On 19/02/2020 15:18, Neil Armstrong wrote: > 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" > > The bug has been reproduced by Jun Li <lijun.kernel@xxxxxxxxx> and confirmed > by Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> with the explanation: >> 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. > > Changes since v2 at [2]: > - rebased on v5.6-rc2 > > Changes since v1 at [1]: > - added rob review tag > - added Thinh Nguyen in commit log > > [1] https://lore.kernel.org/linux-amlogic/20191014141718.22603-1-narmstrong@xxxxxxxxxxxx > [1] https://lore.kernel.org/linux-amlogic/20200109101535.26812-1-narmstrong@xxxxxxxxxxxx > > Neil Armstrong (3): > doc: dt: bindings: usb: dwc3: Update entries for disabling SS > instances in park mode > usb: dwc3: gadget: Add support for disabling SS instances in park mode > arm64: dts: g12-common: add parkmode_disable_ss_quirk on DWC3 > controller > > Documentation/devicetree/bindings/usb/dwc3.txt | 2 ++ > arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi | 1 + > drivers/usb/dwc3/core.c | 5 +++++ > drivers/usb/dwc3/core.h | 4 ++++ > 4 files changed, 12 insertions(+) > Please ignore this serie, the patch 3 subject is wrong. Neil
