Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753552AbcDUV2N (ORCPT ); Thu, 21 Apr 2016 17:28:13 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:42645 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753485AbcDUV2L (ORCPT ); Thu, 21 Apr 2016 17:28:11 -0400 Date: Thu, 21 Apr 2016 23:28:08 +0200 From: Pavel Machek To: Pali =?iso-8859-1?Q?Roh=E1r?= Cc: sre@kernel.org, Tony Lindgren , kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, khilman@kernel.org, aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com, patrikbachan@gmail.com, serge@hallyn.com, Tomi Valkeinen Subject: Re: Nokia N900 retention mode in v4.6, camera buttons fun Message-ID: <20160421212808.GA31979@amd> References: <20160407230150.GA16552@amd> <20160407234134.GQ16484@atomide.com> <20160411093023.GC11814@amd> <20160411094130.GA5753@amd> <20160411211026.GH5995@atomide.com> <20160412121658.GA32486@amd> <20160412123013.GA12296@amd> <20160412163055.GP5995@atomide.com> <20160417175539.GA502@amd> <20160421130450.GQ29406@pali> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160421130450.GQ29406@pali> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2297 Lines: 59 Hi! > > CONFIG_HSI breaks power management completely, so power management > > with modem will be another topic. > > Sebastian, any idea why power management does not work for HSI? > > > > > > In the meantime, I found what is causing the rention mode to break for > > > > > me: CONFIG_HSI (aka wireless modem support). With HSI off, it seems to work. > > > > > > > > > > I still get problems with the camera button, in config similar to > > > > > defconfig. For some reason, I'm even getting (autorepeating) ^@ on > > > > > console. As long as I hold camera button down, I even get it into off > > > > > mode for brief period. > > > > > > > > Ok, if I turn off CONFIG_KEYBOARD_GPIO, I get it into off > > > > mode... once per screen blank, for about a second. (Does CONFIG_KEYBOARD_GPIO also cause > > > > problems for you?) > > > > > > > > Any idea why it enters off mode only once after each screenblank? > > > > > > After disabling CONFIG_PROVE_LOCKING, loading the LCD modules, and > > > blanking the screen, my n900 hits off mode just fine about once > > > a second. Sounds like you still have some extra devices enabled > > > causing it. > > > > I checked again... also with vanilla 4.6-rc2 to double check... same effect. > > > > Aha, got it... cat-ing /sys/kernel/debug/pm_debug/count breaks the > > off mode. If I don't do that (tm), it seems to work way better. > > So what is result? Is power management working for CONFIG_KEYBOARD_GPIO? camera and unlock button GPIOs seem to break the powermanagement, too. I disabled it for now. Next hint I got from Sebastian was that I may need to enable power management in /sys. pavel@n900:/my/tui/ofone$ cat /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/runtime_status active pavel@n900:/my/tui/ofone$ cat /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/autosuspend_delay_ms cat: /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/autosuspend_delay_ms: Input/output error root@n900:/my/tui/ofone# cat /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/control auto I could not get it to sleep :-(. Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html