From 94b8b48edfdcfdd24553028efaae2f817a70cc96 Mon Sep 17 00:00:00 2001
From: Ladi Prosek <lprosek@redhat.com>
Date: Wed, 17 May 2017 12:36:15 +0200
Subject: [PATCH 16/27] usb-hub: clear PORT_STAT_SUSPEND on wakeup

RH-Author: Ladi Prosek <lprosek@redhat.com>
Message-id: <20170517123615.9871-2-lprosek@redhat.com>
Patchwork-id: 75259
O-Subject: [RHV-7.4 qemu-kvm-rhev PATCH 1/1] usb-hub: clear PORT_STAT_SUSPEND on wakeup
Bugzilla: 1447581
RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>

The spec says:

  Suspend: (PORT_SUSPEND) This field indicates whether or not the device
  on this port is suspended. Setting this field causes the device to
  suspend by not propagating bus traffic downstream. This field may be
  reset by a request or by resume signaling from the device attached to
  the port.

I can't find any specific statement like "the PORT_SUSPEND field is reset
automatically on remote wakeup", but without this patch, the only way to
reset it is via the ClearPortFeature request so the ".. or by resume
signaling from the device" clause is clearly not implemented on the remote
wakeup path.

The default xhci Windows driver does not issue the ClearPortFeature request
and suspended devices attached to a hub don't properly get out of the
suspended state. Interestingly, the default uhci Windows driver *does*
issue the ClearPortFeature request and does not exhibit this problem.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Message-id: 20170511125314.24549-3-lprosek@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry-picked from commit 66849dcfbed4be2ba012fd55631558c623c43f89)
Signed-off-by: Ladi Prosek <lprosek@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/usb/dev-hub.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/usb/dev-hub.c b/hw/usb/dev-hub.c
index 9fe7333..47b7519 100644
--- a/hw/usb/dev-hub.c
+++ b/hw/usb/dev-hub.c
@@ -208,6 +208,7 @@ static void usb_hub_wakeup(USBPort *port1)
     USBHubPort *port = &s->ports[port1->index];
 
     if (port->wPortStatus & PORT_STAT_SUSPEND) {
+        port->wPortStatus &= ~PORT_STAT_SUSPEND;
         port->wPortChange |= PORT_STAT_C_SUSPEND;
         usb_wakeup(s->intr, 0);
     }
-- 
1.8.3.1