ASoC: Davinci: McASP: Flush the FIFO before enabling

FIFO should be flushed before it is enabled for the first time.
This fixes the I/O errors reported by the ASoC core on a fresh boot

Signed-off-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 95441bf..ce5e5cd 100644 (file)
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -380,14 +380,20 @@ static void mcasp_start_tx(struct davinci_audio_dev *dev)
 static void davinci_mcasp_start(struct davinci_audio_dev *dev, int stream)
 {
        if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
-               if (dev->txnumevt)      /* enable FIFO */
+               if (dev->txnumevt) {    /* enable FIFO */
+                       mcasp_clr_bits(dev->base + DAVINCI_MCASP_WFIFOCTL,
+                                                               FIFO_ENABLE);
                        mcasp_set_bits(dev->base + DAVINCI_MCASP_WFIFOCTL,
                                                                FIFO_ENABLE);
+               }
                mcasp_start_tx(dev);
        } else {
-               if (dev->rxnumevt)      /* enable FIFO */
+               if (dev->rxnumevt) {    /* enable FIFO */
+                       mcasp_clr_bits(dev->base + DAVINCI_MCASP_RFIFOCTL,
+                                                               FIFO_ENABLE);
                        mcasp_set_bits(dev->base + DAVINCI_MCASP_RFIFOCTL,
                                                                FIFO_ENABLE);
+               }
                mcasp_start_rx(dev);
        }
 }