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ACPI: Fix regression where _PPC is not read at boot even when ignore_ppc=0
Earlier, Ingo Molnar posted a patch to make it so that the kernel would avoid reading _PPC on his broken T60. Unfortunately, it seems that with Thomas Renninger's patch last July to eliminate _PPC evaluations when the processor driver loads, the kernel never actually reads _PPC at all! This is problematic if you happen to boot your non-T60 computer in a state where the BIOS _wants_ _PPC to be something other than zero. So, put the _PPC evaluation back into acpi_processor_get_performance_info if ignore_ppc isn't 1. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -413,7 +413,11 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
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if (result)
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goto update_bios;
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return 0;
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/* We need to call _PPC once when cpufreq starts */
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if (ignore_ppc != 1)
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result = acpi_processor_get_platform_limit(pr);
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return result;
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/*
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* Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
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