commit d0f1e0c2a6990922818d6616a48d3d92bb7ddac1
author Mika Westerberg <mika.westerberg@linux.intel.com> Tue Feb 22 19:31:47 2022 +0200
committer Mika Westerberg <mika.westerberg@linux.intel.com> Mon Sep 05 09:02:16 2022 +0300
tree 790dd5ce9dca0cc9a5631208d87041fa8c2d51be
parent b12d2955e732866dd8c73154992332a01e7224ed

thunderbolt: Add support for receiver lane margining

USB4 spec defines standard set of registers to be used for receiver lane
margining. This is useful for I/O interface quality and electrical
robustness validation during manufacturing. Expose receiver lane
margining through new debugfs directory "margining" that is added under
each connected USB4 port. Users can then run the margining by writing to
the exposed attributes under that directory.

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