需求

屏背光亮起来的时候，LED灯　黄灯灭　绿灯亮
找到屏操作背光的驱动文件：

longan/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/fastlogo/fastlogo.c

写下操作LED灯的方法，在合适的地方调用

#define setbit(x,y) x|=(1<<y)
#define clrbit(x,y) x&=~(1<<y)static void setLedStatus(void){u32 data0;u32 data1;//拉低PL1data0 = readl(0x07022000);//0x07022000setbit(data0,4);clrbit(data0,5);clrbit(data0,6);clrbit(data0,7);writel(data0,0x07022000);data1 =readl(0x07022010);data1 &= ~(0x01<< 1);writel(data1,0x07022010);//拉高PL5data0 = readl(0x07022000);//0x07022000setbit(data0,20);clrbit(data0,21);clrbit(data0,22);clrbit(data0,23);writel(data0,0x07022000);data1 =readl(0x07022010);data1 |= (0x01<< 5);writel(data1,0x07022010);}

完整的补丁如下：

--- a/H713-v1.3/longan/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/fastlogo/fastlogo.c
+++ b/H713-v1.3/longan/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/fastlogo/fastlogo.c
@@ -74,6 +74,9 @@ static char *g_dts_value[] = {};#define CFG_BLOCK_MAX_SIZE 0x40000
+#define setbit(x,y) x|=(1<<y)
+#define clrbit(x,y) x&=~(1<<y)
+static void setLedStatus(void);struct tse_src_desc {char *default_file_name;
@@ -696,6 +699,7 @@ static void fastlogo_timer_cb(void *parg)delay_ms = panel_set->power_on_delay1;break;case 3:
+               setLedStatus();p_fastlogo->p_bl->pwm_enable(p_fastlogo->p_bl, 1);delay_ms = panel_set->power_on_delay2;break;
@@ -960,6 +964,35 @@ OUT:return ret;}+static void setLedStatus(void){
+       u32 data0;
+       u32 data1;
+       //PL1 set gpio output low
+       data0 = readl(0x07022000);//0x07022000
+       setbit(data0,4);
+       clrbit(data0,5);
+       clrbit(data0,6);
+       clrbit(data0,7);
+       writel(data0,0x07022000);
+
+       data1 =readl(0x07022010);
+       data1 &= ~(0x01<< 1);
+       writel(data1,0x07022010);
+
+       //PL5 set gpio output high
+       data0 = readl(0x07022000);//0x07022000
+       setbit(data0,20);
+       clrbit(data0,21);
+       clrbit(data0,22);
+       clrbit(data0,23);
+       writel(data0,0x07022000);
+
+       data1 =readl(0x07022010);
+       data1 |= (0x01<< 5);
+       writel(data1,0x07022010);
+
+}
+