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usb: add usb2 Link PM variables to sysfs and usb_device

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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>
This commit is contained in:
Mathias Nyman
2013-05-23 17:14:31 +03:00
committed by Sarah Sharp
parent a558ccdcc7
commit 17f34867e9
4 changed files with 103 additions and 2 deletions
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18
include/linux/usb.h
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@@ -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;