arm64: dts: rockchip: Update GPU OPP voltages in RK356x SoC dtsi

Update the values for the exact Rockchip RK356x GPU OPP voltages and the
lower limits for the GPU OPP voltage ranges, using the most conservative
values (i.e. the highest per-OPP voltages) found in the vendor kernel source
(cf. downstream commit f8b9431ee38e ("arm64: dts: rockchip: rk3568: support
adjust opp-table by otp")). [1][2]

Using the most conservative per-OPP voltages ensures reliable GPU operation
regardless of the actual GPU binning, with the downside of possibly using
a bit more power than absolutely needed.

[1] https://github.com/rockchip-linux/kernel/commit/f8b9431ee38ed561650be7092ab93f564598daa9
[2] https://raw.githubusercontent.com/rockchip-linux/kernel/f8b9431ee38ed561650be7092ab93f564598daa9/arch/arm64/boot/dts/rockchip/rk3568.dtsi

Suggested-by: Diederik de Haas <didi.debian@cknow.org>
Helped-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/80301764e8983c8410c806ed2256403823709897.1719763100.git.dsimic@manjaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
index 7102919408563ca41087cdbe1cf1b3fc434f6e24..4690be841a1cd8e3ebf60ec435d4b68c4af15dc8 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
@@ -195,27 +195,27 @@
 
                opp-200000000 {
                        opp-hz = /bits/ 64 <200000000>;
-                       opp-microvolt = <825000 825000 1000000>;
+                       opp-microvolt = <850000 850000 1000000>;
                };
 
                opp-300000000 {
                        opp-hz = /bits/ 64 <300000000>;
-                       opp-microvolt = <825000 825000 1000000>;
+                       opp-microvolt = <850000 850000 1000000>;
                };
 
                opp-400000000 {
                        opp-hz = /bits/ 64 <400000000>;
-                       opp-microvolt = <825000 825000 1000000>;
+                       opp-microvolt = <850000 850000 1000000>;
                };
 
                opp-600000000 {
                        opp-hz = /bits/ 64 <600000000>;
-                       opp-microvolt = <825000 825000 1000000>;
+                       opp-microvolt = <900000 900000 1000000>;
                };
 
                opp-700000000 {
                        opp-hz = /bits/ 64 <700000000>;
-                       opp-microvolt = <900000 900000 1000000>;
+                       opp-microvolt = <950000 950000 1000000>;
                };
 
                opp-800000000 {