Change in coreboot[master]: mb/google/dedede/var/lantis: Configure Acoustic noise mitigation UPDs

[Karthik Ramasubramanian (Code Review)]

Karthik Ramasubramanian has submitted this change. ( https://review.coreboot.org/c/coreboot/+/51762 )

Change subject: mb/google/dedede/var/lantis: Configure Acoustic noise mitigation UPDs
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mb/google/dedede/var/lantis: Configure Acoustic noise mitigation UPDs

Enable Acoustic noise mitigation for lantis and set slew rate to 1/4
which is calibrated value for the board. Other values like PreWake,
Rampup and RampDown are 0 by default.

BUG=b:183561593
BRANCH=dedede
TEST=EE verify acoustic noise test passes.

Change-Id: I5e5f24ed934910726c220678068d085b6ee2bcf6
Signed-off-by: Tony Huang 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51762
Reviewed-by: Karthik Ramasubramanian 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/google/dedede/variants/lantis/overridetree.cb
1 file changed, 6 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Karthik Ramasubramanian: Looks good to me, approved

diff --git a/src/mainboard/google/dedede/variants/lantis/overridetree.cb b/src/mainboard/google/dedede/variants/lantis/overridetree.cb
index 368b1dd..b9d6f72 100644
--- a/src/mainboard/google/dedede/variants/lantis/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/lantis/overridetree.cb
@@ -65,6 +65,12 @@
    	.tdp_pl2_override = 15,
    }"

+	# Enable Acoustic noise mitigation and set slew rate to 1/4
+	# Rest of the parameters are 0 by default.
+	register "AcousticNoiseMitigation" = "1"
+	register "SlowSlewRate" = "SlewRateFastBy4"
+	register "FastPkgCRampDisable" = "1"
+
    device domain 0 on
    	device pci 04.0 on
    		chip drivers/intel/dptf