drm/nouveau: replace multiple open-coded runpm support checks with function

Signed-off-by: Ben Skeggs <[e-mail]>

drivers/gpu/drm/nouveau/nouveau_drm.c

···
 module_param_named(modeset, nouveau_modeset, int, 0400);
 
 MODULE_PARM_DESC(runpm, "disable (0), force enable (1), optimus only default (-1)");
-int nouveau_runtime_pm = -1;
+static int nouveau_runtime_pm = -1;
 module_param_named(runpm, nouveau_runtime_pm, int, 0400);
 
 static struct drm_driver driver_stub;
···
 	return nouveau_do_resume(drm_dev, false);
 }
 
+bool
+nouveau_pmops_runtime()
+{
+	if (nouveau_runtime_pm == -1)
+		return nouveau_is_optimus() || nouveau_is_v1_dsm();
+	return nouveau_runtime_pm == 1;
+}
+
 static int
 nouveau_pmops_runtime_suspend(struct device *dev)
 {
···
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
 	int ret;
 
-	if (nouveau_runtime_pm == 0) {
-		pm_runtime_forbid(dev);
-		return -EBUSY;
-	}
-
-	/* are we optimus enabled? */
-	if (nouveau_runtime_pm == -1 && !nouveau_is_optimus() && !nouveau_is_v1_dsm()) {
-		DRM_DEBUG_DRIVER("failing to power off - not optimus\n");
+	if (!nouveau_pmops_runtime()) {
 		pm_runtime_forbid(dev);
 		return -EBUSY;
 	}
···
 	struct nvif_device *device = &nouveau_drm(drm_dev)->client.device;
 	int ret;
 
-	if (nouveau_runtime_pm == 0)
-		return -EINVAL;
+	if (!nouveau_pmops_runtime()) {
+		pm_runtime_forbid(dev);
+		return -EBUSY;
+	}
 
 	pci_set_power_state(pdev, PCI_D0);
 	pci_restore_state(pdev);
···
 	struct nouveau_drm *drm = nouveau_drm(drm_dev);
 	struct drm_crtc *crtc;
 
-	if (nouveau_runtime_pm == 0) {
-		pm_runtime_forbid(dev);
-		return -EBUSY;
-	}
-
-	/* are we optimus enabled? */
-	if (nouveau_runtime_pm == -1 && !nouveau_is_optimus() && !nouveau_is_v1_dsm()) {
-		DRM_DEBUG_DRIVER("failing to power off - not optimus\n");
+	if (!nouveau_pmops_runtime()) {
 		pm_runtime_forbid(dev);
 		return -EBUSY;
 	}

drivers/gpu/drm/nouveau/nouveau_drv.h

···
 #include <nvif/object.h>
 #include <nvif/device.h>
 
-extern int nouveau_runtime_pm;
-
 struct nouveau_drm {
 	struct nouveau_cli client;
 	struct drm_device *dev;
···
 
 int nouveau_pmops_suspend(struct device *);
 int nouveau_pmops_resume(struct device *);
+bool nouveau_pmops_runtime(void);
 
 #include <nvkm/core/tegra.h>
 

drivers/gpu/drm/nouveau/nouveau_vga.c

···
 nouveau_vga_init(struct nouveau_drm *drm)
 {
 	struct drm_device *dev = drm->dev;
-	bool runtime = false;
+	bool runtime = nouveau_pmops_runtime();
 
 	/* only relevant for PCI devices */
 	if (!dev->pdev)
···
 	if (pci_is_thunderbolt_attached(dev->pdev))
 		return;
 
-	if (nouveau_runtime_pm == 1)
-		runtime = true;
-	if ((nouveau_runtime_pm == -1) && (nouveau_is_optimus() || nouveau_is_v1_dsm()))
-		runtime = true;
 	vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
 
 	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
···
 nouveau_vga_fini(struct nouveau_drm *drm)
 {
 	struct drm_device *dev = drm->dev;
-	bool runtime = false;
+	bool runtime = nouveau_pmops_runtime();
 
 	vga_client_register(dev->pdev, NULL, NULL, NULL);
 
 	if (pci_is_thunderbolt_attached(dev->pdev))
 		return;
-
-	if (nouveau_runtime_pm == 1)
-		runtime = true;
-	if ((nouveau_runtime_pm == -1) && (nouveau_is_optimus() || nouveau_is_v1_dsm()))
-		runtime = true;
 
 	vga_switcheroo_unregister_client(dev->pdev);
 	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())