It seems I was looking at the correct source of instabilities, but
not with the correct solution.
incorrect cpu voltages were indeed causing the crashes but only
because the cpu regulator was missing the property
regulator-ramp-delay. The patch can be discarded, I'll post a new
that adds the missing properties on the regulators.
Philippe
On Fri, Nov 29, 2024 at 6:13 AM Chen-Yu Tsai <wens@xxxxxxxx> wrote:
>
> On Thu, Nov 28, 2024 at 11:46 PM Philippe Simons
> <simons.philippe@xxxxxxxxx> wrote:
> >
> > My H700 (RG35XX-H, RG40XX-V and RG CubeXX) devices are very unstable,
> > especially with some OPPs.
> > Crashes were fairly easy to reproduce with any dynamic cpufreq governor
> > and some load on CPU, usually in matter of minutes.
> > Crashes manifested randomly as simply hanging or various kernel oops
> >
> > Manufacturer (Anbernic) is using more conservative mircrovolt values,
> > so let's use these.
> > While using performance gov seems stables at 1.5Ghz, it still crashes
> > using a dynamic gov (even with Andre reparenting patch), so let's drop
> > it for now, like manufacturer does.
> >
> > Signed-off-by: Philippe Simons <simons.philippe@xxxxxxxxx
> > ---
> > .../dts/allwinner/sun50i-h616-cpu-opp.dtsi | 19 +++++++++----------
> > 1 file changed, 9 insertions(+), 10 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h616-cpu-opp.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h616-cpu-opp.dtsi
> > index dd10aaf47..ac13fe169 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-h616-cpu-opp.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h616-cpu-opp.dtsi
> > @@ -50,24 +50,21 @@ opp-1008000000 {
> > opp-microvolt-speed2 = <950000>;
> > opp-microvolt-speed3 = <950000>;
> > opp-microvolt-speed4 = <1020000>;
> > - opp-microvolt-speed5 = <900000>;
> > + opp-microvolt-speed5 = <950000>;
>
> It seems that you are encountering the issues on this particular binning.
> Could you mention that in the commit message?
>
> It's not very obvious that H700 == a particular speed bin of H616.
>
> ChenYu
>
> > clock-latency-ns = <244144>; /* 8 32k periods */
> > opp-supported-hw = <0x3f>;
> > };
> >
> > opp-1032000000 {
> > opp-hz = /bits/ 64 <1032000000>;
> > - opp-microvolt = <900000>;
> > + opp-microvolt = <950000>;
> > clock-latency-ns = <244144>; /* 8 32k periods */
> > opp-supported-hw = <0x20>;
> > };
> >
> > opp-1104000000 {
> > opp-hz = /bits/ 64 <1104000000>;
> > - opp-microvolt-speed0 = <1000000>;
> > - opp-microvolt-speed2 = <1000000>;
> > - opp-microvolt-speed3 = <1000000>;
> > - opp-microvolt-speed5 = <950000>;
> > + opp-microvolt = <1000000>;
> > clock-latency-ns = <244144>; /* 8 32k periods */
> > opp-supported-hw = <0x2d>;
> > };
> > @@ -79,7 +76,7 @@ opp-1200000000 {
> > opp-microvolt-speed2 = <1050000>;
> > opp-microvolt-speed3 = <1050000>;
> > opp-microvolt-speed4 = <1100000>;
> > - opp-microvolt-speed5 = <1020000>;
> > + opp-microvolt-speed5 = <1050000>;
> > clock-latency-ns = <244144>; /* 8 32k periods */
> > opp-supported-hw = <0x3f>;
> > };
> > @@ -93,7 +90,10 @@ opp-1320000000 {
> >
> > opp-1416000000 {
> > opp-hz = /bits/ 64 <1416000000>;
> > - opp-microvolt = <1100000>;
> > + opp-microvolt-speed0 = <1100000>;
> > + opp-microvolt-speed2 = <1100000>;
> > + opp-microvolt-speed3 = <1100000>;
> > + opp-microvolt-speed5 = <1160000>;
> > clock-latency-ns = <244144>; /* 8 32k periods */
> > opp-supported-hw = <0x2d>;
> > };
> > @@ -102,9 +102,8 @@ opp-1512000000 {
> > opp-hz = /bits/ 64 <1512000000>;
> > opp-microvolt-speed1 = <1100000>;
> > opp-microvolt-speed3 = <1100000>;
> > - opp-microvolt-speed5 = <1160000>;
> > clock-latency-ns = <244144>; /* 8 32k periods */
> > - opp-supported-hw = <0x2a>;
> > + opp-supported-hw = <0x0a>;
> > };
> > };
> > };
> > --
> > 2.46.1
> >
