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Commit 455c0d71 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Len Brown
Browse files

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: default avatarDarrick J. Wong <djwong@us.ibm.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f8b55f25

drivers/acpi/processor_perflib.c

+5 −1
Original line number Diff line number Diff line
@@ -413,7 +413,11 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr) 
	if (result)

		goto update_bios;



	return 0;

	/* We need to call _PPC once when cpufreq starts */

	if (ignore_ppc != 1)

		result = acpi_processor_get_platform_limit(pr);



	return result;



	/*

	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that