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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2012-06-25 12:08:08 -0700
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2012-07-11 07:06:48 -0400
commitf74631e3426474183389e55f703797bd965cd356 (patch)
tree5243c755fdd3604d4be4c4cf38df640a47fae80f /include/linux/usb.h
parentaf3a23ef4e5fbaf33f0afdda7d26442f036ba795 (diff)
USB: Enable Latency Tolerance Messaging (LTM).
USB 3.0 devices may optionally support a new feature called Latency Tolerance Messaging. If both the xHCI host controller and the device support LTM, it should be turned on in order to give the system hardware a better clue about the latency tolerance values of its PCI devices. Once a Set Feature request to enable LTM is received, the USB 3.0 device will begin to send LTM updates as its buffers fill or empty, and it can tolerate more or less latency. The USB 3.0 spec, section C.4.2 says that LTM should be disabled just before the device is placed into suspend. Then the device will send an updated LTM notification, so that the system doesn't think it should remain in an active state in order to satisfy the latency requirements of the suspended device. The Set and Clear Feature LTM enable command can only be sent to a configured device. The device will respond with an error if that command is sent while it is in the Default or Addressed state. Make sure to check udev->actconfig in usb_enable_ltm() and usb_disable_ltm(), and don't send those commands when the device is unconfigured. LTM should be enabled once a new configuration is installed in usb_set_configuration(). If we end up sending duplicate Set Feature LTM Enable commands on a switch from one installed configuration to another configuration, that should be harmless. Make sure that LTM is disabled before the device is unconfigured in usb_disable_device(). If no drivers are bound to the device, it doesn't make sense to allow the device to control the latency tolerance of the xHCI host controller. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'include/linux/usb.h')
-rw-r--r--include/linux/usb.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index dea2f0de063e..f29831bad235 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -633,6 +633,9 @@ extern void usb_enable_lpm(struct usb_device *udev);
extern int usb_unlocked_disable_lpm(struct usb_device *udev);
extern void usb_unlocked_enable_lpm(struct usb_device *udev);
+extern int usb_disable_ltm(struct usb_device *udev);
+extern void usb_enable_ltm(struct usb_device *udev);
+
/*-------------------------------------------------------------------------*/
/* for drivers using iso endpoints */