]> git.ipfire.org Git - thirdparty/kernel/stable.git/commit
USB: quirks: ignore remote wake-up on Fibocom L850-GL LTE modem
authorVincent Palatin <vpalatin@chromium.org>
Fri, 19 Mar 2021 12:48:02 +0000 (13:48 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 7 Apr 2021 10:04:21 +0000 (12:04 +0200)
commit7c5ac98ece9ffd79bf879748a5cdc04bc875b028
tree32d14d84bf61fc619c446783b6ff84c6dcb86f85
parent63d8737a59ae58e5c2d5fd640c294e7b5bb1d394
USB: quirks: ignore remote wake-up on Fibocom L850-GL LTE modem

commit 0bd860493f81eb2a46173f6f5e44cc38331c8dbd upstream.

This LTE modem (M.2 card) has a bug in its power management:
there is some kind of race condition for U3 wake-up between the host and
the device. The modem firmware sometimes crashes/locks when both events
happen at the same time and the modem fully drops off the USB bus (and
sometimes re-enumerates, sometimes just gets stuck until the next
reboot).

Tested with the modem wired to the XHCI controller on an AMD 3015Ce
platform. Without the patch, the modem dropped of the USB bus 5 times in
3 days. With the quirk, it stayed connected for a week while the
'runtime_suspended_time' counter incremented as excepted.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Link: https://lore.kernel.org/r/20210319124802.2315195-1-vpalatin@chromium.org
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/quirks.c