[PATCH v2 2/2] serial: mxc: Wait for TX completion before reset

[Simon Glass]

Hi,

On Tue, 10 Jan 2023 at 05:42, Loic Poulain <loic.poulain at linaro.org> wrote:
>
> The u-boot console may show some corrupted characters when
> printing in board_init() due to reset of the UART (probe)
> before the TX FIFO has been completely drained.
>
> To fix this issue, and in case UART is still running, we now
> try to flush the FIFO before proceding to UART reinitialization.
> For this we're waiting for Transmitter Complete bit, indicating
> that the FIFO and the shift register are empty.
>
> flushing has a 4ms timeout guard, which is normally more than
> enough to consume the FIFO @ low baudrate (9600bps).
>
> Signed-off-by: Loic Poulain <loic.poulain at linaro.org>
> ---
>  v2: Add this commit to the series
>
>  drivers/serial/serial_mxc.c | 24 +++++++++++++++++++++++-
>  1 file changed, 23 insertions(+), 1 deletion(-)
>

Can you just use serial_flush()? It is generic and should work with any device.

Regards,
Simon