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authorSeunghwan Kim <sh_.kim@samsung.com>2018-02-27 14:27:26 +0900
committerMartin Roth <martinroth@google.com>2018-03-01 16:09:26 +0000
commit3dd88f175d1863534a8bdb5c19d718becc31e6f3 (patch)
tree02625954a3a688c552e922f0b194bf988831deb5 /src/mainboard/google/poppy
parent70ba1b7e78930acca578114cdadcbcec367730e8 (diff)
downloadcoreboot-3dd88f175d1863534a8bdb5c19d718becc31e6f3.tar.xz
mb/google/poppy/variant/nautilus: Change SlowSlewRateForSa setting
If switch to VT2 on nautilus, screen flicker appears. We found if we rollback the change of slew rate setting, then the flicker issue will be gone: https://review.coreboot.org/c/coreboot/+/22588 But nautilus board needs slew rate tuning to reduce EE noise, so we decided to change only SlowSlewRateForSa to 2 (Fast/8) instead of rollback the whole change of the CL:22588. It can remove the flicker on VT2. BUG=b:71397040 BRANCH=master TEST=emerge-nautilus coreboot Change-Id: Id1d4bd8b1316c02c783de708ec4658e030193a26 Signed-off-by: Seunghwan Kim <sh_.kim@samsung.com> Reviewed-on: https://review.coreboot.org/23877 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/mainboard/google/poppy')
-rw-r--r--src/mainboard/google/poppy/variants/nautilus/devicetree.cb3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
index 3c87b27cf3..0f246859b7 100644
--- a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
@@ -77,7 +77,8 @@ chip soc/intel/skylake
register "FastPkgCRampDisableSa" = "1"
register "SlowSlewRateForIa" = "3" # Fast/16
register "SlowSlewRateForGt" = "3" # Fast/16
- register "SlowSlewRateForSa" = "3" # Fast/16
+ register "SlowSlewRateForSa" = "2" # Fast/8
+
# VR Settings Configuration for 4 Domains
#+----------------+-------+-------+-------+-------+
#| Domain/Setting | SA | IA | GTUS | GTS |