From 8fed12fb31b9437934525a0389e5b4a45be56bd2 Mon Sep 17 00:00:00 2001 From: Matt DeVillier Date: Tue, 15 Jun 2021 10:50:17 -0500 Subject: [PATCH 2/4] mb/purism/librem_mini: Enable acoustic noise mitigation Enable FastPkgCRampDisable for all domains, set SlowSlewRate to fast/16 for all domains. Test: boot Librem Mini v2, observe high frequency acoustic noise reduced. Change-Id: I10bc2a3e6b631b8c0b430e204f376aa9a81ac683 Signed-off-by: Matt DeVillier --- .../librem_cnl/variants/librem_mini/devicetree.cb | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/mainboard/purism/librem_cnl/variants/librem_mini/devicetree.cb b/src/mainboard/purism/librem_cnl/variants/librem_mini/devicetree.cb index 69d1b423bd..836f4aceaf 100644 --- a/src/mainboard/purism/librem_cnl/variants/librem_mini/devicetree.cb +++ b/src/mainboard/purism/librem_cnl/variants/librem_mini/devicetree.cb @@ -22,6 +22,16 @@ chip soc/intel/cannonlake # Misc register "AcousticNoiseMitigation" = "1" + register "FastPkgCRampDisableIa" = "1" + register "FastPkgCRampDisableGt" = "1" + register "FastPkgCRampDisableSa" = "1" + register "FastPkgCRampDisableFivr" = "1" + + register "SlowSlewRateForIa" = "3" # fast/16 + register "SlowSlewRateForGt" = "3" # fast/16 + register "SlowSlewRateForSa" = "3" # fast/16 + register "SlowSlewRateForFivr" = "3" # fast/16 + # Power register "PchPmSlpS3MinAssert" = "3" # 50ms register "PchPmSlpS4MinAssert" = "1" # 1s -- 2.30.2