This bit will enable 4th order SINC filter. =1, filter will enable; but it consumes higher power. =0, the sinc filter is disable, and it should always keep 0 value to get high THD. Therefor, disable the filter when codec initiation for better performance when recording. Signed-off-by: John Hsu <KCHSU0@xxxxxxxxxxx> --- sound/soc/codecs/nau8825.c | 3 ++- sound/soc/codecs/nau8825.h | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c index 2b89569..efe3a44 100644 --- a/sound/soc/codecs/nau8825.c +++ b/sound/soc/codecs/nau8825.c @@ -1846,7 +1846,8 @@ static void nau8825_init_regs(struct nau8825 *nau8825) * (audible hiss). Set it to something better. */ regmap_update_bits(regmap, NAU8825_REG_ADC_RATE, - NAU8825_ADC_SYNC_DOWN_MASK, NAU8825_ADC_SYNC_DOWN_64); + NAU8825_ADC_SYNC_DOWN_MASK | NAU8825_ADC_SINC4_EN, + NAU8825_ADC_SYNC_DOWN_64); regmap_update_bits(regmap, NAU8825_REG_DAC_CTRL1, NAU8825_DAC_OVERSAMPLE_MASK, NAU8825_DAC_OVERSAMPLE_64); /* Disable DACR/L power */ diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h index 0672a25..5d1704e 100644 --- a/sound/soc/codecs/nau8825.h +++ b/sound/soc/codecs/nau8825.h @@ -269,6 +269,8 @@ #define NAU8825_BIQ_PATH_DAC (1 << NAU8825_BIQ_PATH_SFT) /* ADC_RATE (0x2b) */ +#define NAU8825_ADC_SINC4_SFT 4 +#define NAU8825_ADC_SINC4_EN (1 << NAU8825_ADC_SINC4_SFT) #define NAU8825_ADC_SYNC_DOWN_SFT 0 #define NAU8825_ADC_SYNC_DOWN_MASK 0x3 #define NAU8825_ADC_SYNC_DOWN_32 0 -- 2.6.4 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
