drm/i915/display: On Xe2 always enable decompression with tile4

With Xe2 always treat tile4 as if it was using flat ccs.
Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240202150602.430036-2-juhapekka.heikkila@gmail.com

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

@@ -948,6 +948,11 @@ static u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
 	if (DISPLAY_VER(dev_priv) == 13)
 		plane_ctl |= adlp_plane_ctl_arb_slots(plane_state);
 
+	if (GRAPHICS_VER(dev_priv) >= 20 &&
+	    fb->modifier == I915_FORMAT_MOD_4_TILED) {
+		plane_ctl |= PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
+	}
+
 	return plane_ctl;
 }