linux-kernel - [PATCH 3.16.y-ckt 160/216] ASoC: pcm512x: Trigger auto-increment of register addresses on i2c

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Message-Id: <1421087394-2712-48-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 12 Jan 2015 18:28:58 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Peter Rosin <peda@...ntia.se>, Mark Brown <broonie@...nel.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 160/216] ASoC: pcm512x: Trigger auto-increment of register addresses on i2c

3.16.7-ckt4 -stable review patch.  If anyone has any objections, please let me know.

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

From: Peter Rosin <peda@...ntia.se>

commit 681a19560378213a193c424881b2180a783b81ae upstream.

When the codec is connected using i2c, it will only auto-increment
register addresses if msb (0x80) of the register address byte is set.

[Fixes cache sync if multiple adjacent registers are updated -- broonie]

Signed-off-by: Peter Rosin <peda@...ntia.se>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 sound/soc/codecs/pcm512x-i2c.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/pcm512x-i2c.c b/sound/soc/codecs/pcm512x-i2c.c
index 4d62230bd378..d0547fa275fc 100644
--- a/sound/soc/codecs/pcm512x-i2c.c
+++ b/sound/soc/codecs/pcm512x-i2c.c
@@ -24,8 +24,13 @@ static int pcm512x_i2c_probe(struct i2c_client *i2c,
 			     const struct i2c_device_id *id)
 {
 	struct regmap *regmap;
+	struct regmap_config config = pcm512x_regmap;
 
-	regmap = devm_regmap_init_i2c(i2c, &pcm512x_regmap);
+	/* msb needs to be set to enable auto-increment of addresses */
+	config.read_flag_mask = 0x80;
+	config.write_flag_mask = 0x80;
+
+	regmap = devm_regmap_init_i2c(i2c, &config);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
-- 
2.1.4

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