[Intel-gfx] [PATCH 5/5] drm/i915/display: Workaround cursor left overs with PSR2 selective fetch enabled

[José Roberto de Souza]

Not sure why but when moving the cursor fast it causes some artifacts
of the cursor to be left in the cursor path, adding some pixels above
the cursor to the damaged area fixes the issue, so leaving this as a
workaround until proper fix is found.

This is reproducile on TGL and ADL-P.

Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 25 ++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 670b0ceba110f..18e721dde22e2 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1565,6 +1565,28 @@ static void intel_psr2_sel_fetch_pipe_alignment(const struct intel_crtc_state *c
 		drm_warn(&dev_priv->drm, "Missing PSR2 sel fetch alignment with DSC\n");
 }
 
+/*
+ * FIXME: Not sure why but when moving the cursor fast it causes some artifacts
+ * of the cursor to be left in the cursor path, adding some pixels above the
+ * cursor to the damaged area fixes the issue.
+ */
+static void cursor_area_workaround(const struct intel_plane_state *new_plane_state,
+				   struct drm_rect *damaged_area,
+				   struct drm_rect *pipe_clip)
+{
+	const struct intel_plane *plane = to_intel_plane(new_plane_state->uapi.plane);
+	int height;
+
+	if (plane->id != PLANE_CURSOR)
+		return;
+
+	height = drm_rect_height(&new_plane_state->uapi.dst) / 2;
+	damaged_area->y1 -=  height;
+	damaged_area->y1 = max(damaged_area->y1, 0);
+
+	clip_area_update(pipe_clip, damaged_area);
+}
+
 int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 				struct intel_crtc *crtc)
 {
@@ -1627,6 +1649,9 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 				damaged_area.y2 = new_plane_state->uapi.dst.y2;
 				clip_area_update(&pipe_clip, &damaged_area);
 			}
+
+			cursor_area_workaround(new_plane_state, &damaged_area,
+					       &pipe_clip);
 			continue;
 		} else if (new_plane_state->uapi.alpha != old_plane_state->uapi.alpha) {
 			/* If alpha changed mark the whole plane area as damaged */
-- 
2.33.0