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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2014-01-03 15:27:52 +0200
committerMark Brown <broonie@linaro.org>2014-01-08 12:48:53 +0000
commit8b3bca2966985f559f9ace1effc98955006f2b05 (patch)
treeb7041006495fffd09daa656d3fb2a7bdba416d39
parent0dc41562a44c9e1012bb810c2a84e81c425867b0 (diff)
ASoC: twl4030: Introduce local ctl register cache
Few registers need to be cached in the codec driver level. These registers should only be written when the path is active to avoid pop noise on the given path. This patch adds an array which covers the range where the sensitive registers are located and uppon loadinf the driver the ctl cache will be initialized. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
-rw-r--r--sound/soc/codecs/twl4030.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index ab2f22299db..f88207712d3 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -150,10 +150,22 @@ struct twl4030_priv {
u8 earpiece_enabled;
u8 predrivel_enabled, predriver_enabled;
u8 carkitl_enabled, carkitr_enabled;
+ u8 ctl_cache[TWL4030_REG_PRECKR_CTL - TWL4030_REG_EAR_CTL + 1];
struct twl4030_codec_data *pdata;
};
+static void tw4030_init_ctl_cache(struct twl4030_priv *twl4030)
+{
+ int i;
+ u8 byte;
+
+ for (i = TWL4030_REG_EAR_CTL; i <= TWL4030_REG_PRECKR_CTL; i++) {
+ twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &byte, i);
+ twl4030->ctl_cache[i - TWL4030_REG_EAR_CTL] = byte;
+ }
+}
+
/*
* read twl4030 register cache
*/
@@ -348,6 +360,9 @@ static void twl4030_init_chip(struct snd_soc_codec *codec)
}
}
+ /* Initialize the local ctl register cache */
+ tw4030_init_ctl_cache(twl4030);
+
/* Refresh APLL_CTL register from HW */
twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &byte,
TWL4030_REG_APLL_CTL);