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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2017-12-15 23:25:11 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-12-28 12:36:46 +0100
commit7c7bcfeae2d8e59066bd273b7d70392574e14c15 (patch)
tree42e3a2b3aee99b4ddfd4d702be06b42d811d9062 /arch/x86/kernel/acpi/boot.c
parent4565c4f6056967ee8844fa550e3cbbe1c0e65a11 (diff)
ACPI / x86: boot: Don't setup SCI on HW-reduced platforms
As per note in 5.2.9 Fixed ACPI Description Table (FADT) chapter of ACPI specification, on HW-reduced platforma OSPM should 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 a HW-reduced platform. HW-reduced platforms will still be able to use SCI in case it provides an override record in MADT table. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/kernel/acpi/boot.c')
-rw-r--r--arch/x86/kernel/acpi/boot.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 5a12cadbf019..4bf004bab4b2 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1209,8 +1209,9 @@ 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);