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mb/google/hatch: Set SA slow slew rate to 1/2 for jinlon/dratini 

Screen flickered on VT2 on some devices  after idle a period of time.

Remove SSR (1/8) setting for SA to default SSR (1/2), screen flicking
issue disappeared, and didn't affect acoustic noise much.

Because CB:38212 (commit eae254e) caused this issue.

BUG=b:160754994
TEST=build dratini, observe that screen flick issue disapppered

Change-Id: I9e81c2f15dd6babfa360eee213fc4ab6310c7455
Signed-off-by: Wisley Chen <wisley.chen@quantatw.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43284
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Wisley Chen 2020-07-08 16:18:46 +08:00 committed by Patrick Georgi
parent 370868766b
commit 51c6d4429c
2 changed files with 0 additions and 2 deletions
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1
src/mainboard/google/hatch/variants/dratini/overridetree.cb
View File

@ -23,7 +23,6 @@ chip soc/intel/cannonlake
register "AcousticNoiseMitigation" = "1" register "AcousticNoiseMitigation" = "1"
register "SlowSlewRateForIa" = "2" register "SlowSlewRateForIa" = "2"
register "SlowSlewRateForGt" = "2" register "SlowSlewRateForGt" = "2"
register "SlowSlewRateForSa" = "2"
register "FastPkgCRampDisableIa" = "1" register "FastPkgCRampDisableIa" = "1"
register "FastPkgCRampDisableGt" = "1" register "FastPkgCRampDisableGt" = "1"
register "FastPkgCRampDisableSa" = "1" register "FastPkgCRampDisableSa" = "1"

1
src/mainboard/google/hatch/variants/jinlon/overridetree.cb
View File

@ -23,7 +23,6 @@ chip soc/intel/cannonlake
register "AcousticNoiseMitigation" = "1" register "AcousticNoiseMitigation" = "1"
register "SlowSlewRateForIa" = "2" register "SlowSlewRateForIa" = "2"
register "SlowSlewRateForGt" = "2" register "SlowSlewRateForGt" = "2"
register "SlowSlewRateForSa" = "2"
register "FastPkgCRampDisableIa" = "1" register "FastPkgCRampDisableIa" = "1"
register "FastPkgCRampDisableGt" = "1" register "FastPkgCRampDisableGt" = "1"
register "FastPkgCRampDisableSa" = "1" register "FastPkgCRampDisableSa" = "1"