Add V4L stateless video decoder API support to NVIDIA Tegra driver

Support V4L stateless video decoder API by NVIDIA Tegra decoder driver. Tested using GStreamer [1] and libvdpau-tegra [2][8].

[1] https://github.com/grate-driver/gstreamer/commit/b8509bdbb69b534e61419ea1798f32f9ad2f3597
[2] https://github.com/grate-driver/libvdpau-tegra/commit/f822e95911e5e0c39f8ba19f843ddc1e0138d5ce
[8] https://github.com/grate-driver/libvdpau-tegra/commit/80db4d02369f2a984ce3173d6bc305f32e9fdb97

Changelog:

v5: - Corrected drivers/staging/media/Makefile, where I removed the VI
driver instead of VDE. This was reported by the 0-DAY build bot.

v4: - Added r-b from Nicolas Dufresne to the
"V4L2_H264_DECODE_PARAM_FLAG_P/BFRAME flags" patch.

- Added patches to de-stage driver, like was suggested by Hans Verkuil.

- Added patch to enable driver in ARM's multi-platform defconfig.

v3: - Added new decode_params flags [7] instead of V4L2_BUF_FLAG_*FRAME flags,
as was suggested by Nicolas Dufresne.

[7] https://github.com/grate-driver/gstreamer/commit/c5cd847f9c26b7669720ae58f9058de2515f51a2

- Added new patch that removes legacy UAPI.

v2: - Made V4L2_BUF_FLAG_*FRAME flags mandatory [3] and dropped reading
of raw bitstream from the driver code, as was suggested by Nicolas Dufresne.

[3] https://github.com/grate-driver/gstreamer/commit/aee292f0f2e84b7654a314dd7e63f916888ffaa5

- Ran v4l2-compliance [4] and fluster [5][6] tests, like was suggested by Nicolas Dufresne. Fixed minor v4l2-compliance errors that were related to a partial initialization of the coded format and were harmless in practice, but made compliance checker unhappy.

[4] https://gist.github.com/digetx/5d6bcdab633488f1dcc7c141ab90d30e
[5] https://gist.github.com/digetx/b06c5d779e9d25afa41d9f46946fe399
[6] https://gist.github.com/digetx/ac4198bc340e5065aa8ec3288bb21356

Dmitry Osipenko (8):
media: v4l2-ctrls: Add new V4L2_H264_DECODE_PARAM_FLAG_P/BFRAME flags
media: staging: tegra-vde: Factor out H.264 code
media: staging: tegra-vde: Support V4L stateless video decoder API
media: staging: tegra-vde: Remove legacy UAPI support
media: staging: tegra-vde: Bump BSEV DMA timeout
media: staging: tegra-vde: De-stage driver
ARM: tegra_defconfig: Update CONFIG_TEGRA_VDE option
ARM: config: multi v7: Enable NVIDIA Tegra video decoder driver

 .../media/v4l/ext-ctrls-codec-stateless.rst   |    6 +
 MAINTAINERS                                   |    2 +-
 arch/arm/configs/multi_v7_defconfig           |    1 +
 arch/arm/configs/tegra_defconfig              |    3 +-
 drivers/media/platform/Kconfig                |   17 +
 drivers/media/platform/Makefile               |    2 +
 drivers/media/platform/tegra/vde/Makefile     |    3 +
 .../platform/tegra/vde}/dmabuf-cache.c        |    2 +-
 drivers/media/platform/tegra/vde/h264.c       |  946 ++++++++++++
 .../platform/tegra/vde}/iommu.c               |    2 +-
 .../platform/tegra/vde}/trace.h               |    2 +-
 drivers/media/platform/tegra/vde/v4l2.c       | 1018 ++++++++++++
 drivers/media/platform/tegra/vde/vde.c        |  551 +++++++
 drivers/media/platform/tegra/vde/vde.h        |  242 +++
 drivers/staging/media/Kconfig                 |    2 -
 drivers/staging/media/Makefile                |    1 -
 drivers/staging/media/tegra-vde/Kconfig       |   10 -
 drivers/staging/media/tegra-vde/Makefile      |    3 -
 drivers/staging/media/tegra-vde/TODO          |    4 -
 drivers/staging/media/tegra-vde/uapi.h        |   73 -
 drivers/staging/media/tegra-vde/vde.c         | 1358 -----------------
 drivers/staging/media/tegra-vde/vde.h         |  125 --
 include/uapi/linux/v4l2-controls.h            |    2 +
 23 files changed, 2794 insertions(+), 1581 deletions(-)
 create mode 100644 drivers/media/platform/tegra/vde/Makefile
 rename drivers/{staging/media/tegra-vde => media/platform/tegra/vde}/dmabuf-cache.c (99%)
 create mode 100644 drivers/media/platform/tegra/vde/h264.c
 rename drivers/{staging/media/tegra-vde => media/platform/tegra/vde}/iommu.c (98%)
 rename drivers/{staging/media/tegra-vde => media/platform/tegra/vde}/trace.h (97%)
 create mode 100644 drivers/media/platform/tegra/vde/v4l2.c
 create mode 100644 drivers/media/platform/tegra/vde/vde.c
 create mode 100644 drivers/media/platform/tegra/vde/vde.h
 delete mode 100644 drivers/staging/media/tegra-vde/Kconfig
 delete mode 100644 drivers/staging/media/tegra-vde/Makefile
 delete mode 100644 drivers/staging/media/tegra-vde/TODO
 delete mode 100644 drivers/staging/media/tegra-vde/uapi.h
 delete mode 100644 drivers/staging/media/tegra-vde/vde.c
 delete mode 100644 drivers/staging/media/tegra-vde/vde.h

2.34.1