• Len Brown's avatar
    ACPI: cpuidle: port idle timer suspend/resume workaround to cpuidle · e196441b
    Len Brown authored
    Some timers stop during C2 and C3, and so there are various
    generations of timer broadcast workarounds to deal with that.
    But that (already complex) code gets confused during suspend.
    
    As it is unlikely that deep C-states would save much power
    during the actual suspend/resume process anyway, deep C-states
    were disabled via the addition of .suspend/.resume hooks
    in to the ACPI processor driver.
    
    Here that workaround is ported to the cpuidle version of
    the ACPI idle loop.  Technically, ACPI could un-register
    itself from cpuidle on .suspend, but that code path
    is currently quite cumbersome.  So instead,
    we simply invoke C1 from the C2 and C3 handlers
    for the duration of .suspend/.resume.
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    e196441b
processor_idle.c 45.4 KB