From mboxrd@z Thu Jan 1 00:00:00 1970 From: pavel@ucw.cz (Pavel Machek) Date: Wed, 8 Aug 2018 23:32:04 +0200 Subject: Droid 4: suspend to RAM? In-Reply-To: <20180808090512.GQ99251@atomide.com> References: <20180725200205.GA29594@amd> <20180725212853.GA1965@amd> <20180727113214.GA32069@amd> <20180808090512.GQ99251@atomide.com> Message-ID: <20180808213204.GD15831@amd> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed 2018-08-08 02:05:12, Tony Lindgren wrote: > * Pavel Machek [180727 11:35]: > > Hi! > > > > > high even before modem (and thus USB) is enabled. > > > > > > > > > > Interestingly, CyanogenMod and Jolla seem to have higher power > > > > > consumption than stock operating system. > > > > > > > > > > (My Linux can survive for 10 hours, stock system could survive for 4 > > > > > days if I'm not mistaken). > > > > > > > > > > I thought I would experiment with suspend to RAM.. and it indeed > > > > > seemed to suspend ok, but I could not wake it up. Do I need to set up > > > > > wakeup with button somehow? Is suspend to RAM required for good power > > > > > consumption? > > > > > > > > Sorry but pm subsystem has debug mode that you can test in a easy way. > > > > You can even wakeup by any rtc alarm easily. > > > > > > Yes, that is how it works on PC (but there power button works, > > > too). Is it expected to work on Droid in v4.18? > > > > I tried setting up wakeup using RTC, but no, it does not seem to work: > > > > root at devuan:/my/tui/d4# rtcwake -m no -s 5 > > rtcwake: wakeup using /dev/rtc0 at Fri Jul 27 11:28:44 2018 > > root at devuan:/my/tui/d4# echo mem > /sys/power/state > > Works for me here as tested on next-20180808, maybe you don't have > CONFIG_RTC_DRV_CPCAP? Maybe you are trying to use >CONFIG_RTC_DRV_OMAP? I tried with mainline... there will be no graphics in next, right? And yes, I had CONFIG_RTC_DRV_CPCAP and not CONFIG_RTC_DRV_OMAP. > Then for deeper idle modes, you need to also idle UARTs, and unbind or > unload USB related modules. You should get to something like 160mW > power consumption with mdm6600 enabled and SoC suspended that way. That's slightly interesting. echo mem > /sys/power/state should do all the work, right? Disable UARTs etc. Plus, is 160mW still a bit high? > Then again system running idle is about the same with timers and > interrupts working so I'd just idle UARTs and unload USB modules :) > > My UART idle script below for reference. Thanks, let me try... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: