UART01x_FR_DCD
if (delta & UART01x_FR_DCD)
uart_handle_dcd_change(port, status & UART01x_FR_DCD);
if (status & UART01x_FR_DCD)
if (delta & UART01x_FR_DCD)
uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
pl011_maybe_set_bit(status & UART01x_FR_DCD, &result, TIOCM_CAR);
#define UART01x_FR_MODEM_ANY (UART01x_FR_DCD | UART01x_FR_DSR | UART01x_FR_CTS)