[alsa-devel] [PATCH] ASoC: sgtl5000: fix power on/off of MIC bias

[Dong Aisheng-B29396]

> -----Original Message-----
> From: alsa-devel-bounces at alsa-project.org [mailto:alsa-devel-
> bounces at alsa-project.org] On Behalf Of Shawn Guo
> Sent: Wednesday, March 28, 2012 3:31 PM
> To: alsa-devel at alsa-project.org
> Cc: Xu Lionel-R63889; Mark Brown; Zeng at alsa-project.org; Zhaoming; Shawn
> Guo; Xu Lionel-R63889; linux-arm-kernel at lists.infradead.org
> Subject: [alsa-devel] [PATCH] ASoC: sgtl5000: fix power on/off of MIC
> bias
> 
> From: Lionel Xu <Lionel.Xu at freescale.com>
> 
> There is no sound in the recorded wav, to enable recording, the VAG
> should be powered up, and the mic bias resistor should be set up with
> proper value.
> 
> Signed-off-by: Lionel Xu <lionel.xu at freescale.com>
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> Cc: Zeng Zhaoming <zengzm.kernel at gmail.com>
> ---
>  sound/soc/codecs/sgtl5000.c |   14 +++++++++++---
>  1 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
> index d192626..a24299c 100644
> --- a/sound/soc/codecs/sgtl5000.c
> +++ b/sound/soc/codecs/sgtl5000.c
> @@ -132,11 +132,18 @@ static int mic_bias_event(struct
> snd_soc_dapm_widget *w,
>  		snd_soc_update_bits(w->codec, SGTL5000_CHIP_MIC_CTRL,
>  				SGTL5000_BIAS_R_MASK,
>  				SGTL5000_BIAS_R_4k << SGTL5000_BIAS_R_SHIFT);
> +
> +		snd_soc_update_bits(w->codec, SGTL5000_CHIP_ANA_POWER,
> +				SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP);
Did you test line-in record?
IIRC for line-in record, it may also need VAG_POWER up.
Then only enable VAG_POWER for mic_bias_event may not be sufficient.
Will verify it latter when I'm free.

Regards
Dong Aisheng

>  		break;
> 
>  	case SND_SOC_DAPM_PRE_PMD:
>  		snd_soc_update_bits(w->codec, SGTL5000_CHIP_MIC_CTRL,
> -				SGTL5000_BIAS_R_MASK, 0);
> +				SGTL5000_BIAS_R_MASK,
> +				SGTL5000_BIAS_R_off << SGTL5000_BIAS_R_SHIFT);
> +
> +		snd_soc_update_bits(w->codec, SGTL5000_CHIP_ANA_POWER,
> +				SGTL5000_VAG_POWERUP, 0);
>  		break;
>  	}
>  	return 0;
> @@ -197,7 +204,7 @@ static const struct snd_soc_dapm_widget
> sgtl5000_dapm_widgets[] = {
>  	SND_SOC_DAPM_OUTPUT("HP_OUT"),
>  	SND_SOC_DAPM_OUTPUT("LINE_OUT"),
> 
> -	SND_SOC_DAPM_MICBIAS_E("Mic Bias", SGTL5000_CHIP_MIC_CTRL, 8, 0,
> +	SND_SOC_DAPM_MICBIAS_E("Mic Bias", SND_SOC_NOPM, 0, 0,
>  				mic_bias_event,
>  				SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
> 
> @@ -229,7 +236,8 @@ static const struct snd_soc_dapm_widget
> sgtl5000_dapm_widgets[] = {
>  /* routes for sgtl5000 */
>  static const struct snd_soc_dapm_route sgtl5000_dapm_routes[] = {
>  	{"Capture Mux", "LINE_IN", "LINE_IN"},	/* line_in --> adc_mux */
> -	{"Capture Mux", "MIC_IN", "MIC_IN"},	/* mic_in --> adc_mux */
> +	{"Mic Bias", NULL, "MIC_IN"},		/* mic_in --> mic bias */
> +	{"Capture Mux", "MIC_IN", "Mic Bias"},	/* mic bias --> adc_mux
> */
> 
>  	{"ADC", NULL, "Capture Mux"},		/* adc_mux --> adc */
>  	{"AIFOUT", NULL, "ADC"},		/* adc --> i2s_out */
> --
> 1.7.4.1
> 
> 
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