compositor-drm: don't keep trying if hw doesn't support cursors

Not all hw supports hw cursors.  Similar to the case with sprites, if
the driver does not support it, don't keep trying and spamming the log
with error messages.

Signed-off-by: Rob Clark <rob@ti.com>

src/compositor-drm.c

@@ -99,6 +99,8 @@ struct drm_compositor {
 	struct wl_list sprite_list;
 	int sprites_are_broken;
 
+	int cursors_are_broken;
+
 	uint32_t prev_state;
 };
 
@@ -736,6 +738,8 @@ drm_output_prepare_cursor_surface(struct weston_output *output_base,
 		return NULL;
 	if (es->output_mask != (1u << output_base->id))
 		return NULL;
+	if (c->cursors_are_broken)
+		return;
 	if (es->buffer == NULL || !wl_buffer_is_shm(es->buffer) ||
 	    es->geometry.width > 64 || es->geometry.height > 64)
 		return NULL;
@@ -780,15 +784,20 @@ drm_output_set_cursor(struct drm_output *output)
 
 		handle = gbm_bo_get_handle(bo).s32;
 		if (drmModeSetCursor(c->drm.fd,
-				     output->crtc_id, handle, 64, 64))
+				     output->crtc_id, handle, 64, 64)) {
 			weston_log("failed to set cursor: %m\n");
+			c->cursors_are_broken = 1;
+		}
 	}
 
 	x = es->geometry.x - output->base.x;
 	y = es->geometry.y - output->base.y;
 	if (output->cursor_plane.x != x || output->cursor_plane.y != y) {
-		if (drmModeMoveCursor(c->drm.fd, output->crtc_id, x, y))
+		if (drmModeMoveCursor(c->drm.fd, output->crtc_id, x, y)) {
 			weston_log("failed to move cursor: %m\n");
+			c->cursors_are_broken = 1;
+		}
+
 		output->cursor_plane.x = x;
 		output->cursor_plane.y = y;
 	}