We have to be conservative to dynamically assign IRQ number on the platform in ACPI Hardware-reduced mode. On the Bay Trail-T(ASUS-T100) platform, there is a RTC device still using the legacy hardcoded IRQ8, which could cause the following error if RTC is configured:
7486341a98f: genirq: Flags mismatch irq 8. 00000080 (mmc0) vs. 00000000 (rtc0) So we want to statically assign IRQ numbers in ACPI hardware reduced mode to fix this error, this also matches with the original IRQ assignment policy. Signed-off-by: Li Aubrey <[email protected]> Cc: Alan Cox <[email protected]> Cc: Len Brown <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: Arjan van de Ven <[email protected]> --- arch/x86/kernel/acpi/boot.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 803b684..4cd0761 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -460,8 +460,12 @@ acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end) acpi_table_print_madt_entry(header); - /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */ - if (ioapic->global_irq_base < nr_legacy_irqs()) + /* + * Statically assign IRQ numbers for IOAPICs hosting legacy IRQs, + * Or for the platform in Hardware-reduced ACPI model + */ + if (ioapic->global_irq_base < nr_legacy_irqs() || + acpi_gbl_reduced_hardware) cfg.type = IOAPIC_DOMAIN_LEGACY; mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base, -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
