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[Qemu-devel] [PATCH] usb-ehci: Clear the portstatus powner bit on device
From: |
Hans de Goede |
Subject: |
[Qemu-devel] [PATCH] usb-ehci: Clear the portstatus powner bit on device disconnect |
Date: |
Fri, 13 Jan 2012 14:28:56 +0100 |
According to the EHCI spec port ownerhsip should revert to the EHCI controller
on device disconnect. This fixes the problem of a port getting stuck on USB 1
when using redirection and plugging in a USB 2 device after a USB 1 device
has been redirected.
Signed-off-by: Hans de Goede <address@hidden>
---
hw/usb-ehci.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
index a946e1d..69bcc4b 100644
--- a/hw/usb-ehci.c
+++ b/hw/usb-ehci.c
@@ -764,6 +764,11 @@ static void ehci_detach(USBPort *port)
USBPort *companion = s->companion_ports[port->index];
companion->ops->detach(companion);
companion->dev = NULL;
+ /*
+ * EHCI spec 4.2.2: "When a disconnect occurs... On the event,
+ * the port ownership is returned immediately to the EHCI controller."
+ */
+ *portsc &= ~PORTSC_POWNER;
return;
}
--
1.7.7.4
- [Qemu-devel] [PATCH] usb-ehci: Clear the portstatus powner bit on device disconnect,
Hans de Goede <=