linux-kernel - Re: [PATCH v12 00/41] Introduce QC USB SND audio offloading support

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Date: Sat,  6 Jan 2024 16:54:03 +0800
From: Hillf Danton <hdanton@...a.com>
To: Wesley Cheng <quic_wcheng@...cinc.com>
Cc: gregkh@...uxfoundation.org,
	tiwai@...e.com,
	robh+dt@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH v12 00/41] Introduce QC USB SND audio offloading support

On Tue, 2 Jan 2024 13:45:08 -0800 Wesley Cheng <quic_wcheng@...cinc.com>
> Changes in v2:
> 
> XHCI:
> - Replaced XHCI and HCD changes with Mathias' XHCI interrupter changes
> in his tree:
> https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git/log/?h=feature_interrupters
> 
> Adjustments made to Mathias' changes:
>   - Created xhci-intr.h to export/expose interrupter APIs versus exposing xhci.h.
>     Moved dependent structures to this file as well. (so clients can parse out
>     information from "struct xhci_interrupter")
>   - Added some basic locking when requesting interrupters.
>   - Fixed up some sanity checks.
>   - Removed clearing of the ERSTBA during freeing of the interrupter. (pending
>     issue where SMMU fault occurs if DMA addr returned is 64b - TODO)
> 
> - Clean up pending events in the XHCI secondary interrupter.  While testing USB
> bus suspend, it was seen that on bus resume, the xHCI HC would run into a command
> timeout.
> - Added offloading APIs to xHCI to fetch transfer and event ring information.
> 
> ASoC:
> - Modified soc-usb to allow for multiple USB port additions.  For this to work,
> the USB offload driver has to have a reference to the USB backend by adding
> a "usb-soc-be" DT entry to the device saved into XHCI sysdev.

Could you tip point to where the usb-soc-be DT entry is added?

> - Created separate dt-bindings for defining USB_RX port.
> - Increased APR timeout to accommodate the situation where the AFE port start
> command could be delayed due to having to issue a USB bus resume while
> handling the QMI stream start command.