drm/nouveau/disp/dp: split link config/power into two steps

We want to be able to power down the lanes for DPMS off.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
index efccbab..5d4b034 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
@@ -94,6 +94,8 @@
 		return ret;
 	}
 
+	impl->lnk_pwr(outp, dp->link_nr);
+
 	/* set desired link configuration on the sink */
 	sink[0] = dp->link_bw / 27000;
 	sink[1] = dp->link_nr;