linux-kernel - [PATCH 3.2 002/131] ASoC: samsung: Correct I2S DAI suspend/resume ops

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Message-ID: <lsq.1410438733.420946282@decadent.org.uk>
Date:	Thu, 11 Sep 2014 13:32:13 +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@...aro.org>,
	"Sylwester Nawrocki" <s.nawrocki@...sung.com>
Subject: [PATCH 3.2 002/131] ASoC: samsung: Correct I2S DAI suspend/resume ops

3.2.63-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Sylwester Nawrocki <s.nawrocki@...sung.com>

commit d3d4e5247b013008a39e4d5f69ce4c60ed57f997 upstream.

We should save/restore relevant I2S registers regardless of
the dai->active flag, otherwise some settings are being lost
after system suspend/resume cycle. E.g. I2S slave mode set only
during dai initialization is not preserved and the device ends
up in master mode after system resume.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/soc/samsung/i2s.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -824,11 +824,9 @@ static int i2s_suspend(struct snd_soc_da
 {
 	struct i2s_dai *i2s = to_info(dai);
 
-	if (dai->active) {
-		i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
-		i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
-		i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
-	}
+	i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
+	i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
+	i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
 
 	return 0;
 }
@@ -837,11 +835,9 @@ static int i2s_resume(struct snd_soc_dai
 {
 	struct i2s_dai *i2s = to_info(dai);
 
-	if (dai->active) {
-		writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
-		writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);
-		writel(i2s->suspend_i2spsr, i2s->addr + I2SPSR);
-	}
+	writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
+	writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);
+	writel(i2s->suspend_i2spsr, i2s->addr + I2SPSR);
 
 	return 0;
 }

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