[coreboot-gerrit] Change in coreboot[master]: mb/google/hatch: Enable PchPmSlpS0Vm075VSupport for hatch

[Kane Chen (Code Review)]

Kane Chen has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/35596 )

Change subject: mb/google/hatch: Enable PchPmSlpS0Vm075VSupport for hatch
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mb/google/hatch: Enable PchPmSlpS0Vm075VSupport for hatch

On hatch and variant HW designs supports VCCPRIM_CORE Low Voltage Mode.
VCCPRIM_CORE can be down to 0.75v when slp_s0 is asserted.

This commit enables PchPmSlpS0Vm075VSupport UPD so that FSP can
program related setttings to save power.

BUG=b:134092071
TEST=Run suspend_stress_test on kohaku and pass 100 cycles

Change-Id: Ia02ff8823883489b36349457213409496f082f36
Signed-off-by: Kane Chen 
---
M src/mainboard/google/hatch/variants/baseboard/devicetree.cb
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/96/35596/1

diff --git a/src/mainboard/google/hatch/variants/baseboard/devicetree.cb b/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
index 7382209..a2831e1 100644
--- a/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
@@ -58,6 +58,8 @@

register "PmTimerDisabled" = "1"

+	register "PchPmSlpS0Vm075VSupport" = "1"
+
    # VR Settings Configuration for 4 Domains
    #+----------------+-------+-------+-------+-------+
    #| Domain/Setting |  SA   |  IA   | GTUS  |  GTS  |