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>

Program the CMUV (Connection Manager USB4 Version) field for USB4 v2 and
v1 routers according to the spec.

Signed-off-by: Gil Fine <gil.fine@intel.com>
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>

Add a new function usb4_switch_version() that can be used to figure out
the spec version of the router and make tb_switch_is_usb4() to use it as
well. Update the uevent accordingly.

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

It is not required to be implemented at all because USB4 does not use
lane 1 for tunneling except when aggregated with lane 0. For this reason
do not try to read the path config space of USB4 lane 1 adapters.

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

In case the boot firmware enabled any of them, read the currently
configured CL states and update the router structure accordingly.

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

This is more natural and follows the hardware register layout better.
This makes it easier to see which CL states we enable (even though they
should be enabled together). Rename 'clx_mask' to 'clx' everywhere as
this is now always bitmask.

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

There really don't belong to switch.c so move them into their own file.
As we do this rename the functions to match the conventions used
elsewhere in the driver.

No functional changes.

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

Introduce tb_switch_downstream_port() helper function that returns the
downstream port of a parent switch that is connected to the upstream
port of specified switch. From now on, we use it all across the driver
where applicable.

While there fix a whitespace in comment and rename 'downstream' to
'down' to be consistent with the rest of the driver.

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

Mika writes:

thunderbolt: Changes for v6.4 merge window

This includes following Thunderbolt/USB4 changes for the v6.4 merge
window:

  - Refactoring of DROM read code paths
  - Convert to use SI units from units.h
  - A couple of cleanups

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

* tag 'thunderbolt-for-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  thunderbolt: Introduce usb4_port_sb_opcode_err_to_errno() helper
  thunderbolt: Make use of SI units from units.h
  thunderbolt: Get rid of redundant 'else'
  thunderbolt: Refactor DROM reading
  thunderbolt: use `tb_eeprom_get_drom_offset` to discover DROM offset