mmAFMT_AUDIO_SRC_CONTROL
tmp = RREG32(mmAFMT_AUDIO_SRC_CONTROL + dig->afmt->offset);
WREG32(mmAFMT_AUDIO_SRC_CONTROL + dig->afmt->offset, tmp);
WREG32(mmAFMT_AUDIO_SRC_CONTROL + dig->afmt->offset,
WREG32(mmAFMT_AUDIO_SRC_CONTROL + offset,