drm/atomic-helper: Implement drm_atomic_helper_duplicate_state()
This function can be used to duplicate an atomic state object. This is useful for example to implement suspend/resume, where the state before suspend can be saved and restored upon resume. v2: move locking to caller, be more explicit about prerequisites v3: explicitly pass lock acquisition context, improve kerneldoc Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -2371,6 +2371,84 @@ drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
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}
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EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
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/**
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* drm_atomic_helper_duplicate_state - duplicate an atomic state object
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* @dev: DRM device
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* @ctx: lock acquisition context
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*
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* Makes a copy of the current atomic state by looping over all objects and
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* duplicating their respective states.
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*
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* Note that this treats atomic state as persistent between save and restore.
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* Drivers must make sure that this is possible and won't result in confusion
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* or erroneous behaviour.
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*
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* Note that if callers haven't already acquired all modeset locks this might
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* return -EDEADLK, which must be handled by calling drm_modeset_backoff().
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*
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* Returns:
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* A pointer to the copy of the atomic state object on success or an
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* ERR_PTR()-encoded error code on failure.
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*/
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struct drm_atomic_state *
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drm_atomic_helper_duplicate_state(struct drm_device *dev,
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struct drm_modeset_acquire_ctx *ctx)
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{
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struct drm_atomic_state *state;
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struct drm_connector *conn;
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struct drm_plane *plane;
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struct drm_crtc *crtc;
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int err = 0;
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state = drm_atomic_state_alloc(dev);
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if (!state)
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return ERR_PTR(-ENOMEM);
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state->acquire_ctx = ctx;
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drm_for_each_crtc(crtc, dev) {
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struct drm_crtc_state *crtc_state;
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crtc_state = drm_atomic_get_crtc_state(state, crtc);
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if (IS_ERR(crtc_state)) {
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err = PTR_ERR(crtc_state);
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goto free;
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}
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}
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drm_for_each_plane(plane, dev) {
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struct drm_plane_state *plane_state;
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plane_state = drm_atomic_get_plane_state(state, plane);
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if (IS_ERR(plane_state)) {
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err = PTR_ERR(plane_state);
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goto free;
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}
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}
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drm_for_each_connector(conn, dev) {
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struct drm_connector_state *conn_state;
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conn_state = drm_atomic_get_connector_state(state, conn);
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if (IS_ERR(conn_state)) {
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err = PTR_ERR(conn_state);
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goto free;
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}
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}
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/* clear the acquire context so that it isn't accidentally reused */
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state->acquire_ctx = NULL;
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free:
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if (err < 0) {
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drm_atomic_state_free(state);
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state = ERR_PTR(err);
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}
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return state;
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}
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EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
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/**
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* __drm_atomic_helper_connector_destroy_state - release connector state
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* @connector: connector object
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@ -118,6 +118,9 @@ __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
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struct drm_connector_state *state);
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struct drm_connector_state *
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drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
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struct drm_atomic_state *
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drm_atomic_helper_duplicate_state(struct drm_device *dev,
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struct drm_modeset_acquire_ctx *ctx);
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void
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__drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
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struct drm_connector_state *state);
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