linux-kernel - Re: [PATCH] serial: imx: disable DMA for RS-485 on i.MX6 SMP

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Message-ID: <CAOMZO5DXxaJ6PveJb9912rog8xvfqgsg3O3u3a-ffWUj9ZnpCg@mail.gmail.com>
Date:   Wed, 21 Jun 2017 11:12:23 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Clemens Gruber <clemens.gruber@...ruber.com>
Cc:     "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Fugang Duan <fugang.duan@....com>
Subject: Re: [PATCH] serial: imx: disable DMA for RS-485 on i.MX6 SMP

Hi Clemens,

On Wed, Jun 21, 2017 at 11:05 AM, Clemens Gruber
<clemens.gruber@...ruber.com> wrote:
>
> I'd also prefer fixing the underlying problem.

Yes, that would be much better.

> If you take a look at the DMA parts in drivers/tty/serial/imx.c, can you
> spot anything SMP-unsafe?

Not really.

> By the way, can you get your hands on an i.MX6Q board with RS-485 to
> reproduce it?

Unfortunately I don't have such hardware. Even the mx6solo board that
I used to have access in the past I do not have it anymore.

> We could try for a few more weeks to find the bug and if we don't find
> it, adding this rs485-enabled-at-boot-time property sounds good!

Sounds like a good plan, thanks.