From 8c10dc4f54d315ce801dc9ef4018aab8d0d75a7b Mon Sep 17 00:00:00 2001 From: Karl Beldan Date: Mon, 11 May 2009 23:49:41 +0200 Subject: [PATCH] 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 Signed-off-by: Mark Brown --- sound/soc/pxa/pxa2xx-i2s.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) 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; } -- 2.20.1