From: Sherry Sun <sherry.sun@nxp.com>
To: gregkh@linuxfoundation.org, jirislaby@kernel.org
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-imx@nxp.com
Subject: [PATCH] tty: serial: lpuart: disable flow control when wait transmit engine complete
Date: Wed, 3 Aug 2022 09:55:12 +0800 [thread overview]
Message-ID: <20220803015512.25472-1-sherry.sun@nxp.com> (raw)
When TX fifo has dirty data, user initialize the port and wait transmit
engine complete, it should disable the flow control, otherwise tx fifo
never be empty.
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index fc7d235a1e27..f0fccd2ff7ac 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2172,6 +2172,7 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
uart_update_timeout(port, termios->c_cflag, baud);
/* wait transmit engin complete */
+ lpuart32_write(&sport->port, 0, UARTMODIR);
lpuart32_wait_bit_set(&sport->port, UARTSTAT, UARTSTAT_TC);
/* disable transmit and receive */
--
2.17.1
next reply other threads:[~2022-08-03 1:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-03 1:55 Sherry Sun [this message]
2022-08-04 6:21 ` Jiri Slaby
2022-08-04 6:33 ` Sherry Sun
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