drm/nouveau/nouveau: forward error generated while resuming objects tree

On a failed resume we may experience unrecoverable errors. Plumb the error code
through to actually let the driver fail. On a reverse-prime setup this helps the
drm subsystem to at least recover the integrated gpu.

This can especially happen with secboot timing out, leaving the hardware in a
non-functioning state.

Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -802,10 +802,15 @@ nouveau_do_suspend(struct drm_device *dev, bool runtime)
 static int
 nouveau_do_resume(struct drm_device *dev, bool runtime)
 {
+	int ret = 0;
 	struct nouveau_drm *drm = nouveau_drm(dev);
 
 	NV_DEBUG(drm, "resuming object tree...\n");
-	nvif_client_resume(&drm->master.base);
+	ret = nvif_client_resume(&drm->master.base);
+	if (ret) {
+		NV_ERROR(drm, "Client resume failed with error: %d\n", ret);
+		return ret;
+	}
 
 	NV_DEBUG(drm, "resuming fence...\n");
 	if (drm->fence && nouveau_fence(drm)->resume)
@@ -925,6 +930,7 @@ nouveau_pmops_runtime_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
 	struct nvif_device *device = &nouveau_drm(drm_dev)->client.device;
 	int ret;
 
@@ -941,6 +947,10 @@ nouveau_pmops_runtime_resume(struct device *dev)
 	pci_set_master(pdev);
 
 	ret = nouveau_do_resume(drm_dev, true);
+	if (ret) {
+		NV_ERROR(drm, "resume failed with: %d\n", ret);
+		return ret;
+	}
 
 	/* do magic */
 	nvif_mask(&device->object, 0x088488, (1 << 25), (1 << 25));