ASoC: fsl_sai: Remove unnecessary FIFO reset in ISR

The FIFO reset drops the words in the FIFO, which may cause
channel swap when SAI module is running, especially when the
DMA speed is low. So it is not good to do FIFO reset in ISR,
then remove the operation.

Fixes: e2681a1bf5ae ("ASoC: fsl_sai: Add isr to deal with error flag")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1660713867-26921-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index d430eec..a7fa6f0 100644 (file)
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -114,11 +114,8 @@ static irqreturn_t fsl_sai_isr(int irq, void *devid)
        if (flags & FSL_SAI_CSR_SEF)
                dev_dbg(dev, "isr: Tx Frame sync error detected\n");
 
-       if (flags & FSL_SAI_CSR_FEF) {
+       if (flags & FSL_SAI_CSR_FEF)
                dev_dbg(dev, "isr: Transmit underrun detected\n");
-               /* FIFO reset for safety */
-               xcsr |= FSL_SAI_CSR_FR;
-       }
 
        if (flags & FSL_SAI_CSR_FWF)
                dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");
@@ -148,11 +145,8 @@ irq_rx:
        if (flags & FSL_SAI_CSR_SEF)
                dev_dbg(dev, "isr: Rx Frame sync error detected\n");
 
-       if (flags & FSL_SAI_CSR_FEF) {
+       if (flags & FSL_SAI_CSR_FEF)
                dev_dbg(dev, "isr: Receive overflow detected\n");
-               /* FIFO reset for safety */
-               xcsr |= FSL_SAI_CSR_FR;
-       }
 
        if (flags & FSL_SAI_CSR_FWF)
                dev_dbg(dev, "isr: Enabled receive FIFO is full\n");