loongarch/reset: use general efi poweroff

Currently efi_shutdown_init can register a general sys_off handler,
efi_power_off, which will be called during do_kernel_power_off and shut
the machine off via efi runtime services. So enable this by providing
efi_poweroff_required, like arm and x86, and prevent directly calling
efi.reset_system in machine_power_off.

Signed-off-by: Miao Wang <[email protected]>

Author: shankerwangmiao

arch/loongarch/kernel/efi.c

@@ -71,6 +71,11 @@ void __init efi_runtime_init(void)
 
 unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
 
+bool efi_poweroff_required(void)
+{
+	return efi_enabled(EFI_RUNTIME_SERVICES);
+}
+
 static void __init init_screen_info(void)
 {
 	struct screen_info *si;

arch/loongarch/kernel/reset.c

@@ -48,9 +48,6 @@ void machine_power_off(void)
 		enable_pci_wakeup();
 #endif
 	do_kernel_power_off();
-#ifdef CONFIG_EFI
-	efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
-#endif
 
 	while (true) {
 		__arch_cpu_idle();