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

[Sridhar Siricilla (Code Review)]

Attention is currently required from: Gaggery Tsai, Kedar J. Karanje, Tarun Tuli, Jérémy Compostella, Tim Wawrzynczak, Sridhar Siricilla, Kane Chen.

Hello Gaggery Tsai, build bot (Jenkins), Kedar J. Karanje, Tarun Tuli, Subrata Banik, Jérémy Compostella, Tim Wawrzynczak, Kane Chen,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/68900

to look at the new patch set (#5).

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

The patch sets the EPP to 50% (0x80) for Vell. With EPP at 50%, the Vell
system demonstrated better power improvement without sacrificing the
performance.

PLT Results(Perf) with EPP@40% and EPP@50%:
    EPP@40%: Device1-656 mins, Device2-664 mins.
    EPP@50%: Device1-678 mins, Device2-677 mins.

In short, with EPP@50%, PLT KPI ran for more than 13 to 22mins compared
to EPP@40%.

Branch=firmware-brya-14505.B
BUG=b:215526166
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, 29 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/00/68900/5