linux-kernel - Re: [PATCH] ASoC: meson: g12a-toacodec: add support for SM1 TOACODEC

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Date:   Thu, 29 Apr 2021 19:43:06 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>, broonie@...nel.org
Cc:     alsa-devel@...a-project.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: meson: g12a-toacodec: add support for SM1 TOACODEC


On Thu 29 Apr 2021 at 19:01, Neil Armstrong <narmstrong@...libre.com> wrote:


>  
> +static int sm1_toacodec_mux_put_enum(struct snd_kcontrol *kcontrol,
> +				     struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct snd_soc_component *component =
> +		snd_soc_dapm_kcontrol_component(kcontrol);
> +	struct snd_soc_dapm_context *dapm =
> +		snd_soc_dapm_kcontrol_dapm(kcontrol);
> +	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
> +	unsigned int mux, changed;
> +
> +	mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
> +	changed = snd_soc_component_test_bits(component, e->reg,
> +					      CTRL0_DAT_SEL_SM1,
> +					      FIELD_PREP(CTRL0_DAT_SEL_SM1, mux));
> +
> +	if (!changed)
> +		return 0;
> +
> +	/* Force disconnect of the mux while updating */
> +	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);
> +
> +	snd_soc_component_update_bits(component, e->reg,
> +				      CTRL0_DAT_SEL_SM1 |
> +				      CTRL0_LRCLK_SEL_SM1 |
> +				      CTRL0_BCLK_SEL_SM1,
> +				      FIELD_PREP(CTRL0_DAT_SEL_SM1, mux) |
> +				      FIELD_PREP(CTRL0_LRCLK_SEL_SM1, mux) |
> +				      FIELD_PREP(CTRL0_BCLK_SEL_SM1, mux));
> +
> +	/*
> +	 * FIXME:
> +	 * On this soc, the glue gets the MCLK directly from the clock
> +	 * controller instead of going the through the TDM interface.
> +	 *
> +	 * Here we assume interface A uses clock A, etc ... While it is
> +	 * true for now, it could be different. Instead the glue should
> +	 * find out the clock used by the interface and select the same
> +	 * source. For that, we will need regmap backed clock mux which
> +	 * is a work in progress
> +	 */
> +	snd_soc_component_update_bits(component, e->reg,
> +				      CTRL0_MCLK_SEL,
> +				      FIELD_PREP(CTRL0_MCLK_SEL, mux));
> +
> +	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);
> +
> +	return 0;
> +}

Instead of duplicating this function, I'd prefer if you could use regmap fields