Re: [PATCH 1/6] ASoC: codecs: aw88166: support changing sample rate and bit width

[Mark Brown <broonie@kernel.org>]

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On Fri, Sep 25, 2026 at 02:47:29AM -0500, Aaron Kling via B4 Relay wrote:

> The aw88166 driver only worked with 32-bit 48kHz streams so far due to
> the lack of a proper PLL initialization sequence. Fix by selecting all
> the necessary PLL settings based on what was passed to us by the
> hw_params/set_fmt ops. This replaces the strange downstream routine
> that tries two divider modes in sequence.

> -	ret = regmap_read(aw_dev->regmap, AW88166_PLLCTRL2_REG, &reg_val);
> +	/* PLL divider must be used for 8/16/32 kHz modes */
> +	ret = regmap_update_bits(aw_dev->regmap, AW88166_PLLCTRL1_REG,
> +			~AW88166_CCO_MUX_MASK, aw88166->cco_mux_value);

We seem to just completely drop all reference to PLLCTRL2 and switch
over to PLLCTRL1, I'm going to guess that this means that something that
used to work now no longer works...

> +static int aw88166_hw_params(struct snd_pcm_substream *substream,
> +	struct snd_pcm_hw_params *params,
> +	struct snd_soc_dai *dai)
> +{
> +	struct snd_soc_component *component = dai->component;
> +	struct aw88166 *aw88166 = snd_soc_component_get_drvdata(component);
> +
> +	case 32:
> +		aw88166->bck_value = AW88166_I2SBCK_64FS_VALUE;
> +		break;
> +	default:
> +		dev_err(aw88166->aw_pa->dev, "unsupported physical bit width %d\n",
> +			params_physical_width(params));
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}

This doesn't touch the hardware, it just writes state so if hw_params()
is called while things are powered up nothing is going to take effect
until the next stream.

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