FROMLIST: USB: core: Enable root_hub's remote wakeup for wakeup sources

Now we only enable the remote wakeup function for the USB wakeup source
itself at usb_port_suspend(). But on pre-XHCI controllers this is not
enough to enable the S3 wakeup function for USB keyboards, so we also
enable the root_hub's remote wakeup (and disable it on error). Frankly
this is unnecessary for XHCI, but enable it unconditionally make code
simple and seems harmless.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Link: https://lore.kernel.org/all/20250131100630.342995-1-chenhuacai@loongson.cn/
Signed-off-by: Kexy Biscuit <kexybiscuit@aosc.io>

Author: chenhuacai

drivers/usb/core/hub.c

@@ -3522,6 +3522,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
 			if (PMSG_IS_AUTO(msg))
 				goto err_wakeup;
 		}
+		usb_enable_remote_wakeup(udev->bus->root_hub);
 	}
 
 	/* disable USB2 hardware LPM */
@@ -3585,8 +3586,10 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
 		/* Try to enable USB2 hardware LPM again */
 		usb_enable_usb2_hardware_lpm(udev);
 
-		if (udev->do_remote_wakeup)
+		if (udev->do_remote_wakeup) {
 			(void) usb_disable_remote_wakeup(udev);
+			(void) usb_disable_remote_wakeup(udev->bus->root_hub);
+		}
  err_wakeup:
 
 		/* System sleep transitions should never fail */