drm/virtio: add plane check

Use drm_atomic_helper_check_plane_state()
to sanity check the plane state.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Chia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190822094657.27483-1-kraxel@redhat.com

diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index a492ac3..fe5efb2 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -84,7 +84,22 @@ static const struct drm_plane_funcs virtio_gpu_plane_funcs = {
 static int virtio_gpu_plane_atomic_check(struct drm_plane *plane,
                                         struct drm_plane_state *state)
 {
-       return 0;
+       bool is_cursor = plane->type == DRM_PLANE_TYPE_CURSOR;
+       struct drm_crtc_state *crtc_state;
+       int ret;
+
+       if (!state->fb || !state->crtc)
+               return 0;
+
+       crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
+       if (IS_ERR(crtc_state))
+                return PTR_ERR(crtc_state);
+
+       ret = drm_atomic_helper_check_plane_state(state, crtc_state,
+                                                 DRM_PLANE_HELPER_NO_SCALING,
+                                                 DRM_PLANE_HELPER_NO_SCALING,
+                                                 is_cursor, true);
+       return ret;
 }
 
 static void virtio_gpu_primary_plane_update(struct drm_plane *plane,