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Date:   Mon, 24 Apr 2023 18:35:04 -0400
From:   Adrien Thierry <athierry@...hat.com>
To:     Shazad Hussain <quic_shazhuss@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v1 0/6] arm64: qcom: sa8775p: add support for USB

Hi Shazad,

On Fri, Apr 21, 2023 at 07:09:15PM +0530, Shazad Hussain wrote:
> Update relavent DT bindings for USB, add new config to the phy driver,
> add USB and PHY nodes to the .dtsi and enable them in the board .dts
> for the sa8775p-ride platform.
> 
> Shazad Hussain (6):
>   dt-bindings: usb: qcom,dwc3: Add bindings for SA8775P
>   dt-bindings: phy: qcom,usb-snps-femto-v2: Add bindings for SA8775P
>   dt-bindings: phy: qcom,sc8280xp-qmp-usb3-uni: Add SA8775P USB PHY
>     binding
>   phy: qcom-qmp: Add SA8775P USB3 UNI phy
>   arm64: dts: qcom: sa8775p: add USB nodes
>   arm64: dts: qcom: sa8775p-ride: enable USB nodes
> 
>  .../phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml   |   1 +
>  .../bindings/phy/qcom,usb-snps-femto-v2.yaml  |   1 +
>  .../devicetree/bindings/usb/qcom,dwc3.yaml    |   5 +
>  arch/arm64/boot/dts/qcom/sa8775p-ride.dts     |  92 +++++++
>  arch/arm64/boot/dts/qcom/sa8775p.dtsi         | 239 +++++++++++++++++-
>  drivers/phy/qualcomm/phy-qcom-qmp-usb.c       |  45 ++++
>  6 files changed, 381 insertions(+), 2 deletions(-)
> 
> -- 
> 2.17.1
> 

Thanks for posting this. I tested the series on the sa8775p, and it seems
initialization for the controller at a400000 sometimes fails with a
timeout (-110) error:

    dwc3 a400000.usb: Adding to iommu group 2
    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: can't setup: -110
    xhci-hcd xhci-hcd.0.auto: USB bus 1 deregistered
    xhci-hcd: probe of xhci-hcd.0.auto failed with error -110
    dwc3 a600000.usb: Adding to iommu group 3
    dwc3 a800000.usb: Adding to iommu group 4
    xhci-hcd xhci-hcd.1.auto: xHCI Host Controller
    xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 1
    xhci-hcd xhci-hcd.1.auto: hcc params 0x0110ffc5 hci version 0x110 quirks 0x0000000000010010
    xhci-hcd xhci-hcd.1.auto: irq 162, io mem 0x0a800000
    xhci-hcd xhci-hcd.1.auto: xHCI Host Controller
    xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 2
    xhci-hcd xhci-hcd.1.auto: Host supports USB 3.1 Enhanced SuperSpeed
    hub 1-0:1.0: USB hub found
    hub 1-0:1.0: 1 port detected
    usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
    hub 2-0:1.0: USB hub found
    hub 2-0:1.0: 1 port detected

In this case, only usb devices for a800000 are showing:

    dracut:/# ls -alh /sys/bus/usb/devices
    total 0
    drwxr-xr-x 2 root root 0 Feb 27 00:00 .
    drwxr-xr-x 4 root root 0 Feb 27 00:00 ..
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 1-0:1.0 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.1.auto/usb1/1-0:1.0
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 2-0:1.0 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.1.auto/usb2/2-0:1.0
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb1 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.1.auto/usb1
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb2 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.1.auto/usb2

This happens approximately 1 out of 2 reboots. Here's the kernel output
when initialization succeeds:

    dwc3 a600000.usb: Adding to iommu group 2
    dwc3 a800000.usb: Adding to iommu group 3
    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 0x0110ffc5 hci version 0x110 quirks 0x0000000000010010
    xhci-hcd xhci-hcd.0.auto: irq 161, io mem 0x0a800000
    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 3.1 Enhanced SuperSpeed
    hub 1-0:1.0: USB hub found
    hub 1-0:1.0: 1 port detected
    usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
    hub 2-0:1.0: USB hub found
    hub 2-0:1.0: 1 port detected
    dwc3 a400000.usb: Adding to iommu group 4
    xhci-hcd xhci-hcd.1.auto: xHCI Host Controller
    xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 3
    xhci-hcd xhci-hcd.1.auto: USB3 root hub has no ports
    xhci-hcd xhci-hcd.1.auto: hcc params 0x0220fe65 hci version 0x110 quirks 0x0000000000010010
    xhci-hcd xhci-hcd.1.auto: irq 162, io mem 0x0a400000
    hub 3-0:1.0: USB hub found
    hub 3-0:1.0: 1 port detected

And the list of usb devices:

    dracut:/# ls -alh /sys/bus/usb/devices
    total 0
    drwxr-xr-x 2 root root 0 Feb 27 00:00 .
    drwxr-xr-x 4 root root 0 Feb 27 00:00 ..
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 1-0:1.0 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.0.auto/usb1/1-0:1.0
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 2-0:1.0 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.0.auto/usb2/2-0:1.0
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 3-0:1.0 -> ../../../devices/platform/soc@...4f8800.usb/a400000.usb/xhci-hcd.1.auto/usb3/3-0:1.0
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb1 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.0.auto/usb1
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb2 -> ../../../devices/platform/soc@...8f8800.usb/a800000.usb/xhci-hcd.0.auto/usb2
    lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb3 -> ../../../devices/platform/soc@...4f8800.usb/a400000.usb/xhci-hcd.1.auto/usb3

Have you also encountered this?

Best,

Adrien

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