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

[zanxi chen (Code Review)]

zanxi chen has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/55610 )

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

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

BUG=b:187760191
BRANCH=dedede
TEST=build firmware to UPD and Acoustic noise test

Change-Id: I187702c23712416eaaaaf1e210dcfc6b2c560041
Signed-off-by: Zanxi Chen 
---
M src/mainboard/google/dedede/variants/blipper/overridetree.cb
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/10/55610/1

diff --git a/src/mainboard/google/dedede/variants/blipper/overridetree.cb b/src/mainboard/google/dedede/variants/blipper/overridetree.cb
index df3f9dd..c7f7eb0 100644
--- a/src/mainboard/google/dedede/variants/blipper/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/blipper/overridetree.cb
@@ -39,6 +39,12 @@
    # USB Port Configuration
    register "usb2_ports[5]" = "USB2_PORT_MID(OC_SKIP)"	# UF Camera

+	# 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 14.0 on
    		chip drivers/usb/acpi