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authorPallipadi, Venkatesh <venkatesh.pallipadi@intel.com>2010-01-21 11:09:52 -0800
committerIngo Molnar <mingo@elte.hu>2010-01-23 06:21:58 +0100
commit73472a46b5b28116b145fb5fc05242c1aa8e1461 (patch)
treebbcb6174edb2ea3c94e64bbfe7f92f3f128d96d3 /arch/x86/include
parent3a5fc0e40cb467e692737bc798bc99773c81e1e2 (diff)
x86: Disable HPET MSI on ATI SB700/SB800
HPET MSI on platforms with ATI SB700/SB800 as they seem to have some side-effects on floppy DMA. Do not use HPET MSI on such platforms. Original problem report from Mark Hounschell http://lkml.indiana.edu/hypermail/linux/kernel/0912.2/01118.html [ This patch needs to go to stable as well. But, there are some conflicts that prevents the patch from going as is. I can rebase/resubmit to stable once the patch goes upstream. hpa: still Cc:'ing stable@ as an FYI. ] Tested-by: Mark Hounschell <markh@compro.net> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: <stable@kernel.org> LKML-Reference: <20100121190952.GA32523@linux-os.sc.intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/hpet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/hpet.h b/arch/x86/include/asm/hpet.h
index 5d89fd2a369..1d5c08a1bdf 100644
--- a/arch/x86/include/asm/hpet.h
+++ b/arch/x86/include/asm/hpet.h
@@ -67,6 +67,7 @@ extern unsigned long hpet_address;
extern unsigned long force_hpet_address;
extern u8 hpet_blockid;
extern int hpet_force_user;
+extern u8 hpet_msi_disable;
extern int is_hpet_enabled(void);
extern int hpet_enable(void);
extern void hpet_disable(void);