DC_CMD_INT_STATUS_REG
const uint32_t status = DC_READ(tegra_crtc, DC_CMD_INT_STATUS_REG);
DC_WRITE(tegra_crtc, DC_CMD_INT_STATUS_REG, DC_CMD_INT_V_BLANK);
DC_WRITE(tegra_crtc, DC_CMD_INT_STATUS_REG, DC_CMD_INT_V_BLANK);