linux-kernel - Re: [RFC PATCH 2/4] i2c: add docs to clarify DMA handling

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Message-ID: <CAMuHMdVQmFqC3pZh8BcNROnrdqQ+gx+4Mg40Y1AY=WXE9i83wQ@mail.gmail.com>
Date:   Tue, 6 Jun 2017 13:12:02 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 2/4] i2c: add docs to clarify DMA handling

Hi Wolfram,

On Tue, Jun 6, 2017 at 12:54 PM, Wolfram Sang <wsa@...-dreams.de> wrote:
>> So it won't fall back to PIO if CONFIG_DMA_API_DEBUG is enabled?
>
> No, it will complain loudly with more details about the same things (and
> some more). But for that to do, it cannot fall back to PIO.
>
> Otherwise, you might get the idea that all is fine since you enabled
> CONFIG_DMA_API_DEBUG but miss that most of you transfers fell back to
> PIO. That was my thinking...

Hmm....

I have it enabled all the time. So my devices may stop working...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds