diff options
| author | Xenia Ragiadakou <burzalodowa@gmail.com> | 2013-08-31 18:09:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-20 12:31:40 -0800 |
| commit | 1e7c2cd28dc4ea3a86266fcfd07700e3911716a5 (patch) | |
| tree | 165fbe389b3d649e16656d0aa0b98798678de285 | |
| parent | a35bbad6526cf3de01a4344b3c36d5e1e292bbd1 (diff) | |
| download | lwn-1e7c2cd28dc4ea3a86266fcfd07700e3911716a5.tar.gz lwn-1e7c2cd28dc4ea3a86266fcfd07700e3911716a5.zip | |
usbcore: set lpm_capable field for LPM capable root hubs
commit 9df89d85b407690afa46ddfbccc80bec6869971d upstream.
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>
| -rw-r--r-- | drivers/usb/core/hcd.c | 1 | ||||
| -rw-r--r-- | drivers/usb/core/hub.c | 7 | ||||
| -rw-r--r-- | drivers/usb/core/usb.h | 1 |
3 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 014dc996b4f6..7b8bc0bdc5da 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -1035,6 +1035,7 @@ 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); diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index cd98cce4dbd0..1c110891fac0 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -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; diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 823857767a16..c49383669cd8 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -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); |