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thunderbolt: Runtime resume USB4 port when retimers are scanned 

Sometimes when plugging in a USB4 device we might see following error:

  thunderbolt 1-0:3.1: runtime PM trying to activate child device 1-0:3.1 but parent (usb4_port3) is not active

This happens because the parent USB4 port was still runtime suspended.
Fix this by runtime resuming the USB4 port before scanning the retimers
below it.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2021-11-15 19:10:51 +02:00
parent 43bddb26e2
commit 1e56c88ade
1 changed files with 18 additions and 10 deletions
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28
drivers/thunderbolt/retimer.c
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@ -324,15 +324,10 @@ struct device_type tb_retimer_type = {
static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status)
{
struct usb4_port *usb4;
struct tb_retimer *rt;
u32 vendor, device;
int ret;
usb4 = port->usb4;
if (!usb4)
return -EINVAL;
ret = usb4_port_retimer_read(port, index, USB4_SB_VENDOR_ID, &vendor,
sizeof(vendor));
if (ret) {
@ -374,7 +369,7 @@ static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status)
rt->port = port;
rt->tb = port->sw->tb;
rt->dev.parent = &usb4->dev;
rt->dev.parent = &port->usb4->dev;
rt->dev.bus = &tb_bus_type;
rt->dev.type = &tb_retimer_type;
dev_set_name(&rt->dev, "%s:%u.%u", dev_name(&port->sw->dev),
@ -453,6 +448,13 @@ int tb_retimer_scan(struct tb_port *port, bool add)
{
u32 status[TB_MAX_RETIMER_INDEX + 1] = {};
int ret, i, last_idx = 0;
struct usb4_port *usb4;
usb4 = port->usb4;
if (!usb4)
return 0;
pm_runtime_get_sync(&usb4->dev);
/*
* Send broadcast RT to make sure retimer indices facing this
@ -460,7 +462,7 @@ int tb_retimer_scan(struct tb_port *port, bool add)
*/
ret = usb4_port_enumerate_retimers(port);
if (ret)
return ret;
goto out;
/*
* Enable sideband channel for each retimer. We can do this
@ -490,8 +492,10 @@ int tb_retimer_scan(struct tb_port *port, bool add)
break;
}
if (!last_idx)
return 0;
if (!last_idx) {
ret = 0;
goto out;
}
/* Add on-board retimers if they do not exist already */
for (i = 1; i <= last_idx; i++) {
@ -507,7 +511,11 @@ int tb_retimer_scan(struct tb_port *port, bool add)
}
}
return 0;
out:
pm_runtime_mark_last_busy(&usb4->dev);
pm_runtime_put_autosuspend(&usb4->dev);
return ret;
}
static int remove_retimer(struct device *dev, void *data)