Dear Sarah,
We noticed a couple of problems with the Linux xHCI driver:
1. There is a problem with URB cancellation for USB 2.0 device on USB
3.0 host. When we disable our device, we cancel all pending URBs by
calling ioctl with the request code of USBDEVFS_DISCARDURB. When we
re-enable our devi
Hi Sarah,
>> 2. Clear Halt of EP
>
> Also note that the xHCI hardware will only allow the Reset Endpoint to
> complete if the endpoint was actually halted due to a stall, babble,
> transfer error, etc. It won't reset the endpoint toggles or sequence
> number at arbitrary points, so we can't reset
u are
releasing access to the device just to keep using it. While it is
unlikely that we will have some other process come in and grab the
interface, it still just strikes us as unclean.
Yuliya
On Wed, Oct 3, 2012 at 8:13 AM, Alan Stern wrote:
> On Tue, 2 Oct 2012, Yuliya T wrote:
>
>&
Hi Alan and Sarah,
I confirmed that simply calling usb_set_altinterface (which via libusb
calls the kernel function usb_set_interface) does correctly clear the
toggle bits for USB2 or sequence number for USB3 on an XHCI host
controller, even when the alternate interface setting is the same as
the
l for these transactions.
Thanks.
Yuliya
On Tue, Oct 2, 2012 at 5:23 PM, Yuliya T wrote:
> We ran into a problem when using ASMedia Technology Inc. ASM1042
> SuperSpeed USB Host Controller (integrated on the desktop's
> motherboard) with Linux xHCI driver. The host is sending the
&g
ernel debugging turned on).
Thanks,
Yuliya
On Tue, Oct 2, 2012 at 5:09 PM, Yuliya T wrote:
> Hi Sarah,
>
>>> Re: URB Cancellation for USB 2.0 device on xHCI host
>>
>> Which host controller are you running under? Please send the output of
>> `sudo lspci -vvv` and `sudo
