Dear Hunter Cobbs,

In message <1261190115.14590.5.camel@mobiLinux> you wrote:

Hello list.  I've run into a rather odd problem.  I seem to have a
problem with full-speed isochronous transfers across a USB2.0 Hub.  I
believe this was observed before with the general EHCI drivers in Linux.

Which exazct kernel / driver cversions are you talking about?

In the latest branch of the kernel, the EHCI driver has some "Enhanced
Transaction Translation" scheduling.  This would be great for me to use
as it seems to directly address the issues I've seen.  However, I'm not
really sure on how to proceed because the DWC_OTG driver is not GPL code

Oops? if that wa the case you could not use (and distribute) this code
in a Linux context at all.

while the EHCI code I'd like to use is.  Therefore, I don't believe that
I can port the Enhanced Transaction Translation routine into the DWC_OTG
driver without violating both the GPL and Synopsis's own driver.

What makes you think so?

The Synopsis dwc_otg driver license does not seem to be  in  conflict
to  the  GPL,  if  you  ask  me (but then, I am not a layer). When we
worked on this, we were assured that the use of this driver source in
the context of GPLed software like the Linux kernel (or  U-Boot)  was
not considered an issue by Synopsis.

Does anyone have a suggestion on how to proceed?

We have been doing some work on the DWC drivers in the past, fixing a
number of issues. [We never  attempted  to  psuh  any  of  this  into
mainline  as  the  Synopsis  drivers  are  -  in  our  opinion  - not
avcceptable for mainline but require more  or  less  a  rewrite  from
scratch. But you can find all this stuff in our linux-2.6-denx repo.]

I recommend you give a try to our latest stable branch.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
What is research but a blind date with knowledge?      -- Will Harvey