• Dylan Reid's avatar
    ALSA: hda - Handle open while transitioning to D3. · b4a91cf0
    Dylan Reid authored
    This addresses an issue encountered when a pcm is opened while
    transitioning to low power state (codec->power_on == 1 &&
    codec->power_transition == -1).  Add snd_pcm_power_up_d3wait to
    hda_codec.  This function is used to power up from azx_open as opposed
    to snd_hda_power_up used from codec_exec_verb. When powering up from
    azx_open, wait for pending power downs to complete, avoiding the power
    up continuing in parallel with the power down on the work queue.
    
    The specific issue seen was with the CS4210 codec, it powers off the ADC
    and DAC nid in its suspend handler.  If it is re-opened before the
    ~100ms power down process completes, the ADC and DAC nid are initialized
    while powered down and audio is lost until another suspend/resume cycle.
    Signed-off-by: default avatarDylan Reid <dgreid@chromium.org>
    Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    b4a91cf0
hda_codec.c 137 KB