On 14/09/2019 04:49, Christian Hewitt wrote: > From: Frank Hartung <supervisedthinking@xxxxxxxxx> > > From: Frank Hartung <supervisedthinking@xxxxxxxxx> > > Meson G12B SoCs (S922X and A311D) are a big-little design where not all CPUs > are equal; the A53s cores are weaker than the A72s. > > Include capacity-dmips-mhz properties to tell the OS there is a difference > in processing capacity. The dmips values are based on similar submissions for > other A53/A72 SoCs: HiSilicon 3660 [1] and Rockchip RK3399 [2]. > > This change is particularly beneficial for use-cases like retro gaming where > emulators often run on a single core. The OS now chooses an A72 core instead > of an A53 core. > > [1] https://lore.kernel.org/patchwork/patch/862742/ > [2] https://patchwork.kernel.org/patch/10836577/ > > Signed-off-by: Frank Hartung <supervisedthinking@xxxxxxxxx> > Signed-off-by: Christian Hewitt <christianshewitt@xxxxxxxxx> > --- > arch/arm64/boot/dts/amlogic/meson-g12b.dtsi | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12b.dtsi > index 5628ccd..7f78d88 100644 > --- a/arch/arm64/boot/dts/amlogic/meson-g12b.dtsi > +++ b/arch/arm64/boot/dts/amlogic/meson-g12b.dtsi > @@ -49,6 +49,7 @@ > compatible = "arm,cortex-a53"; > reg = <0x0 0x0>; > enable-method = "psci"; > + capacity-dmips-mhz = <592>; > next-level-cache = <&l2>; > }; > > @@ -57,6 +58,7 @@ > compatible = "arm,cortex-a53"; > reg = <0x0 0x1>; > enable-method = "psci"; > + capacity-dmips-mhz = <592>; > next-level-cache = <&l2>; > }; > > @@ -65,6 +67,7 @@ > compatible = "arm,cortex-a73"; > reg = <0x0 0x100>; > enable-method = "psci"; > + capacity-dmips-mhz = <1024>; > next-level-cache = <&l2>; > }; > > @@ -73,6 +76,7 @@ > compatible = "arm,cortex-a73"; > reg = <0x0 0x101>; > enable-method = "psci"; > + capacity-dmips-mhz = <1024>; > next-level-cache = <&l2>; > }; > > @@ -81,6 +85,7 @@ > compatible = "arm,cortex-a73"; > reg = <0x0 0x102>; > enable-method = "psci"; > + capacity-dmips-mhz = <1024>; > next-level-cache = <&l2>; > }; > > @@ -89,6 +94,7 @@ > compatible = "arm,cortex-a73"; > reg = <0x0 0x103>; > enable-method = "psci"; > + capacity-dmips-mhz = <1024>; > next-level-cache = <&l2>; > }; > > Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
