usb: host: xhci support option to disable the xHCI USB2 HW LPM

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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>

...

This commit is contained in:

Thang Q. Nguyen 2017-10-05 11:21:37 +03:00 • committed by Greg Kroah-Hartman

parent fb9bbce6e6

commit 4750bc78ef

4 changed files with 6 additions and 1 deletions

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1

Documentation/devicetree/bindings/usb/usb-xhci.txt

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3

drivers/usb/host/xhci-plat.c

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2

drivers/usb/host/xhci.c

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1

drivers/usb/host/xhci.h

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