diff options
Diffstat (limited to 'drivers/acpi/tables/tbfadt.c')
| -rw-r--r-- | drivers/acpi/tables/tbfadt.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/acpi/tables/tbfadt.c b/drivers/acpi/tables/tbfadt.c index 807c7116e94b..1db833eb2417 100644 --- a/drivers/acpi/tables/tbfadt.c +++ b/drivers/acpi/tables/tbfadt.c @@ -347,6 +347,18 @@ static void acpi_tb_convert_fadt(void) acpi_gbl_xpm1b_enable.space_id = acpi_gbl_FADT.xpm1a_event_block.space_id; } + + /* + * For ACPI 1.0 FADTs, ensure that reserved fields (which should be zero) + * are indeed zero. This will workaround BIOSs that inadvertently placed + * values in these fields. + */ + if (acpi_gbl_FADT.header.revision < 3) { + acpi_gbl_FADT.preferred_profile = 0; + acpi_gbl_FADT.pstate_control = 0; + acpi_gbl_FADT.cst_control = 0; + acpi_gbl_FADT.boot_flags = 0; + } } /****************************************************************************** |