drm/i915/display/psr: Calculate selective fetch plane registers

Add the calculations to set plane selective fetch registers depending
in the value of the area damaged.
It is still using the whole plane area as damaged but that will change
in next patches.

v2:
- fixed new_plane_state->uapi.dst.y2 typo in
intel_psr2_sel_fetch_update()
- do not shifthing new_plane_state->uapi.dst only src is in 16.16 format

BSpec: 55229
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Tested-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201130125750.17820-1-jose.souza@intel.com

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -604,6 +604,8 @@ struct intel_plane_state {
 	u32 planar_slave;
 
 	struct drm_intel_sprite_colorkey ckey;
+
+	struct drm_rect psr2_sel_fetch_area;
 };
 
 struct intel_initial_plane_config {

drivers/gpu/drm/i915/display/intel_psr.c

@@ -1185,6 +1185,7 @@ void intel_psr2_program_plane_sel_fetch(struct intel_plane *plane,
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	enum pipe pipe = plane->pipe;
+	const struct drm_rect *clip;
 	u32 val;
 
 	if (!crtc_state->enable_psr2_sel_fetch)
@@ -1196,16 +1197,20 @@ void intel_psr2_program_plane_sel_fetch(struct intel_plane *plane,
 	if (!val || plane->id == PLANE_CURSOR)
 		return;
 
-	val = plane_state->uapi.dst.y1 << 16 | plane_state->uapi.dst.x1;
+	clip = &plane_state->psr2_sel_fetch_area;
+
+	val = (clip->y1 + plane_state->uapi.dst.y1) << 16;
+	val |= plane_state->uapi.dst.x1;
 	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_POS(pipe, plane->id), val);
 
-	val = plane_state->color_plane[color_plane].y << 16;
+	/* TODO: consider tiling and auxiliary surfaces */
+	val = (clip->y1 + plane_state->color_plane[color_plane].y) << 16;
 	val |= plane_state->color_plane[color_plane].x;
 	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_OFFSET(pipe, plane->id),
 			  val);
 
 	/* Sizes are 0 based */
-	val = ((drm_rect_height(&plane_state->uapi.src) >> 16) - 1) << 16;
+	val = (drm_rect_height(clip) - 1) << 16;
 	val |= (drm_rect_width(&plane_state->uapi.src) >> 16) - 1;
 	intel_de_write_fw(dev_priv, PLANE_SEL_FETCH_SIZE(pipe, plane->id), val);
 }
@@ -1279,7 +1284,7 @@ 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 temp;
+		struct drm_rect *sel_fetch_area, temp;
 
 		if (new_plane_state->uapi.crtc != crtc_state->uapi.crtc)
 			continue;
@@ -1302,8 +1307,13 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
 		 * For now doing a selective fetch in the whole plane area,
 		 * optimizations will come in the future.
 		 */
-		temp.y1 = new_plane_state->uapi.dst.y1;
-		temp.y2 = new_plane_state->uapi.dst.y2;
+		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;
+
+		temp = *sel_fetch_area;
+		temp.y1 += new_plane_state->uapi.dst.y1;
+		temp.y2 += new_plane_state->uapi.dst.y2;
 		clip_area_update(&pipe_clip, &temp);
 	}