drm/udl: Use offset-adjusted shadow-plane mapping

For framebuffers with non-zero offset fields, shadow-plane helpers
provide a pointer to the first byte of the contained data. Use it in
udl.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210803125928.27780-10-tzimmermann@suse.de

drivers/gpu/drm/udl/udl_modeset.c

@@ -379,7 +379,7 @@ udl_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	udl->mode_buf_len = wrptr - buf;
 
-	udl_handle_damage(fb, &shadow_plane_state->map[0], 0, 0, fb->width, fb->height);
+	udl_handle_damage(fb, &shadow_plane_state->data[0], 0, 0, fb->width, fb->height);
 
 	if (!crtc_state->mode_changed)
 		return;
@@ -422,7 +422,7 @@ udl_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
 		return;
 
 	if (drm_atomic_helper_damage_merged(old_plane_state, state, &rect))
-		udl_handle_damage(fb, &shadow_plane_state->map[0], rect.x1, rect.y1,
+		udl_handle_damage(fb, &shadow_plane_state->data[0], rect.x1, rect.y1,
 				  rect.x2 - rect.x1, rect.y2 - rect.y1);
 }