[RESEND 0/9] drm: Color pipeline teardown and follow-up fixes/improvements

[Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>]

This series contains follow-up fixes and improvements for the DRM color
pipeline infrastructure that was introduced in v6.19.[1][2]

The central handling of clean up of colorop from the mode_config list
is missing. While vkms calls drm_colorop_pipeline_destroy() in vkms_destroy(),
amd driver calls it only during failure of the init path and i915/xe driver
does not call it at all. This means amd and intel leaks these objects on
driver removal.

This series adds the teardown of mode_config.colorop_list in drm_mode_config_cleanup().
Since, i915/xe sub-classes the drm_colorop within intel_colorop it was not enough
to just use drm_colorop_pipeline_destroy(). Therefore, this series

- Introduces driver-managed destruction for drm_colorop objects and
  updates core helpers to use driver-provided destroy callbacks.
- Ensures all colorop objects are correctly torn down during
  mode_config cleanup and driver removal.

In addition to that following changes are made in the series
- Refactors i915 plane color pipeline initialization to reliably clean
  up partially constructed pipelines on failure.

Thanks for taking a look. Feedback is welcome.

[1] https://lore.kernel.org/dri-devel/cbe00ac4-a535-47d3-813a-e2eda7e9b991@amd.com/
[2] https://lore.kernel.org/intel-gfx/20251203085211.3663374-1-uma.shankar@intel.com/

v2:
 - Re-arrange patches (Alex)
 - Re-factor code to avoid repitition in pipeline creation (Suraj)

v3:
 - Add documentation only to function definition (Jani)
 - s/nvl/xe3plpd (Suraj)

resend:
 - for merge (remaining patches)

Chaitanya Kumar Borah (9):
  drm/colorop: Add destroy helper for colorop objects
  drm: Allow driver-managed destruction of colorop objects
  drm/amd/display: Hook up colorop destroy helper for plane pipelines
  drm/vkms: Hook up colorop destroy helper for plane pipelines
  drm/i915/display: Hook up intel_colorop_destroy
  drm: Clean up colorop objects during mode_config cleanup
  drm/vkms: Remove drm_colorop_pipeline_destroy() from vkms_destroy()
  drm/colorop: Use destroy callback for color pipeline teardown
  drm/i915/color: Add failure handling in plane color pipeline init

 .../amd/display/amdgpu_dm/amdgpu_dm_colorop.c |  27 ++-
 drivers/gpu/drm/drm_colorop.c                 |  49 +++--
 drivers/gpu/drm/drm_mode_config.c             |   6 +
 .../drm/i915/display/intel_color_pipeline.c   | 171 +++++++++++++-----
 drivers/gpu/drm/i915/display/intel_colorop.c  |   6 +
 drivers/gpu/drm/i915/display/intel_colorop.h  |   1 +
 drivers/gpu/drm/vkms/vkms_colorop.c           |  16 +-
 drivers/gpu/drm/vkms/vkms_drv.c               |   1 -
 include/drm/drm_colorop.h                     |  32 +++-
 9 files changed, 231 insertions(+), 78 deletions(-)

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2.25.1