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USB: Add new USB LPM helpers

Browse source 
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>
This commit is contained in:
Kai-Heng Feng 2019-01-12 03:54:24 +08:00 committed by Greg Kroah-Hartman
parent 5f620bb643
commit 7529b2574a
5 changed files with 30 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/usb/core/driver.c
View file

@ -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 = {

12
drivers/usb/core/hub.c
View file

@ -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);

2
drivers/usb/core/message.c
View file

@ -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);

5
drivers/usb/core/sysfs.c
View file

@ -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);

10
drivers/usb/core/usb.h
View file

@ -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;
}