From a3c9021771608f5b514c75874fa0d8fbee2873d6 Mon Sep 17 00:00:00 2001 From: Gerard Salvatella Date: Mon, 19 Nov 2018 15:54:10 +0100 Subject: board: toradex: turn off lcd backlight before OS handover U-Boot typically tears down the display controller before handing control over to Linux. On LCD displays disabling pixel clock leads to a fading out effect with vertical/horizontal lines. Make sure to disable back light before booting Linux. Signed-off-by: Gerard Salvatella Signed-off-by: Philippe Schenker Signed-off-by: Tom Warren --- board/toradex/apalis_imx6/apalis_imx6.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'board/toradex/apalis_imx6') diff --git a/board/toradex/apalis_imx6/apalis_imx6.c b/board/toradex/apalis_imx6/apalis_imx6.c index 368db9c488..d11207c7f4 100644 --- a/board/toradex/apalis_imx6/apalis_imx6.c +++ b/board/toradex/apalis_imx6/apalis_imx6.c @@ -745,6 +745,15 @@ static void setup_display(void) gpio_direction_output(RGB_BACKLIGHTPWM_OE, 0); gpio_direction_output(RGB_BACKLIGHT_GP, 1); } + +/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_direction_output(RGB_BACKLIGHTPWM_GP, 1); + gpio_direction_output(RGB_BACKLIGHT_GP, 0); +} #endif /* defined(CONFIG_VIDEO_IPUV3) */ int board_early_init_f(void) -- cgit v1.2.1