From: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
To: video4linux-list@redhat.com
Cc: video4linux-list@redhat.com, linux-sh@vger.kernel.org
Subject: Re: [PATCH 04/06] videobuf: Add physically contiguous queue code V3
Date: Mon, 14 Jul 2008 15:20:34 +0300 [thread overview]
Message-ID: <487B4492.2020301@teltonika.lt> (raw)
In-Reply-To: <20080714120240.4806.15664.sendpatchset@rx1.opensource.se>
Magnus Damm wrote:
> This is V3 of the physically contiguous videobuf queues patch.
> Useful for hardware such as the SuperH Mobile CEU which doesn't
> support scatter gatter bus mastering.
gather
^
>
> Since it may be difficult to allocate large chunks of physically
> contiguous memory after some uptime due to fragmentation, this code
> allocates memory using dma_alloc_coherent(). Architectures supporting
> dma_declare_coherent_memory() can easily avoid fragmentation issues
> by using dma_declare_coherent_memory() to force dma_alloc_coherent()
> to allocate from a certain pre-allocated memory area.
>
> Signed-off-by: Magnus Damm <damm@igel.co.jp>
Tested-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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next prev parent reply other threads:[~2008-07-14 12:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-14 12:02 [PATCH 00/06] soc_camera: SuperH Mobile CEU patches V3 Magnus Damm
2008-07-14 12:02 ` [PATCH 01/06] soc_camera: Move spinlocks Magnus Damm
2008-07-14 12:31 ` Guennadi Liakhovetski
2008-07-14 12:36 ` Paulius Zaleckas
2008-07-14 12:43 ` Guennadi Liakhovetski
2008-07-15 8:23 ` Magnus Damm
2008-07-14 12:02 ` [PATCH 02/06] soc_camera: Add 16-bit bus width support Magnus Damm
2008-07-14 12:02 ` [PATCH 03/06] videobuf: Fix gather spelling Magnus Damm
2008-07-14 12:02 ` [PATCH 04/06] videobuf: Add physically contiguous queue code V3 Magnus Damm
2008-07-14 12:20 ` Paulius Zaleckas [this message]
2008-07-14 12:02 ` [PATCH 05/06] sh_mobile_ceu_camera: Add SuperH Mobile CEU driver V3 Magnus Damm
2008-07-18 7:39 ` Guennadi Liakhovetski
2008-07-18 8:07 ` Magnus Damm
2008-07-18 8:23 ` Guennadi Liakhovetski
[not found] ` <20080718214644.GB21846@linux-sh.org>
2008-07-18 22:14 ` Guennadi Liakhovetski
[not found] ` <20080718222713.GA18822@linux-sh.org>
2008-07-18 22:48 ` Guennadi Liakhovetski
2008-07-14 12:02 ` [PATCH 06/06] soc_camera_platform: Add SoC Camera Platform driver Magnus Damm
2008-07-18 7:40 ` [PATCH 00/06] soc_camera: SuperH Mobile CEU patches V3 Guennadi Liakhovetski
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