On 23 October 2017 at 17:54, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: > This patch adds Exynos IPP v2 subsystem and userspace API. > > New userspace API is focused ONLY on memory-to-memory image processing. > The two remainging IPP operation modes (framebuffer writeback and > local-path output with image processing) can be implemented using > standard DRM features: writeback connectors and additional DRM planes with > scaling features. > > V2 IPP userspace API is not compatible with old IPP ioctls. This is a > significant change, but the old IPP subsystem in mainline Linux kernel was > partially disfunctional anyway and not used in any open-source project. > > V2 IPP userspace API is based on stateless approach, which much better fits > to memory-to-memory image processing model. It also provides support for > all image formats, which are both already defined in DRM API and supported > by the existing IPP hardware modules. > > The API consists of the following ioctls: > - DRM_IOCTL_EXYNOS_IPP_GET_RESOURCES: to enumerate all available image > processing modules, > - DRM_IOCTL_EXYNOS_IPP_GET_CAPS: to query capabilities and supported image > formats of given IPP module, > - DRM_IOCTL_EXYNOS_IPP_GET_LIMITS: to query hardware limitiations for > selected image format of given IPP module, > - DRM_IOCTL_EXYNOS_IPP_COMMIT: to perform operation described by the > provided structures (source and destination buffers, operation rectangle, > transformation, etc). > > The proposed userspace API is extensible. In the future more advanced image > processing operations can be defined to support for example blending. > > Userspace API is fully functional also on DRM render nodes, so it is not > limited to the root/privileged client. > > Internal driver API also has been completely rewritten. New IPP core > performs all possible input validation, checks and object life-time > control. The drivers can focus only on writing configuration to hardware > registers. Stateless nature of DRM_IOCTL_EXYNOS_IPP_COMMIT ioctl simplifies > the driver API. Minimal driver needs to provide a single callback for > starting processing and an array with supported image formats. Is there userspace user for this? This is pretty significant driver-specific API addition. The commit should contain pointers to a userspace project using this, or patches to one. Dave. -- 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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