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authorKranthi Kuntala <kranthi.kuntala@intel.com>2020-03-05 16:39:58 +0200
committerMika Westerberg <mika.westerberg@linux.intel.com>2020-06-22 19:58:32 +0300
commitdacb12877d9222e0281b8391e3361fd4c7a7435a (patch)
treec9cf01118dd0b04124d25bdb39a721ca6bcc03fc /drivers/thunderbolt/switch.c
parent02d12855f51651cc9cf8e59e6cbb24a5d9e0a054 (diff)
thunderbolt: Add support for on-board retimers
USB4 spec specifies standard access to retimers (both on-board and cable) through USB4 port sideband access. This makes it possible to upgrade their firmware in the same way than we already do with the routers. This enumerates on-board retimers under each USB4 port when the link comes up and adds them to the bus under the router the retimer belongs to. Retimers are exposed in sysfs with name like <device>:<port>.<index> where device is the router the retimer belongs to, port is the USB4 port the retimer is connected to and index is the retimer index under that port (starting from 1). This applies to the upstream USB4 port as well so if there is on-board retimer between the port and the router it is also added accordingly. At this time we do not add cable retimers but there is no techincal restriction to do so in the future if needed. It is not clear whether it makes sense to upgrade their firmwares and at least Thunderbolt 3 cables it has not been done outside of lab environments. The sysfs interface is made to follow the router NVM upgrade to make it easy to extend the existing userspace (fwupd) to handle these as well. Signed-off-by: Kranthi Kuntala <kranthi.kuntala@intel.com> Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/switch.c')
-rw-r--r--drivers/thunderbolt/switch.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index c8ed614f14e6..817c66c7adcf 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2392,6 +2392,9 @@ void tb_switch_remove(struct tb_switch *sw)
tb_xdomain_remove(port->xdomain);
port->xdomain = NULL;
}
+
+ /* Remove any downstream retimers */
+ tb_retimer_remove_all(port);
}
if (!sw->is_unplugged)