Change in coreboot[master]: mb/google/brya: Set EPP to 45% for all Brya variants

[Cliff Huang (Code Review)]

Attention is currently required from: Cliff Huang.
Hello Cliff Huang,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/coreboot/+/62655

to review the following change.

Change subject: mb/google/brya: Set EPP to 45% for all Brya variants
......................................................................

mb/google/brya: Set EPP to 45% for all Brya variants

This sets EPP value to be 45% for all brya variants:

BUG=b:219785001
BRANCH=firmware
BRANCH=firmware-brya-14505.Bre-brya-14505.B
TEST:
Use 'iotools rdmsr [cpu id] 0x774' command and check field 32:24 = 0x73.

Signed-off-by: Cliff Huang 
Change-Id: I973cfec72a0be24c56c4cd3283d2fe6e18400d02
---
M src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/55/62655/1

diff --git a/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb b/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb
index 0558307..82e7c91 100644
--- a/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb
+++ b/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb
@@ -119,6 +119,10 @@
    	},
    }"

+	# set EPP to 45%: 45 * 256/100 = 115 = 0x73 
+	register "enable_energy_perf_pref" = "true"
+	register "energy_perf_pref_value" = "0x73"
+
    device domain 0 on
    	device ref igpu on end
    	device ref dtt on end