• Alexander Usyskin's avatar
    mei: always use domain runtime pm callbacks. · b42dc063
    Alexander Usyskin authored
    This patch fixes a regression caused by the new changes
    in the "run wake" handlers.
    The mei devices that support D0i3 are no longer receiving an interrupt
    after entering runtime suspend state and will stall.
    pci_dev_run_wake function now returns "true" for some devices
    (including mei) for which it used to return "false",
    arguably incorrectly as "run wake" used to mean that
    wakeup signals can be generated for a device in
    the working state of the system, so it could not be enabled
    or disabled before too.
    MEI maps runtime suspend/resume to its own defined
    power gating (PG) states, (D0i3 or other depending on generation),
    hence we need to go around the native PCI runtime service which
    eventually brings the device into D3cold/hot state,
    but the mei devices cannot wake up from D3 unlike from D0i3/PG state,
    which keeps irq running.
    To get around PCI device native runtime pm,
    MEI uses runtime pm domain handlers which take precedence.
    Cc: <stable@vger.kernel.org> #4.13+
    Signed-off-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
    Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
    Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
pci-txe.c 9.32 KB