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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-16 16:58:30 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-16 16:58:30 -0700
commit6470cbc486652942dcf6c4b6420e3a521e766bbf (patch)
tree3244e6e1998031ac17e12283b2f797e60743d93b /drivers/usb/core
parent43fe3a99d9caf10b25f9c596e9854cdae30db418 (diff)
parent024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb (diff)
Merge tag 'for-usb-next-2012-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci into usb-next
USB: Link PM fixes and Latency Tolerance Messaging Hi Greg, Here's four bug fix patches for Link PM (LPM), which are marked for 3.5-stable. There's also three patches that turn on Latency Tolerance Messaging (LTM) for xHCI host controllers and USB 3.0 devices that support this low power feature. Please queue for 3.6. Sarah Sharp
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/hub.c100
-rw-r--r--drivers/usb/core/message.c11
-rw-r--r--drivers/usb/core/sysfs.c10
-rw-r--r--drivers/usb/core/usb.c1
4 files changed, 102 insertions, 20 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 9e900f9a2ef..3febe54883b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2614,6 +2614,50 @@ static int check_port_resume_type(struct usb_device *udev,
return status;
}
+int usb_disable_ltm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ /* Check if the roothub and device supports LTM. */
+ if (!usb_device_supports_ltm(hcd->self.root_hub) ||
+ !usb_device_supports_ltm(udev))
+ return 0;
+
+ /* Clear Feature LTM Enable can only be sent if the device is
+ * configured.
+ */
+ if (!udev->actconfig)
+ return 0;
+
+ return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+}
+EXPORT_SYMBOL_GPL(usb_disable_ltm);
+
+void usb_enable_ltm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ /* Check if the roothub and device supports LTM. */
+ if (!usb_device_supports_ltm(hcd->self.root_hub) ||
+ !usb_device_supports_ltm(udev))
+ return;
+
+ /* Set Feature LTM Enable can only be sent if the device is
+ * configured.
+ */
+ if (!udev->actconfig)
+ return;
+
+ usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+}
+EXPORT_SYMBOL_GPL(usb_enable_ltm);
+
#ifdef CONFIG_USB_SUSPEND
/*
@@ -2709,6 +2753,11 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
if (udev->usb2_hw_lpm_enabled == 1)
usb_set_usb2_hardware_lpm(udev, 0);
+ if (usb_disable_ltm(udev)) {
+ dev_err(&udev->dev, "%s Failed to disable LTM before suspend\n.",
+ __func__);
+ return -ENOMEM;
+ }
if (usb_unlocked_disable_lpm(udev)) {
dev_err(&udev->dev, "%s Failed to disable LPM before suspend\n.",
__func__);
@@ -2738,7 +2787,8 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
if (udev->usb2_hw_lpm_capable == 1)
usb_set_usb2_hardware_lpm(udev, 1);
- /* Try to enable USB3 LPM again */
+ /* Try to enable USB3 LTM and LPM again */
+ usb_enable_ltm(udev);
usb_unlocked_enable_lpm(udev);
/* System sleep transitions should never fail */
@@ -2939,7 +2989,8 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
if (udev->usb2_hw_lpm_capable == 1)
usb_set_usb2_hardware_lpm(udev, 1);
- /* Try to enable USB3 LPM */
+ /* Try to enable USB3 LTM and LPM */
+ usb_enable_ltm(udev);
usb_unlocked_enable_lpm(udev);
}
@@ -3492,6 +3543,15 @@ EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
void usb_unlocked_enable_lpm(struct usb_device *udev) { }
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
+
+int usb_disable_ltm(struct usb_device *udev)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_disable_ltm);
+
+void usb_enable_ltm(struct usb_device *udev) { }
+EXPORT_SYMBOL_GPL(usb_enable_ltm);
#endif
@@ -4675,6 +4735,23 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
}
parent_hub = hdev_to_hub(parent_hdev);
+ /* Disable LPM and LTM while we reset the device and reinstall the alt
+ * settings. Device-initiated LPM settings, and system exit latency
+ * settings are cleared when the device is reset, so we have to set
+ * them up again.
+ */
+ ret = usb_unlocked_disable_lpm(udev);
+ if (ret) {
+ dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__);
+ goto re_enumerate;
+ }
+ ret = usb_disable_ltm(udev);
+ if (ret) {
+ dev_err(&udev->dev, "%s Failed to disable LTM\n.",
+ __func__);
+ goto re_enumerate;
+ }
+
set_bit(port1, parent_hub->busy_bits);
for (i = 0; i < SET_CONFIG_TRIES; ++i) {
@@ -4702,22 +4779,11 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
goto done;
mutex_lock(hcd->bandwidth_mutex);
- /* Disable LPM while we reset the device and reinstall the alt settings.
- * Device-initiated LPM settings, and system exit latency settings are
- * cleared when the device is reset, so we have to set them up again.
- */
- ret = usb_disable_lpm(udev);
- if (ret) {
- dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__);
- mutex_unlock(hcd->bandwidth_mutex);
- goto done;
- }
ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
if (ret < 0) {
dev_warn(&udev->dev,
"Busted HC? Not enough HCD resources for "
"old configuration.\n");
- usb_enable_lpm(udev);
mutex_unlock(hcd->bandwidth_mutex);
goto re_enumerate;
}
@@ -4729,7 +4795,6 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
dev_err(&udev->dev,
"can't restore configuration #%d (error=%d)\n",
udev->actconfig->desc.bConfigurationValue, ret);
- usb_enable_lpm(udev);
mutex_unlock(hcd->bandwidth_mutex);
goto re_enumerate;
}
@@ -4768,17 +4833,18 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
desc->bInterfaceNumber,
desc->bAlternateSetting,
ret);
- usb_unlocked_enable_lpm(udev);
goto re_enumerate;
}
}
- /* Now that the alt settings are re-installed, enable LPM. */
- usb_unlocked_enable_lpm(udev);
done:
+ /* Now that the alt settings are re-installed, enable LTM and LPM. */
+ usb_unlocked_enable_lpm(udev);
+ usb_enable_ltm(udev);
return 0;
re_enumerate:
+ /* LPM state doesn't matter when we're about to destroy the device. */
hub_port_logical_disconnect(parent_hub, port1);
return -ENODEV;
}
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 8b9d669e378..0ab7da2283e 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1174,6 +1174,8 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
put_device(&dev->actconfig->interface[i]->dev);
dev->actconfig->interface[i] = NULL;
}
+ usb_unlocked_disable_lpm(dev);
+ usb_disable_ltm(dev);
dev->actconfig = NULL;
if (dev->state == USB_STATE_CONFIGURED)
usb_set_device_state(dev, USB_STATE_ADDRESS);
@@ -1792,14 +1794,15 @@ free_interfaces:
* installed, so that the xHCI driver can recalculate the U1/U2
* timeouts.
*/
- if (usb_disable_lpm(dev)) {
+ if (dev->actconfig && usb_disable_lpm(dev)) {
dev_err(&dev->dev, "%s Failed to disable LPM\n.", __func__);
mutex_unlock(hcd->bandwidth_mutex);
return -ENOMEM;
}
ret = usb_hcd_alloc_bandwidth(dev, cp, NULL, NULL);
if (ret < 0) {
- usb_enable_lpm(dev);
+ if (dev->actconfig)
+ usb_enable_lpm(dev);
mutex_unlock(hcd->bandwidth_mutex);
usb_autosuspend_device(dev);
goto free_interfaces;
@@ -1819,7 +1822,7 @@ free_interfaces:
if (!cp) {
usb_set_device_state(dev, USB_STATE_ADDRESS);
usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL);
- usb_enable_lpm(dev);
+ /* Leave LPM disabled while the device is unconfigured. */
mutex_unlock(hcd->bandwidth_mutex);
usb_autosuspend_device(dev);
goto free_interfaces;
@@ -1877,6 +1880,8 @@ free_interfaces:
/* Now that the interfaces are installed, re-enable LPM. */
usb_unlocked_enable_lpm(dev);
+ /* Enable LTM if it was turned off by usb_disable_device. */
+ usb_enable_ltm(dev);
/* Now that all the interfaces are set up, register them
* to trigger binding of drivers to interfaces. probe()
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 777f03c3772..682e8256b95 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -253,6 +253,15 @@ show_removable(struct device *dev, struct device_attribute *attr, char *buf)
}
static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
+static ssize_t
+show_ltm_capable(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ if (usb_device_supports_ltm(to_usb_device(dev)))
+ return sprintf(buf, "%s\n", "yes");
+ return sprintf(buf, "%s\n", "no");
+}
+static DEVICE_ATTR(ltm_capable, S_IRUGO, show_ltm_capable, NULL);
+
#ifdef CONFIG_PM
static ssize_t
@@ -649,6 +658,7 @@ static struct attribute *dev_attrs[] = {
&dev_attr_authorized.attr,
&dev_attr_remove.attr,
&dev_attr_removable.attr,
+ &dev_attr_ltm_capable.attr,
NULL,
};
static struct attribute_group dev_attr_grp = {
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 25d0c61c3f8..cd8fb44a3e1 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -396,6 +396,7 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
dev->dev.dma_mask = bus->controller->dma_mask;
set_dev_node(&dev->dev, dev_to_node(bus->controller));
dev->state = USB_STATE_ATTACHED;
+ dev->lpm_disable_count = 1;
atomic_set(&dev->urbnum, 0);
INIT_LIST_HEAD(&dev->ep0.urb_list);