+/**
+ * drm_atomic_set_mode_for_crtc - set mode for CRTC
+ * @state: the CRTC whose incoming state to update
+ * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
+ *
+ * Set a mode (originating from the kernel) on the desired CRTC state. Does
+ * not change any other state properties, including enable, active, or
+ * mode_changed.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure. Cannot return -EDEADLK.
+ */
+int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
+ struct drm_display_mode *mode)
+{
+ struct drm_mode_modeinfo umode;
+
+ /* Early return for no change. */
+ if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
+ return 0;
+
+ if (state->mode_blob)
+ drm_property_unreference_blob(state->mode_blob);
+ state->mode_blob = NULL;
+
+ if (mode) {
+ drm_mode_convert_to_umode(&umode, mode);
+ state->mode_blob =
+ drm_property_create_blob(state->crtc->dev,
+ sizeof(umode),
+ &umode);
+ if (IS_ERR(state->mode_blob))
+ return PTR_ERR(state->mode_blob);
+
+ drm_mode_copy(&state->mode, mode);
+ state->enable = true;
+ DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
+ mode->name, state);
+ } else {
+ memset(&state->mode, 0, sizeof(state->mode));
+ state->enable = false;
+ DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
+ state);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
+
+/**
+ * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
+ * @state: the CRTC whose incoming state to update
+ * @blob: pointer to blob property to use for mode
+ *
+ * Set a mode (originating from a blob property) on the desired CRTC state.
+ * This function will take a reference on the blob property for the CRTC state,
+ * and release the reference held on the state's existing mode property, if any
+ * was set.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure. Cannot return -EDEADLK.
+ */
+int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
+ struct drm_property_blob *blob)
+{
+ if (blob == state->mode_blob)
+ return 0;
+
+ if (state->mode_blob)
+ drm_property_unreference_blob(state->mode_blob);
+ state->mode_blob = NULL;
+
+ if (blob) {
+ if (blob->length != sizeof(struct drm_mode_modeinfo) ||
+ drm_mode_convert_umode(&state->mode,
+ (const struct drm_mode_modeinfo *)
+ blob->data))
+ return -EINVAL;
+
+ state->mode_blob = drm_property_reference_blob(blob);
+ state->enable = true;
+ DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
+ state->mode.name, state);
+ } else {
+ memset(&state->mode, 0, sizeof(state->mode));
+ state->enable = false;
+ DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
+ state);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
+