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| author | Darrick J. Wong <djwong@us.ibm.com> | 2010-02-18 19:28:20 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2010-02-19 07:11:48 +0100 |
| commit | 455c0d71d46e86b0b7ff2c9dcfc19bc162302ee9 (patch) | |
| tree | f313e798445ff65517599b429aa8563d6f26fe71 /drivers/acpi/processor_perflib.c | |
| parent | Orphan DECnet (diff) | |
| download | linux-455c0d71d46e86b0b7ff2c9dcfc19bc162302ee9.tar.xz linux-455c0d71d46e86b0b7ff2c9dcfc19bc162302ee9.zip | |
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>
Diffstat (limited to 'drivers/acpi/processor_perflib.c')
| -rw-r--r-- | drivers/acpi/processor_perflib.c | 6 |
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 |