Crank up CPU speed on Intel Core and Core2 CPUs

The CPUs start on their slowest speed, and were left that way by
coreboot. This change will speed up coreboot a bit, as well as
systems that don't change the clock for whatever reason.

Change-Id: Ia6225eea97299a473cf50eccc6c5e7de830b1ddc
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/176
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/cpu/intel/model_6fx/model_6fx_init.c b/src/cpu/intel/model_6fx/model_6fx_init.c
index a3939c91f7..5cb1caed89 100644
--- a/src/cpu/intel/model_6fx/model_6fx_init.c
+++ b/src/cpu/intel/model_6fx/model_6fx_init.c
@@ -29,6 +29,7 @@
 #include <cpu/x86/lapic.h>
 #include <cpu/intel/microcode.h>
 #include <cpu/intel/speedstep.h>
+#include <cpu/intel/acpi.h>
 #include <cpu/intel/hyperthreading.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/name.h>
@@ -156,6 +157,19 @@ static void configure_misc(void)
 
 	msr.lo |= (1 << 20);	/* Lock Enhanced SpeedStep Enable */
 	wrmsr(IA32_MISC_ENABLE, msr);
+
+	// set maximum CPU speed
+	msr = rdmsr(IA32_PERF_STS);
+	int busratio_max=(msr.hi >> (40-32)) & 0x1f;
+
+	msr = rdmsr(IA32_PLATFORM_ID);
+	int vid_max=msr.lo & 0x3f;
+
+	msr.lo &= ~0xffff;
+	msr.lo |= busratio_max << 8;
+	msr.lo |= vid_max;
+
+	wrmsr(IA32_PERF_CTL, msr);
 }
 
 #define PIC_SENS_CFG	0x1aa