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

This sets EPP value to be 45% for all Brya variants.

Historically, EPP Ratio has always been 50% (128) on Chrome platforms.
But on Intel Alderlake EPP ratio of 45% is recommended for optimal
power and performance on Chrome platforms.

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

Signed-off-by: Cliff Huang <cliff.huang@intel.corp-partner.google.com>
Change-Id: I973cfec72a0be24c56c4cd3283d2fe6e18400d02
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62655
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
This commit is contained in:
Cliff Huang 2022-03-07 18:45:01 -08:00 committed by Felix Held
parent 0bb2225718
commit 938f33e9f7
1 changed files with 4 additions and 0 deletions
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4
src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb
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@ -119,6 +119,10 @@ chip soc/intel/alderlake
},
}"
# 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