linux-kernel - Re: [RFC PATCH 03/14] ASoC: qcom: Add USB backend ASoC driver for Q6

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Message-ID: <Y6r9EKn7WU3eWl8e@sirena.org.uk>
Date:   Tue, 27 Dec 2022 14:11:28 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, lgirdwood@...il.com, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, Thinh.Nguyen@...opsys.com,
        bgoswami@...cinc.com, tiwai@...e.com, robh+dt@...nel.org,
        agross@...nel.org, 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: [RFC PATCH 03/14] ASoC: qcom: Add USB backend ASoC driver for Q6

On Tue, Dec 27, 2022 at 03:02:31PM +0100, Takashi Iwai wrote:
> Greg KH wrote:
> > On Tue, Dec 27, 2022 at 01:04:55PM +0000, Mark Brown wrote:
> > > On Sat, Dec 24, 2022 at 10:02:59AM +0100, Greg KH wrote:

> > > > "be"?  What is that?

> > > Back end.  This is a concept in DPCM which should be reasonably
> > > discoverable to people working on the audio portions of this code.

> > Ok, then how is the reference counting logic handled here?  USB devices
> > can be removed from the system at any point in time...

> The whole picture is fairly complex, and this patch is a part
> belonging to the ASoC machine driver -- that is, it's bound to the
> Qualcomm host, and there can be only one on a system.  

> OTOH, USB audio devices are still managed by the existing USB audio
> driver as is, and they can be multiple and any devices.  The basic
> idea here is a hijack of the USB data processing in USB audio driver
> with the offloading mechanism by this ASoC driver (only if the
> condition met).

Right.  I haven't even begun to look at the actual code here, just
triaging my inbox, so I've got no thoughts on if things work or not.

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