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mb/google/fatcat/var/ruby: Add settings for resolving EE noise

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Because of EE noise issue, so add acoustic mitigation items.

Acoustic Noise Mitigation → Enable
Slow Slew Rate for IAcore Domain → <Fast/4>
Slow Slew Rate for GT Domain → <Fast/2>
Slow Slew Rate for Ecore Domain →  <Fast/4>
IAcore Disable Fast Package C-state ramp → True
GT Disable Fast Package C-state ramp → True
Ecore Disable Fast Package C-state ramp → True
P-Core Hysteresis  →  <3>
E-Core Hysteresis  →  <3>

BUG=b:479695733
TEST=Build and boot to OS, check EE noise are resolved.

Change-Id: I5d96cb3e87e9e5a2260b278746b7fce72be4fb59
Signed-off-by: Luca Lai <luca.lai@lcfc.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91412
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Luca Lai 2026-02-24 16:08:13 +08:00 • committed by Matt DeVillier
commit c069dc3eb1
1 changed files with 14 additions and 0 deletions
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14
src/mainboard/google/fatcat/variants/ruby/overridetree.cb
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@ -73,6 +73,20 @@ chip soc/intel/pantherlake
[VR_DOMAIN_SA] = 38 * 4
}"
# Acoustic Noise settings and slew rate configuration:
register "enable_acoustic_noise_mitigation" = "true"
# Slew rate for IA Domain: Fast/4
register "slow_slew_rate_config[VR_DOMAIN_IA]" = "SLEW_FAST_4"
# Slew rate for GT Domain: Fast/2
register "slow_slew_rate_config[VR_DOMAIN_GT]" = "SLEW_FAST_2"
# Slew rate for ATOM Domain: Fast/4
register "slow_slew_rate_config[VR_DOMAIN_ATOM]" = "SLEW_FAST_4"
register "disable_fast_pkgc_ramp[VR_DOMAIN_IA]" = "true"
register "disable_fast_pkgc_ramp[VR_DOMAIN_GT]" = "true"
register "disable_fast_pkgc_ramp[VR_DOMAIN_ATOM]" = "true"
register "pcore_hysteresis_window_ms" = "3"
register "ecore_hysteresis_window_ms" = "3"
register "usb2_ports[0]" = "USB2_PORT_TYPE_C(OC_SKIP)" # USB2_C0
register "usb2_ports[1]" = "USB2_PORT_TYPE_C(OC_SKIP)" # USB2_C1
register "usb2_ports[2]" = "USB2_PORT_MID(OC_SKIP)" # USB HUB (USB2 Camera)