Re: [PATCH v1 0/6] arm64: qcom: sa8775p: add support for USB

Adrien Thierry
2023-04-24T22:36:23Z

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?

Best,

Adrien