[PATCH v2 00/34] drm/amd/display: add AMD driver-specific properties for color mgmt

[Melissa Wen <mwen@igalia.com>]

Hi all,

Here is the next version of our work to enable AMD driver-specific color
management properties [1][2]. This series is a collection of
contributions from Joshua, Harry, and me to enhance the AMD KMS color
pipeline for Steam Deck/SteamOS by exposing additional pre-blending and
post-blending color capabilities from those available in the current DRM
KMS API[3].

The userspace case here is Gamescope which is the compositor for
SteamOS. Gamescope is already using these features to implement its
color management pipeline [4].

In this version, I try to address all concerns shared in the previous
one, i.e.:
- Replace DRM_ by AMDGPU_ prefix for transfer function enumeration; 
- Explicitly define EOTFs and inverse EOTFs and set props accordingly;
- Document pre-defined transfer functions;
- Remove misleading comments;
- Remove post-blending/MPC shaper and 3D LUT support;
- Move driver-specific property operations from amdgpu_display.c to
  amdgpu_dm_color.c;
- Reset planes if any color props change;
- Nits/small fixes;

Bearing in mind the complexity of color concepts, I believe there is a
high chance of some misunderstanding from my side when defining EOTFs
and documenting pre-defined TFs. So, reviews are very important and
welcome (thanks in advance). FWIW, I added Harry as a co-developer of
this TF documentation since I based on his description of EOTF/inv_EOTF
and previous documentation work [5]. Let me know if there is a better
way for credits.

Two DC patches were already applied and, therefore, removed from the
series. I added r-b according to previous feedback. We also add plane
CTM to driver-specific properties. As a result, this is the updated list
of all driver-specific color properties exposed by this series:

- plane degamma LUT and pre-defined TF;
- plane HDR multiplier;
- plane CTM 3x4;
- plane shaper LUT and pre-defined TF;
- plane 3D LUT;
- plane blend LUT and pre-defined TF;
- CRTC gamma pre-defined TF;

Remember you can find the AMD HW color capabilities documented here:
https://dri.freedesktop.org/docs/drm/gpu/amdgpu/display/display-manager.html#color-management-properties

Worth mentioning that the pre-blending degamma block can use ROM curves
for some pre-defined TFs, but the other blocks use the AMD color module
to calculate this curve considering pre-defined coefficients.

We need changes on DC gamut remap matrix to support the plane and CRTC
CTM on drivers that support both. I've sent a previous patch to apply
these changes to all DCN3+ families [6]. Here I use the same changes but
limited to DCN301. Just let me know if you prefer the previous/expanded
version.

Finally, this is the Linux/AMD color management API before and after
blending with the driver-specific properties:

+----------------------+
|   PLANE              |
|                      |
|  +----------------+  |
|  | AMD Degamma    |  |
|  |                |  |
|  | EOTF | 1D LUT  |  |
|  +--------+-------+  |
|           |          |
|  +--------v-------+  |
|  |    AMD HDR     |  |
|  |    Multiply    |  |
|  +--------+-------+  |
|           |          |
|  +--------v-------+  |
|  |  AMD CTM (3x4) |  |
|  +--------+-------+  |
|           |          |
|  +--------v-------+  |
|  | AMD Shaper     |  |
|  |                |  |
|  | inv_EOTF |     |  |
|  | Custom 1D LUT  |  |
|  +--------+-------+  |
|           |          |
|  +--------v-------+  |
|  |   AMD 3D LUT   |  |
|  |   17^3/12-bit  |  |
|  +--------+-------+  |
|           |          |
|  +--------v-------+  |
|  | AMD Blend      |  |
|  |                |  |
|  | EOTF | 1D LUT  |  |
|  +--------+-------+  |
|           |          |
++----------v---------++
||      Blending      ||
++----------+---------++
|    CRTC   |          |
|           |          |
|   +-------v-------+  |
|   | DRM Degamma   |  |
|   |               |  |
|   | Custom 1D LUT |  |
|   +-------+-------+  |
|           |          |
|   +-------v-------+  |
|   | DRM CTM (3x3) |  |
|   +-------+-------+  |
|           |          |
|   +-------v-------+  |
|   | DRM Gamma     |  |
|   |               |  |
|   | Custom 1D LUT |  |
|   +---------------+  |
|   | *AMD Gamma    |  |
|   |   inv_EOTF    |  |
|   +---------------+  |
|                      |
+----------------------+

Let me know your thoughts.

Best Regards,

Melissa Wen

[1] https://lore.kernel.org/dri-devel/20230423141051.702990-1-mwen@igalia.com
[2] https://lore.kernel.org/dri-devel/20230523221520.3115570-1-mwen@igalia.com
[3] https://github.com/ValveSoftware/gamescope/blob/master/src/docs/Steam%20Deck%20Display%20Pipeline.png
[4] https://github.com/ValveSoftware/gamescope
[5] https://lore.kernel.org/dri-devel/20210730204134.21769-1-harry.wentland@amd.com
[6] https://lore.kernel.org/dri-devel/20230721132431.692158-1-mwen@igalia.com


Harry Wentland (1):
  drm/amd/display: fix segment distribution for linear LUTs

Joshua Ashton (14):
  drm/amd/display: add plane degamma TF driver-specific property
  drm/amd/display: add plane HDR multiplier driver-specific property
  drm/amd/display: add plane blend LUT and TF driver-specific properties
  drm/amd/display: add CRTC gamma TF support
  drm/amd/display: set sdr_ref_white_level to 80 for out_transfer_func
  drm/amd/display: mark plane as needing reset if color props change
  drm/amd/display: add plane degamma TF and LUT support
  drm/amd/display: add dc_fixpt_from_s3132 helper
  drm/amd/display: add HDR multiplier support
  drm/amd/display: handle empty LUTs in __set_input_tf
  drm/amd/display: add plane blend LUT and TF support
  drm/amd/display: allow newer DC hardware to use degamma ROM for PQ/HLG
  drm/amd/display: copy 3D LUT settings from crtc state to stream_update
  drm/amd/display: Use 3x4 CTM for plane CTM

Melissa Wen (19):
  drm/drm_mode_object: increase max objects to accommodate new color
    props
  drm/drm_property: make replace_property_blob_from_id a DRM helper
  drm/drm_plane: track color mgmt changes per plane
  drm/amd/display: add driver-specific property for plane degamma LUT
  drm/amd/display: explicitly define EOTF and inverse EOTF
  drm/amd/display: document AMDGPU pre-defined transfer functions
  drm/amd/display: add plane 3D LUT driver-specific properties
  drm/amd/display: add plane shaper LUT and TF driver-specific
    properties
  drm/amd/display: add CRTC gamma TF driver-specific property
  drm/amd/display: add comments to describe DM crtc color mgmt behavior
  drm/amd/display: encapsulate atomic regamma operation
  drm/amd/display: decouple steps for mapping CRTC degamma to DC plane
  drm/amd/display: reject atomic commit if setting both plane and CRTC
    degamma
  drm/amd/display: add plane shaper LUT support
  drm/amd/display: add plane shaper TF support
  drm/amd/display: add plane 3D LUT support
  drm/amd/display: set stream gamut remap matrix to MPC for DCN301
  drm/amd/display: add plane CTM driver-specific property
  drm/amd/display: add plane CTM support

 drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h      |  71 ++
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  34 +-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 101 +++
 .../amd/display/amdgpu_dm/amdgpu_dm_color.c   | 805 ++++++++++++++++--
 .../amd/display/amdgpu_dm/amdgpu_dm_crtc.c    |  72 ++
 .../amd/display/amdgpu_dm/amdgpu_dm_plane.c   | 224 ++++-
 .../amd/display/dc/dcn10/dcn10_cm_common.c    |  93 +-
 .../drm/amd/display/dc/dcn30/dcn30_hwseq.c    |  37 +
 .../drm/amd/display/dc/dcn30/dcn30_hwseq.h    |   3 +
 .../drm/amd/display/dc/dcn301/dcn301_init.c   |   2 +-
 .../gpu/drm/amd/display/include/fixed31_32.h  |  12 +
 drivers/gpu/drm/arm/malidp_crtc.c             |   2 +-
 drivers/gpu/drm/drm_atomic.c                  |   1 +
 drivers/gpu/drm/drm_atomic_state_helper.c     |   1 +
 drivers/gpu/drm/drm_atomic_uapi.c             |  43 +-
 drivers/gpu/drm/drm_property.c                |  49 ++
 include/drm/drm_mode_object.h                 |   2 +-
 include/drm/drm_plane.h                       |   7 +
 include/drm/drm_property.h                    |   6 +
 include/uapi/drm/drm_mode.h                   |   8 +
 20 files changed, 1446 insertions(+), 127 deletions(-)

-- 
2.40.1