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Re: imx: RS-485 problems during TX, maybe DMA related

From Fabio Estevam <festevam@gmail.com>
Newsgroups linux.kernel
Subject Re: imx: RS-485 problems during TX, maybe DMA related
Date 2017-01-07 22:50 +0100
Message-ID <sX729-5Mo-3@gated-at.bofh.it> (permalink)
References (4 earlier) <sWZxE-13b-31@gated-at.bofh.it> <sX0Do-1H7-11@gated-at.bofh.it> <sX1g5-2aP-19@gated-at.bofh.it> <sX2lP-2PR-19@gated-at.bofh.it> <sX6fL-5fd-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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

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Thread

imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-04 17:20 +0100
  Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-06 22:30 +0100
    Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-07 00:00 +0100
      Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-07 01:40 +0100
        Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-07 14:50 +0100
          Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-07 16:00 +0100
            Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-07 16:40 +0100
              Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-07 17:50 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-07 22:00 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-07 22:50 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-08 00:10 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-08 03:40 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-08 19:10 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-08 22:50 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Clemens Gruber <clemens.gruber@pqgruber.com> - 2017-01-11 01:40 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-11 13:00 +0100
                Re: imx: RS-485 problems during TX, maybe DMA related Fabio Estevam <festevam@gmail.com> - 2017-01-08 16:20 +0100

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