Message-ID: <1e889754-6492-4c53-27f0-796002d5680c@linux.intel.com>
Date:   Thu, 26 Jan 2023 11:23:38 +0200
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To:     Wesley Cheng <quic_wcheng@quicinc.com>,
        srinivas.kandagatla@linaro.org, mathias.nyman@intel.com,
        perex@perex.cz, lgirdwood@gmail.com, andersson@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, gregkh@linuxfoundation.org,
        Thinh.Nguyen@synopsys.com, broonie@kernel.org,
        bgoswami@quicinc.com, tiwai@suse.com, robh+dt@kernel.org,
        agross@kernel.org
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        alsa-devel@alsa-project.org, devicetree@vger.kernel.org,
        linux-usb@vger.kernel.org, quic_jackp@quicinc.com,
        quic_plai@quicinc.com
References: <20230126031424.14582-1-quic_wcheng@quicinc.com>
From:   Mathias Nyman <mathias.nyman@linux.intel.com>
Subject: Re: [RFC PATCH v2 00/22] Introduce QC USB SND audio offloading
 support
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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