As per note in 5.2.9 Fixed ACPI Description Table (FADT) chapter of ACPI specification OSPM will ignore fields related to the ACPI HW register interface, one of which is SCI_INT.
Follow the spec and ignore any configuration done for interrupt line defined by SCI_INT if FADT specifies HW reduced platform. HW reduced platform would be still able to use SCI in case it provides an override record in MADT table. Signed-off-by: Andy Shevchenko <[email protected]> --- arch/x86/kernel/acpi/boot.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 6302a931fe9b..290b6f5a2d50 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1212,8 +1212,9 @@ static int __init acpi_parse_madt_ioapic_entries(void) /* * If BIOS did not supply an INT_SRC_OVR for the SCI * pretend we got one so we can set the SCI flags. + * But ignore setting up SCI on hardware reduced platforms. */ - if (acpi_sci_override_gsi == INVALID_ACPI_IRQ) + if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware) acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0, acpi_gbl_FADT.sci_interrupt); -- 2.15.1
