linux-kernel - Re: [RFC PATCH 12/14] sound: soc: qcom: qusb6: Ensure PCM format is supported by USB audio device

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Date:   Sat, 24 Dec 2022 11:19:04 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Wesley Cheng <quic_wcheng@...cinc.com>,
        <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <gregkh@...uxfoundation.org>, <Thinh.Nguyen@...opsys.com>,
        <bgoswami@...cinc.com>, <tiwai@...e.com>, <robh+dt@...nel.org>,
        <agross@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>
Subject: Re: [RFC PATCH 12/14] sound: soc: qcom: qusb6: Ensure PCM format is
 supported by USB audio device

Hello!

On 12/24/22 2:31 AM, Wesley Cheng wrote:

> Check for if the PCM format is supported during the hw_params callback.  If
> the profile is not supported then the userspace ALSA entity will receive an
> error, and can take further action.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---
>  sound/soc/qcom/qdsp6/q6usb.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/qcom/qdsp6/q6usb.c b/sound/soc/qcom/qdsp6/q6usb.c
> index a9da6dec6c6f..128e0974db4e 100644
> --- a/sound/soc/qcom/qdsp6/q6usb.c
> +++ b/sound/soc/qcom/qdsp6/q6usb.c
> @@ -42,7 +42,14 @@ static int q6usb_hw_params(struct snd_pcm_substream *substream,
>  			   struct snd_pcm_hw_params *params,
>  			   struct snd_soc_dai *dai)
>  {
> -	return 0;
> +	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
> +	int direction = substream->stream;
> +	int ret;

   You don't seem to need this variable, just use *return*
snd_soc_usb_find_format(...).

> +
> +	ret = snd_soc_usb_find_format(data->active_idx, params, direction);
> +
> +	return ret;
> +
>  }
>  static const struct snd_soc_dai_ops q6usb_ops = {
>  	.hw_params	= q6usb_hw_params,

MBR, Sergey