PCM_SERIAL_LOOPBACK_MASK  850 sound/soc/mediatek/mt6797/mt6797-reg.h #define PCM_SERIAL_LOOPBACK_MASK                            0x1
PCM_SERIAL_LOOPBACK_MASK  865 sound/soc/mediatek/mt8183/mt8183-reg.h #define PCM_SERIAL_LOOPBACK_MASK                      0x1