linux-kernel - Re: [RFC PATCH v2 00/22] Introduce QC USB SND audio offloading support

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Message-ID: <1e889754-6492-4c53-27f0-796002d5680c@linux.intel.com>
Date:   Thu, 26 Jan 2023 11:23:38 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     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, gregkh@...uxfoundation.org,
        Thinh.Nguyen@...opsys.com, broonie@...nel.org,
        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 v2 00/22] Introduce QC USB SND audio offloading
 support

On 26.1.2023 5.14, Wesley Cheng wrote:
> 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
> 

I'll submit the first three patches from that branch myself to usb-next, might modify
them slightly.
Just need to make sure they don't cause regression. Those are changes I want done anyway.

> 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)

Was this solvable by first clearing high 32 bits and then low 32 bits?

Thanks
Mathias