Commit dff244af authored Jan 30, 2008 by Alistair John Strachan Committed by Ingo Molnar Jan 30, 2008

x86: force enable HPET on (some?) ICH9 boards



Some consumer ICH9 boards (such as the Abit IP35 Pro) do not provide a BIOS
option for enabling the HPET. The same ICH workaround used for 6,7,8 can be
applied to 9. Here I enable the only PCI id that was visible on my system.

I have confirmed the HPETs work both from userspace and as a clocksource for
the running kernel (2.6.24 here) after applying this patch.

 Force enabled HPET at base address 0xfed00000
 hpet clockevent registered
 hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0
 hpet0: 4 64-bit timers, 14318180 Hz

Signed-off-by: Alistair John Strachan <alistair@devzero.co.uk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 23916d49

arch/x86/kernel/quirks.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -162,6 +162,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
		ich_force_enable_hpet);
		DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
		ich_force_enable_hpet);
		DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
		ich_force_enable_hpet);


		static struct pci_dev *cached_dev;