linux-kernel - [22/80] ASoC: wm8753: Skip noop reconfiguration of DAI mode

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Date:	Wed, 07 Dec 2011 08:06:42 -0800
From:	Greg KH <gregkh@...e.de>
To:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Cc:	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<alan@...rguk.ukuu.org.uk>,
	Timo Juhani Lindfors <timo.lindfors@....fi>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [22/80] ASoC: wm8753: Skip noop reconfiguration of DAI mode

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

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

From: Timo Juhani Lindfors <timo.lindfors@....fi>

commit 2391a0e06789a3f1718dee30b282562f7ed28c87 upstream.

This patch makes it possible to set DAI mode to its currently applied
value even if codec is active. This is necessary to allow

aplay -t raw -r 44100 -f S16_LE -c 2 < /dev/urandom &
alsactl store -f backup.state
alsactl restore -f backup.state

to work without returning errors. This patch is based on a patch sent
by Klaus Kurzmann <mok@...xnetz.de>.

Signed-off-by: Timo Juhani Lindfors <timo.lindfors@....fi>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/soc/codecs/wm8753.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/sound/soc/codecs/wm8753.c
+++ b/sound/soc/codecs/wm8753.c
@@ -189,6 +189,9 @@ static int wm8753_set_dai(struct snd_kco
 	struct wm8753_priv *wm8753 = snd_soc_codec_get_drvdata(codec);
 	u16 ioctl;
 
+	if (wm8753->dai_func == ucontrol->value.integer.value[0])
+		return 0;
+
 	if (codec->active)
 		return -EBUSY;
 


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