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mb/google/poppy/variants/nautilus: Change IA/GT/SA slow slew rate settings 

Change IA/GT/SA slow slew rate settings.
System's audible noise will be reduced with them.

- Slow slew rate for IA/GT/SA : fast/16
- Fast PKG C-state ramp for IA/GT/SA: disabled

BRANCH=master
BUG=none
TEST=compiled/verified

Change-Id: Ibf11aba7bafb3b02c510905d7d904507eee6394b
Signed-off-by: Chris Wang <chriswang@ami.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/22588
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: shkim <sh_.kim@samsung.com>
This commit is contained in:
Chris Wang 2017-11-24 13:43:50 +08:00 committed by Furquan Shaikh
parent 3b62d6b40a
commit 51de1802f3
1 changed files with 8 additions and 0 deletions
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8
src/mainboard/google/poppy/variants/nautilus/devicetree.cb
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@ -70,6 +70,14 @@ chip soc/intel/skylake
register "pirqg_routing" = "PCH_IRQ11"
register "pirqh_routing" = "PCH_IRQ11"
# VR Slew rate setting for improving audible noise
register "AcousticNoiseMitigation" = "1"
register "FastPkgCRampDisableIa" = "1"
register "FastPkgCRampDisableGt" = "1"
register "FastPkgCRampDisableSa" = "1"
register "SlowSlewRateForIa" = "3" # Fast/16
register "SlowSlewRateForGt" = "3" # Fast/16
register "SlowSlewRateForSa" = "3" # Fast/16
# VR Settings Configuration for 4 Domains
#+----------------+-------+-------+-------+-------+
#| Domain/Setting | SA | IA | GTUS | GTS |