linux-kernel - [PATCH 4.12 035/196] ASoC: zx-i2s: flip I2S master/slave mode

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Date:   Tue, 25 Jul 2017 12:20:34 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.12 035/196] ASoC: zx-i2s: flip I2S master/slave mode

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

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

From: Shawn Guo <shawn.guo@...aro.org>

commit a205c159f9e2db586a5ea475f4d22fa22e78fed8 upstream.

The SND_SOC_DAIFMT_MASTER bits are defined to specify the master/slave
mode for Codec, not I2S.  So the I2S master/slave mode should be flipped
according to SND_SOC_DAIFMT_MASTER bits.

Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/zte/zx-i2s.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/sound/soc/zte/zx-i2s.c
+++ b/sound/soc/zte/zx-i2s.c
@@ -203,13 +203,15 @@ static int zx_i2s_set_fmt(struct snd_soc
 
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
-		i2s->master = 1;
-		val |= ZX_I2S_TIMING_MAST;
-		break;
-	case SND_SOC_DAIFMT_CBS_CFS:
+		/* Codec is master, and I2S is slave. */
 		i2s->master = 0;
 		val |= ZX_I2S_TIMING_SLAVE;
 		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		/* Codec is slave, and I2S is master. */
+		i2s->master = 1;
+		val |= ZX_I2S_TIMING_MAST;
+		break;
 	default:
 		dev_err(cpu_dai->dev, "Unknown master/slave format\n");
 		return -EINVAL;