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Message-ID: <b8b1dd2d-069d-4410-a3a1-d1cdb61fd4a8@amd.com>
Date: Wed, 6 Sep 2023 15:33:24 -0400
From: Harry Wentland <harry.wentland@....com>
To: Melissa Wen <mwen@...lia.com>, amd-gfx@...ts.freedesktop.org,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
sunpeng.li@....com, Alex Deucher <alexander.deucher@....com>,
dri-devel@...ts.freedesktop.org, airlied@...il.com,
brian.starkey@....com, christian.koenig@....com, daniel@...ll.ch,
liviu.dudau@....com, maarten.lankhorst@...ux.intel.com,
mripard@...nel.org, tzimmermann@...e.de, Xinhui.Pan@....com
Cc: Joshua Ashton <joshua@...ggi.es>,
Sebastian Wick <sebastian.wick@...hat.com>,
Xaver Hugl <xaver.hugl@...il.com>,
Shashank Sharma <Shashank.Sharma@....com>,
Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
sungjoon.kim@....com, Alex Hung <alex.hung@....com>,
Pekka Paalanen <pekka.paalanen@...labora.com>,
Simon Ser <contact@...rsion.fr>, kernel-dev@...lia.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/34] drm/amd/display: add AMD driver-specific
properties for color mgmt
On 2023-08-10 12:02, Melissa Wen wrote:
> 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.
>
Thanks again for your amazing work on this.
Patches 5, 6, 14, 16, and 24 are
Reviewed-by: Harry Wentland <harry.wentland@....com>
I left comments on the remaining unreviewed patches.
Harry
> 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(-)
>
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