Commit 9340e1cc authored by Matthew Garrett's avatar Matthew Garrett Committed by Ingo Molnar
Browse files

x86, ioapic, acpi quirk: disable IRQ 0 through I/O APIC for some HP systems 



Some HP laptops have a problem with their DSDT reporting as
HP/SB400/10000, which includes some code which overrides all temperature
trip points to 16C if the INTIN2 input of the I/O APIC is enabled.  This
input is incorrectly designated the ISA IRQ 0 via an interrupt source
override even though it is wired to the output of the master 8259A and
INTIN0 is not connected at all.  So far two models have been identified,
namely nx6125 and nx6325.

Use a knob provided by the I/O APIC interrupt registration code to
abandon any attempts to route IRQ 0 through the I/O APIC for these
systems.

Signed-off-by: default avatarMaciej W. Rozycki <macro@linux-mips.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 471694ea

arch/x86/kernel/acpi/boot.c

+37 −0
Original line number Diff line number Diff line
@@ -1426,6 +1426,17 @@ static int __init force_acpi_ht(const struct dmi_system_id *d) 
	return 0;

}



/*

 * Don't register any I/O APIC entries for the 8254 timer IRQ.

 */

static int __init

dmi_disable_irq0_through_ioapic(const struct dmi_system_id *d)

{

	pr_notice("%s detected: disabling IRQ 0 through I/O APIC\n", d->ident);

	disable_irq0_through_ioapic = 1;

	return 0;

}



/*

 * If your system is blacklisted here, but you find that acpi=force

 * works for you, please contact acpi-devel@sourceforge.net
@@ -1593,6 +1604,32 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = { 
		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),

		     },

	 },

	/*

	 * HP laptops which use a DSDT reporting as HP/SB400/10000,

	 * which includes some code which overrides all temperature

	 * trip points to 16C if the INTIN2 input of the I/O APIC

	 * is enabled.  This input is incorrectly designated the

	 * ISA IRQ 0 via an interrupt source override even though

	 * it is wired to the output of the master 8259A and INTIN0

	 * is not connected at all.  Abandon any attempts to route

	 * IRQ 0 through the I/O APIC therefore.

	 */

	{

	 .callback = dmi_disable_irq0_through_ioapic,

	 .ident = "HP NX6125 laptop",

	 .matches = {

		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),

		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),

		     },

	 },

	{

	 .callback = dmi_disable_irq0_through_ioapic,

	 .ident = "HP NX6325 laptop",

	 .matches = {

		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),

		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),

		     },

	 },

	{}

};

CRA Git | Maintained and supported by SUSTech CRA and CCSE