backend/drm: fallback to drmModeAddFB2

backend/drm/atomic.c

@@ -172,7 +172,8 @@ static bool atomic_crtc_set_cursor(struct wlr_drm_backend *drm,
 	atomic_begin(crtc, &atom);
 
 	if (bo) {
-		uint32_t fb_id = get_fb_for_bo(bo, plane->drm_format);
+		uint32_t fb_id =
+			get_fb_for_bo(bo, plane->drm_format, drm->addfb2_modifiers);
 		set_plane_props(&atom, plane, crtc->id, fb_id, false);
 	} else {
 		atomic_add(&atom, plane->id, plane->props.fb_id, 0);

backend/drm/drm.c

@@ -66,6 +66,9 @@ bool check_drm_features(struct wlr_drm_backend *drm) {
 	int ret = drmGetCap(drm->fd, DRM_CAP_TIMESTAMP_MONOTONIC, &cap);
 	drm->clock = (ret == 0 && cap == 1) ? CLOCK_MONOTONIC : CLOCK_REALTIME;
 
+	ret = drmGetCap(drm->fd, DRM_CAP_ADDFB2_MODIFIERS, &cap);
+	drm->addfb2_modifiers = ret == 0 && cap == 1;
+
 	return true;
 }
 
@@ -319,7 +322,7 @@ static bool drm_connector_commit(struct wlr_output *output) {
 				return false;
 			}
 		}
-		fb_id = get_fb_for_bo(bo, plane->drm_format);
+		fb_id = get_fb_for_bo(bo, plane->drm_format, drm->addfb2_modifiers);
 		if (fb_id == 0) {
 			wlr_log(WLR_ERROR, "get_fb_for_bo failed");
 			return false;
@@ -332,7 +335,7 @@ static bool drm_connector_commit(struct wlr_output *output) {
 			return false;
 		}
 
-		fb_id = get_fb_for_bo(bo, gbm_bo_get_format(bo));
+		fb_id = get_fb_for_bo(bo, gbm_bo_get_format(bo), drm->addfb2_modifiers);
 		if (fb_id == 0) {
 			wlr_log(WLR_ERROR, "get_fb_for_bo failed");
 			return false;
@@ -462,7 +465,7 @@ static void drm_connector_start_renderer(struct wlr_drm_connector *conn) {
 
 	struct gbm_bo *bo = get_drm_surface_front(
 		drm->parent ? &plane->mgpu_surf : &plane->surf);
-	uint32_t fb_id = get_fb_for_bo(bo, plane->drm_format);
+	uint32_t fb_id = get_fb_for_bo(bo, plane->drm_format, drm->addfb2_modifiers);
 
 	struct wlr_drm_mode *mode = (struct wlr_drm_mode *)conn->output.current_mode;
 	if (drm->iface->crtc_pageflip(drm, conn, crtc, fb_id, &mode->drm_mode)) {
@@ -887,7 +890,7 @@ static bool drm_connector_schedule_frame(struct wlr_output *output) {
 		return true;
 	}
 
-	uint32_t fb_id = get_fb_for_bo(bo, plane->drm_format);
+	uint32_t fb_id = get_fb_for_bo(bo, plane->drm_format, drm->addfb2_modifiers);
 	if (!drm->iface->crtc_pageflip(drm, conn, crtc, fb_id, NULL)) {
 		return false;
 	}

backend/drm/util.c

@@ -178,7 +178,8 @@ static void free_fb(struct gbm_bo *bo, void *data) {
 	}
 }
 
-uint32_t get_fb_for_bo(struct gbm_bo *bo, uint32_t drm_format) {
+uint32_t get_fb_for_bo(struct gbm_bo *bo, uint32_t drm_format,
+		bool with_modifiers) {
 	uint32_t id = (uintptr_t)gbm_bo_get_user_data(bo);
 	if (id) {
 		return id;
@@ -192,11 +193,18 @@ uint32_t get_fb_for_bo(struct gbm_bo *bo, uint32_t drm_format) {
 	uint32_t handles[4] = {gbm_bo_get_handle(bo).u32};
 	uint32_t strides[4] = {gbm_bo_get_stride(bo)};
 	uint32_t offsets[4] = {gbm_bo_get_offset(bo, 0)};
-	uint64_t modifiers[4] = {gbm_bo_get_modifier(bo)};
 
-	if (drmModeAddFB2WithModifiers(fd, width, height, drm_format,
-			handles, strides, offsets, modifiers, &id, DRM_MODE_FB_MODIFIERS)) {
-		wlr_log_errno(WLR_ERROR, "Unable to add DRM framebuffer");
+	if (with_modifiers && gbm_bo_get_modifier(bo) != DRM_FORMAT_MOD_INVALID) {
+		uint64_t modifiers[4] = {gbm_bo_get_modifier(bo)};
+		if (drmModeAddFB2WithModifiers(fd, width, height, drm_format, handles,
+				strides, offsets, modifiers, &id, DRM_MODE_FB_MODIFIERS)) {
+			wlr_log_errno(WLR_ERROR, "Unable to add DRM framebuffer");
+		}
+	} else {
+		if (drmModeAddFB2(fd, width, height, drm_format, handles, strides,
+				offsets, &id, 0)) {
+			wlr_log_errno(WLR_ERROR, "Unable to add DRM framebuffer");
+		}
 	}
 
 	gbm_bo_set_user_data(bo, (void *)(uintptr_t)id, free_fb);

include/backend/drm/drm.h

@@ -72,6 +72,7 @@ struct wlr_drm_backend {
 	struct wlr_drm_backend *parent;
 	const struct wlr_drm_interface *iface;
 	clockid_t clock;
+	bool addfb2_modifiers;
 
 	int fd;
 

include/backend/drm/util.h

@@ -14,7 +14,8 @@ void parse_edid(struct wlr_output *restrict output, size_t len,
 // Returns the string representation of a DRM output type
 const char *conn_get_name(uint32_t type_id);
 // Returns the DRM framebuffer id for a gbm_bo
-uint32_t get_fb_for_bo(struct gbm_bo *bo, uint32_t drm_format);
+uint32_t get_fb_for_bo(struct gbm_bo *bo, uint32_t drm_format,
+	bool with_modifiers);
 
 // Part of match_obj
 enum {