[PATCH v5 2/2] serial: mxc: have putc use the TXFIFO

[Fabio Estevam]

Johannes,

On Wed, Oct 26, 2022 at 7:23 PM SCHNEIDER Johannes
<johannes.schneider at leica-geosystems.com> wrote:
>
> Hi
>
> the thing with only checking !TXEMPTY is that it limits the fifo to one byte only; and as far as i understood, drivermodel code is supposed to return immediately and t

Why does it limit the FIFO to one byte only? The FIFO has 32 bytes.

I would like to understand what problem you were trying to solve when
you did the change:

-       if (!(readl(&uart->ts) & UTS_TXEMPTY))
+       if (readl(&uart->ts) & UTS_TXFULL)

Can you share a reproducer?

We need to figure this out soon, as this is causing a regression.