S5P_FIMV_HOST2RISC_CMD
cur_cmd = mfc_read(dev, S5P_FIMV_HOST2RISC_CMD);
mfc_write(dev, cmd, S5P_FIMV_HOST2RISC_CMD);
mfc_write(dev, 0, S5P_FIMV_HOST2RISC_CMD);