非常奇怪，uboot里面没有9881的驱动程序。kernel_menuconfig也没找到改驱动。
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[ 3.579183] [DISP] lcd_clk_config,line:744:
[ 3.579194] disp 0, clk: pll(408000000),clk(408000000),dclk(68000000) dsi_rate(68000000)
[ 3.579194] clk real:pll(408000000),clk(408000000),dclk(102000000) dsi_rate(150000000)
[ 3.579402] LCD_open_flow
[ 3.579407] LCD_power_on
[ 3.579961] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pd not found, using dummy regulator
[ 3.794403] dsi_dcs_wr,cmd:0x11
[ 3.924400] sunxi_lcd_delay_ms:120
[ 3.924404] dsi_dcs_wr,cmd:0x29
[ 3.944395] sunxi_lcd_delay_ms:10
[ 4.214400] LCD_bl_open
[ 4.381165] Console: switching to colour frame buffer device 100x80背光亮了，但是没显示，不知道什么原因。
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