linux-kernel - [02/74] ASoC: imx-ssi: Fix occasional AC97 reset failure

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Message-ID: <lsq.1365374742.587931136@decadent.org.uk>
Date:	Sun, 07 Apr 2013 23:45:42 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Mark Brown" <broonie@...nsource.wolfsonmicro.com>,
	"Sascha Hauer" <s.hauer@...gutronix.de>,
	"Markus Pargmann" <mpa@...gutronix.de>
Subject: [02/74] ASoC: imx-ssi: Fix occasional AC97 reset failure

3.2.43-rc1 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>
---
 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
@@ -573,6 +573,8 @@ 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)
@@ -581,6 +583,9 @@ 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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