linux-kernel - [PATCH 4.17 052/324] usb: dwc2: Fix host exit from hibernation flow.

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Message-Id: <20180823074958.400145782@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:51:58 +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 <hminas@...opsys.com>,
        Artur Petrosyan <arturp@...opsys.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 052/324] usb: dwc2: Fix host exit from hibernation flow.

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit 22bb5cfdf13ae70c6a34508a16cfeee48f162443 ]

In case when a hub is connected to DWC2 host
auto suspend occurs and host goes to
hibernation. When any device connected to hub
host hibernation exiting incorrectly.

- Added dwc2_hcd_rem_wakeup() function call to
  exit from suspend state by remote wakeup.

- Increase timeout value for port suspend bit to be set.

Acked-by: Minas Harutyunyan <hminas@...opsys.com>
Signed-off-by: Artur Petrosyan <arturp@...opsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc2/hcd.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -5437,7 +5437,7 @@ int dwc2_host_enter_hibernation(struct d
 	dwc2_writel(hprt0, hsotg->regs + HPRT0);
 
 	/* Wait for the HPRT0.PrtSusp register field to be set */
-	if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 300))
+	if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
 		dev_warn(hsotg->dev, "Suspend wasn't generated\n");
 
 	/*
@@ -5618,6 +5618,8 @@ int dwc2_host_exit_hibernation(struct dw
 		return ret;
 	}
 
+	dwc2_hcd_rem_wakeup(hsotg);
+
 	hsotg->hibernated = 0;
 	hsotg->bus_suspended = 0;
 	hsotg->lx_state = DWC2_L0;