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authorMathias Nyman <mathias.nyman@linux.intel.com>2013-05-23 18:14:31 +0400
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2013-06-06 03:48:40 +0400
commit17f34867e98d2fb0c03918faab79efb989fa134b (patch)
tree1ea3f266473f6d6aa7fec9a646e04158941d0a06 /include/linux/usb.h
parenta558ccdcc71c7770c5e80c926a31cfe8a3892a09 (diff)
downloadlinux-17f34867e98d2fb0c03918faab79efb989fa134b.tar.xz
usb: add usb2 Link PM variables to sysfs and usb_device
Adds abitilty to tune L1 timeout (inactivity timer for usb2 link sleep) and BESL (best effort service latency)via sysfs. This also adds a new usb2_lpm_parameters structure with those variables to struct usb_device. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'include/linux/usb.h')
-rw-r--r--include/linux/usb.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index fe444989668a..a232b7ece1f6 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -394,6 +394,22 @@ enum usb_port_connect_type {
};
/*
+ * USB 2.0 Link Power Management (LPM) parameters.
+ */
+struct usb2_lpm_parameters {
+ /* Best effort service latency indicate how long the host will drive
+ * resume on an exit from L1.
+ */
+ unsigned int besl;
+
+ /* Timeout value in microseconds for the L1 inactivity (LPM) timer.
+ * When the timer counts to zero, the parent hub will initiate a LPM
+ * transition to L1.
+ */
+ int timeout;
+};
+
+/*
* USB 3.0 Link Power Management (LPM) parameters.
*
* PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit.
@@ -488,6 +504,7 @@ struct usb3_lpm_parameters {
* specific data for the device.
* @slot_id: Slot ID assigned by xHCI
* @removable: Device can be physically removed from this port
+ * @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout.
* @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout.
* @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout.
* @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm()
@@ -568,6 +585,7 @@ struct usb_device {
struct wusb_dev *wusb_dev;
int slot_id;
enum usb_device_removable removable;
+ struct usb2_lpm_parameters l1_params;
struct usb3_lpm_parameters u1_params;
struct usb3_lpm_parameters u2_params;
unsigned lpm_disable_count;