From 51de1802f34c73710df9115557c5c13524e8608c Mon Sep 17 00:00:00 2001 From: Chris Wang Date: Fri, 24 Nov 2017 13:43:50 +0800 Subject: mb/google/poppy/variants/nautilus: Change IA/GT/SA slow slew rate settings Change IA/GT/SA slow slew rate settings. System's audible noise will be reduced with them. - Slow slew rate for IA/GT/SA : fast/16 - Fast PKG C-state ramp for IA/GT/SA: disabled BRANCH=master BUG=none TEST=compiled/verified Change-Id: Ibf11aba7bafb3b02c510905d7d904507eee6394b Signed-off-by: Chris Wang Reviewed-on: https://review.coreboot.org/22588 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh Reviewed-by: shkim --- src/mainboard/google/poppy/variants/nautilus/devicetree.cb | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb index efaea3fc57..6ee7a52f80 100644 --- a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb +++ b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb @@ -70,6 +70,14 @@ chip soc/intel/skylake register "pirqg_routing" = "PCH_IRQ11" register "pirqh_routing" = "PCH_IRQ11" + # VR Slew rate setting for improving audible noise + register "AcousticNoiseMitigation" = "1" + register "FastPkgCRampDisableIa" = "1" + register "FastPkgCRampDisableGt" = "1" + register "FastPkgCRampDisableSa" = "1" + register "SlowSlewRateForIa" = "3" # Fast/16 + register "SlowSlewRateForGt" = "3" # Fast/16 + register "SlowSlewRateForSa" = "3" # Fast/16 # VR Settings Configuration for 4 Domains #+----------------+-------+-------+-------+-------+ #| Domain/Setting | SA | IA | GTUS | GTS | -- cgit v1.2.3