linux-kernel - [PATCH] Force enable HPET on (some?) ICH9 boards

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Date:	Sun, 27 Jan 2008 14:32:59 +0000
From:	Alistair John Strachan <alistair@...zero.co.uk>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alistair John Strachan <alistair@...zero.co.uk>
Subject: [PATCH] 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@...zero.co.uk>

---
 arch/x86/kernel/quirks.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index fab30e1..150ba29 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -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;

-- 
Cheers,
Alistair.

137/1 Warrender Park Road, Edinburgh, UK.
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