From 4873867e5f2bd90faad861dd94865099fc3140f3 Mon Sep 17 00:00:00 2001
From: Yitian Bu <buyitian@gmail.com>
Date: Fri, 2 Oct 2015 15:18:41 +0800
Subject: ASoC: dwc: correct irq clear method

From: Yitian Bu <buyitian@gmail.com>

commit 4873867e5f2bd90faad861dd94865099fc3140f3 upstream.

from Designware I2S datasheet, tx/rx XRUN irq is cleared by
reading register TOR/ROR, rather than by writing into them.

Signed-off-by: Yitian Bu <yitian.bu@tangramtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/dwc/designware_i2s.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -100,10 +100,10 @@ static inline void i2s_clear_irqs(struct
 
 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		for (i = 0; i < 4; i++)
-			i2s_write_reg(dev->i2s_base, TOR(i), 0);
+			i2s_read_reg(dev->i2s_base, TOR(i));
 	} else {
 		for (i = 0; i < 4; i++)
-			i2s_write_reg(dev->i2s_base, ROR(i), 0);
+			i2s_read_reg(dev->i2s_base, ROR(i));
 	}
 }