From f3c0a01dc6c4b07af8320f083d9b21e65299e0ed Mon Sep 17 00:00:00 2001 From: Tao Xia Date: Wed, 11 Nov 2020 15:32:46 +0800 Subject: mb/google/kukui: Fix LCD sequence T3 fail issue The T3 that PPVARN_LCD low to LCM_RST_1V8 high is 0.1269ms and it does not meet the LCD specification that the T3 must be larger than 5ms. Because there is a delay between PPVARN_LCD_EN and PPVARN_LCD. An extra 9ms delay should be added on LCM_RST_1V8 in order to meet the specification "ProductSpec_NV105WUM-A51_ V4.3_P2(TLCM).pdf". BUG=b:172201138 BRANCH=kukui TEST=The LCD sequence T3 is larger than 5ms when power on. Signed-off-by: Tao Xia Change-Id: Iaf7ae494e30c4c207103d949287b335288688c54 Reviewed-on: https://review.coreboot.org/c/coreboot/+/47443 Tested-by: build bot (Jenkins) Reviewed-by: Hung-Te Lin Reviewed-by: Yu-Ping Wu --- src/mainboard/google/kukui/mainboard.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/mainboard') diff --git a/src/mainboard/google/kukui/mainboard.c b/src/mainboard/google/kukui/mainboard.c index 268b7caf65..cbcb5da1c6 100644 --- a/src/mainboard/google/kukui/mainboard.c +++ b/src/mainboard/google/kukui/mainboard.c @@ -91,7 +91,7 @@ static void power_on_panel(struct panel_description *panel) gpio_output(GPIO_PPVARN_LCD_EN, 1); gpio_output(GPIO_PP1800_LCM_EN, 1); gpio_output(GPIO_PP3300_LCM_EN, 1); - mdelay(6); + mdelay(15); gpio_output(GPIO_LCM_RST_1V8, 1); mdelay(6); } -- cgit v1.2.3