Re: [PATCH v1] drivers: cpufreq: sun8i-r40: Add cpufreq support

[qianfan <qianfanguijin@xxxxxxx>]

在 2022/5/9 17:27, Maxime Ripard 写道:
> On Mon, May 09, 2022 at 04:48:53PM +0800, qianfanguijin@xxxxxxx wrote:
> > From: qianfan Zhao <qianfanguijin@xxxxxxx>
> >
> > OPP table value is get from allwinner lichee 3.10 kernel.
> >
> > Signed-off-by: qianfan Zhao <qianfanguijin@xxxxxxx>
> > ---
> >   arch/arm/boot/dts/sun8i-r40.dtsi     | 47 ++++++++++++++++++++++++++++
> >   drivers/cpufreq/cpufreq-dt-platdev.c |  1 +
> >   2 files changed, 48 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
> > index 291f4784e86c..90de119095fa 100644
> > --- a/arch/arm/boot/dts/sun8i-r40.dtsi
> > +++ b/arch/arm/boot/dts/sun8i-r40.dtsi
> > @@ -54,6 +54,41 @@ / {
> >   	#size-cells = <1>;
> >   	interrupt-parent = <&gic>;
> >   
> > +	cpu0_opp_table: opp_table0 {
> > +		compatible = "operating-points-v2";
> > +		opp-shared;
> > +
> > +		opp-720000000 {
> > +			opp-hz = /bits/ 64 <720000000>;
> > +			opp-microvolt = <1000000 1000000 1300000>;
> > +			clock-latency-ns = <2000000>;
> > +		};
> > +
> > +		opp-912000000 {
> > +			opp-hz = /bits/ 64 <912000000>;
> > +			opp-microvolt = <1100000 1100000 1300000>;
> > +			clock-latency-ns = <2000000>;
> > +		};
> > +
> > +		opp-1008000000 {
> > +			opp-hz = /bits/ 64 <1008000000>;
> > +			opp-microvolt = <1160000 1160000 1300000>;
> > +			clock-latency-ns = <2000000>;
> > +		};
> > +
> > +		opp-1104000000 {
> > +			opp-hz = /bits/ 64 <1104000000>;
> > +			opp-microvolt = <1240000 1240000 1300000>;
> > +			clock-latency-ns = <2000000>;
> > +		};
> > +
> > +		opp-1200000000 {
> > +			opp-hz = /bits/ 64 <1200000000>;
> > +			opp-microvolt = <1300000 1300000 1300000>;
> > +			clock-latency-ns = <2000000>;
> > +		};
> > +	};
> > +
> How were these OPPs tested? If you didn't, please test with
> https://github.com/ssvb/cpuburn-arm/blob/master/cpufreq-ljt-stress-test
Thanks for yours guide. Next it the log:
root@ubuntu:~/cpuburn-arm-master# ./cpufreq-ljt-stress-test
Creating './whitenoise-1920x1080.jpg' ... done
CPU stress test, which is doing JPEG decoding by libjpeg-turbo
at different cpufreq operating points.

Testing CPU 0
 1200 MHz ............................................................ OK
 1104 MHz ............................................................ OK
 1008 MHz ............................................................ OK
  912 MHz ............................................................ OK
  720 MHz ............................................................ OK

Testing CPU 1
 1200 MHz ............................................................ OK
 1104 MHz ............................................................ OK
 1008 MHz ............................................................ OK
  912 MHz ............................................................ OK
  720 MHz ............................................................ OK

Testing CPU 2
 1200 MHz ............................................................ OK
 1104 MHz ............................................................ OK
 1008 MHz ............................................................ OK
  912 MHz ............................................................ OK
  720 MHz ............................................................ OK

Testing CPU 3
 1200 MHz ............................................................ OK
 1104 MHz ............................................................ OK
 1008 MHz ............................................................ OK
  912 MHz ............................................................ OK
  720 MHz ............................................................ OK

Overall result : PASSED
> And report the results
>
> Also, U-Boot sets the 1008MHz OPP by default, and the voltage to match.
> How is this going to play out on device tree where the CPU regulators
> aren't set?
I tested this patch on my custom board now, and cpu is powered by dcdc2.
So I add cpu-supply in dts on my custom board:

&cpu0 {
    cpu-supply = <&reg_dcdc2>;
};

I think I can add cpu-supply to the others.
> Maxime