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

[Stanley Wu (Code Review)]

Stanley Wu has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/52135 )

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

Enable Acoustic noise mitigation for boten and set slew rate to 1/8
which is calibrated value for the board.

BUG=b:180668001
BRANCH=dedede
TEST=build firmware to UPD and Acoustic noise test

Change-Id: I75851bd7c279feeab4ab94f4c82d55bf0e5ce316
Signed-off-by: Stanley Wu 
---
M src/mainboard/google/dedede/variants/boten/overridetree.cb
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/35/52135/1

diff --git a/src/mainboard/google/dedede/variants/boten/overridetree.cb b/src/mainboard/google/dedede/variants/boten/overridetree.cb
index 34044ff..f914b82 100644
--- a/src/mainboard/google/dedede/variants/boten/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/boten/overridetree.cb
@@ -74,6 +74,12 @@
    	[PchSerialIoIndexI2C5]  = PchSerialIoPci,
    }"

+	# Enable Acoustic noise mitigation and set slew rate to 1/8
+	# Rest of the parameters are 0 by default.
+	register "AcousticNoiseMitigation" = "1"
+	register "SlowSlewRate" = "SlewRateFastBy8"
+	register "FastPkgCRampDisable" = "1"
+
    device domain 0 on
    	device pci 04.0 on
    		chip drivers/intel/dptf