drm/i915: Ensure damage clip area is within pipe area

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
v4: draw_area -> pipe_src

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>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220513142811.779331-3-jouni.hogander@intel.com

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 *pipe_src)
 {
+	if (!drm_rect_intersect(damage_area, pipe_src))
+		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 +1777,7 @@ 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);
 	}
 
 	/*