Re: [RFC 4/4] drm: Add NVIDIA Tegra support |
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- Subject: Re: [RFC 4/4] drm: Add NVIDIA Tegra support
- From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
- Date: Wed, 11 Apr 2012 15:52:37 +0100
- Cc: Daniel Vetter <daniel@xxxxxxxx>, Stephen Warren <swarren@xxxxxxxxxxxxx>, Joerg Roedel <joerg.roedel@xxxxxxx>, devicetree-discuss@xxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, Jon Mayo <jmayo@xxxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Colin Cross <ccross@xxxxxxxxxxx>, linux-tegra@xxxxxxxxxxxxxxx, Hiroshi Doyu <hdoyu@xxxxxxxxxx>
- In-reply-to: <20120411141108.GI27337@avionic-0098.adnet.avionic-design.de>
> Maybe your question is answered by my reply to Alan's comment. The mapping
> is actually done to get a linear view for the display controller which
> doesn't support SG transfers. The kernel and user-space already have virtual
> linear buffers.
The framebuffer currently needs a physically contiguous map for the
console devices. Well you could vmap them but that is pretty hideous on a
32bit platform with 32bit 1080p display plugged into it!
Alan
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