Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[Maximilian Schwerin]

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Hi,

I've just built a linux-omap kernel at 3.6-rc6 using omap2plus_defconfig
as basis for the kernel config.

When I enable smartreflex and switch to 800MHz via

echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
cpufreq-set -f 800MHz

the board crashes. If I switch to 800MHz and enable smartreflex later
nothing happens. This used to work in my 3.3 based kernel.

Regards, Maximilian

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Re: Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[Joni Lapilainen]

On Fri, Sep 21, 2012 at 9:45 AM, Maximilian Schwerin
<Maximilian.Schwerin@tigris.de> wrote:
> Hi,
>
> I've just built a linux-omap kernel at 3.6-rc6 using omap2plus_defconfig
> as basis for the kernel config.
>
> When I enable smartreflex and switch to 800MHz via
>
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
> cpufreq-set -f 800MHz
>
> the board crashes. If I switch to 800MHz and enable smartreflex later
> nothing happens. This used to work in my 3.3 based kernel.
>
> Regards, Maximilian

Also happens with N900 when changing frequency.

-JL

Re: Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[Robert Nelson]

On Fri, Sep 21, 2012 at 1:45 AM, Maximilian Schwerin
<Maximilian.Schwerin@tigris.de> wrote:
> Hi,
>
> I've just built a linux-omap kernel at 3.6-rc6 using omap2plus_defconfig
> as basis for the kernel config.
>
> When I enable smartreflex and switch to 800MHz via
>
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
> cpufreq-set -f 800MHz
>
> the board crashes. If I switch to 800MHz and enable smartreflex later
> nothing happens. This used to work in my 3.3 based kernel.

btw, once it locks up... retry with your 3.3 based kernel (hold reset
and swap sd card's, the "bug" should lock up again when trying to set
800Mhz on bootup..  In my testing, once it locks up, any cpufreq
enabled kernel will keep locking up...  Makes you wonder if a pll
setting isn't getting reset on bootup...)

I've traced it to the "arch_clock->clk_set_rate(clk, rate);" call in
the "int clk_set_rate(struct clk *clk, unsigned long rate)" function

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=arch/arm/plat-omap/clock.c;hb=HEAD#l132

at that point, I'm a little lost in the omap36xx code..

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/

Re: Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[Tony Lindgren]

* Maximilian Schwerin <Maximilian.Schwerin@tigris.de> [120920 23:46]:
> Hi,
> 
> I've just built a linux-omap kernel at 3.6-rc6 using omap2plus_defconfig
> as basis for the kernel config.
> 
> When I enable smartreflex and switch to 800MHz via
> 
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
> cpufreq-set -f 800MHz
> 
> the board crashes. If I switch to 800MHz and enable smartreflex later
> nothing happens. This used to work in my 3.3 based kernel.

I'm suspecting that this is because of all the missing PM
errata we don't have in the mainline kernel :(

I think we're missing at least the following based on a quick grep
of the Nokia patched PM code:

- 3430 (and 3630?) hs omap cs1 off-idle bug where save/restore needs to be in lowmem

- 3630 retention idle is missing errata handling for 1.85/i581

- 3630 off idle is missing 1.87 handling

- smartreflex missing twl4030 errata?

- Nokia patched PM code mentions also quite a few other missing
  errata such as 1.88, 1.142, i582, i467, i468, 1.164

This may be a bit out of date as it's based on some notes I made
few months ago after I started noticing flakeyness on my 3630 zoom3
board.

Regards,

Tony

Re: Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[Kevin Hilman]

"Maximilian Schwerin" <Maximilian.Schwerin@tigris.de> writes:

> Hi,
>
> I've just built a linux-omap kernel at 3.6-rc6 using omap2plus_defconfig
> as basis for the kernel config.
>
> When I enable smartreflex and switch to 800MHz via
>
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
> cpufreq-set -f 800MHz
>
> the board crashes. If I switch to 800MHz and enable smartreflex later
> nothing happens. This used to work in my 3.3 based kernel.

SmartReflex is kwown to be unstable in mainline and there are several
errata that still need fixing for it to be stable.

I strongly recommend you simply leave SR disabled.

Kevin

AW: Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[Maximilian Schwerin]

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> -----Ursprüngliche Nachricht-----
> Von: Kevin Hilman [mailto:khilman@deeprootsystems.com] 
> Gesendet: Dienstag, 2. Oktober 2012 02:00
> An: Maximilian Schwerin
> Cc: linux-omap@vger.kernel.org
> Betreff: Re: Beagleboard xM crashes when being set to 800MHz 
> with smartreflex on linux-omap-3.6-rc6
> 
> "Maximilian Schwerin" <Maximilian.Schwerin@tigris.de> writes:
> 
> > Hi,
> >
> > I've just built a linux-omap kernel at 3.6-rc6 using 
> omap2plus_defconfig
> > as basis for the kernel config.
> >
> > When I enable smartreflex and switch to 800MHz via
> >
> > echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
> > echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
> > cpufreq-set -f 800MHz
> >
> > the board crashes. If I switch to 800MHz and enable 
> smartreflex later
> > nothing happens. This used to work in my 3.3 based kernel.
> 
> SmartReflex is kwown to be unstable in mainline and there are several
> errata that still need fixing for it to be stable.
> 
> I strongly recommend you simply leave SR disabled.
> 
> Kevin
> 

So what does this mean for 800MHz and 1GHz? Is this not usable at all? Is there another kernel branch, that supports both frequencies? My customer needs 800MHz and 1GHz.

Cheers, m. 

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Re: Beagleboard xM crashes when being set to 800MHz with smartreflex on linux-omap-3.6-rc6

[jean-philippe francois]

2012/10/2 Kevin Hilman <khilman@deeprootsystems.com>:
> "Maximilian Schwerin" <Maximilian.Schwerin@tigris.de> writes:
>
>> Hi,
>>
>> I've just built a linux-omap kernel at 3.6-rc6 using omap2plus_defconfig
>> as basis for the kernel config.
>>
>> When I enable smartreflex and switch to 800MHz via
>>
>> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_core/autocomp
>> echo 1 > /sys/kernel/debug/smartreflex/smartreflex_mpu_iva/autocomp
>> cpufreq-set -f 800MHz
>>
>> the board crashes. If I switch to 800MHz and enable smartreflex later
>> nothing happens. This used to work in my 3.3 based kernel.
>
> SmartReflex is kwown to be unstable in mainline and there are several
> errata that still need fixing for it to be stable.
>
> I strongly recommend you simply leave SR disabled.
>
Does it apply to a device always at opp1G ?
Ie if I boot @1GHz and then enable smart reflex, is it ok ?

> Kevin
>
>
> --
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