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cpu/intel/haswell: Add fast ramp voltage for Broadwell

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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>
This commit is contained in:
Angel Pons
2020-10-28 23:53:45 +01:00
parent 8b043c058c
commit c86b119495
2 changed files with 11 additions and 2 deletions
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7
src/cpu/intel/haswell/haswell_init.c
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@ -294,8 +294,11 @@ static void initialize_vr_config(void)
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);
}