From 8b3bca2966985f559f9ace1effc98955006f2b05 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Fri, 3 Jan 2014 15:27:52 +0200 Subject: 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 Signed-off-by: Mark Brown --- sound/soc/codecs/twl4030.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'sound/soc/codecs') 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); -- cgit v1.2.3-70-g09d2