drm/i915: Copy the plane hw state directly for Y planes

When doing the plane state copy from the UV plane to the Y plane
let's just copy the hw state directly instead of using the original
uapi state. The UV plane has already had its uapi state copied into
its hw state, so this extra detour via the uapi state for the Y plane
is pointless.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201117194718.11462-2-manasi.d.navare@intel.com

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

@@ -265,6 +265,18 @@ void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
 	plane_state->hw.scaling_filter = from_plane_state->uapi.scaling_filter;
 }
 
+void intel_plane_copy_hw_state(struct intel_plane_state *plane_state,
+			       const struct intel_plane_state *from_plane_state)
+{
+	intel_plane_clear_hw_state(plane_state);
+
+	memcpy(&plane_state->hw, &from_plane_state->hw,
+	       sizeof(plane_state->hw));
+
+	if (plane_state->hw.fb)
+		drm_framebuffer_get(plane_state->hw.fb);
+}
+
 void intel_plane_set_invisible(struct intel_crtc_state *crtc_state,
 			       struct intel_plane_state *plane_state)
 {

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

@@ -25,6 +25,8 @@ unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
 				   const struct intel_plane_state *plane_state);
 void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
 				       const struct intel_plane_state *from_plane_state);
+void intel_plane_copy_hw_state(struct intel_plane_state *plane_state,
+			       const struct intel_plane_state *from_plane_state);
 void intel_update_plane(struct intel_plane *plane,
 			const struct intel_crtc_state *crtc_state,
 			const struct intel_plane_state *plane_state);

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

@@ -12792,7 +12792,7 @@ static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
 		memcpy(linked_state->color_plane, plane_state->color_plane,
 		       sizeof(linked_state->color_plane));
 
-		intel_plane_copy_uapi_to_hw_state(linked_state, plane_state);
+		intel_plane_copy_hw_state(linked_state, plane_state);
 		linked_state->uapi.src = plane_state->uapi.src;
 		linked_state->uapi.dst = plane_state->uapi.dst;