From: Karl Beldan <karl.beldan@gmail.com>
Date: Mon, 11 May 2009 21:49:41 +0000 (+0200)
Subject: ASoC: pxa2xx-i2s: Proper initialization
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8c10dc4f54d315ce801dc9ef4018aab8d0d75a7b;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

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>
---

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;
 }