[alsa-devel] [PATCH v2] ASoC: tlv320aic31xx: Fix master mode clock I2S bus clocks

[Peter Ujfalusi]

aargh,

On 2018-02-13 13:22, Peter Ujfalusi wrote:
> In the reset state of the codec we do not have complete playback or capture
> routes.
> 
> The audio playback/capture will not work due to missing clock signals on
> the I2S bus if PLL, MDAC/NDAC/DAC MADC/NADC/ADC is powered down.
> 
> To make sure that even if all output/input is disconnected the codec is
> generating clocks, we need to have valid DAPM route in every case to power
> up the must needed parts of the codec.
> 
> I have verified that switching DAC (during playback) or ADC (during
> capture) will stop the I2S clocks, so the only solution is to connect the
> 'Off' routes as well to output/input.
> 
> The routes only going to be added if the codec is configured as clock
> master.
> 
> Tested on am43x-epos-evm with aic3111 codec in master mode.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
> ---
> Hi,
> 
> Changes since v1:
> - Only apply the master mode DAPM routes when the codec is clock master
> - comments added to explain the need.
> 
> Regards,
> Peter
> 
>  sound/soc/codecs/tlv320aic31xx.c | 46 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c
> index 858cb8be445f..15de89318ff5 100644
> --- a/sound/soc/codecs/tlv320aic31xx.c
> +++ b/sound/soc/codecs/tlv320aic31xx.c
> @@ -166,6 +166,7 @@ struct aic31xx_priv {
>  	unsigned int sysclk;
>  	u8 p_div;
>  	int rate_div_line;
> +	bool master_dapm_route_applied;
>  };
>  
>  struct aic31xx_rate_divs {
> @@ -670,6 +671,29 @@ aic310x_audio_map[] = {
>  	{"SPK", NULL, "SPK ClassD"},
>  };
>  
> +/*
> + * Always connected DAPM routes for codec clock master modes.
> + * If the codec is the master on the I2S bus, we need to power on components
> + * to have valid DAC_CLK and also the DACs and ADC for playback/capture.
> + * Otherwise the codec will not generate clocks on the bus.
> + */
> +static const struct snd_soc_dapm_route
> +common31xx_cm_audio_map[] = {
> +	{"DAC Left Input", "Off", "DAC IN"},
> +	{"DAC Right Input", "Off", "DAC IN"},
> +
> +	{"HPL", NULL, "DAC Left"},
> +	{"HPR", NULL, "DAC Right"},
> +};
> +
> +static const struct snd_soc_dapm_route
> +aic31xx_cm_audio_map[] = {
> +	{"MIC1LP P-Terminal", "Off", "MIC1LP"},
> +	{"MIC1RP P-Terminal", "Off", "MIC1RP"},
> +	{"MIC1LM P-Terminal", "Off", "MIC1LM"},
> +	{"MIC1LM M-Terminal", "Off", "MIC1LM"},
> +};
> +
>  static int aic31xx_add_controls(struct snd_soc_codec *codec)
>  {
>  	int ret = 0;
> @@ -916,6 +940,7 @@ static int aic31xx_set_dai_fmt(struct snd_soc_dai *codec_dai,
>  			       unsigned int fmt)
>  {
>  	struct snd_soc_codec *codec = codec_dai->codec;
> +	struct aic31xx_priv *aic31xx = snd_soc_codec_get_drvdata(codec);
>  	u8 iface_reg1 = 0;
>  	u8 iface_reg2 = 0;
>  	u8 dsp_a_val = 0;
> @@ -992,6 +1017,27 @@ static int aic31xx_set_dai_fmt(struct snd_soc_dai *codec_dai,
>  			    AIC31XX_BCLKINV_MASK,
>  			    iface_reg2);
>  
> +	/* Add the needed DAPM route(s) for codec clock master modes, once */
> +	if (iface_reg1 & (AIC31XX_BCLK_MASTER | AIC31XX_WCLK_MASTER) &&
> +	    !aic31xx->master_dapm_route_applied) {
> +		struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
> +		int ret;
> +
> +		pr_err("%s: trying to add master routes\n", __func__);

Leftover debug prints ;)

> +		ret = snd_soc_dapm_add_routes(dapm, common31xx_cm_audio_map,
> +					ARRAY_SIZE(common31xx_cm_audio_map));
> +		if (!ret && !(aic31xx->codec_type & DAC31XX_BIT))
> +			ret = snd_soc_dapm_add_routes(dapm,
> +					aic31xx_cm_audio_map,
> +					ARRAY_SIZE(aic31xx_cm_audio_map));
> +
> +		pr_err("%s: master routes added with %d\n", __func__, ret);
> +		if (ret)
> +			return ret;
> +
> +		aic31xx->master_dapm_route_applied = true;
> +	}
> +
>  	return 0;
>  }
>  
> 

- Péter

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