Commit 7f728318 authored by Jameson Thies's avatar Jameson Thies Committed by Greg Kroah-Hartman
Browse files

usb: typec: ucsi: resume work after EC init 



A manual EC sysjump will restart the PPM and break communication with
the UCSI driver by disabling notifications in the initial PPM state.
Update cros_ec_ucsi to listen for PPM init events and treat them as a
system resume to re-establish communication with the PPM (ChromeOS EC).

Signed-off-by: default avatarJameson Thies <jthies@google.com>
Reviewed-by: default avatarŁukasz Bartosik <ukaszb@chromium.org>
Reviewed-by: default avatarBenson Leung <bleung@chromium.org>
Link: https://lore.kernel.org/r/20250204024600.4138776-3-jthies@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent dcba6971

drivers/usb/typec/ucsi/cros_ec_ucsi.c

+12 −5
Original line number Diff line number Diff line
@@ -206,12 +206,19 @@ static int cros_ucsi_event(struct notifier_block *nb, 
{

	struct cros_ucsi_data *udata = container_of(nb, struct cros_ucsi_data, nb);



	if (!(host_event & PD_EVENT_PPM))

		return NOTIFY_OK;

	if (host_event & PD_EVENT_INIT) {

		/* Late init event received from ChromeOS EC. Treat this as a

		 * system resume to re-enable communication with the PPM.

		 */

		dev_dbg(udata->dev, "Late PD init received\n");

		ucsi_resume(udata->ucsi);

	}



	if (host_event & PD_EVENT_PPM) {

		dev_dbg(udata->dev, "UCSI notification received\n");

		flush_work(&udata->work);

		schedule_work(&udata->work);

	}



	return NOTIFY_OK;

}