AT070TN92的LCD不亮

u-boot里LCD能显示自己做的图片，但是到内核起来后，LCD直接黑了，但/dev/fb0存在，24bpp，文件修改如下：

static const struct display_panel disp_panel = {
 WVGA,
 32,
 24,   COLOR_ACTIVE,
};

/* LCD backlight platform Data *///////////////hhadd////////////
/*#define AM335X_BACKLIGHT_MAX_BRIGHTNESS        100
#define AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS    100
#define AM335X_PWM_PERIOD_NANO_SECONDS        (5000 * 10)*/

static struct lcd_ctrl_config lcd_cfg = {
 &disp_panel,
 .ac_bias  = 255,
 .ac_bias_intrpt  = 0,
 .dma_burst_sz  = 16,
 .bpp   = 24,   .fdd   = 0x80,
 .tft_alt_mode  = 0,
 .stn_565_mode  = 0,
 .mono_8bit_mode  = 0,
 .invert_line_clock = 1,
 .invert_frm_clock = 1,
 .sync_edge  = 0,
 .sync_ctrl  = 1,
 .raster_order  = 0,
};

struct da8xx_lcdc_platform_data  hc6105_lcd_pdata = {
 .manu_name              = "HC6105DVI",
 .controller_data        = &lcd_cfg,
 .type                   = "HC6105DVI-1024×768",
};

[4] = {
   .name = "HC6105DVI-1024×768",
   .width = 800,
   .height = 480,
   .hfp = 210,
   .hbp = 46,
   .hsw = 32,
   .vfp = 22,
   .vbp = 23,
   .vsw = 4,
   .pxl_clk = 30000000,
   .invert_pxl_clk = 0,
  },

屏的参数如下：

user4478311：

求高手解决