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serial: mxc: have putc use the TXFIFO

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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@nxp.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
This commit is contained in:
Johannes Schneider 2022-09-06 14:15:04 +02:00 • committed by Stefano Babic
parent 25b7ce3287
commit c7878a0483
1 changed files with 1 additions and 1 deletions
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2
drivers/serial/serial_mxc.c
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@ -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_serial_plat *plat = dev_get_plat(dev);
struct mxc_uart *const uart = plat->reg; struct mxc_uart *const uart = plat->reg;
if (!(readl(&uart->ts) & UTS_TXEMPTY)) if (readl(&uart->ts) & UTS_TXFULL)
return -EAGAIN; return -EAGAIN;
writel(ch, &uart->txd); writel(ch, &uart->txd);