drm/nouveau/pm: fix oops if chipset has no pm support at all
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.c b/drivers/gpu/drm/nouveau/nouveau_pm.c
index dcc1692..34d591b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_pm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.c
@@ -284,9 +284,11 @@
memset(perflvl, 0, sizeof(*perflvl));
- ret = pm->clocks_get(dev, perflvl);
- if (ret)
- return ret;
+ if (pm->clocks_get) {
+ ret = pm->clocks_get(dev, perflvl);
+ if (ret)
+ return ret;
+ }
if (pm->voltage.supported && pm->voltage_get) {
ret = pm->voltage_get(dev);