From 14323ff8c21825e20810e893312f9321f9e4e72c Mon Sep 17 00:00:00 2001 From: John Hsu Date: Tue, 7 Nov 2017 15:23:18 +0800 Subject: [PATCH] ASoC: nau8540: PGA short to ground 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 Signed-off-by: Mark Brown --- sound/soc/codecs/nau8540.c | 7 +++++++ sound/soc/codecs/nau8540.h | 12 ++++++++++++ 2 files changed, 19 insertions(+) diff --git a/sound/soc/codecs/nau8540.c b/sound/soc/codecs/nau8540.c index c10cbffa6314..8246486a588d 100644 --- a/sound/soc/codecs/nau8540.c +++ b/sound/soc/codecs/nau8540.c @@ -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) diff --git a/sound/soc/codecs/nau8540.h b/sound/soc/codecs/nau8540.h index 14339f9bb01a..7083d4821ce4 100644 --- a/sound/soc/codecs/nau8540.h +++ b/sound/soc/codecs/nau8540.h @@ -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 {