[PATCH v3 3/3] drm/i915: Ensure damage clip area is within pipe area

["Jouni Högander" <jouni.hogander@intel.com>]

Current update area calculation is not handling situation where
e.g. cursor plane is fully or partially outside pipe area.

Fix this by checking damage area against pipe_src area using
drm_rect_intersect.

v2: Set x1 and x2 in damaged_area initialization
v3: Move drm_rect_intersect into clip_area_update

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5440
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Mark Pearson <markpearson@lenovo.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 3561c218cfb1..f4b4c1c83d2b 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1618,8 +1618,12 @@ static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
 }
 
 static void clip_area_update(struct drm_rect *overlap_damage_area,
-			     struct drm_rect *damage_area)
+			     struct drm_rect *damage_area,
+			     struct drm_rect *draw_area)
 {
+	if (!drm_rect_intersect(damage_area, draw_area))
+		return;
+
 	if (overlap_damage_area->y1 == -1) {
 		overlap_damage_area->y1 = damage_area->y1;
 		overlap_damage_area->y2 = damage_area->y2;
@@ -1709,7 +1713,8 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 	 */
 	for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
 					     new_plane_state, i) {
-		struct drm_rect src, damaged_area = { .y1 = -1 };
+		struct drm_rect src, damaged_area = { .x1 = 0, .y1 = -1,
+						      .x2 = INT_MAX };
 		struct drm_atomic_helper_damage_iter iter;
 		struct drm_rect clip;
 
@@ -1736,20 +1741,23 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 			if (old_plane_state->uapi.visible) {
 				damaged_area.y1 = old_plane_state->uapi.dst.y1;
 				damaged_area.y2 = old_plane_state->uapi.dst.y2;
-				clip_area_update(&pipe_clip, &damaged_area);
+				clip_area_update(&pipe_clip, &damaged_area,
+						 &crtc_state->pipe_src);
 			}
 
 			if (new_plane_state->uapi.visible) {
 				damaged_area.y1 = new_plane_state->uapi.dst.y1;
 				damaged_area.y2 = new_plane_state->uapi.dst.y2;
-				clip_area_update(&pipe_clip, &damaged_area);
+				clip_area_update(&pipe_clip, &damaged_area,
+						 &crtc_state->pipe_src);
 			}
 			continue;
 		} else if (new_plane_state->uapi.alpha != old_plane_state->uapi.alpha) {
 			/* If alpha changed mark the whole plane area as damaged */
 			damaged_area.y1 = new_plane_state->uapi.dst.y1;
 			damaged_area.y2 = new_plane_state->uapi.dst.y2;
-			clip_area_update(&pipe_clip, &damaged_area);
+			clip_area_update(&pipe_clip, &damaged_area,
+					 &crtc_state->pipe_src);
 			continue;
 		}
 
@@ -1760,7 +1768,8 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 						   &new_plane_state->uapi);
 		drm_atomic_for_each_plane_damage(&iter, &clip) {
 			if (drm_rect_intersect(&clip, &src))
-				clip_area_update(&damaged_area, &clip);
+				clip_area_update(&damaged_area, &clip,
+						 &crtc_state->pipe_src);
 		}
 
 		if (damaged_area.y1 == -1)
@@ -1768,7 +1777,8 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 
 		damaged_area.y1 += new_plane_state->uapi.dst.y1 - src.y1;
 		damaged_area.y2 += new_plane_state->uapi.dst.y1 - src.y1;
-		clip_area_update(&pipe_clip, &damaged_area);
+
+		clip_area_update(&pipe_clip, &damaged_area, &crtc_state->pipe_src);
 	}
 
 	/*
-- 
2.25.1