Hello, This is another version of the patchset, which performs cleanup of custom code for reserved memory handling 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, the driver is extended with IOMMU support. The additional code is needed because of specific requirements of MFC device firmware (see patch 3 for more details). When no IOMMU is available, the code fallbacks to use generic reserved memory regions. After applying this patchset, MFC device works correctly either when IOMMU is either enabled or disabled (assuming that board provides required reserved memory regions). Patches have been tested on top of linux-next from 20160524 with some additional patches: - "[PATCH 0/3] [media] s5p-mfc: Fixes for issues when module is removed": https://lkml.org/lkml/2016/5/3/782 - "[PATCH v5 0/2] vb2-dma-contig: configure DMA max segment size properly": https://www.mail-archive.com/linux-media@xxxxxxxxxxxxxxx/msg97625.html I've prepared a git branch with all needed patches: https://git.linaro.org/people/marek.szyprowski/linux-srpol.git v4.6-next20160524-mfc I would prefer to merge patches 1-4 via media tree and patches 5-7 via Samsung SoC tree (there are no compile-time dependencies between those two sets). Patches have been tested on Odroid U3 (Exynos 4412 based) and Odroid XU3 (Exynos 5422 based) boards. Best regards Marek Szyprowski Samsung R&D Institute Poland Changelog: v4: - moved videobuf2-dma-contig/dma max segment size patches to separate thread: https://www.mail-archive.com/linux-media@xxxxxxxxxxxxxxx/msg97625.html - removed 'named' support for reserved memory regions, now regions are selected by index (requested by Rob Herring in v3) - splitted 'ARM: Exynos: convert MFC device to generic reserved memory bindings' patch into 3 separate changes (bindings, dts, code removal), rewrote commit messages to better describe the changes - rebased onto latest linux-next kernel tree v3: http://comments.gmane.org/gmane.linux.drivers.video-input-infrastructure/97316 - fixed issues pointed by Laurent Pinchart: - added documentation to memory-region-names property, - changed devm_kzalloc to kzalloc in vb2_dma_contig_set_max_seg_size() to avoid access to freed memory after reloading driver module - unified odroid mfc reserved memory configuration with other Exynos4 boards v2: http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/97025 - reworked of_reserved_mem_init* functions on request from Rob Herring, added separate index and name based selection of reserved region - adapted for of_reserved_mem_init* related changes v1: https://www.mail-archive.com/linux-media@xxxxxxxxxxxxxxx/msg94100.html - initial version of another approach for this problem, rewrote driver code for new reserved memory bindings, which finally have been merged some time ago v0: http://lists.infradead.org/pipermail/linux-arm-kernel/2013-August/189259.html - old patchset solving the same problem, abandoned due to other tasks and long time of merging reserved memory bindings and support code for it Patch summary: Marek Szyprowski (7): of: reserved_mem: add support for using more than one region for given device media: s5p-mfc: use generic reserved memory bindings media: s5p-mfc: replace custom reserved memory handling code with generic one media: s5p-mfc: add iommu support ARM: Exynos: remove code for MFC custom reserved memory handling ARM: dts: exynos: convert MFC device to generic reserved memory bindings ARM: dts: exynos4412-odroid*: enable MFC device .../devicetree/bindings/media/s5p-mfc.txt | 39 +++-- arch/arm/boot/dts/exynos-mfc-reserved-memory.dtsi | 27 ++++ arch/arm/boot/dts/exynos4210-origen.dts | 4 +- arch/arm/boot/dts/exynos4210-smdkv310.dts | 4 +- arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 6 + arch/arm/boot/dts/exynos4412-origen.dts | 4 +- arch/arm/boot/dts/exynos4412-smdk4412.dts | 4 +- arch/arm/boot/dts/exynos5250-arndale.dts | 4 +- arch/arm/boot/dts/exynos5250-smdk5250.dts | 4 +- arch/arm/boot/dts/exynos5250-spring.dts | 4 +- arch/arm/boot/dts/exynos5420-arndale-octa.dts | 4 +- arch/arm/boot/dts/exynos5420-peach-pit.dts | 4 +- arch/arm/boot/dts/exynos5420-smdk5420.dts | 4 +- arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 4 +- arch/arm/boot/dts/exynos5800-peach-pi.dts | 4 +- arch/arm/mach-exynos/Makefile | 2 - arch/arm/mach-exynos/exynos.c | 19 --- arch/arm/mach-exynos/mfc.h | 16 --- arch/arm/mach-exynos/s5p-dev-mfc.c | 93 ------------ drivers/media/platform/s5p-mfc/s5p_mfc.c | 158 +++++++++++---------- drivers/media/platform/s5p-mfc/s5p_mfc_iommu.h | 79 +++++++++++ drivers/of/of_reserved_mem.c | 85 ++++++++--- include/linux/of_reserved_mem.h | 25 +++- 23 files changed, 338 insertions(+), 259 deletions(-) create mode 100644 arch/arm/boot/dts/exynos-mfc-reserved-memory.dtsi delete mode 100644 arch/arm/mach-exynos/mfc.h delete mode 100644 arch/arm/mach-exynos/s5p-dev-mfc.c create mode 100644 drivers/media/platform/s5p-mfc/s5p_mfc_iommu.h -- 1.9.2 -- 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
