MLK-24753-1: ASoC: fsl_esai_mix: Using workqueue for mix handler

Previously doing mixing in softirq, the mixing causing too much
time ( period size is 512 sample, the time is about 2.5ms), so
move the mixing to workqueue to reduce irq loading

Use 4 period instead of pingpong buffer for leverage instant loading.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Peng Zhang <peng.zhang_8@nxp.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/sound/soc/fsl/fsl_esai_mix.h b/sound/soc/fsl/fsl_esai_mix.h
index 7d117154b27a..ee69d2daf70c 100644
--- a/sound/soc/fsl/fsl_esai_mix.h
+++ b/sound/soc/fsl/fsl_esai_mix.h
@@ -28,7 +28,11 @@ struct fsl_esai_mix {
 	struct snd_pcm_substream *fe_substream[MAX_CLIENT_NUM];
 	struct fsl_esai_client *client[MAX_CLIENT_NUM];
 	struct snd_dma_buffer dma_buffer;
-	u32 buffer_offset;
+	struct workqueue_struct  *mix_wq;
+	struct work_struct       work;
+	struct snd_pcm_substream *substream;
+	u32 buffer_read_offset;
+	u32 buffer_write_offset;
 	u32 buffer_bytes;
 	u32 period_bytes;
 	u32 period_num;