perform the same seamlessness guard and minimal transition:
  - Seamless check and minimal transition in update path:
    drivers/gpu/drm/amd/display/dc/core/dc.c:4957-4961
- The seamlessness predicate hook was introduced earlier and implemented
  for DCN32:
  - Hook declaration:
    drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h:410+
  - Implementation example:
    drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c (function
    dcn32_is_pipe_topology_transition_seamless)

Stability and regression risk
- Change is confined to the AMD DC commit path and only triggers when
  the hwss hook reports a non‑seamless transition.
- Uses an existing, widely used helper (commit_minimal_transition_state)
  that already has many refinements:
  - E.g., skipping forced ODM during minimal transition to keep it
    seamless (b04c21abe21ff), and generic non‑seamless detection and
    handling (d2dea1f140385, related v3 sequence work).
- No architectural changes; behavior mirrors already‑trusted logic in
  plane/stream update.
- Potential minor performance impact (an extra, minimal intermediate
  commit) only when necessary; functional correctness/glitch avoidance
  outweighs this.

Prerequisites and backport considerations
- Requires the hwss.is_pipe_topology_transition_seamless hook and its
  implementation (added by “drm/amd/display: add seamless pipe topology
  transition check”). Stable trees lacking this will need that
  prerequisite backported first.
- In some branches dc_validate_with_context signature differs:
  - In this tree it takes a `bool fast_validate`
    (drivers/gpu/drm/amd/display/dc/dc.h:1570-1574).
  - The patch snippet shows a newer enum mode
    (DC_VALIDATE_MODE_AND_PROGRAMMING). When backporting, keep using the
    existing boolean call pattern.
- commit_minimal_transition_state return type varies by branch (bool vs
  enum in the snippet). In this tree it returns bool
  (drivers/gpu/drm/amd/display/dc/core/dc.c:4551). Adapt the return
  check accordingly during backport.

Conclusion
- This is a targeted bug fix that prevents visible glitches and
  underflow by ensuring a seamless intermediate transition in
  dc_commit_streams. It aligns commit behavior with other DC update
  paths and is guarded by a capability hook. With prerequisites present,
  it is a strong candidate for stable backport.

 drivers/gpu/drm/amd/display/dc/core/dc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index bb189f6773397..bc364792d9d31 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2413,6 +2413,18 @@ enum dc_status dc_commit_streams(struct dc *dc, struct dc_commit_streams_params
 		goto fail;
 	}
 
+	/*
+	 * If not already seamless, make transition seamless by inserting intermediate minimal transition
+	 */
+	if (dc->hwss.is_pipe_topology_transition_seamless &&
+			!dc->hwss.is_pipe_topology_transition_seamless(dc, dc->current_state, context)) {
+		res = commit_minimal_transition_state(dc, context);
+		if (res != DC_OK) {
+			BREAK_TO_DEBUGGER();
+			goto fail;
+		}
+	}
+
 	res = dc_commit_state_no_check(dc, context);
 
 	for (i = 0; i < params->stream_count; i++) {
-- 
2.51.0[PATCH AUTOSEL 6.17-6.6] drm/amd/display: ensure committing streams is seamlessSasha Levin <sashal@kernel.org> undefinedpatches@lists.linux.dev, stable@vger.kernel.org undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined�D��'