linux-stable.git/drivers/thunderbolt/switch.c, branch linux-6.5.y

thunderbolt: Check that lane 1 is in CL0 before enabling lane bonding

2023-10-19T21:11:05+00:00

commit a9fdf5f933a6f2b358fad0194b1287b67f6704b1 upstream.

Marek reported that when BlackMagic UltraStudio device is connected the
kernel repeatedly tries to enable lane bonding without success making
the device non-functional. It looks like the device does not have lane 1
connected at all so even though it is enabled we should not try to bond
the lanes. For this reason check that lane 1 is in fact CL0 (connected,
active) before attempting to bond the lanes.

Reported-by: Marek Šanta 
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217737
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg 
Signed-off-by: Greg Kroah-Hartman

thunderbolt: Add support for enhanced uni-directional TMU mode

2023-06-16T06:53:28+00:00

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

thunderbolt: Announce USB4 v2 connection manager support

2023-06-16T06:53:28+00:00

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

Signed-off-by: Gil Fine 
Signed-off-by: Mika Westerberg

thunderbolt: Add support for USB4 v2 80 Gb/s link

2023-06-16T06:53:27+00:00

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 
Signed-off-by: Mika Westerberg

thunderbolt: Identify USB4 v2 routers

2023-06-16T06:53:27+00:00

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 
Signed-off-by: Mika Westerberg

thunderbolt: Do not touch lane 1 adapter path config space

2023-06-16T06:53:27+00:00

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

thunderbolt: Initialize CL states from the hardware

2023-06-09T09:07:24+00:00

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

thunderbolt: Switch CL states from enum to a bitmask

2023-06-09T09:07:23+00:00

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

thunderbolt: Move CLx support functions into clx.c

2023-06-09T09:07:23+00:00

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

thunderbolt: Introduce tb_switch_downstream_port()

2023-06-09T09:07:22+00:00

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 
Signed-off-by: Mika Westerberg