[alsa-devel] [PATCH v6 2/2] drm/i2c:tda998x: Use the HDMI audio CODEC

[Jean-Francois Moine]

On Wed, 1 Oct 2014 17:05:32 +0300
Jyri Sarha <jsarha at ti.com> wrote:

> >   	case AFMT_I2S:
>  >   		reg_write(priv, REG_MUX_AP, MUX_AP_SELECT_I2S);
>  >   		clksel_aip = AIP_CLKSEL_AIP_I2S;
>  >   		clksel_fs = AIP_CLKSEL_FS_ACLK;
>  > -		cts_n = CTS_N_M(3) | CTS_N_K(3);
>  > +
>  > +		/* with I2S input, the CTS_N predivider depends on
>  > +		 * the sample width */
>  > +		switch (priv->audio_sample_format) {
>  > +		case SNDRV_PCM_FORMAT_S16_LE:
>  > +			cts_n = CTS_N_M(3) | CTS_N_K(1);
>  > +			break;
>  > +		case SNDRV_PCM_FORMAT_S24_LE:
>  > +			cts_n = CTS_N_M(3) | CTS_N_K(2);
>  > +			break;
>  > +		default:  
> 
> Setting the default here does not really help, because
> priv->audio_sample_format is initialized to SNDRV_PCM_FORMAT_S24_LE in
> tda998x_encoder_set_config(). But I am Ok with the default being
> changed for 24 bit samples on i2s interface.
> 
>  > +		case SNDRV_PCM_FORMAT_S32_LE:
>  > +			cts_n = CTS_N_M(3) | CTS_N_K(3);
>  > +			break;
>  > +		}

I looked again at the original driver and they set K = 1 for 16 bits
and K = 3 for 24 or 32 bits.

Anyway, letting K = 3 for 16 bits works for me, so, I will not change
this code in the next version.

Thanks.

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