[PATCH 3.18 023/150] ASoC: pcm512x: Trigger auto-increment of register addresses on i2c
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2015-01-14 08:50:08
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3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peter Rosin <redacted> 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 <redacted> Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- sound/soc/codecs/pcm512x-i2c.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- 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_ 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);