drm/nv50/pm: wait for all fifo-connected engines to idle before reclocking

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv50_pm.c b/drivers/gpu/drm/nouveau/nv50_pm.c
index 0f26326..e677310 100644
--- a/drivers/gpu/drm/nouveau/nv50_pm.c
+++ b/drivers/gpu/drm/nouveau/nv50_pm.c
@@ -798,6 +798,8 @@
 	nv_mask(dev, 0x002504, 0x00000001, 0x00000001);
 	if (!nv_wait(dev, 0x002504, 0x00000010, 0x00000010))
 		goto resume;
+	if (!nv_wait(dev, 0x00251c, 0x0000003f, 0x0000003f))
+		goto resume;
 
 	/* program memory clock, if necessary - must come before engine clock
 	 * reprogramming due to how we construct the hwsq scripts in pre()