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

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Message-Id: <20210520092138.717064634@linuxfoundation.org>
Date:   Thu, 20 May 2021 11:19:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 222/425] usb: dwc2: Fix host mode hibernation exit with remote wakeup flow.

From: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>

[ 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@...opsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
Link: https://lore.kernel.org/r/20210416124707.5EEC2A005D@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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