[v3,0/4] RK3288 VP8 decoding support

This patchset adds support for Hantro G1 VP8 stateless decoding,
as available on RK3288 SoC.

In order to support VP8 stateless decoding, a new pixel format
is introduced V4L2_PIX_FMT_VP8_FRAME, to be used with a new control
V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER.

Changes in v3:

* Validate num_dct_parts field, as suggested by Philipp.
  This fixes the kernel oops reported by Philipp.
* Add documentation for num_dct_parts constraint.
* Renamed macroblock_bit_offset to first_part_header_bits
  and fixed its documentation.

Changes in v2:

* Verified that all the fields in the uAPI come from the spec [1].
* Structures and fields have 8-bytes alignment and sizes,
  as suggested by Boris.
* Moved 1-bit fields to a bit in the appropriate flags fields.
* Dropped dequant_factors[4][3][2], I really couldn't find this field
  or anything similar in the spec. It's not mentioned anywhere in
  Chromium or FFMPEG, so I decided to drop it.

[1] https://www.rfc-editor.org/rfc/rfc6386.html

Ezequiel Garcia (2):
  media: v4l2-ctrl: Move compound control validation
  media: v4l2-ctrl: Validate VP8 stateless decoder controls

Pawel Osciak (1):
  media: uapi: Add VP8 stateless decoder API

ZhiChao Yu (1):
  media: hantro: Add support for VP8 decoding on rk3288

 Documentation/media/uapi/v4l/biblio.rst       |  10 +
 .../media/uapi/v4l/ext-ctrls-codec.rst        | 323 +++++++++++
 .../media/uapi/v4l/pixfmt-compressed.rst      |  20 +
 drivers/media/v4l2-core/v4l2-ctrls.c          | 148 +++--
 drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
 drivers/staging/media/hantro/Makefile         |   4 +-
 drivers/staging/media/hantro/hantro.h         |   9 +
 drivers/staging/media/hantro/hantro_drv.c     |   6 +
 .../staging/media/hantro/hantro_g1_vp8_dec.c  | 543 ++++++++++++++++++
 drivers/staging/media/hantro/hantro_hw.h      |  17 +
 drivers/staging/media/hantro/hantro_v4l2.c    |   1 +
 drivers/staging/media/hantro/hantro_vp8.c     | 188 ++++++
 drivers/staging/media/hantro/rk3288_vpu_hw.c  |  22 +-
 include/media/v4l2-ctrls.h                    |   3 +
 include/media/vp8-ctrls.h                     | 110 ++++
 15 files changed, 1346 insertions(+), 59 deletions(-)
 create mode 100644 drivers/staging/media/hantro/hantro_g1_vp8_dec.c
 create mode 100644 drivers/staging/media/hantro/hantro_vp8.c
 create mode 100644 include/media/vp8-ctrls.h