From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Pisati Subject: Re: 3.1[34]: omap4: panda: hang on reboot? Date: Mon, 31 Mar 2014 23:56:59 +0200 Message-ID: <20140331215659.GA8214@luxor.wired.org> References: <20140327175414.GA5795@luxor.wired.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20140327175414.GA5795@luxor.wired.org> Sender: linux-omap-owner@vger.kernel.org To: Balaji T K , Chris Ball Cc: linux-mmc' , linux-omap List-Id: linux-mmc@vger.kernel.org On Thu, Mar 27, 2014 at 06:54:14PM +0100, Paolo Pisati wrote: > I've been experiencing hangs on reboot on two different panda boards (es rev1 > and vanilla rev a1) with v3.14-rc8 (but reproducible in 3.13 too): > > toolchanin: gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu7) > > the config is a multi_v7_defconfig plus a couple of codepages: > > http://people.canonical.com/~ppisati/omap4_reboot_hangs/config > > a prebuilt zImage is available here: > > http://people.canonical.com/~ppisati/omap4_reboot_hangs/zImage > > sometimes i can hit this two times in a row, others it's a bit less > frequent - put this into your crontab and let it go: > > */5 * * * * /bin/date >> /reboot.log && /sbin/reboot > > it never passed 2hrs of reboot cycles. > > I already tried different u-boots but that doesn't make any difference, > am i the only one experiencing this issue? i bisected it down to this commit: commit e002264f7e45d7661b237045577052fd0b40f89c Author: Balaji T K Date: Mon Oct 21 00:25:18 2013 +0530 mmc: omap_hsmmc: Fix pbias_disable for omap4 pbias_disable is set to protect the mmc pbias i/o cells in DT boot by preventing voltage switch. Currently pbias_disable is enabled only for omap3 and not for omap4 due to reg_offset difference of 0x100. Enable pbias_disable for omap4+ too by using res->start which does not include the reg_offset. Signed-off-by: Balaji T K Signed-off-by: Chris Ball with this commit reverted, i can reboot in a loop for hours without any problem, while if i keep this patch, my pandas don't survive more that two hours (again, it's really random as it could hang a couple of times in a row and then work like a charm for ten reboots straight). Any idea? does it ring any bell? -- bye, p.