• Rafael J. Wysocki's avatar
    ACPI: PM: Call pm_set_suspend_via_firmware() during hibernation · bb186901
    Rafael J. Wysocki authored
    On systems with ACPI platform firmware the last stage of hibernation
    is analogous to system suspend to S3 (suspend-to-RAM), so it should
    be handled analogously.  In particular, pm_suspend_via_firmware()
    should return 'true' in that stage to let the callers of it know that
    control will be passed to the platform firmware going forward, so
    pm_set_suspend_via_firmware() needs to be called then in analogy with
    acpi_suspend_begin().
    
    However, the platform hibernation ->begin() callback is invoked
    during the "freeze" transition (before creating a snapshot image of
    system memory) as well as during the "hibernate" transition which is
    the last stage of it and pm_set_suspend_via_firmware() should be
    invoked by that callback in the latter stage only.
    
    In order to implement that redefine the hibernation ->begin()
    callback to take a pm_message_t argument to indicate which stage
    of hibernation is taking place and rework acpi_hibernation_begin()
    and acpi_hibernation_begin_old() to take it into account as needed.
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    bb186901
sleep.c 32.1 KB