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thunderbolt: Add suspend/hibernate support

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We use _noirq since we have to restore the pci tunnels before the pci
core wakes the tunneled devices.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Noever
2014-06-03 22:04:12 +02:00
committed by Greg Kroah-Hartman
parent c90553b3c4
commit 23dd5bb49d
4 changed files with 183 additions and 0 deletions
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61
drivers/thunderbolt/tb.c
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@@ -68,6 +68,28 @@ static void tb_free_invalid_tunnels(struct tb *tb)
}
}
/**
* tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
*/
static void tb_free_unplugged_children(struct tb_switch *sw)
{
int i;
for (i = 1; i <= sw->config.max_port_number; i++) {
struct tb_port *port = &sw->ports[i];
if (tb_is_upstream_port(port))
continue;
if (!port->remote)
continue;
if (port->remote->sw->is_unplugged) {
tb_switch_free(port->remote->sw);
port->remote = NULL;
} else {
tb_free_unplugged_children(port->remote->sw);
}
}
}
/**
* find_pci_up_port() - return the first PCIe up port on @sw or NULL
*/
@@ -368,3 +390,42 @@ err_locked:
return NULL;
}
void thunderbolt_suspend(struct tb *tb)
{
tb_info(tb, "suspending...\n");
mutex_lock(&tb->lock);
tb_switch_suspend(tb->root_switch);
tb_ctl_stop(tb->ctl);
tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */
mutex_unlock(&tb->lock);
tb_info(tb, "suspend finished\n");
}
void thunderbolt_resume(struct tb *tb)
{
struct tb_pci_tunnel *tunnel, *n;
tb_info(tb, "resuming...\n");
mutex_lock(&tb->lock);
tb_ctl_start(tb->ctl);
/* remove any pci devices the firmware might have setup */
tb_switch_reset(tb, 0);
tb_switch_resume(tb->root_switch);
tb_free_invalid_tunnels(tb);
tb_free_unplugged_children(tb->root_switch);
list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list)
tb_pci_restart(tunnel);
if (!list_empty(&tb->tunnel_list)) {
/*
* the pcie links need some time to get going.
* 100ms works for me...
*/
tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
msleep(100);
}
/* Allow tb_handle_hotplug to progress events */
tb->hotplug_active = true;
mutex_unlock(&tb->lock);
tb_info(tb, "resume finished\n");
}