From 44790462d041d3037d60b3bf88f30837a72006ff Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Tue, 14 Jul 2015 11:33:31 +1000 Subject: drm/dp/mst: dump branch OUI in debugfs (v2) 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. v2: Thierry made me feel guilty, so I parsed the branch OUI. Reviewed-by: Thierry Reding Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/gpu/drm/drm_dp_mst_topology.c') diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index b0487c9..86bc9ad 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2631,6 +2631,16 @@ void drm_dp_mst_dump_topology(struct seq_file *m, seq_printf(m, "%02x ", buf[i]); seq_printf(m, "\n"); + /* dump the standard OUI branch header */ + ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); + seq_printf(m, "branch oui: "); + for (i = 0; i < 0x3; i++) + seq_printf(m, "%02x", buf[i]); + seq_printf(m, " devid: "); + for (i = 0x3; i < 0x8; i++) + seq_printf(m, "%c", buf[i]); + seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); + seq_printf(m, "\n"); bret = dump_dp_payload_table(mgr, buf); if (bret == true) { seq_printf(m, "payload table: "); -- cgit v1.1