB3 controller does not
> currently take place on DT-based platforms, but that will be amended
> in a follow-up patchset.
> 
> Tested on a Qualcomm X1E80100 CRD board, with a (currently) out-of-tree
> set of drivers.
> 
> [1] I'm not entirely sure about the DWC version range (particularly
>     wrt DWC32 and newer), so I limited it to a reasonable subset. I'll
>     happily amend that.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> ---
> Changes in v2:
> - Add handling for XHCI v1.2's USB3 tunneling and PORTSC.TM for
>   platforms that advertise it (!!! UNTESTED !!!, I have no access to
>   HW that exposes this)
> - Prefer the aforementioned cap over custom implementations
> - Bail out of the DWC3-specific check if `usb4-host-interface` device
>   property is absent - hence this now depends on:
>   https://github.com/devicetree-org/dt-schema/pull/196
> 
> - Link to v1: https://patch.msgid.link/20260505-topic-dwc3_tunneling_state-v1-0-4aaa6c3c14cb@xxxxxxxxxxxxxxxx

+Cc Sven sorry, I forgot to include you..

Konrad