LTDC_L1CR
regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_MASK, val);
regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_MASK, 0);
regmap_write_bits(ldev->regmap, LTDC_L1CR + layer_index * LAY_OFS, LXCR_MASK, 0);