linux-kernel - Re: [PATCH v24 15/34] ASoC: qcom: qdsp6: Introduce USB AFE port to q6dsp

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Message-ID: <33f0e72e-aff8-4733-bf71-dd592a99de97@linux.intel.com>
Date: Thu, 1 Aug 2024 10:30:39 +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 15/34] ASoC: qcom: qdsp6: Introduce USB AFE port to
 q6dsp



On 8/1/24 03:17, Wesley Cheng wrote:
> The QC ADSP is able to support USB playback endpoints, so that the main
> application processor can be placed into lower CPU power modes.  This adds
> the required AFE port configurations and port start command to start an
> audio session.
> 
> Specifically, the QC ADSP can support all potential endpoints that are
> exposed by the audio data interface.  This includes, feedback endpoints
> (both implicit and explicit) as well as the isochronous (data) endpoints.
> The size of audio samples sent per USB frame (microframe) will be adjusted
> based on information received on the feedback endpoint.
> 
> Some pre-requisites are needed before issuing the AFE port start command,
> such as setting the USB AFE dev_token.  This carries information about the
> available USB SND cards and PCM devices that have been 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.

It's just fine if the AFE stuff relies on the 'port' definition/concept,
but I don't think it needs to pop-up at the ASoC/USB level.