CODEC_DAC_PRECHARGE_CTRL
val = RKCODEC_READ(sc, CODEC_DAC_PRECHARGE_CTRL);
RKCODEC_WRITE(sc, CODEC_DAC_PRECHARGE_CTRL, val);
val = RKCODEC_READ(sc, CODEC_DAC_PRECHARGE_CTRL);
RKCODEC_WRITE(sc, CODEC_DAC_PRECHARGE_CTRL, val);