Re: [PATCH v1 1/2] ASoC: qcom: sdm845: skip set_channel_map for SDW stream DAIs

[Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>]

On 6/29/26 3:16 PM, Mohammad Rafi Shaik wrote:
> On sdm845 the SLIM Playback backend lists wcd934x alongside the qcom
> SoundWire master and its SWR slave speaker codecs as codec DAIs on the
> same link. sdm845_dai_init() was calling set_channel_map with hardcoded
> wcd934x SLIM channel numbers for every codec DAI on that link, including
> the SoundWire ones, corrupting their channel configuration.
> 
> Skip set_channel_map for any DAI that implements .set_stream, as that op
> is the distinguishing marker of DAIs that own an SDW stream path — both
> the qcom SWR master and SWR slave codecs register it, while wcd934x does
> not. This confines the SLIM channel map to wcd934x where it belongs.
> 
> Signed-off-by: Mohammad Rafi Shaik <mohammad.rafi.shaik@oss.qualcomm.com>
> ---
>  sound/soc/qcom/sdm845.c | 27 ++++++++++++++++++++-------
>  1 file changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/sound/soc/qcom/sdm845.c b/sound/soc/qcom/sdm845.c
> index 0ce9dff4dc52..509d7a551397 100644
> --- a/sound/soc/qcom/sdm845.c
> +++ b/sound/soc/qcom/sdm845.c
> @@ -294,13 +294,26 @@ static int sdm845_dai_init(struct snd_soc_pcm_runtime *rtd)
>  			return 0;
>  
>  		for_each_rtd_codec_dais(rtd, i, codec_dai) {
> -			rval = snd_soc_dai_set_channel_map(codec_dai,
> -							  ARRAY_SIZE(tx_ch),
> -							  tx_ch,
> -							  ARRAY_SIZE(rx_ch),
> -							  rx_ch);
> -			if (rval != 0 && rval != -ENOTSUPP)
> -				return rval;
> +			component = codec_dai->component;
> +
> +			if (!component || !component->dev)
> +				continue;
> +
> +			/*
> +			 * Only wcd934x (SLIM codec) needs these static channel maps.
> +			 * DAIs that own an SDW stream — the qcom SWR master and SWR
> +			 * slave speaker codecs — implement .set_stream; skip them.
> +			 */
> +			if (!codec_dai->driver || !codec_dai->driver->ops ||
> +			    !codec_dai->driver->ops->set_stream) {

This is totally a hack.

--srini
> +				rval = snd_soc_dai_set_channel_map(codec_dai,
> +								   ARRAY_SIZE(tx_ch),
> +								   tx_ch,
> +								   ARRAY_SIZE(rx_ch),
> +								   rx_ch);
> +				if (rval != 0 && rval != -ENOTSUPP)
> +					return rval;
> +			}
>  
>  			snd_soc_dai_set_sysclk(codec_dai, 0,
>  					       WCD934X_DEFAULT_MCLK_RATE,