[CPUFREQ] p4-clockmod reports wrong frequency.

http://bugzilla.kernel.org/show_bug.cgi?id=10968

[ Updated for current tree, and fixed compile failure
  when p4-clockmod was built modular -- davej]

From: Matthias-Christian Ott <ott@mirix.org>
Signed-off-by: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c b/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
index 46a2a7a53148..1778402305e0 100644
--- a/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
+++ b/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
@@ -31,6 +31,7 @@
 
 #include <asm/processor.h>
 #include <asm/msr.h>
+#include <asm/timer.h>
 
 #include "speedstep-lib.h"
 
@@ -224,6 +225,12 @@ static int cpufreq_p4_cpu_init(struct cpufreq_policy *policy)
                 dprintk("has errata -- disabling low frequencies\n");
         }
 
+        if (speedstep_detect_processor() == SPEEDSTEP_CPU_P4D &&
+            c->x86_model < 2) {
+                /* switch to maximum frequency and measure result */
+                cpufreq_p4_setdc(policy->cpu, DC_DISABLE);
+                recalibrate_cpu_khz();
+        }
         /* get max frequency */
         stock_freq = cpufreq_p4_get_frequency(c);
         if (!stock_freq)