linux-kernel - [PATCH 3.18 47/92] ASoC: tlv320aic3x: Mark the RESET register as volatile

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Message-Id: <20170809202157.424832265@linuxfoundation.org>
Date:   Wed,  9 Aug 2017 13:37:15 -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, Peter Ujfalusi <peter.ujfalusi@...com>,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 3.18 47/92] ASoC: tlv320aic3x: Mark the RESET register as volatile

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

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

From: Peter Ujfalusi <peter.ujfalusi@...com>


[ Upstream commit 63c3194b82530bd71fd49db84eb7ab656b8d404a ]

The RESET register only have one self clearing bit and it should not be
cached. If it is cached, when we sync the registers back to the chip we
will initiate a software reset as well, which is not desirable.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@...mer.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/codecs/tlv320aic3x.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -122,6 +122,16 @@ static const struct reg_default aic3x_re
 	{ 108, 0x00 }, { 109, 0x00 },
 };
 
+static bool aic3x_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AIC3X_RESET:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static const struct regmap_config aic3x_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -129,6 +139,9 @@ static const struct regmap_config aic3x_
 	.max_register = DAC_ICC_ADJ,
 	.reg_defaults = aic3x_reg,
 	.num_reg_defaults = ARRAY_SIZE(aic3x_reg),
+
+	.volatile_reg = aic3x_volatile_reg,
+
 	.cache_type = REGCACHE_RBTREE,
 };