Neil Armstrong <narmstrong@xxxxxxxxxxxx> 于2020年2月19日周三 下午10:18写道： > > In certain circumstances, the XHCI SuperSpeed instance in park mode > can fail to recover, thus on Amlogic G12A/G12B/SM1 SoCs when there is high > load on the single XHCI SuperSpeed instance, the controller can crash like: > xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command. > xhci-hcd xhci-hcd.0.auto: Host halt failed, -110 > xhci-hcd xhci-hcd.0.auto: xHCI host controller not responding, assume dead > xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command. > hub 2-1.1:1.0: hub_ext_port_status failed (err = -22) > xhci-hcd xhci-hcd.0.auto: HC died; cleaning up > usb 2-1.1-port1: cannot reset (err = -22) > > Setting the PARKMODE_DISABLE_SS bit in the DWC3_USB3_GUCTL1 mitigates > the issue. The bit is described as : > "When this bit is set to '1' all SS bus instances in park mode are disabled" > > Synopsys explains in [1]: > The GUCTL1.PARKMODE_DISABLE_SS is only available in > dwc_usb3 controller running in host mode. > This should not be set for other IPs. > This can be disabled by default based on IP, but I recommend to have a > property to enable this feature for devices that need this. > > [1] https://lore.kernel.org/linux-usb/45212db9-e366-2669-5c0a-3c5bd06287f6@xxxxxxxxxxxx This is not for gadget, patch title should be: usb: dwc3: core: add support... Li Jun
