diff options
| author | Ruihai Zhou <zhouruihai@huaqin.corp-partner.google.com> | 2022-06-10 15:27:33 +0800 |
|---|---|---|
| committer | Martin L Roth <gaumless@tutanota.com> | 2022-06-12 22:38:41 +0000 |
| commit | 7df7d8dd4b2d67f336995daeee381a07787d9db3 (patch) | |
| tree | fdf4afd636d81bdd5f927c5a9622f865cbdd03c7 | |
| parent | a49460c6b6e54bf09945263e8a57119e813f6de5 (diff) | |
mb/google/corsola: Fix PS8640 power-on T6 sequence
The T6 of PS8640 power on sequence should be larger than 0ms, but it's
-0.062ms now. Add 100us delay between VRF12 and VCN33. The PS8640
power-on sequence is described in the "PS8640_DS_V1.4_20200210.docx".
BUG=b:235448279
BRANCH=None
TEST=The sequence T6 is larger than 0ms when power on.
Signed-off-by: Ruihai Zhou <zhouruihai@huaqin.corp-partner.google.com>
Change-Id: I0b8a37d6119dc027a9d1c0a62c087b0a7ef14cac
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65084
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: zanxi chen <chenzanxi@huaqin.corp-partner.google.com>
Reviewed-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
| -rw-r--r-- | src/mainboard/google/corsola/display.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mainboard/google/corsola/display.c b/src/mainboard/google/corsola/display.c index 2af9fe09b2..5a88cad7b9 100644 --- a/src/mainboard/google/corsola/display.c +++ b/src/mainboard/google/corsola/display.c @@ -22,6 +22,7 @@ static void bridge_ps8640_power_on(void) /* * PS8640 power-on sequence is described in chapter 14, PS8640_DS_V1.4_20200210.docx * - set VDD12 to be 1.2V + * - delay 100us * - set VDD33 to be 3.3V * - pull hign PD# * - pull down RST# @@ -35,6 +36,7 @@ static void bridge_ps8640_power_on(void) /* Set VRF12 to 1.2V and VCN33 to 3.3V */ mainboard_set_regulator_vol(MTK_REGULATOR_VRF12, 1200000); + udelay(100); mainboard_set_regulator_vol(MTK_REGULATOR_VCN33, 3300000); udelay(200); |