ASoC: pxa2xx-i2s: Proper initialization

Reset FIFO logic and registers, and make sure REC and RPL functions along
with FIFO service are disabled at probe.

Signed-off-by: Karl Beldan <karl.beldan@mobile-devices.fr>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/sound/soc/pxa/pxa2xx-i2s.c b/sound/soc/pxa/pxa2xx-i2s.c
index 60145770aeba..fce8a2894e2c 100644
--- a/sound/soc/pxa/pxa2xx-i2s.c
+++ b/sound/soc/pxa/pxa2xx-i2s.c
@@ -347,6 +347,19 @@ static int pxa2xx_i2s_probe(struct platform_device *dev)
         if (ret != 0)
                 clk_put(clk_i2s);
 
+        /*
+         * PXA Developer's Manual:
+         * If SACR0[ENB] is toggled in the middle of a normal operation,
+         * the SACR0[RST] bit must also be set and cleared to reset all
+         * I2S controller registers.
+         */
+        SACR0 = SACR0_RST;
+        SACR0 = 0;
+        /* Make sure RPL and REC are disabled */
+        SACR1 = SACR1_DRPL | SACR1_DREC;
+        /* Along with FIFO servicing */
+        SAIMR &= ~(SAIMR_RFS | SAIMR_TFS);
+
         return ret;
 }