UAC3_PD_STATE_D2 748 sound/usb/pcm.c ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2); UAC3_PD_STATE_D2 752 sound/usb/pcm.c ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2); UAC3_PD_STATE_D2 91 sound/usb/power.c case UAC3_PD_STATE_D2: