[Intel-gfx] [PATCH 2/6] drm/i915/display/psr: Use plane damage clips to calculate damaged area

[José Roberto de Souza]

Now using plane damage clips property to calcualte the damaged area.
Selective fetch only supports one region to be fetched so software
needs to calculate a bounding box around all damage clips.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
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 | 54 +++++++++++++++++++++---
 1 file changed, 49 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 773a5b5fa078..0f1e9f0fa57f 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1273,6 +1273,9 @@ 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 *sel_fetch_area, temp;
+		struct drm_mode_rect *damaged_clips;
+		u32 num_clips;
+		int j;
 
 		if (new_plane_state->uapi.crtc != crtc_state->uapi.crtc)
 			continue;
@@ -1291,13 +1294,54 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 		if (!new_plane_state->uapi.visible)
 			continue;
 
+		sel_fetch_area = &new_plane_state->psr2_sel_fetch_area;
+		sel_fetch_area->y1 = -1;
+
+		damaged_clips = drm_plane_get_damage_clips(&new_plane_state->uapi);
+		num_clips = drm_plane_get_damage_clips_count(&new_plane_state->uapi);
+
 		/*
-		 * For now doing a selective fetch in the whole plane area,
-		 * optimizations will come in the future.
+		 * If plane moved, mark the whole plane area as damaged as it
+		 * needs to be complete redraw in the new position.
 		 */
-		sel_fetch_area = &new_plane_state->psr2_sel_fetch_area;
-		sel_fetch_area->y1 = new_plane_state->uapi.src.y1 >> 16;
-		sel_fetch_area->y2 = new_plane_state->uapi.src.y2 >> 16;
+		if (!drm_rect_equals(&new_plane_state->uapi.dst,
+				     &old_plane_state->uapi.dst)) {
+			num_clips = 0;
+			sel_fetch_area->y1 = new_plane_state->uapi.src.y1 >> 16;
+			sel_fetch_area->y2 = new_plane_state->uapi.src.y2 >> 16;
+		} else if (!num_clips && new_plane_state->uapi.fb !=
+			   old_plane_state->uapi.fb) {
+			/*
+			 * If the plane don't have damage areas but the
+			 * framebuffer changed, mark the whole plane area as
+			 * damaged.
+			 */
+			sel_fetch_area->y1 = new_plane_state->uapi.src.y1 >> 16;
+			sel_fetch_area->y2 = new_plane_state->uapi.src.y2 >> 16;
+		}
+
+		for (j = 0; j < num_clips; j++) {
+			struct drm_rect damage_area;
+
+			damage_area.y1 = damaged_clips[j].y1;
+			damage_area.y2 = damaged_clips[j].y2;
+			clip_area_update(sel_fetch_area, &damage_area);
+		}
+
+		/*
+		 * No page flip, no plane moviment or no damage areas, so don't
+		 * fetch any pixel from memory for this plane
+		 */
+		if (sel_fetch_area->y1 == -1) {
+			sel_fetch_area->y1 = 0;
+			sel_fetch_area->y2 = 0;
+		}
+
+		/* Don't need to redraw plane damaged areas outside of screen */
+		j = sel_fetch_area->y2 + (new_plane_state->uapi.dst.y1 >> 16);
+		j = crtc_state->uapi.adjusted_mode.crtc_vdisplay - j;
+		if (j < 0)
+			sel_fetch_area->y2 += j;
 
 		temp = *sel_fetch_area;
 		temp.y1 += new_plane_state->uapi.dst.y1 >> 16;
-- 
2.28.0