linux-kernel - Re: Droid 4: poweroff does not work? calls

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Date:   Sun, 9 Dec 2018 18:24:04 +0100
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, sre@...nel.org, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org
Subject: Re: Droid 4: poweroff does not work? calls

On Sun 2018-12-09 08:46:50, Tony Lindgren wrote:
> * Pavel Machek <pavel@....cz> [181209 12:13]:
> > Hi!
> > 
> > Poweroff does not seem to work on Motorola droid 4 -- it reboots. It
> > seems to be problem "forever", 4.18 and 4.20-rc5 seem to be
> > affected. It is bad, because when your battery is low, you get into
> > reboot loop and discharge it furher, which batteries do not like.
> > 
> > Any ideas, or at least idea how to debug this?
> 
> Hmm can you check if this is happening with usb unloaded or
> unbind? I suspect ohci or musb..

Ok, let me try: musb unbound, v4.20:

root@...uan:/sys/devices/platform/44000000.ocp/4a0ab000.usb_otg_hs#
echo 4a0ab000.usb_otg_hs > driver/unbind

(I hope I did not pull the USB too late). It rebooted instead of
poweroff. Now on 4.18:

root@...uan:/sys/devices/platform/44000000.ocp/4a062000.usbhstll# echo
4a062000.usbhstll > driver/unbind
root@...uan:/sys/devices/platform/44000000.ocp/4a062000.usbhstll#
uname -a
Linux devuan 4.18.0-rc4-88970-gf075a2c-dirty #764 SMP Mon Jul 9
12:51:47 CEST 2018 armv7l GNU/Linux

I get nice oops doing that:

[  170.705383] ------------[ cut here ]------------
[  170.710235] WARNING: CPU: 0 PID: 2371 at drivers/clk/clk.c:697
clk_core_unpre
pare+0xcc/0xec
[  170.718749] Unpreparing enabled l3_init_cm:clk:0048:8
[  170.723968] Modules linked in:

root@...uan:/sys/devices/platform/44000000.ocp/4a064000.usbhshost/4a064800.ohci#
echo 4a064800.ohci > driver/unbind

..Hmm. I'm not sure how to unbind ehci. Let me try sudo
poweroff... no, it reboots, too.

Can you check if it works for you?

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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