When handling DisplayPort bandwidth request tb_switch_find_by_route() is
called and it returns a router structure with reference count increased.
In order to avoid resource leak call tb_switch_put() when finished.

Fixes: 6ce3563520be ("thunderbolt: Add support for DisplayPort bandwidth allocation mode")
Cc: stable@vger.kernel.org
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Mika writes:

thunderbolt: Changes for v6.6 merge window

This includes following Thunderbolt/USB4 changes for the v6.6 merge
window:

  - Replace broken mailing list address in the ABI document
  - Small improvements.

All these have been in linux-next with no reported issues.

* tag 'thunderbolt-for-v6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  Documentation/ABI: thunderbolt: Replace 01.org in contact
  thunderbolt: Check Intel vendor ID in tb_switch_get_generation()
  thunderbolt: Log a warning if device links are not found
  thunderbolt: Set variable tmu_params storage class specifier to static

The software connection manager needs the device links in order to
establish the tunnels before the native protocols so log a warning if
they are not found.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

The memory allocated in tb_queue_dp_bandwidth_request() needs to be
released once the request is handled to avoid leaking it.

Fixes: 6ce3563520be ("thunderbolt: Add support for DisplayPort bandwidth allocation mode")
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Make sure the DisplayPort bandwidth allocation mode function names are
consistent with the existing ones, such as USB3.

No functional changes.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

For USB4 v2 routers we can also enable CL2 which allows better power
savings and thermal management than CL0s and CL1.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

This is new TMU mode introduced with the USB4 v2. This mode is simpler
than the existing ones and allows all CL states as well. Enable this for
all links where both side routers are v2 and keep the existing
functionality for the v1 and earlier links.

Currently only support the MedRes rate. We can add the HiFi rate later
too if it turns out to be useful.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

USB4 v2 spec adds a bunch of new notifications that the connection
manager can use instead of polling. While we do not use these yet we
need to ack the ones routers expect to be acked.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

USB4 v2 bumps the per-lane speed up to 40 Gb/s. Also the lanes are
always bonded which gives 80 Gb/s symmetric link (and 120/40 Gb/s
asymmetric). This updates the speed and width of routers and XDomain
connections to support the Gen 4 link. For now we keep the link as is
even if it is already asymmetric.

While there make tb_port_set_link_width() static.

Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Tunnels between hosts should not have CL states enabled because
otherwise they might enter a low power state without the other end
noticing which causes packets to be lost. For this reason disable all
CL states upon first DMA tunnel creation. Once the last DMA tunnel is
torn down we try to re-enable them.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>