linux-kernel - Re: [PATCH v24 34/34] ASoC: qcom: qdsp6: Ensure PCM format is supported by USB audio device

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Message-ID: <c0b5be27-4a7a-4e53-ad90-f384b066791b@linux.intel.com>
Date: Thu, 1 Aug 2024 11:04:26 +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 34/34] ASoC: qcom: qdsp6: Ensure PCM format is
 supported by USB audio device



On 8/1/24 03:17, 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 | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/sound/soc/qcom/qdsp6/q6usb.c b/sound/soc/qcom/qdsp6/q6usb.c
> index d8f1bb4ec497..9a3fb3cb32b2 100644
> --- a/sound/soc/qcom/qdsp6/q6usb.c
> +++ b/sound/soc/qcom/qdsp6/q6usb.c
> @@ -52,6 +52,7 @@ static int q6usb_hw_params(struct snd_pcm_substream *substream,
>  	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);
> +	int direction = substream->stream;
>  	struct q6afe_port *q6usb_afe;
>  	struct snd_soc_usb_device *sdev;
>  	int ret;
> @@ -63,6 +64,10 @@ static int q6usb_hw_params(struct snd_pcm_substream *substream,
>  	mutex_lock(&data->mutex);
>  	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
>  
> +	ret = snd_soc_usb_find_supported_format(sdev->chip_idx, params, direction);
> +	if (ret < 0)
> +		goto out;
> +
>  	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
>  	if (IS_ERR(q6usb_afe))
>  		goto out;

This patch and the previous patch 33 should be added before patch 17,
see comments there.