On Wed, May 29, 2024 at 03:36:47PM +0300, Mika Westerberg wrote:
> From: Aapo Vienamo <aapo.vienamo@xxxxxxxxxxxxxxx>
>
> The margin debugfs node controls the "Enable Margin Test" field of the
> lane margining operations. This field selects between either low or high
> voltage margin values for voltage margin test or left or right timing
> margin values for timing margin test.
>
> According to the USB4 specification, whether or not the "Enable Margin
> Test" control applies, depends on the values of the "Independent
> High/Low Voltage Margin" or "Independent Left/Right Timing Margin"
> capability fields for voltage and timing margin tests respectively. The
> pre-existing condition enabled the debugfs node also in the case where
> both low/high or left/right margins are returned, which is incorrect.
> This change only enables the debugfs node in question, if the specific
> required capability values are met.
>
> Signed-off-by: Aapo Vienamo <aapo.vienamo@xxxxxxxxxxxxxxx>
> Fixes: d0f1e0c2a699 ("thunderbolt: Add support for receiver lane margining")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Applied to thunderbolt.git/fixes.
