Re: [PATCH v3 3/3] ASoC: qcom: sc8280xp: add Ayaneo Pocket S2 card with special WSA channel mapping

[Mark Brown]

On Tue, Jul 28, 2026 at 10:46:45AM +0200, Neil Armstrong wrote:
> The WSA Speakers are connected on the WSA2 interface, but the
> WSA and WSA2 links are handled as a single dai and DSP interface, so
> we need to specify the channel mapping of the Ayaneo Pocket S2 for the
> WSA dai in order to have functional playback and avoid DSP errors.

> Let's add a special entry for the Ayaneo Pocket S2 adding a prepare
> callback in order to set the proper channel mapping.

> +static int ayaneo_ps2_snd_prepare(struct snd_pcm_substream *substream)
> +{
> +	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
> +	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
> +	unsigned int channels = substream->runtime->channels;
> +
> +	if (cpu_dai->id != WSA_CODEC_DMA_RX_0)
> +		return 0;
> +
> +	if (channels != 2)
> +		return -EINVAL;

Do we need some constraints somewhere (perhaps it's already taken care
of and I didn't notice)?

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