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Set an appropriate limit on the maximum scaling > frequency. Looking at downstream, from what I can tell, the CPU's maximum frequency is= indeed 1.55GHz under normal conditions. However, at temperatures over 90C,= its voltage is limited to 1090mV. Reference: static struct dvfs_therm_limits tegra210_core_therm_caps_ucm2[MAX_THERMAL_LIMITS] =3D { {86, 1090}, {0, 0}, }; (rel-32 kernel-4.9/drivers/soc/tegra/tegra210-dvfs.c) Here the throttling is set at 86C, I suppose to give some margin. 1090mV perfectly matches the 1.479GHz operating point defined in the upstre= am kernel. So it seems to me that rather than setting a maximum frequency, = we would need temperature dependent DVFS. Or, at least as a first step, we = could have the driver just always limit the maximum frequency so it fits un= der the thermal cap voltage -- the temperature limit is rather high, after = all. If you have other information, please do tell. Incidentally, some of the CVB tables in the upstream kernel seem to ignore = speedo (I assume they are conservative) while rel-32 has different tables. = So the upstream kernel is probably running at slightly unnecessarily high v= oltages. Cheers, Mikko >=20 > Signed-off-by: Aaron Kling > --- > arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts | 1 + > 1 file changed, 1 insertion(+) >=20 > diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts b/arch/ar= m64/boot/dts/nvidia/tegra210-p3450-0000.dts > index ec0e84cb83ef9bf8f0e52e2958db33666813917c..10f878d3f50815d1f0297d156= 69048ab9cad73ee 100644 > --- a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts > +++ b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts > @@ -594,6 +594,7 @@ clock@70110000 { > nvidia,droop-ctrl =3D <0x00000f00>; > nvidia,force-mode =3D <1>; > nvidia,sample-rate =3D <25000>; > + nvidia,dfll-max-freq =3D <1479000000>; > =20 > nvidia,pwm-min-microvolts =3D <708000>; > nvidia,pwm-period-nanoseconds =3D <2500>; /* 2.5us */ >=20 >=20