ASoC: imx-ssi: Fix occasional AC97 reset failure

commit b6e51600f4e983e757b1b6942becaa1ae7d82e67 upstream.

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

diff --git a/sound/soc/imx/imx-ssi.c b/sound/soc/imx/imx-ssi.c
index 4f81ed456325c044e1dc9f0781de9b4dc4d46310..30afae7baddf444a6ba7fcd53b1b454d6226f10f 100644 (file)
--- 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 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 = {