[PATCH v4 0/3] drm/i915/fbc: Dirty rectangle bounding and CFB

[Austin Hu <austin.hu@intel.com>]

This series updates Intel FBC dirty rectangle handling and refactors plane
update checks:

1. Moves intel_fbc_can_flip_nuke() higher up in intel_fbc.c to avoid a
   forward declaration in subsequent FBC checks. (No functional change)
2. Clamps FBC dirty rectangle bounds to valid surface limits [y_offset,
   y_end] and adds logging for out-of-bounds coordinates, including
   handling for 180-degree plane rotation.
3. Tracks plane state attribute changes during atomic commits. When FBC
   Dirty Rectangle mode is active, partial updates only apply to surface
   address changes (PLANE_SURF). Modifications to any other plane state
   parameters require fetching full-plane pixel data from memory to
   re-compress and update the entire CFB in stolen memory. Once fully
   re-compressed, subsequent atomic commits can resume selective dirty
   rectangle updates.

v3 -> v4 changes:
  - Rebased onto latest drm-tip.

v2 -> v3 changes:
  - Split function reordering into a separate standalone commit (v3 1/3) to
    avoid mixing movement and functional changes, per maintainer feedback.
  - Rebased onto latest drm-tip.

v1 -> v2 changes:
  - Reused intel_fbc_can_flip_nuke() for plane update state checks as
    suggested.
  - Added plane Y-coordinate plane view checking (color_plane[0].y)
    alongside X.

Austin Hu (2):
  drm/i915/display/fbc: Move intel_fbc_can_flip_nuke() higher up
  drm/i915/fbc: nuke CFB if Plane setting (except for surf addr) changes

Charlton Lin (1):
  drm/i915/fbc: fbc_dirty_rect restrictions and logging

 drivers/gpu/drm/i915/display/intel_fbc.c | 192 +++++++++++++++++------
 1 file changed, 141 insertions(+), 51 deletions(-)

-- 
2.34.1