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Use right buffer flag NVMAP_HANDLE_WRITE_COMBINE to allocate buffer,
which can be shared by VI/CSI and CPU. Don't use NVMAP_HEAP_SYSMEM.
It is validated to old T20 silicon and can't support big buffers. By
default, our nvmap_alloc() will use IOVMM to allocate buffers.
nvmap_pin() gives us IOVA for hardware engines like VI/CSI module
with IOMMU enabled in kernel. nvmap_mmap() gives us VA for CPU
read/write operations. So we need to convert VA address to physical
address of the buffer and map that buffer to user space processor's
memory space "page by page".
Change-Id: I543d9d95fc14395200647e09480f25d9bc001e00
Signed-off-by: Bryan Wu <pengw@nvidia.com>
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This reverts commit 080c3135b58aa700851991fb672e6c33cf16d9d9.
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This is based off of videobuf2-dma-contig, except we use Tegra's
nvmap for the buffer allocations.
Signed-off-by: Andrew Chew <achew@nvidia.com>
Change-Id: I15e689c33ee7b4fc0aade794c78701c82483df3f
Reviewed-on: http://git-master/r/145345
(cherry picked from commit 70a4f20fbdd6c2c719400d6c59ef58d845657031)
Signed-off-by: Bryan Wu <pengw@nvidia.com>
Change-Id: Ia0632d7fcb28415e33fbb22c48f29117d7436f1d
Reviewed-on: http://git-master/r/170824
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Andrew Chew <achew@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Winnie Hsu <whsu@nvidia.com>
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