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ASoC: nau8540: PGA short to ground

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Change channel PGA input mode selection for better recording quality.
The patch shorts the inputs to ground with 12kOhm differentially
terminated.

Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
John Hsu 2017-11-07 15:23:18 +08:00 committed by Mark Brown
parent e4d0db60e8
commit 14323ff8c2
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GPG key ID: 24D68B725D5487D0
2 changed files with 19 additions and 0 deletions
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7
sound/soc/codecs/nau8540.c
View file

@ -730,6 +730,13 @@ static void nau8540_init_regs(struct nau8540 *nau8540)
regmap_update_bits(regmap, NAU8540_REG_ADC_SAMPLE_RATE,
NAU8540_CH_SYNC | NAU8540_ADC_OSR_MASK,
NAU8540_CH_SYNC | NAU8540_ADC_OSR_64);
/* PGA input mode selection */
regmap_update_bits(regmap, NAU8540_REG_FEPGA1,
NAU8540_FEPGA1_MODCH2_SHT | NAU8540_FEPGA1_MODCH1_SHT,
NAU8540_FEPGA1_MODCH2_SHT | NAU8540_FEPGA1_MODCH1_SHT);
regmap_update_bits(regmap, NAU8540_REG_FEPGA2,
NAU8540_FEPGA2_MODCH4_SHT | NAU8540_FEPGA2_MODCH3_SHT,
NAU8540_FEPGA2_MODCH4_SHT | NAU8540_FEPGA2_MODCH3_SHT);
}
static int __maybe_unused nau8540_suspend(struct snd_soc_codec *codec)

12
sound/soc/codecs/nau8540.h
View file

@ -184,6 +184,18 @@
#define NAU8540_PRECHARGE_DIS (0x1 << 13)
#define NAU8540_GLOBAL_BIAS_EN (0x1 << 12)
/* FEPGA1 (0x69) */
#define NAU8540_FEPGA1_MODCH2_SHT_SFT 7
#define NAU8540_FEPGA1_MODCH2_SHT (0x1 << NAU8540_FEPGA1_MODCH2_SHT_SFT)
#define NAU8540_FEPGA1_MODCH1_SHT_SFT 3
#define NAU8540_FEPGA1_MODCH1_SHT (0x1 << NAU8540_FEPGA1_MODCH1_SHT_SFT)
/* FEPGA2 (0x6A) */
#define NAU8540_FEPGA2_MODCH4_SHT_SFT 7
#define NAU8540_FEPGA2_MODCH4_SHT (0x1 << NAU8540_FEPGA2_MODCH4_SHT_SFT)
#define NAU8540_FEPGA2_MODCH3_SHT_SFT 3
#define NAU8540_FEPGA2_MODCH3_SHT (0x1 << NAU8540_FEPGA2_MODCH3_SHT_SFT)
/* System Clock Source */
enum {