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>

Intel Barlow Ridge discrete USB4 controller has larger NOR Flash, hence
increase NVM_MAX_SIZE to support it.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Move constants related to NVM into nvm.c to make the code cleaner. Use a
separate constant for USB4_DATA_DWORDS in usb4.c.

No functional changes.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Intel Barlow Ridge discrete USB4 host router has the same limitation as
the previous generations so make sure the USB3 bandwidth limitation
quirk is applied to Barlow Ridge too.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Intel Barlow Ridge is the first USB4 v2 controller from Intel. The
controller exposes standard USB4 PCI class ID in typical configurations,
however there is a way to configure it so that it uses a special class
ID to allow using s different driver than the Windows inbox one. For
this reason add the Barlow Ridge PCI ID to the Linux driver too so that
the driver can attach regardless of the class ID.
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

For USB4 v2 routers, the PCIe adapter capability length is longer.
Display the correct capability length in the debugfs register dump.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

For USB4 v2 routers, the DisplayPort IN adapter capability length is
longer. Display the correct capability length in the debugfs register
dump.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

For USB4 v2 routers, the adapters's TMU capability has two additional
double words. Include them in the debugfs register dump.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

USB4 v2 spec introduces modified encapsulation of PCIe TLP and DLLP
packets. This improves the PCIe tunneled traffic usage by reducing
overhead. Enable this if both sides of the link support it.
Signed-off-by: Gil Fine <gil.fine@intel.com>
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 added a bit that can be used to reset the host router so we use
this to trigger reset when the driver probes. This will reset the
already connected topology as well but doing this simplifies things a
lot if for instance the link is already set to asymmetric. We also add
a module parameter to prevent this in case of problems.

While there rename the REG_HOP_COUNT to REG_CAPS to match the USB4 spec
naming better.
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>

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>

This is also something not always updated after the DROM contents itself
so issue warning but continue parsing it as we do for pre-USB4 DROMs
too.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

When USB4 port is in offline mode (this mean there is no device
attached) we want to keep the sideband up to make it possible to
communicate with the retimers. In the same way there is no need to
enable sideband transactions when the USB4 port is not offline as they
are already up.

For this reason make the enabling/disabling depend on the USB4 port
offline status.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Once retimer NVM authentication is started, sending UNSET_INBOUND_SBTX
will fail so avoid doing that. Only send it when we are writing an image
with not authentication or when the authentication failed early.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

According to the USB4 retimer guide the correct order is immediately
after sending ENUMERATE_RETIMERS so update the code to follow this.
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>

This allows us to disable all CL states temporarily when running lane
margining and then return back the previously enabled states.
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 makes it easier to spot from the logs and follows what we do with
the TMU code already. We also log enabling/disabling CL states using the
tb_sw_dbg() instead of tb_port_dbg().
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Following what we do with other messages in this file. No functional
changes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

There is really no need to call any of the CLx functions in the TMU code
so remove all these checks. This makes the TMU enable/disable flows
easier to follow as well.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Currently tb_switch_clx_enable() enables CL states only for the first
depth router. This is something we may want to change in the future and
in addition it is not visible from the calling path at all. For this
reason do the check in the tb.c so it is immediately visible that we
only do this for the first depth router. Fix the kernel-docs
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>

This avoids some duplication and makes the flow slightly easier to
understand. Also follows what we do in tb_enable_tmu().
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

No need to have separate functions for these so fold them into
tb_switch_clx_enable() and tb_switch_clx_disable() accordingly.

No functional changes.
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>

Instead of at enable time we can do this already in
tb_switch_tmu_configure().
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

This makes the code easier to follow. No functional changes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

There is no need to duplicate the code the enables TMU. Also update the
comment to better explain why we do this in the first place.

No functional changes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

This is better to be part of the software connection manager flows in
tb.c. Also name the new function tb_increase_tmu_accuracy() to match
what it actually does.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Now this is split into two with one having a misleading name
(tb_switch_tmu_unidirectional_enable()).

Make this easier to read, rename and consolidate the two functions into
one with name that explains what it actually does. Use the two constants
as well that were added but never used to make it clear which bits are
being set.

No functional changes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

There is no point passing it as we already have a field for that. While
there clean up the kernel-doc of things that do not really belong to the
API documentation (these can be figured out from the spec itself).

No functional changes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Drop extra empty line and get rid of the '__' in function names. No
functional changes.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

In the same way we did for the routers add a function that returns the
parent routers downstream facing port for XDomain devices.
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>

We need Thunderbolt/USB4 fixes here as well.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>