[PATCH v8 0/5] media: imx: Add Rec.709 and limited range encoding support

[Steve Longerbeam <slongerbeam@gmail.com>]

This patchset adds support for Rec.709 encoding and inverse encoding,
and encoding between both full-range and limited-range quantization
for both YUV and RGB, to ipu-ic. The imx-media driver can now support
both BT.601 and Rec.709 encoding, and limited and full-range quantization.

History:
v8:
- removed the Fixes: and cc: stable in patch "Fully describe colorspace
  conversions". This patch is too difficult to backport to stable trees.
  No functional changes in this version.

v7:
- removed the run-time transformation of coefficients from full-range
  to limited-range, and instead hard-code all the coefficient tables.
- moved the coefficient tables into a new module ipu-ic-csc.c.
- introduced ipu_ic_calc_csc() which pre-determines coefficients,
  which are then passed to ipu_ic_task_init(_rsc)() as a filled
  'struct ipu_ic_csc'.
- added support for limited-range RGB.

v6:
- tweak some of the coefficients slightly, they were not getting
  rounded correctly.
- move the introduction of calc_csc_coeffs() to an earlier patch for
  easier patch readability.

v5:
- the hard-coded encode coefficients now convert only between
  full-range quantization. A new function is added to transform the
  coefficients to limited-range at input or output.
- add a bug fix patch for saturation bit in TPMEM register.
- add a patch to fully describe input and output colorspace to
  the IC task init functions.
- add imx_media_try_colorimetry(), called at all sink/source pad try_fmt.

v4:
- fix a compile error in init_csc(), reported by Tim Harvey.

v3:
- fix some inconsistent From: and Signed-off-by:'s.
  No functional changes.

v2:
- rename ic_csc_rgb2rgb matrix to ic_csc_identity.
- only return "Unsupported YCbCr encoding" error if inf != outf,
  since if inf == outf, the identity matrix can be used. Reported
  by Tim Harvey.
- move ic_route check above default colorimetry checks, and fill default
  colorspace for ic_route, otherwise it's not possible to set BT.709
  encoding for ic routes.


Steve Longerbeam (5):
  gpu: ipu-v3: ipu-ic: Fix saturation bit offset in TPMEM
  gpu: ipu-v3: ipu-ic: Fully describe colorspace conversions
  gpu: ipu-v3: ipu-ic-csc: Add support for limited range encoding
  gpu: ipu-v3: ipu-ic-csc: Add support for Rec.709 encoding
  media: imx: Try colorimetry at both sink and source pads

 drivers/gpu/ipu-v3/Makefile                 |   4 +-
 drivers/gpu/ipu-v3/ipu-ic-csc.c             | 410 ++++++++++++++++++++
 drivers/gpu/ipu-v3/ipu-ic.c                 | 138 +++----
 drivers/gpu/ipu-v3/ipu-image-convert.c      |  28 +-
 drivers/staging/media/imx/imx-ic-prp.c      |   6 +-
 drivers/staging/media/imx/imx-ic-prpencvf.c |  42 +-
 drivers/staging/media/imx/imx-media-csi.c   |  19 +-
 drivers/staging/media/imx/imx-media-utils.c |  73 ++--
 drivers/staging/media/imx/imx-media-vdic.c  |   5 +-
 drivers/staging/media/imx/imx-media.h       |   5 +-
 drivers/staging/media/imx/imx7-media-csi.c  |   8 +-
 include/video/imx-ipu-v3.h                  |  56 ++-
 12 files changed, 614 insertions(+), 180 deletions(-)
 create mode 100644 drivers/gpu/ipu-v3/ipu-ic-csc.c

-- 
2.17.1