[PATCH 9/9] ARM: multi_v7_defconfig: Enable DMA for Renesas serial ports

[Geert Uytterhoeven]

Hi Arnd,

On Tue, Jul 11, 2017 at 10:42 AM, Arnd Bergmann <arnd at arndb.de> wrote:
> On Tue, Jul 11, 2017 at 8:59 AM, Geert Uytterhoeven
> <geert at linux-m68k.org> wrote:
>> On Tue, Jul 11, 2017 at 5:38 AM, Magnus Damm <magnus.damm at gmail.com> wrote:
>>> On Mon, Jul 10, 2017 at 10:28 PM, Geert Uytterhoeven
>>> Since enabling DMA Engine still keeps PIO support around I wonder why
>>> we need this Kconfig at all - other drivers seem to get by without
>>> this kind of thing?
>>> So in my opinion it would also be nice to get rid of SERIAL_SH_SCI_DMA
>>> completely and reducing the number of special per-driver Kconfig
>>> entries.
>>
>> In general, I would agree, and remove the option at the blimp of an eye.
>> However, this driver is shared with H8/300 and SuperH.  While both could use
>> DMA (but it's not supported by Linux yet), I don't know if they are willing to
>> live with the increased static and dynamic memory footprint of SH_SCI DMA
>> support.
>
> One more thing: enabling the DMA support in the console driver generally
> means you cannot use printk in the DMA driver anywhere that may be called
> during printk(). Not sure if that is a concern here.

Not anymore, as all of these prints should have been removed/disabled already.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-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