From: Andy Shevchenko Date: Fri, 15 Dec 2017 21:25:11 +0000 (+0200) Subject: ACPI / x86: boot: Don't setup SCI on HW-reduced platforms X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=7c7bcfeae2d8e59066bd273b7d70392574e14c15;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Rafael J. Wysocki --- 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);