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From 2eb03118784d98cc6cd1d1cadd2badc0cfd19469 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 11 Jul 2014 14:21:08 +0200
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Subject: [PATCH 28/43] usb: add usb_pick_speed
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Message-id: <1405088470-24115-36-git-send-email-kraxel@redhat.com>
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Patchwork-id: 59839
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 35/37] usb: add usb_pick_speed
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Bugzilla: 1075846
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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We can pick the usb port speed in generic code, by looking at the port
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and device speed masks and looking for the fastest match.  So add a
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function to do exactly that, and drop the speed setting code from
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usb_desc_attach as it isn't needed any more.
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This way we can set the device speed before calling port->ops->attach,
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which fixes some xhci hotplug issues.
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https://bugzilla.redhat.com/show_bug.cgi?id=1046873
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit b791c3b38c7969cb9f4acda8229e19fd865a1c08)
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---
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 hw/usb/core.c    | 21 +++++++++++++++++++++
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 hw/usb/desc.c    | 12 ------------
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 include/hw/usb.h |  1 +
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 3 files changed, 22 insertions(+), 12 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 hw/usb/core.c    | 21 +++++++++++++++++++++
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 hw/usb/desc.c    | 12 ------------
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 include/hw/usb.h |  1 +
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 3 files changed, 22 insertions(+), 12 deletions(-)
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diff --git a/hw/usb/core.c b/hw/usb/core.c
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index 67ba7d6..cf34755 100644
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--- a/hw/usb/core.c
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+++ b/hw/usb/core.c
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@@ -28,6 +28,26 @@
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 #include "qemu/iov.h"
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 #include "trace.h"
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+void usb_pick_speed(USBPort *port)
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+{
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+    static const int speeds[] = {
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+        USB_SPEED_SUPER,
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+        USB_SPEED_HIGH,
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+        USB_SPEED_FULL,
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+        USB_SPEED_LOW,
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+    };
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+    USBDevice *udev = port->dev;
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+    int i;
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+
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+    for (i = 0; i < ARRAY_SIZE(speeds); i++) {
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+        if ((udev->speedmask & (1 << speeds[i])) &&
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+            (port->speedmask & (1 << speeds[i]))) {
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+            udev->speed = speeds[i];
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+            return;
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+        }
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+    }
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+}
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+
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 void usb_attach(USBPort *port)
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 {
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     USBDevice *dev = port->dev;
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@@ -35,6 +55,7 @@ void usb_attach(USBPort *port)
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     assert(dev != NULL);
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     assert(dev->attached);
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     assert(dev->state == USB_STATE_NOTATTACHED);
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+    usb_pick_speed(port);
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     port->ops->attach(port);
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     dev->state = USB_STATE_ATTACHED;
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     usb_device_handle_attach(dev);
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diff --git a/hw/usb/desc.c b/hw/usb/desc.c
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index f133ddb..138881f 100644
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--- a/hw/usb/desc.c
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+++ b/hw/usb/desc.c
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@@ -518,18 +518,6 @@ void usb_desc_init(USBDevice *dev)
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 void usb_desc_attach(USBDevice *dev)
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 {
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-    const USBDesc *desc = usb_device_get_usb_desc(dev);
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-
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-    assert(desc != NULL);
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-    if (desc->super && (dev->port->speedmask & USB_SPEED_MASK_SUPER)) {
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-        dev->speed = USB_SPEED_SUPER;
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-    } else if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {
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-        dev->speed = USB_SPEED_HIGH;
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-    } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {
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-        dev->speed = USB_SPEED_FULL;
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-    } else {
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-        return;
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-    }
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     usb_desc_setdefaults(dev);
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 }
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diff --git a/include/hw/usb.h b/include/hw/usb.h
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index 000001b..ebbff47 100644
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--- a/include/hw/usb.h
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+++ b/include/hw/usb.h
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@@ -453,6 +453,7 @@ void usb_ep_combine_input_packets(USBEndpoint *ep);
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 void usb_combined_input_packet_complete(USBDevice *dev, USBPacket *p);
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 void usb_combined_packet_cancel(USBDevice *dev, USBPacket *p);
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+void usb_pick_speed(USBPort *port);
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 void usb_attach(USBPort *port);
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 void usb_detach(USBPort *port);
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 void usb_port_reset(USBPort *port);
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-- 
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1.8.3.1
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