linux-kernel - Re: [v2 1/1] usb:host:xhci support option to disable xHCI 1.0 USB2 HW LPM

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Date:   Tue, 30 May 2017 17:32:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Thang Q. Nguyen" <tqnguyen@....com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Phong Vo <pvo@....com>,
        Loc Ho <lho@....com>, Duc Tran <dxtran@....com>,
        Quang Han <qhan@....com>, Tung Nguyen <tunguyen@....com>,
        patches@....com
Subject: Re: [v2 1/1] usb:host:xhci support option to disable xHCI 1.0 USB2
 HW LPM

On Sat, May 20, 2017 at 02:24:56PM +0700, Thang Q. Nguyen wrote:
> XHCI specification 1.1 does not require xHCI 1.0 compliant controllers
> to always enable hardware USB2 LPM.
> However, the current xHCI driver always enable it by setting HLE=1 when
> seeing HLC=1. This makes certain xHCI controllers that have broken USB2
> HW LPM fail to work as there is no way to disable this feature.
> This patch adds support to control disabling USB2 Hardware LPM via
> DT/ACPI attribute.
> 
> Signed-off-by: Tung Nguyen <tunguyen@....com>
> Signed-off-by: Thang Q. Nguyen <tqnguyen@....com>
> ---
> Changes since v1:
>  - Update DT/ACPI attribute and corresponding codes from HLE to LPM to
>   be consistent with other attribute names.
> ---
>  Documentation/devicetree/bindings/usb/usb-xhci.txt |    1 +

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/usb/host/xhci-plat.c                       |    3 +++
>  drivers/usb/host/xhci.c                            |    7 ++++++-
>  drivers/usb/host/xhci.h                            |    1 +
>  4 files changed, 11 insertions(+), 1 deletions(-)