ATMEL_LCDC_CONTRAST_VAL
lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);