linux-kernel - [PATCH 3.4 79/99] ASoC: imx-ssi: Fix occasional AC97 reset failure

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Message-Id: <20140308010614.123986025@linuxfoundation.org>
Date:	Fri,  7 Mar 2014 17:08:15 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sascha Hauer <s.hauer@...gutronix.de>,
	Markus Pargmann <mpa@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Weng Meiling <wengmeiling.weng@...wei.com>
Subject: [PATCH 3.4 79/99] ASoC: imx-ssi: Fix occasional AC97 reset failure

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sascha Hauer <s.hauer@...gutronix.de>

commit b6e51600f4e983e757b1b6942becaa1ae7d82e67 upstream.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Weng Meiling <wengmeiling.weng@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/imx/imx-ssi.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/soc/imx/imx-ssi.c
+++ b/sound/soc/imx/imx-ssi.c
@@ -497,6 +497,8 @@ static void imx_ssi_ac97_reset(struct sn
 
 	if (imx_ssi->ac97_reset)
 		imx_ssi->ac97_reset(ac97);
+	/* First read sometimes fails, do a dummy read */
+	imx_ssi_ac97_read(ac97, 0);
 }
 
 static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
@@ -505,6 +507,9 @@ static void imx_ssi_ac97_warm_reset(stru
 
 	if (imx_ssi->ac97_warm_reset)
 		imx_ssi->ac97_warm_reset(ac97);
+
+	/* First read sometimes fails, do a dummy read */
+	imx_ssi_ac97_read(ac97, 0);
 }
 
 struct snd_ac97_bus_ops soc_ac97_ops = {


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