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| author | Harald Welte <HaraldWelte@viatech.com> | 2009-11-24 16:53:00 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-08 10:21:48 -0800 |
| commit | 37ed9bf8e31377284ca719b823e6794386ee0d5b (patch) | |
| tree | 0b8f50f98e0d5d3561e889a6fcaadadc3511672d /arch | |
| parent | 57ce46ef790bc67038322ed59c26f6d8eed9ee61 (diff) | |
| download | lwn-37ed9bf8e31377284ca719b823e6794386ee0d5b.tar.gz lwn-37ed9bf8e31377284ca719b823e6794386ee0d5b.zip | |
Enable ACPI PDC handshake for VIA/Centaur CPUs
commit d77b81974521c82fa6fda38dfff1b491dcc62a32 upstream.
In commit 0de51088e6a82bc8413d3ca9e28bbca2788b5b53, we introduced the
use of acpi-cpufreq on VIA/Centaur CPU's by removing a vendor check for
VENDOR_INTEL. However, as it turns out, at least the Nano CPU's also
need the PDC (processor driver capabilities) handshake in order to
activate the methods required for acpi-cpufreq.
Since arch_acpi_processor_init_pdc() contains another vendor check for
Intel, the PDC is not initialized on VIA CPU's. The resulting behavior
of a current mainline kernel on such systems is: acpi-cpufreq
loads and it indicates CPU frequency changes. However, the CPU stays at
a single frequency
This trivial patch ensures that init_intel_pdc() is called on Intel and
VIA/Centaur CPU's alike.
Signed-off-by: Harald Welte <HaraldWelte@viatech.com>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/acpi/processor.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/processor.c b/arch/x86/kernel/acpi/processor.c index d296f4a195c9..d85d1b2432ba 100644 --- a/arch/x86/kernel/acpi/processor.c +++ b/arch/x86/kernel/acpi/processor.c @@ -79,7 +79,8 @@ void arch_acpi_processor_init_pdc(struct acpi_processor *pr) struct cpuinfo_x86 *c = &cpu_data(pr->id); pr->pdc = NULL; - if (c->x86_vendor == X86_VENDOR_INTEL) + if (c->x86_vendor == X86_VENDOR_INTEL || + c->x86_vendor == X86_VENDOR_CENTAUR) init_intel_pdc(pr, c); return; |