+/*
+ * eDP brightness callbacks need to happen under lock, since we need to
+ * enable/disable the backlight ourselves for modesets
+ */
+static int
+nv50_edp_get_brightness(struct backlight_device *bd)
+{
+ struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
+ struct drm_device *dev = connector->dev;
+ struct drm_crtc *crtc;
+ struct drm_modeset_acquire_ctx ctx;
+ int ret = 0;
+
+ drm_modeset_acquire_init(&ctx, 0);
+
+retry:
+ ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
+ if (ret == -EDEADLK)
+ goto deadlock;
+ else if (ret < 0)
+ goto out;
+
+ crtc = connector->state->crtc;
+ if (!crtc)
+ goto out;
+
+ ret = drm_modeset_lock(&crtc->mutex, &ctx);
+ if (ret == -EDEADLK)
+ goto deadlock;
+ else if (ret < 0)
+ goto out;
+
+ if (!crtc->state->active)
+ goto out;
+
+ ret = bd->props.brightness;
+out:
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+ return ret;
+deadlock:
+ drm_modeset_backoff(&ctx);
+ goto retry;
+}
+
+static int
+nv50_edp_set_brightness(struct backlight_device *bd)
+{
+ struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
+ struct nouveau_connector *nv_connector = nouveau_connector(connector);
+ struct drm_device *dev = connector->dev;
+ struct drm_crtc *crtc;
+ struct drm_dp_aux *aux = &nv_connector->aux;
+ struct nouveau_backlight *nv_bl = nv_connector->backlight;
+ struct drm_modeset_acquire_ctx ctx;
+ int ret = 0;
+
+ drm_modeset_acquire_init(&ctx, 0);
+retry:
+ ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
+ if (ret == -EDEADLK)
+ goto deadlock;
+ else if (ret < 0)
+ goto out;
+
+ crtc = connector->state->crtc;
+ if (!crtc)
+ goto out;
+
+ ret = drm_modeset_lock(&crtc->mutex, &ctx);
+ if (ret == -EDEADLK)
+ goto deadlock;
+ else if (ret < 0)
+ goto out;
+
+ if (crtc->state->active)
+ ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
+
+out:
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+ return ret;
+deadlock:
+ drm_modeset_backoff(&ctx);
+ goto retry;
+}
+
+static const struct backlight_ops nv50_edp_bl_ops = {
+ .get_brightness = nv50_edp_get_brightness,
+ .update_status = nv50_edp_set_brightness,
+};
+