linux-kernel - Re: [PATCH v3 0/3] usb: dwc3: parkmode_disable_ss

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Date:   Fri, 21 Feb 2020 10:11:34 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     balbi@...nel.org, khilman@...libre.com
Cc:     linux-usb@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] usb: dwc3: parkmode_disable_ss_quirk on DWC3
 controller

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@...il.com> and confirmed
> by Thinh Nguyen <Thinh.Nguyen@...opsys.com> 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@baylibre.com
> [1] https://lore.kernel.org/linux-amlogic/20200109101535.26812-1-narmstrong@baylibre.com
> 
> 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