diff options
| author | Harald Welte <HaraldWelte@viatech.com> | 2009-11-24 18:53:00 +0300 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2009-11-24 21:33:32 +0300 |
| commit | d77b81974521c82fa6fda38dfff1b491dcc62a32 (patch) | |
| tree | 7095c29ad0f300e4f8838e195088d1639bf67628 /arch | |
| parent | a8a8a669ea13d792296737505adc43ccacf3a648 (diff) | |
| download | linux-d77b81974521c82fa6fda38dfff1b491dcc62a32.tar.xz | |
[CPUFREQ] Enable ACPI PDC handshake for VIA/Centaur CPUs
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>
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; |