linux-kernel - Re: [RFC PATCH 04/14] sound: usb: card: Introduce USB SND vendor op callbacks

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Date:   Thu, 29 Dec 2022 14:49:21 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Wesley Cheng <quic_wcheng@...cinc.com>,
        srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, broonie@...nel.org, lgirdwood@...il.com,
        andersson@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        gregkh@...uxfoundation.org, Thinh.Nguyen@...opsys.com,
        bgoswami@...cinc.com, tiwai@...e.com, robh+dt@...nel.org,
        agross@...nel.org
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: [RFC PATCH 04/14] sound: usb: card: Introduce USB SND vendor op
 callbacks



On 24.12.22 00:31, Wesley Cheng wrote:
> Allow for different vendors to be notified on USB SND connect/disconnect
> seqeunces.  This allows for vendor USB SND modules to properly initialize
> and populate internal structures with references to the USB SND chip
> device.

Hi,

this raises a design question. If the system is suspending or, worse,
hibernating, how do you make sure the offloader and the device are
suspended in the correct order?
And what happens if you need to go into reset_resume() when resuming?

	Regards
		Oliver