the following patch was just integrated into master: commit 0dd72e8b1db78558ef148a5d67a2d12e73c36b94 Author: Rizwan Qureshi rizwan.qureshi@intel.com Date: Thu Oct 15 21:38:21 2015 +0530
skylake: Set Pkg Power clamping bit in Power Limit MSR
Setting the Package Power clamping bits in Power Limit MSR (MSR_PKG_POWER_LIMIT 0x610) Allows going below the OS requested P or T state for the time window specified for PL1 or PL2.
BRANCH=none BUG=chrome-os-partner:47041 TEST=Built and boot on kunimitsu, load the system with Aquarium WebGL, change the power limit value from default (TDP or 15W) to any lower value note that the Pkg power comes down and also the CPU frequency is lowered.
Change-Id: I9c0dd90a6660214ae142418aae8b8c5f6a739896 Signed-off-by: Patrick Georgi pgeorgi@chromium.org Original-Commit-Id: b0b527991c2d26da5772700a22ff101eaf9993ef Original-Change-Id: Ia59fcfe2a14cd7f8b1e1b8e967073e67eb452f42 Original-Signed-off-by: Rizwan Qureshi rizwan.qureshi@intel.com Original-Reviewed-on: https://chromium-review.googlesource.com/309556 Original-Tested-by: Charulatha Varadarajan charuprasanna@gmail.com Original-Tested-by: Charulatha Varadarajan charulatha.varadarajan@intel.com Original-Reviewed-by: Duncan Laurie dlaurie@chromium.org Reviewed-on: http://review.coreboot.org/12257 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer stefan.reinauer@coreboot.org
See http://review.coreboot.org/12257 for details.
-gerrit