From mboxrd@z Thu Jan  1 00:00:00 1970
From: festevam@gmail.com (Fabio Estevam)
Date: Sat, 7 Jan 2017 19:43:48 -0200
Subject: imx: RS-485 problems during TX, maybe DMA related
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Hi Clemens,

On Sat, Jan 7, 2017 at 6:59 PM, Clemens Gruber
<clemens.gruber@pqgruber.com> wrote:

> Great!
>
> Did you observe the same effect I described, with the doubling of
> characters in the front and the leftovers from previous transmissions at
> the end?

No, I don't observe these errors when I use 'rts-gpios' in the device tree.

Maybe you could try to use 'rts-gpios' for a quick test by applying
the patches I have just sent.

If you run this test, please remove 'uart-has-rtscts' from your dts.
According to Documentation/devicetree/bindings/serial/serial.txt they
are mutually-exclusive.

Regards,

Fabio Estevam