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

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On Sat, Dec 24, 2022 at 10:02:59AM +0100, Greg KH wrote:
> On Fri, Dec 23, 2022 at 03:31:49PM -0800, Wesley Cheng wrote:

> > + * struct q6usb_offload
> > + * @dev - dev handle to usb be

> "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.

> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.

> All of the code in this patch series is older than 2022 as I know it has
> been in shipping devices for many years.  Please use the proper
> copyright year to make your lawyers happy...

Are you *positive* about this.  Based on some preparatory discussions
the Qualcomm people had with Takashi and I it seemed like this was a new
version of existing concepts.  I'm sure they had something already but
it's not obvious to me that they're just posting the same code.

> > +static const struct snd_soc_dapm_route q6usb_dapm_routes[] = {
> > +	{"USB Playback", NULL, "USB_RX_BE"},
> > +};

> No terminating entry?  How does this not break?  Why do you need to
> specify the size of the array, that feels like a design bug somewhere.

It's how the interface works, the number of entries is passed in when
adding routes.

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