Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9506
-gerrit
commit d8a4612e015c2f4961401dcd8d85c3cf55665e5b Author: Shawn Nematbakhsh shawnn@chromium.org Date: Wed Feb 11 14:33:51 2015 -0800
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 reinauer@chromium.org Original-Commit-Id: 041fca21b863d3fd94dd5bebf89fe48f5ac74285 Original-Change-Id: Id7e55f3710304369a79150129db18300ae38f93a Original-Signed-off-by: Shawn Nematbakhsh shawnn@chromium.org Original-Reviewed-on: https://chromium-review.googlesource.com/248791 Original-Reviewed-by: Duncan Laurie dlaurie@chromium.org --- 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 3eaea40..d12762d 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