Date: Tue, 5 Jan 2016 08:00:14 +0100 From: Sebastian Huber <sebastian.huber@embedded-brains.de> To: freebsd-usb@freebsd.org Subject: dwc_otg: Problem with directly connected full/low speed devices Message-ID: <568B69FE.5030307@embedded-brains.de>
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Hello,
I use an Altera Cyclone V development kit which the dwc_otg driver from=20
FreeBSD. The device enumeration of full/low speed devices directly=20
connected to the root hub fails since split transactions are used. If I=20
connect them via a hub it works fine. I used the following hack to get=20
them working with a direct connection:
diff --git a/sys/dev/usb/controller/dwc_otg.c=20
b/sys/dev/usb/controller/dwc_otg.c
index 2110b94..37cca8e 100644
--- a/sys/dev/usb/controller/dwc_otg.c
+++ b/sys/dev/usb/controller/dwc_otg.c
@@ -3340,7 +3340,7 @@ dwc_otg_setup_standard_chain(struct usb_xfer *xfer)
case USB_SPEED_FULL:
case USB_SPEED_LOW:
/* check if root HUB port is running High Speed =
*/
- if (xfer->xroot->udev->parent_hs_hub !=3D NULL) {
+ if (xfer->xroot->udev->parent_hs_hub !=3D NULL &&=
0) {
hcsplt =3D HCSPLT_SPLTENA |
(xfer->xroot->udev->hs_port_no <<
HCSPLT_PRTADDR_SHIFT) |
I am not sure how to fix this properly. Is this a specific problem with=20
the Altera Cyclone V board or is this problem also present on other=20
boards e.g. RPI2?
--=20
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.huber@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine gesch=C3=A4ftliche Mitteilung im Sinne des EHUG=
.
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