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@oss.qualcomm.com>
---
Changes in v3:
- Report USB_LINK_UNKNOWN instead of NATIVE if the DWC3 controller
seems not to support USB4
- Cache the capability of reporting tunneling mode instead of checking
it every single time
- Link to v2: https://patch.msgid.link/20260715-topic-dwc3_tunneling_state-v2-0-026487a08119@oss.qualcomm.com
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@oss.qualcomm.com
---
Konrad Dybcio (4):
usb: xhci: debugfs: Expose the USB3 tunneling ext_cap register value
usb: xhci: Honor PORTSC.TM if valid
usb: xhci: Allow custom op for usb_link_tunnel_mode reporting
usb: dwc3: Notify XHCI core of tunneled status
drivers/usb/dwc3/core.c | 16 ++++++++++++++++
drivers/usb/dwc3/core.h | 18 ++++++++++++++++++
drivers/usb/dwc3/host.c | 12 ++++++++++++
drivers/usb/host/xhci-debugfs.c | 9 +++++++++
drivers/usb/host/xhci-debugfs.h | 2 ++
drivers/usb/host/xhci-ext-caps.h | 4 ++++
drivers/usb/host/xhci-hub.c | 24 +++++++++++++++++++-----
drivers/usb/host/xhci-plat.c | 2 ++
drivers/usb/host/xhci-plat.h | 1 +
drivers/usb/host/xhci-port.h | 3 ++-
drivers/usb/host/xhci.c | 11 ++++++++++-
drivers/usb/host/xhci.h | 6 +++++-
12 files changed, 100 insertions(+), 8 deletions(-)
---
base-commit: 89c07d98716a13454ec3fd9f97689e812cc71bd4
change-id: 20260504-topic-dwc3_tunneling_state-50588c0e1ae3
Best regards,
--
Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>