xhci: Fix repeated xhci wake after suspend due to uncleared internal wake state

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commit d26c00e727 upstream.

If port terminations are detected in suspend, but link never reaches U0
then xHCI may have an internal uncleared wake state that will cause an
immediate wake after suspend.

This wake state is normally cleared when driver clears the PORT_CSC bit,
which is set after a device is enabled and in U0.

Write 1 to clear PORT_CSC for ports that don't have anything connected
when suspending. This makes sure any pending internal wake states in
xHCI are cleared.

Cc: stable@vger.kernel.org
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210311115353.2137560-5-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Mathias Nyman 2021-03-11 13:53:53 +02:00 • committed by Greg Kroah-Hartman

parent 209b3ff98d

commit fc411ca43b

1 changed files with 30 additions and 32 deletions

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62

drivers/usb/host/xhci.c

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