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. Signed-off-by: Andy Shevchenko <[email protected]> --- arch/x86/kernel/acpi/boot.c | 4 ++-- drivers/acpi/bus.c | 2 +- drivers/acpi/osl.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 71c0feae60a4..c767efa53ee0 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -489,7 +489,7 @@ acpi_parse_int_src_ovr(struct acpi_subtable_header * header, acpi_table_print_madt_entry(header); - if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) { + if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt && !acpi_gbl_reduced_hardware) { acpi_sci_ioapic_setup(intsrc->source_irq, intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2, @@ -1184,7 +1184,7 @@ 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. */ - if (!acpi_sci_override_gsi) + if (!acpi_sci_override_gsi && !acpi_gbl_reduced_hardware) acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0, acpi_gbl_FADT.sci_interrupt); diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index af74b420ec83..1f3dde3bc8f8 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -1035,7 +1035,7 @@ void __init acpi_early_init(void) } #ifdef CONFIG_X86 - if (!acpi_ioapic) { + if (!acpi_ioapic && !acpi_gbl_reduced_hardware) { /* compatible (0) means level (3) */ if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index db78d353bab1..4d84118a000b 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -553,7 +553,7 @@ acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, * ACPI interrupts different from the SCI in our copy of the FADT are * not supported. */ - if (gsi != acpi_gbl_FADT.sci_interrupt) + if (gsi != acpi_gbl_FADT.sci_interrupt || acpi_gbl_reduced_hardware) return AE_BAD_PARAMETER; if (acpi_irq_handler) -- 2.11.0
