ASoC: fsl_sai: Reset FIFOs after disabling TE/RE

SAI will not clear their FIFOs after disabling TE/RE. Therfore, the driver
should take care the task so as not to let useless data remain in the FIFO.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index c5a0e8af8226..b10dbd835d5c 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -371,10 +371,13 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
 
                 /* Check if the opposite FRDE is also disabled */
                 if (!(tx ? rcsr & FSL_SAI_CSR_FRDE : tcsr & FSL_SAI_CSR_FRDE)) {
+                        /* Disable both directions and reset their FIFOs */
                         regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
-                                           FSL_SAI_CSR_TERE, 0);
+                                           FSL_SAI_CSR_TERE | FSL_SAI_CSR_FR,
+                                           FSL_SAI_CSR_FR);
                         regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
-                                           FSL_SAI_CSR_TERE, 0);
+                                           FSL_SAI_CSR_TERE | FSL_SAI_CSR_FR,
+                                           FSL_SAI_CSR_FR);
                 }
                 break;
         default: