linux-kernel - [PATCH 03/15] usb: dwc2: Fix host mode hibernation exit with remote wakeup flow.

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Message-Id: <9ef7ec0b843fcf4f897bf19bfb35f5ce6761d76c.1618464534.git.Arthur.Petrosyan@synopsys.com>
Date:   Thu, 15 Apr 2021 09:39:43 +0400
From:   Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
To:     John Youn <John.Youn@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Vardan Mikayelyan <Vardan.Mikayelyan@...opsys.com>,
        Grigor Tovmasyan <Grigor.Tovmasyan@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
Subject: [PATCH 03/15] usb: dwc2: Fix host mode hibernation exit with remote wakeup flow.

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")
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
---
 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 cda3f931195d..ff945c40ef8a 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -5650,7 +5650,15 @@ 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;
-- 
2.25.1