linux-kernel - Re: [PATCH v3] arm64: dts: ls208xa: use a pseudo-bus to constrain usb dma size

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Message-ID: <20231009132455.GE733979@dragon>
Date:   Mon, 9 Oct 2023 21:24:55 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     leoyang.li@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arm64: dts: ls208xa: use a pseudo-bus to constrain
 usb dma size

On Mon, Sep 25, 2023 at 06:10:15PM +0300, Laurentiu Tudor wrote:
> Wrap the usb controllers in an intermediate simple-bus and use it to
> constrain the dma address size of these usb controllers to the 40b
> that they generate toward the interconnect. This is required because
> the SoC uses 48b address sizes and this mismatch would lead to smmu
> context faults [1] because the usb generates 40b addresses while the
> smmu page tables are populated with 48b wide addresses.
> 
> [1]
> xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
> xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1
> xhci-hcd xhci-hcd.0.auto: hcc params 0x0220f66d hci version 0x100 quirks 0x0000000002000010
> xhci-hcd xhci-hcd.0.auto: irq 108, io mem 0x03100000
> xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
> xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2
> xhci-hcd xhci-hcd.0.auto: Host supports USB 3.0 SuperSpeed
> arm-smmu 5000000.iommu: Unhandled context fault: fsr=0x402, iova=0xffffffb000, fsynr=0x0, cbfrsynra=0xc01, cb=3
> 
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>

Applied, thanks!