Hi Community,
I finally fix the UAC1 on Windows 7 host issue. Thanks for your help. I
will submit patches after more testing.
On 08/22/2014 10:43 AM, Xuebing Wang wrote:
On 08/21/2014 04:24 PM, Sebastian Andrzej Siewior wrote:
On 08/20/2014 02:13 AM, Peter Chen wrote:
Thanks, so Xunbing, the imx6 hardware (chipidea core) have 8 endpoints,
and support all four transfer type, it should be no problem to support
RNDIS.
But you shouldn't use RNDIS on Windows 7 or 8. As far as I recall they
do not bring the RNDIS driver which is deprecated and only "supported"
by Windows XP which is EOL by now.
Windows 7 and 8 support CDC [0] and this is what you should look for.
[0]
http://msdn.microsoft.com/en-us/library/windows/hardware/ff538820%28v=vs.85%29.aspx
Sebastian
Sebastian, Peter, Andrzej,
Thank you for your help.
1) Are you aware of any devices (based on Freescale i.MX or ChipIdea
USB IP) with a gadget driver which uses .bAlternateSetting that
support Windows 7/8?
2) The reason I am asking this is that USB 1.1 Spec (section 9.2.6.4
Standard Device Requests) says: For standard device requests that
require no Data stage, a device *must* be able to complete the request
and be able to successfully complete the Status stage of the request
*within 50 ms* of receipt of the request. This limitation applies to
requests to the device, interface, or endpoint.
I am debugging this Windows support for UAC1, thus I am referring to
USB 1.1 spec.
3) For any gadget which uses .bAlternateSetting, Host will send
USB_REQ_SET_INTERFACE Standard Device Request which requires no Data
State. I am not sure if Windows drivers strictly adhere to USB spec,
thus strictly require device to respond to USB_REQ_SET_INTERFACE
within 50ms???
4) In gadget driver set_alt functions (to handle
USB_REQ_SET_INTERFACE), ep_enable/ep_disable will be called, and
timing of this differs from hardware platform to platform (and UDC
drivers), does this explain why below function exists???
4.1) /**
* gadget_supports_altsettings - return true if altsettings work
* @gadget: the gadget in question
*/
static inline bool gadget_supports_altsettings(struct usb_gadget *gadget)
{
/* PXA 21x/25x/26x has no altsettings at all */
if (gadget_is_pxa(gadget))
return false;
/* PXA 27x and 3xx have *broken* altsetting support */
if (gadget_is_pxa27x(gadget))
return false;
/* Everything else is *presumably* fine ... */
return true;
}
4.2) /* Some controllers can't support CDC Ethernet (ECM) ... */
static inline bool can_support_ecm(struct usb_gadget *gadget)
{
if (!gadget_supports_altsettings(gadget))
return false;
/* Everything else is *presumably* fine ... but this is a bit
* chancy, so be **CERTAIN** there are no hardware issues with
* your controller. Add it above if it can't handle CDC.
*/
return true;
}
Thanks again.
--
Thanks,
Xuebing Wang
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