usb: dwc3: pci: runtime_resume child device

During runtime_resume of dwc3-pci.c, we need to
runtime suspend our child device (which is dwc3
proper) otherwise nothing will happen.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/dwc3-pci.c

@@ -243,6 +243,13 @@ static int dwc3_pci_runtime_suspend(struct device *dev)
 	return -EBUSY;
 }
 
+static int dwc3_pci_runtime_resume(struct device *dev)
+{
+	struct platform_device *dwc3 = dev_get_drvdata(dev);
+
+	return pm_runtime_get(&dwc3->dev);
+}
+
 static int dwc3_pci_pm_dummy(struct device *dev)
 {
 	/*
@@ -259,7 +266,7 @@ static int dwc3_pci_pm_dummy(struct device *dev)
 
 static struct dev_pm_ops dwc3_pci_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_pm_dummy, dwc3_pci_pm_dummy)
-	SET_RUNTIME_PM_OPS(dwc3_pci_runtime_suspend, dwc3_pci_pm_dummy,
+	SET_RUNTIME_PM_OPS(dwc3_pci_runtime_suspend, dwc3_pci_runtime_resume,
 		NULL)
 };