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authorPallipadi, Venkatesh <venkatesh.pallipadi@intel.com>2010-01-21 22:09:52 +0300
committerIngo Molnar <mingo@elte.hu>2010-01-23 08:21:58 +0300
commit73472a46b5b28116b145fb5fc05242c1aa8e1461 (patch)
treebbcb6174edb2ea3c94e64bbfe7f92f3f128d96d3 /arch/x86/kernel/quirks.c
parent3a5fc0e40cb467e692737bc798bc99773c81e1e2 (diff)
downloadlinux-73472a46b5b28116b145fb5fc05242c1aa8e1461.tar.xz
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/kernel/quirks.c')
-rw-r--r--arch/x86/kernel/quirks.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index 18093d7498f0..12e9feaa2f7a 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -491,6 +491,19 @@ void force_hpet_resume(void)
break;
}
}
+
+/*
+ * HPET MSI on some boards (ATI SB700/SB800) has side effect on
+ * floppy DMA. Disable HPET MSI on such platforms.
+ */
+static void force_disable_hpet_msi(struct pci_dev *unused)
+{
+ hpet_msi_disable = 1;
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
+ force_disable_hpet_msi);
+
#endif
#if defined(CONFIG_PCI) && defined(CONFIG_NUMA)