backend/drm: introduce drm_connector_alloc_crtc
This function allocates a CRTC for a connector if necessary.
@@ -727,6 +727,19 @@ static void attempt_enable_needs_modeset(struct wlr_drm_backend *drm) {
}
}
+static bool drm_connector_alloc_crtc(struct wlr_drm_connector *conn) {
+ if (conn->crtc != NULL) {
+ return true;
+ }
+
+ bool prev_desired_enabled = conn->desired_enabled;
+ conn->desired_enabled = true;
+ realloc_crtcs(conn->backend);
+ conn->desired_enabled = prev_desired_enabled;
+
+ return conn->crtc != NULL;
+}
+
static bool drm_connector_set_mode(struct wlr_drm_connector *conn,
const struct wlr_output_state *state) {
struct wlr_drm_backend *drm = conn->backend;
@@ -763,11 +776,7 @@ static bool drm_connector_set_mode(struct wlr_drm_connector *conn,
return false;
}
- if (conn->crtc == NULL) {
- // Maybe we can steal a CRTC from a disabled output
- realloc_crtcs(drm);
- }
- if (conn->crtc == NULL) {
+ if (!drm_connector_alloc_crtc(conn)) {
wlr_drm_conn_log(conn, WLR_ERROR,
"Cannot perform modeset: no CRTC for this connector");
return false;
