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authorDarrick J. Wong <djwong@us.ibm.com>2010-02-18 21:28:20 +0300
committerLen Brown <len.brown@intel.com>2010-02-19 09:11:48 +0300
commit455c0d71d46e86b0b7ff2c9dcfc19bc162302ee9 (patch)
treef313e798445ff65517599b429aa8563d6f26fe71
parentf8b55f251012e104093e105483c45c5d85ad3040 (diff)
downloadlinux-455c0d71d46e86b0b7ff2c9dcfc19bc162302ee9.tar.xz
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>
-rw-r--r--drivers/acpi/processor_perflib.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 2cabadcc4d8c..a959f6a07508 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -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