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

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Date:	Thu, 16 Aug 2012 19:13:58 +0900 (JST)
From:	Hideki EIRAKU <hdk@...l.co.jp>
To:	m.szyprowski@...sung.com
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,
	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,

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.

I will also remove the Laurent's patch I sent because it was related
to ARCH_HAS_DMA_MMAP_COHERENT.

The remaining patch is sh_mobile_lcdc.  I will remove ifdefs from the
patch and re-post it as a patch v4.

-- 
Hideki EIRAKU <hdk@...l.co.jp>
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