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usbcore: set lpm_capable field for LPM capable root hubs 

This patch sets the lpm_capable field for root hubs with LPM capabilities.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Reported-by: Martin MOKREJS <mmokrejs@gmail.com>
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Xenia Ragiadakou 2013-08-31 18:09:12 +03:00 committed by Greg Kroah-Hartman
parent 6c74dada4f
commit 9df89d85b4
3 changed files with 8 additions and 1 deletions
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1
drivers/usb/core/hcd.c
View File

@ -1033,6 +1033,7 @@ static int register_root_hub(struct usb_hcd *hcd)
dev_name(&usb_dev->dev), retval);
return retval;
}
usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev);
}
retval = usb_new_device (usb_dev);

7
drivers/usb/core/hub.c
View File

@ -135,7 +135,7 @@ struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev)
return usb_get_intfdata(hdev->actconfig->interface[0]);
}
static int usb_device_supports_lpm(struct usb_device *udev)
int usb_device_supports_lpm(struct usb_device *udev)
{
/* USB 2.1 (and greater) devices indicate LPM support through
* their USB 2.0 Extended Capabilities BOS descriptor.
@ -156,6 +156,11 @@ static int usb_device_supports_lpm(struct usb_device *udev)
"Power management will be impacted.\n");
return 0;
}
/* udev is root hub */
if (!udev->parent)
return 1;
if (udev->parent->lpm_capable)
return 1;

1
drivers/usb/core/usb.h
View File

@ -35,6 +35,7 @@ extern int usb_get_device_descriptor(struct usb_device *dev,
unsigned int size);
extern int usb_get_bos_descriptor(struct usb_device *dev);
extern void usb_release_bos_descriptor(struct usb_device *dev);
extern int usb_device_supports_lpm(struct usb_device *udev);
extern char *usb_cache_string(struct usb_device *udev, int index);
extern int usb_set_configuration(struct usb_device *dev, int configuration);
extern int usb_choose_configuration(struct usb_device *udev);