ac100 team mailing list archive

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 08/20/2011 05:25 PM, Gordan Bobic wrote:
> On 08/20/2011 04:47 PM, Julian Andres Klode wrote:
> > On Sat, Aug 20, 2011 at 04:33:17PM +0100, Gordan Bobic wrote:
> > > On 08/20/2011 04:07 PM, Julian Andres Klode wrote:
> > > > On Sat, Aug 20, 2011 at 03:31:56PM +0100, Gordan Bobic wrote:
> > > > > Which kernel are you using?
> > > >
> > > > A somewhat older build of Marc's kernel (one month), the one
> > > > I have in my Debian repository + the change to use 1000 instead
> > > > of 1200.
> > >
> > > I presume you mean 1200mV rather than 1200MHz. If it's 1200MHz, I'd
> > > like to know where to tweak that. ;)
> >
> > I never said anything of Hz. It's all mV (if it's mV, what are 1.2V
> > used for? The voltage from the battery/charger is clearly 10-12V).
> >
> > > Well, my testing has been going on for 6+ hours. Considering I
> > > couldn't get an hour without errors before (and sometimes
> > > several/hour, and that's just the detected ones), I'd say it's a
> > > very definitive improvement. So much so that I'm vaguely tempted to
> > > try reducing it to 950mV. ;)
> >
> > Given that the minimum it currently scales to would be 725, 950
> > is certainly save.
>
> Seems there are limits in hardware. I built a kernel with the upper
> bound set to 900, and now I get a lot of this in the logs, while the CPU
> is stuck at 216MHz:
>
> Failed to set dvfs regulator vdd_cpu
> Failed to set regulator vdd_cpu for clock cpu to 875mV

^^^^^^^^^^^^^^^^
This should have read 975mV

> cpu-tegra: Failed to set cpu frequency to 1000000kHz
>
> over, and over and over.
>
> Seems 975mV may be the lower limit, going to try that next.
>
> Gordan
>
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