Re: [PATCH 00/23] em28xx: add support fur USB bulk transfers

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Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx> writes:

> It seems like your device has no bulk endpoint for DVB.
> What does lsusb say ?

lsusb mentions 4 different end points, all isochronous. So out of luck
there. I did not know I could use lsusb to find this out.

> The module parameter is called prefer_bulk, but what it actually does is
> "force bulk" (which doesn't make much sense when the device has no bulk
> endpoints).
> I will fix this in v2 of the patch series.

Well, I was hoping to get "force_bulk", so that part is not a problem
for me.

> Am 31.10.2012 03:39, schrieb Benny Amorsen:

>> It works great with isochronous transfers on my PC and the Fedora
>> kernel, but the Raspberry USB host blows up when trying to do
>> isochronous mode.
>
> Is this a regression caused by patches or a general issue with the
> Raspberry board ?

It is a general issue with the Raspberry USB host controller or driver.
Bulk transfers work, isochronous transfers have problems. I was hoping I
could somehow convince the Nanostick to use bulk transfers instead of
isochronous transfers. Since that seems to require a firmware change, I
will have to give up on it.


/Benny

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