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Commit 1ff4df56 authored by Andiry Xu's avatar Andiry Xu Committed by Greg Kroah-Hartman
Browse files

usbcore: check device's LPM capability 



Check device's LPM capability by examining the bmAttibutes field of the
USB2.0 Extension Descriptor.

Signed-off-by: default avatarAndiry Xu <andiry.xu@amd.com>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 3148bf04

drivers/usb/core/hub.c

+8 −2
Original line number Diff line number Diff line
@@ -3083,8 +3083,14 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 
		goto fail;

	}



	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201)

		usb_get_bos_descriptor(udev);

	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {

		retval = usb_get_bos_descriptor(udev);

		if (!retval) {

			if (udev->bos->ext_cap && (USB_LPM_SUPPORT &

				le32_to_cpu(udev->bos->ext_cap->bmAttributes)))

					udev->lpm_capable = 1;

		}

	}



	retval = 0;

	/* notify HCD that we have a device connected and addressed */

include/linux/usb.h

+2 −0
Original line number Diff line number Diff line
@@ -410,6 +410,7 @@ struct usb_tt; 
 *	FIXME -- complete doc

 * @authenticated: Crypto authentication passed

 * @wusb: device is Wireless USB

 * @lpm_capable: device supports LPM

 * @string_langid: language ID for strings

 * @product: iProduct string, if present (static)

 * @manufacturer: iManufacturer string, if present (static)
@@ -472,6 +473,7 @@ struct usb_device { 
	unsigned authorized:1;

	unsigned authenticated:1;

	unsigned wusb:1;

	unsigned lpm_capable:1;

	int string_langid;



	/* static strings from the device */