linux-kernel - [PATCH 4.4 26/79] usb: xhci: increase CRS timeout value

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Message-Id: <20180823074920.443357292@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:53:02 +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, Ajay Gupta <ajaykuee@...il.com>,
        Nagaraj Annaiah <naga.annaiah@...il.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 26/79] usb: xhci: increase CRS timeout value

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

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

From: Ajay Gupta <ajaykuee@...il.com>

[ Upstream commit 305886ca87be480ae159908c2affd135c04215cf ]

Some controllers take almost 55ms to complete controller
restore state (CRS).
There is no timeout limit mentioned in xhci specification so
fixing the issue by increasing the timeout limit to 100ms

[reformat code comment -Mathias]
Signed-off-by: Ajay Gupta <ajaykuee@...il.com>
Signed-off-by: Nagaraj Annaiah <naga.annaiah@...il.com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/host/xhci.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1052,8 +1052,13 @@ int xhci_resume(struct xhci_hcd *xhci, b
 		command = readl(&xhci->op_regs->command);
 		command |= CMD_CRS;
 		writel(command, &xhci->op_regs->command);
+		/*
+		 * Some controllers take up to 55+ ms to complete the controller
+		 * restore so setting the timeout to 100ms. Xhci specification
+		 * doesn't mention any timeout value.
+		 */
 		if (xhci_handshake(&xhci->op_regs->status,
-			      STS_RESTORE, 0, 10 * 1000)) {
+			      STS_RESTORE, 0, 100 * 1000)) {
 			xhci_warn(xhci, "WARN: xHC restore state timeout\n");
 			spin_unlock_irq(&xhci->lock);
 			return -ETIMEDOUT;