linux-kernel - [PATCH v8 0/3] drm/msm/dpu: support virtual wide planes

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Message-Id: <20241215-dpu-virtual-wide-v8-0-65221f213ce1@linaro.org>
Date: Sun, 15 Dec 2024 14:40:15 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v8 0/3] drm/msm/dpu: support virtual wide planes

As promised in the basic wide planes support ([1]) here comes a series
supporting 2*max_linewidth for all the planes.

Note: Unlike v1 and v2 this series finally includes support for
additional planes - having more planes than the number of SSPP blocks.

Note: this iteration features handling of rotation and reflection of the
wide plane. However rot90 is still not tested: it is enabled on sc7280
and it only supports UBWC (tiled) framebuffers, it was quite low on my
priority list.

IGT tests were manually exectuted at [2].

[1] https://patchwork.freedesktop.org/series/99909/
[2] https://gitlab.freedesktop.org/drm/msm/-/merge_requests/142/pipelines

---
Changes in v8:
- Fixed missing argument description in dpu_rm_release_all_sspp()
- Link to v7: https://lore.kernel.org/r/20241130-dpu-virtual-wide-v7-0-991053fcf63c@linaro.org

Changes in v7:
- Unify code between dpu_plane_atomic_check() and
  dpu_plane_virtual_assign_resources() (Abhinav)
- Link to v6: https://lore.kernel.org/r/20241025-dpu-virtual-wide-v6-0-0310fd519765@linaro.org

Changes in v6:
- Renamed dpu_plane_atomic_check_nopipe() ->
  dpu_plane_atomic_check_nosspp() and dpu_plane_atomic_check_pipes() ->
  dpu_plane_atomic_check_sspp() (Abhinav)
- In dpu_rm_reserve_sspp() replaced hweight usage with explicit type
  allocation (Abhinav)
- In dpu_plane_atomic_check() set r_pipe->sspp (Jun Nie)
- In dpu_rm_reserve_sspp() check hw_sspp->ops.setup_scaler to rule out
  SSPP blocks with unsupported scaler blocks (RGB, QSEED2)
- Link to v5: https://lore.kernel.org/r/20240627-dpu-virtual-wide-v5-0-5efb90cbb8be@linaro.org

Changes in v5:
- Dropped extra dpu_kms instance from dpu_plane_atomic_check() (Abhinav)
- Use DRM_PLANE_NO_SCALING instead of (1 << 16) (Abhinav)
- Dropped excess returns documentation for dpu_rm_reserve_sspp() (Sui
  Jingfeng, Abhinav)
- best_weght -> best_weight (Abhinav)
- Moved drm_rect_width() call back to the the patch "split
  dpu_plane_atomic_check()" (Abhinav)
- Got rid of saved_fmt / saved dimensions (Abhinav)
- Expanded the commit message to describe SSPP allocation per CRTC id
  (Abhinav)
- Added comment on why the size change also causes resource reallocation
  (Abhinav)
- Dropeed several last "feature" patches, leaving only SSPP reallocation
  and using 2 SSPPs per plane for now. The rest will be submitted
  separately.

Changes since v3:
- Dropped the drm_atomic_helper_check_plane_noscale (Ville)
- Reworked the scaling factor according to global value and then check
  if SSPP has scaler_blk later on.
- Split drm_rect_fp_to_int from the rotation-related fix (Abhinav)

Changes since v2:
- Dropped the encoder-related parts, leave all resource allocation as is
  (Abhinav)
- Significantly reworked the SSPP allocation code
- Added debugging code to dump RM state in dri/N/state

Changes since v1:
- Fixed build error due to me missing one of fixups, it was left
  uncommitted.
- Implementated proper handling of wide plane rotation & reflection.

---
Dmitry Baryshkov (3):
      drm/msm/dpu: add support for virtual planes
      drm/msm/dpu: allow using two SSPP blocks for a single plane
      drm/msm/dpu: include SSPP allocation state into the dumped state

 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  50 ++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c   |  10 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h   |   4 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 396 ++++++++++++++++++++++++------
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h |  13 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c    |  89 +++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h    |  14 ++
 7 files changed, 498 insertions(+), 78 deletions(-)
---
base-commit: 86313a9cd152330c634b25d826a281c6a002eb77
change-id: 20240626-dpu-virtual-wide-beefb746a900

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>