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authorJohn Hsu <KCHSU0@nuvoton.com>2016-12-02 09:48:58 +0800
committerMark Brown <broonie@kernel.org>2016-12-06 14:35:13 +0000
commit5f1516d52f9287a94dc3b9d57c370ed01802a911 (patch)
tree2e3436a473477e670ea9cfdefb91dcbf5b222538 /sound
parent2263fddcd0ba9d8e75a90b1359f92d3b9d0b78b3 (diff)
downloadlinux-5f1516d52f9287a94dc3b9d57c370ed01802a911.tar.bz2
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: John Hsu <KCHSU0@nuvoton.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/nau8825.c3
-rw-r--r--sound/soc/codecs/nau8825.h2
2 files changed, 4 insertions, 1 deletions
diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index 2b89569333a1..efe3a44658d5 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 0672a25617b9..5d1704e73241 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