This patch series add a v4l2 m2m drvier for rockchip RGA direct rendering based 2d graphics acceleration module. Before, my colleague yakir have write a drm RGA drvier and send it to the lists. http://lists.infradead.org/pipermail/linux-arm-kernel/2016-March/416769.html I have been asked to find a userspace user("compositor") for it, but after some studys, my conclusion is that unlike exynos g2d, rockchip rga are not suitable for compositor. Rockchip RGA have a limited MMU, which means it can only hold several buffers in the same time. When it was used in compositor, it will waste a lot of time to import/export/flush buffer, resulting in a bad performance. A few months ago, i saw a discussion in dri-devel@xxxxxxxxxxxxxxxxxxxxx. It remind that we could write a v4l2 m2m RGA driver, since we usually use RGA for streaming purpose. https://patches.linaro.org/cover/97727/ I have test this driver with gstreamer v4l2transform plugin and it seems work well. change in V4: - document the controls. - change according to Hans's comments change in V3: - rename the controls. - add pm_runtime support. - enable node by default. - correct spelling in documents. change in V2: - generalize the controls. - map buffers (10-50 us) in every cmd-run rather than in buffer-import to avoid get_free_pages failed on actively used systems. - remove status in dt-bindings examples. Jacob Chen (6): [media] v4l: add portduff blend modes [media] extended-controls.rst: add PorterDuff mode control [media]: rockchip/rga: v4l2 m2m support ARM: dts: rockchip: add RGA device node for RK3288 ARM: dts: rockchip: add RGA device node for RK3399 dt-bindings: Document the Rockchip RGA bindings .../devicetree/bindings/media/rockchip-rga.txt | 33 + Documentation/media/uapi/v4l/extended-controls.rst | 4 + arch/arm/boot/dts/rk3288.dtsi | 11 + arch/arm64/boot/dts/rockchip/rk3399.dtsi | 11 + drivers/media/platform/Kconfig | 11 + drivers/media/platform/Makefile | 2 + drivers/media/platform/rockchip-rga/Makefile | 3 + drivers/media/platform/rockchip-rga/rga-buf.c | 153 ++++ drivers/media/platform/rockchip-rga/rga-hw.c | 650 ++++++++++++++ drivers/media/platform/rockchip-rga/rga-hw.h | 437 +++++++++ drivers/media/platform/rockchip-rga/rga.c | 975 +++++++++++++++++++++ drivers/media/platform/rockchip-rga/rga.h | 109 +++ drivers/media/v4l2-core/v4l2-ctrls.c | 20 +- include/uapi/linux/v4l2-controls.h | 20 +- 14 files changed, 2437 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/media/rockchip-rga.txt create mode 100644 drivers/media/platform/rockchip-rga/Makefile create mode 100644 drivers/media/platform/rockchip-rga/rga-buf.c create mode 100644 drivers/media/platform/rockchip-rga/rga-hw.c create mode 100644 drivers/media/platform/rockchip-rga/rga-hw.h create mode 100644 drivers/media/platform/rockchip-rga/rga.c create mode 100644 drivers/media/platform/rockchip-rga/rga.h -- 2.7.4
