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Date:   Thu, 15 Jun 2023 13:29:39 +0300
From:   Pekka Paalanen <ppaalanen@gmail.com>
To:     Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Cc:     Melissa Wen <mwen@igalia.com>, airlied@gmail.com,
        alexander.deucher@amd.com, christian.koenig@amd.com,
        daniel@ffwll.ch, harry.wentland@amd.com,
        maarten.lankhorst@linux.intel.com, mripard@kernel.org,
        Rodrigo.Siqueira@amd.com, sunpeng.li@amd.com, tzimmermann@suse.de,
        Xinhui.Pan@amd.com, laurent.pinchart+renesas@ideasonboard.com,
        Shashank Sharma <shashank.sharma@amd.com>, alex.hung@amd.com,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        amd-gfx@lists.freedesktop.org, seanpaul@chromium.org,
        kernel-dev@igalia.com, bhawanpreet.lakha@amd.com,
        nicholas.kazlauskas@amd.com, Joshua Ashton <joshua@froggi.es>,
        sungjoon.kim@amd.com
Subject: Re: [RFC PATCH v2 00/18] Add DRM CRTC 3D LUT interface
Message-ID: <20230615132939.26a40559@eldfell>
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On Thu, 15 Jun 2023 10:07:35 +0200
Jacopo Mondi <jacopo.mondi@ideasonboard.com> wrote:

> Hi Pekka
>     thanks for the reply
>=20
> On Thu, Jun 15, 2023 at 10:14:05AM +0300, Pekka Paalanen wrote:
> > On Tue, 13 Jun 2023 17:43:55 +0200
> > Jacopo Mondi <jacopo.mondi@ideasonboard.com> wrote:
> > =20
> > > Hello
> > >
> > >    I'm completing the support for 3D LUT on R-Car DU peripheral
> > > and I have used this series as a base.
> > >
> > > I'm wondering, since quite some time has passed without any update if
> > > this series is still a thing and it makes any sense for me to try to
> > > bring it forward.
> > >
> > > I'm asking as I've noticed:
> > > "[PATCH 00/36] drm/amd/display: add AMD driver-specific properties fo=
r color mgmt"
> > >
> > > which seems to supersede this proposal with driver-specific
> > > properties.
> > >
> > > I asked Melissa privately but I wasn't able to get an hold of her, so
> > > if anyone has any clue feel free to reply :) =20
> >
> > Hi,
> >
> > since no-one else replied, I'll point you to the thread starting at
> > https://lists.freedesktop.org/archives/dri-devel/2023-May/403173.html =
=20
>=20
> Yes, Melissa pointed me to that series privately yesterday.
>=20
> However, and here I might be missing something, per-plane properties do
> not apply well to the HW pipeline I'm looking at.
>=20
> The R-Car DU has a 1D LUT and a 3D LUT at the CRTC level (I guess
> 'post blending' is the right term here) ?  A per-plane property
> doesn't seem to match how the HW work, but please feel free to correct
> me as this is all rather new to me and I might be overlooking
> something.

Post-blending, correct. The long term plan is to replicate the same
idea to post-blending as it is planned for pre-blending.

>=20
> My plan at the moment would have been to base my work on Melissa's RFC
> and re-send to prop discussions, unless it is certainly a dead-end and
> I have missed how to properly use per-plane properties on our HW.

I'm not a kernel dev nor a maintainer, so I can't comment on what would
be acceptable in the mean time before the new pipeline design is
implemented. The long term plan is to supersede all existing color
transformation related properties with pipelines.


Thanks,
pq

>=20
> Thank you!
>=20
> > and continuing to June. That is the plan of getting a common UAPI for
> > these things.
> >
> >
> > Thanks,
> > pq
> >
> > =20
> > >
> > > Thanks
> > >   j
> > >
> > > On Mon, Jan 09, 2023 at 01:38:28PM -0100, Melissa Wen wrote: =20
> > > > Hi,
> > > >
> > > > After collecting comments in different places, here is a second ver=
sion
> > > > of the work on adding DRM CRTC 3D LUT support to the current DRM co=
lor
> > > > mgmt interface. In comparison to previous proposals [1][2][3], here=
 we
> > > > add 3D LUT before gamma 1D LUT, but also a shaper 1D LUT before 3D =
LUT,
> > > > that means the following DRM CRTC color correction pipeline:
> > > >
> > > > Blend -> Degamma 1D LUT -> CTM -> Shaper 1D LUT -> 3D LUT -> Gamma =
1D LUT
> > > >
> > > > and we also add a DRM CRTC LUT3D_MODE property, based on Alex Hung
> > > > proposal for pre-blending 3D LUT [4] (Thanks!), instead of just a
> > > > LUT3D_SIZE, that allows userspace to use different supported settin=
gs of
> > > > 3D LUT, fitting VA-API and new color API better. In this sense, I
> > > > adjusted the pre-blending proposal for post-blending usage.
> > > >
> > > > Patches 1-6 targets the addition of shaper LUT and 3D LUT propertie=
s to
> > > > the current DRM CRTC color mgmt pipeline. Patch 6 can be considered=
 an
> > > > extra/optional patch to define a default value for LUT3D_MODE, insp=
ired
> > > > by what we do for the plane blend mode property (pre-multiplied).
> > > >
> > > > Patches 7-18 targets AMD display code to enable shaper and 3D LUT u=
sage
> > > > on DCN 301 (our HW case). Patches 7-9 performs code cleanups on cur=
rent
> > > > AMD DM colors code, patch 10 updates AMD stream in case of user 3D =
LUT
> > > > changes, patch 11/12 rework AMD MPC 3D LUT resource handling by con=
text
> > > > for DCN 301 (easily extendible to other DCN families). Finally, from
> > > > 13-18, we wire up SHAPER LUT, LUT3D and LUT3D MODE to AMD display
> > > > driver, exposing modes supported by HW and programming user shaper =
and
> > > > 3D LUT accordingly.
> > > >
> > > > Our target userspace is Gamescope/SteamOS.
> > > >
> > > > Basic IGT tests were based on [5][6] and are available here (in-pro=
gress):
> > > > https://gitlab.freedesktop.org/mwen/igt-gpu-tools/-/commits/crtc-lu=
t3d-api
> > > >
> > > > [1] https://lore.kernel.org/all/20201221015730.28333-1-laurent.pinc=
hart+renesas@ideasonboard.com/
> > > > [2] https://github.com/vsyrjala/linux/commit/4d28e8ddf2a076f30f9e5b=
dc17cbb4656fe23e69
> > > > [3] https://lore.kernel.org/amd-gfx/20220619223104.667413-1-mwen@ig=
alia.com/
> > > > [4] https://lore.kernel.org/dri-devel/20221004211451.1475215-1-alex=
.hung@amd.com/
> > > > [5] https://patchwork.freedesktop.org/series/90165/
> > > > [6] https://patchwork.freedesktop.org/series/109402/
> > > > [VA_API] http://intel.github.io/libva/structVAProcFilterParameterBu=
ffer3DLUT.html
> > > > [KMS_pipe_API] https://gitlab.freedesktop.org/pq/color-and-hdr/-/is=
sues/11
> > > >
> > > > Let me know your thoughts.
> > > >
> > > > Thanks,
> > > >
> > > > Melissa
> > > >
> > > > Alex Hung (2):
> > > >   drm: Add 3D LUT mode and its attributes
> > > >   drm/amd/display: Define 3D LUT struct for HDR planes
> > > >
> > > > Melissa Wen (16):
> > > >   drm/drm_color_mgmt: add shaper LUT to color mgmt properties
> > > >   drm/drm_color_mgmt: add 3D LUT props to DRM color mgmt
> > > >   drm/drm_color_mgmt: add function to create 3D LUT modes supported
> > > >   drm/drm_color_mgmt: add function to attach 3D LUT props
> > > >   drm/drm_color_mgmt: set first lut3d mode as default
> > > >   drm/amd/display: remove unused regamma condition
> > > >   drm/amd/display: add comments to describe DM crtc color mgmt beha=
vior
> > > >   drm/amd/display: encapsulate atomic regamma operation
> > > >   drm/amd/display: update lut3d and shaper lut to stream
> > > >   drm/amd/display: handle MPC 3D LUT resources for a given context
> > > >   drm/amd/display: acquire/release 3D LUT resources for ctx on DCN3=
01
> > > >   drm/amd/display: expand array of supported 3D LUT modes
> > > >   drm/amd/display: enable 3D-LUT DRM properties if supported
> > > >   drm/amd/display: add user 3D LUT support to the amdgpu_dm color
> > > >     pipeline
> > > >   drm/amd/display: decouple steps to reuse in shaper LUT support
> > > >   drm/amd/display: add user shaper LUT support to amdgpu_dm color
> > > >     pipeline
> > > >
> > > >  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   6 +
> > > >  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |   3 +
> > > >  .../amd/display/amdgpu_dm/amdgpu_dm_color.c   | 370 ++++++++++++++=
++--
> > > >  .../amd/display/amdgpu_dm/amdgpu_dm_crtc.c    |   2 +
> > > >  drivers/gpu/drm/amd/display/dc/core/dc.c      |  49 ++-
> > > >  drivers/gpu/drm/amd/display/dc/dc.h           |   8 +
> > > >  .../amd/display/dc/dcn301/dcn301_resource.c   |  47 ++-
> > > >  .../amd/display/modules/color/color_gamma.h   |  43 ++
> > > >  drivers/gpu/drm/drm_atomic_state_helper.c     |   7 +
> > > >  drivers/gpu/drm/drm_atomic_uapi.c             |  24 ++
> > > >  drivers/gpu/drm/drm_color_mgmt.c              | 127 ++++++
> > > >  drivers/gpu/drm/drm_fb_helper.c               |   5 +
> > > >  drivers/gpu/drm/drm_mode_config.c             |  21 +
> > > >  include/drm/drm_color_mgmt.h                  |   8 +
> > > >  include/drm/drm_crtc.h                        |  32 +-
> > > >  include/drm/drm_mode_config.h                 |  25 ++
> > > >  include/drm/drm_mode_object.h                 |   2 +-
> > > >  include/uapi/drm/drm_mode.h                   |  17 +
> > > >  18 files changed, 757 insertions(+), 39 deletions(-)
> > > >
> > > > --
> > > > 2.35.1
> > > > =20
> > =20
>=20
>=20


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