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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>
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@ -638,6 +638,13 @@ static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
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return 0;
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pmtmr_ioport = fadt->xpm_tmr_blk.address;
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/*
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* "X" fields are optional extensions to the original V1.0
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* fields, so we must selectively expand V1.0 fields if the
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* corresponding X field is zero.
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*/
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if (!pmtmr_ioport)
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pmtmr_ioport = fadt->V1_pm_tmr_blk;
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} else {
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/* FADT rev. 1 */
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pmtmr_ioport = fadt->V1_pm_tmr_blk;
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