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Subject: Re: [RFC PATCH 12/14] sound: soc: qcom: qusb6: Ensure PCM format is
 supported by USB audio device
To:     Wesley Cheng <quic_wcheng@quicinc.com>,
        <srinivas.kandagatla@linaro.org>, <mathias.nyman@intel.com>,
        <perex@perex.cz>, <broonie@kernel.org>, <lgirdwood@gmail.com>,
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        <gregkh@linuxfoundation.org>, <Thinh.Nguyen@synopsys.com>,
        <bgoswami@quicinc.com>, <tiwai@suse.com>, <robh+dt@kernel.org>,
        <agross@kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <alsa-devel@alsa-project.org>, <devicetree@vger.kernel.org>,
        <linux-usb@vger.kernel.org>, <quic_jackp@quicinc.com>,
        <quic_plai@quicinc.com>
References: <20221223233200.26089-1-quic_wcheng@quicinc.com>
 <20221223233200.26089-13-quic_wcheng@quicinc.com>
From:   Sergey Shtylyov <s.shtylyov@omp.ru>
Organization: Open Mobile Platform
Message-ID: <6e5da084-d2fb-4b84-1c3c-cd428ee111ec@omp.ru>
Date:   Sat, 24 Dec 2022 11:19:04 +0300
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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@quicinc.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