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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
