OVL2C1
int enabled = lcd_readl(ofb->fbi, OVL2C1) & OVLxC1_OEN;
lcd_writel(ofb->fbi, OVL2C1, ofb->control[0] | OVLxC1_OEN);
if (!(lcd_readl(ofb->fbi, OVL2C1) & OVLxC1_OEN))
lcd_writel(ofb->fbi, OVL2C1, ofb->control[0] & ~OVLxC1_OEN);