linux-kernel - Re: [PATCH v1 10/10] ASoC: qcom: sm8250: force single channel via RX

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Message-ID: <33174321-d81d-472a-b267-ed2cdd691b74@oss.qualcomm.com>
Date: Mon, 4 Nov 2024 12:19:02 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Alexey Klimov <alexey.klimov@...aro.org>, broonie@...nel.org,
        konradybcio@...nel.org, konrad.dybcio@....qualcomm.com,
        andersson@...nel.org, srinivas.kandagatla@...aro.org
Cc: tiwai@...e.com, lgirdwood@...il.com, perex@...ex.cz, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, dmitry.baryshkov@...aro.org,
        linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 10/10] ASoC: qcom: sm8250: force single channel via
 RX_1 output

On 1.11.2024 6:31 AM, Alexey Klimov wrote:
> In case of mono configurations we need to enforce single channel
> output. This is required for audio playback on QRB4210 RB2 board.
> 
> Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> Signed-off-by: Alexey Klimov <alexey.klimov@...aro.org>
> ---
>  sound/soc/qcom/sm8250.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/sound/soc/qcom/sm8250.c b/sound/soc/qcom/sm8250.c
> index 45e0c33fc3f3..7994488d7998 100644
> --- a/sound/soc/qcom/sm8250.c
> +++ b/sound/soc/qcom/sm8250.c
> @@ -39,10 +39,20 @@ static int sm8250_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
>  					SNDRV_PCM_HW_PARAM_RATE);
>  	struct snd_interval *channels = hw_param_interval(params,
>  					SNDRV_PCM_HW_PARAM_CHANNELS);
> +	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
>  
>  	rate->min = rate->max = 48000;
>  	channels->min = channels->max = 2;
>  
> +	/* Maybe should be moved to driver data variant */
> +	switch (cpu_dai->id) {
> +	case RX_CODEC_DMA_RX_1:
> +		channels->min = channels->max = 1;
> +		break;

This doesn't seem to be specific to either 8250 or 6115. It looks like
this is board specific.

Konrad