linux-kernel - Re: [PATCH v3 22/28] ASoC: qcom: qdsp6: q6afe: Split USB AFE dev

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Date:   Thu, 9 Mar 2023 09:01:44 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Wesley Cheng <quic_wcheng@...cinc.com>, mathias.nyman@...el.com,
        perex@...ex.cz, broonie@...nel.org, lgirdwood@...il.com,
        krzysztof.kozlowski+dt@...aro.org, agross@...nel.org,
        Thinh.Nguyen@...opsys.com, bgoswami@...cinc.com,
        andersson@...nel.org, robh+dt@...nel.org,
        gregkh@...uxfoundation.org, tiwai@...e.com
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: [PATCH v3 22/28] ASoC: qcom: qdsp6: q6afe: Split USB AFE
 dev_token param into separate API



On 08/03/2023 23:57, Wesley Cheng wrote:
> The Q6USB backend can carry information about the available USB SND cards
> and PCM devices discovered on the USB bus.  The dev_token field is used by
> the audio DSP to notify the USB offload driver of which card and PCM index
> to enable playback on.  Separate this into a dedicated API, so the USB
> backend can set the dev_token accordingly.  The audio DSP does not utilize
> this information until the AFE port start command is sent, which is done
> during the PCM prepare phase.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---
>   sound/soc/qcom/qdsp6/q6afe.c | 49 +++++++++++++++++++++++++-----------
>   sound/soc/qcom/qdsp6/q6afe.h |  1 +
>   2 files changed, 36 insertions(+), 14 deletions(-)
> 
Looks like this could be part of [06/28] ASoC: qcom: qdsp6: Introduce 
USB AFE port to q6dsp

you are modifying the 06/28 patch in this patch.

other than that it looks fine to me.

--srini

> diff --git a/sound/soc/qcom/qdsp6/q6afe.c b/sound/soc/qcom/qdsp6/q6afe.c
> index e9d5fa6b6b0d..505371c96987 100644
> --- a/sound/soc/qcom/qdsp6/q6afe.c
> +++ b/sound/soc/qcom/qdsp6/q6afe.c
> @@ -1394,10 +1394,42 @@ void q6afe_tdm_port_prepare(struct q6afe_port *port,
>   }
>   EXPORT_SYMBOL_GPL(q6afe_tdm_port_prepare);
>   
> -static int afe_port_send_usb_dev_param(struct q6afe_port *port, struct q6afe_usb_cfg *cfg)
> +/**
> + * afe_port_send_usb_dev_param() - Send USB dev token
> + *
> + * @port: Instance of afe port
> + * @cardidx: USB SND card index to reference
> + * @pcmidx: USB SND PCM device index to reference
> + *
> + * The USB dev token carries information about which USB SND card instance and
> + * PCM device to execute the offload on.  This information is carried through
> + * to the stream enable QMI request, which is handled by the offload class
> + * driver.  The information is parsed to determine which USB device to query
> + * the required resources for.
> + */
> +int afe_port_send_usb_dev_param(struct q6afe_port *port, int cardidx, int pcmidx)
>   {
> -	union afe_port_config *pcfg = &port->port_cfg;
>   	struct afe_param_id_usb_audio_dev_params usb_dev;
> +	int ret;
> +
> +	memset(&usb_dev, 0, sizeof(usb_dev));
> +
> +	usb_dev.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG;
> +	usb_dev.dev_token = (cardidx << 16) | (pcmidx << 8);
> +	ret = q6afe_port_set_param_v2(port, &usb_dev,
> +				AFE_PARAM_ID_USB_AUDIO_DEV_PARAMS,
> +				AFE_MODULE_AUDIO_DEV_INTERFACE, sizeof(usb_dev));
> +	if (ret)
> +		dev_err(port->afe->dev, "%s: AFE device param cmd failed %d\n",
> +			__func__, ret);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(afe_port_send_usb_dev_param);
> +
> +static int afe_port_send_usb_params(struct q6afe_port *port, struct q6afe_usb_cfg *cfg)
> +{
> +	union afe_port_config *pcfg = &port->port_cfg;
>   	struct afe_param_id_usb_audio_dev_lpcm_fmt lpcm_fmt;
>   	struct afe_param_id_usb_audio_svc_interval svc_int;
>   	int ret = 0;
> @@ -1408,20 +1440,9 @@ static int afe_port_send_usb_dev_param(struct q6afe_port *port, struct q6afe_usb
>   		goto exit;
>   	}
>   
> -	memset(&usb_dev, 0, sizeof(usb_dev));
>   	memset(&lpcm_fmt, 0, sizeof(lpcm_fmt));
>   	memset(&svc_int, 0, sizeof(svc_int));
>   
> -	usb_dev.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG;
> -	q6afe_port_set_param_v2(port, &usb_dev,
> -				AFE_PARAM_ID_USB_AUDIO_DEV_PARAMS,
> -				AFE_MODULE_AUDIO_DEV_INTERFACE, sizeof(usb_dev));
> -	if (ret) {
> -		dev_err(port->afe->dev, "%s: AFE device param cmd failed %d\n",
> -			__func__, ret);
> -		goto exit;
> -	}
> -
>   	lpcm_fmt.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG;
>   	lpcm_fmt.endian = pcfg->usb_cfg.endian;
>   	ret = q6afe_port_set_param_v2(port, &lpcm_fmt,
> @@ -1465,7 +1486,7 @@ void q6afe_usb_port_prepare(struct q6afe_port *port,
>   	pcfg->usb_cfg.num_channels = cfg->num_channels;
>   	pcfg->usb_cfg.bit_width = cfg->bit_width;
>   
> -	afe_port_send_usb_dev_param(port, cfg);
> +	afe_port_send_usb_params(port, cfg);
>   }
>   EXPORT_SYMBOL_GPL(q6afe_usb_port_prepare);
>   
> diff --git a/sound/soc/qcom/qdsp6/q6afe.h b/sound/soc/qcom/qdsp6/q6afe.h
> index e098a3e15135..7980416275e9 100644
> --- a/sound/soc/qcom/qdsp6/q6afe.h
> +++ b/sound/soc/qcom/qdsp6/q6afe.h
> @@ -274,6 +274,7 @@ void q6afe_tdm_port_prepare(struct q6afe_port *port, struct q6afe_tdm_cfg *cfg);
>   void q6afe_cdc_dma_port_prepare(struct q6afe_port *port,
>   				struct q6afe_cdc_dma_cfg *cfg);
>   
> +int afe_port_send_usb_dev_param(struct q6afe_port *port, int cardidx, int pcmidx);
>   int q6afe_port_set_sysclk(struct q6afe_port *port, int clk_id,
>   			  int clk_src, int clk_root,
>   			  unsigned int freq, int dir);