UIS7862 oled屏如何设置背光

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[QUESTION]
oled屏如何设置背光

[ANSWER]

uboot阶段:

需要删除对sprd_bl.c的编译，在lcd驱动里面添加set_brightiness的接口，具体参考如下：

1. /bsp/bootloader/u-boot15/configs/uis7862s_xxx_defconfig
   
2. + #define CONFIG_BACKLIGHT_DSI
   
3. 
   
4. /bsp/bootloader/u-boot15/board/spreadtrum/uis7862s_XXX/Makefile
   
5. - obj-y := uis7862s_1h10.o sdio_cfg.o sprd_kp.o modem_entry.o pinmap.o ldo_sleep.o sprd_bl.o regulator_init.o lcd_printf.o sprd_uart_matrix_cfg.o
   
6. + obj-y := uis7862s_1h10.o sdio_cfg.o sprd_kp.o modem_entry.o pinmap.o ldo_sleep.o regulator_init.o lcd_printf.o sprd_uart_matrix_cfg.o
   
7. 
   
8. + ifndef CONFIG_BACKLIGHT_DSI
   
9. + obj-y +=sprd_bl.o
   
10. + endif
    

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添加set_brightness控制接口

1. /bsp/bootloader/u-boot15/drivers/video/sprd/lcd/lcd_xxx_xxx_xxx.c  
   
2. 
   
3. static int xxx_set_brightness(int brightness)
   
4. {
   
5.   unsigned char set_bl_seq[] = {0x51,0x0F,0XFF};
   
6.   struct sprd_dsi *dsi = &dsi_device;
   
7.   set_bl_seq[1]= brightness >> 4 & 0x0F;
   
8.   set_bl_seq[2]= brightness;
   
9.   mipi_dsi_gen_write(dsi, &set_bl_seq[0], 3);
   
10. return 0;
    
11. 
    
12. }
    
13. 
    
14. static struct panel_ops xxx_ops = {
    
15. ++  .set_brightness = xxx_set_brightness,
    
16. 
    
17. }
    
18. 
    
19. 
    
20. kernel阶段:
    
21. 
    
22. /bsp/kernel/kernel4.14/arch/arm64/boot/dts/sprd/uis7862s-xxxx.dts
    
23. 
    
24. --  pwm_backlight: backlight {
    
25. -- compatible = "sprd,sharkl5pro-backlight";
    
26. -- pwms = <&pwms 0 40000>;
    
27. -- pwm-names = "backlight";
    
28. -- sprd,max-brightness-level = <880>;
    
29. -- default-brightness-level = <115>;
    
30. -- sprd,brightness-scale = <1023>;
    
31. -- };
    
32. 
    
33. -- &panel {
    
34. -- sprd,backlight = <&pwm_backlight>;
    
35. -- };
    
36. 
    
37. 
    
38. /bsp/kernel/kernel4.14/arch/arm64/configs/sprd_sharkl5Pro_defconfig
    
39. 
    
40. -- CONFIG_BACKLIGHT_PWM=y
    
41. ++ #CONFIG_BACKLIGHT_PWM=y

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