• Aaron Lu's avatar
    libata: handle power transition of ODD · 21334205
    Aaron Lu authored
    When ata port is runtime suspended, it will check if the ODD attched to
    it is a zero power(ZP) capable ODD and if the ZP capable ODD is in zero
    power ready state. And if this is not the case, the highest acpi state
    will be limited to ACPI_STATE_D3_HOT to avoid powering off the ODD. And
    if the ODD can be powered off, runtime wake capability needs to be
    enabled and powered_off flag will be set to let resume code knows that
    the ODD was in powered off state.
    
    And on resume, before it is powered on, if it was powered off during
    suspend, runtime wake capability needs to be disabled. After it is
    recovered, the ODD is considered functional, post power on processing
    like eject tray if the ODD is drawer type is done, and several ZPODD
    related fields will also be reset.
    Signed-off-by: default avatarAaron Lu <aaron.lu@intel.com>
    Acked-by: default avatarTejun Heo <tj@kernel.org>
    Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
    21334205
libata.h 10.6 KB