erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

mb/google/fatcat: Configure Acoustic noise mitigation

Browse source 
As per Intel doc 861712, enable acoustic noise mitigation for fatcat,
disable fast PKG C state ramp and set slew rate to Fast/2 for VR
domain.
Reference: Intel doc 861712

TEST=Able to build and boot google/fatcat.

Before:

AcousticNoiseMitigation : 0x0
FastPkgCRampDisable for Index = 1 : 0x2
SlowSlewRate for Index = 1 : 0x0

After:

AcousticNoiseMitigation : 0x1
FastPkgCRampDisable for Index = 1 : 0x1
SlowSlewRate for Index = 1 : 0x0

Change-Id: I63c51354cb70c87f9c9c239cb56d5c64f0eabe32
Signed-off-by: Bora Guvendik <bora.guvendik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89124
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
Bora Guvendik 2025-09-09 10:52:03 -07:00 • committed by Matt DeVillier
commit 2a7a0e86cd
1 changed files with 6 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/mainboard/google/fatcat/variants/baseboard/fatcat/devicetree.cb
View file

@ -30,6 +30,12 @@ chip soc/intel/pantherlake
register "tcss_ports[2]" = "TCSS_PORT_EMPTY" # Disable USB-C Port 2
register "tcss_ports[3]" = "TCSS_PORT_EMPTY" # Disable USB-C Port 3
# Acoustic Noise settings and slew rate configuration:
# Slew rate for GT Domain: Fast/2
register "enable_acoustic_noise_mitigation" = "true"
register "disable_fast_pkgc_ramp[VR_DOMAIN_GT]" = "true"
register "slow_slew_rate_config[VR_DOMAIN_GT]" = "SLEW_FAST_2"
# Enable SAGv
register "sagv" = "SAGV_ENABLED"