PCM_BUFFER_LOOPBACK_MASK  844 sound/soc/mediatek/mt6797/mt6797-reg.h #define PCM_BUFFER_LOOPBACK_MASK                            0x1
PCM_BUFFER_LOOPBACK_MASK  859 sound/soc/mediatek/mt8183/mt8183-reg.h #define PCM_BUFFER_LOOPBACK_MASK                      0x1