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mb/google/zork: fine tune stamp_boost parameter for dirinboz 

The new discovery from Google & AMD, the value currently used
STAPM Time Constant of 1640 is reducing real PPT TSP from the
target 4.8W to 4.68W.

Furthermore, when using the "default" STAPM Time Constant of 1400,
the actual real PPT TSP becomes 4.89W.

Operating at this default settings therefore uses a higher real PPT TSP,
which results in a significant performance improvement.

BUG=b:175364713,b:184902568
BRANCH=zork
TEST=1. emerge-zork coreboot
     2. run balance performance and skin temperature test => pass

Signed-off-by: Kevin Chiu <kevin.chiu@quantatw.com>
Change-Id: I9cf4d51f42fe250340bcb642db07796c9a480c34
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52312
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Sam McNally <sammc@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Kevin Chiu 2021-04-14 10:37:08 +08:00 committed by Patrick Georgi
parent fde6b65b52
commit 2414148220
1 changed files with 1 additions and 1 deletions
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2
src/mainboard/google/zork/variants/dirinboz/overridetree.cb
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@ -12,7 +12,7 @@ chip soc/amd/picasso
register "slow_ppt_limit_mW" = "6000"
register "fast_ppt_limit_mW" = "9000"
register "slow_ppt_time_constant_s" = "5"
register "stapm_time_constant_s" = "1640"
register "stapm_time_constant_s" = "1400"
register "sustained_power_limit_mW" = "4800"
register "telemetry_vddcr_vdd_slope_mA" = "41322"