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Diffstat (limited to 'drivers/gpu/drm/drm_plane_helper.c')
-rw-r--r-- | drivers/gpu/drm/drm_plane_helper.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index c7785967f5bf..db04d9a32ce8 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -278,3 +278,33 @@ void drm_plane_helper_destroy(struct drm_plane *plane) kfree(plane); } EXPORT_SYMBOL(drm_plane_helper_destroy); + +/** + * drm_plane_helper_atomic_check() - Helper to check plane atomic-state + * @plane: plane to check + * @state: atomic state object + * + * Provides a default plane-state check handler for planes whose atomic-state + * scale and positioning are not expected to change since the plane is always + * a fullscreen scanout buffer. + * + * This is often the case for the primary plane of simple framebuffers. + * + * RETURNS: + * Zero on success, or an errno code otherwise. + */ +int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state) +{ + struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane); + struct drm_crtc *new_crtc = new_plane_state->crtc; + struct drm_crtc_state *new_crtc_state = NULL; + + if (new_crtc) + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc); + + return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state, + DRM_PLANE_NO_SCALING, + DRM_PLANE_NO_SCALING, + false, false); +} +EXPORT_SYMBOL(drm_plane_helper_atomic_check); |