From: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx> ACPI 5.2.9.3 IA-PC Boot Architecture flag ACPI_FADT_LEGACY_DEVICES can be used to determine if a system has legacy devices LPC or ISA devices. The x86 platform already has a struct which lists known associated legacy devices, we start off careful only by disabling root devices we should not regress with. The struct and device list can be expanded with time to cover more root legacy components. Change-Id: I85ba7dfb405c7faefc0f8e6b43a6e7260a27a1c9 Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: andrew.cooper3@xxxxxxxxxx Cc: andriy.shevchenko@xxxxxxxxxxxxxxx Cc: bigeasy@xxxxxxxxxxxxx Cc: boris.ostrovsky@xxxxxxxxxx Cc: david.vrabel@xxxxxxxxxx Cc: ffainelli@xxxxxxxxxx Cc: george.dunlap@xxxxxxxxxx Cc: glin@xxxxxxxx Cc: jgross@xxxxxxxx Cc: jlee@xxxxxxxx Cc: josh@xxxxxxxxxxxxxxxx Cc: julien.grall@xxxxxxxxxx Cc: konrad.wilk@xxxxxxxxxx Cc: kozerkov@xxxxxxxxxxxxx Cc: lenb@xxxxxxxxxx Cc: lguest@xxxxxxxxxxxxxxxx Cc: linux-acpi@xxxxxxxxxxxxxxx Cc: lv.zheng@xxxxxxxxx Cc: matt@xxxxxxxxxxxxxxxxxxx Cc: mbizon@xxxxxxxxxx Cc: rjw@xxxxxxxxxxxxx Cc: robert.moore@xxxxxxxxx Cc: rusty@xxxxxxxxxxxxxxx Cc: tiwai@xxxxxxx Cc: toshi.kani@xxxxxx Cc: xen-devel@xxxxxxxxxxxxxxxxxxx Link: http://lkml.kernel.org/r/1460592286-300-13-git-send-email-mcgrof@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/kernel/acpi/boot.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 8816102..7a25121 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -936,6 +936,10 @@ late_initcall(hpet_insert_resource); static int __init acpi_parse_fadt(struct acpi_table_header *table) { + if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) { + pr_debug("ACPI: no legacy devices present\n"); + x86_platform.legacy.devices.pnpbios = 0; + } if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) && -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
