diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index c86f1538bfdd..be13eb39fbf4 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -80,6 +80,7 @@ #define URXD_FRMERR (1<<12) #define URXD_BRK (1<<11) #define URXD_PRERR (1<<10) +#define URXD_RX_DATA (0xFF<<0) #define UCR1_ADEN (1<<15) /* Auto detect interrupt */ #define UCR1_ADBR (1<<14) /* Auto detect baud rate */ #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */ @@ -1499,32 +1500,10 @@ imx_verify_port(struct uart_port *port, struct serial_struct *ser) #if defined(CONFIG_CONSOLE_POLL) static int imx_poll_get_char(struct uart_port *port) { - struct imx_port_ucrs old_ucr; - unsigned int status; - unsigned char c; + if (!(readl(port->membase + USR2) & USR2_RDR)) + return NO_POLL_CHAR; - /* save control registers */ - imx_port_ucrs_save(port, &old_ucr); - - /* disable interrupts */ - writel(UCR1_UARTEN, port->membase + UCR1); - writel(old_ucr.ucr2 & ~(UCR2_ATEN | UCR2_RTSEN | UCR2_ESCI), - port->membase + UCR2); - writel(old_ucr.ucr3 & ~(UCR3_DCD | UCR3_RI | UCR3_DTREN), - port->membase + UCR3); - - /* poll */ - do { - status = readl(port->membase + USR2); - } while (~status & USR2_RDR); - - /* read */ - c = readl(port->membase + URXD0); - - /* restore control registers */ - imx_port_ucrs_restore(port, &old_ucr); - - return c; + return readl(port->membase + URXD0) & URXD_RX_DATA; } static void imx_poll_put_char(struct uart_port *port, unsigned char c)