From: Marcel Ziswiler marcel.ziswiler@toradex.com
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 GPIO Apalis BKL1 before booting Linux.
Signed-off-by: Marcel Ziswiler marcel.ziswiler@toradex.com Signed-off-by: Francesco Dolcini francesco.dolcini@toradex.com --- v2: no changes --- board/toradex/apalis-imx8/apalis-imx8.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/board/toradex/apalis-imx8/apalis-imx8.c b/board/toradex/apalis-imx8/apalis-imx8.c index 6f28367cf034..1622900bd1da 100644 --- a/board/toradex/apalis-imx8/apalis-imx8.c +++ b/board/toradex/apalis-imx8/apalis-imx8.c @@ -182,9 +182,18 @@ int board_early_init_f(void) }
#if CONFIG_IS_ENABLED(DM_GPIO) + +#define BKL1_GPIO IMX_GPIO_NR(1, 10) + +static iomux_cfg_t board_gpios[] = { + SC_P_LVDS1_GPIO00 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(GPIO_PAD_CTRL), +}; + static void board_gpio_init(void) { - /* TODO */ + imx8_iomux_setup_multiple_pads(board_gpios, ARRAY_SIZE(board_gpios)); + + gpio_request(BKL1_GPIO, "BKL1_GPIO"); } #else static inline void board_gpio_init(void) {} @@ -202,6 +211,14 @@ int board_phy_config(struct phy_device *phydev) } #endif
+/* + * Backlight off before OS handover + */ +void board_preboot_os(void) +{ + gpio_direction_output(BKL1_GPIO, 0); +} + int checkboard(void) { puts("Model: Toradex Apalis iMX8\n");