backend/drm: make adaptive_sync atomic

Stop using drmModeObjectSetProperty, set the property in the crtc_commit
function instead.

backend/drm/atomic.c

@@ -196,6 +196,14 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
 		}
 	}
 
+	bool prev_vrr_enabled =
+		output->adaptive_sync_status == WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED;
+	bool vrr_enabled = prev_vrr_enabled;
+	if ((output->pending.committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED) &&
+			drm_connector_supports_vrr(conn)) {
+		vrr_enabled = output->pending.adaptive_sync_enabled;
+	}
+
 	if (crtc->pending_modeset) {
 		flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
 	} else {
@@ -217,6 +225,9 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
 		if (crtc->props.gamma_lut != 0) {
 			atomic_add(&atom, crtc->id, crtc->props.gamma_lut, gamma_lut);
 		}
+		if (crtc->props.vrr_enabled != 0) {
+			atomic_add(&atom, crtc->id, crtc->props.vrr_enabled, vrr_enabled);
+		}
 		set_plane_props(&atom, drm, crtc->primary, crtc->id, 0, 0);
 		if (crtc->cursor) {
 			if (drm_connector_is_cursor_visible(conn)) {
@@ -239,6 +250,14 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
 	if (ok && !(flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
 		commit_blob(drm, &crtc->mode_id, mode_id);
 		commit_blob(drm, &crtc->gamma_lut, gamma_lut);
+
+		if (vrr_enabled != prev_vrr_enabled) {
+			output->adaptive_sync_status = vrr_enabled ?
+				WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED :
+				WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
+			wlr_log(WLR_DEBUG, "VRR %s on connector '%s'",
+				vrr_enabled ? "enabled" : "disabled", output->name);
+		}
 	} else {
 		rollback_blob(drm, &crtc->mode_id, mode_id);
 		rollback_blob(drm, &crtc->gamma_lut, gamma_lut);

backend/drm/drm.c

@@ -502,14 +502,13 @@ static bool drm_connector_commit_buffer(struct wlr_output *output) {
 	return true;
 }
 
-static void drm_connector_enable_adaptive_sync(struct wlr_output *output,
-		bool enabled) {
-	struct wlr_drm_connector *conn = get_drm_connector_from_output(output);
-	struct wlr_drm_backend *drm = get_drm_backend_from_backend(output->backend);
+bool drm_connector_supports_vrr(struct wlr_drm_connector *conn) {
+	struct wlr_drm_backend *drm =
+		get_drm_backend_from_backend(conn->output.backend);
 
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	if (!crtc) {
-		return;
+		return false;
 	}
 
 	uint64_t vrr_capable;
@@ -517,26 +516,17 @@ static void drm_connector_enable_adaptive_sync(struct wlr_output *output,
 			!get_drm_prop(drm->fd, conn->id, conn->props.vrr_capable,
 			&vrr_capable) || !vrr_capable) {
 		wlr_log(WLR_DEBUG, "Failed to enable adaptive sync: "
-			"connector '%s' doesn't support VRR", output->name);
-		return;
+			"connector '%s' doesn't support VRR", conn->output.name);
+		return false;
 	}
 
 	if (crtc->props.vrr_enabled == 0) {
 		wlr_log(WLR_DEBUG, "Failed to enable adaptive sync: "
 			"CRTC %"PRIu32" doesn't support VRR", crtc->id);
-		return;
-	}
-
-	if (drmModeObjectSetProperty(drm->fd, crtc->id, DRM_MODE_OBJECT_CRTC,
-			crtc->props.vrr_enabled, enabled) != 0) {
-		wlr_log_errno(WLR_ERROR, "drmModeObjectSetProperty(VRR_ENABLED) failed");
-		return;
+		return false;
 	}
 
-	output->adaptive_sync_status = enabled ? WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED :
-		WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
-	wlr_log(WLR_DEBUG, "VRR %s on connector '%s'",
-		enabled ? "enabled" : "disabled", output->name);
+	return true;
 }
 
 static bool drm_connector_commit(struct wlr_output *output) {
@@ -574,11 +564,6 @@ static bool drm_connector_commit(struct wlr_output *output) {
 		}
 	}
 
-	if (output->pending.committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED) {
-		drm_connector_enable_adaptive_sync(output,
-			output->pending.adaptive_sync_enabled);
-	}
-
 	// TODO: support modesetting with a buffer
 	if (output->pending.committed & WLR_OUTPUT_STATE_BUFFER &&
 			!(output->pending.committed & WLR_OUTPUT_STATE_MODE)) {

backend/drm/legacy.c

@@ -62,6 +62,23 @@ static bool legacy_crtc_commit(struct wlr_drm_backend *drm,
 		}
 	}
 
+	if ((output->pending.committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED) &&
+			drm_connector_supports_vrr(conn)) {
+		if (drmModeObjectSetProperty(drm->fd, crtc->id, DRM_MODE_OBJECT_CRTC,
+				crtc->props.vrr_enabled,
+				output->pending.adaptive_sync_enabled) != 0) {
+			wlr_log_errno(WLR_ERROR,
+				"drmModeObjectSetProperty(VRR_ENABLED) failed");
+			return false;
+		}
+		output->adaptive_sync_status = output->pending.adaptive_sync_enabled ?
+			WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED :
+			WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
+		wlr_log(WLR_DEBUG, "VRR %s on connector '%s'",
+			output->pending.adaptive_sync_enabled ? "enabled" : "disabled",
+			output->name);
+	}
+
 	if (cursor != NULL && drm_connector_is_cursor_visible(conn)) {
 		struct wlr_drm_fb *cursor_fb = plane_get_next_fb(cursor);
 		struct gbm_bo *cursor_bo =

include/backend/drm/drm.h

@@ -153,6 +153,7 @@ int handle_drm_event(int fd, uint32_t mask, void *data);
 bool drm_connector_set_mode(struct wlr_drm_connector *conn,
 	struct wlr_output_mode *mode);
 bool drm_connector_is_cursor_visible(struct wlr_drm_connector *conn);
+bool drm_connector_supports_vrr(struct wlr_drm_connector *conn);
 size_t drm_crtc_get_gamma_lut_size(struct wlr_drm_backend *drm,
 	struct wlr_drm_crtc *crtc);