linux-kernel - Re: [PATCH v24 17/34] ASoC: qcom: qdsp6: Add USB backend ASoC driver for Q6

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Message-ID: <5f37c04d-f564-40b9-a9f3-d071ea0a6f19@linux.intel.com>
Date: Thu, 1 Aug 2024 10:40:20 +0200
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, broonie@...nel.org, lgirdwood@...il.com, krzk+dt@...nel.org,
 Thinh.Nguyen@...opsys.com, bgoswami@...cinc.com, tiwai@...e.com,
 gregkh@...uxfoundation.org, robh@...nel.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 v24 17/34] ASoC: qcom: qdsp6: Add USB backend ASoC driver
 for Q6




> +static int q6usb_hw_params(struct snd_pcm_substream *substream,
> +			   struct snd_pcm_hw_params *params,
> +			   struct snd_soc_dai *dai)
> +{
> +	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> +	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
> +	struct q6afe_port *q6usb_afe;
> +	struct snd_soc_usb_device *sdev;
> +	int ret;
> +
> +	/* No active chip index */
> +	if (list_empty(&data->devices))
> +		return -EINVAL;
> +
> +	mutex_lock(&data->mutex);
> +	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
> +
> +	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
> +	if (IS_ERR(q6usb_afe))
> +		goto out;
> +
> +	/* Notify audio DSP about the devices being offloaded */
> +	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
> +						sdev->pcm_idx);
> +
> +out:
> +	mutex_unlock(&data->mutex);
> +
> +	return ret;
> +}

Humm, multiple questions here

a) is this intentional that the params are not used in a hw_params routine?

b) if yes, could this be replaced by a .prepare callback

c) along the same lines as b), is suspend-resume during playback
supported? Usually this is handled with a .prepare callback to restore
connections.
> +
> +static const struct snd_soc_dai_ops q6usb_ops = {
> +	.hw_params = q6usb_hw_params,
> +};