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authorKai-Heng Feng <kai.heng.feng@canonical.com>2019-01-12 03:54:24 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-18 10:02:56 +0100
commit7529b2574a7aaf902f1f8159fbc2a7caa74be559 (patch)
tree2e8415fcc95412fe08bfdc80da1ceb28b137fcac /drivers/usb
parent5f620bb6439ea8f354cfe4c7d47887df9d3acaf0 (diff)
USB: Add new USB LPM helpers
Use new helpers to make LPM enabling/disabling more clear. This is a preparation to subsequent patch. Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Cc: stable <stable@vger.kernel.org> # after much soaking Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/driver.c12
-rw-r--r--drivers/usb/core/hub.c12
-rw-r--r--drivers/usb/core/message.c2
-rw-r--r--drivers/usb/core/sysfs.c5
-rw-r--r--drivers/usb/core/usb.h10
5 files changed, 30 insertions, 11 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 53564386ed57..c276ffc5561f 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1896,7 +1896,7 @@ int usb_runtime_idle(struct device *dev)
return -EBUSY;
}
-int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
+static int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
int ret = -EPERM;
@@ -1913,6 +1913,16 @@ int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
return ret;
}
+int usb_enable_usb2_hardware_lpm(struct usb_device *udev)
+{
+ return usb_set_usb2_hardware_lpm(udev, 1);
+}
+
+int usb_disable_usb2_hardware_lpm(struct usb_device *udev)
+{
+ return usb_set_usb2_hardware_lpm(udev, 0);
+}
+
#endif /* CONFIG_PM */
struct bus_type usb_bus_type = {
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 713ab85332f8..7337e942e9b0 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3252,7 +3252,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
/* disable USB2 hardware LPM */
if (udev->usb2_hw_lpm_enabled == 1)
- usb_set_usb2_hardware_lpm(udev, 0);
+ usb_disable_usb2_hardware_lpm(udev);
if (usb_disable_ltm(udev)) {
dev_err(&udev->dev, "Failed to disable LTM before suspend\n");
@@ -3291,7 +3291,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
err_ltm:
/* Try to enable USB2 hardware LPM again */
if (udev->usb2_hw_lpm_capable == 1)
- usb_set_usb2_hardware_lpm(udev, 1);
+ usb_enable_usb2_hardware_lpm(udev);
if (udev->do_remote_wakeup)
(void) usb_disable_remote_wakeup(udev);
@@ -3575,7 +3575,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
} else {
/* Try to enable USB2 hardware LPM */
if (udev->usb2_hw_lpm_capable == 1)
- usb_set_usb2_hardware_lpm(udev, 1);
+ usb_enable_usb2_hardware_lpm(udev);
/* Try to enable USB3 LTM */
usb_enable_ltm(udev);
@@ -4466,7 +4466,7 @@ static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev)
if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) ||
connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
udev->usb2_hw_lpm_allowed = 1;
- usb_set_usb2_hardware_lpm(udev, 1);
+ usb_enable_usb2_hardware_lpm(udev);
}
}
@@ -5681,7 +5681,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
* It will be re-enabled by the enumeration process.
*/
if (udev->usb2_hw_lpm_enabled == 1)
- usb_set_usb2_hardware_lpm(udev, 0);
+ usb_disable_usb2_hardware_lpm(udev);
/* Disable LPM while we reset the device and reinstall the alt settings.
* Device-initiated LPM, and system exit latency settings are cleared
@@ -5784,7 +5784,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
done:
/* Now that the alt settings are re-installed, enable LTM and LPM. */
- usb_set_usb2_hardware_lpm(udev, 1);
+ usb_enable_usb2_hardware_lpm(udev);
usb_unlocked_enable_lpm(udev);
usb_enable_ltm(udev);
usb_release_bos_descriptor(udev);
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index bfa5eda0cc26..35951aea7f50 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1244,7 +1244,7 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
}
if (dev->usb2_hw_lpm_enabled == 1)
- usb_set_usb2_hardware_lpm(dev, 0);
+ usb_disable_usb2_hardware_lpm(dev);
usb_unlocked_disable_lpm(dev);
usb_disable_ltm(dev);
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index ea18284dfa9a..7e88fdfe3cf5 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -528,7 +528,10 @@ static ssize_t usb2_hardware_lpm_store(struct device *dev,
if (!ret) {
udev->usb2_hw_lpm_allowed = value;
- ret = usb_set_usb2_hardware_lpm(udev, value);
+ if (value)
+ ret = usb_enable_usb2_hardware_lpm(udev);
+ else
+ ret = usb_disable_usb2_hardware_lpm(udev);
}
usb_unlock_device(udev);
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 546a2219454b..d95a5358f73d 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -92,7 +92,8 @@ extern int usb_remote_wakeup(struct usb_device *dev);
extern int usb_runtime_suspend(struct device *dev);
extern int usb_runtime_resume(struct device *dev);
extern int usb_runtime_idle(struct device *dev);
-extern int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable);
+extern int usb_enable_usb2_hardware_lpm(struct usb_device *udev);
+extern int usb_disable_usb2_hardware_lpm(struct usb_device *udev);
#else
@@ -112,7 +113,12 @@ static inline int usb_autoresume_device(struct usb_device *udev)
return 0;
}
-static inline int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
+static inline int usb_enable_usb2_hardware_lpm(struct usb_device *udev)
+{
+ return 0;
+}
+
+static inline int usb_disable_usb2_hardware_lpm(struct usb_device *udev)
{
return 0;
}