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authorDarrick J. Wong <djwong@us.ibm.com>2010-02-18 10:28:20 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-13 13:20:17 -0700
commita234580f5c847eaa59e775469205734c5d94e846 (patch)
parent876c10addb8c8f064dae77b13f85d756df60bcf8 (diff)
ACPI: Fix regression where _PPC is not read at boot even when ignore_ppc=0
commit 455c0d71d46e86b0b7ff2c9dcfc19bc162302ee9 upstream. 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> Acked-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 8ba0ed0b9ddb..40d395efec1e 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -356,7 +356,11 @@ 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