From 69668852903b97ef053164de27814804e59a0634 Mon Sep 17 00:00:00 2001 From: Yang Wu Date: Wed, 31 Dec 2025 21:13:30 +0800 Subject: [PATCH] mb/google/skywalker: Extend MIPI panel delay to meet T3 timing Measured on Padme, the T3 (AVEE-to-RESET) timing in the current MIPI panel power-on sequence is only ~120us, which is significantly shorter than the panel specification requirement (>=3ms). This may cause panel initialization instability due to RESET being asserted too early after AVEE is enabled. Increase the delay between AVEE enable and panel reset from 1ms to 5ms to satisfy the panel T3 (AVEE-to-RESET) timing requirement. IL79900A Power on off sequence V1.pdf BUG=b:451746079 TEST=Boot Padme and confirm panel power-on timing is correct. BRANCH=skywalker Change-Id: Ided93c34f7c6695a2928c23eea679f32a0ee9a17 Signed-off-by: Yang Wu Reviewed-on: https://review.coreboot.org/c/coreboot/+/90664 Tested-by: build bot (Jenkins) Reviewed-by: Yidi Lin Reviewed-by: Yu-Ping Wu --- src/mainboard/google/skywalker/panel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/mainboard/google/skywalker/panel.c b/src/mainboard/google/skywalker/panel.c index 32d684217e..5856cf4044 100644 --- a/src/mainboard/google/skywalker/panel.c +++ b/src/mainboard/google/skywalker/panel.c @@ -60,7 +60,7 @@ void mipi_panel_power_on(void) mdelay(10); } gpio_output(GPIO_EN_PP3300_EDP_X, 0); - mdelay(1); + mdelay(5); gpio_output(GPIO_EN_PP3300_EDP_X, 1); mdelay(1); gpio_output(GPIO_TCHSCR_RST_1V8_L, 0);