Re: [PATCH 0/7] Exynos: MFC driver: reserved memory cleanup and IOMMU support

[Marek Szyprowski <m.szyprowski@samsung.com>]

Hello,

On 2015-12-07 13:08, Marek Szyprowski wrote:
> This patchset finally perform cleanup of custom code in s5p-mfc codec
> driver. The first part is removal of custom, driver specific code for
> intializing and handling of reserved memory. Instead, a generic code for
> reserved memory regions is used. Then, once it is done, the proper setup
> of DMA parameters (max segment size) is applied for all multimedia
> devices found on Exynos SoCs to let them properly handle shared buffers
> mapped into contiguous DMA address space. The last patch adds support
> for IOMMU to MFC driver. Some additional code is needed because of
> specific requirements of MFC device firmware (see patch 7 for more
> details). When no IOMMU is available, the code fallbacks to generic
> reserved memory regions.
>
> After applying this patchset, MFC device works correctly when IOMMU is
> either enabled or disabled.
>
> Patches have been tested on top of linux-next from 20151207. I would
> prefer to merge patches 1-2 via Samsung tree and patches 3-7 via media
> tree (there are no compile-time dependencies between patches 1-2 and
> 3-7). Patches have been tested on Odroid U3 (Exynos 4412 based) and
> Odroid XU3 (Exynos 5422 based) boards.

One more notice: this is an updated version of the old patch initially
posted here:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-August/189259.html

The main change since that is adaptation for generic reserved memory
bindings, which have been merged a while ago and added support for IOMMU.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland