drm/radeon/kms: add debugfs for power management for AtomBIOS devices

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/r520.c b/drivers/gpu/drm/radeon/r520.c
index a555b7b..f743518 100644
--- a/drivers/gpu/drm/radeon/r520.c
+++ b/drivers/gpu/drm/radeon/r520.c
@@ -260,6 +260,8 @@
 	}
 	/* Initialize clocks */
 	radeon_get_clock_info(rdev->ddev);
+	/* Initialize power management */
+	radeon_pm_init(rdev);
 	/* Get vram informations */
 	r520_vram_info(rdev);
 	/* Initialize memory controller (also test AGP) */