platform/x86: toshiba: re-enable acpi hotkeys after suspend to disk

On the Toshiba Tecra Z40, after a suspend-to-disk, some FN hotkeys
driven by toshiba_acpi are not functional.

Calling the ACPI object ENAB on resume makes them back alive.
Signed-off-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: NMatthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: NDarren Hart <dvhart@linux.intel.com>

drivers/platform/x86/toshiba_acpi.c

@@ -1857,9 +1857,16 @@ static int toshiba_acpi_resume(struct device *device)
 {
 	struct toshiba_acpi_dev *dev = acpi_driver_data(to_acpi_device(device));
 	u32 result;
+	acpi_status status;
+
+	if (dev->hotkey_dev) {
+		status = acpi_evaluate_object(dev->acpi_dev->handle, "ENAB",
+				NULL, NULL);
+		if (ACPI_FAILURE(status))
+			pr_info("Unable to re-enable hotkeys\n");
 
-	if (dev->hotkey_dev)
 		hci_write1(dev, HCI_HOTKEY_EVENT, HCI_HOTKEY_ENABLE, &result);
+	}
 
 	return 0;
 }