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Message-ID: <9606b8db-ab16-763f-f9df-d059dcc4e4d0@quicinc.com>
Date:   Thu, 27 Apr 2023 08:35:33 +0530
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Subject: Re: [PATCH v1 0/6] arm64: qcom: sa8775p: add support for USB
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To:     Konrad Dybcio <konrad.dybcio@linaro.org>,
        Adrien Thierry <athierry@redhat.com>
CC:     <agross@kernel.org>, <andersson@kernel.org>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, Vinod Koul <vkoul@kernel.org>,
        "Kishon Vijay Abraham I" <kishon@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Wesley Cheng <quic_wcheng@quicinc.com>,
        <linux-arm-msm@vger.kernel.org>, <linux-phy@lists.infradead.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-usb@vger.kernel.org>
References: <20230421133922.8520-1-quic_shazhuss@quicinc.com>
 <ZEcEGJiikEC2wIVE@fedora> <ac49075d-439e-da46-9ef6-0b0828f8e072@linaro.org>
From:   Shazad Hussain <quic_shazhuss@quicinc.com>
In-Reply-To: <ac49075d-439e-da46-9ef6-0b0828f8e072@linaro.org>
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On 4/27/2023 5:12 AM, Konrad Dybcio wrote:
> 
> On 4/24/23 23:35, Adrien Thierry wrote:
>> 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@0/a8f8800.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@0/a8f8800.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@0/a8f8800.usb/a800000.usb/xhci-hcd.1.auto/usb1
>>      lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb2 -> 
>> ../../../devices/platform/soc@0/a8f8800.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@0/a8f8800.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@0/a8f8800.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@0/a4f8800.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@0/a8f8800.usb/a800000.usb/xhci-hcd.0.auto/usb1
>>      lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb2 -> 
>> ../../../devices/platform/soc@0/a8f8800.usb/a800000.usb/xhci-hcd.0.auto/usb2
>>      lrwxrwxrwx 1 root root 0 Feb 27 00:00 usb3 -> 
>> ../../../devices/platform/soc@0/a4f8800.usb/a400000.usb/xhci-hcd.1.auto/usb3
>>
>> Have you also encountered this?
> 
> I've had some issues with QMPPHY not (sometimes?) probing in time on 
> SM6115 only when built as a module.. perhaps it'd be worth checking out 
> of it works fine with =y?
> 

In my setup I tried keeping QMPPHY as =y only and did not see the issue

with 10 reboots.
> 
> Konrad
> 
>>
>> Best,
>>
>> Adrien
>>
---
Shazad