[B] [PATCH 1/2] USB: Add new USB LPM helpers

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1812812

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 at canonical.com>
Cc: stable <stable at vger.kernel.org> # after much soaking
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
(backported from commit 7529b2574a7aaf902f1f8159fbc2a7caa74be559 linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/usb/core/driver.c  | 12 +++++++++++-
 drivers/usb/core/hub.c     | 12 ++++++------
 drivers/usb/core/message.c |  2 +-
 drivers/usb/core/sysfs.c   |  5 ++++-
 drivers/usb/core/usb.h     | 10 ++++++++--
 5 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 5d3408010112..f3ba386a2acd 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1899,7 +1899,7 @@ 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;
@@ -1916,6 +1916,16 @@ 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 91c895f41fd0..f929f4b5fd75 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3167,7 +3167,7 @@ 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.");
@@ -3206,7 +3206,7 @@ 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);
@@ -3486,7 +3486,7 @@ 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);
@@ -4335,7 +4335,7 @@ 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);
 	}
 }
 
@@ -5493,7 +5493,7 @@ 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
@@ -5596,7 +5596,7 @@ 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 a4025760dd84..576a3bd72f85 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1218,7 +1218,7 @@ 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 27bb34043053..91a2e79cabda 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -508,7 +508,10 @@ 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 bb95f98fe48c..2b8012339908 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -91,7 +91,8 @@ 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
 
@@ -111,7 +112,12 @@ 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;
 }
-- 
2.17.1