Eric Lee / smarc-fsl-linux-kernel

23 Dec, 2011

1 commit

  • f3bc9d24c   drm/omap: GEM, deal with cache ... Browse Code »

    Uncached/writecombine buffers need to be clean before creating uc/wc
    userspace mappings, lest dirty cache lines fall down and corrupt the
    contents of the buffer.

    Signed-off-by: Rob Clark
    Signed-off-by: Greg Kroah-Hartman

    Rob Clark
     

17 Dec, 2011

3 commits

13 Dec, 2011

3 commits

09 Dec, 2011

2 commits

  • f7f9f4536   drm/omap: add GEM support for tiled/dmm buffers ... Browse Code »

    TILER/DMM provides two features for omapdrm GEM objects:
    1) providing a physically contiguous view to discontiguous memory
    for hw initiators that cannot otherwise support discontiguous
    buffers (DSS scanout, IVAHD video decode/encode, etc)
    2) providing untiling for 2d tiled buffers, which are used in some
    cases to provide rotation and reduce memory bandwidth for hw
    initiators that tend to access data in 2d block patterns.

    For 2d tiled buffers, there are some additional complications when
    it comes to userspace mmap'ings. For non-tiled buffers, the original
    (potentially physically discontiguous) pages are used to back the
    mmap. For tiled buffers, we need to mmap via the tiler/dmm region to
    provide an unswizzled view of the buffer. But (a) the buffer is not
    necessarily pinned in TILER all the time (it can be unmapped when
    there is no DMA access to the buffer), and (b) when they are they
    are pinned, they not necessarily page aligned from the perspective of
    the CPU. And non-page aligned userspace buffer mapping is evil.

    To solve this, we reserve one or more small regions in each of the 2d
    containers when the driver is loaded to use as a "user-GART" where we
    can create a second page-aligned mapping of parts of the buffer being
    accessed from userspace. Page faulting is used to evict and remap
    different regions of whichever buffers are being accessed from user-
    space.

    Signed-off-by: Rob Clark
    Signed-off-by: Greg Kroah-Hartman

    Rob Clark
     
  • 71e8831f6   drm/omap: DMM/TILER support for OMAP4+ platform ... Browse Code »

    Dynamic Memory Manager (DMM) is a hardware block in the OMAP4+
    processor that contains at least one TILER instance. TILER, or
    Tiling and Isometric Lightweight Engine for Rotation, provides
    IOMMU capabilities through the use of a physical address translation
    table. The TILER also provides zero cost rotation and mirroring.

    The TILER provides both 1D and 2D access by providing different views
    or address ranges that can be used to access the physical memory that
    has been mapped in through the PAT. Access to the 1D view results in
    linear access to the underlying memory. Access to the 2D views result
    in tiled access to the underlying memory resulted in increased
    efficiency.

    The TILER address space is managed by a tiler container manager (TCM)
    and allocates the address space through the use of the Simple Tiler
    Allocation algorithm (SiTA). The purpose of the algorithm is to keep
    fragmentation of the address space as low as possible.

    Signed-off-by: Andy Gross
    Signed-off-by: Rob Clark
    Signed-off-by: Greg Kroah-Hartman

    Andy Gross
     

27 Nov, 2011

1 commit

  • cd5351f4d   staging: add omapdrm DRM/KMS driver for TI OMAP platforms ... Browse Code »

    A DRM display driver for TI OMAP platform. Similar to omapfb (fbdev)
    and omap_vout (v4l2 display) drivers in the past, this driver uses the
    DSS2 driver to access the display hardware, including support for
    HDMI, DVI, and various types of LCD panels. And it implements GEM
    support for buffer allocation (for KMS as well as offscreen buffers
    used by the xf86-video-omap userspace xorg driver).

    The driver maps CRTCs to overlays, encoders to overlay-managers, and
    connectors to dssdev's. Note that this arrangement might change slightly
    when support for drm_plane overlays is added.

    For GEM support, non-scanout buffers are using the shmem backed pages
    provided by GEM core (In drm_gem_object_init()). In the case of scanout
    buffers, which need to be physically contiguous, those are allocated
    with CMA and use drm_gem_private_object_init().

    See userspace xorg driver:
    git://github.com/robclark/xf86-video-omap.git

    Refer to this link for CMA (Continuous Memory Allocator):
    http://lkml.org/lkml/2011/8/19/302

    Links to previous versions of the patch:
    v1: http://lwn.net/Articles/458137/
    v2: http://patches.linaro.org/4156/
    v3: http://patches.linaro.org/4688/
    v4: http://patches.linaro.org/4791/

    History:

    v5: move headers from include/drm at Greg KH's request, minor rebasing
    on 3.2-rc1, pull in private copies of drm_gem_{get,put}_pages()
    because "drm/gem: add functions to get/put pages" patch is not
    merged yet
    v4: bit of rework of encoder/connector _dpms() code, modeset_init()
    rework to not use nested functions, update TODO.txt
    v3: minor cleanups, improved error handling for dev_load(), some minor
    API changes that will be needed later for tiled buffer support
    v2: replace omap_vram with CMA for scanout buffer allocation, remove
    unneeded functions, use dma_addr_t for physical addresses, error
    handling cleanup, refactor attach/detach pages into common drm
    functions, split non-userspace-facing API into omap_priv.h, remove
    plugin API

    v1: original

    Signed-off-by: Rob Clark
    Acked-by: Daniel Vetter
    Signed-off-by: Greg Kroah-Hartman

    Rob Clark