From c7878a0483c59c48a730123bc0f4659fd40921bf Mon Sep 17 00:00:00 2001 From: Johannes Schneider Date: Tue, 6 Sep 2022 14:15:04 +0200 Subject: [PATCH] serial: mxc: have putc use the TXFIFO only waiting for TXEMPTY leads to corrupted messages going over the wire - which is fixed by making use of the FIFO this change is following the linux kernel uart driver (drivers/tty/serial/imx.c), which also checks UTS_TXFULL instead of UTS_TXEMPTY Signed-off-by: Johannes Schneider Reviewed-by: Peng Fan Reviewed-by: Fabio Estevam --- drivers/serial/serial_mxc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c index ee17a960d4..af1fd1ea9b 100644 --- a/drivers/serial/serial_mxc.c +++ b/drivers/serial/serial_mxc.c @@ -311,7 +311,7 @@ static int mxc_serial_putc(struct udevice *dev, const char ch) struct mxc_serial_plat *plat = dev_get_plat(dev); struct mxc_uart *const uart = plat->reg; - if (!(readl(&uart->ts) & UTS_TXEMPTY)) + if (readl(&uart->ts) & UTS_TXFULL) return -EAGAIN; writel(ch, &uart->txd); -- 2.39.5