linux-kernel - Re: [PATCH v3 00/28] Introduce QC USB SND audio offloading support

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Message-ID: <e270cffa-d27b-40e0-aed5-104514e4ba94@sirena.org.uk>
Date:   Wed, 15 Mar 2023 16:29:36 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Wesley Cheng <quic_wcheng@...cinc.com>,
        srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, 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,
        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 00/28] Introduce QC USB SND audio offloading support

On Wed, Mar 15, 2023 at 09:30:58AM -0500, Pierre-Louis Bossart wrote:

> That's probably ok then, am I getting this right that the the DSP card
> would not expose any USB-related kcontrols then, i.e. the ONLY path to
> change volumes, etc.,  would through the regular USB card kcontrols?

> That would limit the changes in the platform sound card to the addition
> of a PCM USB device.

I'd guess that there might be some volume control in the DSP as part of
the generic routing to the port (eg, if all ports have some output
control) but I'm not sure that's an issue, could even be useful for
normalising the output of DSP algorithms compared to direct PCM
playback.

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