linux-kernel - RE: [PATCH v3 3/4] media: videobuf2-dma-contig: use dma_mmap

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Date:	Thu, 16 Aug 2012 12:39:57 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	'Hideki EIRAKU' <hdk@...l.co.jp>
Cc:	laurent.pinchart@...asonboard.com, linux@....linux.org.uk,
	pawel@...iak.com, kyungmin.park@...sung.com, mchehab@...radead.org,
	FlorianSchandinat@....de, perex@...ex.cz, tiwai@...e.de,
	Tomasz Stanislawski <t.stanislaws@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-fbdev@...r.kernel.org,
	alsa-devel@...a-project.org, matsu@...l.co.jp, dhobsong@...l.co.jp
Subject: RE: [PATCH v3 3/4] media: videobuf2-dma-contig: use dma_mmap_coherent
 if available

Hello,

On Thursday, August 16, 2012 12:14 PM Hideki EIRAKU wrote:

> From: Marek Szyprowski <m.szyprowski@...sung.com>
> Subject: RE: [PATCH v3 3/4] media: videobuf2-dma-contig: use dma_mmap_coherent if available
> Date: Tue, 07 Aug 2012 16:53:25 +0200
> 
> > I'm sorry for bringing this issue now, once you have already created v3 of your
> > patches, but similar patch has been already proposed some time ago. It is already
> > processed together with general videobuf2-dma-contig redesign and dma-buf extensions
> > by Tomasz Stanislawski.
> >
> > See post http://thread.gmane.org/gmane.comp.video.dri.devel/70402/focus=49461 and
> > http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/49438
> >
> > It doesn't use conditional code inside videobuf2 allocator and rely entirely on
> > dma-mapping subsystem to provide a working dma_mmap_coherent/writecombine/attrs()
> > function. When it was posted, it relied on the dma-mapping extensions, which now
> > have been finally merged to v3.6-rc1. Now I wonder if there are any architectures,
> > which don't use dma_map_ops based dma-mapping framework, which might use
> > videobuf2-dma-conting module.
> 
> Thank you for telling me about videobuf2-dma-contig and v3.6-rc1.  The
> videobuf2-dma-contig patch I sent is now unnecessary.  So I will
> remove the patch.  I will remove the patch defining
> ARCH_HAS_DMA_MMAP_COHERENT too because the v3.6-rc1 kernel has generic
> dma_mmap_coherent() API for every architecture.

Just to let you know - Tomasz has posted an updated version of the dma-buf/vb2-dma-contig
patches:

http://www.spinics.net/lists/linux-media/msg51768.html

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center


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