DIER
rcar_du_crtc_set(rcrtc, DIER, DIER_VBE);
rcar_du_crtc_clr(rcrtc, DIER, DIER_VBE);
writel(readl(imxdi->ioaddr + DIER) | intr,
imxdi->ioaddr + DIER);
writel(readl(imxdi->ioaddr + DIER) & ~intr,
imxdi->ioaddr + DIER);
alarm->enabled = (readl(imxdi->ioaddr + DIER) & DIER_CAIE) != 0;
dier = readl(imxdi->ioaddr + DIER);
writel(0, imxdi->ioaddr + DIER);
writel(0, imxdi->ioaddr + DIER);