On Sat, May 13, 2017 at 07:13:14AM +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@xxxxxxx> > Signed-off-by: Thang Q. Nguyen <tqnguyen@xxxxxxx> > --- > Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 + > 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(-) > > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt > index 2d80b60..b5da569 100644 > --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt > +++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt > @@ -26,6 +26,7 @@ Required properties: > > Optional properties: > - clocks: reference to a clock > + - usb2-hle-disable: disable USB2 LPM for hardware does not support it > - usb3-lpm-capable: determines if platform is USB3 LPM capable Can we have some consistency in the naming of these 2 properties? At least use 'lpm' rather than 'hle'. I don't recall why the 2nd one is not default enabled, but that would make more sense. > - quirk-broken-port-ped: set if the controller has broken port disable mechanism > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
