From 1c4743f86b928400e097830eba21a30ddb23f741 Mon Sep 17 00:00:00 2001 From: Shawn Nematbakhsh Date: Wed, 11 Feb 2015 14:33:51 -0800 Subject: [PATCH] samus: Enable vr_slow_ramp Enable slow ramp rate to reduce idle noise / crackle. BUG=None TEST=Performance/noise/power tested by others. BRANCH=Samus Change-Id: I3b0083bdb19f96fc018356bd744fdff3baaf8962 Signed-off-by: Stefan Reinauer Original-Commit-Id: 041fca21b863d3fd94dd5bebf89fe48f5ac74285 Original-Change-Id: Id7e55f3710304369a79150129db18300ae38f93a Original-Signed-off-by: Shawn Nematbakhsh Original-Reviewed-on: https://chromium-review.googlesource.com/248791 Original-Reviewed-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/9506 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi --- src/mainboard/google/samus/devicetree.cb | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/mainboard/google/samus/devicetree.cb b/src/mainboard/google/samus/devicetree.cb index 1d7d5a1033..b3596a4fa7 100644 --- a/src/mainboard/google/samus/devicetree.cb +++ b/src/mainboard/google/samus/devicetree.cb @@ -59,6 +59,9 @@ chip soc/intel/broadwell # Disable S0ix for now register "s0ix_enable" = "0" + register "vr_slow_ramp_rate_set" = "3" + register "vr_slow_ramp_rate_enable" = "1" + device cpu_cluster 0 on device lapic 0 on end end