Re: [PATCH 00/15] Exynos MFC v6+ - remove the need for the reserved memory

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Hello Marek,

On 02/14/2017 04:51 AM, Marek Szyprowski wrote:
> Dear All,
> 
> This patchset is a result of my work on enabling full support for MFC device
> (multimedia codec) on Exynos 5433 on ARM64 architecture. Initially I thought
> that to let it working on ARM64 architecture with IOMMU, I would need to
> solve the issue related to the fact that s5p-mfc driver was depending on the
> first-fit allocation method in the DMA-mapping / IOMMU glue code (ARM64 use
> different algorithm). It turned out, that there is a much simpler way.
> 

A nice side effect of these patches is that I don't see anymore a page fault
error with CMA when sharing dma-buf between s5p-fmc and exynos-gsc drivers.

Following GST pipeline used to lead to a system crash, but it's working now:

$ gst-launch-1.0 filesrc location=test.mp4 ! qtdemux ! h264parse ! \
v4l2video2dec capture-io-mode=dmabuf ! v4l2video0convert \
output-io-mode=dmabuf-import capture-io-mode=dmabuf ! kmssink

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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