[PATCH] drm/dp/mst: dump branch OUI in debugfs

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

It appears some MST docks are worse than other, but the only
way to know is to see the sw revisions in here, so dump
the branch OUI so we can look at the sw revision.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 8a3bfcd..e17a639 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2657,6 +2657,11 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 			seq_printf(m, "%02x ", buf[i]);
 		seq_printf(m, "\n");
 
+		ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_RECEIVER_CAP_SIZE);
+		seq_printf(m, "branch oui: ");
+		for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++)
+			seq_printf(m, "%02x ", buf[i]);
+		seq_printf(m, "\n");
 		bret = dump_dp_payload_table(mgr, buf);
 		if (bret == true) {
 			seq_printf(m, "payload table: ");
-- 
2.4.3