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thunderbolt: Log DisplayPort adapter rate and lanes on discovery

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

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2023-05-24 14:03:55 +03:00
parent f1138fda1b
commit 033c2d8ab2
1 changed files with 43 additions and 0 deletions
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43
drivers/thunderbolt/tunnel.c
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@ -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;