linux-kernel - [PATCH v2 00/11] drm/msm: rework the ties between KMS and GPU parts of the driver

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Message-Id: <20250503-msm-gpu-split-v2-0-1292cba0f5ad@oss.qualcomm.com>
Date: Sat, 03 May 2025 10:16:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <lumag@...nel.org>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 00/11] drm/msm: rework the ties between KMS and GPU
 parts of the driver

Currently the KMS and GPU parts of the msm driver are pretty much
intertwined. It is impossible to register a KMS-only device and
registering a GPU-only DRM device requires modifying the DT.  Not to
mention that binding the GPU-only device creates an interim platform
devices, which complicates IOMMU setup.

Rework the driver:
- Make it possible to disable KMS parts (if MDP4, MDP5 and DPU drivers
  are disabled).
- Register GPU-only devices without an interim platform device.
- Add module param that makes msm driver register GPU and KMS devices
  separately.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v2:
- Got rid of mdp4_crtc.id and msm_drm_private.num_crtcs
- Moved msm_drm_private.wq and msm_drm_private.event_thread to struct
  msm_kms (Rob Clark)
- Moved HDMI / DSI / DP pointers to msm_kms (Abhinav)
- Link to v1: https://lore.kernel.org/r/20250413-msm-gpu-split-v1-0-1132f4b616c7@oss.qualcomm.com

---
Dmitry Baryshkov (11):
      drm/msm: move wq handling to KMS code
      drm/msm: move helper calls to msm_kms.c
      drm/msm/mdp4: get rid of mdp4_crtc.id
      drm/msm: get rid of msm_drm_private::num_crtcs
      drm/msm: move KMS driver data to msm_kms
      drm/msm: make it possible to disable KMS-related code.
      drm/msm: bail out late_init_minor() if it is not a GPU device
      drm/msm: rearrange symbol selection
      drm/msm: rework binding of Imageon GPUs
      drm/msm: enable separate binding of GPU and display devices
      drm/msm: make it possible to disable GPU support

 drivers/gpu/drm/msm/Kconfig                       |  54 ++++--
 drivers/gpu/drm/msm/Makefile                      |  31 +--
 drivers/gpu/drm/msm/adreno/adreno_device.c        |  39 +---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c          |   4 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c       |  13 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c           |  35 ++--
 drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c         |   9 +-
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c          |  13 +-
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h          |   2 +-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c         |   2 +-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c          |  17 +-
 drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c |  12 +-
 drivers/gpu/drm/msm/dp/dp_debug.c                 |   4 +
 drivers/gpu/drm/msm/dp/dp_display.c               |   6 +-
 drivers/gpu/drm/msm/dsi/dsi.c                     |   4 +-
 drivers/gpu/drm/msm/hdmi/hdmi.c                   |  13 +-
 drivers/gpu/drm/msm/msm_debugfs.c                 | 222 ++++++++++++----------
 drivers/gpu/drm/msm/msm_drv.c                     | 205 +++++++++++++-------
 drivers/gpu/drm/msm/msm_drv.h                     |  34 ++--
 drivers/gpu/drm/msm/msm_gpu.h                     |  71 ++++++-
 drivers/gpu/drm/msm/msm_kms.c                     |  41 +++-
 drivers/gpu/drm/msm/msm_kms.h                     |  46 +++++
 drivers/gpu/drm/msm/msm_submitqueue.c             |  12 +-
 23 files changed, 549 insertions(+), 340 deletions(-)
---
base-commit: 37ff6e9a2ce321b7932d3987701757fb4d87b0e6
change-id: 20250411-msm-gpu-split-2701e49e40f0

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>