VFE_BUS_WM_PACKER_CFG
writel_relaxed(val, vfe->base + VFE_BUS_WM_PACKER_CFG(wm)); // XXX 1 for PLAIN8?
writel_relaxed(0, vfe->base + VFE_BUS_WM_PACKER_CFG(wm));
writel(0, vfe->base + VFE_BUS_WM_PACKER_CFG(wm));