Merge tag 'usb-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB / Thunderbolt updates from Greg KH:
 "Here is the big set of USB and Thunderbolt changes for 6.16-rc1.
  Included in here are the following:

   - USB offload support for audio devices.

     I think this takes the record for the most number of patch series
     (30+) over the longest period of time (2+ years) to get merged
     properly.

     Many props go to Wesley Cheng for seeing this effort through, they
     took a major out-of-tree hacked-up-monstrosity that was created by
     multiple vendors for their specific devices, got it all merged into
     a semi-coherent set of changes, and got all of the different major
     subsystems to agree on how this should be implemented both with
     changes to their code as well as userspace apis, AND wrangled the
     hardware companies into agreeing to go forward with this, despite
     making them all redo work they had already done in their private
     device trees.

     This feature offers major power savings on embedded devices where a
     USB audio stream can continue to flow while the rest of the system
     is sleeping, something that devices running on battery power really
     care about. There are still some more small tweaks left to be done
     here, and those patches are still out for review and arguing among
     the different hardware companies, but this is a major step forward
     and a great example of how to do upstream development well.

   - small number of thunderbolt fixes and updates, things seem to be
     slowing down here (famous last words...)

   - xhci refactors and reworking to try to handle some rough corner
     cases in some hardware implementations where things don't always
     work properly

   - typec driver updates

   - USB3 power management reworking and updates

   - Removal of some old and orphaned UDC gadget drivers that had not
     been used in a very long time, dropping over 11 thousand lines from
     the tree, always a nice thing, making up for the 12k lines added
     for the USB offload feature.

   - lots of little updates and fixes in different drivers

  All of these have been in linux-next for over 2 weeks, the USB offload
  logic has been in there for 8 weeks now, with no reported issues"

* tag 'usb-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (172 commits)
  ALSA: usb-audio: qcom: fix USB_XHCI dependency
  ASoC: qdsp6: fix compile-testing without CONFIG_OF
  usb: misc: onboard_usb_dev: fix build warning for CONFIG_USB_ONBOARD_DEV_USB5744=n
  usb: typec: tipd: fix typo in TPS_STATUS_HIGH_VOLAGE_WARNING macro
  USB: typec: fix const issue in typec_match()
  USB: gadget: udc: fix const issue in gadget_match_driver()
  USB: gadget: fix up const issue with struct usb_function_instance
  USB: serial: pl2303: add new chip PL2303GC-Q20 and PL2303GT-2AB
  USB: serial: bus: fix const issue in usb_serial_device_match()
  usb: usbtmc: Fix timeout value in get_stb
  usb: usbtmc: Fix read_stb function and get_stb ioctl
  ALSA: qc_audio_offload: try to reduce address space confusion
  ALSA: qc_audio_offload: avoid leaking xfer_buf allocation
  ALSA: qc_audio_offload: rename dma/iova/va/cpu/phys variables
  ALSA: usb-audio: qcom: Fix an error handling path in qc_usb_audio_probe()
  usb: misc: onboard_usb_dev: Fix usb5744 initialization sequence
  dt-bindings: usb: ti,usb8041: Add binding for TI USB8044 hub controller
  usb: misc: onboard_usb_dev: Add support for TI TUSB8044 hub
  usb: gadget: lpc32xx_udc: Use USB API functions rather than constants
  usb: gadget: epautoconf: Use USB API functions rather than constants
  ...

1 files changed, 33 insertions, 0 deletions

diff --git a/Documentation/admin-guide/thunderbolt.rst b/Documentation/admin-guide/thunderbolt.rst
index d0502691dfa1..240fee618e06 100644
--- a/Documentation/admin-guide/thunderbolt.rst
+++ b/Documentation/admin-guide/thunderbolt.rst
@@ -296,6 +296,39 @@ information is missing.
 To recover from this mode, one needs to flash a valid NVM image to the
 host controller in the same way it is done in the previous chapter.
 
+Tunneling events
+----------------
+The driver sends ``KOBJ_CHANGE`` events to userspace when there is a
+tunneling change in the ``thunderbolt_domain``. The notification carries
+following environment variables::
+
+  TUNNEL_EVENT=<EVENT>
+  TUNNEL_DETAILS=0:12 <-> 1:20 (USB3)
+
+Possible values for ``<EVENT>`` are:
+
+  activated
+    The tunnel was activated (created).
+
+  changed
+    There is a change in this tunnel. For example bandwidth allocation was
+    changed.
+
+  deactivated
+    The tunnel was torn down.
+
+  low bandwidth
+    The tunnel is not getting optimal bandwidth.
+
+  insufficient bandwidth
+    There is not enough bandwidth for the current tunnel requirements.
+
+The ``TUNNEL_DETAILS`` is only provided if the tunnel is known. For
+example, in case of Firmware Connection Manager this is missing or does
+not provide full tunnel information. In case of Software Connection Manager
+this includes full tunnel details. The format currently matches what the
+driver uses when logging. This may change over time.
+
 Networking over Thunderbolt cable
 ---------------------------------
 Thunderbolt technology allows software communication between two hosts