Commit 033c2d8a authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Log DisplayPort adapter rate and lanes on discovery 



This may be helpful when debugging possible issues around DisplayPort
port tunneling.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent f1138fda

drivers/thunderbolt/tunnel.c

+43 −0
Original line number Diff line number Diff line
@@ -1137,6 +1137,47 @@ static int tb_dp_init_video_path(struct tb_path *path) 
	return 0;

}



static void tb_dp_dump(struct tb_tunnel *tunnel)

{

	struct tb_port *in, *out;

	u32 dp_cap, rate, lanes;



	in = tunnel->src_port;

	out = tunnel->dst_port;



	if (tb_port_read(in, &dp_cap, TB_CFG_PORT,

			 in->cap_adap + DP_LOCAL_CAP, 1))

		return;



	rate = tb_dp_cap_get_rate(dp_cap);

	lanes = tb_dp_cap_get_lanes(dp_cap);



	tb_port_dbg(in, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",

		    rate, lanes, tb_dp_bandwidth(rate, lanes));



	out = tunnel->dst_port;



	if (tb_port_read(out, &dp_cap, TB_CFG_PORT,

			 out->cap_adap + DP_LOCAL_CAP, 1))

		return;



	rate = tb_dp_cap_get_rate(dp_cap);

	lanes = tb_dp_cap_get_lanes(dp_cap);



	tb_port_dbg(out, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",

		    rate, lanes, tb_dp_bandwidth(rate, lanes));



	if (tb_port_read(in, &dp_cap, TB_CFG_PORT,

			 in->cap_adap + DP_REMOTE_CAP, 1))

		return;



	rate = tb_dp_cap_get_rate(dp_cap);

	lanes = tb_dp_cap_get_lanes(dp_cap);



	tb_port_dbg(in, "reduced bandwidth %u Mb/s x%u = %u Mb/s\n",

		    rate, lanes, tb_dp_bandwidth(rate, lanes));

}



/**

 * tb_tunnel_discover_dp() - Discover existing Display Port tunnels

 * @tb: Pointer to the domain structure
@@ -1214,6 +1255,8 @@ struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in, 
		goto err_deactivate;

	}



	tb_dp_dump(tunnel);



	tb_tunnel_dbg(tunnel, "discovered\n");

	return tunnel;