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    Subject[PATCH 4.19 44/56] USB: quirks: ignore remote wake-up on Fibocom L850-GL LTE modem
    Date
    From: Vincent Palatin <vpalatin@chromium.org>

    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 | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/usb/core/quirks.c
    +++ b/drivers/usb/core/quirks.c
    @@ -498,6 +498,10 @@ static const struct usb_device_id usb_qu
    /* DJI CineSSD */
    { USB_DEVICE(0x2ca3, 0x0031), .driver_info = USB_QUIRK_NO_LPM },

    + /* Fibocom L850-GL LTE Modem */
    + { USB_DEVICE(0x2cb7, 0x0007), .driver_info =
    + USB_QUIRK_IGNORE_REMOTE_WAKEUP },
    +
    /* INTEL VALUE SSD */
    { USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },


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