From 17f34867e98d2fb0c03918faab79efb989fa134b Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Thu, 23 May 2013 17:14:31 +0300 Subject: 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 Signed-off-by: Sarah Sharp --- include/linux/usb.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/linux/usb.h') 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 @@ -393,6 +393,22 @@ enum usb_port_connect_type { USB_PORT_NOT_USED, }; +/* + * 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. * @@ -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; -- cgit v1.2.3