From: marex@denx.de (Marek Vasut)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mxs/dma: Enlarge the CCW descriptor area to 4 pages
Date: Wed, 5 Sep 2012 04:57:54 +0200 [thread overview]
Message-ID: <201209050457.54336.marex@denx.de> (raw)
In-Reply-To: <20120905023919.GQ2362@S2101-09.ap.freescale.net>
Dear Shawn Guo,
> On Wed, Sep 05, 2012 at 03:46:39AM +0200, Marek Vasut wrote:
> > Let me ask about another thing. If there'll eventually be some device
> > that'd need even larger transfer (say ... hundreds of megs) we'd end up
> > with trouble again.
> >
> > One way to fix this is to recycle descriptors that were already used
> > during the transfer, but can we really do it fast enough, so the DMA
> > would do it's job at one end of the descriptor chain and we'd be
> > building the other?
>
> It looks like a solution, but I'm not sure if it works either.
Besides ... if the system is under some heavier load, this might crash too.
Best regards,
Marek Vasut
next prev parent reply other threads:[~2012-09-05 2:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 4:04 [PATCH] mxs/dma: Enlarge the CCW descriptor area to 4 pages Marek Vasut
2012-09-05 1:40 ` Shawn Guo
2012-09-05 1:46 ` Marek Vasut
2012-09-05 2:39 ` Shawn Guo
2012-09-05 2:57 ` Marek Vasut [this message]
2012-09-14 3:06 ` Vinod Koul
2012-09-14 7:57 ` Marek Vasut
2012-09-14 8:30 ` Russell King - ARM Linux
2012-09-14 8:56 ` Vinod Koul
2012-09-14 3:06 ` Vinod Koul
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