tty: serial: fsl_lpuart: clear receive flag on FIFO flush

commit 8e4934c6d6c659e22b1b746af4196683e77ce6ca upstream.

When the receiver was enabled during startup, a character could
have been in the FIFO when the UART get initially used. The
driver configures the (receive) watermark level, and flushes the
FIFO. However, the receive flag (RDRF) could still be set at that
stage (as mentioned in the register description of UARTx_RWFIFO).
This leads to an interrupt which won't be handled properly in
interrupt mode: The receive interrupt function lpuart_rxint checks
the FIFO count, which is 0 at that point (due to the flush
during initialization). The problem does not manifest when using
DMA to receive characters.

Fix this situation by explicitly read the status register, which
leads to clearing of the RDRF flag. Due to the flush just after
the status flag read, a explicit data read is not to required.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 05a033e7446c1d564f8b4b95b4096bfdde22f9c7..2b49f2abd8b507f468dcfd609dbb2f4696d8f293 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -608,6 +608,9 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
        writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
                        sport->port.membase + UARTPFIFO);
 
+       /* explicitly clear RDRF */
+       readb(sport->port.membase + UARTSR1);
+
        /* flush Tx and Rx FIFO */
        writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
                        sport->port.membase + UARTCFIFO);