Re: [RFC/PATCH 2/2] usb: ehci: Add support for SINGLE_STEP_SET_FEATURE test of EHSET

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On Fri, 9 Aug 2013, Felipe Balbi wrote:

> > > Wait a minute, didn't we discuss a while back that these test features
> > > should be built into usbcore so that we could have a usbcv clone for
> > > linux ?
> > 
> > There's no way this can be built into the core.  This test requires the
> > behavior of the host controller to be modified at a low level
> > (introducing a 15-second delay between the Setup and Data stages of a
> > control transfer).  Only the HCD can do that.
> 
> heh, it doesn't need to be entirely in the core. Core could have the
> generic calls and HCDs could implement some callbacks, but I think quite
> a bit of the code will be similar if we implement the same thing on all
> HCDs.

What generic calls and callbacks would you suggest?  I assume you want 
enough to cover not just this one test but the entire USB-CV suite.

> > Besides, doesn't USB-CV install its own version of Windows' EHCI driver 
> > while it runs its tests?
> 
> IIRC only USB20CV, the new USB30CV (which also tests USB2) doesn't do
> that.

I don't have more than the foggiest notion of how these things really
work under Windows.

Alan Stern

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