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>

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>

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>

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>

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

The usb4_port_sb_opcode_err_to_errno() converts from USB4 error codes
to the Linux errno space. In particular, this makes the intention
of the repeating usb4_port_retimer_read() call in the
usb4_port_retimer_nvm_authenticate_status() clearer.

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

In a couple of places it seems reasonable to use MEGA intead
of explicit number. It makes code more readable and robust.

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

In the snippets like the following

	if (...)
		return / goto / break / continue ...;
	else
		...

the 'else' is redundant. Get rid of it.

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

When tunneling aggregated USB3 (20 Gb/s) the bandwidth values that are
programmed to the ADP_USB3_CS_2 go higher than 4096 and that does not
fit anymore to the 12-bit field. Fix this by scaling the value using
the scale field accordingly.

Fixes: 3b1d8d577ca8 ("thunderbolt: Implement USB3 bandwidth negotiation routines")
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>