Hi Wolfram,
On Mon, Dec 15, 2014 at 10:06 AM, Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
>> Solutions under consideration:
>> 1. Wolfram posted a patch to make i2c-sh_mobile fall back to PIO,
>> and retry DMA initialization in every request, so it will switch to
>> DMA when it becomes available. But this is suboptimal, as it adds
>> overhead to every request (and DMA may never become available in
>> case 2).
>
> Still, I'd think I should repost my patches with your comments
> addressed. It does add a bit of overhead IF the dmaengine core is
> compiled in AND the driver for the DMA hardware is not. Well, yeah. On
> the other hand, it fixes the regression that the driver is not even
> loaded in that case (because it currently will be deferred endlessly).
>
> What do you think?
I think it doesn't hurt to repost, now more people understand the intrinsics
of the problem.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
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
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