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ASoC: nau8825: disable sinc filter for high THD of ADC

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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@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
John Hsu 2016-12-02 09:48:58 +08:00 committed by Mark Brown
parent 2263fddcd0
commit 5f1516d52f
2 changed files with 4 additions and 1 deletions
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3
sound/soc/codecs/nau8825.c
View File

@ -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 */

2
sound/soc/codecs/nau8825.h
View File

@ -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