cpu/intel/haswell: Add fast ramp voltage for Broadwell
Backport commit 55228ba4b4 (broadwell: Changes from 2.2.0 ref code) to
Haswell, to eventually migrate Broadwell to use the same Haswell code.
Change-Id: I03d9ff16bcaab9091bd723ce933aa3f2d71e29b9
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46921
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/intel/haswell/haswell_init.c b/src/cpu/intel/haswell/haswell_init.c
index 9881bb8..b1f8bba 100644
--- a/src/cpu/intel/haswell/haswell_init.c
+++ b/src/cpu/intel/haswell/haswell_init.c
@@ -294,8 +294,11 @@
msr = rdmsr(MSR_VR_MISC_CONFIG2);
msr.lo &= ~0xffff;
/* Allow CPU to control minimum voltage completely (15:8) and
- * set the fast ramp voltage to 1110mV (0x6f in 10mV steps). */
- msr.lo |= 0x006f;
+ set the fast ramp voltage in 10mV steps. */
+ if (cpu_family_model() == BROADWELL_FAMILY_ULT)
+ msr.lo |= 0x006a; /* 1.56V */
+ else
+ msr.lo |= 0x006f; /* 1.60V */
wrmsr(MSR_VR_MISC_CONFIG2, msr);
}