/**********************************************************************              I.MX6 U-boot Kernel backlight setting* 说明：*     本文主要记录I.MX6 U-boot、Kernel中如何打开、关闭背光设置。* *                                   2016-3-7 深圳 南山平山村 曾剑锋********************************************************************/1. cat bootable/bootloader/uboot-imx/board/freescale/mx6q_sabresd/mx6q_sabresd.c......#ifdef CONFIG_LCDvoid lcd_enable(void){....../** Set LVDS panel CABC_EN0 to low to disable* CABC function. This function will turn backlight* automatically according to display content, so* simply disable it to get rid of annoying unstable* backlight phenomena.* * • GPIO direction register (GPIO_GDIR)* • Data register (GPIO_DR)** 2015-10-8 zengjf modify fot lvds backlight*/reg = readl(GPIO6_BASE_ADDR + GPIO_GDIR);reg |= (1 << 15);writel(reg, GPIO6_BASE_ADDR + GPIO_GDIR);reg = readl(GPIO6_BASE_ADDR + GPIO_DR);//reg &= ~(1 << 15);reg |= (1 << 15);writel(reg, GPIO6_BASE_ADDR + GPIO_DR);/** Set LVDS panel CABC_EN1 to low to disable* CABC function.*/reg = readl(GPIO6_BASE_ADDR + GPIO_GDIR);reg |= (1 << 16);writel(reg, GPIO6_BASE_ADDR + GPIO_GDIR);reg = readl(GPIO6_BASE_ADDR + GPIO_DR);//reg &= ~(1 << 16);reg |= (1 << 16);writel(reg, GPIO6_BASE_ADDR + GPIO_DR);......}......2. cat arch/arm/mach-mx6/board-mx6q_sabresd.c....../*!* Board specific initialization.*/static void __init mx6_sabresd_board_init(void){....../** Disable HannStar touch panel CABC function,* this function turns the panel's backlight automatically* according to the content shown on the panel which* may cause annoying unstable backlight issue.* * zengjf 2015-10-8 this also has down in uboot */gpio_request(SABRESD_CABC_EN0, "cabc-en0");gpio_direction_output(SABRESD_CABC_EN0, 1);gpio_request(SABRESD_CABC_EN1, "cabc-en1");gpio_direction_output(SABRESD_CABC_EN1, 1);......}......