From 7e06a9044a3da814ce3a3e99532d064170fd5521 Mon Sep 17 00:00:00 2001 From: Maulik V Vaghela Date: Wed, 6 Jan 2021 11:13:07 +0530 Subject: mb/google/dedede: Enable "FastPkgCRampDisable" upd for noise mitigation As part of acoustic noise mitigation calibration, we need to enable FastPkgCRampDisable upd along with slew rate = 1. This values has been derived based on noise calibration done. Please refer document 575216 for procedure. BUG=None BRANCH=dedede TEST=correct value has been programmed and slew rate measurement is correct on scope. Change-Id: Ie42c8ab647ff42fa043b6f717a9834f9b9c551f6 Signed-off-by: Maulik V Vaghela Reviewed-on: https://review.coreboot.org/c/coreboot/+/49134 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh Reviewed-by: Karthik Ramasubramanian Reviewed-by: Evan Green --- src/mainboard/google/dedede/variants/drawcia/overridetree.cb | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/mainboard/google/dedede/variants/drawcia/overridetree.cb b/src/mainboard/google/dedede/variants/drawcia/overridetree.cb index e09dbe8bf7..59593432fe 100644 --- a/src/mainboard/google/dedede/variants/drawcia/overridetree.cb +++ b/src/mainboard/google/dedede/variants/drawcia/overridetree.cb @@ -67,7 +67,8 @@ chip soc/intel/jasperlake # Enable Acoustic noise mitigation and set slew rate to 1/4 # Rest of the parameters are 0 by default. register "AcousticNoiseMitigation" = "1" - register "SlowSlewRate" = "1" + register "SlowSlewRate" = "SlewRateFastBy4" + register "FastPkgCRampDisable" = "1" device domain 0 on device pci 05.0 on # IPU - MIPI Camera -- cgit v1.2.3