linux-kernel - [PATCH] ASoC: fsl_ssi: Fix checking of dai format for AC97 mode

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Message-ID: <9f62b701350bbb1857b56ba22bb832d7550b676e.1441041757.git.Adam.Thomson.Opensource@diasemi.com>
Date:	Mon, 31 Aug 2015 18:24:09 +0100
From:	Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Timur Tabi <timur@...i.org>, Nicolin Chen <nicoleotsuka@...il.com>,
	Xiubo Li <Xiubo.Lee@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<support.opensource@...semi.com>
Subject: [PATCH] ASoC: fsl_ssi: Fix checking of dai format for AC97 mode

Current code incorrectly treats dai format for AC97 as bit mask
whereas it's actually an integer value. This causes DAI formats
other than AC97 (e.g. DSP_B) to trigger AC97 related code,
which is incorrect and breaks functionality. This patch fixes
the code to correctly compare values to determine AC97 or not.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
---
 sound/soc/fsl/fsl_ssi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index c0b940e..ee47041 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -249,7 +249,8 @@ MODULE_DEVICE_TABLE(of, fsl_ssi_ids);
 
 static bool fsl_ssi_is_ac97(struct fsl_ssi_private *ssi_private)
 {
-	return !!(ssi_private->dai_fmt & SND_SOC_DAIFMT_AC97);
+	return (ssi_private->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) ==
+		SND_SOC_DAIFMT_AC97;
 }
 
 static bool fsl_ssi_is_i2s_master(struct fsl_ssi_private *ssi_private)
@@ -945,7 +946,7 @@ static int _fsl_ssi_set_dai_fmt(struct device *dev,
 				CCSR_SSI_SCR_TCH_EN);
 	}
 
-	if (fmt & SND_SOC_DAIFMT_AC97)
+	if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_AC97)
 		fsl_ssi_setup_ac97(ssi_private);
 
 	return 0;
-- 
1.9.3

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