#RK3576Linux如何在uboot阶段关闭屏幕背光

问题：目前RK3576在配置uboot阶段关机充电遇到了背光没有被关闭

解决办法是在显示图片后拉低背光的使能gpio

u-boot/drivers/power$ git diff . diff --git a/drivers/power/charge_animation.c b/drivers/power/charge_animation.c index 89c5db231f..1ac5e9e300 100644 --- a/drivers/power/charge_animation.c +++ b/drivers/power/charge_animation.c @@ -43,6 +43,8 @@ DECLARE_GLOBAL_DATA_PTR; #define LED_CHARGING_NAME "battery_charging" #define LED_CHARGING_FULL_NAME "battery_full" +static bool backlight_off_done = false; + struct charge_image { const char *name; int soc; @@ -905,6 +907,14 @@ show_images: old_show_idx = show_idx; debug("SHOW: %s\n", image[show_idx].name); charge_show_bmp(image[show_idx].name); + + if (!backlight_off_done) { + printf("**** lcw: Turn off backlight now!\n"); + gpio_request(14, "GPIO14"); + gpio_direction_output(14, 0); + gpio_free(14); + backlight_off_done = true; + } } /* Re-calculate timeout to off screen */ if (priv->auto_screen_off_timeout == 0)