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[v1] ucsi_ccg: Disable async suspend in ucsi_ccg_probe()

Message ID 6180608.lOV4Wx5bFT@rjwysocki.net
State New
Headers show
Series [v1] ucsi_ccg: Disable async suspend in ucsi_ccg_probe() | expand

Commit Message

Rafael J. Wysocki May 12, 2025, 1:26 p.m. UTC 
From: Jon Hunter <jonathanh@nvidia.com>

Commit aa7a9275ab81 ("PM: sleep: Suspend async parents after suspending
children") had triggered a suspend issue on Tegra boards because it had
reordered the syspend of devices with async suspend enabled with respect
to some other devices.  Specifically, the devices with async suspend
enabled that have no children are now suspended before any other devices
unless there are device links pointing to them as suppliers.

The investigation that followed the failure report uncovered that async
suspend was enabled for the cypd4226 device that was a Type-C controller
with a dependency on USB PHY and it turned out that disabling async
suspend for that device made the issue go away.  Since async suspend
takes dependencies between parents and children into account as well
as other dependencies between devices represented by device links, this
means that the cypd4226 has a dependency on another device that is
not represented in any form in the kernel (a "hidden" dependency), in
which case async suspend should not be enabled for it.

Accordingly, make ucsi_ccg_probe() disable async suspend for the
devices handled by, which covers the cypd4226 device on the Tegra
boards as well as other devices likely to have similar "hidden"
dependencies.

Fixes: aa7a9275ab81 ("PM: sleep: Suspend async parents after suspending children")
Closes: https://lore.kernel.org/linux-pm/c6cd714b-b0eb-42fc-b9b5-4f5f396fb4ec@nvidia.com/
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

Commit aa7a9275ab81 is in linux-next and it has not reached the mainline yet.

Thanks!

---
 drivers/usb/typec/ucsi/ucsi_ccg.c |    2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

--- a/drivers/usb/typec/ucsi/ucsi_ccg.c
+++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
@@ -1483,6 +1483,8 @@ 
 
 	i2c_set_clientdata(client, uc);
 
+	device_disable_async_suspend(uc->dev);
+
 	pm_runtime_set_active(uc->dev);
 	pm_runtime_enable(uc->dev);
 	pm_runtime_use_autosuspend(uc->dev);