LTDC_EDCR
regmap_write(ldev->regmap, LTDC_EDCR, EDCR_OCYEN | val);
regmap_write(ldev->regmap, LTDC_EDCR, EDCR_OCYEN | EDCR_OCYCO | val);
regmap_write(ldev->regmap, LTDC_EDCR, 0);