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AM335x LCD hsync vsync not rising sync

Hi Ti,

follow VESA spec, we hope get hsync and vsync relationship as below

we hope Vsync rises when Hsync rises, but measure wave frame get Vsync rises when Hsync falls as below 

My configure setting is 

static struct lcd_ctrl_config lcd_cfg = {
    &disp_panel,
    .ac_bias        = 255,
    .ac_bias_intrpt        = 0,
    .dma_burst_sz        = 16,
    .bpp            = 32,
    .fdd            = 0x80,
    .tft_alt_mode        = 0,
    .stn_565_mode        = 0,
    .mono_8bit_mode        = 0,
//    .invert_line_clock    = 1,
//    .invert_frm_clock    = 1,
    .invert_line_clock    = 0,
    .invert_frm_clock    = 0,
    .sync_edge        = 0,
    .sync_ctrl        = 1,
    .raster_order        = 0,
};

How can I modify to meet my request? thanks