linux-kernel - [PATCH v2 0/7] Refactor drm_writeback

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Message-Id: <20251007054528.2900905-1-suraj.kandpal@intel.com>
Date: Tue,  7 Oct 2025 11:15:22 +0530
From: Suraj Kandpal <suraj.kandpal@...el.com>
To: linux-arm-msm@...r.kernel.org,
	freedreno@...ts.freedesktop.org,
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	Suraj Kandpal <suraj.kandpal@...el.com>
Subject: [PATCH v2 0/7] Refactor drm_writeback_connector structure

Some drivers cannot work with the current design where the connector
is embedded within the drm_writeback_connector such as intel and
some drivers that can get it working end up adding a lot of checks
all around the code to check if it's a writeback conenctor or not.
This is due to the inheritance limitation in C.
This series intends to solve it by moving the drm_writeback_connector
within the drm_connector and remove the drm_connector base which was in
drm_writeback_connector. This is done in union with hdmi connector
within drm_connector to save memory and since drm_connector cannot be
both hdmi and writeback it serves is well.
A RFC version was floated and discussion had taken place at [1] which
kicked of this more cleaner series. 
We do all other required modifications that come with these changes
along with addition of new function which returns the drm_connector when
drm_writeback_connector is present.
This series also contains some writeback API cleanups as a consequence
of writeback connector moving into drm_connector
All drivers will be expected to allocate the drm_connector.
This discussion was tiggered from [2] and sits on top of Dmitry's series
see [3].

[1] https://patchwork.freedesktop.org/series/152758/
[2] https://patchwork.freedesktop.org/series/152106/
[3] https://patchwork.freedesktop.org/series/152420/

Signed-off-by: Suraj Kandpal <suraj.kandpal@...el.com>

Suraj Kandpal (7):
  drm: writeback: Refactor drm_writeback_connector structure
  drm: writeback: Modify writeback init helpers
  drm: writeback: Modify drm_writeback_queue_job params
  drm: writeback: Modify drm_writeback_signal_completion param
  drm: writeback: Modify params for drm_writeback_get_out_fence
  drm/connector: Modify prepare_writeback_job helper
  drm/connector: Modify cleanup_writeback_job helper

 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 +--
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  2 +-
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c  | 12 +--
 .../gpu/drm/arm/display/komeda/komeda_crtc.c  |  2 +-
 .../gpu/drm/arm/display/komeda/komeda_kms.h   |  6 +-
 .../arm/display/komeda/komeda_wb_connector.c  | 11 +--
 drivers/gpu/drm/arm/malidp_crtc.c             |  2 +-
 drivers/gpu/drm/arm/malidp_drv.h              |  2 +-
 drivers/gpu/drm/arm/malidp_mw.c               |  7 +-
 drivers/gpu/drm/drm_atomic_uapi.c             |  4 +-
 drivers/gpu/drm/drm_writeback.c               | 51 ++++++++-----
 .../drm/msm/disp/dpu1/dpu_encoder_phys_wb.c   |  9 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 10 +--
 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.h |  4 +-
 .../gpu/drm/renesas/rcar-du/rcar_du_crtc.h    |  4 +-
 .../drm/renesas/rcar-du/rcar_du_writeback.c   | 12 ++-
 drivers/gpu/drm/vc4/vc4_txp.c                 |  8 +-
 drivers/gpu/drm/vkms/vkms_drv.h               |  2 +-
 drivers/gpu/drm/vkms/vkms_writeback.c         | 15 ++--
 include/drm/drm_connector.h                   | 69 ++++++++++++++++-
 include/drm/drm_modeset_helper_vtables.h      |  4 +-
 include/drm/drm_writeback.h                   | 76 ++-----------------
 22 files changed, 162 insertions(+), 160 deletions(-)

-- 
2.34.1