RE: [PATCHv4] ASoC: da7213: add default clock handling

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On 26 June 2020 17:46, Sebastian Reichel wrote:

> This adds default clock/PLL configuration to the driver
> for usage with generic drivers like simple-card for usage
> with a fixed rate clock.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>

Looks good. Thanks for the work here.

Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@xxxxxxxxxxx>

> ---
> Changes since PATCHv3:
>  * rebase to v5.8-rc1
>  * add SRM support for usage in slave mode with simple-card.
>    I only tested with master mode, though.
> ---
>  sound/soc/codecs/da7213.c | 83
> ++++++++++++++++++++++++++++++++++++---
>  sound/soc/codecs/da7213.h |  2 +
>  2 files changed, 80 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/soc/codecs/da7213.c b/sound/soc/codecs/da7213.c
> index 3e6ad996741b..1a4fece20bcd 100644
> --- a/sound/soc/codecs/da7213.c
> +++ b/sound/soc/codecs/da7213.c
> @@ -1156,6 +1156,7 @@ static int da7213_hw_params(struct
> snd_pcm_substream *substream,
>  			    struct snd_soc_dai *dai)
>  {
>  	struct snd_soc_component *component = dai->component;
> +	struct da7213_priv *da7213 =
> snd_soc_component_get_drvdata(component);
>  	u8 dai_ctrl = 0;
>  	u8 fs;
> 
> @@ -1181,33 +1182,43 @@ static int da7213_hw_params(struct
> snd_pcm_substream *substream,
>  	switch (params_rate(params)) {
>  	case 8000:
>  		fs = DA7213_SR_8000;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_98304000;
>  		break;
>  	case 11025:
>  		fs = DA7213_SR_11025;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_90316800;
>  		break;
>  	case 12000:
>  		fs = DA7213_SR_12000;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_98304000;
>  		break;
>  	case 16000:
>  		fs = DA7213_SR_16000;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_98304000;
>  		break;
>  	case 22050:
>  		fs = DA7213_SR_22050;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_90316800;
>  		break;
>  	case 32000:
>  		fs = DA7213_SR_32000;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_98304000;
>  		break;
>  	case 44100:
>  		fs = DA7213_SR_44100;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_90316800;
>  		break;
>  	case 48000:
>  		fs = DA7213_SR_48000;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_98304000;
>  		break;
>  	case 88200:
>  		fs = DA7213_SR_88200;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_90316800;
>  		break;
>  	case 96000:
>  		fs = DA7213_SR_96000;
> +		da7213->out_rate = DA7213_PLL_FREQ_OUT_98304000;
>  		break;
>  	default:
>  		return -EINVAL;
> @@ -1392,9 +1403,9 @@ static int da7213_set_component_sysclk(struct
> snd_soc_component *component,
>  }
> 
>  /* Supported PLL input frequencies are 32KHz, 5MHz - 54MHz. */
> -static int da7213_set_component_pll(struct snd_soc_component *component,
> -				    int pll_id, int source,
> -				    unsigned int fref, unsigned int fout)
> +static int _da7213_set_component_pll(struct snd_soc_component
> *component,
> +				     int pll_id, int source,
> +				     unsigned int fref, unsigned int fout)
>  {
>  	struct da7213_priv *da7213 =
> snd_soc_component_get_drvdata(component);
> 
> @@ -1503,6 +1514,16 @@ static int da7213_set_component_pll(struct
> snd_soc_component *component,
>  	return 0;
>  }
> 
> +static int da7213_set_component_pll(struct snd_soc_component *component,
> +				    int pll_id, int source,
> +				    unsigned int fref, unsigned int fout)
> +{
> +	struct da7213_priv *da7213 =
> snd_soc_component_get_drvdata(component);
> +	da7213->fixed_clk_auto_pll = false;
> +
> +	return _da7213_set_component_pll(component, pll_id, source, fref,
> fout);
> +}
> +
>  /* DAI operations */
>  static const struct snd_soc_dai_ops da7213_dai_ops = {
>  	.hw_params	= da7213_hw_params,
> @@ -1532,6 +1553,50 @@ static struct snd_soc_dai_driver da7213_dai = {
>  	.symmetric_rates = 1,
>  };
> 
> +static int da7213_set_auto_pll(struct snd_soc_component *component, bool
> enable)
> +{
> +	struct da7213_priv *da7213 =
> snd_soc_component_get_drvdata(component);
> +	int mode;
> +
> +	if (!da7213->fixed_clk_auto_pll)
> +		return 0;
> +
> +	da7213->mclk_rate = clk_get_rate(da7213->mclk);
> +
> +	if (enable) {
> +		/* Slave mode needs SRM for non-harmonic frequencies */
> +		if (da7213->master)
> +			mode = DA7213_SYSCLK_PLL;
> +		else
> +			mode = DA7213_SYSCLK_PLL_SRM;
> +
> +		/* PLL is not required for harmonic frequencies */
> +		switch (da7213->out_rate) {
> +		case DA7213_PLL_FREQ_OUT_90316800:
> +			if (da7213->mclk_rate == 11289600 ||
> +			    da7213->mclk_rate == 22579200 ||
> +			    da7213->mclk_rate == 45158400)
> +				mode = DA7213_SYSCLK_MCLK;
> +			break;
> +		case DA7213_PLL_FREQ_OUT_98304000:
> +			if (da7213->mclk_rate == 12288000 ||
> +			    da7213->mclk_rate == 24576000 ||
> +			    da7213->mclk_rate == 49152000)
> +				mode = DA7213_SYSCLK_MCLK;
> +
> +			break;
> +		default:
> +			return -1;
> +		}
> +	} else {
> +		/* Disable PLL in standby */
> +		mode = DA7213_SYSCLK_MCLK;
> +	}
> +
> +	return _da7213_set_component_pll(component, 0, mode,
> +					 da7213->mclk_rate, da7213->out_rate);
> +}
> +
>  static int da7213_set_bias_level(struct snd_soc_component *component,
>  				 enum snd_soc_bias_level level)
>  {
> @@ -1551,6 +1616,8 @@ static int da7213_set_bias_level(struct
> snd_soc_component *component,
>  						"Failed to enable mclk\n");
>  					return ret;
>  				}
> +
> +				da7213_set_auto_pll(component, true);
>  			}
>  		}
>  		break;
> @@ -1562,8 +1629,10 @@ static int da7213_set_bias_level(struct
> snd_soc_component *component,
>  					    DA7213_VMID_EN | DA7213_BIAS_EN);
>  		} else {
>  			/* Remove MCLK */
> -			if (da7213->mclk)
> +			if (da7213->mclk) {
> +				da7213_set_auto_pll(component, false);
>  				clk_disable_unprepare(da7213->mclk);
> +			}
>  		}
>  		break;
>  	case SND_SOC_BIAS_OFF:
> @@ -1693,7 +1762,6 @@ static struct da7213_platform_data
>  	return pdata;
>  }
> 
> -
>  static int da7213_probe(struct snd_soc_component *component)
>  {
>  	struct da7213_priv *da7213 =
> snd_soc_component_get_drvdata(component);
> @@ -1829,6 +1897,11 @@ static int da7213_probe(struct snd_soc_component
> *component)
>  			return PTR_ERR(da7213->mclk);
>  		else
>  			da7213->mclk = NULL;
> +	} else {
> +		/* Do automatic PLL handling assuming fixed clock until
> +		 * set_pll() has been called. This makes the codec usable
> +		 * with the simple-audio-card driver. */
> +		da7213->fixed_clk_auto_pll = true;
>  	}
> 
>  	return 0;
> diff --git a/sound/soc/codecs/da7213.h b/sound/soc/codecs/da7213.h
> index 3890829dfb6e..97ccf0ddd2be 100644
> --- a/sound/soc/codecs/da7213.h
> +++ b/sound/soc/codecs/da7213.h
> @@ -535,10 +535,12 @@ struct da7213_priv {
>  	struct regulator_bulk_data supplies[DA7213_NUM_SUPPLIES];
>  	struct clk *mclk;
>  	unsigned int mclk_rate;
> +	unsigned int out_rate;
>  	int clk_src;
>  	bool master;
>  	bool alc_calib_auto;
>  	bool alc_en;
> +	bool fixed_clk_auto_pll;
>  	struct da7213_platform_data *pdata;
>  };
> 
> --
> 2.27.0





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