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authorAndiry Xu <andiry.xu@amd.com>2011-09-23 14:19:48 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-09-26 15:51:08 -0700
commit1ff4df56846d10379939166713bb2908e6a5ee0e (patch)
treea2cacc55c0496016be4a44f72b96a0717ba91948 /drivers/usb/core/hub.c
parent3148bf041d169a083aa31bd69bedd5bfb7ffe215 (diff)
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: 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>
Diffstat (limited to 'drivers/usb/core/hub.c')
-rw-r--r--drivers/usb/core/hub.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 7a2514322bf..4ffc3d1bd9e 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -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 */