RE: How to use the generic thermal sysfs.

Zhang Rui
2012-07-27T01:21:38Z

On 四, 2012-07-26 at 17:31 +0800, Wei Ni wrote:
> On Fri, 2012-07-13 at 15:41 +0800, Zhang Rui wrote:
> > On 五, 2012-07-13 at 15:30 +0800, Wei Ni wrote:
> > >
> > > Our tegra thermal framework also will use the generic thermal layer. It
> > > will register the cooling device, and run the throttling in this generic
> > > framework.
> > > But we have a special mechanism, when the temp is below the trip temp,
> > > we will set different cpu capability for different temp range. For
> > > example, set the low/high temp as 20C/30C to the sensor, and set the cpu
> > > to the max capability, it mean the cpu can run up to the max freq and
> > > voltage in this temp range. if the temp is out that range, the sensor
> > > will have irq/alert to notify the tegra framework, then we will set to
> > > another temperature range and cpu capability.
> > > I think we can try to add this mechanism to the generic framework as a
> > > new policy, right?
> > >
> > I think you can make use of the upper&lower limit in my patch set.
> > Say, here is your thermal policy
> > 20C - 30C, P0
> > 30C - 40C, P1 - P2
> > 40C - 60C, P3 - P5
> > 60C+, P6 ~ Pn
> >
> > you can register to the thermal layer 4 passive trip points,
> > 20C, 30C, 40C, 60C, and then
> > 1) for trip 0 (20C), upper limit 0, lower limit 0
> > 2) for trip 1 (30C), upper limit 2, lower limit 1
> > 3) for trip 2 (40C), upper limit 5, lower limit 3
> > 4) for trip 3 (60C), upper limit n, lower limit 6
> >
> > you can program your own sensor to get interrupt when the temperature
> > hits 20C/30C/40C/60C, and the generic thermal layer will put the
> > processors to proper frequency for each trip point.
> >
> > what do you think?
>
> Hi, Rui
> I'm trying your upper/lower codes on our tegra platform.
> Since we want to set limit value to the sensor to get interrupt, and
> many sensor drivers can support the limit alert property, could we add a
> new callback .set_limits() for the thermal zone device, so that we can
> program it in the generic layer. when the temperature hits the
> trip_temp,

at this time, there should be an interrupt, right?

> we can try to set to the next limit range.

is it possible to program the sensor at this time, in your own thermal
driver?

thanks,
rui
> I can try to add these codes base on your patches.
>
> Thanks.
> Wei.
>
> >
> > BTW, the upper and lower limit is introduced in the patch set I'm
> > testing, so maybe you were not aware of it.
> >
> > thanks,
> > rui
>
>
>