drm/nouveau: Queue hpd_work on (runtime) resume

We need to call drm_helper_hpd_irq_event() on resume to properly detect
monitor connection / disconnection on some laptops, use hpd_work for
this to avoid deadlocks.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -699,7 +699,12 @@ nouveau_pmops_resume(struct device *dev)
 		return ret;
 	pci_set_master(pdev);
 
-	return nouveau_do_resume(drm_dev, false);
+	ret = nouveau_do_resume(drm_dev, false);
+
+	/* Monitors may have been connected / disconnected during suspend */
+	schedule_work(&nouveau_drm(drm_dev)->hpd_work);
+
+	return ret;
 }
 
 static int
@@ -773,6 +778,10 @@ nouveau_pmops_runtime_resume(struct device *dev)
 	nvif_mask(&device->object, 0x088488, (1 << 25), (1 << 25));
 	vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_ON);
 	drm_dev->switch_power_state = DRM_SWITCH_POWER_ON;
+
+	/* Monitors may have been connected / disconnected during suspend */
+	schedule_work(&nouveau_drm(drm_dev)->hpd_work);
+
 	return ret;
 }