[coreboot-gerrit] Change in coreboot[master]: mb/google/hatch: Enable PmTimerDisabled config to reduce S0ix power u...

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/34611 )

Change subject: mb/google/hatch: Enable PmTimerDisabled config to reduce S0ix power usage
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mb/google/hatch: Enable PmTimerDisabled config to reduce S0ix power usage

BRANCH=none
BUG=b:138152075
TEST=Build for cometlake board with the PmTimerDisabled policy in
devicetree set to 1.

With PmTimerDisabled = 0
> > iotools mmio_read8 0xfe0018fc

0x00

With PmTimerDisabled = 1
> > iotools mmio_read8 0xfe0018fc

0x02

Bit 1: ACPI Timer Disable (ACPI_TIM_DIS): This bit determines
whether the ACPI Timer is enabled to run.
- 0: ACPI Timer is enabled
- 1: ACPI Timer is disabled

Change-Id: I83f49505a804c99d7978e5d541ea9fe8ead9b88f
Signed-off-by: Subrata Banik 
---
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/11/34611/1

diff --git a/src/mainboard/google/hatch/variants/baseboard/devicetree.cb b/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
index 6ff90f8..eb4be43 100644
--- a/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
@@ -47,6 +47,8 @@
    # Unlock GPIO pads
    register "PchUnlockGpioPads" = "1"

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