truly_dcs_write
ret = truly_dcs_write(panel, MIPI_DCS_SET_DISPLAY_OFF);
ret = truly_dcs_write(panel, MIPI_DCS_ENTER_SLEEP_MODE);
ret = truly_dcs_write(panel, MIPI_DCS_EXIT_SLEEP_MODE);
ret = truly_dcs_write(panel, MIPI_DCS_SET_DISPLAY_ON);