diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cpu/intel/haswell/haswell_init.c | 8 |
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); |