From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-x22c.google.com (mail-ig0-x22c.google.com [IPv6:2607:f8b0:4001:c05::22c]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3AF5C1A0F90 for ; Fri, 9 Jan 2015 18:21:21 +1100 (AEDT) Received: by mail-ig0-f172.google.com with SMTP id hl2so364435igb.5 for ; Thu, 08 Jan 2015 23:21:18 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <66A26A9AA227D947AF088537F041526E2009E5@VSVR-EX10-MB1.pocatec.com> From: Peter Chen Date: Fri, 9 Jan 2015 15:20:58 +0800 Message-ID: Subject: Re: PROBLEM: USB isochronous urb leak on EHCI driver To: Alan Stern Content-Type: text/plain; charset=UTF-8 Cc: Michael Tessier , "linuxppc-dev@lists.ozlabs.org" , "linux-usb@vger.kernel.org" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, Jan 7, 2015 at 2:22 AM, Alan Stern wrote: > On Tue, 6 Jan 2015, Michael Tessier wrote: > >> > > > > That is interresting, however, I have an older kernel running an >> > > > > OHCI driver which is able to handle 4 codecs. Same usb hardware >> > > > > (codecs and hub), but older kernel on a different CPU, with much >> > > > > less power. This makes me believe that there's a solution to make it work... >> > > > >> > > > Of course there is: Install an OHCI host controller and use it to drive your codecs. It should work fine. >> >> What do you mean by that? The host controller is embedded in the i.MX CPU... >> Changing the CPU is not really an option to me. Unless I am missing >> something? > > I didn't realize you were talking about an i.MX-based system. On a > computer with a free PCI slot, it's easy to add an OHCI controller. > iMX isn't as accomodating. > iMX uses chipidea controller which TT is build-in, and it does NOT support OHCI controller. > If there's no way to add an extra USB controller to your system then > the only choice is to upgrade the driver software. > > Alan Stern > > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- BR, Peter Chen