• Ricardo Neri's avatar
    OMAPDSS: HDMI: Implement DSS driver interface for audio · f3a97491
    Ricardo Neri authored
    Implement the DSS device driver audio support interface in the HDMI
    panel driver and generic driver. The implementation relies on the
    IP-specific functions that are defined at DSS probe time.
    
    A mixed locking strategy is used. The panel's mutex is used when
    the state of the panel is queried as required by the audio functions.
    The audio state is protected using a spinlock as users of DSS HDMI
    audio functionality might start/stop audio while holding a spinlock.
    The mutex and the spinlock are held and released as needed by each
    individual function to protect the panel state and the audio state.
    
    Although the panel's audio_start functions does not check whether
    the panel is active, the audio _ENABLED state can be reached only
    from audio_enable, which does check the state of the panel. Also,
    if the panel is ever disabled, the audio state will transition
    to _DISABLED. Transitions are always protected by the audio lock.
    Signed-off-by: default avatarRicardo Neri <ricardo.neri@ti.com>
    f3a97491
hdmi_panel.c 9.18 KB