diff options
| author | Seunghwan Kim <sh_.kim@samsung.com> | 2018-02-27 14:27:26 +0900 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2018-03-01 16:09:26 +0000 |
| commit | 3dd88f175d1863534a8bdb5c19d718becc31e6f3 (patch) | |
| tree | 02625954a3a688c552e922f0b194bf988831deb5 /src | |
| parent | 70ba1b7e78930acca578114cdadcbcec367730e8 (diff) | |
| download | coreboot-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')
| -rw-r--r-- | src/mainboard/google/poppy/variants/nautilus/devicetree.cb | 3 |
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 | |