mb/google/kukui: Fix backlight flash white before show logo
Turn backlight off before panel poweron.
BUG=b:155107047
TEST=make # board = kukui
BRANCH=kukui
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Change-Id: I0f31923bd7c1dfa26d4b1bbd0a230ae400b08ca3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41146
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/kukui/panel_anx7625.c b/src/mainboard/google/kukui/panel_anx7625.c
index c75f260..b900881 100644
--- a/src/mainboard/google/kukui/panel_anx7625.c
+++ b/src/mainboard/google/kukui/panel_anx7625.c
@@ -14,6 +14,11 @@
static void power_on_anx7625(void)
{
+ /* Disable backlight before turning on bridge */
+ gpio_output(GPIO(PERIPHERAL_EN13), 0);
+ gpio_output(GPIO(DISP_PWM), 0);
+
+ /* Turn on bridge */
gpio_output(GPIO_MIPIBRDG_RST_L_1V8, 0);
gpio_output(GPIO_PP1200_MIPIBRDG_EN, 1);
gpio_output(GPIO_VDDIO_MIPIBRDG_EN, 1);
diff --git a/src/mainboard/google/kukui/panel_ps8640.c b/src/mainboard/google/kukui/panel_ps8640.c
index 43ea68e..1f7506e 100644
--- a/src/mainboard/google/kukui/panel_ps8640.c
+++ b/src/mainboard/google/kukui/panel_ps8640.c
@@ -13,6 +13,11 @@
static void power_on_ps8640(void)
{
+ /* Disable backlight before turning on bridge */
+ gpio_output(GPIO(PERIPHERAL_EN13), 0);
+ gpio_output(GPIO(DISP_PWM), 0);
+
+ /* Turn on bridge */
gpio_output(GPIO_MIPIBRDG_RST_L_1V8, 0);
gpio_output(GPIO_PP1200_MIPIBRDG_EN, 1);
gpio_output(GPIO_VDDIO_MIPIBRDG_EN, 1);