[PATCH v6 0/9] drm: writeback: clean up writeback connector initialization

[Dmitry Baryshkov]

Drivers using drm_writeback_connector_init() / _with_encoder() don't
perform cleanup in a manner similar to drmm_writeback_connector_init()
(see drm_writeback_connector_cleanup()). Migrate all existing drivers
to use drmm_writeback_connector_init(), drop
drm_writeback_connector_init() and drm_writeback_connector::encoder
(it's unused afterwards).

This series leaves former drm_writeback_connector_init_with_encoder()
(renamed to drm_writeback_connector_init as a non-managed counterpart
for drmm_writeback_connector_init()). It is supposed to be used by
drivers which can not use drmm functions (like Intel). However I think
it would be better to drop it completely.

---
Changes in v6:
- Dropped applied patch
- Implemented suggestion by Alex to use drmm allocation for the
  writeback connector.
- Link to v5: https://patch.msgid.link/20260505-wb-drop-encoder-v5-0-42567b7c7af2@xxxxxxxxxxxxxxxx

Changes in v5:
- Rebased on top of drm-misc-next
- Expanded commit message for msm patch, describing devm vs drmm issues (Laurent)
- Expanded commit messages, describing why the drivers are converted to
  drmm_writeback_connector_init() (Laurent)
- Link to v4: https://lore.kernel.org/r/20251228-wb-drop-encoder-v4-0-58d28e668901@xxxxxxxxxxxxxxxx

Changes in v4:
- Rebase on top of drm-misc-next, dropping applied patch.
- Added a note regarding memory leak in the AMDGPU driver.
- Fixed a devm vs drmm issue in the msm/dpu driver.
- Link to v3: https://lore.kernel.org/r/20250819-wb-drop-encoder-v3-0-b48a6af7903b@xxxxxxxxxxxxxxxx

Changes in v3:
- Fixed subject prefix for the rcar-du patch (Jessica Zhang)
- Link to v2: https://lore.kernel.org/r/20250816-wb-drop-encoder-v2-0-f951de04f4f9@xxxxxxxxxxxxxxxx

Changes in v2:
- Switched to drm_crtc_mask() where applicable (Louis Chauvet)
- Link to v1: https://lore.kernel.org/r/20250801-wb-drop-encoder-v1-0-824646042f7d@xxxxxxxxxxxxxxxx

To: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
To: Maxime Ripard <mripard@xxxxxxxxxx>
To: Thomas Zimmermann <tzimmermann@xxxxxxx>
To: David Airlie <airlied@xxxxxxxxx>
To: Simona Vetter <simona@xxxxxxxx>
To: Harry Wentland <harry.wentland@xxxxxxx>
To: Leo Li <sunpeng.li@xxxxxxx>
To: Rodrigo Siqueira <siqueira@xxxxxxxxxx>
To: Alex Deucher <alexander.deucher@xxxxxxx>
To: Christian König <christian.koenig@xxxxxxx>
To: Liviu Dudau <liviu.dudau@xxxxxxx>
To: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
To: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>
To: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
To: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
To: Magnus Damm <magnus.damm@xxxxxxxxx>
To: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
To: Maíra Canal <mcanal@xxxxxxxxxx>
To: Raspberry Pi Kernel Maintenance <kernel-list@xxxxxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-renesas-soc@xxxxxxxxxxxxxxx

---
Dmitry Baryshkov (9):
      drm/managed: implement managed versions of kzalloc_obj/objs()
      drm/amd/display: use drmm allocation for writeback connector
      drm/amd/display: use drmm_writeback_connector_init()
      drm/komeda: use drmm_writeback_connector_init()
      drm/mali: use drmm_writeback_connector_init()
      drm: renesas: rcar-du: use drmm_writeback_connector_init()
      drm/vc4: use drmm_writeback_connector_init()
      drm: writeback: drop excess connector initialization functions
      drm: writeback: rename drm_writeback_connector_init_with_encoder()

 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c  |  7 ++-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c   | 18 ++++--
 .../drm/arm/display/komeda/komeda_wb_connector.c   | 30 ++++++----
 drivers/gpu/drm/arm/malidp_mw.c                    | 25 ++++----
 drivers/gpu/drm/drm_writeback.c                    | 69 +++-------------------
 .../gpu/drm/renesas/rcar-du/rcar_du_writeback.c    | 22 ++++---
 drivers/gpu/drm/vc4/vc4_txp.c                      |  9 ++-
 include/drm/drm_managed.h                          | 22 +++++++
 include/drm/drm_writeback.h                        | 22 +------
 9 files changed, 98 insertions(+), 126 deletions(-)
---
base-commit: 2afdfc658f7a7e9ee2a67ec6663922da9c799c53
change-id: 20250801-wb-drop-encoder-97a0c75bd5d7

Best regards,
--  
With best wishes
Dmitry