• Marek Szyprowski's avatar
    drm/exynos: ipp: Add IPP v2 framework · 9913f74f
    Marek Szyprowski authored
    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 operation modes of obsolete IPP v1 API (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 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.
    Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
    Tested-by: default avatarHoegeun Kwon <hoegeun.kwon@samsung.com>
    Merge conflict so merged manually.
    Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
    9913f74f
exynos_drm_ipp.h 5.03 KB