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b=0pT2Nl21JdzU5xMwGT04JAmuq2u6HdmK8ArBt9wNO6tBZLjEXSMZWKn76DLhwJhpPppBmwVNcQietlQVAh9+WrnDVkxj5NgEADjR+bNQYpY7GHrJdyNSoZI2qclUu1+wPU9cGy36N5twfzNn8M6RDJd115gaaaYEuqUdZu06s1s= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CO6PR12MB5427.namprd12.prod.outlook.com (2603:10b6:5:358::13) by IA1PR12MB6113.namprd12.prod.outlook.com (2603:10b6:208:3eb::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9160.17; Mon, 29 Sep 2025 14:25:53 +0000 Received: from CO6PR12MB5427.namprd12.prod.outlook.com ([fe80::9e93:67dd:49ac:bc14]) by CO6PR12MB5427.namprd12.prod.outlook.com ([fe80::9e93:67dd:49ac:bc14%6]) with mapi id 15.20.9160.008; Mon, 29 Sep 2025 14:25:53 +0000 Message-ID: <7884e68f-48bc-4218-ac21-150751a79723@amd.com> Date: Mon, 29 Sep 2025 10:25:20 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 00/20] Introduce support for post-blend color pipeline To: Melissa Wen , =?UTF-8?B?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Chun-Kuang Hu , Philipp Zabel , Matthias Brugger , AngeloGioacchino Del Regno , Haneen Mohammed , Melissa Wen Cc: Alex Hung , wayland-devel@lists.freedesktop.org, leo.liu@amd.com, ville.syrjala@linux.intel.com, pekka.paalanen@collabora.com, contact@emersion.fr, jadahl@redhat.com, sebastian.wick@redhat.com, shashank.sharma@amd.com, agoins@nvidia.com, joshua@froggi.es, mdaenzer@redhat.com, aleixpol@kde.org, xaver.hugl@gmail.com, victoria@system76.com, uma.shankar@intel.com, quic_naseer@quicinc.com, quic_cbraga@quicinc.com, quic_abhinavk@quicinc.com, marcan@marcan.st, Liviu.Dudau@arm.com, sashamcintosh@google.com, chaitanya.kumar.borah@intel.com, louis.chauvet@bootlin.com, mcanal@igalia.com, kernel@collabora.com, daniels@collabora.com, leandro.ribeiro@collabora.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Simona Vetter References: <20250917-mtk-post-blend-color-pipeline-v2-0-ac4471b44758@collabora.com> <4d4170fc-f91a-4e15-b8a0-317b1af8324e@igalia.com> Content-Language: en-US From: Harry Wentland In-Reply-To: <4d4170fc-f91a-4e15-b8a0-317b1af8324e@igalia.com> Content-Type: text/plain; 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R. A. Prado wrote: >> This series is based on "Color Pipeline API w/ VKMS" [1]. It reuses the >> same concept of a color pipeline API but for the post-blend stage >> instead of pre-blend, by attaching the COLOR_PIPELINE property to the >> CRTC rather than a plane. > > Hi all, > > I'm confused about the timing of this series being reviewed. > Hadn't we agreed in past hackfest on discussing post-blending color API > only after we have sorted out pre-blending color properties? I don't think it's a problem to have people with bandwidth looking at the post-blending portion, especially if they weren't involved in the pre-blending patchset. I find it helpful to look at this and it proofs (to me) that the direction of the pre-blending design is correct. I don't (necessarily) like how it re-opens questions that we discussed previously, such as hiding legacy properties, and would be hesitant to change this on the pre-blending patches and therefore delay the merge even further. > There are still open questions around color_encoding and color_range, > for example... I apologize if I missed key bits that might require attention. Could you elaborate on the open questions? > How assertive can we be evaluating the post-blending API now? As people wait on the pre-blending pipeline to merged it makes sense to start looking at the next steps. I would like the IGT patches to be reviewed before we merge the pre- blending pipeline. Otherwise I think it's ready. Harry > > Best Regards, > > Melissa > >> >> The patches in the series first implement the necessary changes in the >> DRM core to allow for post-blend color pipelines and expose it through >> the uAPI, and then implement support in both the MediaTek KMS driver and >> in VKMS. >> >> This series has been tested with IGT, with the "Support post-blend color >> pipeline API" series [2] applied, on top of VKMS, as well as with >> Weston, with a WIP branch [3], on a MT8195-Tomato Chromebook, where both >> gamma LUT and CTM color transformations have been simultaneously >> configured in hardware through the API and validated (test commits for >> weston at [4] and for kernel at [5]). >> >> [1] https://lore.kernel.org/all/20250815035047.3319284-1- >> alex.hung@amd.com/ >> [2] https://lore.kernel.org/igt-dev/20250912-post-blend-colorops- >> v1-0-83fc62420cba@collabora.com/T/#t >> [3] https://gitlab.collabora.com/nfraprado/weston/-/tree/post-blend- >> colorops?ref_type=heads >> [4] https://gitlab.collabora.com/nfraprado/weston/-/tree/post-blend- >> color-pipeline-lut-ctm-test?ref_type=tags >> [5] https://gitlab.collabora.com/nfraprado/linux/-/tree/debug-ctm-lut- >> data-post-blend-colorop?ref_type=tags >> >> Signed-off-by: Nícolas F. R. A. Prado >> --- >> Changes in v2: >> - Split core DRM changes for post-blend color pipelines from single >>    commit into smaller changes >> - Added post-blend color pipeline support in VKMS >> - Introduced driver cap, and made client cap depend on it (daniels) >> - Made deprecated color props (GAMMA_LUT, DEGAMMA_LUT, CTM) available as >>    read-only when post-blend color pipelines are enabled (daniels) >> - Created colorop_modeset_lock/unlock to commonize locking pattern for >>    colorops (louis.chauvet) >> - Added helper for post-blend 1D curve colorop creation >> - Link to v1: https://lore.kernel.org/r/20250822-mtk-post-blend-color- >> pipeline-v1-0-a9446d4aca82@collabora.com >> >> --- >> Nícolas F. R. A. Prado (20): >>        drm/crtc: Add color pipeline to CRTC state >>        drm/colorop: Allow parenting colorop to CRTC >>        drm: Factor out common color_pipeline property initialization code >>        drm/crtc: Add COLOR_PIPELINE property >>        drm: Introduce DRM_CAP_POST_BLEND_COLOR_PIPELINE >>        drm: Introduce DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE >>        drm/atomic: Pass post_blend_color_pipeline client cap to atomic >> check >>        drm/atomic: Print the color pipeline as part of the CRTC state >> print >>        drm/colorop: Factor out common paths from colorops helpers >>        drm/colorop: Introduce colorop helpers for crtc >>        drm/colorop: Export drm_colorop_cleanup() so drivers can extend it >>        drm/crtc: Track post-blend color pipeline client cap in >> drm_crtc_state >>        drm/mediatek: Support post-blend colorops for gamma and ctm >>        drm/mediatek: ccorr: Support post-blend color pipeline API >>        drm/mediatek: gamma: Support post-blend color pipeline API >>        drm/mediatek: Set post-blend color pipeline driver cap >>        drm/vkms: Rename existing color pipeline helpers to contain >> "pre_blend" >>        drm/vkms: Prepare pre_blend_color_transform() for post-blend >> pipelines >>        drm/vkms: Introduce support for post-blend color pipeline >>        drm/vkms: Set post-blend color pipeline driver cap >> >>   drivers/gpu/drm/drm_atomic.c              |   9 +- >>   drivers/gpu/drm/drm_atomic_uapi.c         |  65 +++++++- >>   drivers/gpu/drm/drm_colorop.c             | 245 ++++++++++++++++++++ >> ++++------ >>   drivers/gpu/drm/drm_connector.c           |   1 + >>   drivers/gpu/drm/drm_crtc.c                |  77 ++++++++++ >>   drivers/gpu/drm/drm_crtc_internal.h       |   6 + >>   drivers/gpu/drm/drm_ioctl.c               |  12 ++ >>   drivers/gpu/drm/drm_mode_object.c         |   9 ++ >>   drivers/gpu/drm/drm_plane.c               |  36 +---- >>   drivers/gpu/drm/mediatek/mtk_crtc.c       | 208 ++++++++++++++++++++ >> ++++- >>   drivers/gpu/drm/mediatek/mtk_ddp_comp.c   |   6 +- >>   drivers/gpu/drm/mediatek/mtk_ddp_comp.h   |   2 + >>   drivers/gpu/drm/mediatek/mtk_disp_ccorr.c | 100 ++++++++++-- >>   drivers/gpu/drm/mediatek/mtk_disp_drv.h   |   6 +- >>   drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 107 ++++++++++--- >>   drivers/gpu/drm/mediatek/mtk_drm_drv.c    |   3 +- >>   drivers/gpu/drm/vkms/vkms_colorop.c       | 106 ++++++++++++- >>   drivers/gpu/drm/vkms/vkms_composer.c      |  13 +- >>   drivers/gpu/drm/vkms/vkms_crtc.c          |   1 + >>   drivers/gpu/drm/vkms/vkms_drv.c           |   3 +- >>   drivers/gpu/drm/vkms/vkms_drv.h           |   3 +- >>   drivers/gpu/drm/vkms/vkms_plane.c         |   2 +- >>   include/drm/drm_atomic.h                  |  20 +++ >>   include/drm/drm_atomic_uapi.h             |   2 + >>   include/drm/drm_colorop.h                 |  22 ++- >>   include/drm/drm_crtc.h                    |  27 ++++ >>   include/drm/drm_drv.h                     |   6 + >>   include/drm/drm_file.h                    |   7 + >>   include/uapi/drm/drm.h                    |  25 +++ >>   29 files changed, 994 insertions(+), 135 deletions(-) >> --- >> base-commit: 342e5ee08797cde0e8af30e6110a5dc1cba61e9c >> change-id: 20250730-mtk-post-blend-color-pipeline-498e1a9cc53e >> >> Best regards, >