On Mon, Oct 26, 2020 at 06:40:55PM +0800, Shengjiu Wang wrote:

> +static int fsl_aud2htx_hw_params(struct snd_pcm_substream *substream,
> +				 struct snd_pcm_hw_params *params,
> +				 struct snd_soc_dai *cpu_dai)
> +{
> +	struct fsl_aud2htx *aud2htx = snd_soc_dai_get_drvdata(cpu_dai);
> +
> +	/* DMA request when number of entries < WTMK_LOW */
> +	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
> +			   AUD2HTX_CTRE_DT_MASK, 0);
> +
> +	/* Disable interrupts*/
> +	regmap_update_bits(aud2htx->regmap, AUD2HTX_IRQ_MASK,
> +			   AUD2HTX_WM_HIGH_IRQ_MASK |
> +			   AUD2HTX_WM_LOW_IRQ_MASK |
> +			   AUD2HTX_OVF_MASK,
> +			   AUD2HTX_WM_HIGH_IRQ_MASK |
> +			   AUD2HTX_WM_LOW_IRQ_MASK |
> +			   AUD2HTX_OVF_MASK);
> +
> +	/* Configur watermark */
> +	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
> +			   AUD2HTX_CTRE_WL_MASK,
> +			   AUD2HTX_WTMK_LOW << AUD2HTX_CTRE_WL_SHIFT);
> +	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
> +			   AUD2HTX_CTRE_WH_MASK,
> +			   AUD2HTX_WTMK_HIGH << AUD2HTX_CTRE_WH_SHIFT);
> +	return 0;
> +}

This doesn't look like a hw_params operation - it doesn't appear to
reference the params at all, or even containt any conditional
statements.  Shouldn't this be configured just once at driver load?