[PATCH v11 0/2] Add support for the Allwinner A31 DMA Controller

Maxime Ripard
2014-07-25T16:37:46Z

Hi Vinod,

On Fri, Jul 25, 2014 at 06:42:17PM +0530, Vinod Koul wrote:
> On Thu, Jul 17, 2014 at 09:46:14PM +0200, Maxime Ripard wrote:
> > Hi,
> >
> > This patchset adds support for the DMA controller found in the
> > Allwinner A31 and A23 SoCs.
> >
> > This has been tested using the newly introduced SPI driver on an A31
> > EVK. Support for DMA-driven SPI transfers will be the subject of
> > another patch serie.
> >
> > This has been around for around 5 monthes now, and didn't get any
> > review but nitpicks for three versions, so I feel like it could be
> > merged quite quickly.
> I have applied this now.

Thanks.

> Can you please send follow patches for these:
> - don't recall if I pointed earlier, but can we use direct conversion for
> calculating convert_burst() and convert_buswidth(), latter one at least
> seem doable

Ok. Do you still want the error reporting for the invalid width and
burst size?

> - don't use devm_request_irq(). You have irq enabled and you have killed
> tasklet. This is too racy. You need to ensure no irqs can be generated before killing
> tasklets.

Ok, would calling disable_irq before killing the tasklet an option for
you ? that would allow to keep the devm_request_irq.

> - use synchronize_irq() before killing tasklet

Actually, I already do it, like you suggested previously. See
sun6i_kill_tasklet.

I'll also send patches for the various breakages and warnings spotted
by the autobuilders.

Thanks!
Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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