From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pali =?utf-8?B?Um9ow6Fy?= Subject: Re: Nokia N900 retention mode in v4.6, camera buttons fun Date: Fri, 22 Apr 2016 09:05:11 +0200 Message-ID: <20160422070511.GW29406@pali> References: <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> <20160421212808.GA31979@amd> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <20160421212808.GA31979@amd> Sender: linux-kernel-owner@vger.kernel.org To: Pavel Machek 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 List-Id: linux-omap@vger.kernel.org On Thursday 21 April 2016 23:28:08 Pavel Machek wrote: > Hi! >=20 > > > CONFIG_HSI breaks power management completely, so power managemen= t > > > with modem will be another topic. =20 > >=20 > > Sebastian, any idea why power management does not work for HSI? > >=20 > > > > > > In the meantime, I found what is causing the rention mode t= o break for > > > > > > me: CONFIG_HSI (aka wireless modem support). With HSI off, = it seems to work. > > > > > >=20 > > > > > > I still get problems with the camera button, in config simi= lar to > > > > > > defconfig. For some reason, I'm even getting (autorepeatin= g) ^@ on > > > > > > console. As long as I hold camera button down, I even get i= t into off > > > > > > mode for brief period. > > > > >=20 > > > > > Ok, if I turn off CONFIG_KEYBOARD_GPIO, I get it into off > > > > > mode... once per screen blank, for about a second. (Does CONF= IG_KEYBOARD_GPIO also cause > > > > > problems for you?) > > > > >=20 > > > > > Any idea why it enters off mode only once after each screenbl= ank? > > > >=20 > > > > 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. > > >=20 > > > I checked again... also with vanilla 4.6-rc2 to double check... s= ame effect. > > >=20 > > > Aha, got it... cat-ing /sys/kernel/debug/pm_debug/count breaks th= e > > > off mode. If I don't do that (tm), it seems to work way better. > >=20 > > So what is result? Is power management working for CONFIG_KEYBOARD_= GPIO? >=20 > camera and unlock button GPIOs seem to break the powermanagement, > too. I disabled it for now. So this sounds like a problem in gpio keyboard driver. Maybe you can ping maintainers of that driver? > Next hint I got from Sebastian was that I may need to enable power > management in /sys. >=20 > pavel@n900:/my/tui/ofone$ cat > /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/runt= ime_status > active > pavel@n900:/my/tui/ofone$ cat > /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/auto= suspend_delay_ms > cat: > /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/auto= suspend_delay_ms: > Input/output error > root@n900:/my/tui/ofone# cat > /sys/devices/platform/68000000.ocp/48058000.ssi-controller/power/cont= rol > auto >=20 > I could not get it to sleep :-(. >=20 > Best regards, > Pavel >=20 Maybe down phonet0 interface and other hsi/ssi interfaces? --=20 Pali Roh=C3=A1r pali.rohar@gmail.com