diff options
| author | Cliff Huang <cliff.huang@intel.corp-partner.google.com> | 2022-03-07 18:45:01 -0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-03-14 15:48:29 +0000 |
| commit | 938f33e9f7756d730a1da278679087476a476bf2 (patch) | |
| tree | 8a60e4df5e635e57c2a1ae11a6879cc947dcadbc /src/mainboard/google/brya | |
| parent | 0bb2225718ef898c102ed88ed9deebfe1a714df0 (diff) | |
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>
Diffstat (limited to 'src/mainboard/google/brya')
| -rw-r--r-- | src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb b/src/mainboard/google/brya/variants/baseboard/brya/devicetree.cb index 0558307f1c..d67fd4b7a2 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 @@ 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 |