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 johannes.schneider@leica-geosystems.com Reviewed-by: Peng Fan peng.fan@oss.nxp.com ---
(no changes since v1)
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 fa344c8b8f..0520c7929a 100644 --- a/drivers/serial/serial_mxc.c +++ b/drivers/serial/serial_mxc.c @@ -310,7 +310,7 @@ 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);