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thunderbolt: debugfs: Fix margin debugfs node creation condition

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commit 985cfe501b upstream.

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@linux.intel.com>
Fixes: d0f1e0c2a6 ("thunderbolt: Add support for receiver lane margining")
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aapo Vienamo 2024-05-24 18:53:17 +03:00 committed by Greg Kroah-Hartman
parent d4121290b4
commit d5ceeb0b6a
1 changed files with 3 additions and 2 deletions
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5
drivers/thunderbolt/debugfs.c
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@ -943,8 +943,9 @@ static void margining_port_init(struct tb_port *port)
debugfs_create_file("run", 0600, dir, port, &margining_run_fops);
debugfs_create_file("results", 0600, dir, port, &margining_results_fops);
debugfs_create_file("test", 0600, dir, port, &margining_test_fops);
if (independent_voltage_margins(usb4) ||
(supports_time(usb4) && independent_time_margins(usb4)))
if (independent_voltage_margins(usb4) == USB4_MARGIN_CAP_0_VOLTAGE_HL ||
(supports_time(usb4) &&
independent_time_margins(usb4) == USB4_MARGIN_CAP_1_TIME_LR))
debugfs_create_file("margin", 0600, dir, port, &margining_margin_fops);
}