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	backend/drm: fill scratch wlr_output_state for set_mode
Populate the wlr_output_state when setting a mode. This will allow drm_connector_set_mode to stop relying on ephemeral fields in wlr_drm_crtc. Also drm_connector_set_mode will be able to apply both a new buffer and a new mode atomically.
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					 2 changed files with 23 additions and 7 deletions
				
			
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					@ -118,12 +118,17 @@ static void handle_session_active(struct wl_listener *listener, void *data) {
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		struct wlr_drm_connector *conn;
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							struct wlr_drm_connector *conn;
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		wl_list_for_each(conn, &drm->outputs, link) {
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							wl_list_for_each(conn, &drm->outputs, link) {
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			struct wlr_output_state state = {0};
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								struct wlr_output_mode *mode = NULL;
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			if (conn->output.enabled && conn->output.current_mode != NULL) {
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								if (conn->output.enabled && conn->output.current_mode != NULL) {
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				drm_connector_set_mode(conn, &state, conn->output.current_mode);
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									mode = conn->output.current_mode;
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			} else {
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				drm_connector_set_mode(conn, &state, NULL);
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			}
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								}
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								struct wlr_output_state state = {
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									.committed = WLR_OUTPUT_STATE_MODE | WLR_OUTPUT_STATE_ENABLED,
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									.enabled = mode != NULL,
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									.mode_type = WLR_OUTPUT_STATE_MODE_FIXED,
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									.mode = mode,
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								};
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								drm_connector_set_mode(conn, &state, mode);
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		}
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							}
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	} else {
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						} else {
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		wlr_log(WLR_INFO, "DRM fd paused");
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							wlr_log(WLR_INFO, "DRM fd paused");
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					@ -735,7 +735,12 @@ static void attempt_enable_needs_modeset(struct wlr_drm_backend *drm) {
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				conn->desired_enabled) {
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									conn->desired_enabled) {
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			wlr_drm_conn_log(conn, WLR_DEBUG,
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								wlr_drm_conn_log(conn, WLR_DEBUG,
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				"Output has a desired mode and a CRTC, attempting a modeset");
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									"Output has a desired mode and a CRTC, attempting a modeset");
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			struct wlr_output_state state = {0};
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								struct wlr_output_state state = {
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									.committed = WLR_OUTPUT_STATE_MODE | WLR_OUTPUT_STATE_ENABLED,
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									.enabled = true,
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									.mode_type = WLR_OUTPUT_STATE_MODE_FIXED,
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									.mode = conn->desired_mode,
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								};
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			drm_connector_set_mode(conn, &state, conn->desired_mode);
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								drm_connector_set_mode(conn, &state, conn->desired_mode);
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		}
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							}
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	}
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						}
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					@ -1056,7 +1061,10 @@ static void dealloc_crtc(struct wlr_drm_connector *conn) {
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	conn->crtc->pending_modeset = true;
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						conn->crtc->pending_modeset = true;
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	conn->crtc->pending.active = false;
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						conn->crtc->pending.active = false;
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	struct wlr_output_state state = {0};
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						struct wlr_output_state state = {
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							.committed = WLR_OUTPUT_STATE_ENABLED,
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							.enabled = false,
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						};
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	if (!drm_crtc_commit(conn, &state, 0)) {
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						if (!drm_crtc_commit(conn, &state, 0)) {
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		// On GPU unplug, disabling the CRTC can fail with EPERM
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							// On GPU unplug, disabling the CRTC can fail with EPERM
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		wlr_drm_conn_log(conn, WLR_ERROR, "Failed to disable CRTC %"PRIu32,
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							wlr_drm_conn_log(conn, WLR_ERROR, "Failed to disable CRTC %"PRIu32,
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					@ -1185,7 +1193,10 @@ static void realloc_crtcs(struct wlr_drm_backend *drm) {
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		struct wlr_drm_mode *mode =
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							struct wlr_drm_mode *mode =
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			(struct wlr_drm_mode *)conn->output.current_mode;
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								(struct wlr_drm_mode *)conn->output.current_mode;
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		struct wlr_output_state state = {0};
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							struct wlr_output_state state = {
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								.committed = WLR_OUTPUT_STATE_ENABLED,
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								.enabled = true,
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							};
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		if (!drm_connector_init_renderer(conn, &state, mode)) {
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							if (!drm_connector_init_renderer(conn, &state, mode)) {
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			wlr_drm_conn_log(conn, WLR_ERROR, "Failed to initialize renderer");
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								wlr_drm_conn_log(conn, WLR_ERROR, "Failed to initialize renderer");
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			wlr_output_update_enabled(&conn->output, false);
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								wlr_output_update_enabled(&conn->output, false);
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