[coreboot-gerrit] Change in coreboot[master]: nocturne: disable p-states

[Nick Vaccaro (Code Review)]

Nick Vaccaro has uploaded this change for review. ( https://review.coreboot.org/27156


Change subject: nocturne: disable p-states
......................................................................

nocturne: disable p-states

Add "intel_pstate=no_hwp" to the kernel command line to instruct
kernel to disable p-states as a temporary workaround for an SoC
hang.

BUG=b:79666828
BRANCH=none
TEST="emerge-nocturne depthcharge coreboot chromeos-bootimage",
flash spi image onto nocturne, boot to kernel and verify device
stays alive and responsive for several minutes without locking up.

Change-Id: I71ed4c80c109b28ffa85d48338ce3a62396d272e
Signed-off-by: Nick Vaccaro <nvaccaro at google.com>
---
M src/mainboard/google/poppy/variants/nocturne/devicetree.cb
1 file changed, 2 insertions(+), 1 deletion(-)



  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/27156/1

diff --git a/src/mainboard/google/poppy/variants/nocturne/devicetree.cb b/src/mainboard/google/poppy/variants/nocturne/devicetree.cb
index f746c08..0b30caa 100644
--- a/src/mainboard/google/poppy/variants/nocturne/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nocturne/devicetree.cb
@@ -60,7 +60,8 @@
 	register "PmTimerDisabled" = "1"
 	register "VmxEnable" = "1"
 
-	register "speed_shift_enable" = "1"
+	# Disable P-States
+	register "speed_shift_enable" = "0"
 	register "dptf_enable" = "1"
 	register "tdp_pl2_override" = "15"
 	register "psys_pmax" = "45"

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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I71ed4c80c109b28ffa85d48338ce3a62396d272e
Gerrit-Change-Number: 27156
Gerrit-PatchSet: 1
Gerrit-Owner: Nick Vaccaro <nvaccaro at google.com>
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