[PATCH] x86/platform, acpi: Statically assign IRQ numbers in ACPI hardware reduced mode

[Aubrey Li]

We should be able to dynamically assign IRQ number on the platform in ACPI
Hardware-reduced mode, but 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:

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

Signed-off-by: Li Aubrey <aubrey.li@xxxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
 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


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