Symbol: PCH_UART_IIR_IP
drivers/tty/serial/pch_uart.c
1016
if (iid & PCH_UART_IIR_IP) /* No Interrupt */
drivers/tty/serial/pch_uart.c
578
(PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);