[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/+/85863?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

Set slow slew rate VCCIA and VCCGT to SLEW_FAST_4

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

Change-Id: I54c8412410cca33ffb19a2b21d678b6263ead297
Signed-off-by: Rui Zhou 
---
M src/mainboard/google/brya/variants/rull/overridetree.cb
1 file changed, 2 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/63/85863/1

diff --git a/src/mainboard/google/brya/variants/rull/overridetree.cb b/src/mainboard/google/brya/variants/rull/overridetree.cb
index 9d91a45..c53367f 100644
--- a/src/mainboard/google/brya/variants/rull/overridetree.cb
+++ b/src/mainboard/google/brya/variants/rull/overridetree.cb
@@ -14,8 +14,8 @@
 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 "slow_slew_rate[VR_DOMAIN_IA]" = "SLEW_FAST_4"
+	register "slow_slew_rate[VR_DOMAIN_GT]" = "SLEW_FAST_4"
    register "fast_pkg_c_ramp_disable[VR_DOMAIN_IA]" = "true"
    register "fast_pkg_c_ramp_disable[VR_DOMAIN_GT]" = "true"