[coreboot-gerrit] [S] Change in coreboot[master]: mb/google/brya : Update EPP value for Vell board

[Sridhar Siricilla (Code Review)]

Attention is currently required from: Tim Wawrzynczak.

Sridhar Siricilla has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/68900 )

Change subject: mb/google/brya : Update EPP value for Vell board
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mb/google/brya : Update EPP value for Vell board

The patch updates the EPP value for Vell for better power improvement.

TEST=Verified code build for Vell board

Signed-off-by: Sridhar Siricilla 
Change-Id: I41b15b84025d25cf59dac2d85826a3de9d725bae
---
M src/mainboard/google/brya/variants/vell/overridetree.cb
1 file changed, 18 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/00/68900/1

diff --git a/src/mainboard/google/brya/variants/vell/overridetree.cb b/src/mainboard/google/brya/variants/vell/overridetree.cb
index 98983ef..1ad24ef 100644
--- a/src/mainboard/google/brya/variants/vell/overridetree.cb
+++ b/src/mainboard/google/brya/variants/vell/overridetree.cb
@@ -76,6 +76,10 @@
    register "tcss_ports[3]" = "TCSS_PORT_DEFAULT(OC3)"
    register "sagv" = "SaGv_Enabled"

+	# Set EPP to 50%: 50 * 256 / 100 = 0x80
+	# It overrides the baseboard EPP value (which is 45%) for better power improvement
+	register "energy_perf_pref_value" = "0x80"
+
    # FIVR RFI Spread Spectrum 6%
    register "fivr_spread_spectrum" = "FIVR_SS_6"