diff options
| author | Sukumar Ghorai <sukumar.ghorai@intel.com> | 2023-12-01 11:32:42 -0800 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2023-12-16 15:34:12 +0000 |
| commit | 1c295092d61c2ac7427ddac6d194d99337f86094 (patch) | |
| tree | 9e111bc2f351e2ac61b7d8f3adcdc89a5487fef4 /src/mainboard/google/rex/variants | |
| parent | 0c8d64cc63bfb05bae42ff9ddcf99269338dd64a (diff) | |
mb/google/{rex,ovis}: Decrease EPP to 45% for MTL performance expectation
The default EPP is set at 50%, which is deemed insufficiently
aggressive for meeting the MTL performance expectations in
balance_performance mode.
# cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference
balance_performance
# iotools rdmsr 0 0x774
0x0000000080003f06
EPP=45% is giving the required performance in MTL.
# iotools rdmsr 0 0x774
0x0000000073003d06
NOTE: Kernel changes are necessary to ensure that the EPP (Energy Performance Preference) configured in the BIOS is not overwritten: https://patchwork.kernel.org/patch/13461932
BUG=b:314275133
TEST=Build and boot.
Change-Id: I1953994cdb4e9363fdd4b4728e3e5236276c06c8
Signed-off-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79386
Reviewed-by: Jakub Czapiga <czapiga@google.com>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google/rex/variants')
| -rw-r--r-- | src/mainboard/google/rex/variants/baseboard/ovis/devicetree.cb | 4 | ||||
| -rw-r--r-- | src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/src/mainboard/google/rex/variants/baseboard/ovis/devicetree.cb b/src/mainboard/google/rex/variants/baseboard/ovis/devicetree.cb index 3f75b709da..aace5adcf4 100644 --- a/src/mainboard/google/rex/variants/baseboard/ovis/devicetree.cb +++ b/src/mainboard/google/rex/variants/baseboard/ovis/devicetree.cb @@ -65,6 +65,10 @@ chip soc/intel/meteorlake register "sagv_freq_mhz[3]" = "6400" register "sagv_gear[3]" = "4" + # set EPP to 45%: 45 * 256/100 = 115 = 0x73 + register "enable_energy_perf_pref" = "true" + register "energy_perf_pref_value" = "0x73" + # Set on-board graphics as primary display register "skip_ext_gfx_scan" = "1" diff --git a/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb b/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb index 162bb64a47..9f868406a1 100644 --- a/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb +++ b/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb @@ -62,6 +62,10 @@ chip soc/intel/meteorlake register "sagv_freq_mhz[3]" = "6400" register "sagv_gear[3]" = "4" + # set EPP to 45%: 45 * 256/100 = 115 = 0x73 + register "enable_energy_perf_pref" = "true" + register "energy_perf_pref_value" = "0x73" + # Set on-board graphics as primary display register "skip_ext_gfx_scan" = "1" |