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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2020-11-26 10:52:43 +0100 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-01-11 15:15:42 +0100 |
| commit | fdb0887c5a87c3a98958d3c5c90f871aa6d1a562 (patch) | |
| tree | 4dbc78d44f23e68a2af3debe0532dc1635f6663a /drivers/thunderbolt/switch.c | |
| parent | thunderbolt: Constify static attribute_group structs (diff) | |
| download | linux-fdb0887c5a87c3a98958d3c5c90f871aa6d1a562.tar.xz linux-fdb0887c5a87c3a98958d3c5c90f871aa6d1a562.zip | |
thunderbolt: Start lane initialization after sleep
USB4 spec says that for TBT3 compatible device routers the connection
manager needs to set SLI (Start Lane Initialization) to get the lanes
that were not connected back to functional state after sleep. Same needs
to be done if the link was XDomain.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Diffstat (limited to 'drivers/thunderbolt/switch.c')
| -rw-r--r-- | drivers/thunderbolt/switch.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 602e1835bf61..ad992e6204d9 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -1065,6 +1065,17 @@ void tb_port_lane_bonding_disable(struct tb_port *port) tb_port_set_link_width(port, 1); } +static int tb_port_start_lane_initialization(struct tb_port *port) +{ + int ret; + + if (tb_switch_is_usb4(port->sw)) + return 0; + + ret = tb_lc_start_lane_initialization(port); + return ret == -EINVAL ? 0 : ret; +} + /** * tb_port_is_enabled() - Is the adapter port enabled * @port: Port to check @@ -2694,8 +2705,22 @@ int tb_switch_resume(struct tb_switch *sw) /* check for surviving downstream switches */ tb_switch_for_each_port(sw, port) { - if (!tb_port_has_remote(port) && !port->xdomain) + if (!tb_port_has_remote(port) && !port->xdomain) { + /* + * For disconnected downstream lane adapters + * start lane initialization now so we detect + * future connects. + */ + if (!tb_is_upstream_port(port) && tb_port_is_null(port)) + tb_port_start_lane_initialization(port); continue; + } else if (port->xdomain) { + /* + * Start lane initialization for XDomain so the + * link gets re-established. + */ + tb_port_start_lane_initialization(port); + } if (tb_wait_for_port(port, true) <= 0) { tb_port_warn(port, |