Date: Fri, 25 Jul 2014 11:41:30 +0530
From: Vinod Koul <vinod.koul@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>,
        Dan Williams <dan.j.williams@intel.com>, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-sunxi@googlegroups.com,
        kevin.z.m.zh@gmail.com, sunny@allwinnertech.com,
        shuge@allwinnertech.com, zhuzhenhua@allwinnertech.com,
        Arnd Bergmann <arnd@arndb.de>, andriy.shevchenko@intel.com,
        dmaengine@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v11 0/2] Add support for the Allwinner A31 DMA
 Controller
Message-ID: <20140725061130.GF8181@intel.com>
References: <1405626376-471-1-git-send-email-maxime.ripard@free-electrons.com>
 <20140724121315.GV20328@lukather>
 <20140724164420.d7c58c9b5f6bf3e06137494f@linux-foundation.org>
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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@free-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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