linux-kernel - Re: usb:xhci: support disable usb2 LPM Remote Wakeup

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Date:   Fri, 9 Dec 2016 15:36:29 -0600
From:   Rob Herring <robh@...nel.org>
To:     "Thang Q. Nguyen" <tqnguyen@....com>
Cc:     Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, Phong Vo <pvo@....com>,
        Loc Ho <lho@....com>, Vu Nguyen <vnguyen@....com>,
        patches@....com
Subject: Re: usb:xhci: support disable usb2 LPM Remote Wakeup

On Sun, Dec 04, 2016 at 07:42:01PM +0700, Thang Q. Nguyen wrote:
> From: Thang Nguyen <tqnguyen@....com>
> 
> As per USB 2.0 link power management addendum ECN, table 1-2, page 4,
> device or host initiated via resume signaling; device-initiated resumes
> can be optionally enabled/disabled by software. This patch adds support
> to control enabling the USB2 RWE feature via DT/ACPI attribute.
> 
> Signed-off-by: Vu Nguyen <vnguyen@....com>
> Signed-off-by: Thang Nguyen <tqnguyen@....com>
> ---
>  Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 +
>  drivers/usb/host/xhci-plat.c                       | 3 +++
>  drivers/usb/host/xhci.c                            | 5 ++++-
>  drivers/usb/host/xhci.h                            | 1 +
>  4 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
> index 966885c..9b4cd14 100644
> --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
> @@ -25,6 +25,7 @@ Required properties:
>  
>  Optional properties:
>    - clocks: reference to a clock
> +  - usb2-rwe-disable: disable USB2 LPM Remote Wakeup capable

Remote wakeup has been around since USB 1.0 days. Does this need to be 
USB2 or XHCI specific?

>    - usb3-lpm-capable: determines if platform is USB3 LPM capable
>  
>  Example: