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| author |   Thang Q. Nguyen <tqnguyen@apm.com> | 2017-10-05 11:21:37 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-05 11:01:57 +0200 |
| commit | 4750bc78efdb126ddc40f1b34dbae7ce319344cb (patch) | |
| tree | e8beed27b739a1fafe3736d47b579c173f26dd2a /Documentation/devicetree/bindings/usb | |
| parent | usb: gadget: udc: snps_udc_core: use setup_timer() helper. (diff) | |
| download | linux-dev-4750bc78efdb126ddc40f1b34dbae7ce319344cb.tar.xz linux-dev-4750bc78efdb126ddc40f1b34dbae7ce319344cb.zip | |
usb: host: xhci support option to disable the xHCI USB2 HW LPM
XHCI specification 1.1 does not require xHCI-compliant controllers
to always enable hardware USB2 LPM. However, the current xHCI
driver always enable it when seeing HLC=1.
This patch supports an option for users to control disabling
USB2 Hardware LPM via DT/ACPI attribute.
This option is needed in case user would like to disable this
feature. For example, their xHCI controller has its USB2 HW LPM
broken.
Signed-off-by: Tung Nguyen <tunguyen@apm.com>
Signed-off-by: Thang Q. Nguyen <tqnguyen@apm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/devicetree/bindings/usb')
| -rw-r--r-- | Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt index 2d80b60eeabe..ae6e484a8d7c 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-lpm-disable: indicate if we don't want to enable USB2 HW LPM - usb3-lpm-capable: determines if platform is USB3 LPM capable - quirk-broken-port-ped: set if the controller has broken port disable mechanism |