Angel Pons has uploaded this change for review.
cpu/intel/model_206ax: Add overclocking support
Add a Kconfig option to force Turbo Ratio values to the maximum possible
value, which is the maximum non-turbo ratio plus the number of OC bins.
Tested on Asus P8Z77-V LX2 with an i5-3330, CPU now runs at 3.4 GHz.
Change-Id: I60bef32bfdde3c32a11f07afff64fc83d65fd3f1
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
M src/cpu/intel/model_206ax/Kconfig
M src/cpu/intel/model_206ax/model_206ax.h
M src/cpu/intel/model_206ax/model_206ax_init.c
3 files changed, 55 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/47/42547/1
diff --git a/src/cpu/intel/model_206ax/Kconfig b/src/cpu/intel/model_206ax/Kconfig
index c6a5020..df78524 100644
--- a/src/cpu/intel/model_206ax/Kconfig
+++ b/src/cpu/intel/model_206ax/Kconfig
@@ -38,4 +38,13 @@
int
default 8
+config FORCE_MAX_TURBO_RATIO
+ bool "Force turbo ratios to the maximum possible value"
+ default n
+ help
+ By selecting this, all core turbo ratios will be set to the maximum possible value,
+ which is the maximum non-turbo ratio of the CPU plus the number of overclocking bins
+ by which the CPU can be overclocked. This is an overclocking option and therefore is
+ dangerous to enable, especially on mobile platforms with a limited cooling solution!
+
endif
diff --git a/src/cpu/intel/model_206ax/model_206ax.h b/src/cpu/intel/model_206ax/model_206ax.h
index e24993c..7ac3ec9 100644
--- a/src/cpu/intel/model_206ax/model_206ax.h
+++ b/src/cpu/intel/model_206ax/model_206ax.h
@@ -18,6 +18,7 @@
#define MSR_PIC_MSG_CONTROL 0x2e
#define MSR_PLATFORM_INFO 0xce
#define PLATFORM_INFO_SET_TDP (1 << 29)
+#define PLATFORM_INFO_RATIO_LIMIT (1 << 28)
#define MSR_MISC_PWR_MGMT 0x1aa
#define MISC_PWR_MGMT_EIST_HW_DIS (1 << 0)
diff --git a/src/cpu/intel/model_206ax/model_206ax_init.c b/src/cpu/intel/model_206ax/model_206ax_init.c
index e69d4fa..de4392d 100644
--- a/src/cpu/intel/model_206ax/model_206ax_init.c
+++ b/src/cpu/intel/model_206ax/model_206ax_init.c
@@ -14,6 +14,7 @@
#include <cpu/intel/turbo.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/name.h>
+#include <stdint.h>
#include "model_206ax.h"
#include "chip.h"
#include <cpu/intel/smm_reloc.h>
@@ -439,6 +440,47 @@
printk(BIOS_INFO, "CPU: VT %ssupported\n", mode[vt]);
}
+static void xe_init(void)
+{
+ msr_t msr;
+
+ /* If not enabled, do not touch anything */
+ if (!CONFIG(FORCE_MAX_TURBO_RATIO)) {
+ printk(BIOS_DEBUG, "XE: not overriding Turbo Ratio limits\n");
+ return;
+ }
+
+ /* Get the number of OC bins */
+ msr = rdmsr(MSR_FLEX_RATIO);
+ const uint8_t oc_bins = (msr.lo >> 17) & 0x7;
+
+ /* Ensure that the preconditions for XE are true */
+ msr = rdmsr(MSR_PLATFORM_INFO);
+ if (!(cpuid_eax(1) >= 0x206a3 && (msr.lo & PLATFORM_INFO_RATIO_LIMIT) && oc_bins)) {
+
+ printk(BIOS_WARNING, "XE: Cannot configure XE on a non-XE processor\n");
+ return;
+ }
+
+ /* Obtain maximum non-turbo ratio from MSR_PLATFORM_INFO */
+ const uint8_t max_non_turbo = (msr.lo >> 8) & 0xff;
+
+ /* Now do the deed */
+ msr = rdmsr(MSR_TURBO_RATIO_LIMIT);
+
+ msr.lo = 0;
+ msr.lo |= (max_non_turbo + oc_bins) << 0;
+ msr.lo |= (max_non_turbo + oc_bins) << 8;
+ msr.lo |= (max_non_turbo + oc_bins) << 16;
+ msr.lo |= (max_non_turbo + oc_bins) << 24;
+
+ printk(BIOS_NOTICE, "XE: Setting Turbo Ratio to %d... ", max_non_turbo + oc_bins);
+
+ wrmsr(MSR_TURBO_RATIO_LIMIT, msr);
+
+ printk(BIOS_NOTICE, "done.\n");
+}
+
static void model_206ax_init(struct device *cpu)
{
@@ -481,6 +523,9 @@
/* Enable Turbo */
enable_turbo();
+
+ /* Crank up the turbo ratio, if possible and desired */
+ xe_init();
}
/* MP initialization support. */
To view, visit change 42547. To unsubscribe, or for help writing mail filters, visit settings.