linux-kernel - [PATCH 01/72] ASoC: imx-ssi: Fix occasional AC97 reset failure

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Message-Id: <1366276617-3553-2-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 18 Apr 2013 10:15:46 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	Markus Pargmann <mpa@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 01/72] ASoC: imx-ssi: Fix occasional AC97 reset failure

3.5.7.11 -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>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 sound/soc/fsl/imx-ssi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/fsl/imx-ssi.c b/sound/soc/fsl/imx-ssi.c
index 28dd76c..83300fb 100644
--- a/sound/soc/fsl/imx-ssi.c
+++ b/sound/soc/fsl/imx-ssi.c
@@ -497,6 +497,8 @@ static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
 
 	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(struct snd_ac97 *ac97)
 
 	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 = {
-- 
1.8.1.2

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