[PATCH 4.19 222/425] usb: dwc2: Fix host mode hibernation exit with remote wakeup flow.

From: Greg Kroah-Hartman
Date: Thu May 20 2021 - 06:04:11 EST


From: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>

[ Upstream commit c2db8d7b9568b10e014af83b3c15e39929e3579e ]

Added setting "port_connect_status_change" flag to "1" in order
to re-enumerate, because after exit from hibernation port
connection status is not detected.

Fixes: c5c403dc4336 ("usb: dwc2: Add host/device hibernation functions")
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210416124707.5EEC2A005D@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/usb/dwc2/hcd.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 91686e1b24d9..58e53e3d905b 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -5741,7 +5741,15 @@ int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
return ret;
}

- dwc2_hcd_rem_wakeup(hsotg);
+ if (rem_wakeup) {
+ dwc2_hcd_rem_wakeup(hsotg);
+ /*
+ * Change "port_connect_status_change" flag to re-enumerate,
+ * because after exit from hibernation port connection status
+ * is not detected.
+ */
+ hsotg->flags.b.port_connect_status_change = 1;
+ }

hsotg->hibernated = 0;
hsotg->bus_suspended = 0;
--
2.30.2