linux-kernel - Re: [PATCH v21 09/39] ASoC: qcom: qdsp6: Introduce USB AFE port to q6dsp

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Date: Tue, 7 May 2024 15:37:29 -0500
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Wesley Cheng <quic_wcheng@...cinc.com>, srinivas.kandagatla@...aro.org,
 mathias.nyman@...el.com, perex@...ex.cz, conor+dt@...nel.org,
 corbet@....net, lgirdwood@...il.com, andersson@...nel.org,
 krzk+dt@...nel.org, gregkh@...uxfoundation.org, Thinh.Nguyen@...opsys.com,
 broonie@...nel.org, bgoswami@...cinc.com, tiwai@...e.com,
 bagasdotme@...il.com, robh@...nel.org, konrad.dybcio@...aro.org
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-sound@...r.kernel.org, linux-usb@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-doc@...r.kernel.org,
 alsa-devel@...a-project.org
Subject: Re: [PATCH v21 09/39] ASoC: qcom: qdsp6: Introduce USB AFE port to
 q6dsp


>  static struct snd_soc_dai_driver q6dsp_audio_fe_dais[] = {
> +	{
> +		.playback = {
> +			.stream_name = "USB Playback",
> +			.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
> +					SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |
> +					SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
> +					SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |
> +					SNDRV_PCM_RATE_192000,
> +			.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
> +					SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |
> +					SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
> +					SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
> +			.channels_min = 1,
> +			.channels_max = 2,
> +			.rate_min =	8000,
> +			.rate_max = 192000,
> +		},
> +		.id = USB_RX,
> +		.name = "USB_RX",
> +	},

Wait, is this saying you will have exactly one PCM device/FE DAI
connected to the USB BE DAI exposed in patch 11?

> +	SND_SOC_DAPM_MIXER("USB Mixer", SND_SOC_NOPM, 0, 0,
> +			   usb_mixer_controls,
> +			   ARRAY_SIZE(usb_mixer_controls)),
> +

And then what is the role of the USB mixer if you only have one input?

I must be missing something.