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[ACPI] properly detect pmtimer on ASUS a8v motherboard 

Handle FADT 2.0 xpmtmr address 0 case.

http://bugzilla.kernel.org/show_bug.cgi?id=5283

Signed-off-by: Shaohua Li<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
David Shaohua Li 2005-09-21 01:35:00 -04:00 committed by Len Brown
parent d2149b5423
commit e6e87b4bfe
1 changed files with 7 additions and 0 deletions
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7
arch/i386/kernel/acpi/boot.c
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@ -638,6 +638,13 @@ static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
return 0;
pmtmr_ioport = fadt->xpm_tmr_blk.address;
/*
* "X" fields are optional extensions to the original V1.0
* fields, so we must selectively expand V1.0 fields if the
* corresponding X field is zero.
*/
if (!pmtmr_ioport)
pmtmr_ioport = fadt->V1_pm_tmr_blk;
} else {
/* FADT rev. 1 */
pmtmr_ioport = fadt->V1_pm_tmr_blk;