From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Matt Porter <mporter@ti.com>,
Vinod Koul <vinod.koul@linux.intel.com>,
Jon Hunter <jon-hunter@ti.com>,
device-tree <devicetree-discuss@lists.ozlabs.org>,
linux-omap <linux-omap@vger.kernel.org>,
linux-arm <linux-arm-kernel@lists.infradead.org>,
Stephen Warren <swarren@nvidia.com>,
Benoit Cousson <b-cousson@ti.com>,
Nicolas Ferre <nicolas.ferre@atmel.com>,
Rob Herring <rob.herring@calxeda.com>,
Grant Likely <grant.likely@secretlab.ca>,
Dan Williams <djbw@fb.com>
Subject: Re: [PATCH V6 2/2] dmaengine: add helper function to request a slave DMA channel
Date: Tue, 18 Sep 2012 19:10:39 +0100 [thread overview]
Message-ID: <20120918181039.GF12445@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <201209181520.08845.arnd@arndb.de>
On Tue, Sep 18, 2012 at 03:20:08PM +0000, Arnd Bergmann wrote:
> On Tuesday 18 September 2012, Matt Porter wrote:
> > FWIW, I'm already basing the EDMA dmaengine support for OMAP (specifically
> > for AM335x) on using these helpers since AM335x only boots from DT.
>
> I suspect the same thing will be happening for a lot of platforms
> after 3.7-rc1: ux500, lpc32xx, integrator, imx, mxs and probably
> others are all waiting for this so they can complete the move
> to DT-only booting.
Integrator won't be, because no integrator platforms have DMA support.
That only came in with the Versatile range, of which it's extremely
dodgy and unreliable to use. So in general, ARMs platforms do not have
working DMA support.
(I actually carry a private patch set which does enable full support on
Versatile platforms, but given the general brokenness of the platform I
see no reason to merge it and cause people issues with the platform when
they find out that DMA is broken in weird and wonderful ways depending
on the FPGA build they've happened to end up with...)
next prev parent reply other threads:[~2012-09-18 18:10 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 22:41 [PATCH V6 0/2] of: Add generic device tree DMA helpers Jon Hunter
2012-09-14 22:41 ` [PATCH V6 1/2] " Jon Hunter
2012-09-14 22:46 ` Stephen Warren
2012-09-15 0:14 ` Russell King - ARM Linux
[not found] ` <20120915001431.GB12445-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-09-17 20:42 ` Arnd Bergmann
[not found] ` <201209172042.11860.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-17 23:06 ` David Brown
[not found] ` <20120917230615.GA26502-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2012-09-18 12:50 ` Arnd Bergmann
2012-09-18 22:19 ` Mitch Bradley
[not found] ` <5058F35A.8040702-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-09-18 22:32 ` Russell King - ARM Linux
2012-09-19 11:09 ` Arnd Bergmann
[not found] ` <201209191109.16529.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-19 14:40 ` Mitch Bradley
2012-09-19 13:52 ` Matt Porter
2012-09-19 14:07 ` Matt Porter
2012-09-19 14:24 ` Arnd Bergmann
2012-09-19 14:36 ` Rob Herring
2012-09-19 14:40 ` Matt Porter
2012-09-19 14:50 ` Arnd Bergmann
2012-09-19 21:25 ` Mitch Bradley
2012-09-19 14:10 ` Rob Herring
[not found] ` <1347662517-4210-1-git-send-email-jon-hunter-l0cyMroinI0@public.gmane.org>
2012-09-14 22:41 ` [PATCH V6 2/2] dmaengine: add helper function to request a slave DMA channel Jon Hunter
2012-09-17 3:33 ` Vinod Koul
2012-09-17 11:59 ` Arnd Bergmann
2012-09-17 22:36 ` Russell King - ARM Linux
2012-09-18 3:13 ` Vinod Koul
2012-09-18 13:21 ` Matt Porter
2012-09-18 15:20 ` Arnd Bergmann
2012-09-18 18:10 ` Russell King - ARM Linux [this message]
2012-09-24 22:25 ` Jon Hunter
2012-09-25 4:35 ` Vinod Koul
2012-10-16 2:43 ` Shawn Guo
2012-10-16 2:39 ` Vinod Koul
2012-11-09 20:01 ` Jon Hunter
2012-11-16 1:37 ` Vinod Koul
2012-11-16 8:39 ` Nicolas Ferre
2012-11-16 15:45 ` Jon Hunter
2012-11-28 17:06 ` Vinod Koul
2012-12-19 17:12 ` Jon Hunter
2012-12-20 14:57 ` Vinod Koul
2012-09-18 3:00 ` Vinod Koul
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