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Commit 5f1516d5 authored by John Hsu's avatar John Hsu Committed by Mark Brown
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ASoC: nau8825: disable sinc filter for high THD of ADC 



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: default avatarJohn Hsu <KCHSU0@nuvoton.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2263fddc

sound/soc/codecs/nau8825.c

+2 −1
Original line number Diff line number Diff line
@@ -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 */

sound/soc/codecs/nau8825.h

+2 −0
Original line number Diff line number Diff line
@@ -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