• Takashi Iwai's avatar
    ALSA: hda: Refactor display power management · 029d92c2
    Takashi Iwai authored
    The current HD-audio code manages the DRM audio power via too complex
    redirections, and this seems even still unbalanced in a corner case as
    Intel DRM CI has been intermittently reporting.  This patch is a big
    surgery for addressing the complexity and the possible unbalance.
    
    Basically the patch changes the display PM in the following ways:
    
    - Both HD-audio controller and codec drivers call a single helper,
      snd_hdac_display_power().  (Formerly, the display power control from
      a codec was done indirectly via link_power bus ops.)
    
    - snd_hdac_display_power() receives the codec address index.  For
      turning on/off from the controller, pass HDA_CODEC_IDX_CONTROLLER.
    
    - snd_hdac_display_power() doesn't manage refcounts any longer, but
      keeps the power status in bitmap.  If any of controller or codecs is
      turned on, the function updates the DRM power state via get_power()
      or put_power().
    
    Also this refactor allows us more cleanup:
    
    - The link_power bus ops is dropped, so there is no longer indirect
      management, as mentioned in the above.
    
    - hdac_device link_power_control flag is moved to hda_codec
      display_power_control flag, as it's only for HDA legacy.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106525Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    029d92c2
hda_codec.c 107 KB