在调通i2s后，发现设备做蓝牙免提时没有声音。后来发现QUIN通路高通竟然没调试过蓝牙免提，这部分代码都没有！经过一番折腾。总算把驱动搞好了。但在实际过程中老是报如下错误：

[ 2018.164783] msm_pcm_routing_prepare: setting idx bit of fe:5, type: 1, be:37

[ 2018.164796] performing fractional resample (not really) for copp rate (48000)afe rate (48000)

[ 2018.169950] msm_pcm_routing_get_voc_sessionid session_id 0x0 QUIN_MI2S Hostless: ASoC: no backend DAIs enabled for QUIN_MI2S Hostless

[ 2018.235510] msm_pcm_routing_dereg_phy_stream:copp:1,idx bit fe:5,type:0,be:5

[ 2018.239869] msm_pcm_routing_dereg_phy_stream:copp:1,idx bit fe:5,type:1,be:37

[ 2018.241730] msm_pcm_routing_close: substream->pcm->id:(Internal BT-SCO Playback)

后来经过一番研究，发现：需要在xml里加上Hostless开关。哎，学艺不精呀。