tty: serial: fsl_lpuart: fix lpuart32_poll_get_char

commit 29788ab1d2bf26c130de8f44f9553ee78a27e8d5 upstream.

The watermark is set to 1, so we need to input two chars to trigger RDRF
using the original logic. With the new logic, we could always get the
char when there is data in FIFO.

Suggested-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20200929095509.21680-1-peng.fan@nxp.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 93d7922d1d9096a40060eb171b0080293116e8fc..ec8e608b46baa4cfdcc42b3a5c966acacb534000 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -666,7 +666,7 @@ static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c)
 
 static int lpuart32_poll_get_char(struct uart_port *port)
 {
-       if (!(lpuart32_read(port, UARTSTAT) & UARTSTAT_RDRF))
+       if (!(lpuart32_read(port, UARTWATER) >> UARTWATER_RXCNT_OFF))
                return NO_POLL_CHAR;
 
        return lpuart32_read(port, UARTDATA);