From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-out.m-online.net (mail-out.m-online.net [212.18.0.10]) by ozlabs.org (Postfix) with ESMTP id 19EA0B6F19 for ; Sun, 20 Dec 2009 05:56:59 +1100 (EST) To: Hunter Cobbs From: Wolfgang Denk Subject: Re: DWC_OTG Issues MIME-Version: 1.0 Content-type: text/plain; charset=ISO-8859-1 In-reply-to: <1261190115.14590.5.camel@mobiLinux> References: <1261176637-23912-1-git-send-email-ptyser@xes-inc.com> <1261190115.14590.5.camel@mobiLinux> Date: Sat, 19 Dec 2009 19:56:57 +0100 Message-Id: <20091219185657.5FF29E85072@gemini.denx.de> Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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