Re: [RFC v1 3/5] arm64: dts: amlogic: meson-gx: add the Mali-450 OPP table and use DVFS

From: Neil Armstrong
Date: Tue Mar 31 2020 - 03:45:02 EST

Hi,

On 31/03/2020 00:11, Martin Blumenstingl wrote:
> Add the OPP table for the Mali-450 GPU and drop the hardcoded initial
> clock configuration. This enables GPU DVFS and thus saves power when the
> GPU is not in use while still being able switch to a higher clock on
> demand.
>
> While here, make most of meson-gxl-mali re-usable to reduce the amount
> of duplicate code between GXBB and GXL. This is more important now as we
> don't want to duplicate the GPU OPP table.

Looks good, but please add comment about the CLKID_GP0_PLL assigned clock rate.

I'll ask LibreELEC people to have a run on these patches (including the clk changes) with Kodi.

Neil

>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
> ---
> .../boot/dts/amlogic/meson-gx-mali450.dtsi | 61 +++++++++++++++++++
> arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 51 ++++------------
> .../boot/dts/amlogic/meson-gxl-mali.dtsi | 46 +++-----------
> 3 files changed, 81 insertions(+), 77 deletions(-)
> create mode 100644 arch/arm64/boot/dts/amlogic/meson-gx-mali450.dtsi
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gx-mali450.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx-mali450.dtsi
> new file mode 100644
> index 000000000000..f9771b51c852
> --- /dev/null
> +++ b/arch/arm64/boot/dts/amlogic/meson-gx-mali450.dtsi
> @@ -0,0 +1,61 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2017 BayLibre SAS
> + * Author: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> + */
> +
> +/ {
> + gpu_opp_table: opp-table {
> + compatible = "operating-points-v2";
> +
> + opp-125000000 {
> + opp-hz = /bits/ 64 <125000000>;
> + opp-microvolt = <950000>;
> + };
> + opp-250000000 {
> + opp-hz = /bits/ 64 <250000000>;
> + opp-microvolt = <950000>;
> + };
> + opp-285714285 {
> + opp-hz = /bits/ 64 <285714285>;
> + opp-microvolt = <950000>;
> + };
> + opp-400000000 {
> + opp-hz = /bits/ 64 <400000000>;
> + opp-microvolt = <950000>;
> + };
> + opp-500000000 {
> + opp-hz = /bits/ 64 <500000000>;
> + opp-microvolt = <950000>;
> + };
> + opp-666666666 {
> + opp-hz = /bits/ 64 <666666666>;
> + opp-microvolt = <950000>;
> + };
> + opp-744000000 {
> + opp-hz = /bits/ 64 <744000000>;
> + opp-microvolt = <950000>;
> + };
> + };
> +};
> +
> +&apb {
> + mali: gpu@c0000 {
> + compatible = "arm,mali-450";
> + reg = <0x0 0xc0000 0x0 0x40000>;
> + interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-names = "gp", "gpmmu", "pp", "pmu",
> + "pp0", "ppmmu0", "pp1", "ppmmu1",
> + "pp2", "ppmmu2";
> + operating-points-v2 = <&gpu_opp_table>;
> + };
> +};
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> index 0cb40326b0d3..e43b330129c7 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
> @@ -4,6 +4,7 @@
> */
>
> #include "meson-gx.dtsi"
> +#include "meson-gx-mali450.dtsi"
> #include <dt-bindings/gpio/meson-gxbb-gpio.h>
> #include <dt-bindings/reset/amlogic,meson-gxbb-reset.h>
> #include <dt-bindings/clock/gxbb-clkc.h>
> @@ -241,46 +242,6 @@ mux {
> };
> };
>
> -&apb {
> - mali: gpu@c0000 {
> - compatible = "amlogic,meson-gxbb-mali", "arm,mali-450";
> - reg = <0x0 0xc0000 0x0 0x40000>;
> - interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>;
> - interrupt-names = "gp", "gpmmu", "pp", "pmu",
> - "pp0", "ppmmu0", "pp1", "ppmmu1",
> - "pp2", "ppmmu2";
> - clocks = <&clkc CLKID_CLK81>, <&clkc CLKID_MALI>;
> - clock-names = "bus", "core";
> -
> - /*
> - * Mali clocking is provided by two identical clock paths
> - * MALI_0 and MALI_1 muxed to a single clock by a glitch
> - * free mux to safely change frequency while running.
> - */
> - assigned-clocks = <&clkc CLKID_GP0_PLL>,
> - <&clkc CLKID_MALI_0_SEL>,
> - <&clkc CLKID_MALI_0>,
> - <&clkc CLKID_MALI>; /* Glitch free mux */
> - assigned-clock-parents = <0>, /* Do Nothing */
> - <&clkc CLKID_GP0_PLL>,
> - <0>, /* Do Nothing */
> - <&clkc CLKID_MALI_0>;
> - assigned-clock-rates = <744000000>,
> - <0>, /* Do Nothing */
> - <744000000>,
> - <0>; /* Do Nothing */
> - };
> -};
> -
> &cbus {
> spifc: spi@8c80 {
> compatible = "amlogic,meson-gxbb-spifc";
> @@ -362,6 +323,16 @@ &i2c_C {
> clocks = <&clkc CLKID_I2C>;
> };
>
> +&mali {
> + compatible = "amlogic,meson-gxbb-mali", "arm,mali-450";
> +
> + clocks = <&clkc CLKID_CLK81>, <&clkc CLKID_MALI>;
> + clock-names = "bus", "core";
> +
> + assigned-clocks = <&clkc CLKID_GP0_PLL>;
> + assigned-clock-rates = <744000000>;
> +};
> +
> &periphs {
> pinctrl_periphs: pinctrl@4b0 {
> compatible = "amlogic,meson-gxbb-periphs-pinctrl";
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl-mali.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl-mali.dtsi
> index 6aaafff674f9..478e755cc87c 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxl-mali.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxl-mali.dtsi
> @@ -4,42 +4,14 @@
> * Author: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> */
>
> -&apb {
> - mali: gpu@c0000 {
> - compatible = "amlogic,meson-gxl-mali", "arm,mali-450";
> - reg = <0x0 0xc0000 0x0 0x40000>;
> - interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>,
> - <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>;
> - interrupt-names = "gp", "gpmmu", "pp", "pmu",
> - "pp0", "ppmmu0", "pp1", "ppmmu1",
> - "pp2", "ppmmu2";
> - clocks = <&clkc CLKID_CLK81>, <&clkc CLKID_MALI>;
> - clock-names = "bus", "core";
> +#include "meson-gx-mali450.dtsi"
>
> - /*
> - * Mali clocking is provided by two identical clock paths
> - * MALI_0 and MALI_1 muxed to a single clock by a glitch
> - * free mux to safely change frequency while running.
> - */
> - assigned-clocks = <&clkc CLKID_GP0_PLL>,
> - <&clkc CLKID_MALI_0_SEL>,
> - <&clkc CLKID_MALI_0>,
> - <&clkc CLKID_MALI>; /* Glitch free mux */
> - assigned-clock-parents = <0>, /* Do Nothing */
> - <&clkc CLKID_GP0_PLL>,
> - <0>, /* Do Nothing */
> - <&clkc CLKID_MALI_0>;
> - assigned-clock-rates = <744000000>,
> - <0>, /* Do Nothing */
> - <744000000>,
> - <0>; /* Do Nothing */
> - };
> +&mali {
> + compatible = "amlogic,meson-gxl-mali", "arm,mali-450";
> +
> + clocks = <&clkc CLKID_CLK81>, <&clkc CLKID_MALI>;
> + clock-names = "bus", "core";
> +
> + assigned-clocks = <&clkc CLKID_GP0_PLL>;
> + assigned-clock-rates = <744000000>;
> };
>