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

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commit a9fdf5f933 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 <teslan223@gmail.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217737
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mika Westerberg 2023-08-22 16:36:18 +03:00 • committed by Greg Kroah-Hartman

parent 0cf7ee2cc6

commit 5d206a77d4

1 changed files with 7 additions and 0 deletions

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drivers/thunderbolt/switch.c

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