xHCI: set USB2 hardware LPM
If the device pass the USB2 software LPM and the host supports hardware
LPM, enable hardware LPM for the device to let the host decide when to
put the link into lower power state.
If hardware LPM is enabled for a port and driver wants to put it into
suspend, it must first disable hardware LPM, resume the port into U0,
and then suspend the port.
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 0d023cd..3888778 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -82,6 +82,7 @@
extern int usb_runtime_suspend(struct device *dev);
extern int usb_runtime_resume(struct device *dev);
extern int usb_runtime_idle(struct device *dev);
+extern int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable);
#else
@@ -96,6 +97,10 @@
return 0;
}
+static inline int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
+{
+ return 0;
+}
#endif
extern struct bus_type usb_bus_type;