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-rw-r--r--src/mainboard/google/reef/devicetree.cb3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mainboard/google/reef/devicetree.cb b/src/mainboard/google/reef/devicetree.cb
index a877e863bf..4d08fae834 100644
--- a/src/mainboard/google/reef/devicetree.cb
+++ b/src/mainboard/google/reef/devicetree.cb
@@ -50,6 +50,9 @@ chip soc/intel/apollolake
# Enable I2C2 bus early for TPM access
register "i2c[2].early_init" = "1"
+ # Minimum SLP S3 assertion width 28ms.
+ register "slp_s3_assertion_width_usecs" = "28000"
+
device domain 0 on
device pci 00.0 on end # - Host Bridge
device pci 00.1 on end # - DPTF