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apalis-imx8: turn off lcd backlight before os handover

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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>
Reviewed-by: Fabio Estevam <festevam@denx.de>
This commit is contained in:
Marcel Ziswiler
2023-01-16 20:04:57 +01:00
committed by Stefano Babic
parent fe7b2b322e
commit 717783ecdc
1 changed files with 18 additions and 1 deletions
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19
board/toradex/apalis-imx8/apalis-imx8.c
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@@ -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");