[PATCH 2/8] drm/tegra: Allocate BOs from lower 4G when without IOMMU

[Thierry Reding]

On Thu, Nov 10, 2016 at 08:23:39PM +0200, Mikko Perttunen wrote:
> On 64-bit Tegras, buffer object memory allocation may
> return memory above 4G that units behind Host1x cannot
> access. Add the GFP_DMA flag to these allocation when
> IOMMU is not enabled to ensure units can always access
> BO memory.

I don't think that's entirely true. The display controller can address
more than 32 bits. It's perhaps slightly different from other units that
are behind host1x, but maybe we need a special case here to allow frame-
buffers to reside in higher memory?

Thierry
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