linux-kernel - Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

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Message-ID: <20120410172853.GA25697@mwesterb-mobl>
Date:	Tue, 10 Apr 2012 20:28:53 +0300
From:	Mika Westerberg <mika.westerberg@....fi>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	Rafal Prylowski <prylowski@...asoft.pl>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"rmallon@...il.com" <rmallon@...il.com>
Subject: Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

On Fri, Mar 23, 2012 at 11:09:50AM -0500, H Hartley Sweeten wrote:
> On Friday, March 23, 2012 12:05 AM, Mika Westerberg wrote:
> > On Thu, Mar 22, 2012 at 09:19:10PM -0500, H Hartley Sweeten wrote:
> >
> >> Did you test this patch or just review it?
> >
> > I tested and reviewed it.
> 
> OK. What kernel? My tests so far have been with 3.3.
> 
> >> On my system it doesn't work. I think it has something to do with the
> >> changes to m2m_hw_interrupt but I haven't tracked it down yet.
> >> 
> >> It looks like what's missing is a:
> >> 
> >> 	edmac->edma->hw_submit(edmac);
> >> 
> >> But, maybe that's not needed with double buffering?
> >
> > Did you try without your patch and adding my VIC hack? That's what I did when
> > I first got this patch and I saw no problems. I tested with audio (M2P),
> > mmc_spi (M2M) and dmatest (M2M).
> 
> No, I have not applied your VIC hack.
> 
> Until we get a working solution, without any hacks, I don't want this to go in.

Now that the spurious interrupts thing with VIC has been sorted out, should we
revisit this patch? Hartley, do you have any objections merging this?
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