From: Thierry Reding <tred...@nvidia.com>
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.
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
drivers/gpu/drm/drm_atomic_helper.c | 90 +++++++++++++++++++++++++++++++++++++
include/drm/drm_atomic_helper.h | 2 +
2 files changed, 92 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c
b/drivers/gpu/drm/drm_atomic_helper.c
index fd06595c2ee5..f842499ca79e 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2358,6 +2358,96 @@ drm_atomic_helper_connector_duplicate_state(struct
drm_connector *connector)
EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
/**
+ * drm_atomic_helper_duplicate_state - duplicate an atomic state object
+ * @dev: DRM device
+ *
+ * Makes a copy of the current atomic state by looping over all objects and
+ * duplicating their respective states.
+ *
+ * Returns: A pointer to the copy of the atomic state object on success or an
+ * ERR_PTR()-encoded error code on failure.
+ */
+struct drm_atomic_state *
+drm_atomic_helper_duplicate_state(struct drm_device *dev)
+{
+ struct drm_modeset_acquire_ctx ctx;
+ struct drm_atomic_state *state;
+ struct drm_connector *conn;
+ struct drm_plane *plane;
+ struct drm_crtc *crtc;
+ int err;
+
+ state = drm_atomic_state_alloc(dev);
+ if (!state)
+ return ERR_PTR(-ENOMEM);
+
+ drm_modeset_acquire_init(&ctx, 0);
+ state->acquire_ctx = &ctx;
+
+ err = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
+ if (err < 0)
+ goto free;
+
+ drm_for_each_crtc(crtc, dev) {
+ unsigned int index = drm_crtc_index(crtc);
+ struct drm_crtc_state *crtc_state;
+
+ crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
+ if (!crtc_state) {
+ err = -ENOMEM;
+ goto unlock;
+ }
+
+ state->crtc_states[index] = crtc_state;
+ state->crtcs[index] = crtc;
+ crtc_state->state = state;
+ }
+
+ drm_for_each_plane(plane, dev) {
+ unsigned int index = drm_plane_index(plane);
+ struct drm_plane_state *plane_state;
+
+ plane_state = plane->funcs->atomic_duplicate_state(plane);
+ if (!plane_state) {
+ err = -ENOMEM;
+ goto unlock;
+ }
+
+ state->plane_states[index] = plane_state;
+ state->planes[index] = plane;
+ plane_state->state = state;
+ }
+
+ drm_for_each_connector(conn, dev) {
+ unsigned int index = drm_connector_index(conn);
+ struct drm_connector_state *conn_state;
+
+ conn_state = conn->funcs->atomic_duplicate_state(conn);
+ if (!conn_state) {
+ err = -ENOMEM;
+ goto unlock;
+ }
+
+ state->connector_states[index] = conn_state;
+ state->connectors[index] = conn;
+ conn_state->state = state;
+ }
+
+unlock:
+ drm_modeset_drop_locks(&ctx);
+free:
+ drm_modeset_acquire_fini(&ctx);
+
+ if (err < 0) {
+ drm_atomic_state_free(state);
+ state = ERR_PTR(err);
+ }
+
+ return state;
+}
+EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
+
+/**
* __drm_atomic_helper_connector_destroy_state - release connector state
* @connector: connector object
* @state: connector state object to release
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 4ffe9dca07c4..5d27612997ce 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -118,6 +118,8 @@ __drm_atomic_helper_connector_duplicate_state(struct
drm_connector *connector,
struct drm_connector_state *state);
struct drm_connector_state *
drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
+struct drm_atomic_state *
+drm_atomic_helper_duplicate_state(struct drm_device *dev);
void
__drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
struct drm_connector_state *state);
--
2.4.5
