x86: Disable HPET MSI on ATI SB700/SB800
authorPallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
Thu, 21 Jan 2010 19:09:52 +0000 (11:09 -0800)
committerIngo Molnar <mingo@elte.hu>
Sat, 23 Jan 2010 05:21:58 +0000 (06:21 +0100)
commit73472a46b5b28116b145fb5fc05242c1aa8e1461
treebbcb6174edb2ea3c94e64bbfe7f92f3f128d96d3
parent3a5fc0e40cb467e692737bc798bc99773c81e1e2
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>
arch/x86/include/asm/hpet.h
arch/x86/kernel/hpet.c
arch/x86/kernel/quirks.c