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Samsung Exynos DRM Prepares For New Kernel
First of all, with the Linux 3.8 kernel when using the Samsung Exynos DRM driver, the DMA-BUF attach/detach feature is supported. As already reported on, Linux 3.8 will support DMA-BUF buffer sharing for V4L2 drivers and so the Samsung Exynos SoCs will be able to share buffers between the DRM graphics driver and their Video 4 Linux 2 component without needing to copy the memory. The attach/detach feature now supported is to resolve a performance issue when the V4L2 driver is using an imported GEM buffer.
The other major addition to this open-source ARM kernel graphics driver is landing the IPP subsystem framework. The Exynos IPP subsystem is for Image Post Processing and supports image scalar/rotator/crop/flip/color-space and input/output operations.
Another highlight is run-time power management support for the HDMI driver. Other changes include supporting the DMA attribute for no kernel mapping, moving around DRM device and HDMI device registration, and various fixes and clean-ups.
These changes were discussed this morning on dri-devel. Expect the official Linux 3.8 DRM pull request to happen in the coming days.