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