From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tobias Jakobi Subject: Re: Odroid U2 Kernel 4.7rc7+ Hang on reboot Date: Fri, 15 Jul 2016 15:15:23 +0200 Message-ID: <5788E1EB.4030003@math.uni-bielefeld.de> References: <1468525055.4843.4.camel@ndufresne.ca> <1468525558.4843.6.camel@ndufresne.ca> <5787EF8E.2010401@math.uni-bielefeld.de> <1468528408.4843.9.camel@ndufresne.ca> <578896DB.7060708@samsung.com> <5788CA67.5090200@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtp.math.uni-bielefeld.de ([129.70.45.10]:38896 "EHLO smtp.math.uni-bielefeld.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751161AbcGONPa (ORCPT ); Fri, 15 Jul 2016 09:15:30 -0400 In-Reply-To: <5788CA67.5090200@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org List-Id: linux-samsung-soc@vger.kernel.org To: Krzysztof Kozlowski , nicolas@ndufresne.ca, "linux-samsung-soc@vger.kernel.org" Cc: Javier Martinez Canillas Hey, Krzysztof Kozlowski wrote: > On 07/15/2016 09:55 AM, Krzysztof Kozlowski wrote: >>>> Nicolas Dufresne wrote: >>>>> Le jeudi 14 juillet 2016 =C3=A0 15:37 -0400, Nicolas Dufresne a =C3= =A9crit : >>>>>> Hi, >>>>>> >>>>>> I'm using the Odroid U2 to test some features implemented in >>>>>> GStreamer. >>>>>> The parts I need mostly works in mainline kernel, my main >>>>>> annoyance >>>>>> ist >>>>>> that reboot hangs. >>>>>> >>>>>> Is this issue known ? I'm booting from SD card is that matters. >>>>>> Any >>>>>> advise would be appreciated. I'm not list member, so please keep >>>>>> me >>>>>> in >>>>>> CC. I'm sharing my .config, in case that is my fault. >> >> First of all - use just command "reboot" to restart. It should work.= If >> it doesn't, please let us now. >> >> I was able to reproduce your issue - OOPS in emergency restart - als= o in >> my configuration (U3 + eMMC + network boot). >> >> It is weird... I'll take a look at it. >=20 > Actually I did not encounter OOPS of yours. I was able to reproduce a > failure to reboot on U3. XU3 reboots fine. It might be related to pwr= seq... I'm not sure how much that helps, but I can't reproduce any of this on my X2 (which is quite closely related to the U2/U3). I'm only encountering non-working reboot when applying Marek's latest IOMMU runpm patchset. > The failure seems to be present for long time, at least since v4.2. I= am > in progress of testing more releases. At least not for the X2, and I'm booting from a sdcard like Nicolas. IIRC then pwrseq only plays a role for booting from eMMC. > ext4 backtrace present in your OOPs might be related to improper rebo= ot. > Even for emergency reboot you should first sync, then remount ro and > finally reboot (so sysrq: sub). I currently don't have access to my UART adapater, but I'll try to reproduce the Oops by issuing a reboot SysRq directly. With best wishes, Tobias > Best Regards, > Krzysztof >=20