tty: serial: fsl_lpuart: avoid idle preamble pending if CTS is enabled

commit 74cb7e0355fae9641f825afa389d3fba3b617714 upstream.

If the remote uart device is not connected or not enabled after booting
up, the CTS line is high by default. At this time, if we enable the flow
control when opening the device(for example, using “stty -F /dev/ttyLP4
crtscts” command), there will be a pending idle preamble(first writing 0
and then writing 1 to UARTCTRL_TE will queue an idle preamble) that
cannot be sent out, resulting in the uart port fail to close(waiting for
TX empty), so the user space stty will have to wait for a long time or
forever.

This is an LPUART IP bug(idle preamble has higher priority than CTS),
here add a workaround patch to enable TX CTS after enabling UARTCTRL_TE,
so that the idle preamble does not get stuck due to CTS is deasserted.

Fixes: 380c966c093e ("tty: serial: fsl_lpuart: add 32-bit register interface support")
Cc: stable <stable@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Link: https://lore.kernel.org/r/20240305015706.1050769-1-sherry.sun@nxp.com
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 e0d576b88d7d5e343daafeb9c09ca4c63e85e183..9f1be9ce47e03804ab07378ca1dfcd3cec46f5f0 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2237,9 +2237,12 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
 
        lpuart32_write(&sport->port, bd, UARTBAUD);
        lpuart32_serial_setbrg(sport, baud);
-       lpuart32_write(&sport->port, modem, UARTMODIR);
-       lpuart32_write(&sport->port, ctrl, UARTCTRL);
+       /* disable CTS before enabling UARTCTRL_TE to avoid pending idle preamble */
+       lpuart32_write(&sport->port, modem & ~UARTMODIR_TXCTSE, UARTMODIR);
        /* restore control register */
+       lpuart32_write(&sport->port, ctrl, UARTCTRL);
+       /* re-enable the CTS if needed */
+       lpuart32_write(&sport->port, modem, UARTMODIR);
 
        if (old && sport->lpuart_dma_rx_use) {
                if (!lpuart_start_rx_dma(sport))