[PATCH v9 00/16] MediaTek DDP GAMMA - 12-bit LUT support

[AngeloGioacchino Del Regno]

Changes in v9:
 - As per previous conversation with CK Hu, added a commit that
   de-commonizes the gamma setting function that was used in
   both DISP_AAL and DISP_GAMMA, now each of them have their
   own .gamma_set() callback (mtk_disp_gamma_set_common() has
   been removed).
 - Added a change to use bitfield macros in mtk_disp_aal.c
 - Added a change to compress of_device_id entries in mtk_disp_aal.c
 - Tested again on MT6795, MT8173, MT8186, MT8192, MT8195

Changes in v8:
 - Changed lut_size to be a mtk_disp_gamma_set_common() function
   parameter to pass lut size from AAL

Changes in v7:
 - Added check for NULL dev for AAL-gamma case
 - Added get_lut_size callback for AAL-gamma
 - Added comment to clarify SoC 10/12 bits support and old vs new
   register layout as suggested by Alexandre M.

Changes in v6:
 - Fixed smatch warning in patch 11/11, ref.:
   https://lore.kernel.org/all/202306101458.lRXHEE0Z-lkp@intel.com/

Changes in v5:
 - Removed incorrect comment on default LUT size and bits
 - Removed useless check for num_lut_banks
 - Added comment about CMDQ implementation on patch 5
 - Evaluated passing lut size/bits from AAL, idea discarded as
   the implementation would be rather tricky while bringing no
   benefits.

Changes in v4:
 - Fixed assignment typo appeared in v3

Changes in v3:
 - Fixed issues due to variables renaming during cleanup (oops)
 - This is actually the right series, since v2 was taken from the
   wrong kernel tree.... :-)

Changes in v2:
 - Added explicit inclusion of linux/bitfield.h in patch [06/11]

This series adds support for GAMMA IP requiring and/or supporting
a 12-bits LUT using a slightly different register layout and programming
sequence for multiple LUT banks: this IP version is currently found
on a number of SoCs, not only including the Chromebook/IoT oriented
Kompanio 1200/1380 MT8195/MT8195T, but also Smartphone chips such as
the Dimensity 9200 (MT6985) and others.

This series was tested on MT8195, MT8192, MT8173, MT6795:
 * MT6795, MT8192, MT8173: No regression, works fine.
 * MT8195: Color correction is finally working!

AngeloGioacchino Del Regno (15):
  drm/mediatek: gamma: Reduce indentation in mtk_gamma_set_common()
  drm/mediatek: gamma: Support SoC specific LUT size
  drm/mediatek: gamma: Improve and simplify HW LUT calculation
  drm/mediatek: gamma: Enable the Gamma LUT table only after programming
  drm/mediatek: gamma: Use bitfield macros
  drm/mediatek: aal: Use bitfield macros
  drm/mediatek: De-commonize disp_aal/disp_gamma gamma_set functions
  drm/mediatek: gamma: Support specifying number of bits per LUT
    component
  drm/mediatek: gamma: Support multi-bank gamma LUT
  drm/mediatek: gamma: Add support for 12-bit LUT and MT8195
  drm/mediatek: gamma: Make sure relay mode is disabled
  drm/mediatek: gamma: Program gamma LUT type for descending or rising
  drm/mediatek: aal: Rewrite kerneldoc for struct mtk_disp_aal
  drm/mediatek: gamma: Add kerneldoc for struct mtk_disp_gamma
  drm/mediatek: aal: Compress of_device_id entries and add sentinel

Jason-JH.Lin (1):
  drm/mediatek: gamma: Adjust mtk_drm_gamma_set_common parameters

 drivers/gpu/drm/mediatek/mtk_disp_aal.c     |  84 ++++++--
 drivers/gpu/drm/mediatek/mtk_disp_drv.h     |   3 +-
 drivers/gpu/drm/mediatek/mtk_disp_gamma.c   | 203 ++++++++++++++++----
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c     |   8 +-
 drivers/gpu/drm/mediatek/mtk_drm_crtc.h     |   1 -
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c |   2 +
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |   9 +
 7 files changed, 256 insertions(+), 54 deletions(-)

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2.41.0