USR2_RDR          746 drivers/tty/serial/imx.c 	while (imx_uart_readl(sport, USR2) & USR2_RDR) {
USR2_RDR         1826 drivers/tty/serial/imx.c 	if (!(imx_uart_readl(sport, USR2) & USR2_RDR))