On Tue, Oct 17, 2017 at 01:07:43PM +0200, Marek Szyprowski wrote: > Dear all, > > This patchset performs complete rewrite of Exynos DRM IPP subsystem and > its userspace API. > > Why such rewrite is needed? Exynos DRM IPP API is over-engineered in > general, but not really extensible on the other side. It is also buggy, > with significant design flaws: > - Userspace API covers memory-2-memory picture operations together with > CRTC writeback and duplicating features, which belongs to video plane. > - Lack of support of the all required image formats (for example NV12 > Samsung-tiled cannot be used due to lack of pixel format modifier > support). > - Userspace API designed only to mimic hardware behaviour, not easy to > understand. > - Lack of proper input validation in the core, drivers also didn't do that > correctly, so it was possible to set incorrect parameters and easil > trigger IOMMU fault or memory trash. > - Drivers were partially disfunctional or supported only a subset of modes. > > Due to the above limitations and issues the Exynos DRM IPP API was not > used by any of the open-source projects. I assume that it is safe to remove > this broken API without any damage to open-source community. All remaining > users (mainly Tizen project related) will be updated to the new version. > > This patchset changes Exynos DRM IPP subsystem to something useful. The > userspace API is much simpler, state-less and easy to understand. Also > the code of the core and driver is significantly smaller and easier to > understand. > > Patches were tested on Exynos4412 based Odroid U3, Exynos5422 > Odroid XU3 and Exynos5433 TM2 boards, on top of Linux next-20171016 kernel. When submitting uapi changes, please link to the corresponding userspace work. Otherwise pretty hard to find this stuff. -Daniel > > Best regards > Marek Szyprowski > Samsung R&D Institute Poland > > > Changelog: > > v3: > - fixed minor issues and added features pointed by other developers: > * fixed missing ipp_unregister (Hoegeun) > * added missing limits to FIMC and GSC driver (Hoegeun) > * added more specific compatible strings to GSC driver (Hoegeun) > * added Exynos5433 support to GSC driver (Hoegeun) > * added autosuspend runtime PM to all IPP drivers (Tobias) > - added Exynos5433 support to Scaler driver (thanks to Andrzej) > - dropped Exynos5420 clk patch, which has been alredy merged > > v2: https://www.spinics.net/lists/dri-devel/msg153418.html > - fixed minor issues pointed by other developers: > * fixed possible null pointer dereferrence (Tobias) > * changed limits_size to limits_count (Tobias) > * renamed struct exynos_drm_ipp_format to drm_exynos_ipp_format (Andrzej) > * added proper return value from exynos_drm_ipp_get_res_ioctl when no IPP > driver is present (Andrzej) > * properly aligned all uapi structures to be 32/64 bit safe (Emil) > * properly initialize all strucutres > - added new Exynos Scaler driver from Andrzej Pietrasiewicz > > v1: https://www.spinics.net/lists/linux-samsung-soc/msg60492.html > - initial version of IPP v2 > > My previous works in this area: > > "[RFC v2 0/2] Exynos DRM: add Picture Processor extension" > https://www.spinics.net/lists/dri-devel/msg140669.html > - removed usage of DRM objects and properties - replaced them with simple > list of parameters with predefined IDs > > "[RFC 0/4] Exynos DRM: add Picture Processor extension" > https://www.spinics.net/lists/linux-samsung-soc/msg59323.html > - moved this feature from DRM core to Exynos DRM driver > - changed name from framebuffer processor to picture processor > - simplified code to cover only things needed by Exynos drivers > - implemented simple fifo task scheduler > - cleaned up rotator driver conversion (removed IPP remainings) > > "[RFC 0/2] New feature: Framebuffer processors" > https://www.spinics.net/lists/linux-samsung-soc/msg54810.html > - generic approach implemented in DRM core, rejected > > > Patch summary: > > Andrzej Pietrasiewicz (3): > drm/exynos: Add driver for Exynos Scaler module > ARM: dts: exynos: Add mem-2-mem Scaler devices > ARM64: dts: exynos: Add mem-2-mem Scaler devices > > Marek Szyprowski (6): > drm/exynos: ipp: Remove Exynos DRM IPP subsystem > drm/exynos: ipp: Add IPP v2 framework > drm/exynos: rotator: Convert driver to IPP v2 core API > drm/exynos: gsc: Convert driver to IPP v2 core API > drm/exynos: Add generic support for devices shared with V4L2 subsystem > drm/exynos: fimc: Convert driver to IPP v2 core API > > .../devicetree/bindings/gpu/samsung-scaler.txt | 26 + > arch/arm/boot/dts/exynos5420.dtsi | 35 + > arch/arm64/boot/dts/exynos/exynos5433.dtsi | 42 + > drivers/gpu/drm/exynos/Kconfig | 17 +- > drivers/gpu/drm/exynos/Makefile | 1 + > drivers/gpu/drm/exynos/exynos_drm_drv.c | 36 +- > drivers/gpu/drm/exynos/exynos_drm_drv.h | 5 +- > drivers/gpu/drm/exynos/exynos_drm_fimc.c | 930 +++----- > drivers/gpu/drm/exynos/exynos_drm_fimc.h | 23 - > drivers/gpu/drm/exynos/exynos_drm_gsc.c | 995 +++------ > drivers/gpu/drm/exynos/exynos_drm_gsc.h | 24 - > drivers/gpu/drm/exynos/exynos_drm_ipp.c | 2240 ++++++-------------- > drivers/gpu/drm/exynos/exynos_drm_ipp.h | 357 ++-- > drivers/gpu/drm/exynos/exynos_drm_rotator.c | 740 ++----- > drivers/gpu/drm/exynos/exynos_drm_rotator.h | 19 - > drivers/gpu/drm/exynos/exynos_drm_scaler.c | 717 +++++++ > drivers/gpu/drm/exynos/regs-scaler.h | 426 ++++ > include/uapi/drm/exynos_drm.h | 326 +-- > 18 files changed, 3057 insertions(+), 3902 deletions(-) > create mode 100644 Documentation/devicetree/bindings/gpu/samsung-scaler.txt > delete mode 100644 drivers/gpu/drm/exynos/exynos_drm_fimc.h > delete mode 100644 drivers/gpu/drm/exynos/exynos_drm_gsc.h > delete mode 100644 drivers/gpu/drm/exynos/exynos_drm_rotator.h > create mode 100644 drivers/gpu/drm/exynos/exynos_drm_scaler.c > create mode 100644 drivers/gpu/drm/exynos/regs-scaler.h > > -- > 2.14.2 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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