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How to enable LCDC DE mode of AM335x?

Other Parts Discussed in Thread: AM3359, AM3354

Hi:

I use a LCD  with DEN mode on am3359, and the LCD DEN pin connect to AM335X_LCD_AC_BIAS_EN pin;

Now I can measure the PixCLK(DCLK of LCD) with 6MHz, and the AM335X_LCD_AC_BIAS_EN output about 16Khz, but the LCD can not be display, it is nothing to show only default white background on LCD.

Maybe the Am3359's DE mode have a special configure of LCDC?

My LCD is 320X240, and about 6Mhz pixel clock ; below is my configure of board-am335x.c

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,
.sync_edge = 0,
.sync_ctrl = 1,
.raster_order = 0,
};

if ac_bias and ac_bias_intrpt need to modified a special vaule?