From 39fb148abd818e9cb0454a4186bd5218be2d31e8 Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Fri, 3 Sep 2021 17:27:48 -0400
Subject: [PATCH] UHCI: Disable isochronous transfers support.

It busyloops, and at least on QEMU, does not seem to work at all.
---
 src/add-ons/kernel/busses/usb/uhci.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/add-ons/kernel/busses/usb/uhci.cpp b/src/add-ons/kernel/busses/usb/uhci.cpp
index 9fcd787ed5..95fa32a4d2 100644
--- a/src/add-ons/kernel/busses/usb/uhci.cpp
+++ b/src/add-ons/kernel/busses/usb/uhci.cpp
@@ -719,8 +719,14 @@ UHCI::SubmitTransfer(Transfer *transfer)
 		return SubmitRequest(transfer);
 
 	// Process isochronous transfers
+#if 0
 	if (pipe->Type() & USB_OBJECT_ISO_PIPE)
 		return SubmitIsochronous(transfer);
+#else
+	// At present, isochronous transfers cause busylooping, and do not seem to work.
+	if (pipe->Type() & USB_OBJECT_ISO_PIPE)
+		return B_NOT_SUPPORTED;
+#endif
 
 	uhci_td *firstDescriptor = NULL;
 	uhci_qh *transferQueue = NULL;