[coreboot-gerrit] [XS] Change in coreboot[main]: mb/google/nissa/var/rull: Configure Acoustic noise mitigation

[Rui Zhou (Code Review)]

Rui Zhou has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/85798?usp=email )

Change subject: mb/google/nissa/var/rull: Configure Acoustic noise mitigation
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mb/google/nissa/var/rull: Configure Acoustic noise mitigation

Follow the power team’s recommendation:
- Enable Acoustic noise mitigation
- Set slow slew rate VCCIA and VCCGT to SLEW_FAST_8
- Set FastPkgCRampDisable VCCIA and VCCGT to 1

BUG=b:380384127
TEST=built firmware and verified by power team, and noise pass

Change-Id: Ib7f60f1248c6b46f4f9bac1731be4f0396766ae2
Signed-off-by: Rui Zhou 
---
M src/mainboard/google/brya/variants/rull/overridetree.cb
1 file changed, 7 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/98/85798/1

diff --git a/src/mainboard/google/brya/variants/rull/overridetree.cb b/src/mainboard/google/brya/variants/rull/overridetree.cb
index d4b773a..d6262de 100644
--- a/src/mainboard/google/brya/variants/rull/overridetree.cb
+++ b/src/mainboard/google/brya/variants/rull/overridetree.cb
@@ -12,6 +12,13 @@
 end

chip soc/intel/alderlake
+	# Acoustic settings
+	register "acoustic_noise_mitigation" = "1"
+	register "slow_slew_rate[VR_DOMAIN_IA]" = "SLEW_FAST_8"
+	register "slow_slew_rate[VR_DOMAIN_GT]" = "SLEW_FAST_8"
+	register "fast_pkg_c_ramp_disable[VR_DOMAIN_IA]" = "1"
+	register "fast_pkg_c_ramp_disable[VR_DOMAIN_GT]" = "1"
+
    register "sagv" = "SaGv_Enabled"

# EMMC Tx CMD Delay