From mboxrd@z Thu Jan 1 00:00:00 1970 From: Timur Subject: Re: ehci-tegra issue with deep sleep Date: Thu, 03 Jan 2013 12:52:17 +0100 Message-ID: <50E570F1.4030706@riseup.net> References: <50C7B250.7020409@riseup.net> <50C8C47A.1080809@wwwdotorg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <50C8C47A.1080809-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Stephen Warren Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-tegra@vger.kernel.org On 12.12.2012 18:52, Stephen Warren wrote: > On 12/11/2012 03:23 PM, Timur wrote: >> Hi. I discovered a problem with USB host mode on a Nexus 7 running >> Android 4.2.x: > > Timur, > > This mailing list is intended for discussion of the mainline Linux > kernel, rather than NVIDIA's modified (and older) downstream kernel, as > used on shipping Android devices. > > Your best bet for support is to report the issue to > linux-tegra-bugs-DDmLM1+adcqXj1p+fO2waQ@public.gmane.org It may help if you've tried the Ubuntu/L4T > install described at: > > https://wiki.ubuntu.com/Nexus7 > > ... and reproduced the issue there too; at least some people working on > the downstream kernel do have access to Nexus 7s with that software setup. Hi Stephen, maybe you remember this brief conversation in December. I found the root cause of the reported issue (tegra specific) and I can provide a patch. The outcome is stable, externally powered USB host mode for Nexus 7. Do you happen to know anyone responsible for the Ubuntu Nexus7 kernel? I would like to contribute the fix, as I think it would be beneficial to that implementation. Thank you. Timur