diff options
| author | Javier Martin <javier.martin@vista-silicon.com> | 2012-10-31 11:53:33 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-11-01 15:35:56 +0100 |
| commit | a405387c6825b1fc1956e22b10160b0f31536f3f (patch) | |
| tree | 05d36e0c8f87c1e487b353282ed9aad7c3581c02 | |
| parent | Linux 3.7-rc3 (diff) | |
| download | linux-a405387c6825b1fc1956e22b10160b0f31536f3f.tar.xz linux-a405387c6825b1fc1956e22b10160b0f31536f3f.zip | |
ASoC: tlv320aic32x4: Fix problem with first capture.
In its previous status, the first capture didn't work properly;
nothing was actually recorded from the microphone. This
behaviour was observed using a Visstrim M10 board.
In order to solve this BUG a workaround has been added that,
during the initialization process of the codec, powers on and
off the ADC.
The issue seems related to a HW BUG or some behavior that
is not documented in the datasheet.
Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| -rw-r--r-- | sound/soc/codecs/tlv320aic32x4.c | 10 | ||||
| -rw-r--r-- | sound/soc/codecs/tlv320aic32x4.h | 3 |
2 files changed, 13 insertions, 0 deletions
diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c index f230292ba96b..d7d0e18f794c 100644 --- a/sound/soc/codecs/tlv320aic32x4.c +++ b/sound/soc/codecs/tlv320aic32x4.c @@ -675,6 +675,16 @@ static int aic32x4_probe(struct snd_soc_codec *codec) ARRAY_SIZE(aic32x4_snd_controls)); aic32x4_add_widgets(codec); + /* + * Workaround: for an unknown reason, the ADC needs to be powered up + * and down for the first capture to work properly. It seems related to + * a HW BUG or some kind of behavior not documented in the datasheet. + */ + tmp_reg = snd_soc_read(codec, AIC32X4_ADCSETUP); + snd_soc_write(codec, AIC32X4_ADCSETUP, tmp_reg | + AIC32X4_LADC_EN | AIC32X4_RADC_EN); + snd_soc_write(codec, AIC32X4_ADCSETUP, tmp_reg); + return 0; } diff --git a/sound/soc/codecs/tlv320aic32x4.h b/sound/soc/codecs/tlv320aic32x4.h index aae2b2440398..35774223fd91 100644 --- a/sound/soc/codecs/tlv320aic32x4.h +++ b/sound/soc/codecs/tlv320aic32x4.h @@ -94,6 +94,9 @@ #define AIC32X4_WORD_LEN_24BITS 0x02 #define AIC32X4_WORD_LEN_32BITS 0x03 +#define AIC32X4_LADC_EN (1 << 7) +#define AIC32X4_RADC_EN (1 << 6) + #define AIC32X4_I2S_MODE 0x00 #define AIC32X4_DSP_MODE 0x01 #define AIC32X4_RIGHT_JUSTIFIED_MODE 0x02 |