linux-kernel - Re: [PATCH v11 0/2] Add support for the Allwinner A31 DMA Controller

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Date:	Fri, 25 Jul 2014 11:41:30 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...glegroups.com, kevin.z.m.zh@...il.com,
	sunny@...winnertech.com, shuge@...winnertech.com,
	zhuzhenhua@...winnertech.com, Arnd Bergmann <arnd@...db.de>,
	andriy.shevchenko@...el.com, dmaengine@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v11 0/2] Add support for the Allwinner A31 DMA
 Controller

On Thu, Jul 24, 2014 at 04:44:20PM -0700, Andrew Morton wrote:
> On Thu, 24 Jul 2014 14:13:15 +0200 Maxime Ripard <maxime.ripard@...e-electrons.com> 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.
> > 
> > Ok, so, who should I bribe to get this merged?
> 
> Turns out I'm easily bribed.  The code looks pretty clean and simple
> and is refreshingly free of comments, which only confuse people anyway.
Sorry for the delay, I will get this done today and merge to slave-dmaengine
next

> I think we could do this as a single patch - is there any benefit to
> splitting it apart like this?
Typically DT bindings are sent as aseprate patch and review independent of
teh driver. Though not many from DT-list have looked up slowing down patches

> The combinations of spin_lock()/spin_lock_irq() and spin_lock_irqsave()
> are a bit scary - it's easy to get these optimisations wrong.  Has it
> been thoroughly tested with lockdep enabled?
Since the dma is handled in the irq, iut is actaully essential to have
irqsave versions for dmaenegine driver

Thanks
-- 
~Vinod
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