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LoongArch: Enable general EFI poweroff method

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commit e688c22073 upstream.

efi_shutdown_init() can register a general sys_off handler named
efi_power_off(). Enable this by providing efi_poweroff_required(),
like arm and x86. Since EFI poweroff is also supported on LoongArch,
and the enablement makes the poweroff function usable for hardwares
which lack ACPI S5.

We prefer ACPI poweroff rather than EFI poweroff (like x86), so we only
require EFI poweroff if acpi_gbl_reduced_hardware or acpi_no_s5 is true.

Cc: stable@vger.kernel.org
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Miao Wang <shankerwangmiao@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miao Wang 2024-08-07 17:37:11 +08:00 committed by Greg Kroah-Hartman
parent b4542a5de2
commit 0a993247a9
1 changed files with 6 additions and 0 deletions
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6
arch/loongarch/kernel/efi.c
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@ -66,6 +66,12 @@ void __init efi_runtime_init(void)
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
}
bool efi_poweroff_required(void)
{
return efi_enabled(EFI_RUNTIME_SERVICES) &&
(acpi_gbl_reduced_hardware || acpi_no_s5);
}
unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
#if defined(CONFIG_SYSFB) || defined(CONFIG_EFI_EARLYCON)