[alsa-devel] [PATCH v4 05/14] ASoC: hdac_hdmi: Apply constraints based on ELD

[Mark Brown]

On Wed, Dec 09, 2015 at 09:46:12PM +0530, Subhransu S. Prusty wrote:

> +static int hdac_hdmi_eld_limit_formats(struct snd_pcm_runtime *runtime,
> +						void *eld)
> +{
> +	u64 formats = SNDRV_PCM_FMTBIT_S16;
> +	int i;
> +	const u8 *sad, *eld_buf = eld;
> +
> +	sad = drm_eld_sad(eld_buf);
> +	if (!sad)
> +		goto format_constraint;
> +
> +	for (i = drm_eld_sad_count(eld_buf); i > 0; i--, sad += 3) {
> +		if (sad_format(sad) == 1) { /* AUDIO_CODING_TYPE_LPCM */

	switch (sad_format(sad))  {
	case AUDIO_CODING_TYPE_LPCM:

> +
> +			/* 20 bit and 24 bit */
> +			if (sad_sample_bits_lpcm(sad) & 0x6)
> +				formats |= SNDRV_PCM_FMTBIT_S32;
> +		}
> +	}

I really don't have a clear idea what the above is supposed to do or why
this is specific to HDAC and not handled...

> -	return 0;
> +	return snd_pcm_hw_constraint_eld(substream->runtime,
> +				dai_map->pin->eld.eld_buffer);


...here.
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