Check device's LPM capability by examining the bmAttibutes field of the
USB2.0 Extension Descriptor.
Signed-off-by: Andiry Xu <andiry.xu@xxxxxxx>
---
drivers/usb/core/hub.c | 10 ++++++++--
include/linux/usb.h | 2 ++
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 8a83656..1a98cb8 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3047,8 +3047,14 @@ 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 */
diff --git a/include/linux/usb.h b/include/linux/usb.h
index cfd571b..cf13924 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -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 */
--
1.7.1
--
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