From 642c1f519a693989f07d1c43f50bd47bafb53422 Mon Sep 17 00:00:00 2001 From: Lukasz Majewski Date: Sun, 20 May 2018 08:33:14 +0200 Subject: board: imx53: Always disable display before starting kernel This patch prevents from the situation where we may end up with garbage displayed on the LCD panel. Such situation occurs when one performs "reboot -f" in Linux and then stop in U-boot (or observe the garbage on the screen during boot up). To prevent from such situation - the PWM pin is configured as GPIO and set to LOW. Signed-off-by: Lukasz Majewski --- board/k+p/kp_imx53/kp_imx53.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'board/k+p') diff --git a/board/k+p/kp_imx53/kp_imx53.c b/board/k+p/kp_imx53/kp_imx53.c index c80eed3..6b0db6b 100644 --- a/board/k+p/kp_imx53/kp_imx53.c +++ b/board/k+p/kp_imx53/kp_imx53.c @@ -22,6 +22,7 @@ #define VBUS_PWR_EN IMX_GPIO_NR(7, 8) #define PHY_nRST IMX_GPIO_NR(7, 6) #define BOOSTER_OFF IMX_GPIO_NR(2, 23) +#define LCD_BACKLIGHT IMX_GPIO_NR(1, 1) DECLARE_GLOBAL_DATA_PTR; @@ -189,10 +190,17 @@ void eth_phy_reset(void) udelay(50); } +void board_disable_display(void) +{ + gpio_request(LCD_BACKLIGHT, "LCD_BACKLIGHT"); + gpio_direction_output(LCD_BACKLIGHT, 0); +} + int board_late_init(void) { int ret = 0; + board_disable_display(); setup_ups(); if (!power_init()) -- cgit v1.1