drm/i915/fbdev: do not create fbdev if HPD is suspended

In case of deferred FB setup core can try to create new
framebuffer. Disallow it if hpd_suspended flag is set.
Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220826141929.189681-4-andrzej.hajda@intel.com

drivers/gpu/drm/i915/display/intel_fbdev.c

@@ -210,6 +210,12 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	struct drm_i915_gem_object *obj;
 	int ret;
 
+	mutex_lock(&ifbdev->hpd_lock);
+	ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
+	mutex_unlock(&ifbdev->hpd_lock);
+	if (ret)
+		return ret;
+
 	if (intel_fb &&
 	    (sizes->fb_width > intel_fb->base.width ||
 	     sizes->fb_height > intel_fb->base.height)) {