drm/nouveau/kms/nv50-: Use macros for DP registers in nouveau_dp.c

No functional changes.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-5-lyude@redhat.com

drivers/gpu/drm/nouveau/nouveau_dp.c

@@ -50,11 +50,13 @@ nouveau_dp_detect(struct nouveau_connector *nv_connector,
 	if (ret != sizeof(dpcd))
 		return ret;
 
-	nv_encoder->dp.link_bw = 27000 * dpcd[1];
-	nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
+	nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE];
+	nv_encoder->dp.link_nr =
+		dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
 
 	NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
-		 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]);
+		 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw,
+		 dpcd[DP_DPCD_REV]);
 	NV_DEBUG(drm, "encoder: %dx%d\n",
 		 nv_encoder->dcb->dpconf.link_nr,
 		 nv_encoder->dcb->dpconf.link_bw);