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Re: Nokia N900 retention mode in v4.6, camera buttons fun

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  Re: Nokia N900 retention mode in v4.6, camera buttons fun Pavel Machek <pavel@ucw.cz> - 2016-04-17 20:00 +0200
    Re: Nokia N900 retention mode in v4.6, camera buttons fun Tony Lindgren <tony@atomide.com> - 2016-04-19 01:50 +0200
    Re: Nokia N900 retention mode in v4.6, camera buttons fun Pali Rohár <pali.rohar@gmail.com> - 2016-04-21 15:10 +0200
      Re: Nokia N900 retention mode in v4.6, camera buttons fun Pavel Machek <pavel@ucw.cz> - 2016-04-21 23:30 +0200
        Re: Nokia N900 retention mode in v4.6, camera buttons fun Pali Rohár <pali.rohar@gmail.com> - 2016-04-22 09:10 +0200

#1380816 — Re: Nokia N900 retention mode in v4.6, camera buttons fun

Hi!

> > > > > Ok, it works now. I was doing tests in daylight so it was poorly
> > > > > visible. The right part of keyboard stays lit (but that's expected
> > > > > AFAICT), but the left part blinks.
> > > > 
> > > > During idle, both should go off and are doing so for me. Both LEDs off
> > > > indicates off mode, left LED off is for retention mode. So you still
> > > > have something blocking off mode, maybe check:
> > > > 
> > > > echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
> > > 
> > > What is the power difference between retention and off? I'm now down
> > > to cca 25mA, which should be around 50 hours standby time. Not ideal,
> > > but should be usable.
> 
> The 25mA sounds way too big to me even for retention mode, some
> devices must be still on.

Yes, cca 60mW. 

> The off mode makes a huge difference for standby time, it should cut
> down the total power consumption to something like 10+ mW with modem
> enabled. Aproximately the breakdown is roughly: 900 uW for omap, 5 mW
> for memory and 5 or more for the modem. Sorry I don't know the exact
> numbers for the modem. But with 37xx torpedo, mainline kernel is
> already getting very close to the 900 uW + 5 mW numbers for the CPU
> module during idle measured from the ina219 shunt on the torpedo
> devkit.

CONFIG_HSI breaks power management completely, so power management
with modem will be another topic.  

> > > 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.

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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#1382104

* Pavel Machek <pavel@ucw.cz> [160417 10:56]:
> > The off mode makes a huge difference for standby time, it should cut
> > down the total power consumption to something like 10+ mW with modem
> > enabled. Aproximately the breakdown is roughly: 900 uW for omap, 5 mW
> > for memory and 5 or more for the modem. Sorry I don't know the exact
> > numbers for the modem. But with 37xx torpedo, mainline kernel is
> > already getting very close to the 900 uW + 5 mW numbers for the CPU
> > module during idle measured from the ina219 shunt on the torpedo
> > devkit.
> 
> CONFIG_HSI breaks power management completely, so power management
> with modem will be another topic.  

OK

> > > > 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.

Ah I see yeah :)

Regards,

Tony

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#1384180

On Sunday 17 April 2016 19:55:40 Pavel Machek wrote:
> Hi!
> 
> > > > > > Ok, it works now. I was doing tests in daylight so it was poorly
> > > > > > visible. The right part of keyboard stays lit (but that's expected
> > > > > > AFAICT), but the left part blinks.
> > > > > 
> > > > > During idle, both should go off and are doing so for me. Both LEDs off
> > > > > indicates off mode, left LED off is for retention mode. So you still
> > > > > have something blocking off mode, maybe check:
> > > > > 
> > > > > echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
> > > > 
> > > > What is the power difference between retention and off? I'm now down
> > > > to cca 25mA, which should be around 50 hours standby time. Not ideal,
> > > > but should be usable.
> > 
> > The 25mA sounds way too big to me even for retention mode, some
> > devices must be still on.
> 
> Yes, cca 60mW. 
> 
> > The off mode makes a huge difference for standby time, it should cut
> > down the total power consumption to something like 10+ mW with modem
> > enabled. Aproximately the breakdown is roughly: 900 uW for omap, 5 mW
> > for memory and 5 or more for the modem. Sorry I don't know the exact
> > numbers for the modem. But with 37xx torpedo, mainline kernel is
> > already getting very close to the 900 uW + 5 mW numbers for the CPU
> > module during idle measured from the ina219 shunt on the torpedo
> > devkit.
> 
> 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?
Or problem is somewhere in CONFIG_PROVE_LOCKING?

-- 
Pali Rohár
pali.rohar@gmail.com

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#1384582

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

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#1384732

On Thursday 21 April 2016 23:28:08 Pavel Machek wrote:
> 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.

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.
> 
> 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
> 

Maybe down phonet0 interface and other hsi/ssi interfaces?

-- 
Pali Rohár
pali.rohar@gmail.com

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