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-rw-r--r--src/cpu/intel/haswell/haswell_init.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/cpu/intel/haswell/haswell_init.c b/src/cpu/intel/haswell/haswell_init.c
index c67ef1438d..2340dd0b03 100644
--- a/src/cpu/intel/haswell/haswell_init.c
+++ b/src/cpu/intel/haswell/haswell_init.c
@@ -333,9 +333,11 @@ static void initialize_vr_config(void)
msr.hi &= ~(1 << (51 - 32));
/* Enable decay mode on C-state entry. */
msr.hi |= (1 << (52 - 32));
- /* Set the slow ramp rate to be fast ramp rate / 4 */
- msr.hi &= ~(0x3 << (53 - 32));
- msr.hi |= (0x01 << (53 - 32));
+ if (haswell_is_ult()) {
+ /* Set the slow ramp rate to be fast ramp rate / 4 */
+ msr.hi &= ~(0x3 << (53 - 32));
+ msr.hi |= (0x01 << (53 - 32));
+ }
/* Set MIN_VID (31:24) to allow CPU to have full control. */
msr.lo &= ~0xff000000;
wrmsr(MSR_VR_MISC_CONFIG, msr);