arm64: dts: meson: S922X: extend cpu opp-points

Add extra cpu pop points to allow mild overclock on S922X. The opp points are found in Hardkernel N2 sources [1] and testing shows no obvious issues on other S922X devices. Thermal throttling should keep things in-check if needed.

[1] https://github.com/hardkernel/linux/commit/f86cd9487c7483b2a05f448b9ebacf6bd5a2ad2f

Tested-by Christian Hewitt <[email protected]>

Reviewed-by Neil Armstrong <[email protected]>

Signed-off-by Tim Lewis <[email protected]>

---
 arch/arm64/boot/dts/amlogic/meson-g12b-s922x.dtsi | 15 +++++++++++++++
 1 files changed, 15 insertions(+)

arch/arm64/boot/dts/amlogic/meson-g12b-s922x.dtsi +15 -0

index 046cc332d..1e5d0ee5d 100644
@@ -65,6 +65,11 @@
 			opp-hz = /bits/ 64 <1896000000>;
 			opp-microvolt = <981000>;
 		};
+
+		opp-1992000000 {
+			opp-hz = /bits/ 64 <1992000000>;
+			opp-microvolt = <1001000>;
+		};
 	};
 
 	cpub_opp_table_1: opp-table-1 {

@@ -120,5 +125,15 @@
 			opp-hz = /bits/ 64 <1704000000>;
 			opp-microvolt = <891000>;
 		};
+
+		opp-1800000000 {
+			opp-hz = /bits/ 64 <1800000000>;
+			opp-microvolt = <981000>;
+		};
+
+		opp-1908000000 {
+			opp-hz = /bits/ 64 <1908000000>;
+			opp-microvolt = <1022000>;
+		};
 	};
 };

Quoted 4 lines · Tim Lewis

Add extra cpu pop points to allow mild overclock on S922X. The opp points are found in Hardkernel N2 sources [1] and testing shows no obvious issues on other S922X devices. Thermal throttling should keep things in-check if needed.

The Odroid-N2 has a massive heatsink mounted.
Do we have any idea if this applies (is safe) on any other S922x device ?

Quoted 12 lines · Jerome Brunet

Quoted 4 lines · Tim Lewis

Add extra cpu pop points to allow mild overclock on S922X. The opp points are found in Hardkernel N2 sources [1] and testing shows no obvious issues on other S922X devices. Thermal throttling should keep things in-check if needed.

The Odroid-N2 has a massive heatsink mounted.
Do we have any idea if this applies (is safe) on any other S922x device ?

I’ve tested it on several S922X box devices that I have, and also the original S922X version of the VIM3 - all have similar sized passive heatsinks about 20% the size of the N2 one. No obvious issues with Kodi software decoding to increase CPU usage. NB: The original patch submission was N2 specific and then reworked to apply to all S922X devices at Neil’s suggestion (after my TB and earlier comments).