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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2006-12-05 01:39:16 (GMT) |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2006-12-12 22:29:04 (GMT) |
| commit | e11952b971ee729a8fdc2bfb1252f5760c0287b0 (patch) | |
| tree | 38ef26ec277daebf98af6abf64b5c32b28a4d32c /arch/i386/kernel/cpu | |
| parent | 7531a0b56f6211a5407c8cda4968c3b7ca9496ab (diff) | |
| download | linux-e11952b971ee729a8fdc2bfb1252f5760c0287b0.tar.xz | |
[CPUFREQ] p4-clockmod: fix support for Core
Support for Core CPUs was broken in two ways in speedstep-lib: for x86_64,
we missed a MSR definition; for both x86_64 and i386, the FSB calculation
was wrong by four (it's a quad-pumped bus). Also increase the accuracy
of the calculation.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/i386/kernel/cpu')
| -rw-r--r-- | arch/i386/kernel/cpu/cpufreq/speedstep-lib.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c b/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c index a709f6d..d59277c 100644 --- a/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c +++ b/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c @@ -123,23 +123,22 @@ static unsigned int pentiumM_get_frequency(void) return (msr_tmp * 100 * 1000); } -#ifdef CONFIG_X86_32 static unsigned int pentium_core_get_frequency(void) { u32 fsb = 0; u32 msr_lo, msr_tmp; rdmsr(MSR_FSB_FREQ, msr_lo, msr_tmp); - /* see table B-2 of 24547212.pdf */ + /* see table B-2 of 25366920.pdf */ switch (msr_lo & 0x07) { case 5: - fsb = 400; + fsb = 100000; break; case 1: - fsb = 533; + fsb = 133333; break; case 3: - fsb = 667; + fsb = 166667; break; default: printk(KERN_ERR "PCORE - MSR_FSB_FREQ undefined value"); @@ -149,11 +148,11 @@ static unsigned int pentium_core_get_frequency(void) dprintk("PCORE - MSR_IA32_EBL_CR_POWERON: 0x%x 0x%x\n", msr_lo, msr_tmp); msr_tmp = (msr_lo >> 22) & 0x1f; - dprintk("bits 22-26 are 0x%x, speed is %u\n", msr_tmp, (msr_tmp * fsb * 1000)); + dprintk("bits 22-26 are 0x%x, speed is %u\n", msr_tmp, (msr_tmp * fsb)); - return (msr_tmp * fsb * 1000); + return (msr_tmp * fsb); } -#endif + static unsigned int pentium4_get_frequency(void) { @@ -205,10 +204,8 @@ static unsigned int pentium4_get_frequency(void) unsigned int speedstep_get_processor_frequency(unsigned int processor) { switch (processor) { -#ifdef CONFIG_X86_32 case SPEEDSTEP_PROCESSOR_PCORE: return pentium_core_get_frequency(); -#endif case SPEEDSTEP_PROCESSOR_PM: return pentiumM_get_frequency(); case SPEEDSTEP_PROCESSOR_P4D: |