diff options
Diffstat (limited to 'drivers/usb/core/driver.c')
| -rw-r--r-- | drivers/usb/core/driver.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 75b4bc0..e1f547e 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1181,6 +1181,19 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) udev->state == USB_STATE_SUSPENDED) goto done; +#ifdef CONFIG_MDM_HSIC_PM + /* when additional device attached at ehci hub, interface driver will + * goes to suspend , but hub will not goes to suspend. + * in hsic case, device modem cannot notice this change on host, so + * it does not try to send packet to host + * + * prevent suspend_both when it's parent has more child + */ + if (udev->dev.parent) { + if (atomic_read(&udev->dev.parent->power.child_count) != 1) + return -EBUSY; + } +#endif /* Suspend all the interfaces and then udev itself */ if (udev->actconfig) { n = udev->actconfig->desc.bNumInterfaces; @@ -1332,6 +1345,9 @@ int usb_resume(struct device *dev, pm_message_t msg) * Unbind the interfaces that will need rebinding later. */ } else { + #ifdef CONFIG_MDM_HSIC_PM + pm_runtime_get_sync(dev->parent); + #endif status = usb_resume_both(udev, msg); if (status == 0) { pm_runtime_disable(dev); @@ -1339,6 +1355,9 @@ int usb_resume(struct device *dev, pm_message_t msg) pm_runtime_enable(dev); do_unbind_rebind(udev, DO_REBIND); } + #ifdef CONFIG_MDM_HSIC_PM + pm_runtime_put_sync(dev->parent); + #endif } /* Avoid PM error messages for devices disconnected while suspended |