usb: xhci: increase CRS timeout value

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@gmail.com>
Signed-off-by: Nagaraj Annaiah <naga.annaiah@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index f11ec61..2f4850f 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1078,8 +1078,13 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
                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;